A method and apparatus for preheating the oil tank in a heat pump system, and heat pump equipment.

Abstract

This invention provides a method and device for controlling the preheating of the oil bath in a heat pump system, and a heat pump device, comprising: after the heat pump unit is in standby mode, periodically acquiring the ambient temperature of the environment where the heat pump unit is located and the oil bath temperature of the compressor oil bath of the heat pump unit; calculating a first temperature change rate of the ambient temperature and a second temperature change rate of the oil bath temperature, and calculating the preheating start temperature for starting the compressor oil bath preheating based on the first temperature change rate and the second temperature change rate; determining whether the oil bath temperature has reached the preheating start temperature, and controlling whether to preheat the compressor oil bath based on the determination result. This invention solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system, greatly reducing the power consumption of the compressor oil bath preheating control device during standby, further ensuring the reliable operation of the compressor, and avoiding continuous heating consumption due to continuous preheating during the standby period of the heat pump unit.

Description

Technical Field

[0001] This invention relates to the field of oil tank preheating control technology for heat pump systems, specifically to a method and device for oil tank preheating control in heat pump systems, and heat pump equipment. Background Technology

[0002] When a heat pump system is placed in a low-temperature environment, the refrigerant migrates to the low-temperature components, especially the compressor parts, 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 moving parts when it is restarted, increasing operating power consumption or even causing abnormalities such as seizure.

[0003] The commonly used control method is to preheat the compressor oil bath by turning on the electric heating belt or compressor motor winding when the ambient temperature is below a certain level after the heat pump unit is in standby mode. This promotes the volatilization of refrigerant that has migrated into the compressor, increases the concentration of lubricating oil, and avoids compressor damage caused by lubrication failure. However, continuous heating based on ambient temperature will cause excessive power consumption. This results in excessive energy consumption due to the continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system, leading to energy waste.

[0004] Therefore, existing technologies still need further development. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a method and device for controlling the preheating of the oil tank in a heat pump system, as well as a heat pump device, to solve the technical problem that the current method of judging the continuous heating of the compressor oil tank based on the ambient temperature will cause excessive power consumption, resulting in excessive energy consumption of the compressor oil tank preheating device in the standby state of the heat pump system, thus causing energy waste.

[0006] To achieve the above-mentioned technical objectives, according to a first aspect of the present invention, the present invention provides a method for controlling the preheating of an oil sump in a heat pump system, comprising:

[0007] S100 After the heat pump unit is in standby mode, the ambient temperature of the environment where the heat pump unit is located and the oil sump temperature of the compressor oil sump of the heat pump unit are periodically obtained.

[0008] S200. Calculate the first temperature change rate of the ambient temperature and the second temperature change rate of the oil sump temperature, and calculate the preheating start temperature for starting the compressor oil sump preheating based on the first temperature change rate and the second temperature change rate.

[0009] S300: Determine whether the oil sump temperature has reached the preheating start-up temperature, and control whether to preheat the compressor oil sump based on the determination result.

[0010] Specifically, the first temperature change rate is the first cooling rate of the ambient temperature after the heat pump unit has been in standby for a first preset time.

[0011] The second temperature change rate includes a second cooling rate and a first heating rate;

[0012] The second cooling rate is the rate at which the temperature of the compressor oil sump drops from the temperature after the first preset standby time to the preheating start-up temperature;

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

[0014] Specifically, calculating the preheating start-up temperature for preheating the compressor oil sump based on the first temperature change rate and the second temperature change rate includes:

[0015] Based on the first cooling rate, calculate the first cooling time when the ambient temperature drops to the ambient temperature when the heat pump unit enters the start-up state after the first preset standby time of the heat pump unit.

[0016] Based on the second cooling rate, calculate the second cooling time when the temperature of the compressor oil bath drops to the preheating start temperature of the compressor oil bath after the first preset standby time of the heat pump unit;

[0017] Based on the first heating rate, calculate the first heating time for the compressor oil sump to rise from the preheating start temperature to the preheating stop temperature.

[0018] The preheating start temperature is calculated based on the first cooling time, the second cooling time, and the first heating time.

