Start-up control method and device for constant-temperature heat pump and electronic equipment

Abstract

The application provides a constant-temperature heat pump starting control method and device and electronic equipment. When the water inlet temperature of the constant-temperature heat pump is within a preset temperature range and the compressor needs to be started for heating, the crankshaft heating belt of the compressor is controlled to be preheated. If the preheating duration reaches a preset duration, the compressor is started, and within a first preset time period after the compressor is started, the opening degree of the expansion valve is locked at a first opening degree value, and the compressor is operated at a low frequency. Within a second preset time period after the compressor is started, the expansion valve is linearly and gently opened, the operating frequency of the compressor is gradually increased, and the opening degree of the expansion valve is adaptively adjusted according to the current high-pressure pressure of the compressor. After the compressor is started for more than the second preset time period, PID constant-temperature regulation is switched to be performed on the frequency of the compressor and the opening degree of the expansion valve. In this way, under the high-temperature water inlet heating starting condition, the constant-temperature heat pump can prevent gas separation and full liquid while avoiding excessive throttling and pressure holding, and can also ensure liquid prevention and safe high-pressure operation.

Description

Technical Field

[0001] This invention relates to the field of equipment control technology, and in particular to a start-up control method, device, and electronic equipment for a constant temperature heat pump. Background Technology

[0002] Currently, the industry standard for R290 constant-temperature heat pumps generally adopts a fixed large-opening start-up logic, with the initial opening of the electronic expansion valve typically set to 200~300N, allowing for rapid frequency ramp-up during startup. This control method is suitable for both normal and low-temperature inlet water conditions. However, under the national standard oil return test at 40℃ high-temperature inlet water compressor startup conditions, the unit's inlet water temperature is high, the condensing heat exchange temperature difference is small, and the system high pressure rises rapidly. R290 refrigerant itself has sensitive pressure characteristics and a low saturation pressure. Compared to R32 and R410A refrigerants, its high pressure rises faster at the same water temperature. This can easily lead to issues such as full liquid-gas separation, poor oil return, easy high-pressure protection, and algorithm logic not matching the pressure characteristics of R290 in R290 constant-temperature heat pumps under 40℃ high-temperature inlet water heating startup conditions. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a start-up control method, device and electronic equipment for a constant temperature heat pump, so that the constant temperature heat pump can prevent the liquid from overflowing while avoiding the problem of excessive throttling and pressure build-up under the starting condition of high temperature water intake at 40°C, and take into account the prevention of liquid carryover, oil return optimization and high pressure safe operation.

[0004] In a first aspect, embodiments of the present invention provide a start-up control method for a constant-temperature heat pump. The constant-temperature heat pump includes a compressor and an expansion valve. The expansion valve is used to depressurize and cool high-pressure liquid propane to obtain low-temperature, low-pressure gaseous propane. The compressor is used to draw in the low-temperature, low-pressure gaseous propane and convert the gaseous propane into a high-temperature, high-pressure gas. The method includes: in response to the inlet water temperature of the constant-temperature heat pump being within a preset temperature range and the compressor needing to start heating, controlling the crankshaft heating belt of the compressor to preheat; in response to the preheating time of the crankshaft heating belt of the compressor reaching a preset time, starting the compressor, and within a first preset time period after the compressor starts, controlling the opening degree of the expansion valve to lock at a first opening degree value, and controlling the compressor to operate at a low frequency; within a second preset time period after the compressor starts, controlling the expansion valve to open linearly and smoothly, controlling the compressor to gradually increase its operating frequency, and adaptively adjusting the opening degree of the expansion valve according to the current high pressure of the compressor; after the compressor has been running for more than the second preset time period, switching to PID constant-temperature regulation of the compressor's operating frequency and the opening degree of the expansion valve.

[0005] In an optional embodiment, the above method further includes: disabling PID constant temperature regulation during a first preset time period and a second preset time period after the compressor is turned on.

