Control method and device of water heater, storage medium and water heater

Abstract

The invention discloses a control method and device of a water heater, a storage medium and the water heater. The control method of the water heater comprises the steps that in response to a starting instruction, the outdoor environment temperature and the water temperature of a water tank are obtained; and under the condition that it is determined that the outdoor environment temperature and the water temperature of the water tank meet the preset low-temperature condition, the starting speed of a compressor is reduced, frequency limiting control is conducted on the compressor, and the opening degree of a throttling valve is adjusted according to the outdoor coil pipe temperature so as to increase the evaporation temperature. According to the control method of the water heater, whether protection for preventing the evaporation temperature from being too low is started or not is judged before a compressor is started through the water temperature of a water tank and the outdoor environment temperature, and the situation that the compressor passively enters shutdown protection after being started in a general mode is avoided; the opening degree of the throttle valve and the frequency of the compressor are pertinently controlled according to the temperature of the outdoor coil pipe, so that over-low evaporation temperature protection is prevented from being triggered, and the reliability of the compressor of the water heater at low temperature is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a control method, a device, a storage medium and a water heater for a water heater. Background Art

[0002] When the variable frequency water heater is running at low temperature, if the water temperature in the water tank is also low, the evaporation pressure of the compressor may be lower than the minimum evaporation pressure allowed by the compressor specification when the compressor starts, which will have an adverse effect on reliability. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one purpose of the present invention is to provide a control method, device, storage medium and water heater for a water heater, which can judge whether the compressor enters the protection to prevent the evaporation temperature from being too low before starting by the water temperature of the water tank and the outdoor ambient temperature, so as to avoid the compressor passively entering the shutdown protection after the general startup mode, and in the operation process, the opening of the throttle valve and the frequency of the compressor are controlled in a targeted manner according to the outdoor coil temperature, so as to avoid triggering the protection to prevent the evaporation temperature from being too low, and improve the reliability of the water heater compressor at low temperature.

[0004] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present invention proposes a control method for a water heater, the method comprising: in response to a power-on instruction, obtaining the outdoor ambient temperature and the water temperature of a water tank; when it is determined that the outdoor ambient temperature and the water temperature of the water tank meet a preset low temperature condition, reducing the starting rate of the compressor, performing frequency limiting control on the compressor, and adjusting the opening of the throttle valve according to the outdoor coil temperature to increase the evaporation temperature.

[0005] In addition, the control method of the water heater according to the above embodiment of the present invention may also have the following additional technical features:

[0006] According to one embodiment of the present invention, determining that the outdoor ambient temperature and the water temperature in the water tank meet a preset low temperature condition includes: when the outdoor ambient temperature is lower than a first preset temperature and the water temperature in the water tank is lower than a second preset temperature, determining that the outdoor ambient temperature and the water temperature in the water tank meet a preset low temperature condition.

[0007] According to one embodiment of the present invention, when adjusting the opening of the throttle valve according to the outdoor coil temperature, the method further includes: if the outdoor coil temperature is lower than a first protection temperature threshold, performing frequency reduction control on the compressor until the operating frequency of the compressor is reduced to a preset minimum target frequency.

[0008] According to one embodiment of the present invention, the opening of the throttle valve is adjusted according to the outdoor coil temperature, including: when the outdoor coil temperature is less than the second protection temperature threshold, increasing the opening of the throttle valve, and when the opening of the throttle valve increases to the first preset opening, if the outdoor coil temperature is less than the third protection temperature threshold, continuing to increase the opening of the throttle valve until the opening of the throttle valve increases to the second preset opening, wherein the second protection temperature threshold is greater than the third protection temperature threshold, and the second preset opening is greater than the first preset opening.

[0009] According to one embodiment of the present invention, when the opening of the throttle valve increases to a first preset opening, the method further includes: if the outdoor coil temperature is greater than or equal to the third protection temperature threshold, controlling the compressor to maintain the current operating frequency unchanged, controlling the throttle valve to maintain the current opening unchanged, and controlling the outdoor fan to maintain the current speed unchanged.

