Method and device for detecting filth blockage of water side heat exchanger of heat pump unit and heat pump unit

Abstract

The invention relates to the technical field of heat pumps, and provides a filth blockage detection method and device for a water side heat exchanger of a heat pump unit and the heat pump unit. The filth blockage detection method for the water side heat exchanger of the heat pump unit comprises the steps that when the heat pump unit operates, the water flow and the water inlet and outlet temperature difference of the water side heat exchanger are obtained; the refrigerant high pressure of the heat pump unit is obtained; according to the water flow of the water side heat exchanger, the inlet and outlet water temperature difference and the refrigerant high pressure of the heat pump unit, a filth blockage evaluation index is determined; according to the filth blockage evaluation index, whether filth blockage happens to the water side heat exchanger or not is judged; and under the condition of filth blockage of the water side heat exchanger, the heat pump unit is controlled to output prompt information. Filth blockage detection and prompt early warning of the water side heat exchanger can be achieved, a user is reminded to clean the water side heat exchanger in time, and therefore the situation that the heat exchange efficiency of the water side heat exchanger of the unit is reduced or damaged due to filth blockage is avoided to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular, to a method and device for detecting fouling of a water-side heat exchanger of a heat pump unit and a heat pump unit. Background Art

[0002] In related technologies, air-source heat pump units are mainly used for preparing hot water. However, when the heat pump unit operates for a long time, the water quality will deteriorate, which easily leads to fouling problems in the water-side heat exchanger. When the water-side heat exchanger is fouled, it will not only cause the heat exchange effect of the heat exchanger to deteriorate, but may even cause corrosion and damage to the heat exchanger, thus affecting the normal operation of the heat pump unit. Summary of the Invention

[0003] The present invention provides a method and device for detecting fouling of a water-side heat exchanger of a heat pump unit and a heat pump unit, so as to solve the defect that the heat exchange effect of the water-side heat exchanger deteriorates or even is damaged due to fouling in related technologies, and can realize the detection and prompt warning of fouling of the water-side heat exchanger, reminding the user to clean it in time, so as to avoid the reduction of heat exchange efficiency or damage of the water-side heat exchanger of the unit to the greatest extent.

[0004] The present invention provides a method for detecting fouling of a water-side heat exchanger of a heat pump unit, including:

[0005] When the heat pump unit is operating, obtaining the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger;

[0006] Obtaining the refrigerant high-pressure pressure of the heat pump unit;

[0007] Determining a fouling evaluation index according to the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit;

[0008] Determining whether the water-side heat exchanger is fouled according to the fouling evaluation index;

[0009] In the case where the water-side heat exchanger is fouled, controlling the heat pump unit to output a prompt message.

[0010] The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, when the heat pump unit is operating, obtains the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit, and based on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit, obtains a fouling blockage evaluation index, and then determines whether the water-side heat exchanger is fouled according to the fouling blockage evaluation index. If fouling blockage occurs, the heat pump unit is controlled to output a prompt message to remind the user to perform cleaning or other maintenance operations. Therefore, the present invention is an active fault diagnosis method, especially has positive significance for the preventive maintenance of heat exchanger fouling blockage, can discover potential problems before serious fouling blockage occurs, helps to reduce equipment damage and energy waste caused by heat exchanger fouling blockage, thereby improving the overall performance and service life of the unit.

[0011] According to a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of determining a fouling blockage evaluation index based on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit includes:

[0012] Perform weighted processing on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit to determine a fouling blockage evaluation index.

[0013] The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention combines multiple relevant parameters reflecting the fouling blockage state of the water-side heat exchanger through weighted processing to form an overall index that can truly reflect the state of the heat exchanger. Through this overall index, the fouling blockage state of the water-side heat exchanger can be accurately detected, thereby effectively improving the detection accuracy.

[0014] According to a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of performing weighted processing on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit to determine a fouling blockage evaluation index includes:

[0015] Q = A×M×ΔT + B×P;

[0016] ΔT = T2 - T1;

[0017] Wherein, Q is the fouling blockage evaluation index, A is the first weight coefficient, M is the water flow rate of the water-side heat exchanger, T1 is the inlet water temperature, T2 is the outlet water temperature, ΔT is the temperature difference between the inlet and outlet water, B is the second weight coefficient, and P is the refrigerant high-pressure of the heat pump unit.

