Steam generation equipment and control method thereof, controller, steam generation system and storage medium

Abstract

The invention provides steam generation equipment, a control method of the steam generation equipment, a controller, a steam generation system and a storage medium. The steam generation equipment comprises a heat pump system, the heat pump system comprises a compressor, a steam generator, a throttling element and an evaporator, the compressor, the steam generator, the throttling element and the evaporator are sequentially connected to form a refrigerant circulation loop for circulating flowing of a refrigerant, the steam generator heats water into steam through the refrigerant, and the steam generator is provided with a water supplementing opening; the water replenishing system comprises a water tank, a water replenishing pump and a water replenishing pipeline, the water replenishing pipeline is connected with the water tank and the water replenishing port and is thermally coupled with at least one to-be-cooled object of the heat pump system, and the water replenishing pump is arranged on the water replenishing pipeline to drive water in the water tank to directly or indirectly cool the at least one to-be-cooled object; and the water cooling the at least one to-be-cooled object is driven to flow to the water replenishing port to replenish water to the steam generator. Therefore, the energy efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of steam preparation, and in particular to a steam generating device and a control method thereof, a controller, a steam generating system and a storage medium. Background Art

[0002] With the rapid development of industrial technology, the demand for steam is increasing. Steam generating equipment is a kind of equipment that generates steam to meet the demand for steam.

[0003] However, the energy efficiency of steam generating equipment needs to be improved. Summary of the invention

[0004] A technical problem to be solved by the present application is to improve the energy efficiency of steam generating equipment.

[0005] In order to solve the above technical problems, the present application provides a steam generating device, which comprises:

[0006] A heat pump system, comprising a compressor, a steam generator, a throttling device and an evaporator, wherein the compressor, the steam generator, the throttling device and the evaporator are sequentially connected to form a refrigerant circulation loop for circulating refrigerant, the steam generator utilizes the refrigerant to heat water into steam, and the steam generator has a water supply port; and

[0007] The water supply system includes a water tank, a water supply pump and a water supply pipeline. The water supply pipeline connects the water tank and the water supply port and is thermally coupled to at least one object to be cooled in the heat pump system. The water supply pump is arranged on the water supply pipeline to drive the water in the water tank to directly or indirectly cool the at least one object to be cooled, and drives the water after cooling the at least one object to be cooled to flow to the water supply port to supply water to the steam generator.

[0008] In some embodiments, at least one object to be cooled includes a motor of a compressor, and the refrigerant outlet of the steam generator is thermally coupled to the motor through a cooling pipeline so that the motor can be cooled by the refrigerant flowing out of the steam generator. The water supply pipeline includes a first water supply pipeline, which connects a water tank and a water supply port. A first heat exchanger is provided on the first water supply pipeline, and the first heat exchanger is connected to the cooling pipeline, so that the water in the water tank flows through the first heat exchanger in the process of flowing to the water supply port, and the refrigerant flowing from the refrigerant outlet to the motor is cooled at the first heat exchanger.

[0009] In some embodiments, the water replenishment pipeline also includes a first water return pipeline, which is connected to the water tank and to the portion of the first water supply pipeline located between the first heat exchanger and the water replenishment port to guide the water flowing out of the first heat exchanger back to the water tank.

[0010] In some embodiments, the water replenishment system further includes a first valve, which is disposed at the connection between the first water return pipeline and the first water supply pipeline to control the flow from the first heat exchanger to the water replenishment port and the first water return pipeline.

[0011] In some embodiments, the heat pump system includes an oil tank, which is connected to the compressor through a lubrication pipeline to supply lubricating oil to the compressor to lubricate the compressor. At least one object to be cooled includes lubricating oil. The water supply pipeline includes a second water supply pipeline, which is connected to the water tank. A second heat exchanger is provided on the second water supply pipeline, and the second heat exchanger is connected to the lubrication pipeline so that the water in the second water supply pipeline flowing from the water tank can cool the lubricating oil flowing to the compressor.

[0012] In some embodiments, the second water supply pipeline is connected to a portion of the first water supply pipeline of the water supply pipeline located between the first heat exchanger and the water tank.

[0013] In some embodiments, the water replenishment system further includes a second valve, which is disposed at a connection between the first water supply pipeline and the second water supply pipeline and controls a flow rate from the water tank to the first heat exchanger and the second heat exchanger.

[0014] In some embodiments, the water replenishment pipeline further includes a second water return pipeline, which connects the second heat exchanger and the water tank to guide the water after cooling the lubricating oil back to the water tank.

[0015] In some embodiments, the steam generator includes a shell and a heat exchange tube. The shell is used to hold water. The water supply port is arranged on the shell. The heat exchange tube is connected to the shell and is connected to the outlet and throttling device of the compressor so that the high-temperature gaseous refrigerant discharged by the compressor flows into the heat exchange tube and heats the water in the shell into steam.

[0016] In some embodiments, the water replenishment pump is a fixed frequency pump.

[0017] In addition, the present application also provides a control method for a steam generating device according to any embodiment, which includes:

[0018] Determine whether the steam generator needs water replenishment;

[0019] When the steam generator needs to be replenished with water, the water replenishment pipeline is connected to the water replenishment port of the steam generator, and the water replenishment system replenishes water for the steam generator.

[0020] In some embodiments, connecting the water supply line to the water supply port of the steam generator includes:

[0021] The first water supply pipeline of the water replenishment pipeline is connected to the water replenishment port so that water flows through the first heat exchanger on the first water supply pipeline during the process of flowing to the water replenishment port, and cools the refrigerant flowing from the refrigerant outlet of the steam generator to the motor of the compressor at the first heat exchanger.

[0022] In some embodiments, the control method further includes:

[0023] After the heat pump system receives a shutdown command, disconnect the make-up water pipeline from the make-up water port within P minutes.

[0024] In some embodiments, 1 ≤ P ≤ 5.

[0025] In some embodiments, the control method further includes:

[0026] Control the second valve of the make-up water system to control the flow rate of the first heat exchanger on the first water supply pipeline flowing from the water tank to the make-up water pipeline for cooling the motor of the compressor, and the flow rate of the second heat exchanger on the second water supply pipeline flowing from the water tank to the make-up water pipeline for cooling the lubricating oil used to lubricate the compressor.

[0027] In some embodiments, controlling the second valve of the make-up water system includes:

[0028] Control the opening degree of the second valve according to the oil supply temperature, where the oil supply temperature is the temperature of the lubricating oil flowing to the compressor.

[0029] In some embodiments, controlling the opening degree of the second valve according to the oil supply temperature includes:

[0030] Determine the value of D according to the oil supply temperature to determine the action amplitude |D|%;

[0031] Control the opening degree of the second valve according to the determined value of D.

[0032] In some embodiments, determining the value of D according to the oil supply temperature includes:

[0033] When the actual value of the oil supply temperature is greater than or equal to the preset temperature, D = a * ΔT1 + b * ΔT2; and / or,

[0034] When the actual value of the oil supply temperature is less than the preset temperature, D = c * ΔT1;

[0035] Wherein, ΔT1 = actual value of the oil supply temperature - set value of the oil supply temperature, ΔT2 = actual value of the make-up water temperature - set value of the make-up water temperature, a + b = 1, a ≥ b.

[0036] In some embodiments, 0.5 ≤ a < 1; and / or, 0 < b ≤ 0.5; and / or, 0.5 ≤ c ≤ 1; and / or, the preset temperature is 30 - 40 °C.

[0037] In some embodiments, controlling the opening degree of the second valve according to the determined value of D includes at least one of the following:

[0038] When D > m, increase the opening degree of the second valve by |D|%;

[0039] When D<-m, reduce the opening of the second valve by |D|%;

[0040] When -m≤D≤m, the opening of the second valve is kept unchanged;

[0041] Where m>0.

[0042] In some embodiments, 0.4≤m≤0.6.

[0043] In some embodiments, |D| % ≤ 3%.

[0044] In some embodiments, when the opening of the second valve is controlled according to the oil supply temperature, the opening of the second valve is controlled according to the oil supply temperature every preset time.

[0045] In some embodiments, the preset time is 5 to 10 seconds.

[0046] In some embodiments, when the second valve of the water replenishment system is controlled, the opening of the second valve is greater than or equal to a preset minimum opening A, and less than or equal to a preset maximum opening B, where B>A.

[0047] In some embodiments, 10%≤A<20%, and / or 10% <B≤20%。

[0048] In some embodiments, controlling the second valve of the water replenishment system includes:

[0049] Before the opening of the second valve is controlled according to the oil supply temperature, the opening of the second valve is first made to reach a preset minimum opening A and maintained for t minutes.

[0050] In some embodiments, 1≤t≤5.

[0051] In some embodiments, the control method further includes at least one of the following:

[0052] After the heat pump system receives the start-up command, the water supply pump is turned on first, and the compressor is turned on after the water supply pump is turned on for T1 minute;

[0053] After the heat pump system stops for T2 minutes, turn off the water supply pump;

[0054] When the water temperature in the water tank is higher than the water tank temperature setting value and the water level in the water tank is lower than the water level upper limit, water is added to the water tank.

[0055] In some embodiments, 1≤T1≤5; and / or, 1≤T2≤5; and / or, when the water temperature in the water tank is higher than the water tank temperature setting value and the water level in the water tank is lower than the water level upper limit, not only water is added to the water tank, but also the water tank is drained.

[0056] In some embodiments, during the process of draining the water tank, if the water temperature in the water tank is n°C lower than the water tank temperature setting value, the water tank stops draining; and / or, the control method also includes: stopping the water tank from draining after the heat pump system is shut down for T3 minutes.

[0057] In some embodiments, 2≤n≤5; and / or, 1≤T3≤5.

[0058] In addition, the present application also provides a controller, which includes a memory and a processor coupled to the memory, and the processor is configured to execute the control method of any embodiment based on instructions stored in the memory.