[0006] In an optional embodiment, the step of adaptively adjusting the opening of the expansion valve according to the current high pressure of the compressor includes: in response to the current high pressure being less than a first preset pressure, reducing the opening of the expansion valve according to the increase in the current high pressure; in response to the current high pressure being greater than or equal to a second preset pressure, locking the opening of the expansion valve, and reducing the operating frequency of the compressor and increasing the fan speed.

[0007] In an optional embodiment, the first preset pressure is less than the second preset pressure; the method further includes: in response to the current high pressure being greater than or equal to the first preset pressure and less than the second preset pressure, reducing the operating frequency of the compressor according to the increase in the current high pressure.

[0008] In an optional embodiment, the above method further includes: real-time acquisition of the suction temperature of the constant temperature heat pump, and determination of whether the suction temperature is greater than a preset temperature threshold; if it is greater, enabling overheat compensation when the compressor starts, so as to maintain the start-up overheat within the preset temperature range.

[0009] In an optional embodiment, the method further includes: in response to the inlet water temperature of the constant temperature heat pump not being within the preset temperature range and the compressor needing to start heating, turning on the compressor, and adjusting the operating frequency of the compressor and the opening degree of the expansion valve through PID constant temperature regulation.

[0010] In an optional embodiment, the above method further includes: real-time detection of the high pressure and ambient temperature of the constant temperature heat pump to obtain detection data; determining whether the constant temperature heat pump is operating abnormally based on the detection data; and triggering an abnormal protection mechanism based on the detection data if the operation is abnormal.

[0011] Secondly, embodiments of the present invention also provide a start-up control device for a constant-temperature heat pump. The constant-temperature heat pump includes a compressor and an expansion valve. The expansion valve is used to depressurize and cool high-pressure liquid propane to obtain low-temperature, low-pressure gaseous propane. The compressor is used to draw in the low-temperature, low-pressure gaseous propane and convert the gaseous propane into a high-temperature, high-pressure gas. The device includes: a preheating module, used to control the crankshaft heating belt of the compressor to preheat in response to the inlet water temperature of the constant-temperature heat pump being within a preset temperature range and the compressor needing to start heating; a first control module, used to start the compressor in response to the preheating time of the crankshaft heating belt of the compressor reaching a preset time, and to control the opening degree of the expansion valve to lock at a first opening degree value within a first preset time period after the compressor starts, and to control the compressor to operate at a low frequency; a second control module, used to control the expansion valve to open linearly and smoothly within a second preset time period after the compressor starts, and to control the compressor to gradually increase its operating frequency, and to adaptively adjust the opening degree of the expansion valve according to the current high pressure of the compressor; and a third control module, used to switch to PID constant-temperature regulation of the compressor's operating frequency and the opening degree of the expansion valve after the compressor has been running for more than the second preset time period.

[0012] Thirdly, embodiments of the present invention also provide an electronic device, which includes a processor and a memory. The memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the above-described constant temperature heat pump start-up control method.

[0013] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are invoked and executed by a processor, the computer-executable instructions cause the processor to implement the above-described constant-temperature heat pump start-up control method.

[0014] The embodiments of the present invention bring the following beneficial effects: This invention provides a start-up control method, device, and electronic equipment for a constant-temperature heat pump. First, in response to the inlet water temperature of the heat pump being within a preset temperature range and the compressor requiring heating start-up, the crankshaft heating belt of the compressor is preheated. Then, in response to the preheating time of the crankshaft heating belt reaching a preset duration, the compressor is started. During a first preset time period after the compressor starts, the opening degree of the expansion valve is locked at a first opening value, and the compressor is controlled to operate at low frequency. During a second preset time period after the compressor starts, the expansion valve is controlled to open linearly and smoothly, and the compressor's operating frequency is gradually increased. The opening degree of the expansion valve is also adaptively adjusted according to the compressor's current high-pressure level. After the compressor has been running for more than the second preset time period, the operation frequency and the opening degree of the expansion valve are switched to PID constant-temperature regulation. In this method, under high-temperature inlet water heating start-up conditions, the constant-temperature heat pump prevents excessive liquid accumulation in the gas separator while avoiding excessive throttling and pressure build-up, thus balancing liquid carryover prevention and high-pressure safe operation.