[0018] The method for detecting fouling blockage of the water-side heat exchanger of the heat pump unit provided by the present invention performs weighted processing on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure pressure of the heat pump unit by using a first weight coefficient reflecting the influence degree of the water flow rate and the temperature difference between the inlet and outlet water on the fouling evaluation and a second weight coefficient reflecting the influence degree of the refrigerant high-pressure pressure on the fouling evaluation, so as to comprehensively determine the fouling evaluation index, which helps to timely and accurately detect and solve the fouling problem of the heat exchanger.

[0019] According to a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of determining whether the water-side heat exchanger is fouled according to the fouling evaluation index includes:

[0020] Determine that the fouling evaluation index is greater than or equal to the target preset value, and determine that the water-side heat exchanger is fouled.

[0021] According to a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of determining whether the water-side heat exchanger is fouled according to the fouling evaluation index further includes:

[0022] Determine that the fouling evaluation index is less than the target preset value, and determine that the water-side heat exchanger is not fouled.

[0023] According to a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of controlling the heat pump unit to output a prompt message in the case of fouling blockage of the water-side heat exchanger includes:

[0024] In the case of fouling blockage of the water-side heat exchanger, determine the fouling degree of the heat pump unit according to the fouling evaluation index;

[0025] Control the heat pump unit to output a corresponding prompt message according to the fouling degree.

[0026] The method for detecting fouling blockage of the water-side heat exchanger of the heat pump unit provided by the present invention can, in the case of fouling blockage of the water-side heat exchanger, judge the fouling degree through the fouling evaluation index. For example, different fouling levels can be divided according to preset thresholds or intervals. For different levels of fouling, the heat pump unit can output different prompt messages to prompt the user in time. The method of hierarchical processing of the present invention can more accurately reflect the fouling situation of the heat exchanger and helps the user to take appropriate maintenance measures.

[0027] According to a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of determining the fouling degree of the heat pump unit according to the fouling evaluation index includes:

[0028] If the fouling evaluation index reaches the first preset index, determine that the fouling degree is the first fouling level;

[0029] If the fouling evaluation index reaches the second preset index, determine that the fouling degree is the second fouling level;

[0030] If the fouling evaluation index reaches the third preset index, determine that the fouling degree is the third fouling level;

[0031] Wherein, the first preset index is greater than or equal to the target preset value and less than the second preset index, and the second preset index is less than the third preset index; the first fouling level is less than the second fouling level, and the second fouling level is less than the third fouling level.

[0032] The method for detecting fouling of the water-side heat exchanger of the heat pump unit provided by the present invention can determine the fouling degree of the heat pump unit according to the fouling evaluation index, which is achieved by setting different preset indexes and corresponding fouling levels. This grading method can more accurately reflect the fouling situation of the heat exchanger, help to distinguish different levels of fouling problems, and can take appropriate countermeasures according to the actual situation.

[0033] According to a method for detecting fouling of the water-side heat exchanger of a heat pump unit provided by the present invention, the step of controlling the heat pump unit to output corresponding prompt information according to the fouling degree includes:

[0034] Determine that the fouling degree is the first fouling level, and control the heat pump unit to continuously output a warning signal for a first preset duration;

[0035] Determine that the fouling degree is the second fouling level, and control the heat pump unit to continuously output a warning signal for a second preset duration and issue a shutdown inquiry command;

[0036] Determine that the fouling degree is the third fouling level, and control the heat pump unit to shut down and continuously output a warning signal for a third preset duration;

[0037] Wherein, the first preset duration is less than the second preset duration, and the second preset duration is less than the third preset duration.

[0038] The method for detecting fouling of the water-side heat exchanger of the heat pump unit provided by the present invention can control the heat pump unit to output corresponding prompt information according to the fouling degree, which is achieved by setting different preset durations and warning signals. As the fouling degree increases, the duration of the warning signal also gradually increases to attract more attention from users, which helps to timely detect and solve the fouling problem of the heat exchanger.