[0059] In addition, the present application also provides a steam generating system, characterized in that it includes the steam generating device of any embodiment and the controller of any embodiment.

[0060] In addition, the present application also provides a storage medium, which stores computer instructions, and the computer instructions are executed by a processor to implement the control method of any embodiment.

[0061] By setting up a heat pump system in the steam generating equipment to prepare steam, and constructing the water supply system of the steam generating equipment so that the supply water flows into the water supply port, the object to be cooled by the heat pump system is first cooled, so that the supply water temperature can be effectively increased, thereby effectively improving the energy efficiency of the steam generating equipment.

[0062] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0064] Figure 1 This is a working principle diagram of the steam generating equipment in the embodiment of the present application.

[0065] Description of reference numerals:

[0066] 10. Steam generating equipment;

[0067] 1. Heat pump system; 11. Compressor; 111. Outlet; 112. Inlet; 12. Steam generator; 121. Shell; 122. Refrigerant inlet; 123. Refrigerant outlet; 124. Water supply port; 125. Exhaust port; 126. Liquid level gauge; 127. Pressure regulating valve; 13. Throttle; 14. Evaporator; 15. Refrigerant circulation loop; 16. Oil tank; 17. Oil pump; 18. Cooling pipeline; 19. Lubrication pipeline;

[0068] 2. Water supply system; 20. One-way valve; 21. Water treatment device; 22. Water tank; 23. Water supply pump; 24. Water supply pipeline; 241. First water supply pipeline; 242. Second water supply pipeline; 243. First return water pipeline; 244. Second return water pipeline; 25. First heat exchanger; 26. Second heat exchanger; 27. First valve; 28. Second valve; 29. ​​Drain valve;

[0069] 3. The first temperature measuring component;

[0070] 4. The second temperature measuring component;

[0071] 5. The third temperature measuring component. DETAILED DESCRIPTION

[0072] 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, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of this application.

[0073] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0074] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0075] In the description of the present application, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0076] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0077] In the industrial field, steam is needed in processes such as wine distillation, Chinese medicine extraction, printing and dyeing bleaching, and steam sterilization. Moreover, with the development of industrial technology, the demand for high-temperature steam is increasing.

[0078] Steam generating equipment is a device used to generate steam. The steam generated by the equipment is supplied to steam consuming equipment (such as wine distillation equipment, Chinese medicine extraction equipment, printing and dyeing bleaching equipment or steam sterilization equipment) to meet the working requirements of the corresponding steam consuming equipment.

[0079] Common steam generating equipment currently includes boilers or heat pumps.

[0080] Among them, although boilers can generate steam at relatively high temperatures, they usually use fossil fuels such as coal, so there are problems of serious pollution and low energy efficiency.

[0081] As a renewable energy utilization device, heat pumps can upgrade low-grade waste heat energy in various industrial production processes into high-grade thermal energy by consuming a small amount of electricity, thereby doubling the heat and improving the quality. Under the same heating conditions, heat pump heat production can reduce electricity consumption by 30% to 85% compared to "direct electric heating", and is the most efficient way to supply heat. Therefore, heat pumps have shown great potential to replace boilers and prepare steam.

[0082] However, heat pumps themselves usually do not have the function of steam preparation. In order to achieve the function of steam preparation, heat pumps usually need to be equipped with flash tanks and circulating water supply pumps. The flash tank and the condenser of the heat pump are connected to form a circulating water circuit through a pipeline. The hot water generated by the condenser flows to the flash tank through the circulating water circuit, flashes to generate steam, and the steam is discharged. The remaining water is deposited at the bottom of the flash tank and flows back to the condenser driven by the circulating water supply pump on the circulating water circuit. In addition, the consumed steam is replenished into the flash tank by the water supply system.

[0083] For example, in the process of wine distillation, Chinese medicine extraction, printing and dyeing bleaching, steam sterilization, etc., which requires more than 2T / h of high-temperature steam at 115℃~145℃, the common steam production method of heat pump units is: recover industrial waste heat of about 65℃, and first generate 150℃ high-temperature hot water in the condenser on the refrigerant circulation loop through the heat pump unit. The 150℃ high-temperature hot water then enters the flash tank to flash out 145℃ saturated steam. After the hot water flashes the steam, its own water temperature is also reduced to 145℃ and remains at the bottom of the flash tank. The hot water at the bottom is then returned to the condenser of the heat pump unit through the circulation pump for heating, and the consumed steam is replenished into the flash tank by the water supply system.

[0084] The above heat pump steam generation method has the following problems:

[0085] (1) The feed water temperature used to compensate for the consumed steam is relatively low, so the time required to generate high-temperature steam from the corresponding feed water is relatively long, and the heat consumed is relatively high. For example, the general feed water temperature is usually around 20°C. The time and heat required to directly convert the feed water heat of around 20°C into high-temperature steam of 145°C are relatively long, so the efficiency and energy efficiency are both low;

[0086] (2) The heat pump itself only produces hot water, not steam. It needs to be equipped with a flash tank and a circulation pump, and needs to be equipped with more engineering pipelines, resulting in a complex structure and high cost.

[0087] (3) Since the heat pump unit itself does not generate steam, the heat pump unit itself does not need to replenish water. In this case, the heat pump unit itself has no cold source for replenishing water, and its object to be cooled (including but not limited to motors and lubricating oil) can only adopt conventional refrigerant cooling methods, that is, usually only refrigerant can be taken from the condenser, and the corresponding refrigerant is throttled and cooled to cool the object to be cooled. However, since the refrigerant taken out from the condenser is a high-temperature and high-pressure refrigerant, even after throttling, it can only be reduced to the evaporation temperature of the evaporator at the lowest. The evaporation temperature of the evaporator is close to the temperature of the heat source on the evaporator side. Therefore, this method of taking refrigerant from the condenser to cool the object to be cooled is affected by the temperature of the heat source on the evaporator side. When the temperature of the heat source on the evaporator side is high, the cooling effect is poor and it is difficult to meet the cooling needs of the object to be cooled.

[0088] It can be seen that the use of a heat pump in combination with a flash tank to prepare steam has problems such as low energy efficiency, complex structure, high cost, a single cooling method for the object to be cooled, and poor cooling effect.

[0089] In view of the above situation, the present application provides a steam generating device and a control method thereof, a controller, a steam generating system and a storage medium.

[0090] Figure 1 The structure and working principle of the steam generating device in the present application are exemplarily shown.

[0091] See also Figure 1 The steam generating device 10 includes a heat pump system 1 and a water supply system 2. The heat pump system 1 includes a compressor 11, a steam generator 12, a throttling device 13 and an evaporator 14. The compressor 11, the steam generator 12, the throttling device 13 and the evaporator 14 are sequentially connected to form a refrigerant circulation loop 15 for circulating refrigerant. The steam generator 12 uses the refrigerant to heat water into steam. The steam generator 12 has a water supply port 124. The water supply system 2 includes a water tank 22, a water supply pump 23 and a water supply pipeline 24. The water supply pipeline 24 connects the water tank 22 and the water supply port 124, and is thermally coupled with at least one object to be cooled of the heat pump system 1. The water supply pump 23 is arranged on the water supply pipeline 24 to drive the water in the water tank 22 to directly or indirectly cool at least one object to be cooled, and drives the water after cooling at least one object to be cooled to flow to the water supply port 124 to supply water to the steam generator 12.

[0092] In the above scheme, the steam generating device 10 uses the heat pump system 1 to prepare steam, which can effectively reduce pollution and improve energy efficiency compared with the method of preparing steam with a boiler.

[0093] Furthermore, since the make-up water used to compensate for the consumed steam does not flow directly to the make-up water port 124 of the heat pump system 1, but first cools the object to be cooled of the heat pump system 1 before flowing to the make-up water port 124 of the heat pump system 1, in the corresponding process, the make-up water can absorb the heat of the object to be cooled. Therefore, the make-up water can be preheated, and the temperature of the make-up water can be effectively increased, so that the temperature of the make-up water flowing into the make-up water port 124 is higher. In this way, the thermal energy quality of the make-up water is effectively improved, and it can better exchange heat with the refrigerant. It only takes a shorter time and consumes less heat to evaporate and generate steam of the required temperature. Therefore, the energy efficiency can be further improved.

[0094] It can be seen that by setting up a heat pump system 1 in the steam generating device 10 to prepare steam, and constructing the water replenishment system 2 of the steam generating device 10 so that the replenishment water first cools the object to be cooled of the heat pump system 1 before flowing into the water replenishment port 124, the energy efficiency of the steam generating device 10 can be effectively improved.

[0095] In addition, the water added to the steam generator 12 is preheated in advance, and the temperature is increased. From another perspective, when the same amount of heat is consumed, it is conducive to preparing higher temperature steam, which can better meet the demand of steam consuming equipment for higher temperature steam.

[0096] Moreover, the make-up water system 2 is used to cool the object to be cooled of the heat pump system 1 to achieve preheating of the make-up water. The object to be cooled of the heat pump system 1 is no longer limited to refrigerant cooling, which effectively increases the diversity of cooling methods. When the heat source temperature on the evaporator side is high and the evaporation temperature is high and cannot meet the cooling demand of the object to be cooled, make-up water cooling can be used to effectively improve the cooling effect of the object to be cooled.

[0097] In addition, in the above scheme, since the heat pump system 1 no longer relies on a flash tank to prepare steam, but instead replaces the original condenser of the heat pump unit located in the refrigerant circulation loop 15 with a steam generator 12 that can generate steam, the steam is prepared by the steam generator 12. Therefore, the heat pump system 1 has its own steam generation function and does not need to be equipped with a flash tank and a circulating water supply pump, that is, it can generate steam. Therefore, it can effectively simplify the structure and reduce costs.

