CN114353382A - Starting control method and device of air source heat pump unit and storage medium - Google Patents

Abstract

The invention relates to the technical field of air source heat pump units, in particular provides a starting control method and device of an air source heat pump unit and a storage medium, and aims to solve the problem of how to quickly raise the water inlet temperature of a water side heat exchanger of the air source heat pump unit. For the purpose, the air source heat pump unit comprises a water side heat exchanger and a bypass pipeline, wherein one end of the bypass pipeline is connected with a water inlet of the water side heat exchanger, and the other end of the bypass pipeline is connected with a water outlet of the water side heat exchanger. The starting control method comprises the following steps: acquiring the actual inlet water temperature of a water inlet of a water side heat exchanger; judging whether the actual inlet water temperature is less than or equal to a preset temperature threshold value or not; if so, controlling part of water output by the water outlet of the water side heat exchanger to flow back to the water inlet of the water side heat exchanger through the bypass pipeline so as to improve the actual inlet water temperature of the water inlet. The water inlet temperature of the water side heat exchanger can be increased by returning the water at the water outlet which has been subjected to heat exchange by the water side heat exchanger to the water inlet of the water side heat exchanger.

Description

Start-up control method, device and storage medium of air source heat pump unit

technical field

The invention relates to the technical field of air source heat pump units, and in particular provides a startup control method, device and storage medium of an air source heat pump unit.

Background technique

The air source heat pump unit can absorb the heat in the air through its own refrigerant circulation system to heat the water. Generally speaking, when the air source heat pump unit is turned on for the first time, the temperature of the water in the water pipe is relatively low. Under this premise, the low temperature of the water leads to a lower exhaust temperature of the refrigerant circulation system, which is used for supplementing air to increase enthalpy. Generally, only when the exhaust temperature is higher than a certain value will the compressor start to increase the enthalpy of the air supply. If the water temperature is always in a low state, the compressor cannot start the function of the air supply to increase the enthalpy, and the heating capacity of the air source heat pump unit and the coefficient of performance will be greatly affected, resulting in a slower rise in water temperature. In addition, when the water temperature is low, the evaporation temperature is generally low, which is easy to cause frosting on the fins of the heat exchanger, and the air source heat pump unit will frequently defrost, which will also cause the water temperature to rise slowly.

Correspondingly, there is a need in the art for a new startup control solution for an air source heat pump unit to solve the above problems.

SUMMARY OF THE INVENTION

The present invention aims to solve the above technical problem, namely, to solve or at least partially solve the problem of how to rapidly increase the inlet water temperature of the water side heat exchanger of the air source heat pump unit when the air source heat pump unit is started.

In a first aspect, the present invention provides a start-up control method for an air source heat pump unit, the air source heat pump unit includes a water-side heat exchanger, the air source heat pump unit further includes a bypass pipeline, and the bypass pipeline One end of the pipe is connected to the water inlet of the water-side heat exchanger, and the other end of the bypass pipeline is connected to the water outlet of the water-side heat exchanger. The method includes:

Obtain the actual inlet water temperature of the water inlet of the water side heat exchanger;

Judging whether the actual inlet water temperature is less than or equal to a preset temperature threshold;

If so, a part of the water output from the water outlet of the water-side heat exchanger is controlled to return to the water inlet of the water-side heat exchanger through the bypass pipeline, so as to increase the actual inlet water temperature of the water inlet.

In a technical solution of the above-mentioned start-up control method of the air source heat pump unit, the bypass pipeline is provided with an electric regulating valve for adjusting the water flow rate in the bypass pipeline, "controlling the water-side heat exchanger" The step of returning a part of the water output from the water outlet to the water inlet of the water-side heat exchanger through the bypass pipeline specifically includes:

According to the temperature difference between the target inlet water temperature and the actual inlet water temperature, the opening of the electric regulating valve is adjusted to control a part of the water output from the water outlet of the water side heat exchanger to return through the bypass pipeline to the water inlet of the water side heat exchanger.

In a technical solution of the above-mentioned start-up control method for an air source heat pump unit, the step of "adjusting the opening of the electric control valve according to the temperature difference between the target inlet water temperature and the actual inlet water temperature" specifically includes:

For each opening adjustment cycle, obtain the temperature difference between the target inlet water temperature and the actual inlet water temperature of the water inlet in the current opening adjustment cycle, and open the electric control valve in the previous opening adjustment cycle. The actual opening of the electric control valve after the degree adjustment;

If the temperature difference is greater than zero, the actual opening degree is increased according to the opening degree adjustment amount corresponding to the temperature difference;

If the temperature difference is less than zero, the actual opening degree is decreased according to the opening degree adjustment amount corresponding to the temperature difference.

