Cold and hot water unit, control method and device thereof and computer readable storage medium

Abstract

The embodiment of the invention provides a water chiller-heater unit, a control method and device thereof and a computer readable storage medium, and the control method of the water chiller-heater unit comprises the steps that in response to a received heating starting instruction, the water chiller-heater unit is controlled to start and enter a refrigeration mode; determining whether an advanced reversing condition of the reversing valve is met or not; in response to determining that the advanced reversing condition of the reversing valve is met, the reversing valve is controlled to reverse, so that the cold and hot water unit is switched to a heating mode from a refrigerating mode; and in response to the fact that the advanced reversing condition of the reversing valve is not met, after the water chiller-heater unit operates in the refrigeration mode for a first preset duration, the reversing valve is controlled to reverse so that the water chiller-heater unit can be switched to the heating mode from the refrigeration mode, and the first preset duration is longer than a second preset duration.

Description

Technical Field

[0001] The present application relates to the technical field of hot and cold water units, and in particular to a hot and cold water unit and a control method, device, and computer-readable storage medium thereof. Background Art

[0002] In the related art, when the hot and cold water unit is turned on for heating, there is a certain risk that the hot and cold water unit will be damaged and unable to operate normally for heating. For example, when the hot and cold water unit is switched to the heating mode after starting, the water-side heat exchanger in the hot and cold water unit is prone to ice and cracking, causing serious damage to the water-side heat exchanger, which in turn causes the hot and cold water unit to be unable to operate normally for heating. Summary of the invention

[0003] The embodiments of the present application provide a hot and cold water unit and a control method, device, and computer-readable storage medium thereof, which can control the reversing valve to reverse in advance when the hot and cold water unit is at risk of damage, such as freezing of the water-side heat exchanger, to ensure the safe and normal operation of the hot and cold water unit.

[0004] In a first aspect, an embodiment of the present application provides a control method for a hot and cold water unit, wherein the hot and cold water unit comprises a refrigerant circuit, a coolant circuit and a water-side heat exchanger, wherein the refrigerant circuit and the coolant circuit are connected for heat exchange via the water-side heat exchanger, a reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger, wherein the control method for the hot and cold water unit comprises: in response to receiving a heating start instruction, controlling the hot and cold water unit to start and enter a cooling mode; determining whether an early reversing condition of the reversing valve is satisfied; in response to determining that the early reversing condition of the reversing valve is satisfied, controlling the reversing valve to switch so that the hot and cold water unit switches from a cooling mode to a heating mode; in response to determining that the early reversing condition of the reversing valve is not satisfied, controlling the reversing valve to switch after the hot and cold water unit runs in a cooling mode for a first preset period of time so that the hot and cold water unit switches from a cooling mode to a heating mode.

[0005] In some embodiments, determining whether the early reversing condition of the reversing valve is met includes: determining whether the duration time that the water side heat exchanger is in a preset state reaches a second preset time length, the first preset time length being greater than the second preset time length; in response to determining that the duration time that the water side heat exchanger is in the preset state reaches the second preset time length, determining that the early reversing condition of the reversing valve is met; in response to determining that the duration time that the water side heat exchanger is in the preset state does not reach the second preset time length, determining that the early reversing condition of the reversing valve is not met; the preset state includes at least one of the following states: the refrigerant pressure of the water side heat exchanger is less than or equal to the preset pressure; the refrigerant flow rate of the water side heat exchanger is less than or equal to the preset flow rate.

[0006] In some embodiments, a compressor is provided on the refrigerant circuit, and the compressor is connected to the reversing valve; a circulating pump is provided on the coolant circuit, and the circulating pump is connected to the coolant side of the water-side heat exchanger; the hot and cold water unit is controlled to start and enter the cooling mode, including: controlling the circulation pump to start; after the circulation pump starts and runs for a third preset time, controlling the compressor to start and controlling the reversing valve to be in a cooling conduction state, so that the hot and cold water unit enters the cooling mode.

[0007] In some embodiments, the hot and cold water unit includes an outdoor fan; controlling the start of the circulation pump includes: controlling the synchronous start of the circulation pump and the outdoor fan.

[0008] In some embodiments, the refrigerant circuit includes a heat exchange flow path, a heat-using flow path and a bypass flow path, one end of the heat-using flow path is connected to one end of the heat exchange flow path, and both ends of the bypass flow path are respectively connected to both ends of the heat exchange flow path in a one-to-one correspondence; the refrigerant side of the water-side heat exchanger and the circulating pump are arranged in series on the heat exchange flow path, the heat-using flow path is provided with a heat-using end and a first switch control valve connected in series in sequence, and the bypass flow path is provided with a second switch control valve; before controlling the circulation pump to start, the hot and cold water unit control method includes: controlling the first switch control valve to be cut off, and controlling the second switch control valve to be turned on.

