Heat recovery unit and control method and control device of heat recovery unit

Abstract

The invention provides a heat recovery unit and a control method and device of the heat recovery unit. The heat recovery unit comprises a compressor, a condenser, an evaporator and an electronic expansion valve. The condenser is connected with a cooling water outlet pipe and a cooling water inlet pipe; the cooling water outlet pipe is respectively connected with a first water inlet pipe of the cooling tower and a second water inlet pipe of the hot water tank through a first three-way valve; the cooling tower is further provided with a first water outlet pipe and a first backflow pipe. The first water outlet pipe communicates with the first backflow pipe and the cooling water inlet pipe through a second three-way valve. The hot water tank is further provided with a second water outlet pipe and a second backflow pipe. The second water outlet pipe communicates with the second backflow pipe and the cooling water inlet pipe through a third three-way valve. According to the heat recovery unit, the heat recovery function and the refrigerating / heating function are achieved at the same time on the basis of one condenser, the overall structure of the unit is simplified, the manufacturing cost is reduced, control logic is simpler and convenient to achieve, and it can be guaranteed that the heat recovery unit is accurately controlled in different application modes.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment technology, and in particular to a heat recovery unit, a control method for the heat recovery unit, and a control device for the heat recovery unit. Background Art

[0002] In the related art, the heat recovery unit usually requires two independent condenser structures, which are complex in structure and high in cost. In addition, the procedures of the heat recovery unit in different application modes are cumbersome, and its control logic is also relatively complex, making it inconvenient to use. Summary of the invention

[0003] The present invention provides a heat recovery unit, a control method and a control device for the heat recovery unit, so as to solve the defects existing in the prior art and achieve the following technical effects: the heat recovery function and the cooling / heating function of the unit can be realized simultaneously on the basis of one condenser, thereby simplifying the overall structure of the unit and reducing the manufacturing cost; and its control logic is also simpler and easier to implement, so as to ensure accurate control of the heat recovery unit in different application modes.

[0004] A heat recovery unit according to an embodiment of the first aspect of the present invention comprises:

[0005] A compressor, a condenser, an evaporator and an electronic expansion valve interconnected by refrigerant pipes;

[0006] The condenser is connected to a cooling water outlet pipe and a cooling water inlet pipe, and the cooling water outlet pipe is connected to a first water inlet pipe of a cooling tower and a second water inlet pipe of a hot water tank respectively through a first three-way valve;

[0007] The cooling tower is also provided with a first water outlet pipe and a first return pipe, wherein the first water outlet pipe is connected to the first return pipe and the cooling water inlet pipe respectively through a second three-way valve;

[0008] The hot water tank is also provided with a second water outlet pipe and a second return pipe, and the second water outlet pipe is respectively connected with the second return pipe and the cooling water inlet pipe through a third three-way valve;

[0009] The heat recovery unit is suitable for switching between different working modes by controlling the opening degrees of the first three-way valve, the second three-way valve and the third three-way valve.

[0010] According to one embodiment of the present invention, the connection of the first three-way valve is as follows: port a is connected to the cooling water inlet pipe, port b is connected to the first inlet pipe, and port c is connected to the second inlet pipe; the connection of the second three-way valve is as follows: port a is connected to the first outlet pipe, port b is connected to the cooling water inlet pipe, and port c is connected to the first return pipe; the connection of the third three-way valve is as follows: port a is connected to the second outlet pipe, port b is connected to the cooling water inlet pipe, and port c is connected to the second return pipe;

[0011] Among them, when the openings of the first three-way valve, the second three-way valve and the third three-way valve are all 0%, the water flow direction is from port a to port b; when the openings of the first three-way valve, the second three-way valve and the third three-way valve are all 100%, the water flow direction is from port a to port c; when the openings of the first three-way valve, the second three-way valve and the third three-way valve are all between 0% and 100%, the water flow direction is partially from port a to port c and partially to port b.

[0012] According to one embodiment of the present invention, the heat recovery unit includes a full heat recovery mode, a partial heat recovery mode and a full cooling mode in the cooling mode;

[0013] Among them, in the full heat recovery mode, the opening of the first three-way valve is 100% and the opening of the third three-way valve is 0%; in the partial heat recovery mode, the openings of the first three-way valve, the second three-way valve and the third three-way valve are all between 0% and 100%; in the full cooling mode, the opening of the first three-way valve is 0% and the opening of the second three-way valve is 0%.

[0014] According to one embodiment of the present invention, the heat recovery unit in the heating mode also includes a full heat recovery mode, a partial heat recovery mode and a full heating mode;

[0015] Among them, in the full heat recovery mode, the opening of the first three-way valve is 100% and the opening of the third three-way valve is 0%; in the partial heat recovery mode, the openings of the first three-way valve, the second three-way valve and the third three-way valve are all between 0% and 100%; in the full heating mode, the opening of the first three-way valve is 0% and the opening of the second three-way valve is 0%.

[0016] According to a second embodiment of the present invention, a control method for a heat recovery unit based on the first embodiment of the present invention includes:

[0017] Get the actual hot water temperature in the hot water tank;

[0018] According to the actual hot water temperature, the opening degree of at least one of the first three-way valve, the second three-way valve and the third three-way valve is adjusted so that the heat recovery unit switches between different working modes.

