Preheating control method and device for oil pool of heat pump system and heat pump equipment

Abstract

The invention provides a heat pump system oil pool preheating control method and device and heat pump equipment.The heat pump system oil pool preheating control method comprises the steps that after a heat pump unit is standby, the environment temperature of the environment where the heat pump unit is located and the oil pool temperature of a compressor oil pool of the heat pump unit are periodically obtained; the first temperature change rate of the environment temperature and the second temperature change rate of the oil pool temperature are calculated, and the preheating starting temperature for starting compressor oil pool preheating is calculated according to the first temperature change rate and the second temperature change rate; whether the oil pool temperature reaches the preheating starting temperature or not is judged, whether the compressor oil pool is preheated or not is controlled according to the judgment result, the technical problem that when the heat pump system is in the standby state, continuous heating energy consumption of a compressor oil pool preheating device is too much is solved, starting power consumption of the compressor oil pool preheating control device in the standby period is greatly reduced, and the heating efficiency is improved. Reliable operation of the compressor is further guaranteed, and continuous heating consumption of continuous preheating in the standby time period of the heat pump unit is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump system oil pool preheating control, and in particular to a heat pump system oil pool preheating control method and device, and heat pump equipment. Background Art

[0002] After the heat pump system is placed in a low-temperature environment, the refrigerant migrates to the low-temperature components, especially the compressor components, and partially dissolves with the lubricating oil, causing the lubricating oil to be diluted. At the same time, the viscosity of the lubricating oil increases at low temperatures, which makes it easy for the compressor to have poor lubrication at the friction points of the running parts when it is started again, increasing operating power consumption and even causing abnormalities such as jamming.

[0003] At present, the commonly used control is to judge the ambient temperature after the heat pump unit is in standby mode. When the ambient temperature is lower than a certain level, the electric heating belt or the compressor motor winding is turned on to preheat the compressor oil pool, so as to promote the volatilization of the refrigerant that has migrated to the compressor, increase the concentration of the lubricating oil, and avoid damage to the compressor caused by lubrication failure. However, continuous heating based on the ambient temperature will cause excessive power consumption, so that the compressor oil pool preheating device of the heat pump system will continue to heat and consume too much energy when in standby mode, resulting in energy waste.

[0004] Therefore, the prior art needs to be further developed. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and provide a heat pump system oil pool preheating control method and device, and heat pump equipment to solve the current technical problem that continuous heating of the compressor oil pool according to the ambient temperature will cause excessive power consumption, thereby causing the compressor oil pool preheating device of the heat pump system to continue heating in the standby state and consume too much energy, resulting in energy waste.

[0006] To achieve the above technical objectives, according to a first aspect of the present invention, the present invention provides a heat pump system oil pool preheating control method, comprising:

[0007] S100, after the heat pump unit is in standby mode, periodically obtain the ambient temperature of the environment in which the heat pump unit is located and the oil pool temperature of the compressor oil pool of the heat pump unit;

[0008] S200, calculating a first temperature change rate of the ambient temperature and a second temperature change rate of the oil pool temperature, and calculating a preheating start temperature for starting compressor oil pool preheating according to the first temperature change rate and the second temperature change rate;

[0009] S300, determining whether the oil pool temperature reaches the preheating start temperature, and controlling whether to preheat the compressor oil pool according to the determination result.

[0010] Specifically, the first temperature change rate is a first temperature drop rate at which the ambient temperature drops after the heat pump unit has been on standby for a first preset time;

[0011] The second temperature change rate includes a second temperature drop rate and a first temperature rise rate;

[0012] The second temperature drop rate is the rate at which the compressor oil pool drops from the temperature after the first preset standby time to the preheating start temperature;

[0013] The first heating rate is a rate at which the temperature of the compressor oil pool rises from a preheating start temperature to a preheating cut-off temperature.

[0014] Specifically, the calculation of the preheating start temperature for starting the compressor oil pool preheating according to the first temperature change rate and the second temperature change rate includes:

[0015] According to the first cooling rate, a first cooling time is calculated for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the startup state after the ambient temperature of the heat pump unit has been on standby for a first preset time;

[0016] According to the second cooling rate, a second cooling time is calculated for the compressor oil pool temperature to drop to the preheating start temperature when the compressor oil pool is preheated after the heat pump unit has been on standby for the first preset time;

[0017] Calculating a first heating time for the compressor oil pool to rise from a preheating start temperature to a preheating cut-off temperature according to the first heating rate;

[0018] The preheating start temperature is calculated according to the first temperature drop time, the second temperature drop time, and the first temperature rise time.