[0098] It can be seen that the above scheme, by replacing the original condenser in the heat pump system 1 with the steam generator 12, and constructing the make-up water system 2 so that the make-up water first cools the object to be cooled of the heat pump system 1 before flowing into the make-up water port 124, can make the heat pump system 1 itself integrate the steam generation function, and the object to be cooled of the heat pump system 1 can be cooled by the make-up water, and the make-up water can be preheated. In this way, the structure of the steam generating device 10 can be effectively simplified, the cost of the steam generating device 10 can be reduced, the cooling effect of the object to be cooled can be improved, the steam generation time can be shortened, the heat consumed in steam generation can be reduced, and the steam temperature can be increased. Therefore, the steam generating device 10 can achieve higher energy efficiency and efficiency in steam preparation and cooling process of the object to be cooled based on a simpler structure and lower cost.

[0099] It can be understood that the objects to be cooled of the heat pump system 1 generally include but are not limited to the motor of the compressor 11 and the lubricating oil for lubricating the compressor 11. For different objects to be cooled, water supplementation cooling can be used, and when using water supplementation to cool each object to be cooled, the same or different methods can be used, for example, water supplementation uses a direct or indirect cooling method for all objects to be cooled, or water supplementation uses an indirect cooling method for a part of the objects to be cooled and a direct cooling method for another part of the objects to be cooled.

[0100] Specifically, see, for example, Figure 1In some embodiments, the at least one object to be cooled includes a motor of the compressor 11 (not shown), and the refrigerant outlet 123 of the steam generator 12 is thermally coupled to the motor through the cooling pipe 18 so as to utilize the refrigerant flowing out of the steam generator 12 to cool the motor, and the water supply pipe 24 includes a first water supply pipe 241, which connects the water tank 22 and the water supply port 124, and a first heat exchanger 25 is provided on the first water supply pipe 241. The first heat exchanger 25 is connected to the cooling pipe 18, so that the water in the water tank 22 flows through the first heat exchanger 25 in the process of flowing to the water supply port 124, and cools the refrigerant flowing from the refrigerant outlet 123 to the motor at the first heat exchanger 25.

[0101] Based on the above arrangement, the water supply pipeline 24 is thermally coupled with the motor of the compressor 11 through the first heat exchanger 25 and the cooling pipeline 18 located on the first water supply pipeline 241, so that the water flowing to the water supply port 124 can cool the motor of the compressor 11 by exchanging heat with the refrigerant flowing out of the steam generator 12 at the first heat exchanger 25 for cooling the motor of the compressor 11. In the corresponding process, since the water supply can absorb the heat of the refrigerant at the first heat exchanger 25 and reduce the temperature of the refrigerant, the temperature of the refrigerant flowing to the motor of the compressor 11 can be lower, thereby effectively improving the compressor. The cooling effect of the motor of compressor 11 is such that even if the evaporation temperature is too high to meet the cooling demand of the motor of compressor 11, the refrigerant used to cool the motor of compressor 11 can be cooled by replenishing water to effectively meet the cooling demand of the motor of compressor 11, thereby preventing the motor from malfunctioning due to overheating, improving the reliability of compressor 11, and extending the life of compressor 11; and, the replenishing water after cooling the motor of compressor 11 is preheated and its temperature is increased before flowing into the steam generator 12, so that the time for heat to be converted into steam can be shortened and the heat consumption can be reduced, thereby effectively improving the efficiency and energy efficiency of steam preparation.

[0102] At the same time, the above scheme realizes cooling of the compressor motor by exchanging heat between the make-up water and the refrigerant used to cool the compressor motor at the first heat exchanger 25. Since the make-up water does not need to directly cool the motor of the compressor 11, but indirectly cools the motor of the compressor 11 through the refrigerant, it can also prevent safety accidents caused by the make-up water entering the motor. Moreover, in this case, the flow path originally used to realize the refrigerant cooling of the compressor motor does not need to be changed. Therefore, the structural changes are relatively small, which can reduce the improvement cost.

[0103] It can be seen that by arranging a first heat exchanger 25 on the first water supply pipe 241 connecting the water tank 22 and the water replenishment port 124, and connecting the first heat exchanger 25 to the cooling pipe 18 for transporting the refrigerant to the motor of the compressor 11 to cool the motor, a safer and more efficient motor cooling and water replenishment preheating process can be achieved based on fewer structural changes, effectively improving the cooling effect of the motor of the compressor 11, and improving the efficiency and energy efficiency of steam preparation.

[0104] Further, see Figure 1 In some embodiments, the water replenishment pipeline 24 not only includes a first water supply pipeline 241, but also includes a first water return pipeline 243. The first water return pipeline 243 is connected to the water tank 22 and to the portion of the first water supply pipeline 241 located between the first heat exchanger 25 and the water replenishment port 124 to lead the water flowing out of the first heat exchanger 25 back to the water tank 22.

[0105] Based on the above arrangement, the water preheated by the motor flowing out of the first heat exchanger 25 can be diverted according to actual needs, so that when the steam generator 12 does not need to be replenished with water or the required amount of replenished water is small, the water flowing out of the first heat exchanger 25 can at least partially flow back to the water tank 22 via the first return water pipe 243. In this way, it is convenient and flexible to meet the replenishment demand of the steam generator 12 and reduce energy waste.

[0106] It can be understood that whether the steam generator 12 needs to be replenished with water and the amount of replenished water will vary according to the different steam consumption of the steam consuming equipment. The more steam the steam consuming equipment consumes, the more replenished water is required. If no steam is consumed, no replenishment is required. Therefore, on the basis of the first water supply pipeline 241, a first water return pipeline 243 is further provided to effectively meet the needs of the situation where the amount of water flowing out of the first heat exchanger 25 is more than the required replenished water amount.

[0107] Further, see Figure 1 In some embodiments, the water replenishment system 2 not only includes a first water supply pipeline 241 and a first water return pipeline 243, but also includes a first valve 27. The first valve 27 is arranged at the connection between the first water return pipeline 243 and the first water supply pipeline 241 to control the flow from the first heat exchanger 25 to the water replenishment port 124 and the first water return pipeline 243.

[0108] The first valve 27 is provided to automatically adjust the distribution of water flowing out of the first heat exchanger 25 between the two routes of flowing to the water replenishment port 124 and flowing back to the water tank 22. Therefore, it is more convenient to realize a timely and accurate flow distribution process and better meet different water replenishment needs.

[0109] In addition, as mentioned above, the object to be cooled of the heat pump system 1 may be not only the motor of the compressor 11, but also the lubricating oil for lubricating the compressor 11. The corresponding lubricating oil is generally contained in the oil tank 16, and the oil tank 16 is connected to the compressor 11 through the lubricating pipeline 19 to supply the lubricating oil to the compressor 11 to lubricate the compressor 11.

[0110] In order to realize the water cooling method for lubricating oil, see Figure 1 In some embodiments, the water replenishment pipeline 24 includes a second water supply pipeline 242, the second water supply pipeline 242 is connected to the water tank 22, a second heat exchanger 26 is provided on the second water supply pipeline 242, and the second heat exchanger 26 is connected to the lubrication pipeline 19 so that the water in the second water supply pipeline 242 flowing from the water tank 22 can cool the lubricating oil flowing to the compressor 11.

[0111] Based on the above-mentioned arrangement, the make-up water pipeline 24 is thermally coupled with the lubricating oil through the second heat exchanger 26 located on the second water supply pipeline 242 and the lubrication pipeline 19, so that the water provided by the make-up water system 2 can be cooled by exchanging heat with the lubricating oil flowing out of the oil tank 16 for cooling the compressor 11 at the second heat exchanger 26. In the corresponding process, since the make-up water can absorb the heat of the lubricating oil at the second heat exchanger 26 and reduce the temperature of the lubricating oil, the temperature of the lubricating oil flowing into the compressor 11 can be made lower, thereby achieving a better lubricating oil cooling effect and more effectively preventing the lubricating oil from overheating.

[0112] At the same time, the above scheme realizes cooling of the lubricating oil by exchanging heat between the make-up water and the lubricating oil used to cool the compressor at the second heat exchanger 26. Since the make-up water does not need to be directly introduced into the oil tank 16, it can also prevent the quality of the lubricating oil from being affected by the make-up water entering the oil tank 16. In addition, the second heat exchanger 26 is also conducive to achieving more sufficient heat exchange between the lubricating oil and water.

[0113] It can be seen that by arranging a second heat exchanger 26 on the second water supply pipe 242 connected to the water tank 22, and connecting the second heat exchanger 26 to the lubrication pipe 19 for conveying the lubricating oil to the compressor 11, a safer and more efficient lubricating oil cooling process can be achieved, and the cooling effect of the lubricating oil can be effectively improved.

[0114] In the aforementioned embodiments, the water supply pipeline 24 may include only one of the first water supply pipeline 241 and the second water supply pipeline 242 , or may include both the first water supply pipeline 241 and the second water supply pipeline 242 .

[0115] In the case where the water supply pipeline 24 includes both the first water supply pipeline 241 and the second water supply pipeline 242, see Figure 1In some embodiments, the second water supply pipeline 242 is connected to the portion of the first water supply pipeline 241 between the first heat exchanger 25 and the water tank 22. In this case, the second water supply pipeline 242 is not directly connected to the water tank 22, but is connected to the water tank 22 through the first water supply pipeline 241. In this case, it is not necessary to equip the first water supply pipeline 241 and the second water supply pipeline 242 with a water supply pump 23 respectively, but only one water supply pump 23 is required to be provided on the portion shared by the first water supply pipeline 241 and the second water supply pipeline 242. In addition, the number of valves can also be reduced, thereby simplifying the structure and reducing costs. In addition, in this case, the water flowing out of the water tank 22 can first flow into the first water supply pipeline 241, and then be diverted to the first heat exchanger 25 and the second heat exchanger 26 according to actual conditions. It is also more convenient to adjust the flow to the first heat exchanger 25 and the second heat exchanger 26, thereby conveniently and flexibly meeting the motor cooling, water supply and lubricating oil cooling requirements under different conditions.