[0039] The present invention also provides a device for detecting fouling of the water-side heat exchanger of a heat pump unit, including:

[0040] A first acquisition module, configured to acquire the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger when the heat pump unit is operating;

[0041] A second acquisition module, configured to acquire the refrigerant high-pressure pressure of the heat pump unit;

[0042] A determination module, configured to determine a fouling evaluation index according to the water flow rate, the inlet and outlet water temperature difference of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit;

[0043] A determination module, configured to determine whether the water-side heat exchanger is fouled according to the fouling evaluation index;

[0044] A control module, configured to control the heat pump unit to output a prompt message when the water-side heat exchanger is fouled.

[0045] The fouling detection device for the water-side heat exchanger of the heat pump unit provided by the present invention can realize the fouling detection and prompt warning of the water-side heat exchanger, remind the user to clean in time, so as to avoid the heat exchange efficiency of the water-side heat exchanger of the unit from being reduced or damaged due to fouling to the greatest extent.

[0046] The present invention also provides a heat pump unit, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the above-mentioned fouling detection method for the water-side heat exchanger of the heat pump unit is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following descriptions are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 is one of the structural schematic diagrams of the heat pump unit provided by the present invention;

[0049] Figure 2 is one of the flow schematic diagrams of the fouling detection method for the water-side heat exchanger of the heat pump unit provided by the present invention;

[0050] Figure 3 is the second flow schematic diagram of the fouling detection method for the water-side heat exchanger of the heat pump unit provided by the present invention;

[0051] Figure 4 is the structural schematic diagram of the fouling detection device for the water-side heat exchanger of the heat pump unit provided by the present invention;

[0052] Figure 5 is the second structural schematic diagram of the heat pump unit provided by the present invention.

[0053] Reference numerals:

[0054] 101: Compressor; 102: Water - side heat exchanger; 103: Evaporator;

[0055] 104: Pressure sensor; 105: Inlet water temperature sensor;

[0056] 106: Outlet water temperature sensor;

[0057] 401: First acquisition module; 402: Second acquisition module; 403: Determination module;

[0058] 404: Judgment module; 405: Control module;

[0059] 501: Processor; 502: Communication interface;

[0060] 503: Memory; 504: Communication bus. Detailed implementation manners

[0061] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0062] In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0063] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0064] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0065] The following combines Figures 1 - 5 to describe the method and device for detecting fouling blockage of the water-side heat exchanger of a heat pump unit and the heat pump unit of the present invention.

[0066] According to an embodiment of the present invention, with reference to Figure 1 as shown, the present invention provides a heat pump unit, which mainly includes: a refrigerant circulation pipeline, a pressure sensor 104, a water inlet temperature sensor 105, a water outlet temperature sensor 106, and a controller, etc.

[0067] Among them, the refrigerant circulation pipeline mainly includes a compressor 101, a water-side heat exchanger 102, and an evaporator 103 that are sequentially connected in a cycle. During the heating operation, the high-temperature and high-pressure gaseous refrigerant generated by the compressor 101 enters the water-side heat exchanger 102 to condense and release heat, heating the incoming water. The condensed liquid refrigerant flows into the evaporator 103 to evaporate and absorb heat to become gaseous refrigerant, and then flows back to the compressor 101 again.

[0068] The pressure sensor 104 is arranged on the exhaust side of the compressor 101 and is used to detect the high-pressure of the discharged refrigerant; the water inlet temperature sensor 105 is arranged at the water inlet of the water-side heat exchanger 102 and is used to detect the water inlet temperature; the water outlet temperature sensor 106 is arranged at the water outlet of the water-side heat exchanger 102 and is used to detect the water outlet temperature; the controller is respectively connected to the compressor 101, the pressure sensor 104, the water inlet temperature sensor 105, and the water outlet temperature sensor 106, and is used to execute the method for detecting fouling blockage of the water-side heat exchanger of the heat pump unit. For details, see the following, and no further elaboration will be made here.