[0019] Specifically, the first cooling rate is used to calculate the first cooling time for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the startup state after the ambient temperature of the heat pump unit has been on standby for the first preset time, including:

[0020] The first set value T of the ambient temperature for making the heat pump unit enter the standby state is preset 设定 , and the difference ΔT of the ambient temperature from the standby state to the startup state of the heat pump unit, according to the first set value T 设定 The difference between the ambient temperature and the ambient temperature ΔT is used to calculate the ambient temperature T2 when the compressor oil pool enters the startup state. The specific calculation formula is as follows:

[0021] T2=T 设定 -ΔT.

[0022] Specifically, the first cooling time for calculating, according to the first cooling rate, the ambient temperature after the heat pump unit has been on standby for a first preset time and then dropping to the ambient temperature when the heat pump unit enters the startup state, further includes:

[0023] Obtain the ambient temperature after the heat pump unit has been on standby for the first preset time, recorded as T, and calculate the first cooling time Δt1. The specific calculation formula is as follows:

[0024] Δt1=(T-T2) / V1;

[0025] Wherein, V1 is the first cooling rate, and T2 is the ambient temperature when the compressor oil pool enters the startup state.

[0026] Specifically, the second cooling time for the compressor oil pool temperature to drop to the preheating start temperature when the compressor oil pool is preheated after the heat pump unit has been on standby for the first preset time is calculated according to the second cooling rate, including:

[0027] Get the oil pool temperature T of the compressor oil pool after the heat pump unit has been on standby for the first preset time 油池 , calculate the second cooling time Δt2, the specific calculation formula is as follows:

[0028] Δt2=(T 油池 -T 油池2 ) / V2;

[0029] Among them, T 油池2 is the preheating start temperature, and V2 is the second cooling rate.

[0030] Specifically, calculating the first heating time for the compressor oil pool to rise from the preheating start temperature to the preheating cut-off temperature according to the first heating rate includes:

[0031] Preset the preheating cut-off temperature, denoted as T 预热截止温度 , calculate the first heating time Δt3, the specific calculation formula is as follows:

[0032] Δt3=(T 预热截止温度 -T 油池2 ) / V3;

[0033] Among them, T 油池2 is the preheating starting temperature, and V3 is the first heating rate.

[0034] Specifically, the preheating cut-off temperature is the temperature at which the compressor oil pool preheating stops.

[0035] Specifically, the calculating the preheating start temperature according to the first cooling time, the second cooling time, and the first heating time includes:

[0036] According to Δt1=Δt2+Δt3, the calculation formula is as follows:

[0037] (T-T2) / V1=(T 油池 -T 油池2 ) / V2+(T 预热截止温度 -T油池2 ) / V3;

[0038] Wherein, T is the ambient temperature after the heat pump unit has been on standby for the first preset time, T2 is the ambient temperature when the compressor oil pool enters the startup state, V1 is the first cooling rate, T 油池 is the oil pool temperature of the compressor oil pool after the heat pump unit has been on standby for the first preset time, V2 is the second cooling rate, T 预热截止温度 is the preheating cut-off temperature, V3 is the first heating rate;

[0039] Calculate the preheating start temperature T according to the above formula 油池2 .

[0040] Specifically, judging whether the oil pool temperature reaches the preheating start temperature, and controlling whether to preheat the compressor oil pool according to the judgment result, includes:

[0041] If the current compressor oil pool temperature reaches the preheating start temperature, the compressor oil pool is preheated;

[0042] If the current compressor oil pool temperature does not reach the preheating start temperature, the compressor oil pool will not be preheated and the compressor oil pool temperature will continue to be monitored.

[0043] According to a second aspect of the present invention, there is provided a heat pump system oil pool preheating control device, comprising:

[0044] Acquisition module: used for periodically acquiring the ambient temperature of the environment in which the heat pump unit is located and the oil pool temperature of the compressor oil pool of the heat pump unit after the heat pump unit is in standby mode;

[0045] Control module: used to calculate a first temperature change rate of the ambient temperature and a second temperature change rate of the oil pool temperature, and calculate a preheating start temperature for starting preheating of the compressor oil pool based on the first temperature change rate and the second temperature change rate; or used to determine whether the oil pool temperature reaches the preheating start temperature, and control whether to preheat the compressor oil pool based on the determination result.

[0046] According to a third aspect of the present invention, a heat pump device is provided, wherein the heat pump device comprises the above-mentioned heat pump system oil pool preheating control method.