[0019] According to an embodiment of the present invention, the step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the actual hot water temperature to control the heat recovery unit to switch between different working modes specifically includes:

[0020] Determining a refrigeration mode in which the heat recovery unit operates;

[0021] According to the interval range of the actual hot water temperature, the opening degree of at least one of the first three-way valve, the second three-way valve and the third three-way valve is adjusted to control the heat recovery unit to switch between full heat recovery mode, partial heat recovery mode and full cooling mode.

[0022] According to an embodiment of the present invention, the step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the interval range of the actual hot water temperature to control the heat recovery unit to switch between the full heat recovery mode, the partial heat recovery mode and the full cooling mode specifically includes:

[0023] According to the actual hot water temperature being lower than the first target temperature, controlling the opening of the first three-way valve to be 100% and the opening of the third three-way valve to be 0%, so as to control the heat recovery unit to enter the full heat recovery mode;

[0024] According to the actual hot water temperature being greater than or equal to the first target temperature and less than the second target temperature, the openings of the first three-way valve, the second three-way valve and the third three-way valve are controlled to be between 0% and 100%, so as to control the heat recovery unit to enter the partial heat recovery mode;

[0025] According to the actual hot water temperature being greater than or equal to the second target temperature, the opening of the first three-way valve is controlled to be 0% and the opening of the second three-way valve is controlled to be 0%, so as to control the heat recovery unit to enter the full cooling mode.

[0026] According to one embodiment of the present invention, in the partial heat recovery mode, the method further comprises:

[0027] Obtaining the actual cooling temperature and target cooling temperature of the cooling water outlet pipe;

[0028] According to the comparison result between the actual cooling temperature and the target cooling temperature, the opening of the first three-way valve is adjusted until the actual cooling temperature reaches the target cooling temperature.

[0029] According to an embodiment of the present invention, the step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the actual hot water temperature to control the heat recovery unit to switch between different working modes specifically includes:

[0030] Determining a heating mode in which the heat recovery unit operates;

[0031] According to the interval range of the actual hot water temperature, the opening degree of at least one of the first three-way valve, the second three-way valve and the third three-way valve is adjusted to control the heat recovery unit to switch between full heat recovery mode, partial heat recovery mode and full heating mode.

[0032] According to an embodiment of the present invention, the step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the interval range of the actual hot water temperature to control the heat recovery unit to switch between the full heat recovery mode, the partial heat recovery mode and the full heating mode specifically includes:

[0033] According to the actual hot water temperature being lower than the first target temperature, controlling the opening of the first three-way valve to be 100% and the opening of the third three-way valve to be 0%, so as to control the heat recovery unit to enter the full heat recovery mode;

[0034] According to the actual hot water temperature being greater than or equal to the first target temperature and less than the second target temperature, the openings of the first three-way valve, the second three-way valve and the third three-way valve are controlled to be between 0% and 100%, so as to control the heat recovery unit to enter the partial heat recovery mode;

[0035] According to the actual hot water temperature being greater than or equal to the second target temperature, the opening of the first three-way valve is controlled to be 0% and the opening of the second three-way valve is controlled to be 0%, so as to control the heat recovery unit to enter the full heating mode.

[0036] According to one embodiment of the present invention, in the all heating mode, the method further includes:

[0037] Obtaining an actual heating temperature and a target heating temperature of the cooling tower;

[0038] According to a comparison result between the actual heating temperature and the target heating temperature, the opening of the first three-way valve is adjusted until the actual heating temperature reaches the target heating temperature.

[0039] According to an embodiment of the present invention, during the process of controlling the heat recovery unit to switch between different working modes, within a switching interval between any two working modes, the opening degree of the first three-way valve is maintained at 50%.

[0040] According to a third aspect of the present invention, a control device for a heat recovery unit based on the first aspect of the present invention comprises:

[0041] An acquisition module is used to obtain the actual hot water temperature in the hot water tank;

[0042] The control module is used to adjust the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the actual hot water temperature, so as to control the heat recovery unit to switch between different working modes.

[0043] In order to solve the technical problems existing in the above-mentioned related technologies, the present invention provides a heat recovery unit. The unit can simultaneously realize the heat recovery function and cooling / heating function of the unit on the basis of a condenser by setting multiple three-way valves and combining the improvement of the pipeline structure, thereby simplifying the overall structure of the unit and reducing the manufacturing cost. The control logic is also simpler and easier to implement, which can ensure accurate control of the heat recovery unit in different application modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 This is one of the structural schematic diagrams of the heat recovery unit provided by the present invention;

[0046] Figure 2 This is the second structural schematic diagram of the heat recovery unit provided by the present invention;

[0047] Figure 3 It is a schematic flow chart of a control method of a heat recovery unit provided by the present invention;

[0048] Figure 4 It is a structural schematic diagram of a control device of a heat recovery unit provided by the present invention;

[0049] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention.