[0015] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1A flowchart of a start-up control method for a constant-temperature heat pump provided in an embodiment of the present invention; Figure 2 A logic control diagram of a constant temperature heat pump provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a constant temperature heat pump start-up control device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] Currently, the industry standard for R290 constant-temperature heat pumps generally adopts a fixed large-opening start-up logic, with the initial opening of the electronic expansion valve typically set to 200~300N, allowing for rapid frequency ramp-up during startup. This control method is suitable for normal and low-temperature inlet water conditions. However, under the national standard oil return test at a high-temperature inlet water compressor startup condition of 40℃, the unit's inlet water temperature is high, the condensing heat exchange temperature difference is small, and the system high pressure rises rapidly. R290 refrigerant itself has sensitive pressure characteristics and a low saturation pressure; compared to R32 and R410A refrigerants, its high pressure rises faster at the same water temperature. Therefore, R290 constant-temperature heat pumps have the following drawbacks under the 40℃ high-temperature inlet water heating start-up condition: 1. High water temperature and large opening degree easily lead to liquid overflow: Under the condition of 40℃ water inlet, the initial opening degree of 200~300N is too large, the throttling pressure difference is large, the instantaneous flow of refrigerant is excessive, the vaporization of evaporator is insufficient, and a large amount of liquid refrigerant enters the gas separator, causing liquid overflow.

[0022] 2. Low oil return rate: The gas separator is full of liquid, which causes the refrigeration oil to be diluted by the refrigerant, resulting in foaming in the oil immersion mirror and failure to meet the standard in the continuous start-stop oil return test.

[0023] 3. Poor pressure adaptability of R290: The traditional high-pressure compensation logic is that the higher the pressure, the smaller the opening. For R290 refrigerant, a pressure of 2.0MPa is already considered a high-risk pressure. Continuously closing the valve will cause a vicious cycle of pressure buildup and trigger the high-pressure protection shutdown.

[0024] 4. Start-up PID oscillation with liquid: Traditional start-up directly switches to PID (Proportional, Integral, Differential) regulation, resulting in large valve position fluctuations and exacerbating liquid carryover during intake.

[0025] To address the aforementioned issues, this invention provides a start-up control method, apparatus, and electronic device for a constant-temperature heat pump. This technology is applicable to start-up scenarios for constant-temperature heat pumps, particularly R290 constant-temperature heat pumps. Specifically, an R290 constant-temperature heat pump refers to an air-source heat pump system that uses R290 (propane) as the refrigerant and achieves high-precision, stable control of the outlet water or ambient temperature through frequency conversion control technology.

[0026] To facilitate understanding of the embodiments of the present invention, a start-up control method for a constant temperature heat pump disclosed in the embodiments of the present invention will be described in detail first. The constant temperature heat pump includes a compressor and an expansion valve. The expansion valve is used to depressurize and cool high-pressure liquid propane to obtain low-temperature and low-pressure gaseous propane. The compressor is used to draw in low-temperature and low-pressure gaseous propane and convert the gaseous propane into high-temperature and high-pressure gas.

[0027] like Figure 1 As shown, the method includes the following specific steps: In step S102, in response to the fact that the inlet water temperature of the constant temperature heat pump is within the preset temperature range and the compressor needs to start heating, the crankshaft heating belt of the compressor is controlled to preheat.

[0028] In practice, the unit collects the inlet water temperature of the constant temperature heat pump in real time. When the inlet water temperature is within the preset temperature range and the compressor needs to start heating, it determines that it will enter the high temperature anti-overfilling mode. This mode preheats the crankshaft heating belt of the compressor before it starts, thereby reducing the refrigerant oil dissolution rate and preventing oil separation and foaming during startup.