[0069] According to an embodiment of the present invention, with reference to Figure 2 as shown, the present invention provides a method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit, which mainly includes the following steps:

[0070] S201. When the heat pump unit is operating, obtain the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger;

[0071] S202. Obtain the high-pressure of the refrigerant of the heat pump unit;

[0072] S203. Determine a fouling evaluation index based on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit;

[0073] S204. Determine whether the water-side heat exchanger is fouled according to the fouling evaluation index;

[0074] S205. When the water-side heat exchanger is fouled, control the heat pump unit to output a prompt message.

[0075] Specifically, when the heat pump unit is running, the water flow rate of the water-side heat exchanger and the temperature difference between the inlet and outlet water are obtained in real time. These two parameters can reflect the working efficiency of the heat exchanger and potential problems. If the water flow rate decreases or the temperature difference between the inlet and outlet water increases, it may mean that there is a blockage inside the heat exchanger; and the refrigerant high-pressure of the heat pump unit is obtained in real time. The change in the refrigerant high-pressure can also reflect the state of the heat exchanger. When the heat exchanger is blocked, it may cause the refrigerant pressure to rise; according to the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit, a fouling evaluation index for comprehensively evaluating the fouling state of the heat exchanger is obtained. Then, according to the fouling evaluation index, it is determined whether the water-side heat exchanger is fouled. Once it is determined that the heat exchanger is fouled, the heat pump unit is controlled to output a prompt message to remind the user to perform cleaning or other maintenance operations.

[0076] Therefore, the method provided by the embodiment of the present invention is an active fault diagnosis method, which has positive significance for the preventive maintenance of heat exchanger fouling in particular. It can detect potential problems before serious fouling occurs, which helps to reduce equipment damage and energy waste caused by heat exchanger fouling, thereby improving the overall performance and service life of the unit.

[0077] According to an embodiment of the present invention, the step of determining a fouling evaluation index based on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit includes:

[0078] Perform a weighting process on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure of the heat pump unit to determine the fouling evaluation index.

[0079] The method for detecting fouling of the water-side heat exchanger of the heat pump unit provided by the embodiment of the present invention combines multiple relevant parameters reflecting the fouling state of the water-side heat exchanger through a weighting process to form an overall index that can truly reflect the state of the heat exchanger. Through this overall index, the fouling state of the water-side heat exchanger can be accurately detected, thereby effectively improving the detection accuracy.

[0080] According to an embodiment of the present invention, the steps of determining a fouling evaluation index by performing weighted processing on the water flow rate of the water-side heat exchanger, the temperature difference between the inlet and outlet water, and the refrigerant high-pressure pressure of the heat pump unit include:

[0081] Q = A × M × ΔT + B × P;

[0082] ΔT = T2 - T1;

[0083] Wherein, Q is the fouling evaluation index, A is the first weight coefficient, M is the water flow rate of the water-side heat exchanger, T1 is the inlet water temperature, T2 is the outlet water temperature, ΔT is the temperature difference between the inlet and outlet water, B is the second weight coefficient, and P is the refrigerant high-pressure pressure of the heat pump unit.

[0084] Specifically, the first weight coefficient reflects the influence degree of the water flow rate and the temperature difference between the inlet and outlet water on the fouling evaluation, the second weight coefficient reflects the influence degree of the refrigerant high-pressure pressure on the fouling evaluation, and the numerical values of the first weight coefficient and the second weight coefficient can be confirmed through unit experiments under standard operating conditions. This coefficient is related to the operation of unit parameters and is obtained through the accumulation of test data for each model unit, and can be specifically adjusted according to actual application situations.

[0085] The embodiment of the present invention combines multiple parameters related to heat exchanger fouling through a weighted processing method to form an overall index that can truly and accurately reflect the fouling state of the heat exchanger, which helps to timely and accurately discover and solve the fouling problem of the heat exchanger.

[0086] According to an embodiment of the present invention, the steps of determining whether the water-side heat exchanger is fouled according to the fouling evaluation index include:

[0087] Determine that the water-side heat exchanger is fouled when it is determined that the fouling evaluation index is greater than or equal to the target preset value;

[0088] Determine that the water-side heat exchanger is not fouled when it is determined that the fouling evaluation index is less than the target preset value.