[0010] According to one embodiment of the present invention, when the opening of the throttle valve increases to a second preset opening, the method further includes: if the outdoor coil temperature is greater than or equal to a first protection temperature threshold, controlling the compressor to maintain the current operating frequency unchanged, controlling the throttle valve to maintain the current opening unchanged, and controlling the outdoor fan to maintain the current speed unchanged, wherein the first protection temperature threshold is less than the third protection temperature threshold; if the outdoor coil temperature is less than the first protection temperature threshold, performing frequency reduction control on the compressor until the operating frequency of the compressor is reduced to a preset minimum target frequency.

[0011] According to one embodiment of the present invention, the opening of the throttle valve is adjusted according to the outdoor coil temperature, and also includes: when the outdoor coil temperature is greater than or equal to the second protection temperature threshold, controlling the compressor to maintain the current operating frequency unchanged, controlling the throttle valve to maintain the current opening unchanged, and controlling the outdoor fan to maintain the current speed unchanged.

[0012] According to one embodiment of the present invention, during the startup process of the compressor, the method further includes:

[0013] If the outdoor coil temperature is lower than a fourth protection temperature threshold and lasts for a first preset time, the compressor is controlled to stop.

[0014] In the control method of the water heater of the embodiment of the present invention, the compressor responds to the start-up instruction and obtains the outdoor environment temperature and the water temperature of the water tank, and determines whether the preset low temperature condition is met according to the outdoor environment temperature and the water temperature of the water tank. If the preset low temperature condition is met, the evaporation temperature is prevented from being too low. The protection mode is entered. When starting, the compressor start rate is reduced and the compressor is frequency-limited to avoid the compressor passively entering the shutdown protection after the general startup mode. During the operation, the opening of the throttle valve and the frequency of the compressor are targetedly controlled according to the outdoor coil temperature. When the outdoor coil temperature is less than the second protection temperature threshold but greater than or equal to the third protection temperature threshold, the opening of the throttle valve is increased to the first preset opening. When the outdoor coil temperature is less than the third protection temperature threshold but greater than or equal to the first protection temperature threshold, the opening of the throttle valve is increased to the second preset opening. When the outdoor coil temperature is less than the first protection temperature threshold, the compressor is depressurized until the frequency of the compressor is reduced to the preset minimum target frequency. In addition, the shutdown protection is proposed. When the outdoor coil temperature is less than the fourth protection temperature threshold, the compressor is controlled to enter the shutdown, thereby improving the reliability of the water heater compressor at low temperature.

[0015] To achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium on which a control program for a water heater is stored. When the program is executed by a processor, the control method for the water heater is implemented.

[0016] To achieve the above-mentioned purpose, the third aspect of the present invention proposes a control device for a water heater, comprising: an acquisition module, used to obtain the outdoor ambient temperature and the water temperature of the water tank in response to a power-on instruction; a control module, used to reduce the starting rate of the compressor and perform frequency limiting control on the compressor when it is determined that the outdoor ambient temperature and the water temperature of the water tank meet the preset low temperature conditions, and adjust the opening of the throttle valve according to the outdoor coil temperature to increase the evaporation temperature.

[0017] To achieve the above-mentioned object, a fourth aspect of the present invention provides a water heater, comprising: a control device for the water heater as described above.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of a method for controlling a water heater according to an embodiment of the present invention;

[0020] Figure 2 is a flow chart of controlling the throttle valve opening and the compressor frequency according to an embodiment of the present invention;

[0021] Figure 3is a flow chart of a method for controlling a water heater according to another embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a control device for a water heater according to an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of a water heater according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following describes a control method, a device, a storage medium, and a water heater of an embodiment of the present invention with reference to the accompanying drawings.

[0026] Figure 1 It is a flow chart of a control method of a water heater according to an embodiment of the present invention.

[0027] In one embodiment of the present invention, Figure 1 As shown, the control method of the water heater includes:

[0028] S1, in response to a power-on instruction, obtaining the outdoor ambient temperature and the water temperature of the water tank.