In a technical solution of the above-mentioned start-up control method for an air source heat pump unit, when the temperature difference is greater than zero, the method further includes obtaining the opening adjustment amount corresponding to the temperature difference through the following steps:

If the temperature difference is greater than a preset temperature difference threshold, directly use the opening adjustment amount corresponding to the preset temperature difference threshold as the opening adjustment amount corresponding to the temperature difference;

If the temperature difference is greater than a plurality of preset different temperature difference thresholds, selecting the opening adjustment amount corresponding to the largest temperature difference threshold as the opening adjustment amount corresponding to the temperature difference;

Wherein, the size of the preset temperature difference threshold is positively correlated with the size of the opening adjustment amount;

and/or,

When the temperature difference is less than zero, the method further includes obtaining the opening degree adjustment amount corresponding to the temperature difference through the following steps:

If the temperature difference is less than the first temperature difference threshold and greater than or equal to the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is a preset opening adjustment amount;

If the temperature difference is smaller than the second temperature difference threshold, the opening degree adjustment amount corresponding to the temperature difference is determined according to the actual opening degree of the electric control valve, so as to reduce the opening degree adjustment amount according to the opening degree adjustment amount. After the actual opening, close the electric regulating valve.

In a second aspect, the present invention provides a start-up control device for an air source heat pump unit, the air source heat pump unit includes a water-side heat exchanger, and it is characterized in that the air source heat pump unit further includes a bypass pipeline, and the One end of the bypass pipeline is connected to the water inlet of the water-side heat exchanger, and the other end of the bypass pipeline is connected to the water outlet of the water-side heat exchanger. The device includes:

a water temperature acquisition module, which is configured to acquire the actual inlet water temperature of the water inlet of the water-side heat exchanger;

a water temperature judgment module, configured to judge whether the actual inlet water temperature is less than or equal to a preset temperature threshold;

The water outlet return module is configured to control a part of the water output from the water outlet of the water side heat exchanger to return to the water inlet of the water side heat exchanger through the bypass pipeline, so as to improve the water inlet of the water inlet. Actual inlet water temperature.

In a technical solution of the above-mentioned start-up control device for an air source heat pump unit, the bypass pipeline is provided with an electric regulating valve for adjusting the water flow in the bypass pipeline, and the water outlet return module is further configured to execute The following actions:

According to the temperature difference between the target inlet water temperature and the actual inlet water temperature, the opening of the electric regulating valve is adjusted to control a part of the water output from the water outlet of the water side heat exchanger to return through the bypass pipeline to the water inlet of the water side heat exchanger.

In a technical solution of the above-mentioned start-up control device for an air source heat pump unit, the effluent return module further includes an electric regulating valve opening degree adjustment sub-module, and the electric regulating valve opening degree adjustment module is further configured to perform the following operations:

For each opening adjustment cycle, obtain the temperature difference between the target inlet water temperature and the actual inlet water temperature of the water inlet in the current opening adjustment cycle, and open the electric control valve in the previous opening adjustment cycle. The actual opening of the electric control valve after the degree adjustment;

If the temperature difference is greater than zero, the actual opening degree is increased according to the opening degree adjustment amount corresponding to the temperature difference;

If the temperature difference is less than zero, the actual opening degree is decreased according to the opening degree adjustment amount corresponding to the temperature difference.

In a technical solution of the above-mentioned start-up control device for an air source heat pump unit, when the temperature difference is greater than zero, the electric regulating valve opening adjustment sub-module is further configured to obtain the corresponding temperature difference by performing the following steps. Opening adjustment amount:

If the temperature difference is greater than a preset temperature difference threshold, directly use the opening adjustment amount corresponding to the preset temperature difference threshold as the opening adjustment amount corresponding to the temperature difference;

If the temperature difference is greater than a plurality of preset different temperature difference thresholds, selecting the opening adjustment amount corresponding to the largest temperature difference threshold as the opening adjustment amount corresponding to the temperature difference;

Wherein, the size of the preset temperature difference threshold is positively correlated with the size of the opening adjustment amount;

and/or,

When the temperature difference is less than zero, the electric regulating valve opening degree adjustment sub-module is further configured to obtain the opening degree adjustment amount corresponding to the temperature difference by performing the following steps:

If the temperature difference is less than the first temperature difference threshold and greater than or equal to the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is a preset opening adjustment amount;

If the temperature difference is smaller than the second temperature difference threshold, the opening degree adjustment amount corresponding to the temperature difference is determined according to the actual opening degree of the electric control valve, so as to reduce the opening degree adjustment amount according to the opening degree adjustment amount. After the actual opening, close the electric regulating valve.

In a third aspect, a control device is provided, the control device comprising a processor and a storage device, the storage device being adapted to store a plurality of pieces of program code, the program code being adapted to be loaded and run by the processor to execute the above air The start-up control method for an air source heat pump unit described in any one of the technical solutions for the start-up control method for a source heat pump unit.

In a fourth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a plurality of program codes, and the program codes are adapted to be loaded and run by a processor to execute the startup control method of the above-mentioned air source heat pump unit. The start-up control method of the air source heat pump unit described in any one of the technical solutions.

In the case of adopting the above technical solutions, the present invention can connect the water inlet and the water outlet of the water side heat exchanger through a bypass pipeline, and then determine that the actual inlet water temperature of the water side heat exchanger is less than or equal to a preset temperature. At the temperature threshold, part of the water output from the water-side heat exchanger outlet is returned to the water-side heat exchanger inlet through the bypass pipe. That is to say, the temperature of the water output from the water outlet of the water side heat exchanger is higher than that of the water input from the water inlet of the water side heat exchanger. Therefore, part of the water output from the water outlet of the water side heat exchanger is passed through The bypass pipe is returned to the water inlet of the water side heat exchanger, which can quickly increase the inlet water temperature of the water side heat exchanger of the air source heat pump unit when the air source heat pump unit is started.