[0116] In the case where the second water supply pipe 242 is connected to the portion of the first water supply pipe 241 located between the first heat exchanger 25 and the water tank 22, see Figure 1 In some embodiments, the water replenishment system 2 also includes a second valve 28, which is disposed at the connection between the first water supply pipeline 241 and the second water supply pipeline 242, and controls the flow from the water tank 22 to the first heat exchanger 25 and the second heat exchanger 26.

[0117] Since the second valve 28 can automatically adjust the distribution of water flowing out of the water tank 22 between the first heat exchanger 25 and the second heat exchanger 26, it is more convenient to realize timely and accurate flow distribution process and better meet different cooling needs. For example, it is convenient to adjust the opening of the second valve 28 according to the actual value of the lubricating oil temperature, increase or decrease the flow to the second heat exchanger 26, and adjust the temperature of the lubricating oil.

[0118] The water after cooling the lubricating oil can flow to the water replenishment port 124 to replenish the steam generator 12, or it can also flow back to the water tank 22, or it can also flow partly to the water replenishment port 124 and the other part back to the water tank 22. When the water replenishment pipeline 24 includes both the first water supply pipeline 241 and the second water supply pipeline 242, since the heat generated by the motor of the compressor 11 is usually high and the heat generated by the lubricating oil is low, the amount of water required for cooling the lubricating oil is small, and the temperature rise of the water by the lubricating oil is also small, generally, the water flowing through the first heat exchanger 25 to cool the motor can meet the water replenishment demand. Therefore, in this case, only the water after cooling the motor can flow into the water replenishment port 124, and the water after cooling the lubricating oil can directly flow back to the water tank 22 without flowing to the water replenishment port 124. In this way, the pipeline connected from the second heat exchanger 26 to the water replenishment port 124 can be omitted, which is conducive to simplifying the structure.

[0119] In order to allow the water after cooling the lubricating oil to flow back to the water tank 22, see Figure 1 In some embodiments, the water supply pipeline 24 includes not only the second water supply pipeline 242, but also the second water return pipeline 244. The second water return pipeline 244 connects the second heat exchanger 26 and the water tank 22 to guide the water after cooling the lubricating oil back to the water tank 22. In this way, the water after cooling the lubricating oil can flow back to the water tank 22 via the second water return pipeline 244 to reduce energy waste.

[0120] In the aforementioned embodiments, the steam generator 12 may adopt a structure in which the refrigerant passes through the shell side and the water passes through the tube side, or may adopt a structure in which the water passes through the shell side and the refrigerant passes through the tube side.

[0121] For example, see Figure 1 In some embodiments, the steam generator 12 includes a shell 121 and a heat exchange tube (not shown). The shell 121 is used to hold water. The water supply port 124 is provided on the shell 121. The heat exchange tube is connected to the shell 121 and is connected to the discharge port 111 of the compressor 11 and the throttling member 13, so that the high-temperature gaseous refrigerant discharged by the compressor 11 flows into the heat exchange tube and heats the water in the shell 121 into steam. At this time, the steam generator 12 adopts a structure in which water flows in the shell side and refrigerant flows in the tube side. In this case, the shell 121 can store steam, so that the steam generated by the steam generator 12 can be stored in the shell 121 and wait for use without setting up additional components to store steam. Therefore, the structure is simpler.

[0122] In addition, in the aforementioned embodiments, the water supply pump 23 may be a fixed frequency pump or a variable frequency pump. When the water supply pump 23 is a fixed frequency pump, the structure is simpler, the control is more convenient, and it is easy to cooperate with the first valve 27 and / or the second valve 28 to achieve a more accurate water supply cooling process.

[0123] Based on the steam generating device 10 of the aforementioned embodiments, the present application further provides a control method, which includes:

[0124] Determine whether the steam generator 12 needs water replenishment;

[0125] When the steam generator 12 needs to be replenished with water, the water replenishment pipeline 24 is connected to the water replenishment port 124 of the steam generator 12 , and the water replenishment system 2 replenishes water for the steam generator 12 .

[0126] Based on the above steps, when the steam generator 12 needs to be replenished with water, the water replenishment system 2 can be used to replenish water for the steam generator 12 to compensate for the steam consumption. Since the water replenished by the water replenishment system 2 for the steam generator 12 is preheated by at least one object to be cooled in the heat pump system 1, the temperature is higher and can be converted into steam of the required temperature more quickly and with less heat consumption, which is conducive to improving the steam preparation efficiency and energy efficiency. From another perspective, higher temperature steam can be prepared while consuming the same amount of heat, meeting the use requirements of steam consuming equipment for higher temperature steam.

[0127] Specifically, when the water supply pipeline 24 includes the aforementioned first water supply pipeline 241, connecting the water supply pipeline 24 with the water supply port 124 of the steam generator 12 may include:

[0128] The first water supply pipeline 241 of the water replenishment pipeline 24 is connected to the water replenishment port 124 so that water flows through the first heat exchanger 25 on the first water supply pipeline 241 in the process of flowing to the water replenishment port 124, and cools the refrigerant flowing from the refrigerant outlet 123 of the steam generator 12 to the motor of the compressor 11 at the first heat exchanger 25.

[0129] In this way, the make-up water can be used to cool the motor of the compressor 11, thereby preheating the make-up water while lowering the temperature of the compressor motor, so that the water supplied to the steam generator 12 has a higher temperature, effectively improving the steam preparation efficiency and energy efficiency, and increasing the temperature of the prepared steam.

[0130] In which case, when the first valve 27 is provided on the first water supply pipeline 241 , the connection and disconnection between the first water supply pipeline 241 and the water replenishment port 124 can be achieved by controlling the first valve 27 .

[0131] Additionally, in some embodiments, the control method includes:

[0132] After the heat pump system 1 receives the shutdown command, the water supply pipeline 24 is disconnected from the water supply port 124 after P minutes.

[0133] Based on the above steps, the water supply pipeline 24 is not disconnected from the water supply port 124 immediately after the heat pump system 1 receives the shutdown command, but is disconnected after a delay of P minutes. In this way, the water supply system 2 can still perform cooling and water supply work within P minutes after the heat pump system 1 is shut down, preventing the steam generator 12 from dry burning, and allowing the object to be cooled to cool quickly after the heat pump system 1 is shut down.

[0134] The value of P can be determined according to actual conditions. For example, in some embodiments, 1≤P≤5. At this time, the delay time of disconnecting the water supply pipeline 24 is relatively appropriate, which can effectively prevent the steam generator 12 from burning dry and make the object to be cooled quickly cool after the heat pump system 1 is shut down, and will not increase unnecessary energy consumption due to the long delay in working time.

[0135] As a further improvement to the above embodiments, the control method further includes:

[0136] The second valve 28 of the water replenishment system 2 is controlled to control the flow rate of the first heat exchanger 25 on the first water supply pipeline 241 from the water tank 22 to the water replenishment pipeline 24 for cooling the motor of the compressor 11, and the flow rate of the second heat exchanger 26 on the second water supply pipeline 242 from the water tank 22 to the water replenishment pipeline 24 for cooling the lubricating oil used to lubricate the compressor 11.

[0137] Controlling the second valve 28 can control the distribution of the water flowing out of the water tank 22 between the first heat exchanger 25 and the second heat exchanger 26. In this way, it is convenient to realize the timely and accurate flow distribution process and better meet different cooling needs. For example, it is convenient to adjust the opening of the second valve 28 according to the actual value of the lubricating oil temperature, increase or decrease the flow to the second heat exchanger 26, and adjust the temperature of the lubricating oil. It can be understood that "the flow from the water tank 22 to the first heat exchanger 25 on the first water supply pipeline 241 of the water supply pipeline 24 to cool the motor of the compressor 11" specifically refers to "the flow of water from the water tank 22 to the first heat exchanger 25 on the first water supply pipeline 241 of the water supply pipeline 24 to cool the refrigerant used to cool the motor of the compressor 11".

[0138] Specifically, in some embodiments, controlling the second valve 28 of the water replenishment system 2 includes:

[0139] The opening degree of the second valve 28 is controlled according to the oil supply temperature, wherein the oil supply temperature is the temperature of the lubricating oil flowing to the compressor 11 .

[0140] In the above steps, the oil supply temperature is used as the basis for adjusting the opening of the second valve, so as to match the opening of the second valve 28 with the actual oil supply temperature, thereby realizing a dynamic water replenishment cooling process that better meets actual needs.

[0141] More specifically, in some embodiments, controlling the opening of the second valve 28 according to the oil supply temperature includes:

[0142] According to the oil supply temperature, determine the D value to determine the action range |D|%;

[0143] The opening degree of the second valve 28 is controlled according to the determined D value.

[0144] In the above steps, the action amplitude |D|% is determined according to the oil supply temperature, and the opening of the second valve 28 is adjusted according to the D value of the action amplitude |D|%, which makes it easier to accurately adjust the opening of the second valve 28. This is conducive to achieving a more accurate and efficient water replenishment cooling adjustment process.

[0145] Further, in some embodiments, determining the D value according to the oil supply temperature includes:

[0146] When the actual value of the oil supply temperature is greater than or equal to the preset temperature, D=a*ΔT1+b*ΔT2; and / or,

[0147] When the actual value of the oil supply temperature is less than the preset temperature, D = c*ΔT1;

[0148] Among them, ΔT1 = actual value of oil supply temperature - set value of oil supply temperature, ΔT2 = actual value of water supply temperature - set value of water supply temperature, a+b=1, a≥b. Since the actual value of water supply temperature is usually less than the set value of water supply temperature, ΔT2 is usually less than 0.