[0019] Specifically, the first cooling time, calculated based on the first cooling rate, for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the start-up state after a first preset standby time, includes:

[0020] A first setpoint T for the ambient temperature that pre-sets to put the heat pump unit into standby mode. 设定 And the difference in ambient temperature ΔT between the standby state and the start-up state of the heat pump unit, based on 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 sump enters the start-up state. The specific calculation formula is as follows:

[0021] T2 = T 设定 -ΔT.

[0022] Specifically, the step of calculating the first cooling time, based on the first cooling rate, for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the start-up state after a first preset standby time, further includes:

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

[0024] Δt1=(T-T2) / V1;

[0025] Where V1 is the first cooling rate and T2 is the ambient temperature when the compressor oil sump enters the start-up state.

[0026] Specifically, the second cooling time, calculated based on the second cooling rate, for the temperature of the compressor oil bath to drop to the preheating start-up temperature of the compressor oil bath after the heat pump unit has been idle for a first preset time, includes:

[0027] The oil sump temperature T of the compressor oil sump after the first preset standby time of the heat pump unit is obtained. 油池 The second cooling time Δt2 is calculated using the following formula:

[0028] Δt2=(T 油池 -T 油池2 ) / V2;

[0029] Among them, T 油池2 V1 represents the preheating start-up temperature, and V2 represents the second cooling rate.

[0030] Specifically, calculating the first heating time for the compressor oil sump to rise from the preheating start-up temperature to the preheating stop temperature based on the first heating rate includes:

[0031] The preheating cutoff temperature is preset and denoted as T. 预热截止温度 Calculate the first heating time Δt3 using the following formula:

[0032] Δt3=(T 预热截止温度 -T 油池2 ) / V3;

[0033] Among them, T 油池2 V3 represents the preheating start-up temperature, and V3 represents the first heating rate.

[0034] Specifically, the preheating cutoff temperature is the temperature at which the compressor oil sump preheating stops.

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

[0036] Based on 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] Where T is the ambient temperature after the heat pump unit has been idle for the first preset time, T2 is the ambient temperature when the compressor oil sump enters the start-up state, V1 is the first cooling rate, and T 油池 V1 represents the oil sump temperature of the compressor oil sump after the first preset standby time of the heat pump unit, V2 represents the second cooling rate, and T represents the temperature of the compressor oil sump. 预热截止温度 V3 is the preheating cutoff temperature, and V3 is the first heating rate.

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

[0040] Specifically, determining whether the oil sump temperature has reached the preheating start-up temperature, and controlling whether to preheat the compressor oil sump based on the determination result, includes:

[0041] If the current compressor oil sump temperature reaches the preheating start-up temperature, then preheat the compressor oil sump.

[0042] If the current compressor oil sump temperature has not reached the preheating start-up temperature, the compressor oil sump will not be preheated, and the compressor oil sump temperature will continue to be monitored.

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

[0044] Acquisition module: used to periodically acquire the ambient temperature of the environment where the heat pump unit is located and the oil sump temperature of the compressor oil sump of the heat pump unit after the heat pump unit is in standby mode;

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

[0046] According to a third aspect of the present invention, a heat pump device is provided, the heat pump device comprising the above-described heat pump system oil sump preheating control method.

[0047] Beneficial effects:

[0048] This invention calculates the preheating start-up temperature of the compressor oil bath within the standby start-up temperature range of the heat pump unit, ensuring that the oil temperature requirement is met precisely from the start-up of the compressor oil bath to the start-up of the heat pump. This solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system. It greatly reduces the power consumption of the compressor oil bath preheating control device during standby, further ensuring the reliable operation of the compressor, avoiding continuous heating consumption during the standby period of the heat pump unit, and preventing compressor malfunctions caused by untimely activation of the compressor oil bath preheating control device. This significantly improves energy utilization and the reliable operation of the heat pump system, further extending the service life of the compressor. Attached Figure Description

[0049] Figure 1 This is a flowchart of the heat pump system oil tank preheating control method provided in a specific embodiment of the present invention;

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

[0051] Figure 3 This is a timing diagram for compressor oil sump preheating control provided in a specific embodiment of the present invention. Detailed Implementation

[0052] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

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

[0054] Example 1

[0055] Please see Figure 1 This embodiment provides a method for controlling the preheating of the oil sump in a heat pump system, including:

[0056] S100 After the heat pump unit is in standby mode, the ambient temperature of the environment where the heat pump unit is located and the oil sump temperature of the compressor oil sump of the heat pump unit are periodically obtained.