[0050] Reference numerals:

[0051] 1. Compressor; 2. Condenser; 21. Cooling water outlet pipe; 22. Cooling water inlet pipe;

[0052] 3. Evaporator; 4. Electronic expansion valve; 51. First three-way valve; 52. Second three-way valve; 53. Third three-way valve;

[0053] 6. Cooling tower; 61. First water inlet pipe; 62. First water outlet pipe; 63. First return pipe;

[0054] 7. hot water tank; 71. second water inlet pipe; 72. second water outlet pipe; 73. second return pipe. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The following describes a heat recovery unit, a control method and a control device of a heat recovery unit provided by the present invention with reference to the accompanying drawings. It should be noted that the control method of the heat recovery unit protected by the second aspect of the present invention and the control device of the heat recovery unit protected by the third aspect of the present invention are structurally based on the heat recovery unit protected by the first aspect of the present invention.

[0057] like Figure 1 and 2 As shown, the heat recovery unit according to the first embodiment of the present invention includes a compressor 1, a condenser 2, an evaporator 3, an electronic expansion valve 4, a cooling tower 6 and a hot water tank 7.

[0058] The compressor 1, the condenser 2, the evaporator 3 and the electronic expansion valve 4 are interconnected through a refrigerant pipeline, wherein, in the heating mode of the heat recovery unit, the condenser 2 generates high-temperature cooling water to meet the heating requirements; and in the cooling mode of the heat recovery unit, the evaporator 3 generates low-temperature chilled water to meet the cooling requirements.

[0059] The condenser 2 is connected to a cooling water outlet pipe 21 and a cooling water inlet pipe 22 . The cooling water outlet pipe 21 is connected to a first inlet pipe 61 of a cooling tower 6 and a second inlet pipe 71 of a hot water tank 7 through a first three-way valve 51 .

[0060] The cooling tower 6 is further provided with a first water outlet pipe 62 and a first return pipe 63 . The first water outlet pipe 62 is connected to the first return pipe 63 and the cooling water inlet pipe 22 respectively through the second three-way valve 52 .

[0061] The hot water tank 7 is further provided with a second water outlet pipe 72 and a second return pipe 73 . The second water outlet pipe 72 is connected to the second return pipe 73 and the cooling water inlet pipe 22 respectively through the third three-way valve 53 .

[0062] The heat recovery unit is suitable for switching between different working modes by controlling the opening degrees of the first three-way valve 51 , the second three-way valve 52 and the third three-way valve 53 .

[0063] According to the heat recovery unit of the embodiment of the present invention, its specific working principle and working process are as follows: the heat recovery unit has a cooling mode and a heating mode, and the heat recovery unit includes a full heat recovery mode, a partial heat recovery mode and a full cooling mode in the cooling mode, and includes a full heat recovery mode, a partial heat recovery mode and a full heating mode in the heating mode.

[0064] In the refrigeration mode, the evaporator 3 generates low-temperature chilled water to meet the refrigeration requirements, and the condenser 2 generates high-temperature condensed water. At this time, the cooling tower 6 cools the high-temperature cooling water flowing out of the condenser 2. For example, in the full heat recovery mode of the refrigeration mode, the valve port of the first three-way valve 51 flowing to the first water outlet pipe 62 is closed and the valve port flowing to the second water outlet pipe 72 is fully opened. At this time, the high-temperature cooling water flowing out of the condenser 2 all flows into the hot water tank 7 through the second water outlet pipe 72 to achieve heat recovery of the cooling water (that is, to achieve heat recovery of the condenser 2), and at this time, the high-temperature cooling water does not flow through the cooling tower 6 but is all used for heat recovery. For another example, in the partial heat recovery mode of the refrigeration mode, the valve openings of the first three-way valve 51 flowing to the first water outlet pipe 62 are distributed and opened, and the valve openings flowing to the second water outlet pipe 72 are partially opened. At this time, a part of the high-temperature cooling water flowing out of the condenser 2 flows into the cooling tower 6 through the first water outlet pipe 62 for cooling, and another part of the high-temperature cooling water flows into the hot water tank 7 through the second water outlet pipe 72 for heat recovery. At this time, a part of the heat of the condenser 2 is cooled and the other part is heat recovered. For another example, in the full cooling mode of the refrigeration mode, the valve openings of the first three-way valve 51 flowing to the first water outlet pipe 62 are all opened and the valve openings flowing to the second water outlet pipe 72 are closed. At this time, the high-temperature cooling water flowing out of the condenser 2 all flows into the cooling tower 6 through the first water outlet pipe 62 to achieve cooling of the cooling water, and at this time, the high-temperature cooling water does not flow through the hot water tank 7 and is not heat recovered.

[0065] In the cooling mode, the evaporator 3 produces low-temperature chilled water, and the condenser 2 produces high-temperature condensed water to meet the heating demand. At this time, the cooling tower 6 receives the high-temperature cooling water flowing out of the condenser 2 to meet the user's heating demand, that is, the cooling tower 6 is currently the user side. For example, in the full heat recovery mode of the heating mode, the valve port of the first three-way valve 51 flowing to the first water outlet pipe 62 is closed and the valve port flowing to the second water outlet pipe 72 is fully opened. At this time, the high-temperature cooling water flowing out of the condenser 2 all flows into the hot water tank 7 through the second water outlet pipe 72 to achieve heat recovery of the cooling water (that is, to achieve heat recovery of the condenser 2), and at this time, the high-temperature cooling water does not flow through the user side but is all used for heat recovery. For another example, in the partial heat recovery mode of the heating mode, the valve openings of the first three-way valve 51 flowing to the first water outlet pipe 62 are distributed and opened, and the valve openings flowing to the second water outlet pipe 72 are partially opened. At this time, a part of the high-temperature cooling water flowing out of the condenser 2 flows into the user side through the first water outlet pipe 62 to meet the user's heating needs, and another part of the high-temperature cooling water flows into the hot water tank 7 through the second water outlet pipe 72 for heat recovery. At this time, a part of the heat of the condenser 2 is used for heating and the other part is heat recovered. For another example, in the full heating mode of the heating mode, the valve openings of the first three-way valve 51 flowing to the first water outlet pipe 62 are all opened and the valve openings flowing to the second water outlet pipe 72 are closed. At this time, all the high-temperature cooling water flowing out of the condenser 2 flows into the user side through the first water outlet pipe 62 to meet the user's heating needs, and at this time, the high-temperature cooling water does not flow through the hot water tank 7 and is not heat recovered.