[0029] The preset temperature range can be determined according to research and development needs. For example, the preset temperature range can be 32℃~42℃, or it can be greater than or equal to 40℃, etc.

[0030] In step S104, in response to the preheating time of the compressor crankshaft heating belt reaching the preset time, the compressor is turned on, and within the first preset time period after the compressor is turned on, the opening degree of the expansion valve is locked at the first opening degree value, and the compressor is controlled to run at low frequency.

[0031] In practice, the preset duration can be 3 minutes, 4 minutes, or 5 minutes, etc. The first preset time period can be 0-120 seconds or 0-100 seconds after the compressor is turned on, etc.

[0032] During the first preset time period after the compressor starts, the opening degree of the expansion valve needs to be locked at a first opening value (e.g., 80N or 85N), and the compressor needs to be controlled to operate at a low frequency, for example, locked at a first preset frequency, such as 20Hz or 25Hz. This method is optimized for high-temperature water inlet startup, breaking away from the industry's conventional thinking of large opening degrees of 200~300N, and adopting reverse small opening technology to completely eliminate gas separation and liquid filling.

[0033] Step S106: During the second preset time period after the compressor is turned on, control the expansion valve to open linearly and smoothly, control the compressor to gradually increase its operating frequency, and adaptively adjust the opening degree of the expansion valve according to the current high pressure of the compressor.

[0034] In practice, the second preset time period can be 120-240 seconds or 100-240 seconds after the compressor is turned on. Optionally, the minimum time value of the second preset time period is equal to the maximum time value of the first preset time period.

[0035] During the second preset time period after the compressor starts, the expansion valve needs to be controlled to open linearly and smoothly, and the compressor's operating frequency needs to be controlled to gradually increase, thus smoothly transitioning to the current operating condition. Additionally, after the compressor starts, the condensing high-pressure (equivalent to the aforementioned current high-pressure) needs to be collected in real time, and the opening of the expansion valve needs to be adaptively adjusted based on the condensing high-pressure during the second preset time period after the compressor starts, to prevent pressure buildup and high-pressure protection.

[0036] In an optional embodiment, PID thermostatic regulation is disabled during a first preset time period and a second preset time period after the compressor starts. That is, during the first and second preset time periods after the compressor starts, the compressor frequency and the opening degree of the expansion valve are not subject to PID thermostatic regulation, but are adjusted according to the adjustment rules set during the first and second preset time periods. These adjustment rules are the same as those for adjusting the compressor frequency and the opening degree of the expansion valve corresponding to steps S104 and S106 above.

[0037] Step S108: After the compressor has been running for more than the second preset time period, switch to PID constant temperature regulation to adjust the operating frequency of the compressor and the opening of the expansion valve.

[0038] In practice, after the compressor has been running for more than the second preset time period, it automatically switches to PID constant temperature regulation to adjust the compressor's operating frequency and the opening of the expansion valve, thereby completing the start-up transition of the constant temperature heat pump.

[0039] This disclosure provides a start-up control method for a constant-temperature heat pump. Under high-temperature water inlet heating start-up conditions, the constant-temperature heat pump prevents the gas separator from becoming full of liquid while avoiding excessive throttling and pressure build-up, thus balancing liquid carryover prevention and high-pressure safe operation.

[0040] The following examples illustrate how to adaptively adjust the opening of the expansion valve and the compressor frequency.

[0041] Specifically, the above-mentioned process of adaptively adjusting the opening of the expansion valve according to the current high pressure of the compressor may include: in response to the current high pressure being less than a first preset pressure, reducing the opening of the expansion valve according to the increase in the current high pressure; in response to the current high pressure being greater than or equal to a second preset pressure, locking the opening of the expansion valve, and reducing the operating frequency of the compressor and increasing the fan speed.

[0042] In practice, the first preset pressure can be 1.8 MPa, 1.9 MPa, etc., and the second preset pressure can be 2.0 MPa, 2.1 MPa, etc. Specifically, when reducing the opening of the expansion valve according to the increase in the current high pressure, the greater the increase in the current high pressure, the smaller the reduction in the opening of the expansion valve.