[0057] It is understandable that temperature sensors are used to monitor the ambient temperature of the environment where the heat pump unit is located and the temperature of the compressor oil bath of the heat pump unit in real time. The environment where the heat pump unit is located can be the water temperature in the water tank or the room temperature, etc.

[0058] S200. Calculate the first temperature change rate of the ambient temperature and the second temperature change rate of the oil sump temperature, and calculate the preheating start temperature for starting the compressor oil sump preheating based on the first temperature change rate and the second temperature change rate.

[0059] Furthermore, by calculating the preheating start-up temperature of the compressor oil bath within the standby start-up temperature range of the heat pump unit, the oil temperature requirement is met precisely when the compressor oil bath is preheated and the heat pump unit starts. This solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system, greatly reduces the power consumption of the compressor oil bath preheating control device during standby, and further ensures the reliable operation of the compressor.

[0060] Specifically, the first temperature change rate is the first cooling rate of the ambient temperature after the heat pump unit has been in standby for a first preset time.

[0061] The second temperature change rate includes a second cooling rate and a first heating rate;

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

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

[0064] See Figure 3 , Figure 3 The solid line represents the temperature change line of the compressor oil sump, and the dotted line represents the temperature control zone, that is, the ambient temperature change line of the environment in which the heat pump unit is located. The heat pump unit operates until it reaches the set temperature T. 设定 The machine stops at time t1, at which point the oil sump temperature is T. 油池1 The heat pump unit enters standby mode. The standby process is divided into two stages: the first stage is the dormant state of the compressor oil bath preheating device, and the second stage is the activated heating state of the compressor oil bath preheating device.

[0065] After the heat pump unit is in standby mode, it first enters the first stage, during which both the ambient temperature (temperature control zone temperature) and the compressor oil sump temperature decrease. Considering the oil sump temperature error caused by system imbalance, the oil sump temperature at time t4 is used as T. 油池Temperature refers to the temperature after the heat pump unit has been idle for a first preset time. In this invention, the first preset time is preferably 5 minutes to eliminate the oil pool temperature error caused by system imbalance, which in turn affects the calculation results. 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 during the calculation or design stage.

[0066] When the compressor oil sump temperature T 油池 The temperature drops to the preheating start-up temperature of the compressor oil sump, at which point the second stage begins, and the compressor oil sump preheating device is activated for preheating; when the compressor oil sump temperature rises to the preheating cut-off temperature (T... 预热截止温度 At time t3, the heat pump unit is restarted for heating, and the oil bath preheating device is turned off.

[0067] Specifically, calculating the preheating start-up temperature for preheating the compressor oil sump based on the first temperature change rate and the second temperature change rate includes:

[0068] Based on the first cooling rate, calculate the first cooling time when the ambient temperature drops to the ambient temperature when the heat pump unit enters the start-up state after the first preset standby time of the heat pump unit.

[0069] Based on the second cooling rate, calculate the second cooling time when the temperature of the compressor oil bath drops to the preheating start temperature of the compressor oil bath after the first preset standby time of the heat pump unit;

[0070] Based on the first heating rate, calculate the first heating time for the compressor oil sump to rise from the preheating start temperature to the preheating stop temperature.

[0071] The preheating start temperature is calculated based on the first cooling time, the second cooling time, and the first heating time.