[0029] S2, when it is determined that the outdoor ambient temperature and the water temperature in the water tank meet the preset low temperature condition, the startup rate of the compressor is reduced, the compressor is frequency-limited, and the opening of the throttle valve is adjusted according to the outdoor coil temperature to increase the evaporation temperature.

[0030] Specifically, the water heater receives a power-on command, responds to the power-on command, turns on the compressor, obtains the outdoor ambient temperature and the water temperature in the water tank, but if the outdoor ambient temperature and the water temperature in the water tank are too low, the water heater is in a low-temperature operation state. At this time, the evaporation temperature is too low, causing the evaporation pressure of the compressor to be lower than the minimum evaporation pressure allowed by the compressor, affecting the reliability of the compressor. The present invention proposes a control logic, which controls the compressor to enter a protection mode to prevent the evaporation temperature from being too low when the outdoor ambient temperature and the water temperature in the water tank meet the preset low-temperature conditions, so as to prevent the evaporation pressure of the compressor from being too low.

[0031] More specifically, in order to prevent the evaporation temperature from being too low, the present invention reduces the starting rate of the compressor when the compressor is started, performs frequency limiting control on the frequency of the compressor, and detects the outdoor coil temperature after starting, and performs targeted control on the opening of the throttle valve and the frequency of the compressor according to the outdoor coil temperature to increase the evaporation temperature and avoid triggering the low evaporation temperature protection.

[0032] In one embodiment of the present invention, Figure 2 As shown, determining that the outdoor ambient temperature and the water tank water temperature meet the preset low temperature condition includes: when the outdoor ambient temperature is less than a first preset temperature and the water tank water temperature is less than a second preset temperature, determining that the outdoor ambient temperature and the water tank water temperature meet the preset low temperature condition.

[0033] Specifically, Figure 2 As shown, after receiving the start-up instruction, the compressor determines whether the outdoor ambient temperature is less than the first preset temperature. If the outdoor ambient temperature is less than the first preset temperature, it is determined that the outdoor ambient temperature is in a low temperature condition. Then, it is determined whether the water tank temperature is less than the second preset temperature. If the water tank temperature is less than the second preset temperature, it is determined that the water tank temperature is in a low temperature condition. Only when both the outdoor ambient temperature and the water tank temperature are in a low temperature condition, it is determined that the outdoor ambient temperature and the water tank water temperature meet the preset low temperature condition, and the compressor enters the protection mode to prevent the evaporation temperature from being too low. If either the outdoor ambient temperature or the water tank water temperature does not meet the low temperature condition, the compressor operates normally.

[0034] The compressor enters the protection mode to prevent the evaporation temperature from being too low, including reducing the compressor startup rate and limiting the frequency of the compressor. During the startup phase of the compressor, the maximum operating frequency of the compressor can be set, and the compressor startup rate can be adjusted to be lower than the normal startup rate to avoid the evaporation pressure suddenly becoming low due to a rapid increase in frequency, triggering shutdown protection.

[0035] In addition to reducing the startup rate of the compressor, the throttle valve opening and the compressor frequency are controlled in a targeted manner according to the outdoor coil temperature to increase the evaporation temperature and avoid triggering the low evaporation temperature protection.

[0036] The present invention detects the temperature of the outdoor coil in real time and adjusts the opening of the throttle valve according to the temperature of the outdoor coil. The present invention sets multiple thresholds for the temperature of the outdoor coil, and performs different control adjustments when the temperature of the outdoor coil is in different intervals. There are a first protection temperature threshold, a second protection temperature threshold, a third protection temperature threshold and a fourth protection temperature threshold, and these four temperature protection thresholds are divided from high to low into the second protection temperature threshold, the third protection temperature threshold, the first protection temperature threshold and the fourth protection temperature threshold.

[0037] If the temperature of the outdoor coil is greater than the second protection temperature threshold, it indicates that there is no risk of the evaporation temperature being too low, and there is no need to adjust the frequency of the compressor, the opening of the throttle valve, and the speed of the outdoor fan.

