A high temperature heat pump system safety protection method and device

Abstract

The present invention relates to a safety protection method and device for a high-temperature heat pump system, wherein the high-temperature heat pump system comprises: a water circulation coil, each circle of the water circulation coil is provided with an opening; a water circulation stroke adjustment device, wherein the connection joint driving member moves up and down to adjust the number of circles; the safety protection method comprises the following steps: S1, calculating the temperature change rate of a heat exchange medium passing through the water circulation coil; S2, acquiring data of the temperature sensor, and respectively calculating and predicting the water outlet temperature according to the data of the temperature sensor; S3, calculating the number of circles of the upper water circulation coil according to the temperature change rate, with the temperature of the water inlets of the first heat exchanger and the second heat exchanger being the same as a constraint; S4, controlling the longitudinal driving member to drive the connection joint to the position of the corresponding opening according to the number of circles of the upper water circulation coil; and S5, controlling the connection joint driving member to drive the connection joint to access the corresponding opening.

Description

Technical Field

[0001] The invention relates to the field of safety protection of heat pump systems, and in particular to a safety protection method and device for high-temperature heat pump systems. Background Art

[0002] The heat pump system includes a heat pump and an energy storage tank, wherein the heat pump is composed of an evaporator, a compressor, a condenser, and a throttling device. The heat pump system extracts heat from an external low-level heat source through the heat pump and outputs a high-temperature heat exchange medium at the condenser, and then passes through the outer wall of the energy storage tank through a water circulation coil, thereby storing the heat energy extracted by the heat pump in the liquid in the energy storage tank to form hot water.

[0003] The external low-temperature heat source can be air, groundwater, soil, industrial wastewater, etc. In the multi-source coupled high-temperature steam heat pump technology, multiple heat pumps are used to extract the heat from different low-temperature heat sources to form a high-temperature heat exchange medium, and then the heat exchange medium is passed through the energy storage tank through a water circulation coil, thereby exchanging the heat energy in the heat exchange medium to the energy storage tank to obtain hot water. The prior art is to set a plurality of coiled water circulation coils on the outer wall of the energy storage tank through an insulation layer, and switch through a multi-way valve, so that only one high-temperature heat exchange medium output by a heat pump passes through the water circulation coil for heat exchange at a time, thereby obtaining hot water in the energy storage tank.

[0004] The existing technology cannot realize that multiple heat pumps can output high-temperature heat exchange medium at the same time and transport it to the energy storage tank because the temperature of the low-temperature heat source is different under the conditions of weather changes, seasonal changes, etc. If multiple water circulation coils are set and the heat exchange medium output by multiple heat pumps passes through the water circulation coils at the same time, on the one hand, it is difficult for the existing technology to adjust multiple heat pumps. After the heat pump continues to work at the same power for a period of time, the temperature of the heat exchange medium output by the heat pump corresponding to the external low-temperature heat source with a higher temperature continues to rise, while the temperature of the heat exchange medium output by the heat pump corresponding to the external low-temperature heat source with a lower temperature continues to decrease. Eventually, the two lose balance and overheating or overcooling occurs; on the other hand, the existing technology controls and adjusts the temperature difference between the heat exchange medium output temperature and the reflux temperature of the heat pump. Since it may take 15 minutes or even longer for the heat exchange medium to complete a complete cycle in the heat pump, multiple external low-temperature heat sources are easily affected by different external environments, and the existing technology has a high hysteresis for adjusting multiple heat pumps. Therefore, for multiple heat pumps to output high-temperature heat exchange medium at the same time and transport it to the energy storage tank, it is easy to be overloaded or underloaded and damaged.

[0005] The purpose of the present invention is to design a high-temperature heat pump system safety protection method and device in view of the above-mentioned problems in the prior art. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a high-temperature heat pump system safety protection method and device, which can effectively solve at least one problem existing in the above-mentioned prior art.