[0149] The above steps use different formulas to calculate the D value according to the size relationship between the actual value of the oil supply temperature and the preset temperature value, which is conducive to calculating a D value that is more in line with actual needs. In the process of adjusting the opening of the second valve 28, it is possible to adjust it according to the action amplitude |D|% that is more in line with actual needs, thereby realizing an opening adjustment process that is more in line with actual needs.

[0150] Among them, the actual value of the oil supply temperature is less than the preset temperature, indicating that the temperature of the lubricating oil is low, and the opening of the second valve 28 is already very large. In this case, the viscosity of the lubricating oil is poor, the oil supply resistance increases, and the oil supply amount decreases, which is easy to trigger the oil pressure difference shutdown protection. Therefore, it is necessary to close the second valve 28 as soon as possible. In view of this feature, the calculation formula of the D value when the actual value of the oil supply temperature is less than the preset temperature is constructed as D=c*ΔT1, so that when the actual value of the oil supply temperature is less than the preset temperature, the opening adjustment range of the second valve 28 only considers the oil supply temperature, and does not take into account the water replenishment temperature. In this way, it is convenient to quickly close the second valve 28 and adjust the temperature of the lubricating oil to be greater than or equal to the preset temperature, so as to promote the release of the oil pressure difference shutdown protection as soon as possible.

[0151] When the actual value of the oil supply temperature is greater than or equal to the preset temperature, it indicates that the temperature of the lubricating oil is relatively high. In this case, it is not easy to trigger the oil pressure difference shutdown protection, and the opening adjustment process of the second valve 28 (corresponding to the cooling process of the lubricating oil) can withstand a certain range. For this characteristic, the calculation formula of D when the actual value of the oil supply temperature is greater than or equal to the preset temperature is constructed as D = a*ΔT1 + b*ΔT2, so that when the actual value of the oil supply temperature is greater than or equal to the preset temperature, the opening adjustment range of the second valve 28 not only considers the oil supply temperature but also takes into account the water replenishment temperature, realizing the correction of the D value calculated according to the oil supply temperature by the water replenishment temperature. In this way, it is convenient to effectively reduce the temperature of the lubricating oil while taking into account the increase in the water replenishment temperature, making the lubricating oil cooling, motor cooling, and water replenishment preheating effects all better.

[0152] In the above formula, a, b, and c are all coefficients, which can be specifically set according to the actual situation. As an example, 0.5 ≤ a < 1, such as 0.6, 0.7, 0.8, or 0.9; and / or, 0 < b ≤ 0.5, such as 0.1, 0.2, 0.3, or 0.4; and / or, 0.5 ≤ c ≤ 1, such as 0.6, 0.7, 0.8, or 0.9. In this way, the magnitudes of a, b, and c are relatively appropriate, which is conducive to determining a D value that better meets the actual needs and realizing a more accurate and efficient water replenishment and cooling adjustment process.

[0153] In addition, the preset temperature can also be set according to the actual situation. As an example, in some embodiments, the preset temperature is 30 - 40 °C, such as 31 °C, 32 °C, 33 °C, 35 °C, 36 °C, 37 °C, 38 °C, or 39 °C. At this time, the magnitude of the preset temperature is relatively appropriate, and it is more suitable as a sign of whether the lubricating oil temperature is too low, which is convenient for determining different D values according to whether the lubricating oil temperature is too low and regulating the opening of the second valve 28 according to different action amplitudes.

[0154] In some embodiments, controlling the opening of the second valve 28 according to the determined D value includes at least one of the following:

[0155] When D > m, increase the opening of the second valve 28 by |D|%;

[0156] When D < -m, decrease the opening of the second valve 28 by |D|%;

[0157] When -m ≤ D ≤ m, keep the opening of the second valve 28 unchanged;

[0158] Wherein, m > 0.

[0159] In the above steps, m and -m are used as the dividing line for whether the opening of the second valve 28 is increased, decreased, or kept unchanged, so that the opening of the second valve 28 can be kept unchanged within a certain range. In this way, the operating frequency of the second valve 28 can be reduced, and the second valve 28 can be prevented from moving back and forth and affecting its service life.

[0160] The value of m can be set according to actual conditions. For example, in some embodiments, 0.4≤m≤0.6, for example, 0.45, 0.5 or 0.55, so that the value of m is more appropriate and has a relatively small impact on the temperature, so it is more convenient to prevent the second valve 28 from moving back and forth without excessively affecting the temperature.

[0161] In the aforementioned embodiment of controlling the second valve 28, |D|% can be less than or equal to 3%, that is, |D|%≤3%. Based on this, when adjusting the opening of the second valve 28, the maximum opening limit is imposed on the action amplitude, so that the action amplitude |D|% does not exceed 3%. In this way, over-adjustment can be prevented. In particular, after each action, the temperature usually does not react so quickly and there is a delay. In this case, limiting the action amplitude |D|% to no more than 3% can effectively prevent over-adjustment caused by delayed temperature response. It can be understood that limiting the action amplitude |D|% to no more than 3% means that if the calculated D value makes |D|%≥3%, it is adjusted according to |D|%=3%.

[0162] In addition, in some embodiments, when the opening of the second valve 28 is controlled according to the oil supply temperature, the opening of the second valve 28 is controlled according to the oil supply temperature every preset time. In this way, the frequency of regulation can be reduced, which is not only conducive to preventing the second valve 28 from moving back and forth and affecting its service life, but also conducive to simplifying the control process and reducing costs.

[0163] The preset time can be set according to actual conditions. As an example, in some embodiments, the preset time is 5 to 10 seconds, for example, 6, 7, 8 or 9 seconds. At this time, the preset time is more appropriate, the action frequency is more appropriate, and it is more conducive to extending the life of the second valve 28, simplifying the control process, and reducing costs.

[0164] In some embodiments, when controlling the second valve 28 of the water replenishing system 2, the opening degree of the second valve 28 is made greater than or equal to a preset minimum opening degree A and less than or equal to a preset maximum opening degree B, where B > A. In this way, the maximum and minimum limits of the opening degree of the second valve 28 during the regulation process can be restricted, so that during the entire regulation process, the opening degree of the second valve 28 will not be too small, so as to avoid too small a flow rate flowing to the second heat exchanger 26 and affecting the cooling of the lubricating oil. Moreover, the opening degree of the second valve 28 will not be too large, so as to avoid too small a flow rate flowing to the first heat exchanger 25 and affecting water replenishment and motor cooling. That is to say, it can effectively meet the lubricating oil cooling requirements while taking into account water replenishment and motor cooling.

[0165] Among them, the values of A and B can be set according to the actual situation. For example, in some embodiments, 10% ≤ A < 20%, and / or, 10% < B ≤ 20%. At this time, the sizes of A and B are more appropriate, which is conducive to controlling the opening degree of the second valve 28 within a more appropriate range, and better taking into account water replenishment and motor cooling while effectively meeting the lubricating oil cooling requirements.

[0166] In addition, in some embodiments, controlling the second valve 28 of the water replenishing system 2 includes:

[0167] Before controlling the opening degree of the second valve 28 according to the oil supply temperature, first make the opening degree of the second valve 28 reach the preset minimum opening degree A and maintain it for t minutes.

[0168] Based on the above steps, after receiving the startup command, the opening degree of the second valve 28 can be first increased from 0% to the preset minimum opening degree A and maintained for t minutes. After that, the opening degree of the second valve 28 is controlled according to the oil supply temperature. This means that after startup, the opening degree of the second valve 28 is quickly increased to the preset minimum opening degree A. In this way, the basic cooling of the lubricating oil can be quickly realized, preventing the lubricating oil from overheating in the initial stage of startup. And it also means that the regulation process of the second valve opening degree according to the oil supply temperature occurs after the second valve opening degree is not lower than the preset minimum opening degree A. Since the detected oil supply temperature is more accurate in the corresponding situation, it is more conducive to realizing an accurate opening degree adjustment process.

[0169] Among them, the size of t can be set according to the actual situation. Exemplarily, 1 ≤ t ≤ 5. For example, it is 2, 3, or 4. At this time, the size of t is more appropriate, which not only facilitates the regulation process of the second valve opening degree according to the oil supply temperature to occur after the basic cooling of the lubricating oil is guaranteed, but also prevents the opening degree of the second valve 28 from not being adjusted according to the oil supply temperature for too long after startup, affecting the further cooling of the lubricating oil.

[0170] In addition, in some embodiments, after the heat pump system 1 receives the start-up command, the water supply pump 23 is first turned on, and the compressor 11 is turned on T1 minute after the water supply pump 23 is turned on. At this time, the compressor 11 is turned on only when there is no problem after the water supply pump 23 is turned on T1 minute, which can prevent the compressor 11 and even the entire heat pump system 1 from being damaged due to the compressor 11 being turned on when the water supply pump 23 fails.

[0171] The value of T1 can be set according to actual conditions. In some embodiments, 1≤T1≤5, for example, 2, 3 or 4. At this time, the delayed start time of the compressor 11 is more appropriate, which can prevent the compressor 11 from starting when the water supply pump 23 fails, and prevent the water supply pump 23 from working for too long before the compressor 11 starts, causing energy waste and other problems.

[0172] In addition, in some embodiments, the water replenishment pump 23 is turned off after the heat pump system 1 is shut down for T2 minutes. At this time, the water replenishment pump 23 is turned off after the heat pump system 1 is shut down for T2 minutes, and can continue to replenish water to the steam generator 12 for T2 minutes after the heat pump system 1 is shut down, effectively preventing dry burning in the steam generator 12.

[0173] The value of T2 can be set according to actual conditions. In some embodiments, 1≤T2≤5, for example, 2, 3 or 4. At this time, the delay time of shutting down the water supply pump 23 is more appropriate, which can prevent dry burning in the steam generator 12 and prevent the water supply pump 23 from working for too long after the heat pump system 1 is shut down, causing energy waste and other problems.