Description of drawings

The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It can be easily understood by those skilled in the art that these drawings are only for the purpose of illustration, and are not intended to limit the protection scope of the present invention. In addition, like numerals in the figures are used to designate like parts, where:

1 is a schematic flow chart of the main steps of a start-up control method for an air source heat pump unit according to an embodiment of the present invention;

2 is a schematic structural diagram of an air source heat pump unit according to a start-up control method for an air source heat pump unit according to an embodiment of the present invention;

Fig. 3 is a schematic block diagram of the main structure of a start-up control device of an air source heat pump unit according to an embodiment of the present invention.

List of reference numbers :

21: Water side heat exchanger; 22: Bypass pipeline; 23: Temperature sensor; 24: Electric regulating valve; 25: Temperature sensor;

31: water temperature acquisition module; 32: water temperature judgment module; 33: water outlet return module.

Detailed ways

Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

In the description of the present invention, "module" and "processor" may include hardware, software or a combination of both. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-transitory computer-readable storage media include any suitable media that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like.

Referring to Figures 1 and 2, Figure 1 is a schematic flowchart of the main steps of a start-up control method for an air source heat pump unit according to an embodiment of the present invention, and Figure 2 is a schematic structural diagram of an air source heat pump unit in an embodiment of the present invention. As shown in Figure 2, the air source heat pump unit in this embodiment includes a water-side heat exchanger 21 and a bypass pipeline 22. One end of the bypass pipeline 22 is connected to the water inlet of the water-side heat exchanger 21, and the bypass is The other end of the pipeline 22 is connected to the water outlet of the water-side heat exchanger 21 . The startup control method of the air source heat pump unit in the embodiment of the present invention mainly includes the following steps S101-S103.

Step S101 : Obtain the actual inlet water temperature of the water inlet of the water-side heat exchanger 21 .

The water-side heat exchanger 21 refers to a heat exchanger for exchanging heat with water in the air source heat pump unit.

The actual inlet water temperature refers to the temperature of the water input into the water-side heat exchanger 21 .

Continuing to refer to FIG. 2 , in one implementation of this embodiment, a temperature sensor 23 and a temperature sensor 25 may be provided at the water inlet and outlet of the water-side heat exchanger 21 respectively, and the water-side heat exchanger 21 can be obtained through the temperature sensor 23 . The actual water inlet temperature of the water inlet of the water side heat exchanger can be checked in real time, and the actual water outlet temperature of the water outlet of the water side heat exchanger 21 can be obtained through the temperature sensor 25 to check the actual water inlet temperature of the water side heat exchanger 21 in real time. The actual outlet water temperature of the water outlet of the heater, the actual outlet water temperature refers to the temperature of the water output by the water-side heat exchanger 21 .

Step S102: Determine whether the actual inlet water temperature is less than or equal to a preset temperature threshold, if yes, go to Step S103, if not, go back to Step S101.

In an implementation of this embodiment, a temperature threshold can be preset. If the actual inlet water temperature is greater than the temperature threshold, it is determined that the inlet water temperature of the water-side heat exchanger 21 does not need to be raised at present. If the actual inlet water temperature If it is less than or equal to the temperature threshold, it is determined that the current inlet water temperature of the water-side heat exchanger 21 is too low, and the inlet water temperature of the water-side heat exchanger 21 needs to be increased. For example, if the temperature threshold is set to 30°C, if the current actual inlet water temperature is 20°C, it can be determined that the actual inlet water temperature is lower than the preset temperature threshold.

Step S103: Control a part of the water output from the water outlet of the water side heat exchanger 21 to return to the water inlet of the water side heat exchanger 21 through the bypass pipeline 22 to increase the actual water inlet temperature of the water inlet.

After it is determined that the actual inlet water temperature of the water-side heat exchanger 21 is less than or equal to the preset temperature threshold, a part of the water output from the water outlet of the water-side heat exchanger 21 can be controlled to return to the water-side heat exchange through the bypass line 22 Even if the water at the water outlet of the water side heat exchanger 21 and the water input from the water inlet of the water side heat exchanger 21 merge, the actual inlet water temperature of the water side heat exchanger 21 will be raised after the merging.

Continuing to refer to FIG. 2 , in an implementation of this embodiment, the bypass pipeline 22 may also be provided with an electric regulating valve 24 for adjusting the water flow in the bypass pipeline 22 , and step S103 may specifically include:

According to the temperature difference between the target inlet water temperature and the actual inlet water temperature, the opening of the electric regulating valve 24 is adjusted to control a part of the water output from the water outlet of the water side heat exchanger 21 to return to the water side heat exchange through the bypass pipeline 22 The water inlet of the device 21.

Specifically, another target inlet water temperature may be set, and the target inlet water temperature refers to the water temperature value to which the actual inlet water temperature of the water-side heat exchanger needs to be raised. The target inlet water temperature may be the same as or different from the above-mentioned preset temperature threshold. For example, the target inlet water temperature and the preset temperature threshold may be set to 30°C, or the target inlet water temperature may be set to 40°C. °C, set the preset temperature threshold to 30 °C, etc.