[0038] In one embodiment of the present invention, Figure 2 As shown, the opening of the throttle valve is adjusted according to the outdoor coil temperature, including: when the outdoor coil temperature is greater than or equal to the second protection temperature threshold, controlling the compressor to maintain the current operating frequency unchanged, controlling the throttle valve to maintain the current opening unchanged, and controlling the outdoor fan to maintain the current speed unchanged.

[0039] Specifically, if the outdoor coil temperature is greater than or equal to the second protection temperature threshold, there is no risk of the outdoor coil temperature being too low, and there is no need to adjust the frequency of the compressor, the opening of the throttle valve, and the speed of the outdoor fan. The compressor is controlled to maintain the current operating frequency, the throttle valve is controlled to maintain the current opening, and the outdoor fan is controlled to maintain the current speed.

[0040] When the outdoor coil temperature is lower than the second protection temperature threshold, there is a risk that the outdoor coil temperature is too low, and the opening of the throttle valve is adjusted to increase the evaporation temperature to avoid triggering the low evaporation temperature protection.

[0041] In one embodiment of the present invention, Figure 2 As shown, the opening of the throttle valve is adjusted according to the outdoor coil temperature, including: when the outdoor coil temperature is less than the second protection temperature threshold, the opening of the throttle valve is increased, and when the opening of the throttle valve is increased to the first preset opening, if the outdoor coil temperature is less than the third protection temperature threshold, the opening of the throttle valve continues to be increased until the opening of the throttle valve is increased to the second preset opening, wherein the second protection temperature threshold is greater than the third protection temperature threshold, and the second preset opening is greater than the first preset opening.

[0042] Specifically, if the outdoor coil temperature is less than the second protection temperature threshold, the throttle valve opening is increased to the first preset opening, and increasing the throttle valve opening will reduce the system throttling effect and increase the evaporation temperature. After the throttle valve opening is increased to the first preset opening, it is continuously determined whether the outdoor coil temperature continues to decrease. If the outdoor coil temperature continues to decrease and decreases to less than the third protection temperature threshold, the throttle valve opening is continuously increased until the throttle valve opening is increased to the second preset opening.

[0043] The second preset opening of the throttle valve is greater than the first preset opening.

[0044] If the temperature of the outdoor coil does not continue to decrease after the opening of the throttle valve is increased to the first preset opening, and the temperature of the outdoor coil is greater than or equal to the third protection temperature threshold, there is no need to further increase the opening of the throttle valve.

[0045] In one embodiment of the present invention, Figure 2 As shown, when the opening of the throttle valve increases to a first preset opening, it also includes: if the outdoor coil temperature is greater than or equal to a third protection temperature threshold, controlling the compressor to maintain the current operating frequency unchanged, controlling the throttle valve to maintain the current opening unchanged, and controlling the outdoor fan to maintain the current speed unchanged.

[0046] Specifically, if the outdoor coil temperature is lower than the second protection temperature threshold and greater than or equal to the third protection temperature threshold, only increasing the opening of the throttle valve to the first preset opening can prevent the evaporation temperature from being too low. After increasing the opening of the throttle valve to the first preset opening, the throttle valve is controlled to maintain the current opening, the compressor is controlled to maintain the current operating frequency, and the outdoor fan is controlled to maintain the current speed.

[0047] If the outdoor coil temperature continues to decrease after the throttle valve opening is increased to the first preset opening, and decreases to less than the third protection temperature threshold, the throttle valve opening is continued to be increased until the throttle valve opening is increased to the second preset opening. If the outdoor coil temperature is still decreasing after the throttle valve opening is increased to the second preset opening, it is determined whether the outdoor coil temperature is lower than the first protection temperature threshold, and the first protection temperature threshold is lower than the third protection temperature threshold. If the outdoor coil temperature is lower than the first protection temperature threshold, the compressor is frequency-limited.

