Heat recovery air-cooled heat pump cold and hot water machine and oil return control method thereof

[0031] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0032] The following describes the oil return control method of the heat recovery air-cooled heat pump cold and hot water machine and the heat recovery air-cooled heat pump cold and hot water machine according to the embodiments of the present invention with reference to the accompanying drawings.

[0033] figure 1 It is a schematic diagram of a host system of a heat recovery air-cooled heat pump cold and hot water machine according to an embodiment of the present invention. Such as figure 1 As shown, the heat recovery air-cooled heat pump cold and hot water machine includes a hot water side heat exchanger 10, an air side water heater 20, an air-conditioning side water heater 30, and a compressor 1.

[0034] Such as figure 2 As shown, the oil return control method of the heat recovery air-cooled heat pump cold and hot water machine in the embodiment of the present invention includes the following steps:

[0035] S1: Determine whether the heat recovery air-cooled heat pump chiller and hot water machine meets the oil return condition.

[0036] According to an embodiment of the present invention, when the heat recovery air-cooled heat pump cold and hot water machine meets any of the following conditions, it is determined that the heat recovery air-cooled heat pump cold or hot water machine meets the oil return condition:

[0037] (1) The heat recovery air-cooled heat pump cold and hot water machine is powered on for the first time and the heat recovery air-cooled heat pump cold and hot water machine has been running for the first preset time, such as t1 hour;

[0038] (2) The compressor runs continuously for a second preset time, such as t2 hours, where the time is cleared when the compressor is stopped;

[0039] (3) The heat recovery air-cooled heat pump chiller and hot water machine has accumulated a third preset time of operation, such as t3 hours;

[0040] (4) The cumulative number of compressor openings reaches a preset number of times, such as N times.

[0041] S2: If it is determined that the heat recovery air-cooled heat pump cold and hot water machine meets the oil return condition, obtain the current operating mode of the heat recovery air-cooled heat pump cold and hot water machine.

[0042] Among them, the operation modes of the heat recovery air-cooled heat pump cold and hot water machine include heating mode, cooling mode, heating hot water mode and cooling heat recovery mode.

[0043] S3, according to the current operating mode of the heat recovery air-cooled heat pump cold and hot water machine, control the heat recovery air-cooled heat pump cold and hot water machine to perform an oil return action.

[0044] According to an embodiment of the present invention, step S3 specifically includes: when the current operation mode of the heat recovery air-cooled heat pump cold and hot water machine is the cooling mode, controlling the heat recovery air-cooled heat pump cold and hot water machine to switch to the hot water mode operation. Four preset time for oil return; when the current operating mode of the heat recovery air-cooled heat pump chiller or hot water machine is heating mode, control the heat recovery air-cooled heat pump chiller or hot water machine to switch to the hot water mode to run the fourth preset Time to return the oil; when the current operating mode of the heat recovery air-cooled heat pump chiller or hot water machine is the hot water mode, control the heat recovery air-cooled heat pump chiller and water machine to switch to the heating mode to run for the fourth preset time Oil return; when the current operating mode of the heat recovery air-cooled heat pump chiller and hot water machine is the cooling and heat recovery mode, control the heat recovery air-cooled heat pump chiller and water machine to switch to the cooling mode to run for the fourth preset time for oil return. Among them, the fourth preset time may be T minutes, which may be calibrated according to actual conditions.

[0045] It should be noted that when the heat recovery air-cooled heat pump chiller and hot water machine is controlled to switch to the corresponding operation mode for oil return, the fan in the heat recovery air-cooled heat pump chiller and water machine adjusts the speed according to the current working conditions and system pressure.

[0046] Specifically, according to an embodiment of the present invention, such as image 3 As shown, the oil return determination process of the heat recovery air-cooled heat pump cold and hot water machine includes the following steps:

[0047] S301, power on.

[0048] S302, the compressor is started.

[0049] S303: Enter the oil return determination process.

[0050] S304: Determine whether the heat recovery air-cooled heat pump cold and hot water generator is powered on for the first time. If yes, execute step S305; if no, execute step S307 or step S309 or step S311.

[0051] S305: Record the cumulative power-on time of the heat recovery air-cooled heat pump cold and hot water machine.

[0052] S306: Determine whether the accumulated power-on time is greater than or equal to a first preset time, such as t1 hour. If yes, go to step S313; if no, go back to step S305.