The opening of the electric regulating valve 24 can be adjusted according to the temperature difference between the target inlet water temperature and the actual inlet water temperature. For example, if the actual inlet water temperature is 10°C and the target inlet water temperature is 40°C, then obviously the temperature difference is 30°C, yes. It is relatively large, so the opening of the electric regulating valve 24 can be adjusted to be relatively large, for example, the opening of the electric regulating valve 24 can be adjusted to be half of the maximum opening of the electric regulating valve 24, etc.; for example, suppose the actual inlet water temperature is 38°C, the target inlet water temperature is 40°C, then obviously the temperature difference is 2°C, which is relatively small, so the opening of the electric control valve 24 can be adjusted to be smaller, for example, the opening of the electric control valve 24 is set to electric One-tenth of the maximum opening degree of the regulating valve 24 and so on. Adjusting the opening of the electric regulating valve 24 according to different temperature differences can control the water flow more accurately, so that the actual inlet water temperature can more accurately approach or reach the target inlet water temperature.

In an implementation of this embodiment, the step of “adjusting the opening of the electric regulating valve 24 according to the temperature difference between the target inlet water temperature and the actual inlet water temperature” may specifically include:

For each opening adjustment period, the temperature difference between the target inlet water temperature and the actual inlet water temperature in the current opening adjustment period is obtained, and after the opening adjustment of the electric control valve 24 is performed in the previous opening adjustment period The actual opening of the electric control valve 24 .

If the temperature difference is greater than zero, increase the actual opening according to the opening adjustment amount corresponding to the temperature difference.

If the temperature difference is less than zero, reduce the actual opening according to the opening adjustment amount corresponding to the temperature difference.

(假设N为电动调节阀24的最大开度)；在到达下一个预设的调节周期后(假设每个调节周期为10秒钟)，即10秒钟之后再次获取实际进水温度，然后确定目标进水温度与实际进水温度的温度差，再获取上一个开度调节周期对电动调节阀24进行开度调节后电动调节阀24的实际开度，假设温度差大于零，则可以继续增大电动调节阀24的实际开度，例如前一个开度调节周期对电动调节阀24进行开度调节后电动调节阀24的实际开度为

根据温度差对应的开度调节量将电动调节阀24的开度增大

即对电动调节阀24进行开度调节后电动调节阀的实际开度为

Specifically, the process of adjusting the opening degree of the electric regulating valve 24 can be divided into multiple adjustment cycles. For example, after detecting that the actual inlet water temperature is less than or equal to a preset temperature threshold, first determine the target inlet water temperature and the actual inlet water temperature. and then adjust the opening of the electric control valve 24 according to the temperature difference, for example, adjust the actual opening of the electric control valve to

(Assume N is the maximum opening of the electric control valve 24); after reaching the next preset adjustment period (assuming that each adjustment period is 10 seconds), that is, after 10 seconds, obtain the actual inlet water temperature again, and then determine The temperature difference between the target inlet water temperature and the actual inlet water temperature, and then obtain the actual opening degree of the electric regulating valve 24 after the opening adjustment of the electric regulating valve 24 in the previous opening adjustment cycle. If the temperature difference is greater than zero, it can continue to increase. The actual opening degree of the large electric control valve 24, for example, the actual opening degree of the electric control valve 24 after the opening degree of the electric control valve 24 is adjusted in the previous opening adjustment cycle is:

The opening degree of the electric regulating valve 24 is increased according to the opening degree adjustment amount corresponding to the temperature difference

That is, the actual opening degree of the electric control valve after the opening degree of the electric control valve 24 is adjusted is:

即对电动调节阀24进行开度调节后电动调节阀24的实际开度为

如果温度差已经小于零，则说明此时实际进水温度已经大于目标进水温度了，则可以减小电动调节阀24的实际开度，即实际上减少了从水侧换热器21的出水口经旁通管路22回流至水侧换热器21的进水口的水流量。Similarly, if the temperature difference is less than zero, the actual opening degree can be reduced according to the opening degree adjustment amount corresponding to the temperature difference, for example, the actual opening degree of the electric control valve 24 can be reduced according to the opening degree adjustment amount corresponding to the temperature difference

That is, the actual opening degree of the electric control valve 24 after the opening degree of the electric control valve 24 is adjusted is:

If the temperature difference is already less than zero, it means that the actual inlet water temperature is already greater than the target inlet water temperature, and the actual opening of the electric regulating valve 24 can be reduced, that is, the outlet from the water-side heat exchanger 21 is actually reduced. The water flow rate of the water outlet returning to the water inlet of the water-side heat exchanger 21 through the bypass pipeline 22 .

在到达第二个预设的调节周期后，再根据温度差确定电动调节阀24的开度调节量。In addition, in order to make the process of adjusting the opening of the electric control valve 24 more convenient, in the first adjustment cycle, that is, after it is first determined that the actual inlet water temperature is less than or equal to the preset temperature threshold, the opening of the electric control valve 24 can be directly adjusted. To a certain fixed opening, for example, after detecting that the actual inlet water temperature is less than or equal to the preset temperature threshold, the opening adjustment amount of the electric control valve 24 is not determined according to the temperature difference, but the opening degree of the electric control valve 24 is directly adjusted. value adjusted to

After reaching the second preset adjustment period, the adjustment amount of the opening degree of the electric adjustment valve 24 is determined according to the temperature difference.