[0072] It should be further explained that, in order to ensure that the compressor oil sump temperature reaches exactly T every time the heat pump unit is restarted... 预热截止温度 To avoid heat loss from starting too early and insufficient oil sump temperature from starting too late, it is necessary to determine the preheating start temperature of the compressor oil sump. The time for the compressor oil sump to cool down to the preheating start temperature plus the time for the compressor oil sump to heat up to the preheating cutoff temperature should be exactly equal to the time for the ambient temperature (temperature control zone temperature) to drop to the point where the heat pump unit restarts. That is, the first cooling time = the second cooling time + the first heating time.

[0073] Specifically, the first cooling time, calculated based on the first cooling rate, for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the start-up state after a first preset standby time, includes:

[0074] A first setpoint T for the ambient temperature that pre-sets to put the heat pump unit into standby mode. 设定 And the difference in ambient temperature ΔT between the standby state and the start-up state of the heat pump unit, based on 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 sump enters the start-up state. The specific calculation formula is as follows:

[0075] T2 = T 设定 -ΔT.

[0076] See Figure 3 A first set value T of the ambient temperature is preset to put the heat pump unit into standby mode. 设定 The unit is °C, and the unit is ΔT, which is the pre-set difference in ambient temperature between the standby and start-up states of the heat pump unit, also in °C. The ambient temperature difference ΔT can range from 0 to 15 °C, meaning that 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, i.e., T2, the heat pump unit restarts its heating operation.

[0077] Specifically, the step of calculating the first cooling time, based on the first cooling rate, for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the start-up state after a first preset standby time, further includes:

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

[0079] Δt1=(T-T2) / V1;

[0080] Where V1 is the first cooling rate and T2 is the ambient temperature when the compressor oil sump enters the start-up state.

[0081] Furthermore, the first cooling rate V1 can be detected by temperature sensors. For example, room temperature is detected by an indoor environmental temperature sensor, and water tank temperature is detected by a water tank temperature sensor. Data can be collected and corrected in real time, with units of °C / min. For room temperature, the indoor environmental temperature sensor detects the room temperature; for water tank temperature, the water tank temperature sensor detects the water tank temperature. These sensors can sense the temperature of the environment or objects and convert this temperature information into collectable data. This temperature data is continuously collected at certain time intervals. For example, the temperature value is recorded every certain time interval (denoted as Δt), forming a series of temperature data points, which are then used to calculate the cooling rate. 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 practice, because data can be collected and corrected in real time, the data can be continuously updated as new data is collected, thus calculating the cooling rate more accurately. The calculation principle for the heating rate is similar, except that the temperature change may be positive (temperature increases).

[0082] Specifically, the second cooling time, calculated based on the second cooling rate, for the temperature of the compressor oil bath to drop to the preheating start-up temperature of the compressor oil bath after the heat pump unit has been idle for a first preset time, includes:

[0083] The oil sump temperature T of the compressor oil sump after the first preset standby time of the heat pump unit is obtained. 油池 The second cooling time Δt2 is calculated using the following formula:

[0084] Δt2=(T 油池 -T 油池2 ) / V2;

[0085] Among them, T 油池2 V1 represents the preheating start-up temperature, and V2 represents the second cooling rate.

[0086] See Figure 3 The compressor oil sump temperature T was detected by a temperature sensor 5 minutes after standby, i.e., at time t4. 油池The second cooling rate V2 is calculated by dividing the temperature detected by the temperature sensor by the timer on the controller. This second cooling rate V2 can be corrected in real time according to temperature changes, and is expressed in °C / min. The timer accurately records the elapsed time from the start of monitoring to the current moment. According to the definition of rate, rate equals the change divided by time. Here, the second cooling rate V2 is calculated by dividing the temperature detected by the temperature sensor by the timer's duration. Since it can be corrected in real time according to temperature changes, this means that as the temperature continuously changes, new temperature values ​​will be detected by the temperature sensor. This allows the calculated cooling rate to be continuously adjusted based on real-time temperature changes, making it more accurately reflect the actual cooling situation.

[0087] Specifically, calculating the first heating time for the compressor oil sump to rise from the preheating start-up temperature to the preheating stop temperature based on the first heating rate includes:

[0088] The preheating cutoff temperature is preset and denoted as T. 预热截止温度 Calculate the first heating time Δt3 using the following formula:

[0089] Δt3=(T 预热截止温度 -T 油池2 ) / V3;

[0090] Among them, T 油池2 V3 represents the preheating start-up temperature, and V3 represents the first heating rate.