[0066] In the related art, the heat recovery unit usually requires two independent condenser structures, which are complex in structure and high in cost. In addition, the procedures of the heat recovery unit in different application modes are cumbersome, and its control logic is also relatively complex, making it inconvenient to use.

[0067] Therefore, in order to solve the technical problems existing in the above-mentioned related technologies, the present invention provides a heat recovery unit, which can simultaneously realize the heat recovery function and cooling / heating function of the unit on the basis of a condenser 2 by setting multiple three-way valves and combining the improvement of the pipeline structure, thereby simplifying the overall structure of the unit, reducing the manufacturing cost, and its control logic is also simpler and easier to implement, which can ensure accurate control of the heat recovery unit in different application modes.

[0068] like Figure 1 and 2As shown, according to some embodiments of the present invention, the connection of the first three-way valve 51 is as follows: port a is connected to the cooling water inlet pipe 22, port b is connected to the first inlet pipe 61, and port c is connected to the second inlet pipe 71; the connection of the second three-way valve 52 is as follows: port a is connected to the first outlet pipe 62, port b is connected to the cooling water inlet pipe 22, and port c is connected to the first return pipe 63; the connection of the third three-way valve 53 is as follows: port a is connected to the second outlet pipe 72, port b is connected to the cooling water inlet pipe 22, and port c is connected to the second return pipe 73.

[0069] Among them, when the opening degrees of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all 0%, the water flow direction is from port a to port b; when the opening degrees of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all 100%, the water flow direction is from port a to port c; when the opening degrees of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all between 0% and 100%, the water flow direction is partially from port a to port c and partially to port b.

[0070] It should be pointed out that in order to ensure flow balance, the flow of the first three-way valve 51 from port a to port c needs to be equal to the flow of the third three-way valve 53 from port a to port b, and the sum of the flows of the second three-way valve 52 and the third three-way valve 53 needs to be no less than the minimum flow protection value of cooling water.

[0071] like Figure 1 and 2 As shown, according to some embodiments of the present invention, the heat recovery unit includes a full heat recovery mode, a partial heat recovery mode and a full cooling mode in the refrigeration mode.

[0072] Among them, in the full heat recovery mode, the opening of the first three-way valve 51 is 100% and the opening of the third three-way valve 53 is 0%; in the partial heat recovery mode, the openings of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all between 0% and 100%; in the full cooling mode, the opening of the first three-way valve 51 is 0% and the opening of the second three-way valve 52 is 0%.

[0073] It can be understood that in the full heat recovery mode of the refrigeration mode, the first three-way valve 51 is fully opened between port a and port c and is closed between port a and port b. At this time, all cooling water flows through the second water inlet pipe 71 through the hot water tank 7 for heat recovery. After flowing out of the hot water tank 7, since the third three-way valve 53 is fully opened between port a and port b and is closed between port a and port c, all the water after heat recovery flows through the second water outlet pipe 72 to the cooling water inlet pipe 22, and finally flows back to the condenser 2 to participate in the next cycle.

[0074] In the partial heat recovery mode of the refrigeration mode, the first three-way valve 51 is partially opened between port a and port b and partially opened between port a and port c. At this time, a part of the cooling water flows through the cooling tower 6 through the first water inlet pipe 61 for cooling, and the other part of the cooling water flows through the hot water tank 7 through the second water inlet pipe 71 for heat recovery. After flowing out of the cooling tower 6 and the hot water tank 7, the cooling water flows out from the first water outlet pipe 62 and the second water outlet pipe 72 and mixes in the cooling water inlet pipe 22 and enters the condenser 2 to participate in the next cycle. Among them, since the second three-way valve 52 and the third three-way valve 53 are both partially opened from port a to port b and partially opened from port a to port c, the partially cooled water flow will flow back to the cooling tower 6 again through the first return pipe 63 for secondary cooling, thereby ensuring the cooling effect of the cooling tower 6, and the water flow after partial heat recovery will flow back to the hot water tank 7 again through the second return pipe 73 for secondary heat recovery, thereby ensuring the heat recovery effect of the hot water tank 7.

[0075] In all cooling modes of the refrigeration mode, the first three-way valve 51 is closed between port a and port c and is completely open between port a and port b. At this time, all cooling water flows through the first water inlet pipe 61 through the cooling tower 6 for cooling. After flowing out of the cooling tower 6, since the second three-way valve 52 is completely open from port a to port b and is closed from port a to port c, all cooled water flows through the first water outlet pipe 62 to the cooling water inlet pipe 22, and finally flows back to the condenser 2 to participate in the next cycle.