Through the above method, different methods of adjusting the opening degree of the electric regulating valve 24 are adopted for different temperature differences, so that the actual inlet water temperature can quickly and accurately approach or reach the target inlet water temperature.

In an implementation of this embodiment, when the temperature difference is greater than zero, the start-up control method of the air source heat pump unit may further include obtaining the opening adjustment amount corresponding to the temperature difference through the following steps:

If the temperature difference is greater than a preset temperature difference threshold, the opening adjustment amount corresponding to the preset temperature difference threshold is directly used as the opening adjustment amount corresponding to the temperature difference.

If the temperature difference is greater than a plurality of preset different temperature difference thresholds, the opening adjustment amount corresponding to the largest temperature difference threshold is selected as the opening adjustment amount corresponding to the temperature difference. In this embodiment, the size of the preset temperature difference threshold has a positive correlation with the size of the opening adjustment amount, that is, the larger the preset temperature difference threshold value is, the larger the opening adjustment amount is, and the preset temperature difference The smaller the value of the threshold value, the smaller the value of the opening adjustment amount.

当温度差大于5℃时，电动调节阀24的开度调节量为

当温度差大于10℃时，电动调节阀24的开度调节量为

当温度差大于15℃时，电动调节阀24的开度调节量为

当温度差大于20℃时，电动调节阀24的开度调节量为

Specifically, the larger the temperature difference, the larger the gap between the target inlet water temperature and the actual inlet water temperature, indicating that the actual inlet water temperature is too low, and the actual inlet water temperature needs to be raised as soon as possible. Multiple temperature difference thresholds can be set. The opening adjustment amount of the electric regulating valve 24 corresponding to the temperature difference threshold is different. The larger the temperature difference is, the larger the opening adjustment amount of the electric regulating valve 24 will be, and the water will flow back from the water outlet of the water side heat exchanger 21 through the bypass pipeline 22 The more water reaches the water inlet of the water-side heat exchanger 21, the more significant the effect of increasing the actual inlet water temperature is. See Table 1 below, for example, when the temperature difference is greater than 0°C, the opening adjustment amount of the electric control valve 24 is

When the temperature difference is greater than 5°C, the opening adjustment amount of the electric control valve 24 is

When the temperature difference is greater than 10°C, the opening adjustment amount of the electric control valve 24 is

When the temperature difference is greater than 15°C, the opening adjustment amount of the electric regulating valve 24 is

When the temperature difference is greater than 20°C, the opening adjustment amount of the electric control valve 24 is

Table 1

作为2℃对应的开度调节量；假设温度差为14℃，可以看出，温度差大于多个预设的温度差阈值，所以可以选取最大的温度差阈值，即将

作为14℃对应的开度调节量。Assuming that the temperature difference is 2°C, it can be seen that if the temperature difference is greater than the preset temperature difference threshold of 0°C, it can be

As the opening adjustment amount corresponding to 2°C; assuming that the temperature difference is 14°C, it can be seen that the temperature difference is greater than a plurality of preset temperature difference thresholds, so the maximum temperature difference threshold can be selected, which is about

As the opening adjustment amount corresponding to 14°C.

Through the above method, when the temperature difference is greater than zero, different opening adjustment methods of the electric control valve 24 can be used to rapidly increase the actual inlet water temperature, and because different temperature differences correspond to different openings of the electric control valve 24 The adjustment amount of the temperature can be adjusted to make the adjustment method of the actual inlet water temperature more accurate.

In an implementation of this embodiment, when the temperature difference is less than zero, the start-up control method of the air source heat pump unit may further include obtaining the opening adjustment amount corresponding to the temperature difference through the following steps:

If the temperature difference is less than the first temperature difference threshold and greater than or equal to the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is the preset opening adjustment amount.

If the temperature difference is less than the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is determined according to the actual opening degree of the electric control valve, so as to close the electric control valve after reducing the actual opening degree according to the opening adjustment amount.

当温度差小于零，但是大于等于第一温度差阈值时，也可以设置一个开度调节量，例如将开度调节量设置为

等等。When the temperature difference is less than zero, the opening adjustment amount of the electric regulating valve 24 can also be determined according to different temperature differences. On the premise that the temperature difference is less than zero, the smaller the temperature difference is, the higher the actual inlet water temperature is. The smaller the opening adjustment of the electric control valve 24 is, if the temperature difference is less than a certain degree, the water from the water outlet of the water-side heat exchanger 21 can no longer be returned to the water-side heat exchanger 21 through the bypass line 22 the water inlet. For example, the first temperature difference threshold can be set to -2°C, the second temperature difference threshold can be set to -5°C, and when the temperature difference is less than -2°C and greater than or equal to -5°C, the opening adjustment of the electric control valve for

When the temperature difference is less than zero, but greater than or equal to the first temperature difference threshold, an opening adjustment amount can also be set, for example, the opening adjustment amount can be set to

and many more.