[0007] The technical solution of the present invention is:

[0008] A high temperature heat pump system safety protection method,

[0009] The high temperature heat pump system comprises:

[0010] a first heat exchanger and a second heat exchanger;

[0011] Energy storage tank;

[0012] A water circulation coil, the water circulation coil is arranged on the outer wall of the energy storage tank, each circle of the water circulation coil is provided with an opening, the opening is closed by a blocking mechanism, and all the openings are arranged longitudinally;

[0013] A water circulation stroke adjustment device, comprising a longitudinal drive member, a connecting joint, and a connecting joint drive member, wherein the connecting joint drive member drives the connecting joint to move toward one of the openings, the connecting joint is internally divided into two chambers and respectively connected to the first heat exchanger and the second heat exchanger, after the connecting joint is connected to one of the openings, the connecting joint separates the water circulation coil to form an upper water circulation coil and a lower water circulation coil, the water outlet of the first heat exchanger, the upper water circulation coil, the connecting joint, and the water inlet of the first heat exchanger form a first water circulation, the water outlet of the second heat exchanger, the connecting joint, the lower water circulation coil, and the water inlet of the second heat exchanger form a second water circulation, and the longitudinal drive member drives the connecting joint drive member to move up and down to adjust the number of turns of the upper water circulation coil or the lower water circulation coil;

[0014] Temperature sensors are respectively arranged at the water outlets of the first heat exchanger and the second heat exchanger;

[0015] The safety protection method comprises the following steps:

[0016] S1, calculating the temperature change rate of the heat exchange medium passing through the water circulation coil;

[0017] S2, obtaining data from the temperature sensor, and calculating predicted outlet temperatures of the first heat exchanger and the second heat exchanger after a first time period, respectively, according to the data from the temperature sensor;

[0018] S3, under the condition of predicted water outlet temperature, with the water inlet temperatures of the first heat exchanger and the second heat exchanger being the same as a constraint, calculating the number of turns of the water supply circulation coil according to the temperature change rate;

[0019] S4, controlling the longitudinal drive member to drive the connection joint to a corresponding opening position according to the number of turns of the water circulation coil;

[0020] S5, controlling the connection joint driving member to drive the connection joint to connect to the corresponding opening.

[0021] Furthermore, step S1 is specifically as follows:

[0022] The temperature change ΔT of the heat exchange medium passing through the water circulation coil and the number of turns N of the water circulation coil are obtained, and the temperature change rate S=ΔT / N is calculated.

[0023] Further, in step S2, the first time period is the time required for the heat exchange medium in the corresponding heat exchanger to circulate once.

[0024] Further, in step S2, respectively calculating the predicted water outlet temperatures of the first heat exchanger and the second heat exchanger after a first time period according to the data of the temperature sensor includes:

[0025] Obtaining the temperature of the environment where the corresponding heat exchanger is located after a first time period;

[0026] A relationship between the ambient temperature and the heating rate of the corresponding heat exchanger is obtained, and the predicted outlet temperatures of the first heat exchanger and the second heat exchanger after the first time period are calculated according to the temperature of the ambient temperature after the first time period.

[0027] Further, if the heat exchanger is an air source heat exchanger, the temperature of the environment after the first time period is obtained according to the weather forecast data;

[0028] If the heat exchanger is a ground source heat exchanger, an underground temperature prediction model is generated by a target learning algorithm, and the temperature of the environment after a first time period is calculated by the underground temperature prediction model;

[0029] If the heat exchanger is an industrial wastewater source heat exchanger, the temperature of the environment after the first time period is calculated by obtaining the industrial wastewater discharge time, discharge volume, and discharge temperature.

[0030] Furthermore, the underground temperature prediction model is generated by:

[0031] Collect underground temperature data of different geographical locations, climates, geology, underground depths, and surface temperatures to construct underground temperature training samples;

[0032] A prediction model is constructed using a neural network model, and data samples of different geographical locations, climates, geology, underground depths, and surface temperature are used as inputs of the prediction model, and underground temperature data samples are used as outputs of the prediction model. The prediction model is trained to obtain an underground temperature prediction model.

[0033] Furthermore, step S3 is specifically as follows:

[0034] Define M as the number of turns of the water circulation coil, A as the predicted outlet temperature of the first heat exchanger, and B as the predicted outlet temperature of the second heat exchanger. After calculating M, round it to the integer to get the number of turns of the water circulation coil.