[0047] Beneficial effects:

[0048] The present invention calculates the preheating starting temperature of the compressor oil pool within the standby start-stop temperature range of the heat pump unit, so that the oil temperature requirement is just met when the compressor oil pool is preheated and started to the time when the heat pump is started, thereby solving the technical problem of excessive energy consumption due to continuous heating of the compressor oil pool preheating device in the heat pump system in the standby state, greatly reducing the start-up power consumption of the compressor oil pool preheating control device during the standby period, further ensuring the reliable operation of the compressor, avoiding the continuous consumption of heating due to continuous preheating of the heat pump unit during the standby period, and at the same time avoiding the abnormal operation of the compressor caused by the untimely start-up of the compressor oil pool preheating control device, thereby greatly improving the energy utilization rate and the reliable operation of the heat pump system, and further extending the service life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a flow chart of a heat pump system oil pool preheating control method provided in a specific embodiment of the present invention;

[0050] Figure 2 It is a schematic diagram of the composition of the oil pool preheating control device of the heat pump system provided in a specific embodiment of the present invention;

[0051] Figure 3 It is a compressor oil pool preheating control timing diagram provided in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0053] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0054] Embodiment 1

[0055] See also Figure 1 This embodiment provides a heat pump system oil pool preheating control method, including:

[0056] S100, after the heat pump unit is in standby mode, periodically obtain the ambient temperature of the environment in which the heat pump unit is located and the oil pool temperature of the compressor oil pool of the heat pump unit;

[0057] It is understandable that the temperature sensor is used to monitor the ambient temperature of the environment in which the heat pump unit is located and the temperature of the compressor oil pool of the heat pump unit in real time. The environment in which the heat pump unit is located may be the water temperature of the water tank or the room temperature.

[0058] S200, calculating a first temperature change rate of the ambient temperature and a second temperature change rate of the oil pool temperature, and calculating a preheating start temperature for starting compressor oil pool preheating based on the first temperature change rate and the second temperature change rate.

[0059] Furthermore, by calculating the preheating start temperature of the compressor oil pool within the standby start-stop temperature range of the heat pump unit, the oil temperature requirement is just met when the compressor oil pool is preheated and started to the start of the heat pump unit, thereby solving the technical problem of excessive energy consumption due to continuous heating of the compressor oil pool preheating device in the standby state of the heat pump system, greatly reducing the power consumption of the compressor oil pool preheating control device during the standby period, and further ensuring the reliable operation of the compressor.

[0060] Specifically, the first temperature change rate is a first temperature drop rate at which the ambient temperature drops after the heat pump unit has been on standby for a first preset time;

[0061] The second temperature change rate includes a second temperature drop rate and a first temperature rise rate;

[0062] The second cooling rate is the rate at which the compressor oil pool drops from the temperature after the first preset standby time to the preheating start temperature;

[0063] The first heating rate is a rate at which the temperature of the compressor oil pool rises from a preheating start temperature to a preheating cut-off temperature.

[0064] See also Figure 3 , Figure 3 The solid line represents the temperature change line of the compressor oil pool, and the dotted line represents the temperature control area, that is, the ambient temperature change line of the environment where the heat pump unit is located. The heat pump unit runs to the set temperature T 设定 , that is, the machine stops at time t1, and the oil pool temperature is T 油池1 , the heat pump unit enters the standby state. The standby process is divided into two stages. The first stage is the dormant state of the compressor oil pool preheating device, and the second stage is the activated heating state of the compressor oil pool preheating device;

[0065] After the heat pump unit is in standby mode, it first enters the first stage. The ambient temperature (temperature in the temperature control area) and the compressor oil pool temperature will drop. Considering the oil pool temperature error caused by system imbalance, the oil pool temperature at time t4 is taken as T 油池Temperature, i.e., the temperature of the heat pump unit after the first preset time of standby. The first preset time is preferably 5 minutes in the present invention, which is used to eliminate the oil pool temperature error caused by system imbalance, and thus the influence on the calculation result. The second cooling rate (oil pool temperature drop rate) and the first cooling rate (control area temperature drop rate) are written into the control board in the calculation or extraction design stage;

[0066] When the compressor oil pool temperature T 油池 When the compressor oil pool temperature rises to the preheating cut-off temperature (T 预热截止温度 ), that is, at time t3, the heat pump unit is started again for heating, and the oil pool preheating device is turned off at the same time.

[0067] Specifically, the calculation of the preheating start temperature for starting the compressor oil pool preheating according to the first temperature change rate and the second temperature change rate includes:

[0068] According to the first cooling rate, a first cooling time is calculated for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the startup state after the ambient temperature of the heat pump unit has been on standby for a first preset time;

[0069] According to the second cooling rate, a second cooling time is calculated for the compressor oil pool temperature to drop to the preheating start temperature when the compressor oil pool is preheated after the heat pump unit has been on standby for the first preset time;

[0070] Calculating a first heating time for the compressor oil pool to rise from a preheating start temperature to a preheating cut-off temperature according to the first heating rate;

[0071] The preheating start temperature is calculated according to the first temperature drop time, the second temperature drop time, and the first temperature rise time.