又例如在某个调节周期确定出温度差为-6℃，则可以获取当前电动调节阀24的实际开度，假设为

然后将

作为开度调节量，将电动调节阀24的实际开度减小

即实际上直接关闭电动调节阀。Assuming that a certain adjustment cycle determines that the temperature difference is -3°C, then N/5 can be used as the opening adjustment amount of the electric control valve 24 to reduce the actual opening of the electric control valve 24

For another example, if the temperature difference is determined to be -6°C in a certain adjustment period, the actual opening degree of the current electric control valve 24 can be obtained, assuming that

followed by

The actual opening degree of the electric control valve 24 is decreased as the opening adjustment amount

That is, the electric regulating valve is actually closed directly.

Through the above method, the opening adjustment amount of the electric control valve 24 can be determined according to different situations when the temperature difference is less than zero, and when the temperature difference is less than a certain degree, the electric control valve 24 can be closed in time to stop adjusting the actual inlet water temperature. , so that the method for adjusting the opening degree of the electric regulating valve 24 is more accurate and effective.

It should be noted that, all the above embodiments and the temperature, threshold and opening adjustment amount involved in the examples are only exemplary descriptions for explaining the corresponding embodiments. Those skilled in the art should understand that those skilled in the art It can be freely determined according to the actual situation or actual demand, such as setting other temperature difference thresholds according to the actual demand and so on.

Based on the above steps S101 to S103, the present invention can connect the water inlet and the water outlet of the water side heat exchanger 21 through a bypass pipeline, and then determine that the actual inlet water temperature of the water side heat exchanger 21 is less than or equal to a preset value When the temperature threshold is reached, part of the water output from the water outlet of the water side heat exchanger 21 is returned to the water inlet of the water side heat exchanger 21 through the bypass pipe 22. The heat exchanger 21 exchanges heat, that is to say, the water temperature of the water output from the water outlet of the water side heat exchanger 21 is higher than the water temperature of the water input from the water inlet of the water side heat exchanger 21. Therefore, the heat exchange on the water side is A part of the water output from the water outlet of the heat exchanger 21 is returned to the water inlet of the water-side heat exchanger 21 through the bypass pipe 22, so that the inlet water temperature of the air source heat pump unit can be rapidly increased when the air source heat pump unit is started.

It should be pointed out that, although the steps in the above embodiments are described in a specific sequence, those skilled in the art can understand that in order to achieve the effect of the present invention, different steps do not necessarily need to be executed in such an order. It may be performed simultaneously (in parallel) or in other sequences, and these variations are within the scope of the present invention.

Further, the present invention also provides a start-up control device for an air source heat pump unit.

Referring to FIG. 3 , FIG. 3 is a main structural block diagram of a start-up control device for an air source heat pump unit according to an embodiment of the present invention. As shown in FIG. 3 , the startup control device of the air source heat pump unit in the embodiment of the present invention mainly includes a water temperature acquisition module 31 , a water temperature judgment module 32 and an outlet water return module 33 . In some embodiments, one or more of the water temperature acquisition module 31 , the water temperature judgment module 32 and the water outlet return module 33 may be combined into one module. In some embodiments, the water temperature acquisition module 31 may be configured to acquire the actual inlet water temperature of the water inlet of the water side heat exchanger. The water temperature determination module 32 may be configured to determine whether the actual inlet water temperature is less than or equal to a preset temperature threshold. The outlet water return module 33 may be configured to control a part of the water output from the water outlet of the water side heat exchanger to return to the water inlet of the water side heat exchanger through the bypass pipeline, so as to increase the actual inlet water temperature of the water inlet. In one embodiment, for the description of the specific implementation function, reference may be made to the descriptions in steps S101 to S103.

In one embodiment, the bypass pipeline is provided with an electric regulating valve for adjusting the water flow in the bypass pipeline, and the water outlet return module is further configured to perform the following operations:

According to the temperature difference between the target inlet water temperature and the actual inlet water temperature, the opening of the electric regulating valve is adjusted to control a part of the water output from the water outlet of the water side heat exchanger to return to the inlet of the water side heat exchanger through the bypass pipeline. water outlet.

In one embodiment, the outlet water return module may further include a sub-module for adjusting the opening degree of the electric regulating valve, and the opening degree adjusting module for the electric regulating valve is further configured to perform the following operations:

For each opening adjustment cycle, obtain the temperature difference between the target inlet water temperature and the actual inlet water temperature in the current opening adjustment cycle, and adjust the opening of the electric control valve in the previous opening adjustment cycle. The actual opening of the regulating valve;

If the temperature difference is greater than zero, increase the actual opening according to the opening adjustment corresponding to the temperature difference;

If the temperature difference is less than zero, reduce the actual opening according to the opening adjustment corresponding to the temperature difference;

The size of the preset temperature difference threshold has a positive correlation with the size of the opening adjustment amount.

In one embodiment, when the temperature difference is greater than zero, the electric regulating valve opening adjustment sub-module may also be configured to obtain the opening adjustment amount corresponding to the temperature difference by performing the following steps:

If the temperature difference is greater than a preset temperature difference threshold, the opening adjustment amount corresponding to the preset temperature difference threshold is directly used as the opening adjustment amount corresponding to the temperature difference.