[0174] In addition, in some embodiments, when the water temperature in the water tank 22 is higher than the water tank temperature setting value, water is added to the water tank 22. In this way, the water temperature in the water tank 22 can be lowered by adding new water to the water tank 22, so that the water temperature in the water tank 22 can be reduced to below the water tank temperature setting value, thereby preventing the water temperature in the water tank 22 from being too high, thereby affecting the cooling effect on the motor and the lubricating oil waiting to be cooled.

[0175] Furthermore, in some embodiments, when the water temperature in the water tank 22 is higher than the temperature setting value of the water tank 22 and the water level in the water tank 22 is lower than the upper limit of the water level, not only water is added to the water tank 22, but also water is drained from the water tank 22. In this way, in the process of adding water and adjusting the water temperature in the water tank, the water level in the water tank 22 can be effectively prevented from being higher than the upper limit of the water level by draining water, thereby improving the safety of the water tank water filling and cooling process.

[0176] Specifically, in some embodiments, during the process of draining the water tank 22, if the water temperature in the water tank 22 is lower than the water tank temperature setting value by n°C, the water tank 22 is stopped from draining. In this way, the water temperature in the water tank 22 can be prevented from being too low.

[0177] The value of n can be set according to actual conditions. As an example, in some embodiments, 2≤n≤5. In this case, the value of n is more appropriate, and the water temperature in the water tank 22 can be controlled within a more appropriate range.

[0178] In addition, in some embodiments, the control method further includes: stopping the water tank 22 from draining water after the heat pump system 1 is shut down for T3 minutes. In this way, the water tank 22 can be delayed for T3 minutes before stopping draining water after the heat pump system 1 is shut down. In this way, the water temperature and water level in the water tank 22 can be adjusted within T3 minutes after the heat pump system 1 is shut down, so as to meet the water replenishment and cooling needs of the heat pump system 1, prevent the steam generator 12 from drying out, and quickly cool the object to be cooled.

[0179] The value of T3 can be set according to actual conditions. In some embodiments, 1≤t3≤5, for example, 2, 3 or 4. At this time, the delay of closing the water tank 22 for draining water is more appropriate, which can prevent dry burning in the steam generator 12 and quickly cool the object to be cooled, and prevent the water from draining for too long after shutdown, causing energy waste and other problems.

[0180] The control methods of the aforementioned embodiments can be completed under the control of a controller. Therefore, the present application also provides a controller, which includes a memory and a processor coupled to the memory, and the processor is configured to execute the control method of any embodiment based on instructions stored in the memory.

[0181] Furthermore, the present application also provides a steam generating system, which includes the steam generating device of any embodiment and the controller of any embodiment.

[0182] In addition, the present application also provides a storage medium, which stores computer instructions, and the computer instructions are executed by a processor to implement the control method of any embodiment.

[0183] Next, combine Figure 1 The embodiments described above further introduce the present application.

[0184] like Figure 1 As shown, in this embodiment, the steam generating device 10 includes a heat pump system 1, a water replenishment system 2, a first temperature measuring component 3, a second temperature measuring component 4 and a third temperature measuring component 5.

[0185] The heat pump system 1 includes a compressor 11, a steam generator 12, a throttling device 13, an evaporator 14, an oil tank 16 and an oil pump 17. The compressor 11, the steam generator 12, the throttling device 13 and the evaporator 14 are sequentially connected to form a refrigerant circulation loop 15 for circulating the refrigerant.

[0186] The steam generator 12 includes a shell 121 and a heat exchange tube (not shown). The shell 121 is used to hold water. The shell 121 is provided with a refrigerant inlet 122, a refrigerant outlet 123, a water replenishment port 124 and an exhaust port 125. The refrigerant inlet 122 is connected to the exhaust port 111 of the compressor 11, and the refrigerant outlet 123 is connected to the inlet 112 of the compressor 11 through the throttling device 13. The heat exchange tube is arranged on the side of the shell 121 and is connected to the refrigerant inlet 122 and the refrigerant outlet 123. In this way, the connection between the heat exchange tube and the exhaust port 111 of the compressor 11 and the throttling device 13 can be achieved. When working, the high-temperature gaseous refrigerant discharged by the compressor 11 flows into the heat exchange tube, heating the water in the shell 121 into steam, and realizing the steam generation mode of water in the shell side and refrigerant in the tube side. The generated steam is discharged from the exhaust port 125 for use by steam consuming equipment. A pressure regulating valve 127 is provided at the exhaust port 125 to adjust the steam exhaust pressure. The water replenishment port 124 is used to connect to the water replenishment system 2 to replenish water into the shell 11 of the steam generator 12 to make up for the consumed steam. A liquid level meter 126 is provided in the steam generator 12 to detect the liquid level in the steam generator 12 and facilitate water replenishment control.

[0187] In this embodiment, the refrigerant outlet 123 is also thermally coupled to the motor of the compressor 11 through the cooling pipe 18, so that the refrigerant flowing out of the steam generator 12 can flow to the motor of the compressor 11 to cool the motor of the compressor 11.

[0188] In addition, the oil tank 16 is filled with lubricating oil, which is connected to the compressor 11 through a lubricating pipeline 19, so that the lubricating oil is supplied to the compressor 11 under the action of the oil pump 17 to lubricate the components in the compressor 11. The lubricating pipeline 19 is provided with a second temperature measuring member 4 to detect the temperature of the lubricating oil flowing to the compressor 11.

[0189] In this embodiment, the lubricating oil and the motor of the compressor 11 constitute two objects to be cooled.

[0190] The water replenishment system 2 includes a one-way valve 20 , a water treatment device 21 , a water tank 22 , a water replenishment pump 23 , a water replenishment pipeline 24 , a first heat exchanger 25 , a second heat exchanger 26 , a first valve 27 , a second valve 28 and a drain valve 29 .

[0191] The water treatment device 21 is connected to the municipal water source and the water tank 22 to soften the municipal water and send the softened soft water to the water tank 22 .

[0192] The water tank 22 stores soft water and is connected to the water replenishment port 124 through the water replenishment pipeline 24 to replenish water to the steam generator 12 .

[0193] The drain valve 29 and the third temperature measuring component 5 are both arranged on the water tank 22 , and are used to control whether the water tank 22 drains water and detect the water temperature in the water tank 22 , respectively.

[0194] The water supply pipeline 24 connects the water tank 22 and the water supply port 124, and is thermally coupled to the motor of the compressor 11 and the lubricating oil through the first heat exchanger 25 and the second heat exchanger 26 to cool the lubricating oil and the motor of the compressor 11, and replenishes the water after cooling the motor of the compressor 11 into the steam generator 12. Figure 1 As shown, in this embodiment, the water supply pipeline 24 includes a first water supply pipeline 241, a second water supply pipeline 242, a first water return pipeline 243 and a second water return pipeline 244. The first water supply pipeline 241 connects the water tank 22 and the water supply port 124, and is provided with a water supply pump 23, a second valve 28, a first heat exchanger 25, a first temperature measuring element 3, a first valve 27 and a one-way valve 20 in sequence along the flow direction of the water flow. The first heat exchanger 25 is a plate heat exchanger, which is also connected to the cooling pipeline 18. The first temperature measuring element 3 detects the temperature of the water flowing out of the first heat exchanger 25. The first water return pipeline 243 connects the first valve 27 and the water tank 22. The second water supply pipeline 242 is connected to the second valve 28. The second heat exchanger 26 is a plate heat exchanger, which is arranged on the second water supply pipeline 242 and connected to the portion of the lubrication pipeline 19 located between the second temperature measuring component 4 and the oil pump 17 , and connected to the water tank 22 through the second return water pipeline 244 .

[0195] It can be seen that in this embodiment, the heat pump system 1 integrates the steam generator 12, and the corresponding steam generator 12 replaces the condenser of the conventional heat pump unit, and the tube side uses high-temperature and high-pressure refrigerant, and the shell side uses external water supply, and the water supply is directly flashed in the shell side after being heated by the refrigerant in the tube side. Since the unit integrates the steam generator 12, there is no need to match the flash tank and the circulating pump, so the integration is greatly increased, the cost advantage is obvious, and it can effectively solve the problem that the heat pump only produces hot water but not steam.

[0196] The consumed steam is replenished by softened make-up water after engineering treatment. The make-up water first cools the motor and lubricating oil of the compressor 11 of the unit, and preheats itself at the same time. Then, the softened water that cools the motor enters the steam generator 12 to complete the make-up water. In this way, the problem that the motor and lubricating oil of the compressor 11 are cooled in a single way and can only be cooled by refrigerant and are restricted by the evaporation temperature can be effectively solved, and the temperature of the make-up water entering the steam generator 12 can be effectively increased, so that the steam preparation efficiency and energy efficiency can be effectively improved while effectively cooling the motor and lubricating oil of the compressor 11, and the temperature of the prepared steam can be increased.

[0197] The working process of the steam generating device 10 of this embodiment is roughly as follows:

[0198] The compressor 11 absorbs the gaseous refrigerant from the evaporator 14. The corresponding gaseous refrigerant is compressed by the compressor 11 and becomes a high-temperature and high-pressure gaseous refrigerant. It enters the heat exchange tube of the steam generator 12 through the refrigerant inlet 122 of the steam generator 12, is condensed into a high-pressure liquid refrigerant by the make-up water on the shell side, and is then discharged through the refrigerant outlet 123. After being throttled by the throttling device 13, it enters the evaporator 14. In the corresponding process, water flows from the shell side of the steam generator 12, is heated by the high-temperature and high-pressure refrigerant on the tube side, and becomes high-temperature water, and at the same time flashes out high-temperature steam. When the steam pressure in the steam generator 12 reaches the opening pressure of the pressure regulating valve 127, the pressure regulating valve 127 automatically opens to provide steam for the steam consuming equipment, and the consumed steam is supplemented by the softened water entering through the make-up water inlet 124.