[0053] S307: Record the continuous operating time of the compressor.

[0054] S308: Determine whether the continuous operating time of the compressor is greater than or equal to a second preset time, such as t2 hours. If yes, go to step S313; if no, go back to step S307.

[0055] S309: Record the accumulated operating time of the heat recovery air-cooled heat pump cold and hot water machine.

[0056] S310: Determine whether the accumulated operating time of the heat recovery air-cooled heat pump cold and hot water machine is greater than or equal to a third preset time, such as t3 hours. If yes, go to step S313; if no, go back to step S309.

[0057] S311: Record the number of compressor starts.

[0058] S312: It is judged whether the cumulative number of compressor opening times is greater than or equal to N times. If yes, go to step S313; if no, go back to step S311.

[0059] S313: Enter the oil return flow.

[0060] S314: Judge whether the heat recovery air-cooled heat pump cold and hot water machine has completed oil return. If yes, go to step S315; if no, go back to step S313.

[0061] S315: Control the heat recovery air-cooled heat pump cold and hot water machine to exit the oil return action, and reset the oil return determination, for example, all the timers, and then return to step S303.

[0062] Such as Figure 4 As shown, the oil return action process of the heat recovery air-cooled heat pump cold and hot water machine includes the following steps:

[0063] S401, start the oil return action.

[0064] S402: Determine whether the current operation mode of the heat recovery air-cooled heat pump cold and hot water machine is a cooling mode. If yes, execute step S403; if no, execute step S406.

[0065] S403: Control the heat recovery air-cooled heat pump cold and hot water machine to start the hot water production mode to return oil.

[0066] S404: Detect whether the corresponding water pump is turned on in the hot water heating mode. If yes, perform step S417; if not, perform step S405.

[0067] S405: Control the heat recovery air-cooled heat pump chiller and hot water machine to stop returning oil, and display corresponding fault information.

[0068] In other words, before controlling the heat recovery air-cooled heat pump chiller and hot water machine to turn on the hot water mode for oil return, it is necessary to check whether the water flow in the hot water side heat exchanger in the hot water mode is normal.

[0069] S406: Determine whether the current operating mode of the heat recovery air-cooled heat pump cold and hot water machine is a heating mode. If yes, execute step S407; if no, execute step S410.

[0070] S407: Control the heat recovery air-cooled heat pump cold and hot water machine to start the hot water production mode to return oil.

[0071] S408: Detect whether the corresponding water pump is turned on in the hot water heating mode. If yes, execute step S417; if not, execute step S409.

[0072] S409: Control the heat recovery air-cooled heat pump chiller and hot water machine to stop returning oil, and display corresponding fault information.

[0073] That is to say, before controlling the heat recovery air-cooled heat pump cold and hot water machine to turn on the hot water mode for oil return, it is necessary to check whether the water flow in the hot water side heat exchanger in the hot water mode is normal.

[0074] S410: Determine whether the current operation mode of the heat recovery air-cooled heat pump cold and hot water machine is a hot water production mode. If yes, go to step S411; if no, go to step S414.

[0075] S411: Control the heat recovery air-cooled heat pump cold and hot water machine to turn on the heating mode to return oil.

[0076] S412: Detect whether the corresponding water pump is turned on in the heating mode. If yes, perform step S417; if not, perform step S413.

[0077] S413: Control the heat recovery air-cooled heat pump chiller and hot water machine to stop returning oil, and display corresponding fault information.

[0078] In other words, before controlling the heat recovery air-cooled heat pump cold and hot water machine to start the heating mode for oil return, it is necessary to check whether the water flow in the air-conditioning side heat exchanger in the heating mode is normal.

[0079] S414: Control the heat recovery air-cooled heat pump cold and hot water machine to turn on the cooling mode to return oil.

[0080] S415: Detect whether the corresponding water pump is turned on in the cooling mode. If yes, go to step S417; if not, go to step S416.

[0081] S416: Control the heat recovery air-cooled heat pump chiller and hot water machine to stop returning oil, and display the corresponding fault information.

[0082] In other words, before controlling the heat recovery air-cooled heat pump cold and hot water machine to turn on the cooling mode for oil return, it is necessary to check whether the water flow in the air-conditioning side heat exchanger in the cooling mode is normal.

[0083] Therefore, in an embodiment of the present invention, before the heat recovery air-cooled heat pump chiller or hot water machine switches to the corresponding operation mode for oil return, the corresponding water pump in the corresponding operation mode is also controlled to be in the on state.