[0091] Specifically, the preheating cutoff temperature is the temperature at which the compressor oil sump preheating stops.

[0092] See Figure 3 The preheating cutoff temperature can be determined based on the characteristic parameters of the lubricating oil, in °C, with a range of 5–20 °C. The characteristics of lubricating oil vary at different temperatures, and its viscosity changes with temperature. At lower temperatures, the viscosity of lubricating oil is higher and its fluidity is poorer, while as the temperature rises, the viscosity decreases and the fluidity improves. The range of 5–20 °C is set because within this temperature range, the various properties of the lubricating oil can meet the operating requirements of the equipment. If the temperature is below 5 °C, the lubricating oil may be too viscous and unable to perform its lubrication and heat dissipation functions well; while if the temperature is above 20 °C, it may cause some properties of the lubricating oil to deteriorate prematurely or exceed the optimal parameter range for normal operation of the equipment.

[0093] Furthermore, the first heating rate V3 can be experimentally tested to measure the rate of temperature rise in the compressor oil bath during heating by the compressor oil bath preheating device. In practice, the heating rate of the compressor oil bath is affected by various factors, including the power of the oil bath preheating device, the volume of the oil bath, the heat dissipation of the oil bath, and the thermal conductivity of the lubricating oil itself. In the experiment, the initial temperature of the oil bath is measured, then the preheating device is started and timing is initiated. As time progresses, the oil bath temperature continuously rises, and the corresponding oil bath temperature and first heating rate V3 at different times are recorded. Through multiple experiments under different operating conditions (such as different preheating device power, different initial oil volume in the oil bath, etc.), a more accurate first heating rate V3 can be obtained, thus providing reliable data support for the equipment preheating process.

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

[0095] Based on 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] Where T is the ambient temperature after the heat pump unit has been idle for the first preset time, T2 is the ambient temperature when the compressor oil sump enters the start-up state, V1 is the first cooling rate, and T 油池 V1 represents the oil sump temperature of the compressor oil sump after the first preset standby time of the heat pump unit, V2 represents the second cooling rate, and T represents the temperature of the compressor oil sump. 预热截止温度 V3 is the preheating cutoff temperature, and V3 is the first heating rate.

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

[0099] Understandably, the preheating start-up temperature of the compressor oil sump is calculated based on the above equation. When the temperature of the compressor oil sump reaches this temperature point, a command is sent to control the oil sump preheating device to start heating. Once the compressor oil sump preheating device is started during the standby process of the heat pump unit, the preheating start-up temperature will not be updated until the heat pump unit enters the standby state again.

[0100] Furthermore, during the standby period of the heat pump unit, once the compressor oil sump preheating device is started, the preheating start-up temperature is not updated. This is because the equipment's operating state is relatively stable during standby, and frequent adjustments to the preheating start-up temperature are unnecessary. Frequent updates to the preheating start-up temperature during this period could lead to frequent start-ups and shutdowns of the preheating device, increasing equipment wear and energy consumption. This stable preheating start-up temperature setting continues until the next standby period of the heat pump unit. This means that the preheating start-up temperature strategy is relatively fixed during each standby period throughout the entire operating cycle of the heat pump unit, which helps simplify the equipment's control logic and improves the reliability and stability of equipment operation. Simultaneously, it also facilitates equipment maintenance and management, as it eliminates the need to reassess and adjust the preheating start-up temperature during each standby period.

[0101] S300: Determine whether the oil sump temperature has reached the preheating start-up temperature, and control whether to preheat the compressor oil sump based on the determination result.

[0102] Specifically, determining whether the compressor oil sump temperature has reached the preheating start-up temperature, and determining whether to preheat the compressor oil sump based on the determination result, includes:

[0103] If the current compressor oil sump temperature reaches the preheating start-up temperature, then preheat the compressor oil sump.