[0048] In one embodiment of the present invention, Figure 2 As shown, when the opening of the throttle valve increases to a second preset opening, the control method of the water heater further includes: if the outdoor coil temperature is greater than or equal to the first protection temperature threshold, controlling the compressor to maintain the current operating frequency unchanged, controlling the throttle valve to maintain the current opening unchanged, and controlling the outdoor fan to maintain the current speed unchanged, wherein the first protection temperature threshold is less than the third protection temperature threshold. If the outdoor coil temperature is less than the first protection temperature threshold, the compressor is frequency-reduced until the operating frequency of the compressor is reduced to a preset minimum target frequency.

[0049] Specifically, if the outdoor coil temperature no longer decreases after the throttle valve opening increases to the second preset opening, and the outdoor coil temperature is greater than or equal to the first protection temperature threshold, then only increasing the throttle valve opening to the second preset opening can prevent the evaporation temperature from being too low. After the throttle valve opening is increased to the second preset opening, the throttle valve is controlled to maintain the current opening, the compressor is controlled to maintain the current operating frequency, and the outdoor fan is controlled to maintain the current speed.

[0050] More specifically, if the outdoor coil temperature continues to decrease after the throttle valve opening increases to a second preset opening, and the outdoor coil temperature is less than a first protection temperature threshold, the compressor is frequency-reduced until the operating frequency of the compressor decreases to a preset minimum target frequency.

[0051] In one embodiment of the present invention, when adjusting the opening of the throttle valve according to the outdoor coil temperature, the control method of the water heater also includes: if the outdoor coil temperature is lower than the first protection temperature threshold, the compressor is frequency-reduced until the operating frequency of the compressor is reduced to a preset minimum target frequency.

[0052] Specifically, the present invention sets four protection gears for the outdoor coil temperature. When the outdoor coil temperature is in different intervals, the risk of the evaporation temperature being too low is different. There are different targeted adjustment methods. When the outdoor coil temperature is less than the second protection temperature threshold but greater than or equal to the third protection temperature threshold, the opening of the throttle valve is increased to the first preset opening; when the outdoor coil temperature is less than the third protection temperature threshold but greater than or equal to the first protection temperature threshold, the opening of the throttle valve is increased to the second preset opening; when the outdoor coil temperature is less than the first protection temperature threshold, the compressor is controlled to reduce the pressure until the frequency of the compressor is reduced to the preset minimum target frequency. If the outdoor coil temperature is in a certain interval, and after the adjustment method corresponding to the interval is adopted, the outdoor coil temperature no longer decreases, the throttle valve is controlled to maintain the current opening unchanged, the compressor is controlled to maintain the current operating frequency unchanged, and the outdoor fan is controlled to maintain the current speed unchanged.

[0053] It should be noted that when the outdoor coil temperature is less than the first protection temperature threshold, the adjustment method of increasing the opening of the throttle valve can also be used. If the compressor is subjected to pressure reduction control, after the compressor frequency is reduced to the preset minimum target frequency, the outdoor coil temperature still decreases. The present invention designs the lowest protection temperature threshold - the fourth protection temperature threshold, that is, the shutdown protection value. If the outdoor coil temperature is less than the fourth protection temperature threshold, the compressor is controlled to shut down.

[0054] In one embodiment of the present invention, Figure 3 As shown, during the startup process of the compressor, the control method of the water heater also includes:

[0055] If the outdoor coil temperature is lower than a fourth protection temperature threshold and lasts for a first preset time, the compressor is controlled to stop.

[0056] Specifically, the fourth protection temperature threshold is the lowest protection temperature threshold of the outdoor coil temperature. If the outdoor coil temperature still drops after the frequency of the compressor is reduced to the preset minimum target frequency, and drops to less than the fourth protection temperature threshold and lasts for the first preset time, the compressor is controlled to shut down.