[0072] It should be further explained that in order to achieve the compressor oil pool temperature just reaching T 预热截止温度 In order to avoid heat loss caused by premature start-up and insufficient oil pool temperature caused by late start-up, it is necessary to determine the preheating start temperature of the compressor oil pool so that the time for the compressor oil pool to cool down to the preheating start temperature plus the time for the compressor oil pool to heat up to the preheating cut-off temperature is exactly equal to the time for the ambient temperature (temperature control area temperature) to drop to the time for the heat pump unit to start again, that is, the first cooling time = the second cooling time + the first heating time.

[0073] Specifically, the first cooling rate is used to calculate the first cooling time for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the startup state after the ambient temperature of the heat pump unit has been on standby for the first preset time, including:

[0074] The first set value T of the ambient temperature for making the heat pump unit enter the standby state is preset 设定 , and the difference ΔT of the ambient temperature from the standby state to the startup state of the heat pump unit, according to the first set value T 设定 The difference between the ambient temperature and the ambient temperature ΔT is used to calculate the ambient temperature T2 when the compressor oil pool enters the startup state. The specific calculation formula is as follows:

[0075] T2=T 设定 -ΔT.

[0076] See also Figure 3 , pre-set the first set value T of the ambient temperature that makes the heat pump unit enter the standby state 设定 , unit ℃, and preset the difference ΔT of the ambient temperature from the standby state to the start-up state of the heat pump unit, unit ℃, the difference ΔT of the ambient temperature can be 0 to 15℃, that is, when the ambient temperature of the environment where the heat pump unit is located changes from T 设定 Reduce to T 设定 -ΔT, that is, at T2, the heat pump unit starts heating operation again.

[0077] Specifically, the first cooling time for calculating, according to the first cooling rate, the ambient temperature after the heat pump unit has been on standby for a first preset time and then dropping to the ambient temperature when the heat pump unit enters the startup state, further includes:

[0078] Obtain the ambient temperature after the heat pump unit has been on standby for the first preset time, recorded as T, and calculate the first cooling time Δt1. The specific calculation formula is as follows:

[0079] Δt1=(T-T2) / V1;

[0080] Wherein, V1 is the first cooling rate, and T2 is the ambient temperature when the compressor oil pool enters the startup state.

[0081] Furthermore, the first cooling rate V1 can be detected by a temperature sensing package, such as the room temperature is detected by the indoor environment temperature sensing package, and the water temperature of the water tank is detected by the water tank temperature sensing package. The detection data can be collected for real-time correction, the unit is ℃ / min. For the room temperature, the indoor environment temperature sensing package is used to detect the temperature value of the room; for the water temperature of the water tank, the water temperature value of the water tank is detected by the water tank temperature sensing package. These temperature sensing packages can sense the temperature of the environment or object, and convert the temperature information into collectable data. Within a certain time interval, these temperature data are continuously collected. For example, the temperature value is recorded once every certain time (set as Δt) to form a series of temperature data points, and then the cooling rate is calculated. Let the initial temperature be T1, and the temperature after a period of time be T2, then the temperature change ΔT=T2-T1. According to the definition of rate, the first cooling rate V1=ΔT / Δt. In actual situations, since the detection data can be collected for real-time correction, it can be continuously updated as new data is continuously collected, so as to more accurately calculate the cooling rate. For the heating rate, the calculation principle is similar, except that the temperature change may be positive (temperature increase).

[0082] Specifically, the second cooling time for the compressor oil pool temperature to drop to the preheating start temperature when the compressor oil pool is preheated after the heat pump unit has been on standby for the first preset time is calculated according to the second cooling rate, including:

[0083] Get the oil pool temperature T of the compressor oil pool after the heat pump unit has been on standby for the first preset time 油池 , calculate the second cooling time Δt2, the specific calculation formula is as follows:

[0084] Δt2=(T 油池 -T 油池2 ) / V2;

[0085] Among them, T 油池2 is the preheating start temperature, and V2 is the second cooling rate.

[0086] See also Figure 3 , use the temperature sensor to detect the compressor oil pool temperature T at time t4, 5 minutes after standby. 油池, and the second cooling rate V2 can be calculated by dividing the temperature detected by the temperature sensor by the time on the controller's timer, and can be corrected in real time according to temperature changes, in units of ℃ / min. The timer can accurately record the time from the start of monitoring to the current moment. According to the definition of rate, the rate is equal to the change divided by the time. Here, the second cooling rate V2 is calculated by dividing the temperature detected by the temperature sensor by the time on the timer. Since it can be corrected in real time according to temperature changes, this means that as the temperature continues to change, the new temperature value will be detected by the temperature sensor, so that the calculation result of the cooling rate can be continuously adjusted according to the real-time change of temperature, so that it can more accurately reflect the actual cooling situation.