If the temperature difference is greater than a plurality of preset different temperature difference thresholds, the opening adjustment amount corresponding to the largest temperature difference threshold is selected as the opening adjustment amount corresponding to the temperature difference.

In one embodiment, when the temperature difference is less than zero, the electric regulating valve opening adjustment sub-module may be further configured to obtain the opening adjustment corresponding to the temperature difference by performing the following steps:

If the temperature difference is less than the first temperature difference threshold and greater than or equal to the second temperature difference threshold, the opening degree adjustment amount corresponding to the temperature difference is the preset opening degree adjustment amount.

If the temperature difference is less than the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is determined according to the actual opening degree of the electric control valve, so as to close the electric control valve after reducing the actual opening degree according to the opening adjustment amount.

The start-up control device of the above-mentioned air source heat pump unit is used to implement the embodiment of the start-up control method of the air source heat pump unit shown in FIG. Technicians can clearly understand that, for the convenience and conciseness of the description, the specific working process and related instructions of the start-up control device of the air-source heat pump unit can refer to the content described in the embodiment of the start-up control method of the air-source heat pump unit. It is not repeated here.

Those skilled in the art can understand that all or part of the process in the method for implementing the above-mentioned embodiment of the present invention can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer-readable In the storage medium, when the computer program is executed by the processor, the steps of the foregoing method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier Signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer-readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, computer-readable Storage media exclude electrical carrier signals and telecommunications signals.

Further, the present invention also provides a control device. In an embodiment of the control device according to the present invention, the control device includes a processor and a storage device, the storage device may be configured to store a program for executing the start-up control method of the air source heat pump unit of the above method embodiment, and the processor may be configured The program is used to execute the program in the storage device, the program includes but is not limited to the program for executing the start-up control method of the air source heat pump unit according to the above method embodiment. For the convenience of description, only the parts related to the embodiments of the present invention are shown, and the specific technical details are not disclosed, please refer to the method part of the embodiments of the present invention. The control device may be a control device device formed including various electronic devices.

Further, the present invention also provides a computer-readable storage medium. In an embodiment of the computer-readable storage medium according to the present invention, the computer-readable storage medium may be configured to store a program for executing the start-up control method of the air source heat pump unit according to the above method embodiment, and the program may be loaded by the processor and executed. Operation to realize the above-mentioned start-up control method of the air source heat pump unit. For the convenience of description, only the parts related to the embodiments of the present invention are shown, and the specific technical details are not disclosed, please refer to the method part of the embodiments of the present invention. The computer-readable storage medium may be a storage device device formed by various electronic devices. Optionally, the computer-readable storage medium in this embodiment of the present invention is a non-transitory computer-readable storage medium.

Further, it should be understood that since the setting of each module is only for describing the functional units of the apparatus of the present invention, the physical device corresponding to these modules may be the processor itself, or a part of software in the processor, a part of hardware, or Part of the combination of software and hardware. Therefore, the numbers of the various modules in the figures are merely schematic.

Those skilled in the art can understand that each module in the device can be split or combined adaptively. Such splitting or merging of specific modules will not cause the technical solutions to deviate from the principles of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.