[0043] For example, when the current high pressure is less than the first preset pressure, for every preset increase in the current high pressure, the expansion valve opening is reduced by a second opening value, thus achieving a slight 10% flow restriction to prevent liquid carryover. The preset value can be 0.08 MPa, 0.07 MPa, etc.; the second opening value can be 2N or 3N, etc. When the current high pressure is greater than or equal to the second preset pressure, all valve closing actions cease, the expansion valve opening is locked and no longer throttles, and priority is given to reducing the compressor's operating frequency and increasing the fan speed to relieve pressure, preventing pressure buildup and high-pressure protection.

[0044] Furthermore, the first preset pressure is less than the second preset pressure; based on this, in response to the current high pressure being greater than or equal to the first preset pressure and less than the second preset pressure, the operating frequency of the compressor is reduced according to the increase in the current high pressure.

[0045] In practical implementation, when the current high-pressure is greater than or equal to the first preset pressure and less than the second preset pressure, the compressor's operating frequency is reduced based on the increase in the current high-pressure, thereby reducing system heat generation. Specifically, for every preset value increase in the current high-pressure, the compressor's operating frequency decreases by the first preset value; where the preset value can be 0.05 MPa or 0.06 MPa, etc., and the first preset value can be 5 Hz or 6 Hz, etc.

[0046] In practical applications, the opening degree of the expansion valve and the operating frequency of the compressor can be adaptively adjusted according to the following high-pressure adaptive compensation function:

[0047] in, Indicates the corrected opening degree (N) of the expansion valve; This indicates the real-time high pressure (MPa). This represents the reference pressure, taken as 1.5 MPa.

[0048] Based on the above high-voltage adaptive compensation function, when When <1.8 MPa (equivalent to the first preset pressure mentioned above), For every 0.08 MPa increase, the expansion valve opening is reduced by 2 N to achieve a slight flow restriction of 10% to prevent liquid carryover. When 1.8 MPa ≤ When the pressure is <2.0 MPa (equivalent to the second preset pressure mentioned above), the correction range is maintained. For every 0.05 MPa increase, the press's operating frequency decreases by 5 Hz, reducing system heat generation. When When the pressure is ≥2.0 MPa, all valve closing actions are stopped, and the expansion valve position is locked and no longer throttles; the compressor operating frequency is reduced and the fan speed is increased to release pressure and prevent pressure buildup and high pressure protection.

[0049] This disclosure addresses the unique characteristics of R290, such as low pressure tolerance and a high-pressure critical point at 2.0 MPa, by designing a graded compensation algorithm to correct the logic bug of traditional valve-closing at higher pressures, thus eliminating pressure buildup and high-pressure protection issues. Furthermore, this disclosure achieves low-pressure valve closure to prevent liquid carryover and high-pressure valve locking to prevent pressure buildup, creating a closed-loop control logic with strong engineering applicability.

[0050] In one optional implementation, the suction temperature of the constant temperature heat pump is collected in real time, and it is determined whether the suction temperature is greater than a preset temperature threshold. If it is greater, overheat compensation is enabled when the compressor starts to maintain the start-up overheat within the preset temperature range.

[0051] In practical implementation, the aforementioned preset temperature threshold can be set to 32℃ or 35℃, etc.; the aforementioned preset temperature range can be 12~15℃, or above 10℃, etc. Specifically, the suction temperature can be collected in real time by the wired controller, and it can be determined whether the suction temperature is greater than the preset temperature threshold. When the water temperature is greater than the preset temperature threshold, the compressor starts with superheat compensation to maintain the starting superheat above 10℃. Ideally, the starting superheat should be maintained at 12~15℃, and the hysteresis range is used to determine liquid carryover protection.