[0035] Furthermore, the interior of the connecting joint is divided into two chambers by a partition plate, and the connecting joint is provided with water guide ports corresponding to the two chambers at one end close to the water circulation coil.

[0036] Furthermore, the blocking mechanism includes a plug, and the water circulation coil is provided with an elastic member at the opening, the elastic member is connected to the plug, and the elastic member enables the plug to have a movement tendency to move toward the opening.

[0037] A high-temperature heat pump device is further provided, which implements the high-temperature heat pump system safety protection method during operation.

[0038] Therefore, the present invention provides the following effects and / or advantages:

[0039] The present application forms a first water circulation and a second water circulation by combining two heat exchangers with an upper water circulation coil and a lower water circulation coil respectively, so that the two heat exchangers can work simultaneously. The heat exchange medium of the two heat exchangers passes through the corresponding number of turns of the water circulation coil independently, which can balance the two heat exchangers and prevent the evaporator of the heat exchanger from being overcooled or overheated, thereby achieving the effect of coupling multiple heat exchangers and providing safety protection.

[0040] The present application combines an upper water circulation coil and a lower water circulation coil with an adjustable number of turns, and predicts the output temperatures of the two heat exchangers, so that the corresponding number of coil turns of the two heat exchangers under balanced conditions can be accurately calculated.

[0041] The present application predicts the water outlet temperature, combines the specific conditions of the environment in which the heat exchanger is located, and matches different ambient temperature predictions according to gas heat, geothermal heat, and wastewater heat exchangers, so as to obtain a more accurate water outlet temperature based on the relationship between the ambient temperature and the heating rate of the corresponding heat exchanger.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0043] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0045] Figure 2 It is a functional schematic diagram of an embodiment of the present invention.

[0046] Figure 3 It is a structural schematic diagram of the water circulation coil and the water circulation stroke adjustment device.

[0047] Figure 4 It is a schematic diagram of the structure of the connecting joint and the connecting joint driving part.

[0048] Figure 5 A cross-sectional view of a connecting joint and a connecting joint drive member.

[0049] Figure 6 It is a cross-sectional view of the water circulation coil and the water circulation stroke adjustment device.

[0050] Figure 7 This is a relationship diagram between ambient temperature and the heating rate of the corresponding heat exchanger.

[0051] Description of reference numerals:

[0052] The first heat exchanger 1, the second heat exchanger 2, the energy storage tank 3, the water circulation coil 4, the opening 401, the upper water circulation coil 402, the lower water circulation coil 403, the blocking mechanism 5, the plug 501, the elastic member 502, the elastic member accommodating chamber 503, the water circulation stroke adjustment device 6, the longitudinal driving member 601, the connecting joint driving member 602, the connecting joint 603, the first connecting port 6031, the second connecting port 6032, the partition plate 6033, and the water guide port 6034. DETAILED DESCRIPTION

[0053] In order to facilitate understanding by those skilled in the art, the present invention is now described in further detail by way of examples:

[0054] A high temperature heat pump system safety protection method,

[0055] The high temperature heat pump system comprises: Figure 1-6 ,

[0056] A first heat exchanger 1 and a second heat exchanger 2;

[0057] Energy storage tank 3;

[0058] In this embodiment, the first heat exchanger 1 and the second heat exchanger 2 are directly adopted from the prior art, and can be air source heat pumps or solar energy heat pumps, etc., which are not limited here. The first heat exchanger 1 and the second heat exchanger 2 can extract heat energy from an external heat source to obtain a heat exchange medium with a higher temperature. The energy storage tank 3 can be a liquid tank, which can store liquid. The energy storage tank 3 exchanges heat with the heat exchange medium output by the first heat exchanger 1 and the second heat exchanger 2, thereby heating the liquid in the energy storage tank 3. In this embodiment, the heat exchange medium can be water. The first heat exchanger 1 in this embodiment is a ground source heat pump, and the second heat exchanger 2 is an air source heat pump.