[0009] In some embodiments, after controlling the reversing valve to switch direction, the hot and cold water unit control method includes: controlling the first switch control valve to be turned on, and controlling the second switch control valve to be turned off.

[0010] In some embodiments, the hot and cold water unit includes a compressor and an outdoor fan, the compressor is arranged on the refrigerant circuit and is connected to the reversing valve; controlling the hot and cold water unit to start and enter the cooling mode includes: controlling the outdoor fan to start; after the outdoor fan starts and runs for a fourth preset time, controlling the compressor to start and controlling the reversing valve to be in a cooling conduction state, so that the hot and cold water unit enters the cooling mode.

[0011] In a second aspect, an embodiment of the present application provides a control device for a hot and cold water unit, comprising: a starting circuit, configured to control the hot and cold water unit to start and enter a cooling mode in response to receiving a heating start instruction; a reversing circuit, configured to perform the following operations: determining whether an early reversing condition of the reversing valve is met; in response to determining that the early reversing condition of the reversing valve is met, controlling the reversing of the reversing valve to switch the hot and cold water unit from a cooling mode to a heating mode; in response to determining that the early reversing condition of the reversing valve is not met, controlling the reversing of the reversing valve after the hot and cold water unit runs in a cooling mode for a first preset period of time to switch the hot and cold water unit from a cooling mode to a heating mode.

[0012] In a third aspect, an embodiment of the present application provides a hot and cold water unit, comprising: a refrigerant circuit, a coolant circuit and a water-side heat exchanger, wherein the refrigerant circuit and the coolant circuit are connected for heat exchange via the water-side heat exchanger, a reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger; a memory storing a computer program; and a processor, wherein when the computer program is executed by the processor, a control method for the hot and cold water unit as described in any of the above embodiments is implemented.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the above-mentioned method for controlling a cold and hot water unit.

[0014] The control method for the hot and cold water units provided in the embodiment of the present application first controls the hot and cold water units to start and enter the cooling mode, and then continuously monitors whether the early reversing condition of the reversing valve is met. When the early reversing condition of the reversing valve is not met, the hot and cold water units are controlled to continue to operate in the cooling mode for a first preset time period, and then the reversing valve is controlled. When the early reversing condition of the reversing valve is met, the reversing valve is controlled to be reversed in advance, so that the hot and cold water units are switched from the cooling mode to the heating mode in advance, thereby eliminating the risk of damage to the operation of the hot and cold water units and ensuring the safe and normal operation of the hot and cold water units. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a flow chart of a method for controlling a hot and cold water unit provided in some embodiments of the present application;

[0017] Figure 2 It is a partial flow chart of a method for controlling a hot and cold water unit provided in some embodiments of the present application;

[0018] Figure 3 is another partial flow chart of the hot and cold water unit control method provided in some embodiments of the present application;

[0019] Figure 4 is another partial flow chart of the hot and cold water unit control method provided in some embodiments of the present application;

[0020] Figure 5 is another partial flow chart of the hot and cold water unit control method provided in some embodiments of the present application;

[0021] Figure 6 is a connection structure diagram of a hot and cold water unit provided in some embodiments of the present application;

[0022] Figure 7 This is another connection structure diagram of the hot and cold water units provided in some embodiments of the present application.

[0023] Description of main component symbols:

[0024] 1-hot and cold water unit, 10-refrigerant circuit, 11-reversing valve, 12-compressor, 13-outdoor heat exchanger, 20-refrigerant circuit, 21-heat exchange flow path, 211-circulating pump, 22-heat flow path, 221-heat end, 222-first switch control valve, 23-bypass flow path, 231-second switch control valve, 30-water side heat exchanger, 40-outdoor fan. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0028] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0029] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0030] In the related art, when the hot and cold water unit is turned on for heating, the hot and cold water unit needs to first enter the cooling mode, and then switch to the heating mode after running in the cooling mode for a preset time. In this process, there is a certain risk that the hot and cold water unit will be damaged and unable to heat normally. For example, the water-side heat exchanger in the hot and cold water unit is prone to ice and cracking, causing serious damage to the water-side heat exchanger, which in turn causes the hot and cold water unit to be unable to heat normally.