[0199] The softened water used for water replenishment is provided by the water replenishment system 2. During operation, municipal water enters the water treatment device 21 and is softened. Then, the softened water enters the water tank 22. The water replenishment pump 23 extracts the softened water in the water tank 22 and enters the water replenishment pipeline 24. The water replenishment pump 23 is divided into two paths at the second valve 28. One path enters the second heat exchanger 26 and fully exchanges heat with the lubricating oil flowing from the oil tank 16 to the compressor 11. The softened water after cooling the lubricating oil returns to the water tank 22. After the lubricating oil cools down, it enters the compressor 11 to lubricate the bearings and other components, and then returns to the oil tank 16. The other path after passing through the second valve 28 enters the second heat exchanger 26. A heat exchanger 25 supercools the high-temperature and high-pressure liquid refrigerant from the refrigerant outlet 123 of the steam generator 12. The supercooled liquid refrigerant enters the motor winding cooling channel after throttling and reducing the pressure through the bottom stop valve of the compressor 11, thereby cooling the motor winding to prevent the motor from overheating and demagnetizing. At the same time, the softened water absorbs the heat of the liquid refrigerant and is preheated, thereby greatly improving the system energy efficiency. The preheated softened water is divided into two paths through the first valve 27, one path enters the water replenishment port 124 through the one-way valve 20, and the other path returns to the water tank 22.

[0200] In order to meet the water replenishment demand of the steam generator 12 and the cooling demand of the motor and lubricating oil, and to increase the replenishment water preheating temperature, in this embodiment, the replenishment water pump 23, the first valve 27, the second valve 28, and the drain valve 29 are controlled in the following manner:

[0201] (1) Control method of water supply pump 23

[0202] The water replenishment pump 23 is a fixed frequency pump, and adopts a control mode of early opening and delayed closing.

[0203] Specifically, when the heat pump system 1 receives a startup command, the water supply pump 23 is started 1 to 5 minutes earlier than the compressor 11. After ensuring that the water supply pump 23 is fault-free, the compressor 11 is started. The water supply pump 23 remains turned on during startup. After the heat pump system 1 is shut down, the water supply pump 23 is shut down with a delay of 1 to 5 minutes to prevent dry burning in the steam generator 12.

[0204] (2) Control method of the first valve 27

[0205] The first valve 27 is an electric three-way valve. When the outlet of the first valve 27 connected to the water replenishment port 124 is fully opened, and the outlet connected to the water tank 22 is fully closed, the replenishment water will all flow to the water replenishment port 124.

[0206] When the heat pump unit is in shutdown state, the opening of the first valve 27 (specifically, the opening of the outlet of the first valve 27 connected to the water supply port 124) is 0%. After the unit receives the start-up command, the opening of the first valve 27 is automatically controlled according to the liquid level in the steam generator 12 detected by the liquid level meter 126. It is automatically opened when it is lower than the preset liquid level, and automatically closed when it is higher than the preset liquid level. The opening is adjustable within 0-100%. The opening control variable of the first valve 27 only involves the liquid level. There are many mature control methods, which will not be repeated here.

[0207] When the unit receives the shutdown command, the target opening of the first valve 27 is continuously controlled according to the preset liquid level, and is closed to 0% opening after 1 to 5 minutes, and the water supply pipeline 24 is disconnected from the water supply port 124 to stop water supply.

[0208] (2) Control method of the second valve 28

[0209] The second valve 28 is an electric three-way valve, and its opening (specifically refers to the opening of the outlet of the second valve 28 connected to the second heat exchanger 26) is limited by a preset minimum opening A and a preset maximum opening B. After the system operates stably, it is controlled by the oil supply temperature and the make-up water temperature, and the action amplitude |D|% of each opening adjustment is subject to a maximum amplitude limit.

[0210] Specifically, when the outlet of the second valve 28 connected to the second heat exchanger 26 is fully opened and the outlet connected to the first heat exchanger 25 is fully closed, the make-up water will all flow to the lubricating oil side to cool the lubricating oil. Therefore, when the heat pump system 1 is turned on, while cooling the lubricating oil, in order to meet the make-up water flow and motor cooling requirements, the maximum opening of the second valve 28 is limited to B, that is, the preset maximum opening is B, to meet the make-up water and motor cooling requirements, and the minimum opening of the second valve 28 is limited to A, that is, the preset minimum opening is A, to meet the lubricating oil cooling requirements. Among them, B>A, and the range of B and A is 10-20%.

[0211] When the heat pump system 1 is in shutdown state, the target opening of the second valve 28 is 0%. After the unit receives a startup command, the target opening of the second valve 28 increases from 0% to A and lasts for 1 to 5 minutes.

[0212] After 1 to 5 minutes, the second valve 28 enters the automatic adjustment mode. During the startup operation, the opening degree is between A and B. In the automatic adjustment mode, the second valve 28 is controlled by the oil supply temperature and the water supply temperature (i.e., the temperature of the water flowing to the water supply port 124). It performs an action every 5 to 10 seconds, and the amplitude of each action |D|% does not exceed 3% (if it exceeds 3%, it will be 3%).

[0213] In automatic adjustment mode, the parameters used are:

[0214] Oil supply temperature difference ΔT1 = oil supply temperature - oil supply temperature setting value; and

[0215] Make-up water temperature difference ΔT2 = make-up water temperature - make-up water temperature setting value.

[0216] When the oil supply temperature T1 ≥ 35°C, the calculation formula of the D value of the action amplitude |D|% is D = 0.7*ΔT1+0.3*ΔT2; and when the oil supply temperature T1 < 35°C, the calculation formula of the D value of |D|% is D = 0.8*ΔT1.

[0217] According to the different D values ​​obtained by calculation, different control strategies are adopted as follows:

[0218] When D>0.5, the opening of the second valve 28 increases by |D|%;

[0219] When 0.5 ≥ D ≥ -0.5, the opening of the second valve 28 remains unchanged;

[0220] When D<-0.5, the opening degree of the second valve 28 decreases by |D|%.

[0221] Since D=0.5 has little effect on the temperature, the above control strategy is adopted to maintain the temperature when the amplitude is small and open or close the temperature accordingly when the amplitude is large, so as to prevent the second valve 28 from moving back and forth, so as to avoid affecting the life of the second valve 28 due to repeated back and forth movements.

[0222] When the unit receives the shutdown command, the opening of the second valve 28 changes from the current opening to 0%, and the use of softened water to cool the lubricating oil stops.

[0223] (4) Control method of drain valve 29

[0224] The drain valve 29 is a solenoid valve, and its opening and closing is related to the water tank filling operation. When the drain valve 29 is opened and the water tank is drained, water is added to the water tank 22.

[0225] When the heat pump system is shut down, the drain valve 29 remains closed.

[0226] After receiving the power-on command, the heat pump system 1 detects the water temperature in the water tank 22 in real time. When the water temperature in the water tank 22 is higher than the water tank temperature setting value, the drain valve 29 is opened and water is replenished; when the water temperature in the water tank 22 is 2 to 5°C lower than the water tank temperature setting value, the drain valve 29 is closed.

[0227] After the heat pump system 1 receives the shutdown command, the drain valve 29 continues to be controlled according to the set value of the water tank temperature, and the drain valve 29 is closed after 1 to 5 minutes.

[0228] The water replenishment of the water tank 22 is controlled by the project. When the water level in the water tank is lower than the lower limit of the water level, or the water level in the water tank is lower than the upper limit of the water level and the drain valve 29 is opened, water is automatically replenished into the water tank 22 when one of the two conditions is met, and the water replenishment is stopped when the water level reaches the upper limit of the water level.

[0229] It can be seen that in this embodiment, the heat pump system 1 can directly flash steam while generating hot water, without the need for engineering matching of flash tanks and circulating water supply pumps. It has a simple structure and can directly replace the boiler. In addition, the motor and lubricating oil of the heat pump system 1 are waiting for the cooling of the cooling object, and the water supply can be directly used as a cold source. The cooling effect is no longer limited by the evaporation temperature. At the same time, the heat generated by the unit's own motor can preheat the water supply, and the water supply can be converted into steam after preheating, which can greatly improve the energy efficiency. Moreover, a fixed-frequency water supply pump + an electric three-way water valve is used, and combined with a liquid level meter, a temperature measuring component, a heat exchanger, and a drain valve, in conjunction with the unit controller, the cooling of each object to be cooled in the unit and the water supply flow and water supply preheating temperature required after steam generation can be accurately controlled, thereby achieving efficient and reliable operation of the steam generating equipment 10.

[0230] This embodiment only takes the heat pump system 1 including a one-stage compressor as an example for explanation. However, it should be noted that, depending on the difference between the heat source temperature and the output temperature, the compressor 11 is not limited to single-stage compression, but can be two-stage compression, or three-stage or four-stage compression with two compressors 11 connected in series. Depending on the number of compression stages, corresponding cooling motor flow paths (i.e., cooling pipeline 18) and cooling lubricating oil flow paths (i.e., second water supply pipeline 242) can be set. For example, if two compressors 11 are connected in series, the supercooled refrigerant of the cooling motor can be divided into two cooling motors, and at the same time, the water replenishment is divided into two cooling lubricating oils.

[0231] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A steam generating device (10), characterized in that: include: A heat pump system (1), comprising a compressor (11), a steam generator (12), a throttling device (13) and an evaporator (14), wherein the compressor (11), the steam generator (12), the throttling device (13) and the evaporator (14) are sequentially connected to form a refrigerant circulation loop (15) for circulating a refrigerant, the steam generator (12) uses the refrigerant to heat water into steam, and the steam generator (12) has a water supply port (124); and A water replenishment system (2) comprises a water tank (22), a water replenishment pump (23) and a water replenishment pipeline (24); the water replenishment pipeline (24) is connected to the water tank (22) and the water replenishment port (124), and is thermally coupled to at least one object to be cooled of the heat pump system (1); the water replenishment pump (23) is arranged on the water replenishment pipeline (24) to drive the water in the water tank (22) to directly or indirectly cool the at least one object to be cooled, and drives the water after cooling the at least one object to be cooled to flow to the water replenishment port (124) to replenish water for the steam generator (12).