[0059] A water circulation coil 4, wherein the water circulation coil 4 is arranged on the outer wall of the energy storage tank 3, each circle of the water circulation coil 4 is provided with an opening 401, the opening 401 is closed by a blocking mechanism 5, and all the openings 401 are arranged longitudinally;

[0060] In this embodiment, when all openings 401 of the water circulation coil 4 are closed, a single liquid circulation path from top to bottom is formed, and liquid can enter from one end of the water circulation coil 4 and flow out from the other end. The periphery of the water circulation coil 4 can be coated with an insulation layer.

[0061] The water circulation stroke adjustment device 6 includes a longitudinal drive member 601, a connection joint 603, and a connection joint drive member 602. The connection joint drive member 602 drives the connection joint 603 to move toward one of the openings 401. The connection joint 603 is divided into two chambers and connected to the first heat exchanger 1 and the second heat exchanger 2 respectively. After the connection joint 603 is connected to one of the openings 401, the connection joint 603 separates the water circulation coil 4 to form the upper water circulation coil 402 and the lower water circulation coil 403. The lower water circulation coil 403, the water outlet of the first heat exchanger 1, the upper water circulation coil 402, the connecting joint 603, and the water inlet of the first heat exchanger 1 form a first water circulation, the water outlet of the second heat exchanger 2, the connecting joint 603, the lower water circulation coil 403, and the water inlet of the second heat exchanger 2 form a second water circulation, and the longitudinal driving member 601 drives the connecting joint driving member 602 to move up and down to adjust the number of turns of the upper water circulation coil 402 or the lower water circulation coil 403;

[0062] In this embodiment, the water circulation stroke adjustment device 6 is one of the core improvements. By arranging all the openings 401 longitudinally, the longitudinal driving member 601 can longitudinally traverse any opening 401 in the process of driving the connecting joint 603 to move, so that the connecting joint 603 can extend into one of the openings 401 under the driving action of the connecting joint driving member 602. When the water outlet of the first heat exchanger 1 and the water inlet of the second heat exchanger 2 enter the upper and lower ends of the water circulation coil 4 respectively, since the interior of the connecting joint 603 is divided into two chambers and connected to the first heat exchanger 1 and the second heat exchanger 2 respectively, the connecting joint 603 can divide the water circulation coil 4 into upper and lower sections at the corresponding openings 401, and then respectively connect to the water inlet of the first heat exchanger 1 and the water outlet of the second heat exchanger 2 through the connecting joint 603, thereby forming the first water cycle and the second water cycle.

[0063] The longitudinal drive member 601 can drive the upper and lower positions of the connection joint 603, and can also control the position of the opening 401 to which the connection joint 603 is connected. When the opening 401 to which the connection joint 603 is connected is closer to the bottom, the number of turns of the upper water circulation coil 402 corresponding to the first water cycle is more, and the number of turns of the lower water circulation coil corresponding to the second water cycle is less. The more turns, the longer the flow time of the heat exchange medium in the coil, and the longer the contact time between the energy storage tank 3 and the heat exchange medium. At this time, it is suitable for the corresponding heat exchanger to obtain more energy and thus the output heat exchange medium temperature is higher, such as the heat energy obtained from the air in summer. In this case, the heat exchange medium can be fully contacted with the energy storage tank 3 to complete more heat exchange. For the case where the heat exchanger obtains less energy and the output heat exchange medium temperature is lower, such as the heat energy obtained from groundwater in summer, the number of turns of the coil connected to the corresponding heat exchanger can be reduced.

[0064] In this embodiment, the structures of the water circulation coil 4 and the water circulation stroke regulating device 6 cooperate with each other, and the connection method of the water circulation stroke regulating device 6 with the first heat exchanger 1 and the second heat exchanger 2 can be used to adjust the number of connection circles between the first heat exchanger 1 and the water circulation coil 4, and the number of connection circles between the second heat exchanger 2 and the water circulation coil 4 respectively. According to the temperature of the heat exchange medium output by the first heat exchanger 1 and the second heat exchanger 2, the number of circles of the corresponding upper water circulation coil 402 or lower water circulation coil 403 is increased or decreased, so that the heat exchange medium with a high temperature obtains more circles of the coil and the heat exchange medium with a low temperature obtains fewer circles of the coil, thereby increasing the contact time between the heat exchange medium with a high temperature and the energy storage tank 3, so that it can fully complete the heat exchange, and reducing the contact time between the heat exchange medium with a low temperature and the energy storage tank 3, so that it can quickly return to the external low-temperature heat source to reabsorb heat.