So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. a start-up control method of an air source heat pump unit, the air source heat pump unit comprises a water-side heat exchanger, it is characterized in that, the air source heat pump unit also comprises a bypass pipeline, the One end is connected to the water inlet of the water-side heat exchanger, and the other end of the bypass pipeline is connected to the water outlet of the water-side heat exchanger, and the method includes: Obtain the actual inlet water temperature of the water inlet of the water side heat exchanger; Judging whether the actual inlet water temperature is less than or equal to a preset temperature threshold; If so, a part of the water output from the water outlet of the water-side heat exchanger is controlled to return to the water inlet of the water-side heat exchanger through the bypass pipeline, so as to increase the actual inlet water temperature of the water inlet. 2. The start-up control method of an air source heat pump unit according to claim 1, characterized in that, an electric regulating valve for adjusting the water flow in the bypass pipeline is provided on the bypass pipeline, "controlling the water flow in the bypass pipeline". The step of returning a part of the water output from the water outlet of the water side heat exchanger to the water inlet of the water side heat exchanger through the bypass pipeline specifically includes: According to the temperature difference between the target inlet water temperature and the actual inlet water temperature, the opening of the electric regulating valve is adjusted to control a part of the water output from the water outlet of the water side heat exchanger to return through the bypass pipeline to the water inlet of the water side heat exchanger. 3. The start-up control method of an air source heat pump unit according to claim 2, characterized in that, "adjust the opening degree of the electric control valve according to the temperature difference between the target inlet water temperature and the actual inlet water temperature". The steps include: For each opening adjustment cycle, obtain the temperature difference between the target inlet water temperature and the actual inlet water temperature of the water inlet in the current opening adjustment cycle, and open the electric control valve in the previous opening adjustment cycle. The actual opening of the electric control valve after the degree adjustment; If the temperature difference is greater than zero, the actual opening degree is increased according to the opening degree adjustment amount corresponding to the temperature difference; If the temperature difference is less than zero, the actual opening degree is decreased according to the opening degree adjustment amount corresponding to the temperature difference. 4. The start-up control method of an air source heat pump unit according to claim 3, wherein when the temperature difference is greater than zero, the method further comprises obtaining the opening adjustment amount corresponding to the temperature difference through the following steps : If the temperature difference is greater than a preset temperature difference threshold, directly use the opening adjustment amount corresponding to the preset temperature difference threshold as the opening adjustment amount corresponding to the temperature difference; If the temperature difference is greater than a plurality of preset different temperature difference thresholds, selecting the opening adjustment amount corresponding to the largest temperature difference threshold as the opening adjustment amount corresponding to the temperature difference; Wherein, the size of the preset temperature difference threshold is positively correlated with the size of the opening adjustment amount; and/or, When the temperature difference is less than zero, the method further includes obtaining the opening degree adjustment amount corresponding to the temperature difference through the following steps: If the temperature difference is less than the first temperature difference threshold and greater than or equal to the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is a preset opening adjustment amount; If the temperature difference is smaller than the second temperature difference threshold, the opening degree adjustment amount corresponding to the temperature difference is determined according to the actual opening degree of the electric control valve, so as to reduce the opening degree adjustment amount according to the opening degree adjustment amount. After the actual opening, close the electric regulating valve. 5. A startup control device for an air source heat pump unit, characterized in that the air source heat pump unit includes a water-side heat exchanger, characterized in that the air source heat pump unit further includes a bypass pipeline, and the bypass One end of the through pipeline is connected to the water inlet of the water side heat exchanger, and the other end of the bypass pipeline is connected to the water outlet of the water side heat exchanger. The device includes: a water temperature acquisition module, which is configured to acquire the actual inlet water temperature of the water inlet of the water side heat exchanger; a water temperature judgment module, which is configured to judge whether the actual inlet water temperature is less than or equal to a preset temperature threshold; The water outlet return module is configured to control a part of the water output from the water outlet of the water side heat exchanger to return to the water inlet of the water side heat exchanger through the bypass pipeline, so as to improve the water inlet of the water inlet. Actual inlet water temperature. 6 . The start-up control device for an air source heat pump unit according to claim 5 , wherein the bypass pipeline is provided with an electric regulating valve for adjusting the water flow in the bypass pipeline, and the effluent water returns. 7 . The module is further configured to perform the following operations: According to the temperature difference between the target inlet water temperature and the actual inlet water temperature, the opening of the electric regulating valve is adjusted to control a part of the water output from the water outlet of the water side heat exchanger to return through the bypass pipeline to the water inlet of the water side heat exchanger. 7 . The start-up control device for an air source heat pump unit according to claim 6 , wherein the water outlet and return module further comprises an electric regulating valve opening degree adjustment sub-module, and the electric regulating valve opening degree adjustment module is further configured. 8 . to do the following: For each opening adjustment cycle, obtain the temperature difference between the target inlet water temperature and the actual inlet water temperature of the water inlet in the current opening adjustment cycle, and open the electric control valve in the previous opening adjustment cycle. The actual opening of the electric control valve after the degree adjustment; If the temperature difference is greater than zero, the actual opening degree is increased according to the opening degree adjustment amount corresponding to the temperature difference; If the temperature difference is less than zero, the actual opening degree is decreased according to the opening degree adjustment amount corresponding to the temperature difference. 8 . The start-up control device for an air source heat pump unit according to claim 7 , wherein when the temperature difference is greater than zero, the electric regulating valve opening degree adjustment sub-module is further configured to obtain by executing the following steps: 9 . The opening adjustment amount corresponding to the temperature difference: If the temperature difference is greater than a preset temperature difference threshold, directly use the opening adjustment amount corresponding to the preset temperature difference threshold as the opening adjustment amount corresponding to the temperature difference; If the temperature difference is greater than a plurality of preset different temperature difference thresholds, selecting the opening adjustment amount corresponding to the largest temperature difference threshold as the opening adjustment amount corresponding to the temperature difference; Wherein, the size of the preset temperature difference threshold is positively correlated with the size of the opening adjustment amount; and/or, When the temperature difference is less than zero, the electric regulating valve opening degree adjustment sub-module is further configured to obtain the opening degree adjustment amount corresponding to the temperature difference by performing the following steps: If the temperature difference is less than the first temperature difference threshold and greater than or equal to the second temperature difference threshold, the opening adjustment amount corresponding to the temperature difference is a preset opening adjustment amount; If the temperature difference is smaller than the second temperature difference threshold, the opening degree adjustment amount corresponding to the temperature difference is determined according to the actual opening degree of the electric control valve, so as to reduce the opening degree adjustment amount according to the opening degree adjustment amount. After the actual opening, close the electric regulating valve. 9. A control device comprising a processor and a storage device adapted to store a plurality of program codes, characterized in that the program codes are adapted to be loaded and run by the processor to execute claims 1 to The start-up control method of the air source heat pump unit described in any one of 4. 10. A computer-readable storage medium in which a plurality of program codes are stored, wherein the program codes are adapted to be loaded and run by a processor to perform the air source of any one of claims 1 to 4 Start-up control method of heat pump unit.

Images