[0087] Specifically, calculating the first heating time for the compressor oil pool to rise from the preheating start temperature to the preheating cut-off temperature according to the first heating rate includes:

[0088] Preset the preheating cut-off temperature, denoted as T 预热截止温度 , calculate the first heating time Δt3, the specific calculation formula is as follows:

[0089] Δt3=(T 预热截止温度 -T 油池2 ) / V3;

[0090] Among them, T 油池2 is the preheating starting temperature, and V3 is the first heating rate.

[0091] Specifically, the preheating cut-off temperature is the temperature at which the compressor oil pool preheating stops.

[0092] See also Figure 3 The preheating cut-off temperature can be determined according to the characteristic parameters of the lubricating oil. The unit is ℃ and the value range is 5-20℃. The characteristics of the lubricating oil vary at different temperatures, and its viscosity will change with temperature. At lower temperatures, the viscosity of the lubricating oil is larger and the fluidity is poorer. As the temperature rises, the viscosity decreases and the fluidity improves. The value range is set at 5-20℃ because within this temperature range, the various properties of the lubricating oil can meet the operating requirements of the equipment. If the temperature is lower than 5℃, the lubricating oil may be too viscous and cannot play a good role in lubrication and heat dissipation. When the temperature is higher than 20℃, some properties of the lubricating oil may decay prematurely or exceed the optimal parameter range for normal operation of the equipment.

[0093] Furthermore, the first heating rate V3 can be obtained by experimentally testing the temperature rise rate of the oil pool when the compressor oil pool preheating device is heating. In actual situations, the heating rate of the compressor oil pool is affected by many factors, including the power of the oil pool preheating device, the volume of the oil pool, the heat dissipation of the oil pool, and the thermal conductivity of the lubricating oil itself. In the experiment, the initial temperature of the oil pool is measured, and then the preheating device is started, and the timing is started at the same time. As time goes by, the oil pool temperature continues to rise, and the first heating rate V3 of the oil pool temperature corresponding to different times is recorded. Through multiple experiments and testing under different working conditions (such as different preheating device powers, different initial oil volumes in the oil pool, etc.), a more accurate first heating rate V3 can be obtained, thereby providing reliable data support for the preheating process of the equipment.

[0094] Specifically, the calculating the preheating start temperature according to the first cooling time, the second cooling time, and the first heating time includes:

[0095] According to Δt1=Δt2+Δt3, the calculation formula is as follows:

[0096] (T-T2) / V1=(T 油池 -T 油池2 ) / V2+(T 预热截止温度 -T 油池2 ) / V3;

[0097] Wherein, T is the ambient temperature after the heat pump unit has been on standby for the first preset time, T2 is the ambient temperature when the compressor oil pool enters the startup state, V1 is the first cooling rate, T 油池 is the oil pool temperature of the compressor oil pool after the heat pump unit has been on standby for the first preset time, V2 is the second cooling rate, T 预热截止温度 is the preheating cut-off temperature, V3 is the first heating rate;

[0098] Calculate the preheating start temperature T according to the above formula 油池2 .

[0099] It can be understood that the preheating start temperature of the compressor oil pool is solved according to the above equation, and when the compressor oil pool temperature reaches this temperature point, an instruction is sent to control the oil pool preheating device to start heating. During the standby process of the heat pump unit, once the compressor oil pool preheating device is started, the preheating start temperature will no longer be updated until the next standby state of the heat pump unit is entered.

[0100] Furthermore, during the standby process of the heat pump unit, once the compressor oil pool preheating device is started, the preheating start temperature is no longer updated. This is because during the standby period, the operating state of the equipment is relatively stable, and there is no need to frequently adjust the preheating start temperature. If the preheating start temperature is frequently updated during this process, it may cause the preheating device to start and stop frequently, increasing the loss and energy consumption of the equipment. This stable preheating start temperature setting continues until the next heat pump unit standby, which means that during the entire operation cycle of the heat pump unit, the preheating start temperature strategy during each standby period is relatively fixed, which helps to simplify the control logic of the equipment and improve the reliability and stability of the equipment operation. At the same time, it also provides convenience for the maintenance and management of the equipment, because there is no need to re-evaluate and adjust the preheating start temperature during each standby period.

[0101] S300, determining whether the oil pool temperature reaches the preheating start temperature, and controlling whether to preheat the compressor oil pool according to the determination result.

[0102] Specifically, the determining whether the compressor oil pool temperature reaches the preheating start temperature, and determining whether to preheat the compressor oil pool according to the determination result, includes:

[0103] If the current compressor oil pool temperature reaches the preheating start temperature, the compressor oil pool is preheated;

[0104] If the current compressor oil pool temperature does not reach the preheating start temperature, the compressor oil pool will not be preheated and the compressor oil pool temperature will continue to be monitored.