[0104] If the current compressor oil sump temperature has not reached the preheating start-up temperature, the compressor oil sump will not be preheated, and the compressor oil sump temperature will continue to be monitored.

[0105] The working principle of this invention will be explained below using a room air conditioner as an example:

[0106] Assuming the outdoor ambient temperature is -10℃ and the indoor temperature is 10℃ during winter heating, the default start-up temperature difference for the heat pump unit is 3℃ and the preheating cut-off temperature is 5℃.

[0107] At this point, the ambient temperature is set to 20℃ before starting the heat pump unit. After starting, the heat pump unit enters heating operation. When the indoor ambient temperature reaches 22℃, the heat pump unit enters standby mode. Five minutes after entering standby, the temperature of the compressor oil bath collected by the sensor is 30℃. Neither the ambient temperature nor the indoor set temperature has changed. Combining the parameters detected by the sensor at this moment, and referring to the pre-calibrated compressor oil bath temperature drop rate (second cooling rate of 2℃ / min), compressor oil bath preheating temperature rise rate (first heating rate of 0.5℃ / min), and room temperature drop rate (first cooling rate of 0.2℃ / min) in the controller's built-in preheating start-up temperature calculation formula, we can obtain:

[0108]

[0109] The calculated preheating start temperature of the compressor oil sump is 4℃, meaning that the preheating device needs to be activated when the temperature of the compressor oil sump drops to 4℃.

[0110] It should be noted that this embodiment calculates the preheating start-up temperature of the compressor oil bath within the standby start-up temperature range of the heat pump unit, ensuring that the oil temperature requirement is met precisely from the start-up of the compressor oil bath to the start-up of the heat pump. This solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system. It greatly reduces the power consumption of the compressor oil bath preheating control device during standby, further ensuring the reliable operation of the compressor, avoiding continuous heating consumption during the standby period of the heat pump unit, and preventing compressor malfunctions caused by untimely activation of the compressor oil bath preheating control device. This significantly improves energy utilization and the reliable operation of the heat pump system, further extending the service life of the compressor.

[0111] Example 2

[0112] Please see Figure 2 This embodiment provides a heat pump system oil tank preheating control device, the device comprising:

[0113] Acquisition module 100: used to periodically acquire the ambient temperature of the environment where the heat pump unit is located and the oil sump temperature of the compressor oil sump of the heat pump unit after the heat pump unit is in standby mode.

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

[0115] It should be noted that this embodiment calculates the preheating start-up temperature of the compressor oil bath within the standby start-up temperature range of the heat pump unit, ensuring that the oil temperature requirement is met precisely from the start-up of the compressor oil bath to the start-up of the heat pump. This solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system. It greatly reduces the power consumption of the compressor oil bath preheating control device during standby, further ensuring the reliable operation of the compressor, avoiding continuous heating consumption during the standby period of the heat pump unit, and preventing compressor malfunctions caused by untimely activation of the compressor oil bath preheating control device. This significantly improves energy utilization and the reliable operation of the heat pump system, further extending the service life of the compressor.

[0116] Example 3

[0117] This embodiment also provides a heat pump device, which includes the heat pump system oil sump preheating control method in Embodiment 1.

[0118] The method includes periodically acquiring the ambient temperature of the environment where the heat pump unit is located and the temperature of the compressor oil bath of the heat pump unit after the heat pump unit is in standby mode; acquiring a first temperature change rate of the ambient temperature of the environment where the heat pump unit is located and a second temperature change rate of the compressor oil bath temperature; calculating the preheating start-up temperature of the compressor oil bath based on the first temperature change rate and the second temperature change rate; determining whether the compressor oil bath temperature has reached the preheating start-up temperature; and determining whether to preheat the compressor oil bath based on the determination result.

[0119] It should be noted that this embodiment provides a heat pump device that calculates the preheating start-up temperature of the compressor oil bath within the standby start-up temperature range of the heat pump unit. This ensures that the oil temperature requirement is met precisely from the start-up of the compressor oil bath to the start-up of the heat pump. This solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system. It greatly reduces the power consumption of the compressor oil bath preheating control device during standby, further ensuring the reliable operation of the compressor. It avoids the continuous heating consumption during the standby period of the heat pump unit and also avoids the compressor malfunction caused by the compressor oil bath preheating control device not starting in time. This greatly improves energy utilization and the reliable operation of the heat pump system, further extends the service life of the compressor, and significantly improves the reliability of the entire heat pump device, enabling the heat pump device to operate more stably.