[0089] Specifically, compare the obtained fouling evaluation index with the set target preset value. When the fouling evaluation index is greater than or equal to the target preset value, it can be considered that fouling has occurred; otherwise, fouling has not occurred.

[0090] According to an embodiment of the present invention, referring to Figure 3 As shown, in the case where the water-side heat exchanger is fouled, the steps of controlling the heat pump unit to output a prompt message include:

[0091] S301. In the case where the water-side heat exchanger is fouled, determine the fouling degree of the heat pump unit according to the fouling evaluation index;

[0092] S302. Control the heat pump unit to output a corresponding prompt message according to the fouling degree.

[0093] The method for detecting fouling of the water - side heat exchanger of the heat pump unit provided by the embodiment of the present invention can, in the case of fouling of the water - side heat exchanger, judge the degree of fouling through a fouling evaluation index. For example, different fouling levels can be divided according to a preset threshold or range. For different levels of fouling, the heat pump unit can output different prompt messages to prompt the user in a timely manner. The method of hierarchical processing in the present invention can more accurately reflect the fouling situation of the heat exchanger, which helps the user to take appropriate maintenance measures.

[0094] According to an embodiment of the present invention, the step of determining the fouling degree of the heat pump unit according to the fouling evaluation index includes:

[0095] If the fouling evaluation index reaches the first preset index, it is determined that the fouling degree is the first fouling level;

[0096] If the fouling evaluation index reaches the second preset index, it is determined that the fouling degree is the second fouling level;

[0097] If the fouling evaluation index reaches the third preset index, it is determined that the fouling degree is the third fouling level;

[0098] Wherein, the first preset index is greater than or equal to the target preset value and less than the second preset index, and the second preset index is less than the third preset index; the first fouling level is less than the second fouling level, and the second fouling level is less than the third fouling level, which reflects the severity of the fouling level.

[0099] Specifically, as the fouling evaluation index increases, the fouling degree also gradually increases. When the fouling evaluation index reaches the first preset index, it can be considered that the heat exchanger is in a mild fouling state; when the fouling evaluation index reaches the second preset index, it can be considered that the heat exchanger is in a moderate fouling state; when the fouling evaluation index reaches the third preset index, it can be considered that the heat exchanger is in a severe fouling state.

[0100] The method for detecting fouling of the water - side heat exchanger of the heat pump unit provided by the embodiment of the present invention can determine the fouling degree of the heat pump unit according to the fouling evaluation index, which is achieved by setting different preset indexes and corresponding fouling levels. This hierarchical method can more accurately reflect the fouling situation of the heat exchanger, helps to distinguish different levels of fouling problems, and can take appropriate countermeasures according to the actual situation.

[0101] According to an embodiment of the present invention, the step of controlling the heat pump unit to output corresponding prompt messages according to the fouling degree includes:

[0102] Determine that the fouling degree is the first fouling level, and control the heat pump unit to continuously output a warning signal for the first preset duration;

[0103] Determine that the degree of dirt blockage is the second dirt blockage level, control the heat pump unit to continuously output a warning signal for a second preset duration and issue a shutdown inquiry command;

[0104] Determine that the degree of dirt blockage is the third dirt blockage level, control the heat pump unit to shut down and continuously output a warning signal for a third preset duration;

[0105] Among them, the first preset duration is less than the second preset duration, and the second preset duration is less than the third preset duration. That is, as the degree of dirt blockage increases, the duration of the warning signal also gradually increases to attract more attention from users.

[0106] Specifically, when the degree of dirt blockage is at the first dirt blockage level, it indicates mild dirt blockage. At this time, the heat pump unit continuously outputs a warning signal for a short time to remind the user to pay attention and clean regularly; when the degree of dirt blockage reaches the second dirt blockage level, it indicates moderate dirt blockage. At this time, in addition to continuously outputting a warning signal for a relatively long time, the heat pump unit also issues a shutdown inquiry command, and the user can choose to continue running or shut down for cleaning; when the degree of dirt blockage reaches the most serious third dirt blockage level, it indicates severe dirt blockage. At this time, the heat pump unit will automatically force a shutdown and continuously output a warning signal for a long time to remind the user that immediate cleaning or repair is required until the user cleans the water-side heat exchanger and resumes and then re-detects.