[0076] like Figure 1 and 2 As shown, according to some other embodiments of the present invention, the heat recovery unit in the heating mode also includes a full heat recovery mode, a partial heat recovery mode and a full heating mode.

[0077] Among them, in the full heat recovery mode, the opening of the first three-way valve 51 is 100% and the opening of the third three-way valve 53 is 0%; in the partial heat recovery mode, the openings of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all between 0% and 100%; in the full heating mode, the opening of the first three-way valve 51 is 0% and the opening of the second three-way valve 52 is 0%.

[0078] It can be understood that in the full heat recovery mode of the heating mode, the first three-way valve 51 is fully opened between port a and port c and is closed between port a and port b. At this time, all cooling water flows through the second water inlet pipe 71 through the hot water tank 7 for heat recovery. After flowing out of the hot water tank 7, since the third three-way valve 53 is fully opened between port a and port b and is closed between port a and port c, all the water after heat recovery flows through the second water outlet pipe 72 to the cooling water inlet pipe 22, and finally flows back to the condenser 2 to participate in the next cycle.

[0079] In the partial heat recovery mode of the heating mode, the cooling tower 6 is used as the user side, and the user side is used to store high-temperature cooling water and to meet the user's heating needs. The first three-way valve 51 is partially opened between port a and port b and partially opened between port a and port c. At this time, a part of the cooling water flows through the use side (i.e., cooling tower 6) through the first water inlet pipe 61 to supply the user's heat demand, and the other part of the cooling water flows through the hot water tank 7 through the second water inlet pipe 71 for heat recovery. After flowing out of the use side and the hot water tank 7, the cooling water flows out from the first water outlet pipe 62 and the second water outlet pipe 72 and mixes in the cooling water inlet pipe 22 to enter the condenser 2 to participate in the next cycle. Among them, since the second three-way valve 52 and the third three-way valve 53 are both partially opened from port a to port b and partially opened from port a to port c, part of the water flow in the first water outlet pipe 62 will flow back to the use side through the first return pipe 63 for secondary use, thereby ensuring full utilization of the heat of the water flow in the use side, and the water flow after partial heat recovery will flow back to the hot water tank 7 through the second return pipe 73 for secondary heat recovery, thereby ensuring the heat recovery effect of the hot water tank 7.

[0080] In all heating modes of the heating mode, the cooling tower 6 is used as the user side, and the user side is used to store high-temperature cooling water and to meet the user's heating needs. At this time, the first three-way valve 51 is closed between port a and port c and is fully opened between port a and port b. At this time, all cooling water flows through the first water inlet pipe 61 through the user side (i.e., the cooling tower 6) to supply the user's heat demand. After flowing out of the user side, since the second three-way valve 52 is fully opened from port a to port b and is closed from port a to port c, all water flows out through the first water outlet pipe 62 to the cooling water inlet pipe 22, and finally flows back to the condenser 2 to participate in the next cycle.

[0081] The control method and control device of the heat recovery unit proposed in the present invention are described below with reference to the accompanying drawings. Among them, before the embodiment of the present invention is described in detail, the entire application scenario is first described. The control method, control device, electronic device and computer-readable storage medium of the heat recovery unit of the embodiment of the present invention can be applied to the heat recovery unit locally, and can also be applied to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, third-party devices may include various types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0082] The following is only an example of a control method applicable to a heat recovery unit. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and third-party equipment.

[0083] like Figure 3As shown, a control method for a heat recovery unit according to an embodiment of the second aspect of the present invention includes:

[0084] Step S1, obtaining the actual hot water temperature in the hot water tank 7;

[0085] Step S2, according to the actual hot water temperature, adjusting the opening of at least one of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53, so that the heat recovery unit switches between different working modes.

[0086] According to the control method of the heat recovery unit in an embodiment of the present invention, the controller first obtains the actual hot water temperature in the hot water tank 7, and determines whether the hot water tank 7 meets the preset requirements based on the actual hot water temperature, wherein the actual hot water temperature represents the actual heat recovered by heat recovery, and the preset requirements (such as the first target temperature and the second target temperature below) represent the target heat that needs to be recovered by heat recovery.

[0087] According to the actual hot water temperature, that is, the degree of heat recovery, the opening of at least one of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 is controlled and adjusted so that the heat recovery unit can switch between different working modes, thereby ensuring that the heat recovery unit can take into account both the heat recovery function and the cooling / heating function.

[0088] According to the control method of the heat recovery unit in the embodiment of the present invention, the actual hot water temperature in the hot water tank 7 is obtained, and the unit is controlled to switch between different working modes by adjusting the three-way valve. The control logic is simple and easy to implement, and can take into account the heat recovery function and the cooling / heating function at the same time, that is, it can simultaneously meet the heat recovery heat demand and the cooling / heating demand in the cooling / heating mode.

[0089] The control logic of the heat recovery unit in cooling mode is first described below.

[0090] According to some embodiments of the present invention, the step of adjusting the opening of at least one of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 according to the actual hot water temperature to control the heat recovery unit to switch between different working modes specifically includes:

[0091] Determine the cooling mode of the heat recovery unit;

[0092] According to the range of the actual hot water temperature, the opening of at least one of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 is adjusted to control the heat recovery unit to switch between the full heat recovery mode, the partial heat recovery mode and the full cooling mode.