[0120] Example 4

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

[0122] The computer device includes a memory and a processor. The memory stores computer-readable instructions that, when executed by the processor, implement the heat pump system oil tank preheating control method. This computer device can be broadly categorized as a server, terminal, or any other electronic device with the necessary computing and / or processing capabilities. In one embodiment, the computer device may include a processor, memory, network interface, communication interface, etc., connected via a system bus. The processor of the computer device can be used to provide the necessary computing, processing, and / or control capabilities. The memory of the computer device may include a non-volatile storage medium and internal memory. The non-volatile storage medium may store an operating system, computer programs, etc. The internal memory can provide an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface and 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, it performs the steps of the method of the present invention.

[0123] This invention can be implemented as a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, causes the steps of the methods of embodiments of the invention to be performed. In one embodiment, the computer program is distributed across multiple network-coupled computer devices or processors, such 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 executed by a single computer device or processor or by two or more computer devices or processors. One or more method steps / operations may be executed by one or more computer devices or processors, and one or more other method steps / operations may be executed by one or more other computer devices or processors. One or more computer devices or processors may execute a single method step / operation, or execute two or more method steps / operations.

[0124] It should be noted that this invention calculates the preheating start-up temperature of the compressor oil bath within the standby start-up temperature range of the heat pump unit, ensuring that the oil temperature requirement is met precisely from the start-up of the compressor oil bath to the start-up of the heat pump. This solves the technical problem of excessive energy consumption due to continuous heating of the compressor oil bath preheating device in the standby state of the heat pump system. It greatly reduces the power consumption of the compressor oil bath preheating control device during standby, further ensuring the reliable operation of the compressor, avoiding continuous heating consumption during the standby period of the heat pump unit, and preventing compressor malfunctions caused by untimely activation of the compressor oil bath preheating control device. This significantly improves energy utilization and the reliable operation of the heat pump system, further extending the service life of the compressor.

[0125] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification, provided that such combination does not contain contradictions.

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

Claims

1. A method for controlling oil tank preheating in a heat pump system, characterized in that, include: S100 After the heat pump unit is in standby mode, the ambient temperature of the environment where the heat pump unit is located and the oil sump temperature of the compressor oil sump of the heat pump unit are periodically obtained. S200. Calculate the first temperature change rate of the ambient temperature and the second temperature change rate of the oil sump temperature, and calculate the preheating start temperature for starting the compressor oil sump preheating based on the first temperature change rate and the second temperature change rate. S300: Determine whether the oil sump temperature has reached the preheating start-up temperature, and control whether to preheat the compressor oil sump based on the determination result.

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

3. The method for controlling oil sump preheating in a heat pump system according to claim 2, characterized in that, The calculation of the preheating start-up temperature for preheating the compressor oil sump based on the first temperature change rate and the second temperature change rate includes: Based on the first cooling rate, calculate the first cooling time when the ambient temperature drops to the ambient temperature when the heat pump unit enters the start-up state after the first preset standby time of the heat pump unit. Based on the second cooling rate, calculate the second cooling time when the temperature of the compressor oil bath drops to the preheating start temperature of the compressor oil bath after the first preset standby time of the heat pump unit; Based on the first heating rate, calculate the first heating time for the compressor oil sump to rise from the preheating start temperature to the preheating stop temperature. The preheating start temperature is calculated based on the first cooling time, the second cooling time, and the first heating time.