[0057] More specifically, the fourth protection temperature threshold is applied to any process in the control method of the water heater. As long as the outdoor coil temperature is less than the fourth protection temperature threshold and lasts for a first preset time, the compressor is controlled to shut down and enter shutdown protection. Figure 3 In the example shown, when the compressor receives a power-on command, in response to the power-on command, it is first necessary to determine whether the outdoor coil temperature is less than the fourth protection temperature threshold and lasts for a first preset time. If the outdoor coil temperature is less than the fourth protection temperature threshold and lasts for the first preset time, the compressor stops running directly. The outdoor coil temperature is greater than or equal to the fourth protection temperature threshold, which is a condition that must be met for the compressor to start.

[0058] In the control method of the water heater of the embodiment of the present invention, the compressor responds to the start-up instruction and obtains the outdoor environment temperature and the water temperature of the water tank, and determines whether the preset low temperature condition is met according to the outdoor environment temperature and the water temperature of the water tank. If the preset low temperature condition is met, the evaporation temperature is prevented from being too low. The protection mode is entered. When starting, the compressor start rate is reduced and the compressor is frequency-limited to avoid the compressor passively entering the shutdown protection after the general startup mode. During the operation, the opening of the throttle valve and the frequency of the compressor are targetedly controlled according to the outdoor coil temperature. When the outdoor coil temperature is less than the second protection temperature threshold but greater than or equal to the third protection temperature threshold, the opening of the throttle valve is increased to the first preset opening. When the outdoor coil temperature is less than the third protection temperature threshold but greater than or equal to the first protection temperature threshold, the opening of the throttle valve is increased to the second preset opening. When the outdoor coil temperature is less than the first protection temperature threshold, the compressor is depressurized until the frequency of the compressor is reduced to the preset minimum target frequency. In addition, the shutdown protection is proposed. When the outdoor coil temperature is less than the fourth protection temperature threshold, the compressor is controlled to enter the shutdown, thereby improving the reliability of the water heater compressor at low temperature.

[0059] The invention also provides a control device for the water heater.

[0060] In one embodiment of the present invention, Figure 4 As shown, the control device 100 of the water heater includes:

[0061] The acquisition module 10 is used to acquire the outdoor environment temperature and the water temperature of the water tank in response to the power-on instruction.

[0062] The control module 20 is used to reduce the startup rate of the compressor and perform frequency limiting control on the compressor when it is determined that the outdoor ambient temperature and the water temperature in the water tank meet the preset low temperature conditions, and adjust the opening of the throttle valve according to the outdoor coil temperature to increase the evaporation temperature.

[0063] The present invention also provides a computer-readable storage medium.

[0064] In one embodiment of the present invention, a control program of the water heater is stored on a computer-readable storage medium, and when the program is executed by a processor, the control method of the water heater is implemented.

[0065] The invention also provides a water heater.

[0066] In one embodiment of the present invention, Figure 5 As shown, the water heater 1000 includes the control device 100 of the water heater mentioned above.

[0067] The control device, storage medium and water heater of the water heater of the embodiment of the present invention, through the control method of the water heater, when the compressor responds to the start-up instruction and obtains the outdoor ambient temperature and the water temperature of the water tank, it is judged whether the preset low temperature condition is met according to the outdoor ambient temperature and the water temperature of the water tank. If the preset low temperature condition is met, it enters the protection mode of preventing the evaporation temperature from being too low. When starting, the compressor starting rate is reduced and the compressor is frequency-limited to avoid the compressor passively entering the shutdown protection after the general starting mode. During the operation, the opening of the throttle valve and the frequency of the compressor are targetedly controlled according to the outdoor coil temperature. When the indoor When the outdoor coil temperature is less than the second protection temperature threshold but greater than or equal to the third protection temperature threshold, the opening of the throttle valve is increased to the first preset opening. When the outdoor coil temperature is less than the third protection temperature threshold but greater than or equal to the first protection temperature threshold, the opening of the throttle valve is increased to the second preset opening. When the outdoor coil temperature is less than the first protection temperature threshold, the compressor is controlled to reduce the pressure until the frequency of the compressor is reduced to the preset minimum target frequency. Shutdown protection is also proposed. When the outdoor coil temperature is less than the fourth protection temperature threshold, the compressor is controlled to shut down, thereby improving the reliability of the water heater compressor at low temperatures.