2. The steam generating device (10) according to claim 1, characterized in that: The at least one object to be cooled includes a motor of the compressor (11); the refrigerant outlet (123) of the steam generator (12) is thermally coupled to the motor via a cooling pipeline (18) so as to utilize the refrigerant flowing out of the steam generator (12) to cool the motor; the water supply pipeline (24) includes a first water supply pipeline (241); the first water supply pipeline (241) is connected to the water tank (22) and the water supply port (124); a first heat exchanger (25) is provided on the first water supply pipeline (241); the first heat exchanger (25) is connected to the cooling pipeline (18) so that water in the water tank (22) flows through the first heat exchanger (25) in the process of flowing toward the water supply port (124), and cools the refrigerant flowing from the refrigerant outlet (123) to the motor at the first heat exchanger (25).

3. The steam generating device (10) according to claim 2, characterized in that: The water replenishment pipeline (24) further comprises a first water return pipeline (243), wherein the first water return pipeline (243) is connected to the water tank (22) and is connected to a portion of the first water supply pipeline (241) located between the first heat exchanger (25) and the water replenishment port (124) so ​​as to guide water flowing out of the first heat exchanger (25) back to the water tank (22).

4. The steam generating device (10) according to claim 3, characterized in that: The water replenishment system (2) further comprises a first valve (27), wherein the first valve (27) is arranged at the connection between the first water return pipeline (243) and the first water supply pipeline (241) to control the flow rate from the first heat exchanger (25) to the water replenishment port (124) and the first water return pipeline (243).

5. The steam generating device (10) according to any one of claims 1 to 4, characterized in that: The heat pump system (1) comprises an oil tank (16), the oil tank (16) being connected to the compressor (11) via a lubricating pipeline (19) so as to supply lubricating oil to the compressor (11) to lubricate the compressor (11), the at least one object to be cooled comprising the lubricating oil, the water supply pipeline (24) comprising a second water supply pipeline (242), the second water supply pipeline (242) being connected to the water tank (22), a second heat exchanger (26) being provided on the second water supply pipeline (242), the second heat exchanger (26) being connected to the lubricating pipeline (19) so as to cool the lubricating oil flowing to the compressor (11) by water flowing from the water tank (22) into the second water supply pipeline (242).

6. The steam generating device (10) according to claim 5, characterized in that: The second water supply pipeline (242) is connected to the first water supply pipeline (241) of the water replenishment pipeline (24) at a portion located between the first heat exchanger (25) and the water tank (22).

7. The steam generating device (10) according to claim 6, characterized in that: The water replenishment system (2) further comprises a second valve (28), which is arranged at the connection between the first water supply pipeline (241) and the second water supply pipeline (242) and controls the flow rate from the water tank (22) to the first heat exchanger (25) and the second heat exchanger (26).

8. The steam generating device (10) according to claim 5, characterized in that: The water replenishment pipeline (24) also includes a second water return pipeline (244), which connects the second heat exchanger (26) and the water tank (22) to guide the water after cooling the lubricating oil back to the water tank (22).

9. The steam generating device (10) according to any one of claims 1 to 4, characterized in that: The steam generator (12) comprises a shell (121) and a heat exchange tube. The shell (121) is used to contain water. The water replenishment port (124) is arranged on the shell (121). The heat exchange tube is connected to the shell (121) and is connected to the outlet (111) of the compressor (11) and the throttling element (13) so that the high-temperature gaseous refrigerant discharged from the compressor (11) flows into the heat exchange tube and heats the water in the shell (121) into steam.

10. The steam generating device (10) according to any one of claims 1 to 4, characterized in that: The water replenishment pump (23) is a fixed frequency pump.

11. A method for controlling a steam generating device (10) according to any one of claims 1 to 10, characterized in that: include: Determining whether the steam generator (12) needs water replenishment; When the steam generator (12) needs to be replenished with water, the water replenishment pipeline (24) is connected to the water replenishment port (124) of the steam generator (12), and the water replenishment system (2) replenishes water for the steam generator (12).

12. The control method according to claim 11, characterized in that: Placing the water replenishment pipeline (24) in communication with the water replenishment port (124) of the steam generator (12) comprises: The first water supply pipeline (241) of the water replenishment pipeline (24) is connected to the water replenishment port (124) so ​​that water flows through the first heat exchanger (25) on the first water supply pipeline (241) while flowing toward the water replenishment port (124), and cools the refrigerant flowing from the refrigerant outlet (123) of the steam generator (12) to the motor of the compressor (11) at the first heat exchanger (25).

13. The control method according to claim 11, characterized in that: The control method further comprises: After the heat pump system (1) receives a shutdown command, disconnect the make-up water pipeline (24) from the make-up water port (124) within P minutes.

14. The control method according to claim 13, characterized in that: 1≤P≤5。 15. The control method according to any one of claims 11 to 14, characterized in that: The control method further includes: Controlling a second valve (28) of the make-up water system (2) to control the flow rate of a first heat exchanger (25) on a first water supply pipeline (241) flowing from the water tank (22) to the make-up water pipeline (24) for cooling the motor of the compressor (11), and the flow rate of a second heat exchanger (26) on a second water supply pipeline (242) flowing from the water tank (22) to the make-up water pipeline (24) for cooling the lubricating oil for lubricating the compressor (11).

16. The control method according to claim 15, characterized in that: Controlling the second valve (28) of the make-up water system (2) includes: Controlling the opening degree of the second valve (28) according to the oil supply temperature, where the oil supply temperature is the temperature of the lubricating oil flowing to the compressor (11).

17. The control method according to claim 16, characterized in that: Controlling the opening degree of the second valve (28) according to the oil supply temperature includes: Determining a D value according to the oil supply temperature to determine the action amplitude |D|%; Controlling the opening degree of the second valve (28) according to the determined D value.

18. The control method according to claim 17, characterized in that: Determining a D value according to the oil supply temperature includes: When the actual oil supply temperature is greater than or equal to the preset temperature, D = a*ΔT1 + b*ΔT2; and / or, When the actual oil supply temperature is less than the preset temperature, D = c*ΔT1; Wherein, ΔT1 = actual oil supply temperature - set oil supply temperature, ΔT2 = actual make-up water temperature - set make-up water temperature, a + b = 1, a ≥ b.

19. The control method according to claim 18, characterized in that: 0.5 ≤ a < 1; and / or, 0 < b ≤ 0.5; and / or, 0.5 ≤ c ≤ 1; and / or, the preset temperature is 30 - 40°C.

20. The control method according to claim 17, characterized in that: Controlling the opening degree of the second valve (28) according to the determined D value includes at least one of the following: When D > m, increase the opening degree of the second valve (28) by 1D|%; When D < -m, decrease the opening degree of the second valve (28) by |D|%; When -m ≤ D ≤ m, keep the opening degree of the second valve (28) unchanged; Wherein, m > 0.

21. The control method according to claim 20, characterized in that: 0.4≤m≤0.6。 22. The control method according to claim 17, characterized in that: 1D |％≤3％。 23. The control method according to claim 16, characterized in that: When controlling the opening degree of the second valve (28) according to the oil supply temperature, control the opening degree of the second valve (28) according to the oil supply temperature every preset time.

24. The control method according to claim 23, characterized in that: The preset time is 5 - 10s.

25. The control method according to claim 15, characterized in that: When controlling the second valve (28) of the make-up water system (2), make the opening degree of the second valve (28) greater than or equal to a preset minimum opening degree A and less than or equal to a preset maximum opening degree B, where B > A.

26. The control method according to claim 25, characterized in that: 10% ≤ A < 20%, and / or, 10% < B ≤ 20%.

27. The control method according to claim 16, characterized in that: Controlling the second valve (28) of the make-up water system (2) includes: Before controlling the opening degree of the second valve (28) according to the oil supply temperature, first make the opening degree of the second valve (28) reach the preset minimum opening degree A and keep it for t minutes.

28. The control method according to claim 27, characterized in that: 1≤t≤5。 29. The control method according to any one of claims 11 to 14, characterized in that: The control method further includes at least one of the following: After the heat pump system (1) receives a start-up command, the water supply pump (23) is first turned on, and after the water supply pump (23) is turned on for T1 minute, the compressor (11) is turned on; After the heat pump system (1) is shut down for T2 minutes, the water supply pump (23) is turned off; When the water temperature in the water tank (22) is higher than the water tank temperature setting value, and the water level in the water tank (22) is lower than the water level upper limit, water is added to the water tank (22).

30. The control method according to claim 29, characterized in that: 1≤T1≤5; and / or, 1≤T2≤5; and / or, when the water temperature in the water tank (22) is higher than the water tank temperature setting value and the water level in the water tank (22) is lower than the water level upper limit, not only water is added to the water tank (22), but also water is drained from the water tank (22).

31. The control method according to claim 30, characterized in that: During the process of draining the water tank (22), if the water temperature in the water tank (22) is lower than the water tank temperature setting value by n°C, the water tank (22) is stopped from draining; and / or the control method further comprises: after the heat pump system (1) is shut down for T3 minutes, the water tank (22) is stopped from draining.

32. The control method according to claim 31, characterized in that: 2≤n≤5; and / or, 1≤T3≤5.

33. A controller, characterized in that: It comprises a memory and a processor coupled to the memory, wherein the processor is configured to execute the control method according to any one of claims 1 to 32 based on instructions stored in the memory.

34. A steam generating system, characterized in that: It comprises a steam generating device as described in any one of claims 1-10, and a controller as described in claim 33.

35. A storage medium, characterized in that: The storage medium stores computer instructions, and the computer instructions are executed by the processor as the control method according to any one of claims 1-32.

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