[0065] Furthermore, the top end of the water circulation coil 4 is connected to the water outlet of the first heat exchanger 1, and the bottom end of the water circulation coil 4 is connected to the water inlet of the second heat exchanger 2;

[0066] One end of the connection joint 603 leads to a first connection port 6031 and a second connection port 6032 according to the two chambers, wherein the first connection port 6031 is connected to the water inlet of the first heat exchanger 1 , and the second connection port 6032 is connected to the water outlet of the second heat exchanger 2 .

[0067] In this embodiment, this structure allows the isolated first connection port 6031 and the isolated second connection port 6032 to be connected to two heat exchangers respectively, thereby forming two independent water circulation coils.

[0068] Furthermore, the longitudinal driving member 601 is a screw assembly, and the screw assembly is arranged on one side of the energy storage tank 3 , and the driving direction of the screw assembly is parallel to the axial direction of the energy storage tank 3 .

[0069] Furthermore, the interior of the connection joint 603 is divided into two chambers by a partition plate 6033 , and the connection joint 603 is provided with water guide ports 6034 corresponding to the two chambers at one end close to the water circulation coil 4 .

[0070] Furthermore, the first heat exchanger 1 and the second heat exchanger 2 are respectively one or more of a solar water source heat pump, an air source heat pump, a ground source heat pump, an industrial wastewater source heat pump, and a groundwater source heat pump.

[0071] Furthermore, the blocking mechanism 5 includes a plug 501 , and the water circulation coil 4 is provided with an elastic member 502 at the opening 401 . The elastic member 502 is connected to the plug 501 , and the elastic member 502 enables the plug 501 to have a movement tendency to move toward the opening 401 .

[0072] Furthermore, the water circulation coil is provided with an elastic member accommodating cavity 503 at a position opposite to the opening 401 , and one end of the elastic member 502 is fixedly connected to the elastic member accommodating cavity 503 .

[0073] In this embodiment, the elastic member 502 may be a spring, and the plug 501 is supported to the position of the opening 401 by the spring, so that the opening 401 can be blocked when the connection joint 603 is not inserted into the opening 401, so that the liquid in the water circulation coil 4 will not leak. At the same time, the elastic member accommodating cavity 503 can provide space for the elastic member 502 to retreat when the connection joint 603 is inserted into the opening 401.

[0074] Furthermore, it comprises a flash tank 7, which is connected to the energy storage tank 3 and is used to generate steam, and an electric heating device is arranged in the flash tank 7.

[0075] The flash tank 7 is a direct adoption of the prior art, and the electric heating device can be an electric heating wire. The flash tank 7 can change the pressure of the hot water output by the energy storage tank 3, so that the hot water can be more easily converted into steam. At the same time, the electric heating device in the flash tank 7 can further heat the hot water when the heat energy output by the heat pump cannot make the hot water in the energy storage tank 3 reach the corresponding temperature, so that the hot water is heated to form steam.

[0076] Furthermore, an end of the connection joint 603 facing the opening 401 is covered with a sealing sleeve (not shown) on its outer wall.

[0077] The sealing sleeve can form a sealing structure at the connection point when the connecting joint 603 is inserted into the opening 401, thereby preventing the liquid in the water circulation coil 4 from leaking.

[0078] Further, temperature sensors are respectively arranged at the water outlets of the first heat exchanger 1 and the second heat exchanger 2;

[0079] The safety protection method comprises the following steps:

[0080] S1, calculating the temperature change rate of the heat exchange medium passing through the water circulation coil 4;

[0081] In this step, the temperature change rate refers to the temperature change amount generated after the heat exchange medium passes through the water circulation coil 4 per unit time, or refers to the temperature change amount generated after the heat exchange medium passes through the water circulation coil 4 per unit stroke. For each circle of the water circulation coil 4 of this embodiment, an opening 401 is provided, which can be quantified as the temperature difference at adjacent openings 401.