[0031] like Figure 1 As shown, in the first aspect, an embodiment of the present application provides a control method for a hot and cold water unit, which includes S10~S40, and can control the reversing valve 11 to reverse in advance when the hot and cold water unit 1 is at risk of damage, such as freezing of the water side heat exchanger 30, to ensure the safe and normal operation of the hot and cold water unit 1.

[0032] like Figure 6 and Figure 7 As shown, the hot and cold water unit 1 includes a refrigerant circuit 10, a secondary refrigerant circuit 20 and a water-side heat exchanger 30; a reversing valve 11 is provided on the refrigerant circuit 10, and the water-side heat exchanger 30 has a refrigerant side and a secondary refrigerant side arranged opposite to each other, and the reversing valve 11 is connected to the refrigerant side of the water-side heat exchanger 30. The refrigerant circuit 10 and the secondary refrigerant circuit 20 are connected by heat exchange through the water-side heat exchanger 30, so that the refrigerant circuit 10 provides cold energy to the secondary refrigerant circuit 20 through the water-side heat exchanger 30, and the secondary refrigerant circuit 20 transfers the obtained cold energy to the battery in the energy storage system, so as to use the cold energy to cool and dissipate the heat of the battery in the energy storage system.

[0033] For the refrigerant circuit 10 and the secondary coolant circuit 20 connected for heat exchange, the medium between the refrigerant circuit 10 and the secondary coolant circuit 20 is isolated from each other, and heat is exchanged when flowing through the water-side heat exchanger 30 located between the two circuits. Here, the refrigerant circuit 10 carries a refrigerant that can circulate, and the secondary coolant circuit 20 carries a secondary coolant such as water that can circulate; the water-side heat exchanger 30 is provided with at least two flow channels isolated from each other, namely a first flow channel and a second flow channel, the first flow channel is located on the refrigerant side of the water-side heat exchanger 30, and the second flow channel is located on the secondary coolant side of the water-side heat exchanger 30; the water-side heat exchanger 30 is connected to the refrigerant circuit 10 through the first flow channel, the reversing valve 11 is connected to the first flow channel, and the refrigerant flows through the water-side heat exchanger 30 through the first flow channel; the water-side heat exchanger 30 is connected to the secondary coolant circuit 20 through the second flow channel, and the secondary coolant flows through the water-side heat exchanger 30 through the second flow channel. In this way, the refrigerant and the brine can exchange heat when flowing through the water-side heat exchanger 30 , thereby achieving a heat exchange connection between the refrigerant circuit 10 and the brine circuit 20 .

[0034] S10: In response to receiving the heating start instruction, the hot and cold water unit 1 is controlled to start and enter the cooling mode.

[0035] Here, the heating start instruction may be a start-up and heating operation instruction issued by a user, which may be sent to the hot and cold water unit 1 through an input terminal such as a control panel, a remote controller, or a remote control terminal. When the heating start instruction is received, the hot and cold water unit 1 is controlled to start up, and enter the cooling mode first after starting up.

[0036] S20: Determine whether the early reversing condition of the reversing valve 11 is met.

[0037] Here, the early reversing condition of the reversing valve 11 can be pre-set in the controller of the hot and cold water unit 1, and used as a judgment condition for whether it is necessary to control the reversing valve 11 to be reversed in advance. The early reversing condition of the reversing valve 11 can be determined according to actual use needs, and can include at least one risk condition, each judgment condition is used to judge a type of operation risk when the hot and cold water unit 1 is started and operates in the cooling mode. For example, the early reversing condition of the reversing valve 11 may include: there is a risk of freezing and cracking of the water side heat exchanger 30.

[0038] S30: In response to determining that the early reversing condition of the reversing valve 11 is met, the reversing valve 11 is controlled to switch so that the hot and cold water unit 1 is switched from the cooling mode to the heating mode.

[0039] When it is determined that the reversing condition of the reversing valve 11 is met, it means that the hot and cold water unit 1 is at risk of damage in the current cooling operation; if the hot and cold water unit 1 continues to operate in the cooling mode, the hot and cold water unit 1 is susceptible to damage. At this time, the reversing valve 11 can be controlled to reverse immediately, so that the hot and cold water unit 1 is switched from the cooling mode to the heating mode immediately, so as to eliminate the operating risk of the hot and cold water unit 1.

[0040] S40: In response to determining that the early reversing condition of the reversing valve 11 is not met, after the hot and cold water unit 1 operates in the cooling mode for a first preset time, the reversing valve 11 is controlled to switch so that the hot and cold water unit 1 switches from the cooling mode to the heating mode. Here, the first preset time can be pre-set in the controller of the hot and cold water unit 1; the specific value of the first preset time can be determined according to actual needs, and the embodiment of the present application does not limit this.