[0107] The method for detecting dirt blockage of the water-side heat exchanger of the heat pump unit provided by the embodiment of the present invention can control the heat pump unit to output corresponding prompt information according to the degree of dirt blockage, which is achieved by setting different preset durations and warning signals. This method can more accurately reflect the dirt blockage situation of the heat exchanger and help users take appropriate maintenance measures.

[0108] The dirt blockage detection device of the water-side heat exchanger of the heat pump unit provided by the present invention will be described below. The dirt blockage detection device of the water-side heat exchanger of the heat pump unit described below can be mutually corresponding and referred to the dirt blockage detection method of the water-side heat exchanger of the heat pump unit described above.

[0109] According to an embodiment of the present invention, refer to Figure 4As shown in the figure, the present invention also provides a device for detecting fouling and blockage of the water-side heat exchanger of a heat pump unit, which mainly includes: a first acquisition module 401, a second acquisition module 402, a determination module 403, a judgment module 404, and a control module 405. Among them, the first acquisition module 401 is used to acquire the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger when the heat pump unit is operating; the second acquisition module 402 is used to acquire the refrigerant high-pressure pressure of the heat pump unit; the determination module 403 is used to determine a fouling evaluation index according to the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit; the judgment module 404 is used to judge whether the water-side heat exchanger is fouled and blocked according to the fouling evaluation index; the control module 405 is used to control the heat pump unit to output a prompt message when the water-side heat exchanger is fouled and blocked.

[0110] The device for detecting fouling and blockage of the water-side heat exchanger of the heat pump unit provided by the embodiment of the present invention can realize the detection of fouling and blockage of the water-side heat exchanger and prompt warning, reminding the user to clean it in time, so as to avoid the reduction of heat exchange efficiency or damage of the water-side heat exchanger of the unit to the greatest extent.

[0111] According to an embodiment of the present invention, refer to Figure 5 As shown in the figure, the present invention also provides a heat pump unit, which may include: a processor 501, a communication interface 502, a memory 503, and a communication bus 504. Among them, the processor 501, the communication interface 502, and the memory 503 complete mutual communication through the communication bus 504. The processor 501 can call the logical instructions in the memory 503 to execute the method for detecting fouling and blockage of the water-side heat exchanger of the heat pump unit, and the method includes: when the heat pump unit is operating, acquiring the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger; acquiring the refrigerant high-pressure pressure of the heat pump unit; determining a fouling evaluation index according to the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit; judging whether the water-side heat exchanger is fouled and blocked according to the fouling evaluation index; and controlling the heat pump unit to output a prompt message when the water-side heat exchanger is fouled and blocked.

[0112] In addition, when the logical instructions in the above-mentioned memory 503 can be implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0113] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the heat pump unit water-side heat exchanger fouling detection method provided by the above-mentioned various methods. The method includes: when the heat pump unit is operating, obtaining the water flow rate and the inlet and outlet water temperature difference of the water-side heat exchanger; obtaining the refrigerant high-pressure pressure of the heat pump unit; determining a fouling evaluation index based on the water flow rate, the inlet and outlet water temperature difference of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit; determining whether the water-side heat exchanger is fouled according to the fouling evaluation index; and controlling the heat pump unit to output a prompt message in the case where the water-side heat exchanger is fouled.

[0114] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the heat pump unit water-side heat exchanger fouling detection method provided by the above-mentioned various methods. The method includes: when the heat pump unit is operating, obtaining the water flow rate and the inlet and outlet water temperature difference of the water-side heat exchanger; obtaining the refrigerant high-pressure pressure of the heat pump unit; determining a fouling evaluation index based on the water flow rate, the inlet and outlet water temperature difference of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit; determining whether the water-side heat exchanger is fouled according to the fouling evaluation index; and controlling the heat pump unit to output a prompt message in the case where the water-side heat exchanger is fouled.

[0115] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0116] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. These modifications or replacements 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.