[0105] The working principle of the present invention is described below by taking a room air conditioner as an example:

[0106] Assuming that the outdoor temperature for winter heating is -10℃ and the indoor temperature is 10℃, the default starting temperature difference of the ambient temperature of the heat pump unit is 3℃, and the preheating cut-off temperature is 5℃;

[0107] At this time, the ambient temperature is set to 20℃ to start the unit. After starting, the heat pump unit enters heating operation. When the indoor ambient temperature reaches 22℃, the heat pump unit enters standby mode. 5 minutes after entering standby mode, the compressor oil pool temperature collected by the sensor is 30℃. The ambient temperature and indoor set temperature have not changed. Combined with the parameters detected by the sensor at this moment, and querying the pre-calibrated compressor oil pool temperature drop rate built into the controller, that is, the second cooling rate is 2℃ / min, the compressor oil pool preheating temperature rise rate, that is, the first heating rate is 0.5℃ / min, and the room temperature drop rate, that is, the first cooling rate is 0.2℃ / min. Substitute it into the calculation formula of the preheating start temperature, and you can get:

[0108]

[0109] The calculated preheating start temperature of the compressor oil pool is 4°C, that is, when the temperature of the compressor oil pool drops to 4°C, the preheating device needs to start heating.

[0110] It should be noted here that this embodiment calculates the preheating start temperature of the compressor oil pool within the standby start-stop temperature range of the heat pump unit, so that the oil temperature requirement is just met when the compressor oil pool is preheated and started to the time when the heat pump is started, thereby solving the technical problem of excessive energy consumption due to continuous heating of the compressor oil pool preheating device in the heat pump system in standby state, greatly reducing the start-up power consumption of the compressor oil pool preheating control device during the standby period, further ensuring the reliable operation of the compressor, avoiding the continuous preheating consumption of the heat pump unit during the standby period, and at the same time avoiding the abnormal operation of the compressor caused by the untimely start-up of the compressor oil pool preheating control device, thereby greatly improving the energy utilization rate and the reliable operation of the heat pump system, and further extending the service life of the compressor.

[0111] Embodiment 2

[0112] See also Figure 2 This embodiment provides a heat pump system oil pool preheating control device, the device comprising:

[0113] Acquisition module 100: for periodically acquiring the ambient temperature of the environment in which the heat pump unit is located and the oil pool temperature of the compressor oil pool of the heat pump unit after the heat pump unit is in standby mode;

[0114] Control module 200: used to calculate a first temperature change rate of the ambient temperature and a second temperature change rate of the oil pool temperature, and calculate a preheating start temperature for starting preheating of the compressor oil pool based on the first temperature change rate and the second temperature change rate; or used to determine whether the oil pool temperature reaches the preheating start temperature, and control whether to preheat the compressor oil pool based on the determination result.

[0115] It should be noted here that this embodiment calculates the preheating start temperature of the compressor oil pool within the standby start-stop temperature range of the heat pump unit, so that the oil temperature requirement is just met when the compressor oil pool is preheated and started to the time when the heat pump is started, thereby solving the technical problem of excessive energy consumption due to continuous heating of the compressor oil pool preheating device in the heat pump system in standby state, greatly reducing the start-up power consumption of the compressor oil pool preheating control device during the standby period, further ensuring the reliable operation of the compressor, avoiding the continuous preheating consumption of the heat pump unit during the standby period, and at the same time avoiding the abnormal operation of the compressor caused by the untimely start-up of the compressor oil pool preheating control device, thereby greatly improving the energy utilization rate and the reliable operation of the heat pump system, and further extending the service life of the compressor.

[0116] Embodiment 3

[0117] This embodiment further provides a heat pump device, which includes the heat pump system oil pool preheating control method in the first embodiment.

[0118] The method includes periodically obtaining the ambient temperature of the environment in which the heat pump unit is located and the temperature of the compressor oil pool of the heat pump unit after the heat pump unit is in standby mode; obtaining a first temperature change rate of the ambient temperature of the environment in which the heat pump unit is located, obtaining a second temperature change rate of the temperature of the compressor oil pool, and calculating a preheating start temperature for starting the compressor oil pool according to the first temperature change rate and the second temperature change rate; judging whether the temperature of the compressor oil pool reaches the preheating start temperature, and judging whether to preheat the compressor oil pool according to the judgment result.