[0041] When the early reversing condition of the reversing valve 11 is not met, it means that the hot and cold water unit 1 has not been damaged in the current cooling operation, and the hot and cold water unit 1 can continue to operate safely in the cooling mode for a first preset time. Then, the reversing valve 11 is controlled to switch, so that the hot and cold water unit 1 switches from the cooling mode to the heating mode.

[0042] Compared with the related art, the hot and cold water unit control method provided in the embodiment of the present application first controls the hot and cold water unit 1 to start and enter the cooling mode, and then continuously monitors whether the early reversing condition of the reversing valve 11 is met. When the early reversing condition of the reversing valve 11 is not met, the hot and cold water unit 1 is controlled to continue to operate in the cooling mode for a first preset time, and then the reversing valve 11 is controlled to reverse. When the early reversing condition of the reversing valve 11 is met, the reversing valve 11 is controlled to reverse in advance, so that the hot and cold water unit 1 switches from the cooling mode to the heating mode in advance, thereby eliminating the risk of damage to the operation of the hot and cold water unit 1 and ensuring the safe and normal operation of the hot and cold water unit 1.

[0043] like Figure 2 As shown, in some embodiments, S20 may include S21-S23.

[0044] S21: Determine whether the duration of the water-side heat exchanger 30 being in the preset state reaches a second preset time, and the first preset time is greater than the second preset time. Here, the second preset time can be pre-set in the controller of the hot and cold water unit 1; the specific value of the second preset time can be determined according to actual needs, and the embodiment of the present application does not limit this.

[0045] Here, the preset state may include at least one of the following states: the refrigerant pressure of the water-side heat exchanger 30 is less than or equal to the preset pressure; the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to the preset flow rate. The preset pressure can be pre-set in the controller of the hot and cold water unit 1 to reflect whether there is a risk of freezing on the refrigerant side of the water-side heat exchanger 30; the specific value of the preset pressure can be determined according to actual needs, and the embodiment of the present application is not limited to this; the refrigerant pressure of the water-side heat exchanger 30 can be measured by a pressure sensor. The preset flow rate can be pre-set in the controller of the hot and cold water unit 1 to reflect whether there is a risk of freezing on the refrigerant side of the water-side heat exchanger 30; the specific value of the preset flow rate can be determined according to actual needs, and the embodiment of the present application is not limited to this; the refrigerant flow rate of the water-side heat exchanger 30 can be measured by a flow sensor.

[0046] S22: In response to determining that the duration of the water-side heat exchanger 30 being in the preset state reaches a second preset time length, determining that an early reversing condition of the reversing valve 11 is satisfied.

[0047] S23: In response to determining that the duration of the water-side heat exchanger 30 being in the preset state does not reach a second preset time length, determining that the early reversing condition of the reversing valve 11 is not satisfied.

[0048] In some examples, the preset state may be that the refrigerant pressure of the water-side heat exchanger 30 is less than or equal to the preset pressure. If the refrigerant pressure of the water-side heat exchanger 30 is less than or equal to the preset pressure within the continuous second preset time, for example, the second preset time may be 2 minutes, and the refrigerant pressure of the water-side heat exchanger 30 is less than or equal to the preset pressure for 2 consecutive minutes, it indicates that there is a risk of freezing and a risk of freezing cracking caused by freezing on the refrigerant side of the water-side heat exchanger 30. At this time, it can be determined that the early reversing condition of the reversing valve 11 is met, and the reversing valve 11 can be reversed in advance to eliminate the risk of damage. If the duration of the water-side heat exchanger 30 being in a state where the refrigerant pressure is less than or equal to the preset pressure does not reach the second preset time, for example, the second preset time may be 2 minutes, and the duration of the refrigerant pressure of the water-side heat exchanger 30 being less than or equal to the preset pressure is less than 2 minutes, it indicates that there is no risk of freezing on the refrigerant side of the water-side heat exchanger 30, and the reversing valve 11 does not need to be reversed in advance.

[0049] In other examples, the preset state may be that the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to the preset flow rate. If the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to the preset flow rate within the continuous second preset time, for example, the second preset time may be 2 minutes, and the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to the preset pressure within 2 consecutive minutes, it means that there is a risk of freezing and a risk of freezing cracking caused by freezing on the refrigerant side of the water-side heat exchanger 30. At this time, it can be determined that the early reversing conditions of the reversing valve 11 are met, and the reversing valve 11 can be reversed in advance to eliminate the risk of damage. If the duration of the state in which the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to the preset flow rate does not reach the second preset time, for example, the second preset time may be 2 minutes, and the duration of the refrigerant flow rate of the water-side heat exchanger 30 being less than or equal to the preset pressure is less than 2 minutes, it means that there is no risk of freezing on the refrigerant side of the water-side heat exchanger 30, and the reversing valve 11 does not need to be reversed in advance.