[0093] Further, according to the range of the actual hot water temperature, the opening of at least one of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 is adjusted to control the heat recovery unit to switch between the full heat recovery mode, the partial heat recovery mode and the full cooling mode, specifically including:

[0094] According to the actual hot water temperature being lower than the first target temperature, the opening of the first three-way valve 51 is controlled to be 100% and the opening of the third three-way valve 53 is controlled to be 0%, so as to control the heat recovery unit to enter the full heat recovery mode;

[0095] According to the actual hot water temperature being greater than or equal to the first target temperature and less than the second target temperature, the openings of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are controlled to be between 0% and 100%, so as to control the heat recovery unit to enter the partial heat recovery mode;

[0096] According to the actual hot water temperature being greater than or equal to the second target temperature, the opening of the first three-way valve 51 is controlled to be 0% and the opening of the second three-way valve 52 is controlled to be 0%, so as to control the heat recovery unit to enter the full cooling mode.

[0097] It can be understood that when the actual hot water temperature is lower than the first target temperature, it proves that the heat in the current hot water tank 7 cannot meet the target requirements of the heat recovery process. Therefore, it is necessary to control all high-temperature cooling water to flow through the hot water tank 7 to perform the entire heat recovery process. At this time, the opening of the first three-way valve 51 is 100% and the opening of the third three-way valve 53 is 0%.

[0098] When the actual hot water temperature is greater than or equal to the first target temperature and less than the second target temperature, it proves that the heat in the current hot water tank 7 can meet the target requirements of the heat recovery process. At this time, in order to take into account the cooling effect of the air conditioner, it is necessary to control part of the high-temperature cooling water to pass through the cooling tower 6 for cooling, so as to ensure the heat exchange efficiency of the condenser 2, and then ensure the cooling effect of the evaporator 3. It can be understood that the current unit is in partial heat recovery mode, and the opening degrees of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all between 0% and 100%.

[0099] When the actual hot water temperature is greater than or equal to the second target temperature, it proves that the heat in the current hot water tank 7 far exceeds the target requirement of the heat recovery process. At this time, due to excessive heat recovery, there is no need to continue the heat recovery process. Therefore, it is necessary to control all high-temperature cooling water to flow through the cooling tower 6 to carry out the entire cooling process, thereby improving the refrigeration efficiency of the unit. At this time, the opening of the first three-way valve 51 is 0% and the opening of the second three-way valve 52 is 0%.

[0100] According to some embodiments of the present invention, in the partial heat recovery mode, the method further comprises:

[0101] Obtain the actual cooling temperature and the target cooling temperature of the cooling water outlet pipe 21;

[0102] According to the comparison result between the actual cooling temperature and the target cooling temperature, adjust the opening degree of the first three-way valve 51 until the actual cooling temperature reaches the target cooling temperature.

[0103] It can be understood that when the difference between the actual cooling temperature and the target cooling temperature is larger, the proportion of the cooling water that needs to be cooled by the cooling tower 6 should increase, that is, the opening degree of the first three-way valve 51 should decrease at this time. That is, the difference between the actual cooling temperature and the target cooling temperature is negatively correlated with the opening degree of the first three-way valve 51.

[0104] First, the control logic of the heat recovery unit in the heating mode will be described below.

[0105] According to some embodiments of the present invention, the steps of adjusting the opening degree of at least one of the first three-way valve 51, the second three-way valve 52, and the third three-way valve 53 according to the actual hot water temperature to control the switching of the heat recovery unit between different working modes specifically include:

[0106] Determine that the heat recovery unit operates in the heating mode;

[0107] According to the range of the actual hot water temperature, adjust the opening degree of at least one of the first three-way valve 51, the second three-way valve 52, and the third three-way valve 53 to control the switching of the heat recovery unit between the full heat recovery mode, the partial heat recovery mode, and the full heating mode.

[0108] Further, the steps of adjusting the opening degree of at least one of the first three-way valve 51, the second three-way valve 52, and the third three-way valve 53 according to the range of the actual hot water temperature to control the switching of the heat recovery unit between the full heat recovery mode, the partial heat recovery mode, and the full heating mode specifically include:

[0109] According to the actual hot water temperature being lower than the first target temperature, control the opening degree of the first three-way valve 51 to be 100% and the opening degree of the third three-way valve 53 to be 0% to control the heat recovery unit to enter the full heat recovery mode;

[0110] According to the actual hot water temperature being greater than or equal to the first target temperature and less than the second target temperature, then control the opening degrees of the first three-way valve 51, the second three-way valve 52, and the third three-way valve 53 to be all between 0% and 100% to control the heat recovery unit to enter the partial heat recovery mode;

[0111] According to the actual hot water temperature being greater than or equal to the second target temperature, control the opening degree of the first three-way valve 51 to be 0% and the opening degree of the second three-way valve 52 to be 0% to control the heat recovery unit to enter the full heating mode.