4. The method for controlling oil tank preheating in a heat pump system according to claim 3, characterized in that, The calculation of the first cooling time, based on the first cooling rate, of the ambient temperature dropping to the ambient temperature when the heat pump unit enters the start-up state after a first preset standby time, includes: A first setpoint T for the ambient temperature that pre-sets to put the heat pump unit into standby mode. 设定 And the difference in ambient temperature between standby and start-up states for the heat pump unit. T, based on the first set value T 设定 The difference between the ambient temperature and the ambient temperature T is the ambient temperature T2 when the compressor oil sump enters the start-up state. The specific calculation formula is as follows: T2 = T 设定 - T。 5. The method for controlling oil sump preheating in a heat pump system according to claim 4, characterized in that, The step of calculating the first cooling time, based on the first cooling rate, for the ambient temperature to drop to the ambient temperature when the heat pump unit enters the start-up state after a first preset standby time, further includes: Obtain the ambient temperature after the heat pump unit has been in standby for the first preset time, denoted as T, and calculate the first cooling time. The specific calculation formula for t1 is as follows: t1=(T-T2) / V1; Where V1 is the first cooling rate and T2 is the ambient temperature when the compressor oil sump enters the start-up state.

6. The method for controlling oil sump preheating in a heat pump system according to claim 5, characterized in that, The second cooling time, calculated based on the second cooling rate, for the temperature of the compressor oil bath to drop to the preheating start-up temperature of the compressor oil bath after the first preset standby time of the heat pump unit, includes: The oil sump temperature T of the compressor oil sump after the first preset standby time of the heat pump unit is obtained. 油池 Calculate the second cooling time t2, the specific calculation formula is as follows: t2 =(T 油池 -T 油池2 ) / V2; Among them, T 油池2 V1 represents the preheating start-up temperature, and V2 represents the second cooling rate.

7. The method for controlling oil tank preheating in a heat pump system according to claim 6, characterized in that, The step of calculating the first heating time for the compressor oil sump to rise from the preheating start-up temperature to the preheating stop temperature based on the first heating rate includes: The preheating cutoff temperature is preset and denoted as T. 预热截止温度 Calculate the first heating time ∆t3 using the following formula: t3=(T 预热截止温度 -T 油池2 ) / V3; Among them, T 油池2 V3 represents the preheating start-up temperature, and V3 represents the first heating rate.

8. The method for controlling oil tank preheating in a heat pump system according to claim 7, characterized in that, The preheating cutoff temperature is the temperature at which the compressor oil bath preheating stops.

9. The method for controlling oil tank preheating in a heat pump system according to claim 7, characterized in that, The calculation of the preheating start temperature based on the first cooling time, the second cooling time, and the first heating time includes: according to t1= t2+ t3, 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; Where T is the ambient temperature after the heat pump unit has been idle for the first preset time, T2 is the ambient temperature when the compressor oil sump enters the start-up state, V1 is the first cooling rate, and T 油池 V1 represents the oil sump temperature of the compressor oil sump after the first preset standby time of the heat pump unit, V2 represents the second cooling rate, and T represents the temperature of the compressor oil sump. 预热截止温度 V3 is the preheating cutoff temperature, and V3 is the first heating rate. Calculate the preheating start temperature T using the above formula. 油池2 .

10. The method for controlling oil sump preheating in a heat pump system according to claim 1, characterized in that, The step of determining whether the oil sump temperature has reached the preheating start-up temperature, and controlling whether to preheat the compressor oil sump based on the determination result, includes: If the current compressor oil sump temperature reaches the preheating start-up temperature, then preheat the compressor oil sump. If the current compressor oil sump temperature has not reached the preheating start-up temperature, the compressor oil sump will not be preheated, and the compressor oil sump temperature will continue to be monitored.

11. A heat pump system oil bath preheating control device, characterized in that, include: Acquisition module (100): used to periodically acquire the ambient temperature of the environment where the heat pump unit is located and the oil sump temperature of the compressor oil sump of the heat pump unit after the heat pump unit is in standby mode. Control module (200): used to calculate the first temperature change rate of the ambient temperature and the second temperature change rate of the oil sump temperature, and to calculate the preheating start temperature for starting the compressor oil sump preheating based on the first temperature change rate and the second temperature change rate; used to determine whether the oil sump temperature has reached the preheating start temperature, and to control whether to preheat the compressor oil sump based on the determination result.

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

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