[0052] In another optional embodiment, the high pressure of the constant temperature heat pump and the ambient temperature are detected in real time to obtain detection data; the constant temperature heat pump is determined to be malfunctioning based on the detection data; if it is malfunctioning, an abnormal protection mechanism is triggered based on the detection data.

[0053] In practical implementation, the above-mentioned abnormal protection mechanisms include high-pressure protection, high ambient temperature protection, and low ambient temperature protection. For example, a protection shutdown is triggered when the high pressure reaches 2.4 MPa, when the ambient temperature is greater than 43°C, and when the ambient temperature is less than 15°C.

[0054] In another optional embodiment, in response to the inlet water temperature of the constant temperature heat pump not being within the preset temperature range and the compressor needing to start heating, the compressor is turned on, and the operating frequency of the compressor and the opening degree of the expansion valve are adjusted by PID constant temperature regulation.

[0055] like Figure 2 The diagram shown is a logic control diagram of a constant temperature heat pump provided in an embodiment of this disclosure. First, the constant temperature heat pump system is powered on and initialized. Then, the inlet water temperature, high pressure and suction temperature of the constant temperature heat pump are collected in real time. When the inlet water temperature is not between 32°C and 42°C and the compressor is in a hot start, it is determined to enter the normal start mode, that is, the compressor is turned on and the compressor operating frequency and the opening of the expansion valve are adjusted by PID constant temperature regulation. When the inlet water temperature is between 32℃ and 42℃ and the compressor starts warmly, it is determined to enter the high-temperature anti-overfilling mode. At this time, before the compressor starts, the crankshaft heating belt preheats for 3-5 minutes and the fan runs at full speed to reduce the refrigerant oil dissolution rate and prevent oil separation and foaming during startup. During the compressor startup time of 0-120 seconds, the expansion valve opening is locked at 80N, and the compressor operates at a low frequency of 20Hz, with the PID integral term disabled to prevent valve position oscillation. During the compressor startup time of 120-240 seconds, the expansion valve opens linearly and smoothly, the compressor gradually increases its frequency, and the operating conditions are smoothly transitioned. Based on the high pressure, the R290 graded high-pressure adaptive compensation algorithm is used to adjust the compressor's operating frequency and the expansion valve opening. After the compressor startup time reaches 240 seconds, complete PID constant temperature regulation is engaged to complete the startup transition. Then, the high pressure, ambient temperature, and liquid level of the constant temperature heat pump are monitored in real time to obtain detection data. Based on the detection data, it is determined whether the constant temperature heat pump is operating abnormally. If abnormality is detected, the abnormal protection mechanism is triggered based on the detection data.

[0056] This disclosure provides an adaptive control method for preventing gas separation and liquid overflow in the high-temperature water inlet of an R290 constant-temperature heat pump. Combining the low-pressure operating characteristics of R290 refrigerant, this disclosure designs a graded high-pressure reverse compensation algorithm. While preventing gas separation and liquid overflow, it avoids excessive throttling and pressure buildup, balancing liquid carryover prevention, oil return optimization, and high-pressure safe operation, filling a gap in the industry's R290 high-temperature water inlet control.

[0057] Corresponding to the above method embodiments, this disclosure also provides a start-up control device for a constant-temperature heat pump. The constant-temperature heat pump includes a compressor and an expansion valve. The expansion valve is used to depressurize and cool high-pressure liquid propane to obtain low-temperature, low-pressure gaseous propane. The compressor is used to draw in the low-temperature, low-pressure gaseous propane and convert it into a high-temperature, high-pressure gas. Figure 3 As shown, the device includes: The preheating module 30 is used to control the preheating of the compressor crankshaft heating belt in response to the inlet water temperature of the constant temperature heat pump being within the preset temperature range and the compressor needing to start heating.

[0058] The first control module 31 is used to start the compressor in response to the preheating time of the crankshaft heating belt of the compressor reaching a preset time, and to control the opening degree of the expansion valve to be locked at a first opening degree value within a first preset time period after the compressor is started, and to control the compressor to run at low frequency.