[0112] It can be understood that when the actual hot water temperature is lower than the first target temperature, it proves that the heat in the current hot water tank 7 cannot meet the target requirements of the heat recovery process. Therefore, it is necessary to control all high-temperature cooling water to flow through the hot water tank 7 to perform the entire heat recovery process. At this time, the opening of the first three-way valve 51 is 100% and the opening of the third three-way valve 53 is 0%.

[0113] When the actual hot water temperature is greater than or equal to the first target temperature and less than the second target temperature, it proves that the heat in the current hot water tank 7 can meet the target requirements of the heat recovery process. At this time, in order to take into account the heating effect of the air conditioner, it is necessary to control part of the high-temperature cooling water to pass through the use side (that is, the cooling tower 6) to supply the user's heating needs. It can be understood that the current unit is in partial heat recovery mode, and the opening degrees of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 are all between 0% and 100%.

[0114] When the actual hot water temperature is greater than or equal to the second target temperature, it proves that the heat in the current hot water tank 7 far exceeds the target requirement of the heat recovery process. At this time, due to excessive heat recovery, there is no need to continue the heat recovery process. Therefore, it is necessary to control all high-temperature cooling water to flow through the use side (that is, the cooling tower 6) to carry out the entire heating process, thereby improving the heating efficiency of the unit. At this time, the opening of the first three-way valve 51 is 0% and the opening of the second three-way valve 52 is 0%.

[0115] According to some embodiments of the present invention, in all heating modes, the method further includes:

[0116] Obtaining the actual heating temperature and target heating temperature of the cooling tower 6;

[0117] According to the comparison result between the actual heating temperature and the target heating temperature, the opening degree of the first three-way valve 51 is adjusted until the actual heating temperature reaches the target heating temperature.

[0118] It can be understood that when the difference between the actual heating temperature and the target heating temperature is larger, the proportion of high-temperature cooling water that needs to flow into the user side should increase, that is, the opening of the first three-way valve 51 should be reduced at this time. That is, the difference between the actual heating temperature and the target heating temperature is negatively correlated with the opening of the first three-way valve 51.

[0119] According to some embodiments of the present invention, in the process of controlling the heat recovery unit to switch between different working modes, in the switching interval between any two working modes, the opening degree of the first three-way valve 51 is maintained at 50%.

[0120] In this way, since the valves on the water inlet side maintain a certain opening when the mode is switched, the water temperature after dilution can change slightly, avoiding the impact of rapid changes in water temperature on system stability and ensuring stable operation of the unit.

[0121] The control device of the heat recovery unit provided by the present invention is described below. The control device of the heat recovery unit described below and the control method of the heat recovery unit described above can be referred to each other.

[0122] like Figure 4 As shown, according to the third aspect of the present invention, a control device for a heat recovery unit based on the first aspect of the present invention comprises:

[0123] The acquisition module 110 is used to acquire the actual hot water temperature in the hot water tank 7;

[0124] The control module 120 is used to adjust the opening of at least one of the first three-way valve 51, the second three-way valve 52 and the third three-way valve 53 according to the actual hot water temperature, so as to control the heat recovery unit to switch between different working modes.

[0125] Figure 5 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 5 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the heat recovery unit.

[0126] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0127] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program 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 control method of the heat recovery unit provided by the above methods.

[0128] On the other hand, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the control method of the heat recovery unit provided by the above methods.

[0129] The device embodiments described above are merely illustrative, wherein 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, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0130] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method 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 this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat recovery unit, It is characterized in that include: A compressor, a condenser, an evaporator and an electronic expansion valve interconnected by refrigerant pipes; The condenser is connected to a cooling water outlet pipe and a cooling water inlet pipe, and the cooling water outlet pipe is connected to a first water inlet pipe of a cooling tower and a second water inlet pipe of a hot water tank respectively through a first three-way valve; The cooling tower is also provided with a first water outlet pipe and a first return pipe, wherein the first water outlet pipe is connected to the first return pipe and the cooling water inlet pipe respectively through a second three-way valve; The hot water tank is also provided with a second water outlet pipe and a second return pipe, and the second water outlet pipe is respectively connected with the second return pipe and the cooling water inlet pipe through a third three-way valve; The heat recovery unit is suitable for switching between different working modes by controlling the opening degrees of the first three-way valve, the second three-way valve and the third three-way valve.

2. The heat recovery unit according to claim 1, It is characterized in that The first three-way valve is connected as follows: port a is connected to the cooling water inlet pipe, port b is connected to the first inlet pipe, and port c is connected to the second inlet pipe; the second three-way valve is connected as follows: port a is connected to the first outlet pipe, port b is connected to the cooling water inlet pipe, and port c is connected to the first return pipe; the third three-way valve is connected as follows: port a is connected to the second outlet pipe, port b is connected to the cooling water inlet pipe, and port c is connected to the second return pipe; Among them, when the openings of the first three-way valve, the second three-way valve and the third three-way valve are all 0%, the water flow direction is from port a to port b; when the openings of the first three-way valve, the second three-way valve and the third three-way valve are all 100%, the water flow direction is from port a to port c; when the openings of the first three-way valve, the second three-way valve and the third three-way valve are all between 0% and 100%, the water flow direction is partially from port a to port c and partially to port b.