[0082] S2, obtaining data from the temperature sensor, and calculating predicted outlet temperatures of the first heat exchanger 1 and the second heat exchanger 2 after a first time period according to the data from the temperature sensor;

[0083] The heat exchange medium of the heat exchanger is output from the water outlet, and it takes a long time for it to pass through the water outlet again after a complete cycle. In the case of a sudden temperature change, such as when it rains, the temperature of the environment in which the air source heat pump is located drops sharply, and the heat exchange medium of the heat exchanger takes a long time to pass through a complete cycle, there will be a large delay in controlling and adjusting the temperature difference between the output temperature and the reflux temperature of the heat exchange medium of the heat exchanger.

[0084] Therefore, this step calculates or predicts the temperature of the two heat exchangers after a period of time by measuring the water outlet temperature of the two heat exchangers based on the actual temperature sensor. The predicted water outlet temperature can be used to execute in advance the control strategy corresponding to the change in the output temperature of the heat exchanger after the first time period, thereby reducing or avoiding the delay of the control strategy and preventing safety hazards caused by sudden changes in the external environment. For example, when the outside temperature is about to fall below 5°C, if the air source heat exchanger continues to work at a high intensity, it is easy to frost on the evaporator end of the air source heat exchanger. At this time, it is predicted in advance that the outside weather may be below 5°C, so the heat intake of the heat exchanger can be reduced in advance, so that the heat exchange medium still has a certain temperature when it returns to the evaporator end of the air source heat exchanger, so as not to frost on the evaporator.

[0085] S3, under the condition of predicted water outlet temperature, with the water inlet temperatures of the first heat exchanger 1 and the second heat exchanger 2 being the same as a constraint, the number of turns of the water supply circulation coil 402 is calculated according to the temperature change rate;

[0086] In this step, when the predicted water outlet temperature is predicted, the system considers that the temperature output by the first heat exchanger 1 and the second heat exchanger 2 is the predicted water outlet temperature, and starts to calculate the number of turns of the upper water circulation coil 402. Specifically, by adjusting the number of turns of the upper water circulation coil 402, the output temperature of the upper water circulation coil 402 and the lower water circulation coil 403 are made the same. At this time, the heat exchange efficiency of the heat exchange medium of the two heat exchangers tends to be balanced, and the energy obtained by the energy storage tank 3 from the two makes the temperature of the heat exchange medium of the two return to the evaporator end of the heat exchanger tend to be close, and there will be no phenomenon of overheating or overcooling of one of the heat exchangers. The same temperature of the water inlet of the first heat exchanger 1 and the second heat exchanger 2 in this step means that the difference in the water inlet temperature of the two is less than 1°C.

[0087] S4, controlling the longitudinal drive member 601 to drive the connection joint 603 to the position of the corresponding opening 401 according to the number of turns of the water circulation coil 402;

[0088] As described above, the more turns of the water circulation coil 402, the longer the heat exchange medium flows through the coil, and the longer the contact time between the energy storage tank 3 and the heat exchange medium. Through this adjustment, the heat exchanger with a higher temperature of the external environment and a higher heat output temperature of the heat exchange medium can obtain more turns of the coil, so that more heat can be absorbed by the energy storage tank 3. Through this method, the output of the two heat exchangers is balanced.

[0089] S5 , controlling the connection joint driving member 602 to drive the connection joint 603 to connect to the corresponding opening 401 .

[0090] Furthermore, step S1 is specifically as follows:

[0091] The temperature change ΔT of the heat exchange medium passing through the water circulation coil 4 and the number of turns N of the water circulation coil 4 are obtained, and the temperature change rate S=ΔT / N is calculated.