[0059] The second control module 32 is used to control the expansion valve to open linearly and smoothly during a second preset time period after the compressor is turned on, and to control the compressor to gradually increase its operating frequency, and to adaptively adjust the opening degree of the expansion valve according to the current high pressure of the compressor.

[0060] The third control module 33 is used to switch to PID constant temperature regulation of the compressor's operating frequency and the opening degree of the expansion valve after the compressor has been running for more than a second preset time period.

[0061] The aforementioned constant temperature heat pump start-up control device, under the high temperature water inlet heating start-up condition, prevents the gas separation from becoming full of liquid while avoiding excessive throttling and pressure build-up, thus taking into account both liquid prevention and high pressure safe operation.

[0062] Furthermore, the above-mentioned device also includes a function shielding module, used to shield the PID constant temperature regulation during a first preset time period and a second preset time period after the compressor is turned on.

[0063] Furthermore, the second control module 32 is used to: in response to the current high pressure being less than the first preset pressure, reduce the opening of the expansion valve according to the increase in the current high pressure; in response to the current high pressure being greater than or equal to the second preset pressure, lock the opening of the expansion valve, and reduce the operating frequency of the compressor and increase the speed of the fan.

[0064] Furthermore, the first preset pressure is less than the second preset pressure; based on this, the device further includes a frequency adjustment module, used to: in response to the current high pressure being greater than or equal to the first preset pressure and less than the second preset pressure, reduce the operating frequency of the compressor according to the increase in the current high pressure.

[0065] Furthermore, the above-mentioned device also includes an overheat compensation module, which is used to: collect the suction temperature of the constant temperature heat pump in real time and determine whether the suction temperature is greater than the preset temperature threshold; if it is greater, overheat compensation is activated when the compressor starts so as to maintain the start-up overheat within the preset temperature range.

[0066] Furthermore, the above-mentioned device also includes an automatic adjustment module, used to: in response to the inlet water temperature of the constant temperature heat pump not being within the preset temperature range and the compressor needing to start heating, turn on the compressor, and adjust the operating frequency of the compressor and the opening degree of the expansion valve through PID constant temperature regulation.

[0067] Furthermore, the above-mentioned device also includes a detection module, used to: detect the high pressure and ambient temperature of the constant temperature heat pump in real time and obtain detection data; determine whether the constant temperature heat pump is operating abnormally based on the detection data; if it is operating abnormally, trigger an abnormal protection mechanism based on the detection data.

[0068] The start-up control device for the constant temperature heat pump provided in this embodiment of the invention has the same implementation principle and technical effect as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the aforementioned method embodiment.

[0069] This disclosure also provides an electronic device, such as... Figure 4 As shown, the electronic device includes a processor and a memory. The memory stores machine-executable instructions that can be executed by the processor. The processor executes the machine-executable instructions to implement the aforementioned start-up control method for the constant-temperature heat pump. This electronic device can be a server or a terminal device.

[0070] Furthermore, Figure 4 The electronic device shown also includes a bus 102 and a communication interface 103, with the processor 100, the communication interface 103 and the memory 101 connected via the bus 102.

[0071] The memory 101 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 103 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 102 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0072] Processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 100 or by instructions in software form. Processor 100 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a readily available storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory 101, and the processor 100 reads the information from memory 101 and, in conjunction with its hardware, completes the steps of the method described in the foregoing embodiments.

[0073] This embodiment also provides a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the above-described constant temperature heat pump start-up control method. For specific implementation details, please refer to the method embodiment, which will not be repeated here.