[0050] By setting S21~S23, it is possible to more accurately determine whether there is a risk after the hot and cold water unit 1 is started and operates in the cooling mode, and then the reversing valve 11 can be promptly controlled to reverse in advance when there is a risk, thereby timely and accurately eliminating the risk of damage to the hot and cold water unit 1.

[0051] like Figure 6 and Figure 7 As shown, in some embodiments, the refrigerant circuit 10 may be provided with a compressor 12, and the compressor 12 is connected to the reversing valve 11. The secondary coolant circuit 20 may be provided with a circulating pump 211, and the circulating pump 211 is connected to the secondary coolant side of the water-side heat exchanger 30, for example, through a second flow channel. Figure 3 As shown, S10 may include S11-S12.

[0052] S11: Control the circulation pump 211 to start. When the heating start instruction is received, the circulation pump 211 can be controlled to start so that the brine in the brine circuit 20 resumes circulating flow first.

[0053] S12: After the circulation pump 211 starts to run for the third preset time, the compressor 12 is controlled to start and the reversing valve 11 is controlled to be in a cooling conduction state, so that the hot and cold water unit 1 enters the cooling mode. Here, the third preset time can be pre-set in the controller of the hot and cold water unit 1; the specific value of the third preset time can be determined according to actual needs, and the embodiment of the present application does not limit this.

[0054] After the circulation pump 211 starts running for the third preset time, it can be determined that the brine in the brine loop 20 has resumed normal circulation, and the heat exchange purpose of the refrigerant loop 10 and the brine loop 20 in the water side heat exchanger 30 can be achieved. At this time, the compressor 12 can be controlled to start and the reversing valve 11 can be controlled to be in a refrigeration conduction state, and the compressor 12 can be used to drive the refrigerant to perform a refrigeration cycle in the refrigerant loop 10.

[0055] Here, the reversing valve 11 can have a cooling conduction state and a heating conduction state; illustratively, the reversing valve 11 can be in the cooling conduction state when the power is off, and can be reversed when the power is on to switch from the cooling conduction state to the heating conduction state. After the circulation pump 211 starts to run for a third preset time, the compressor 12 is controlled to start and the reversing valve 11 is controlled to be in the power-off state, so that the hot and cold water unit 1 enters the cooling mode.

[0056] In some examples, the hot and cold water unit 1 may include an outdoor fan 40. Here, S11 may include S11'.

[0057] S11': Control the circulation pump 211 and the outdoor fan 40 to start synchronously. When the heating start instruction is received, the circulation pump 211 and the outdoor fan 40 can be controlled to start synchronously. On the one hand, the circulation pump 211 is used to restore the circulation of the brine in the brine loop 20, and on the other hand, the outdoor fan 40 is used to restore the circulation of the air around the outdoor heat exchanger 13, thereby reducing the exhaust pressure of the compressor 12 when entering the cooling mode to avoid triggering the high-pressure protection shutdown.

[0058] like Figure 6 and Figure 7 As shown, in some examples, the refrigerant circuit 20 may include a heat exchange flow path 21, a heat flow path 22, and a bypass flow path 23. The refrigerant side of the water-side heat exchanger 30 and the circulating pump 211 are arranged in series on the heat exchange flow path 21, and one end of the heat flow path 22 is connected to one end of the heat exchange flow path 21; the heat flow path 22 is provided with a heat end 221 and a first switch control valve 222 connected in series in sequence, and the first switch control valve 222 is used to control the on and off of the heat flow path 22. Figure 6 As shown, for example, the heat end 221 can be a faucet / shower, and the heat flow path 22 can be a water supply flow path with a faucet / shower; one end of the heat flow path 22 is connected to one end of the heat exchange flow path 21, and the faucet / shower is the end of the heat flow path 22 away from the heat exchange flow path 21. Figure 7As shown, and exemplarily, the heat end 221 can be a heating plate / floor heating pipe, and the heat flow path 22 can be a heating flow path / floor heating flow path; the two ends of the heat flow path 22 are respectively connected to the two ends of the heat exchange flow path 21 one by one, that is, one end of the heat flow path 22 is connected to the end of the refrigerant side away from the circulation pump 211, and the other end of the heat flow path 22 is connected to the end of the circulation pump 211 away from the refrigerant side, so that the heat flow path 22 and the heat exchange flow path 21 are connected to form a heating circulation loop.