[0092] In this embodiment, the number of turns N of the water circulation coil 4 can be pre-stored in the system. The temperature change ΔT can be obtained by connecting the heat exchange medium output end of a heat exchanger to the top of the water circulation coil 4 and the heat exchange medium input end to the bottom of the water circulation coil 4, thereby measuring and calculating the temperature difference between the upper and lower ends of the water circulation coil 4.

[0093] Further, in step S2, the first time period is the time required for the heat exchange medium in the corresponding heat exchanger to circulate once.

[0094] The time required for the heat exchange medium to be output from the output end of the heat exchanger and to return to the output end in the first time period. The heat exchanger is generally set on the rooftop, underground or outside the factory, etc., and is far away from the energy storage tank 3. It may take 15 minutes to complete a complete cycle. It can be calculated based on parameters such as the length of the heat exchange medium circulation path of the heat exchanger and the flow rate of the water pump.

[0095] Further, in step S2, respectively calculating the predicted water outlet temperatures of the first heat exchanger 1 and the second heat exchanger 2 after a first time period according to the data of the temperature sensor includes:

[0096] Obtaining the temperature of the environment where the corresponding heat exchanger is located after a first time period;

[0097] The relationship between the ambient temperature and the heating rate of the corresponding heat exchanger is obtained, and the predicted outlet temperatures of the first heat exchanger 1 and the second heat exchanger 2 after the first time period are calculated according to the temperature of the environment after the first time period.

[0098] In this step, the relationship between the ambient temperature and the heating rate of the corresponding heat exchanger can be measured and calculated based on the specific performance parameters of the heat exchanger, or can be referred to the summary in the prior art. For example, the "Analysis of the Operation Characteristics of Air Source Heat Water Heaters in Hot Summer and Cold Winter Regions" published by the University of South China reveals the relationship between ambient temperature and heating capacity, such as Figure 7 As shown, according to the curve diagram, the relationship between the ambient temperature and the heating rate of the corresponding heat exchanger can be obtained, and then the predicted water outlet temperature can be calculated based on the relationship.

[0099] Further, if the heat exchanger is an air source heat exchanger, the temperature of the environment after the first time period is obtained according to the weather forecast data;

[0100] If the heat exchanger is a ground source heat exchanger, an underground temperature prediction model is generated by a target learning algorithm, and the temperature of the environment after a first time period is calculated by the underground temperature prediction model;

[0101] If the heat exchanger is an industrial wastewater source heat exchanger, the temperature of the environment after the first time period is calculated by obtaining the industrial wastewater discharge time, discharge volume, and discharge temperature.

[0102] In this embodiment, since the heat exchanger is a multi-source heat exchanger and the number is more than one, the environment where the heat exchanger is located is different and complex, and it is necessary to obtain the temperature of the environment after the first time period respectively.

[0103] For the air source heat exchanger, its external environment is air, and its temperature can be roughly obtained through weather forecast data.

[0104] For ground source heat exchangers, their external environment is land or groundwater, etc. The environment in which they are located is relatively complex and is related to environmental variables such as geographical location, weather changes, and depth. At this time, through the learning algorithm, with environmental variables and underground temperature as input, after obtaining the correlation between the two, the underground temperature can be inferred based on the environmental variables.

[0105] For industrial wastewater source heat exchangers, their external environment is industrial wastewater, such as hotel swimming pools, laundry sewage, factory wastewater, etc. The discharge of industrial wastewater has a certain pattern. For example, a hotel swimming pool discharges swimming pool wastewater at a certain time point every three days, or a laundry room or factory completes work and discharges sewage at a certain interval. By obtaining the industrial wastewater discharge time, discharge volume, and discharge temperature, the water temperature of the wastewater pool at this time can be calculated.

[0106] Furthermore, the underground temperature prediction model is generated by:

[0107] Collect underground temperature data of different geographical locations, climates, geology, underground depths, and surface temperatures to construct underground temperature training samples;

[0108] A prediction model is constructed using a neural network model, and data samples of different geographical locations, climates, geology, underground depths, and surface temperature are used as inputs of the prediction model, and underground temperature data samples are used as outputs of the prediction model. The prediction model is trained to obtain an underground temperature prediction model.