3. The heat recovery unit according to claim 2, It is characterized in that The heat recovery unit includes a full heat recovery mode, a partial heat recovery mode and a full cooling mode in the refrigeration mode; Among them, in the full heat recovery mode, the opening of the first three-way valve is 100% and the opening of the third three-way valve is 0%; in the partial heat recovery mode, the openings of the first three-way valve, the second three-way valve and the third three-way valve are all between 0% and 100%; in the full cooling mode, the opening of the first three-way valve is 0% and the opening of the second three-way valve is 0%.

4. The heat recovery unit according to claim 2, It is characterized in that The heat recovery unit also includes a full heat recovery mode, a partial heat recovery mode and a full heating mode in the heating mode; Among them, in the full heat recovery mode, the opening of the first three-way valve is 100% and the opening of the third three-way valve is 0%; in the partial heat recovery mode, the openings of the first three-way valve, the second three-way valve and the third three-way valve are all between 0% and 100%; in the full heating mode, the opening of the first three-way valve is 0% and the opening of the second three-way valve is 0%.

5. A control method for a heat recovery unit according to any one of claims 1 to 4, It is characterized in that include: Get the actual hot water temperature in the hot water tank; According to the actual hot water temperature, the opening degree of at least one of the first three-way valve, the second three-way valve and the third three-way valve is adjusted so that the heat recovery unit switches between different working modes.

6. The control method of the heat recovery unit according to claim 5, It is characterized in that The step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the actual hot water temperature to control the heat recovery unit to switch between different working modes specifically includes: Determining a refrigeration mode in which the heat recovery unit operates; According to the interval range of the actual hot water temperature, the opening degree of at least one of the first three-way valve, the second three-way valve and the third three-way valve is adjusted to control the heat recovery unit to switch between full heat recovery mode, partial heat recovery mode and full cooling mode.

7. The control method of the heat recovery unit according to claim 6, It is characterized in that The step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the interval range of the actual hot water temperature to control the heat recovery unit to switch between the full heat recovery mode, the partial heat recovery mode and the full cooling mode specifically includes: According to the actual hot water temperature being lower than the first target temperature, controlling the opening of the first three-way valve to be 100% and the opening of the third three-way valve to be 0%, so as to control the heat recovery unit to enter the full heat recovery mode; According to the actual hot water temperature being greater than or equal to the first target temperature and less than the second target temperature, the openings of the first three-way valve, the second three-way valve and the third three-way valve are controlled to be between 0% and 100%, so as to control the heat recovery unit to enter the partial heat recovery mode; According to the actual hot water temperature being greater than or equal to the second target temperature, the opening of the first three-way valve is controlled to be 0% and the opening of the second three-way valve is controlled to be 0%, so as to control the heat recovery unit to enter the full cooling mode.

8. The control method of the heat recovery unit according to claim 6, It is characterized in that In the partial heat recovery mode, it also includes: Obtaining the actual cooling temperature and target cooling temperature of the cooling water outlet pipe; According to the comparison result between the actual cooling temperature and the target cooling temperature, the opening of the first three-way valve is adjusted until the actual cooling temperature reaches the target cooling temperature.

9. The control method of the heat recovery unit according to claim 5, It is characterized in that The step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the actual hot water temperature to control the heat recovery unit to switch between different working modes specifically includes: Determining a heating mode in which the heat recovery unit operates; According to the interval range of the actual hot water temperature, the opening degree of at least one of the first three-way valve, the second three-way valve and the third three-way valve is adjusted to control the heat recovery unit to switch between full heat recovery mode, partial heat recovery mode and full heating mode.

10. The control method of the heat recovery unit according to claim 9, It is characterized in that The step of adjusting the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the interval range of the actual hot water temperature to control the heat recovery unit to switch between the full heat recovery mode, the partial heat recovery mode and the full heating mode specifically includes: According to the actual hot water temperature being lower than the first target temperature, controlling the opening of the first three-way valve to be 100% and the opening of the third three-way valve to be 0%, so as to control the heat recovery unit to enter the full heat recovery mode; According to the actual hot water temperature being greater than or equal to the first target temperature and less than the second target temperature, the openings of the first three-way valve, the second three-way valve and the third three-way valve are controlled to be between 0% and 100%, so as to control the heat recovery unit to enter the partial heat recovery mode; According to the actual hot water temperature being greater than or equal to the second target temperature, the opening of the first three-way valve is controlled to be 0% and the opening of the second three-way valve is controlled to be 0%, so as to control the heat recovery unit to enter the full heating mode.

11. The control method of the heat recovery unit according to claim 10, It is characterized in that In the all heating modes, the method further includes: Obtaining an actual heating temperature and a target heating temperature of the cooling tower; According to a comparison result between the actual heating temperature and the target heating temperature, the opening of the first three-way valve is adjusted until the actual heating temperature reaches the target heating temperature.

12. The control method of the heat recovery unit according to any one of claims 5 to 11, It is characterized in that In the process of controlling the heat recovery unit to switch between different working modes, within a switching interval between any two working modes, the opening degree of the first three-way valve is maintained at 50%.

13. A control device for a heat recovery unit according to any one of claims 1 to 4, It is characterized in that include: An acquisition module is used to obtain the actual hot water temperature in the hot water tank; The control module is used to adjust the opening of at least one of the first three-way valve, the second three-way valve and the third three-way valve according to the actual hot water temperature, so as to control the heat recovery unit to switch between different working modes.

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