[0074] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0075] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0076] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0077] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A start-up control method for a constant-temperature heat pump, characterized in that, The constant-temperature heat pump includes a compressor and an expansion valve. The expansion valve is used to depressurize and cool high-pressure liquid propane to obtain low-temperature, low-pressure gaseous propane. The compressor is used to draw in the low-temperature, low-pressure gaseous propane and convert it into a high-temperature, high-pressure gas. The method includes: In response to the constant temperature heat pump's inlet water temperature being within a preset temperature range and the compressor needing to start heating, the crankshaft heating belt of the compressor is controlled to preheat. In response to the preheating time of the crankshaft heating belt of the compressor reaching a preset time, the compressor is turned on, and within a first preset time period after the compressor is turned on, the opening degree of the expansion valve is locked at a first opening degree value, and the compressor is controlled to operate at low frequency. During the second preset time period after the compressor is turned on, the expansion valve is controlled to open linearly and smoothly, the compressor is controlled to gradually increase its operating frequency, and the opening degree of the expansion valve is adaptively adjusted according to the current high pressure of the compressor. After the compressor has been running for more than the second preset time period, the system switches to PID constant temperature regulation to adjust the operating frequency of the compressor and the opening degree of the expansion valve.

2. The method according to claim 1, characterized in that, The method further includes: During the first and second preset time periods after the compressor is turned on, the PID constant temperature regulation is disabled.

3. The method according to claim 1, characterized in that, The step of adaptively adjusting the opening of the expansion valve based on the current high pressure of the compressor includes: In response to the current high pressure being less than a first preset pressure, the opening of the expansion valve is reduced according to the increase in the current high pressure. In response to the current high pressure being greater than or equal to the second preset pressure, the opening degree of the expansion valve is adjusted, and the operating frequency of the compressor is reduced and the fan speed is increased.

4. The method according to claim 3, characterized in that, The first preset pressure is less than the second preset pressure; the method further includes: In response to the current high pressure being greater than or equal to the first preset pressure and less than the second preset pressure, the operating frequency of the compressor is reduced according to the increase in the current high pressure.

5. The method according to claim 1, characterized in that, The method further includes: The suction temperature of the constant temperature heat pump is collected in real time, and it is determined whether the suction temperature is greater than a preset temperature threshold. If the temperature is greater than the set value, overheat compensation is activated when the compressor starts to maintain the start-up overheat within a preset temperature range.

6. The method according to claim 1, characterized in that, The method further includes: In response to the fact that the inlet water temperature of the constant temperature heat pump is not within the preset temperature range and the compressor needs to start heating, the compressor is turned on, and the operating frequency of the compressor and the opening degree of the expansion valve are adjusted by PID constant temperature regulation.

7. The method according to claim 1, characterized in that, The method further includes: The high pressure and ambient temperature of the constant temperature heat pump are monitored in real time to obtain the monitoring data; The detection data is used to determine whether the constant temperature heat pump is malfunctioning. If it is malfunctioning, the abnormal protection mechanism is triggered based on the detection data.

8. A start-up control device for a constant-temperature heat pump, characterized in that, The constant-temperature heat pump includes a compressor and an expansion valve. The expansion valve is used to depressurize and cool high-pressure liquid propane to obtain low-temperature, low-pressure gaseous propane. The compressor is used to draw in the low-temperature, low-pressure gaseous propane and convert it into a high-temperature, high-pressure gas. The device includes: The preheating module is used to control the crankshaft heating belt of the compressor to preheat in response to the inlet water temperature of the constant temperature heat pump being within a preset temperature range and the compressor needing to start heating. The first control module is used to start the compressor in response to the preheating time of the crankshaft heating belt of the compressor reaching a preset time, and to control the opening degree of the expansion valve to be locked at a first opening degree value within a first preset time period after the compressor is started, and to control the compressor to operate at low frequency. The second control module is used to control the expansion valve to open linearly and smoothly during a second preset time period after the compressor is turned on, and to control the compressor to gradually increase its operating frequency, and to adaptively adjust the opening degree of the expansion valve according to the current high pressure of the compressor. The third control module is used to switch to PID constant temperature regulation of the compressor's operating frequency and the opening degree of the expansion valve after the compressor has been running for more than the second preset time period.

9. An electronic device, characterized in that, The electronic device includes a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the start-up control method of the constant temperature heat pump according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the start-up control method of the constant-temperature heat pump according to any one of claims 1-7.

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