[0084] S417, record the oil return time.

[0085] S418: Determine whether the oil return time is greater than or equal to a fourth preset time, such as T minutes. If yes, go to step S419; if no, go back to step S417.

[0086] S419: Control the heat recovery air-cooled heat pump cold and hot water machine to exit the oil return action, and reset the oil return determination, for example, reset all timings.

[0087] Among them, t1, t2, t3 and T can be calibrated according to actual conditions.

[0088] According to an embodiment of the present invention, when the heat recovery air-cooled heat pump cold and hot water machine is switched to the corresponding operation mode for oil return, if the high pressure side pressure of the heat recovery air-cooled heat pump cold and hot water machine is greater than or equal to the preset pressure, for example Px, control the heat recovery air-cooled heat pump chiller and hot water machine to exit the oil return action.

[0089] According to the oil return control method of the heat recovery air-cooled heat pump cold and hot water machine according to the embodiment of the present invention, the heat recovery air-cooled heat pump cold and hot water machine is controlled to perform the return by judging whether the heat recovery air-cooled heat pump cold and hot water machine meets the oil return condition. Oil action, specifically, after judging that the heat recovery air-cooled heat pump chiller and hot water machine meets the oil return condition, according to the current operating mode of the heat recovery air-cooled heat pump chiller and water machine, the heat recovery air-cooled heat pump chiller and hot water machine is controlled to perform the oil return action. This can accurately and efficiently control the refrigerating oil in the unit, avoid deposits, ensure that the compressor is always in a safe lubrication state, and ensure that the unit runs safely and reliably.

[0090] Such as figure 1 As shown, the heat recovery air-cooled heat pump cold and hot water machine of an embodiment of the present invention includes: a compressor 1, a gas-liquid separator 2, a first four-way valve 3, a second four-way valve 4, and a hot water side heat exchanger 10. Air-side water heater 20, air-conditioning side water heater 30, first throttling component such as electronic expansion valve EXV1, second throttling component such as electronic expansion valve EXV2, third throttling component such as electronic expansion valve EXV3, valve assembly 40 and control Module 50.

[0091] Wherein, the first port of the gas-liquid separator 2 is connected to the first port of the compressor 1, the port D of the first four-way valve 3 is connected to the second port of the compressor 1, and the E of the first four-way valve 3 The port is connected with the second port of the gas-liquid separator 2; the D port of the second four-way valve 4 is connected with the C port of the first four-way valve 3, and the E port of the second four-way valve 4 is connected with the gas-liquid separator 2 is connected to the second port; the first port of the hot water side heat exchanger 10 is connected to the port C of the second four-way valve 4, and the first port of the air side heat exchanger 20 is connected to the second four-way valve 4 The S port is connected, and the first port of the air-conditioning side heat exchanger 30 is connected to the S port of the first four-way valve 3; the first throttling component such as the first port of the electronic expansion valve EXV1 is connected to the air side heat exchanger 20 The second port communicates with the second port of the first throttle component, such as the electronic expansion valve EXV1, communicates with the first port of the second throttle component, such as the electronic expansion valve EXV2, and is connected to the air-conditioning side heat exchanger 30 through the valve assembly 40 The second port of the second throttling component, such as the electronic expansion valve EXV2, communicates with the first port of the third throttling component, such as the electronic expansion valve EXV3, and exchanges heat with the air conditioner through the one-way valve V2 The second port of the heat exchanger 30 is in communication, and the second port of the third throttling component such as the electronic expansion valve EXV3 is in communication with the second port of the hot water side heat exchanger 10. In addition, an accumulator 5 is also provided between the second port of the third throttling component such as the electronic expansion valve EXV3 and the second port of the hot water side heat exchanger 10, and the valve assembly 40 includes a solenoid valve SV and a single To valve V1.

[0092] The control module 50 is used to determine whether the heat recovery air-cooled heat pump chiller and hot water machine meets the oil return condition, and obtain the current of the heat recovery air-cooled heat pump chiller or hot water machine when the heat recovery air-cooled heat pump chiller or hot water machine meets the oil return condition Operation mode, and according to the current operation mode of the heat recovery air-cooled heat pump cold and hot water machine to control the heat recovery air-cooled heat pump cold and hot water machine to perform an oil return action.