[0059] The two ends of the bypass flow path 23 are connected to the two ends of the heat exchange flow path 21 in a one-to-one correspondence, that is, one end of the bypass flow path 23 is connected to the end of the refrigerant side away from the circulating pump 211, and the other end of the bypass flow path 23 is connected to the end of the circulating pump 211 away from the refrigerant side. A second switch control valve 231 is provided on the bypass flow path 23, and the second switch control valve 231 is used to control the on-off of the bypass flow path 23. Figure 4 As shown, before S11, the hot and cold water unit control method may include S101.

[0060] S101: Control the first switch control valve 222 to be turned off, and control the second switch control valve 231 to be turned on.

[0061] When receiving the heating start instruction, the first switch control valve 222 can be controlled to be closed first, so as to disconnect the heat flow path 22 and the heat exchange flow path 21, and the second switch control valve 231 can be controlled to be connected, so as to connect the bypass flow path 23 and the heat exchange flow path 21 to form a bypass circulation loop, and then the circulation pump 211 can be controlled to start. In this way, driven by the circulation pump 211, the refrigerant will circulate along the heat exchange flow path 21 and the bypass flow path 23, so as to avoid the lower temperature refrigerant entering the heat flow path 22 and accidentally releasing cold water or causing an unexpected decrease in the indoor ambient temperature, thereby ensuring the user's comfort.

[0062] Exemplarily, after S30 or S40, the hot and cold water unit control method may include S50.

[0063] S50: Control the first switch control valve 222 to be turned on, and control the second switch control valve 231 to be turned off.

[0064] After the hot and cold water unit 1 is controlled to switch from the cooling mode to the heating mode, the first switch control valve 222 can be controlled to be turned on so that the heat flow path 22 and the heat exchange flow path 21 are connected to form a heating circulation loop, and the second switch control valve 231 can be controlled to be turned off so that the bypass flow path 23 and the heat exchange flow path 21 are disconnected. In this way, driven by the circulation pump 211, the refrigerant will circulate along the heat exchange flow path 21 and the bypass flow path 23 to absorb heat at the water side heat exchanger 30 and release it at the heat terminal 221, thereby providing hot water with a suitable temperature or heating the indoor air, thereby better meeting the user's needs for hot water supply or heating.

[0065] Exemplarily, after the hot and cold water unit 1 runs in the heating mode for the fifth preset time, the first switch control valve 222 can be controlled to be turned on, and the second switch control valve 231 can be controlled to be turned off to ensure that the temperature of the brine has risen to a more suitable temperature range. Another exemplary method is to continuously monitor the outlet water temperature of the brine side of the water side heat exchanger 30 after the hot and cold water unit 1 runs in the heating mode for the fifth preset time, and after the outlet water temperature of the brine side reaches the preset temperature, the first switch control valve 222 can be controlled to be turned on and the second switch control valve 231 can be controlled to be turned off to ensure that the temperature of the brine has risen to a more suitable temperature range. Here, the fifth preset time can be pre-set in the controller of the hot and cold water unit 1; the specific value of the fifth preset time can be determined according to actual needs, and the embodiment of the present application is not limited to this. Here, the preset temperature can be pre-set in the controller of the hot and cold water unit 1; the specific value of the preset temperature can be determined according to actual needs, and the embodiment of the present application is not limited to this.

[0066] In some embodiments, the hot and cold water unit 1 may include a compressor 12 and an outdoor fan 40. The compressor 12 is disposed on the refrigerant circuit 10 and is connected to the reversing valve 11. Figure 5 As shown, S10 may include S13-S14.

[0067] S13: Control the outdoor fan 40 to start. When the heating start instruction is received, the outdoor fan 40 can be controlled to start, and the air around the outdoor heat exchanger 13 is first restored to circulate by the outdoor fan 40, thereby reducing the exhaust pressure of the compressor 12 when entering the cooling mode, so as to avoid triggering the high pressure protection shutdown.

[0068] S14: After the outdoor fan 40 starts running for a fourth preset time, the compressor 12 is controlled to start and the reversing valve 11 is controlled to be in a cooling conduction state, so that the hot and cold water unit 1 enters a cooling mode.