[0119] It should be noted here that the present embodiment provides a heat pump device, which calculates the preheating start temperature of the compressor oil pool within the standby start-stop temperature range of the heat pump unit, so that the oil temperature requirement is just met when the compressor oil pool is preheated and started to the time when the heat pump is started, thereby solving the technical problem of excessive energy consumption of the compressor oil pool preheating device in the standby state of the heat pump system, greatly reducing the power consumption of the compressor oil pool preheating control device during the standby period, further ensuring the reliable operation of the compressor, avoiding the continuous preheating consumption of the heat pump unit during the standby period, and avoiding the abnormal operation of the compressor caused by the untimely start of the compressor oil pool preheating control device, thereby greatly improving the energy utilization rate and the reliable operation of the heat pump system, further extending the service life of the compressor, and greatly improving the reliability of the entire heat pump equipment, so that the heat pump equipment can operate more stably.

[0120] Embodiment 4

[0121] This embodiment further provides an electronic device, the electronic device comprising:

[0122] A memory; and a processor, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the heat pump system oil pool preheating control method is implemented. The computer device can be broadly a server, a terminal, or any other electronic device with necessary computing and / or processing capabilities. In one embodiment, the computer device may include a processor, a memory, a network interface, a communication interface, etc. connected via a system bus. The processor of the computer device can be used to provide necessary computing, processing and / or control capabilities. The memory of the computer device may include a non-volatile storage medium and an internal memory. An operating system, a computer program, etc. may be stored in or on the non-volatile storage medium. The internal memory can provide an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface and the communication interface of the computer device can be used to connect and communicate with external devices via a network. When the computer program is executed by the processor, the steps of the method of the present invention are performed.

[0123] The present invention may be implemented as a computer-readable storage medium having a computer program stored thereon, which causes the steps of the method of an embodiment of the present invention to be executed when executed by a processor. In one embodiment, the computer program is distributed on a plurality of computer devices or processors coupled to a network so that the computer program is stored, accessed and executed in a distributed manner by one or more computer devices or processors. A single method step / operation, or two or more method steps / operations, may be performed by a single computer device or processor or by two or more computer devices or processors. One or more method steps / operations may be performed by one or more computer devices or processors, and one or more other method steps / operations may be performed by one or more other computer devices or processors. One or more computer devices or processors may perform a single method step / operation, or perform two or more method steps / operations.

[0124] It should be noted here that the present invention calculates the preheating start-up temperature of the compressor oil pool within the standby start-stop temperature range of the heat pump unit, so that the oil temperature requirement is just met when the compressor oil pool is preheated and started to the time when the heat pump is started, thereby solving the technical problem of excessive energy consumption due to continuous heating of the compressor oil pool preheating device in the heat pump system in standby state, greatly reducing the start-up power consumption of the compressor oil pool preheating control device during the standby period, further ensuring the reliable operation of the compressor, avoiding the continuous consumption of heating due to continuous preheating of the heat pump unit during the standby period, and at the same time avoiding the abnormal operation of the compressor caused by the untimely start-up of the compressor oil pool preheating control device, thereby greatly improving the energy utilization rate and the reliable operation of the heat pump system, and further extending the service life of the compressor.

[0125] The various technical features described above can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as there is no contradiction in such combination.

[0126] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A heat pump system oil pool preheating control method, characterized in that: include: S100, after the heat pump unit is in standby mode, periodically obtain the ambient temperature of the environment in which the heat pump unit is located and the oil pool temperature of the compressor oil pool of the heat pump unit; S200, calculating a first temperature change rate of the ambient temperature and a second temperature change rate of the oil pool temperature, and calculating a preheating start temperature for starting compressor oil pool preheating according to the first temperature change rate and the second temperature change rate; S300, judging whether the oil pool temperature reaches the preheating start temperature, and controlling whether to preheat the compressor oil pool according to the judgment result.

2. The heat pump system oil pool preheating control method according to claim 1, characterized in that: The first temperature change rate is a first temperature drop rate at which the ambient temperature drops after the heat pump unit has been on standby for a first preset time; The second temperature change rate includes a second temperature drop rate and a first temperature rise rate; The second cooling rate is the rate at which the compressor oil pool drops from the temperature after the first preset standby time to the preheating start temperature; The first heating rate is a rate at which the temperature of the compressor oil pool rises from a preheating start temperature to a preheating cut-off temperature.

3. The heat pump system oil pool preheating control method according to claim 2, characterized in that: The step of calculating the preheating start temperature for starting compressor oil pool preheating according to the first temperature change rate and the second temperature change rate comprises: According to the first cooling rate, a first cooling time is calculated for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the startup state after the ambient temperature of the heat pump unit has been on standby for a first preset time; According to the second cooling rate, a second cooling time is calculated for the compressor oil pool temperature to drop to the preheating start temperature when the compressor oil pool is preheated after the heat pump unit has been on standby for the first preset time; Calculating a first heating time for the compressor oil pool to rise from a preheating start temperature to a preheating cut-off temperature according to the first heating rate; The preheating start temperature is calculated according to the first temperature drop time, the second temperature drop time, and the first temperature rise time.