[0093] According to an embodiment of the present invention, when the heat recovery air-cooled heat pump cold or hot water machine meets any of the following conditions, the control module 50 determines that the heat recovery air-cooled heat pump cold or hot water machine meets the oil return condition:

[0094] (1) The heat recovery air-cooled heat pump cold and hot water machine is powered on for the first time and the heat recovery air-cooled heat pump cold and hot water machine has been running for the first preset time, such as t1 hour;

[0095] (2) The compressor runs continuously for a second preset time, such as t2 hours, where the time is cleared when the compressor stops;

[0096] (3) The heat recovery air-cooled heat pump chiller and hot water machine has accumulated a third preset time of operation, such as t3 hours;

[0097] (4) The cumulative number of compressor openings reaches a preset number of times, such as N times.

[0098] In the embodiment of the present invention, the operation modes of the heat recovery air-cooled heat pump chiller and water heater include heating mode, cooling mode, heating and hot water mode, and cooling and heat recovery mode. When the current operating mode is the cooling mode, the control module 50 controls the heat recovery air-cooled heat pump chiller and hot water machine to switch to the hot water mode to run for the fourth preset time T for oil return; when the heat recovery air-cooled heat pump chiller or hot water machine When the current operating mode is the heating mode, the control module 50 controls the heat recovery air-cooled heat pump chiller and hot water machine to switch to the hot water mode to run for the fourth preset time T for oil return; when the heat recovery air-cooled heat pump cold and hot water When the current operating mode of the machine is the hot water mode, the control module 50 controls the heat recovery air-cooled heat pump cold and hot water machine to switch to the heating mode to operate for the fourth preset time T for oil return; when the heat recovery air-cooled heat pump is cold and hot When the current operation mode of the water machine is the cooling and heat recovery mode, the control module 50 controls the heat recovery air-cooled heat pump cold and hot water machine to switch to the cooling mode to operate for the fourth preset time T to return oil.

[0099] It should be noted that when the heat recovery air-cooled heat pump chiller and hot water machine is controlled to switch to the corresponding operation mode for oil return, the fan in the heat recovery air-cooled heat pump chiller and water machine adjusts the speed according to the current working conditions and system pressure.

[0100] Among them, t1, t2, t3 and T can be calibrated according to actual conditions.

[0101] According to an embodiment of the present invention, before the heat recovery air-cooled heat pump chiller and hot water machine switches to the corresponding operation mode for oil return, the control module 50 also controls the corresponding water pump in the corresponding operation mode to be in the on state to ensure the corresponding heat exchange The water flow of the device is in a normal state.

[0102] In addition, when the heat recovery air-cooled heat pump chiller or hot water machine is switched to the corresponding operation mode for oil return, if the high pressure side pressure of the heat recovery air-cooled heat pump chiller or hot water machine is greater than or equal to the preset pressure, the control module controls the heat recovery The air-cooled heat pump hot and cold water machine exits the oil return action.

[0103] According to the heat recovery air-cooled heat pump cold and hot water machine of the embodiment of the present invention, the control module controls the heat recovery air-cooled heat pump cold and hot water machine to perform the oil return action by determining whether the heat recovery air-cooled heat pump cold and hot water machine meets the oil return condition. Specifically, after judging that the heat recovery air-cooled heat pump cold and hot water machine meets the oil return condition, the heat recovery air-cooled heat pump cold and hot water machine is controlled to perform the oil return action according to the current operating mode of the heat recovery air-cooled heat pump cold and hot water machine, so as to be accurate Efficiently control the refrigerating oil in the unit to avoid deposits, ensure that the compressor is always in a safe lubrication state, and ensure the safe and reliable operation of the unit.

[0104] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the pointed device or element It must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0105] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0106] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal communication of two components or the interaction relationship between two components, unless otherwise specified The limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] In the present invention, unless otherwise clearly defined and defined, the first feature "on" or "under" the second feature may be in direct contact with the first and second features, or indirectly through an intermediary. contact. Moreover, the "above", "above" and "above" of the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or it simply means that the level of the first feature is higher than the second feature. The first feature "below", "below" and "below" the second feature can mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

[0108] In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structure, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the characteristics of the different embodiments or examples described in this specification without contradicting each other.

[0109] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. A person of ordinary skill in the art can comment on the above-mentioned embodiments within the scope of the present invention. The embodiment undergoes changes, modifications, replacements and modifications.