[0069] After the outdoor fan 40 starts running for a fourth preset time, it can be determined that the air around the outdoor heat exchanger 13 has resumed normal circulation. At this time, the compressor 12 can be controlled to start and the reversing valve 11 can be controlled to be in a refrigeration conduction state, and the compressor 12 can be used to drive the refrigerant to perform a refrigeration cycle in the refrigerant circuit 10.

[0070] In a second aspect, an embodiment of the present application provides a control device for a hot and cold water unit, the control device comprising: a starting circuit, configured to control the hot and cold water unit 1 to start and enter a cooling mode in response to receiving a start heating instruction; a reversing circuit, configured to perform the following operations: determining whether the early reversing condition of the reversing valve 11 is met; in response to determining that the early reversing condition of the reversing valve 11 is met, controlling the reversing valve 11 to reverse so that the hot and cold water unit 1 switches from the cooling mode to the heating mode; in response to determining that the early reversing condition of the reversing valve 11 is not met, after the hot and cold water unit 1 runs in the cooling mode for a first preset time, controlling the reversing valve 11 to reverse so that the hot and cold water unit 1 switches from the cooling mode to the heating mode, the first preset time being greater than the second preset time.

[0071] like Figure 6 and Figure 7 As shown, in a third aspect, an embodiment of the present application provides a hot and cold water unit 1, which includes a refrigerant circuit 10, a secondary refrigerant circuit 20, a water-side heat exchanger 30, a processor and a memory. The refrigerant circuit 10 and the secondary refrigerant circuit 20 are connected for heat exchange via the water-side heat exchanger 30, and a reversing valve 11 is provided on the refrigerant circuit 10, and the reversing valve 11 is connected to the refrigerant side of the water-side heat exchanger 30. The memory stores a computer program, and when the computer program is executed by the processor, a control method for the hot and cold water unit provided in any of the above embodiments is implemented.

[0072] The processor is connected to the memory and can perform various actions and processes according to the program stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can be an X86 architecture or an ARM architecture.

[0073] The memory may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronously linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory of the method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0074] In some embodiments, a compressor 12 may be provided on the refrigerant circuit 10, and the compressor 12 is connected to the reversing valve 11. A circulating pump 211 may be provided on the refrigerant circuit 20, and the circulating pump 211 is connected to the refrigerant side of the water-side heat exchanger 30, for example, through a second flow channel. In some examples, the hot and cold water unit 1 may include an outdoor fan 40 and an outdoor heat exchanger 13, and the outdoor fan 40 and the outdoor heat exchanger 13 are correspondingly arranged, and the outdoor heat exchanger 13 is arranged on the refrigerant circuit 20 and is connected to the reversing valve 11.

[0075] In some examples, the refrigerant circuit 20 may include a heat exchange flow path 21, a heat flow path 22, and a bypass flow path 23. The refrigerant side of the water-side heat exchanger 30 and the circulating pump 211 are arranged in series on the heat exchange flow path 21, and one end of the heat flow path 22 is connected to one end of the heat exchange flow path 21; the heat flow path 22 is provided with a heat end 221 and a first switch control valve 222 connected in series in sequence, and the first switch control valve 222 is used to control the on-off of the heat flow path 22. The two ends of the bypass flow path 23 are respectively connected to the two ends of the heat exchange flow path 21 in a one-to-one correspondence, that is, one end of the bypass flow path 23 is connected to the end of the refrigerant side away from the circulating pump 211, and the other end of the bypass flow path 23 is connected to the end of the circulating pump 211 away from the refrigerant side. The bypass flow path 23 is provided with a second switch control valve 231, and the second switch control valve 231 is used to control the on-off of the bypass flow path 23.

[0076] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0077] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks or key drives, etc.). The various computer-readable storage media described in the embodiments of the present application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0078] The above is a detailed introduction to a hot and cold water unit and its control method, device, and computer-readable storage medium provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for controlling a hot and cold water unit, characterized in that: The hot and cold water unit comprises a refrigerant circuit, a secondary refrigerant circuit and a water-side heat exchanger, wherein the refrigerant circuit and the secondary refrigerant circuit are connected for heat exchange via the water-side heat exchanger, a reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger, and the control method of the hot and cold water unit comprises: In response to receiving a heating start instruction, controlling the hot and cold water unit to start and enter a cooling mode; Determine whether the early reversing condition of the reversing valve is met; In response to determining that the early reversing condition of the reversing valve is met, controlling the reversing valve to switch the cold and hot water unit from a cooling mode to a heating mode; In response to determining that the early reversing condition of the reversing valve is not met, after the hot and cold water unit operates in the cooling mode for a first preset period of time, the reversing valve is controlled to switch so that the hot and cold water unit switches from the cooling mode to the heating mode.