[0068] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0069] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0073] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific implementation situation.

[0074] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for controlling a water heater, characterized in that: The method comprises: In response to a power-on instruction, obtaining an outdoor ambient temperature and a water tank water temperature; When it is determined that the outdoor ambient temperature and the water temperature in the water tank meet the preset low temperature condition, the startup rate of the compressor is reduced, the compressor is frequency-limited, and the opening of the throttle valve is adjusted according to the outdoor coil temperature to increase the evaporation temperature.

2. The method according to claim 1, characterized in that: Determining that the outdoor ambient temperature and the water temperature of the water tank meet a preset low temperature condition includes: When the outdoor ambient temperature is lower than a first preset temperature and the water temperature in the water tank is lower than a second preset temperature, it is determined that the outdoor ambient temperature and the water temperature in the water tank meet a preset low temperature condition.

3. The method according to claim 1 or 2, characterized in that: In the case where the opening of the throttle valve is adjusted according to the outdoor coil temperature, the method further comprises: If the outdoor coil temperature is lower than the first protection temperature threshold, the compressor is frequency-reduced until the operating frequency of the compressor is reduced to a preset minimum target frequency.

4. The method according to claim 1, characterized in that The throttle valve opening is adjusted according to the outdoor coil temperature, including: When the outdoor coil temperature is lower than the second protection temperature threshold, the opening of the throttle valve is increased, and when the opening of the throttle valve is increased to the first preset opening, if the outdoor coil temperature is lower than the third protection temperature threshold, the opening of the throttle valve is continued to be increased until the opening of the throttle valve is increased to the second preset opening, wherein the second protection temperature threshold is higher than the third protection temperature threshold, and the second preset opening is higher than the first preset opening.

5. The method according to claim 4, characterized in that When the opening of the throttle valve increases to a first preset opening, the method further includes: If the outdoor coil temperature is greater than or equal to the third protection temperature threshold, the compressor is controlled to maintain a current operating frequency, the throttle valve is controlled to maintain a current opening, and the outdoor fan is controlled to maintain a current speed.

6. The method according to claim 4, characterized in that When the opening of the throttle valve increases to a second preset opening, the method further includes: If the outdoor coil temperature is greater than or equal to a first protection temperature threshold, the compressor is controlled to maintain a current operating frequency, the throttle valve is controlled to maintain a current opening, and the outdoor fan is controlled to maintain a current speed, wherein the first protection temperature threshold is less than the third protection temperature threshold; If the outdoor coil temperature is lower than the first protection temperature threshold, the compressor is frequency-reduced until the operating frequency of the compressor is reduced to a preset minimum target frequency.

7. The method according to claim 4, characterized in that The throttle valve opening is adjusted according to the outdoor coil temperature, and also includes: When the outdoor coil temperature is greater than or equal to the second protection temperature threshold, the compressor is controlled to maintain a current operating frequency, the throttle valve is controlled to maintain a current opening, and the outdoor fan is controlled to maintain a current speed.

8. The method according to claim 1 or 2, characterized in that: During the startup of the compressor, the method further includes: If the outdoor coil temperature is lower than a fourth protection temperature threshold and lasts for a first preset time, the compressor is controlled to stop.

9. A computer-readable storage medium, characterized in that: A control program for the water heater is stored thereon, and when the program is executed by the processor, a control method for the water heater according to any one of claims 1 to 8 is implemented.

10. A control device for a water heater, characterized in that: include: An acquisition module, used for acquiring the outdoor ambient temperature and the water temperature of the water tank in response to a power-on instruction; The control module is used to reduce the startup rate of the compressor and perform frequency limiting control on the compressor when it is determined that the outdoor ambient temperature and the water temperature of the water tank meet the preset low temperature condition, and adjust the opening of the throttle valve according to the outdoor coil temperature to increase the evaporation temperature.

11. A water heater, characterized in that: include: The control device of the water heater as claimed in claim 10.

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