Claims

1. A method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit, characterized in that, Including: When the heat pump unit is operating, obtain the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger; Obtain the refrigerant high-pressure pressure of the heat pump unit; Determine the fouling evaluation index according to the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit; Judge whether the water-side heat exchanger is fouled according to the fouling evaluation index; In the case where the water-side heat exchanger is fouled, control the heat pump unit to output a prompt message.

2. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to claim 1, characterized in that, The step of determining the fouling evaluation index according to the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit includes: Perform weighted processing on the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit to determine the fouling evaluation index.

3. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to claim 2, characterized in that, The step of performing weighted processing on the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit to determine the fouling evaluation index includes: Q = A×M×ΔT + B×P; ΔT = T2 - T1; Wherein, Q is the fouling evaluation index, A is the first weight coefficient, M is the water flow rate of the water-side heat exchanger, T1 is the inlet water temperature, T2 is the outlet water temperature, ΔT is the temperature difference between the inlet and outlet water, B is the second weight coefficient, and P is the refrigerant high-pressure pressure of the heat pump unit.

4. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to claim 1, characterized in that, The step of judging whether the water-side heat exchanger is fouled according to the fouling evaluation index includes: Determine that the fouling evaluation index is greater than or equal to the target preset value, and judge that the water-side heat exchanger is fouled.

5. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to claim 4, characterized in that, The step of judging whether the water-side heat exchanger is fouled according to the fouling evaluation index further includes: Determine that the fouling evaluation index is less than the target preset value, and judge that the water-side heat exchanger is not fouled.

6. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to any one of claims 1-5, characterized in that, The step of controlling the heat pump unit to output a corresponding prompt message in the case where the water-side heat exchanger is fouled includes: In the case where the water-side heat exchanger is fouled, determine the fouling degree of the heat pump unit according to the fouling evaluation index; Control the heat pump unit to output a corresponding prompt message according to the fouling degree.

7. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to claim 6, characterized in that, The step of determining the fouling degree of the heat pump unit according to the fouling evaluation index includes: If the fouling evaluation index reaches the first preset index, determine that the fouling degree is the first fouling level; If the fouling evaluation index reaches the second preset index, determine that the fouling degree is the second fouling level; If the fouling evaluation index reaches the third preset index, determine that the fouling degree is the third fouling level; Wherein, the first preset index is greater than or equal to the target preset value and less than the second preset index, and the second preset index is less than the third preset index; the first fouling level is less than the second fouling level, and the second fouling level is less than the third fouling level.

8. The method for detecting fouling blockage of the water-side heat exchanger of a heat pump unit according to claim 7, characterized in that, The step of controlling the heat pump unit to output a corresponding prompt message according to the fouling degree includes: Determine that the fouling degree is the first fouling level, and control the heat pump unit to continuously output a warning signal for the first preset duration; Determine that the degree of fouling and blockage is the second level of fouling and blockage, control the heat pump unit to continuously output a warning signal for a second preset duration and issue a shutdown inquiry command; Determine that the degree of fouling and blockage is the third level of fouling and blockage, control the heat pump unit to shut down and continuously output a warning signal for a third preset duration; Wherein, the first preset duration is less than the second preset duration, and the second preset duration is less than the third preset duration.

9. A water-side heat exchanger fouling detection device for a heat pump unit, characterized in that, It includes: A first acquisition module, configured to acquire the water flow rate and the temperature difference between the inlet and outlet water of the water-side heat exchanger when the heat pump unit is operating; A second acquisition module, configured to acquire the refrigerant high-pressure pressure of the heat pump unit; A determination module, configured to determine a fouling evaluation index according to the water flow rate, the temperature difference between the inlet and outlet water of the water-side heat exchanger, and the refrigerant high-pressure pressure of the heat pump unit; A judgment module, configured to judge whether the water-side heat exchanger is fouled and blocked according to the fouling evaluation index; A control module, configured to control the heat pump unit to output a prompt message in the case where the water-side heat exchanger is fouled and blocked.

10. A heat pump unit, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for detecting fouling and blockage of the water-side heat exchanger of the heat pump unit according to any one of claims 1-8.

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