2. The method for controlling a hot and cold water unit according to claim 1, characterized in that: Determine whether the conditions for early reversing of the reversing valve are met, including: Determine whether the duration of the water-side heat exchanger being in a preset state reaches a second preset time length, and the first preset time length is greater than the second preset time length; In response to determining that the duration of the water-side heat exchanger being in the preset state reaches a second preset time length, determining that an early reversing condition of the reversing valve is satisfied; In response to determining that the duration of the water-side heat exchanger being in the preset state does not reach a second preset time length, determining that an early reversing condition of the reversing valve is not satisfied; The preset state includes at least one of the following states: the refrigerant pressure of the water-side heat exchanger is less than or equal to the preset pressure; the refrigerant flow rate of the water-side heat exchanger is less than or equal to the preset flow rate.

3. The method for controlling a hot and cold water unit according to claim 1, characterized in that: The refrigerant circuit is provided with a compressor, and the compressor is connected to the reversing valve; the secondary coolant circuit is provided with a circulating pump, and the circulating pump is connected to the secondary coolant side of the water-side heat exchanger; and the hot and cold water unit is controlled to start and enter the cooling mode, including: Controlling the circulation pump to start; After the circulation pump starts running for a third preset time, the compressor is controlled to start and the reversing valve is controlled to be in a cooling conduction state, so that the hot and cold water unit enters a cooling mode.

4. The method for controlling a hot and cold water unit according to claim 3, characterized in that: The hot and cold water unit includes an outdoor fan; controlling the start of the circulation pump includes: The circulation pump and the outdoor fan are controlled to start synchronously.

5. The method for controlling a hot and cold water unit according to claim 3, characterized in that: The refrigerant circuit includes a heat exchange flow path, a heat flow path and a bypass flow path, one end of the heat flow path is connected to one end of the heat exchange flow path, and the two ends of the bypass flow path are respectively connected to the two ends of the heat exchange flow path in a one-to-one correspondence; the refrigerant side of the water-side heat exchanger and the circulating pump are arranged in series on the heat exchange flow path, the heat flow path is provided with a heat end and a first switch control valve connected in series in sequence, and the bypass flow path is provided with a second switch control valve; before controlling the circulation pump to start, the hot and cold water unit control method includes: The first switch control valve is controlled to be cut off, and the second switch control valve is controlled to be turned on.

6. The method for controlling a hot and cold water unit according to claim 5, characterized in that: After controlling the reversing valve to change direction, the hot and cold water unit control method includes: The first switch control valve is controlled to be turned on, and the second switch control valve is controlled to be turned off.

7. The method for controlling a hot and cold water unit according to claim 1, characterized in that: The hot and cold water unit comprises a compressor and an outdoor fan, wherein the compressor is arranged on the refrigerant circuit and is connected to the reversing valve; controlling the hot and cold water unit to start and enter a cooling mode comprises: Controlling the outdoor fan to start; After the outdoor fan starts running for a fourth preset time, the compressor is controlled to start and the reversing valve is controlled to be in a cooling conduction state, so that the hot and cold water unit enters a cooling mode.

8. A control device for a hot and cold water unit, characterized in that: The hot and cold water unit comprises a refrigerant circuit, a secondary refrigerant circuit and a water-side heat exchanger, wherein the refrigerant circuit and the secondary refrigerant circuit are connected for heat exchange via the water-side heat exchanger, a reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger, and the hot and cold water unit control device comprises: A start-up circuit, configured to control the hot and cold water unit to start and enter a cooling mode in response to receiving a start-up heating instruction; The commutation circuit is configured to perform the following operations: Determine whether the early reversing condition of the reversing valve is met; In response to determining that the early reversing condition of the reversing valve is met, controlling the reversing valve to switch the cold and hot water unit from a cooling mode to a heating mode; In response to determining that the early reversing condition of the reversing valve is not met, after the hot and cold water unit operates in the cooling mode for a first preset period of time, the reversing valve is controlled to switch so that the hot and cold water unit switches from the cooling mode to the heating mode.

9. A hot and cold water unit, characterized in that: include: A refrigerant circuit, a secondary refrigerant circuit and a water-side heat exchanger, wherein the refrigerant circuit and the secondary refrigerant circuit are connected for heat exchange via the water-side heat exchanger, a reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger; a memory storing a computer program; A processor, wherein when the computer program is executed by the processor, the method for controlling a hot and cold water unit according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the method for controlling a hot and cold water unit according to any one of claims 1 to 7.

Images