4. The heat pump system oil pool preheating control method according to claim 3, characterized in that: The first cooling rate is used to calculate the first cooling time for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the startup state after the ambient temperature of the heat pump unit has been on standby for the first preset time, including: The first set value T of the ambient temperature for making the heat pump unit enter the standby state is preset 设定 , and the difference ΔT of the ambient temperature of the heat pump unit from the standby state to the startup state, according to the first set value T 设定 The difference between the ambient temperature and the ambient temperature ΔT is used to calculate the ambient temperature T2 when the compressor oil pool enters the startup state. The specific calculation formula is as follows: T2=T 设定 -ΔT。 5. The heat pump system oil pool preheating control method according to claim 4, characterized in that: The first cooling rate is used to calculate the first cooling time after the heat pump unit has been on standby for a first preset time, when the ambient temperature drops to the ambient temperature when the heat pump unit enters the startup state, and further includes: Obtain the ambient temperature after the heat pump unit has been on standby for the first preset time, recorded as T, and calculate the first cooling time Δt1. The specific calculation formula is as follows: Δt1=(T-T2) / V1; Wherein, V1 is the first cooling rate, and T2 is the ambient temperature when the compressor oil pool enters the startup state.

6. The heat pump system oil pool preheating control method according to claim 4, characterized in that: The second cooling rate is used to calculate the second cooling time after the heat pump unit has been on standby for a first preset time and the temperature of the compressor oil pool drops to the preheating start temperature when the compressor oil pool is preheated, including: Get the oil pool temperature T of the compressor oil pool after the heat pump unit has been on standby for the first preset time 油池 , calculate the second cooling time Δt2, the specific calculation formula is as follows: Δt2=(T 油池 -T 油池2 ) / V2; Among them, T 油池2 is the preheating start temperature, and V2 is the second cooling rate.

7. The heat pump system oil pool preheating control method according to claim 5, characterized in that: The calculating, according to the first heating rate, a first heating time for the compressor oil pool to rise from the preheating start temperature to the preheating cut-off temperature comprises: Preset the preheating cut-off temperature, denoted as T 预热截止温度 , calculate the first heating time Δt3, the specific calculation formula is as follows: Δt3=(T 预热截止温度 -T 油池2 ) / V3; Among them, T 油池2 is the preheating starting temperature, and V3 is the first heating rate.

8. The heat pump system oil pool preheating control method according to claim 7, characterized in that: The preheating cut-off temperature is the temperature at which the compressor oil pool preheating stops.

9. The heat pump system oil pool preheating control method according to claim 7, characterized in that: The calculating the preheating start temperature according to the first cooling time, the second cooling time, and the first heating time includes: According to Δt1=Δt2+Δt3, the calculation formula is as follows: (T-T2) / V1=(T 油池 -T 油池2 ) / V2+(T 预热截止温度 -T 油池2 ) / V3; Wherein, T is the ambient temperature after the heat pump unit has been on standby for the first preset time, T2 is the ambient temperature when the compressor oil pool enters the startup state, V1 is the first cooling rate, T 油池 is the oil pool temperature of the compressor oil pool after the heat pump unit has been on standby for the first preset time, V2 is the second cooling rate, T 预热截止温度 is the preheating cut-off temperature, V3 is the first heating rate; Calculate the preheating start temperature T according to the above formula 油池2 .

10. The heat pump system oil pool preheating control method according to claim 1, characterized in that: The determining whether the oil pool temperature reaches the preheating start temperature and controlling whether to preheat the compressor oil pool according to the determination result includes: If the current compressor oil pool temperature reaches the preheating start temperature, the compressor oil pool is preheated; If the current compressor oil pool temperature does not reach the preheating start temperature, the compressor oil pool will not be preheated and the compressor oil pool temperature will continue to be monitored.

11. A heat pump system oil pool preheating control device, characterized in that: include: An acquisition module (100): used to periodically acquire the ambient temperature of the environment in which the heat pump unit is located and the oil pool temperature of the compressor oil pool of the heat pump unit after the heat pump unit is in standby mode; A control module (200): used to calculate a first temperature change rate of the ambient temperature and a second temperature change rate of the oil pool temperature, and to calculate a preheating start temperature for starting preheating of the compressor oil pool based on the first temperature change rate and the second temperature change rate; or to determine whether the oil pool temperature reaches the preheating start temperature, and to control whether to preheat the compressor oil pool based on the determination result.

12. A heat pump device, characterized in that: The heat pump device includes the heat pump system oil pool preheating control method according to any one of claims 1 to 8.

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