[0109] The reasons why various factors affect underground temperature are as follows:

[0110] Geographic location: The intensity and duration of solar radiation vary in different latitudes, affecting both surface and underground temperatures. As altitude increases, air temperatures generally decrease, which can affect the initial temperature of groundwater.

[0111] Climate conditions: Surface and soil temperatures change with air temperature, which affects groundwater temperature, especially in shallow groundwater. When precipitation infiltrates the ground, it may bring water bodies of different temperatures, which will affect groundwater temperature. Higher evaporation rates will cause the surface to cool, which will affect groundwater temperature.

[0112] Geological conditions: The thermal conductivity of rocks and soils determines the efficiency of energy transfer underground, affecting the speed at which heat is transferred from the surface downward. It affects the flow rate of water and thus the diffusion of heat in groundwater.

[0113] Underground depth: Temperature and depth tend to change in a regular pattern. Deep groundwater is less susceptible to surface temperature fluctuations, while shallow groundwater is more susceptible.

[0114] Ground surface temperature: Seasonal changes and temperature differences between day and night affect groundwater temperature within a few meters of the ground surface through heat conduction.

[0115] Furthermore, step S3 is specifically as follows:

[0116] Define M as the number of turns of the water circulation coil 402, A as the predicted outlet temperature of the first heat exchanger 1, and B as the predicted outlet temperature of the second heat exchanger 2. After calculating M, M is rounded to an integer to obtain the number of turns of the water supply circulation coil 402.

[0117] In this embodiment, M is the number of turns of the upper water circulation coil 402, N is the total number of turns of the water circulation coil 4, and NM is the number of turns of the lower water circulation coil 403. The temperature change rate S*number of turns is the temperature change of the heat exchange medium after passing through the corresponding number of turns of the water circulation coil 4. By making the output temperatures of the two heat exchange media the same and calculating the corresponding number of turns, it is possible to know the position of the corresponding opening 401 to which the longitudinal drive member 601 needs to drive the connecting joint 603.

[0118] Meanwhile, M may be rounded off.

[0119] A high-temperature heat pump device is further provided, which implements the high-temperature heat pump system safety protection method during operation.

[0120] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0121] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0122] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0123] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0124] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A high-temperature heat pump system safety protection method, characterized in that: The high temperature heat pump system comprises: A first heat exchanger (1) and a second heat exchanger (2); Energy storage tank (3); A water circulation coil (4), the water circulation coil (4) being arranged on the outer wall of the energy storage tank (3), each circle of the water circulation coil (4) being provided with an opening (401), the opening (401) being closed by a blocking mechanism (5), and all the openings (401) being arranged longitudinally; The water circulation stroke regulating device (6) comprises a longitudinal driving member (601), a connecting joint (603), and a connecting joint driving member (602), wherein the connecting joint driving member (602) drives the connecting joint (603) to move toward one of the openings (401), the connecting joint (603) is internally divided into two chambers and respectively connected to the first heat exchanger (1) and the second heat exchanger (2), and after the connecting joint (603) is connected to one of the openings (401), the connecting joint (603) separates the water circulation coil (4) to form an upper water circulation coil (402). ) and a lower water circulation coil (403), the water outlet of the first heat exchanger (1), the upper water circulation coil (402), the connecting joint (603), and the water inlet of the first heat exchanger (1) form a first water circulation, the water outlet of the second heat exchanger (2), the connecting joint (603), the lower water circulation coil (403), and the water inlet of the second heat exchanger (2) form a second water circulation, and the longitudinal driving member (601) drives the connecting joint driving member (602) to move up and down, thereby adjusting the number of turns of the upper water circulation coil (402) or the lower water circulation coil (403); Temperature sensors are respectively arranged at the water outlets of the first heat exchanger (1) and the second heat exchanger (2); The safety protection method comprises the following steps: S1, calculating the temperature change rate of the heat exchange medium passing through the water circulation coil (4); S2, acquiring data from the temperature sensor, and calculating predicted water outlet temperatures of the first heat exchanger (1) and the second heat exchanger (2) after a first time period according to the data from the temperature sensor; S3, under the condition of predicted water outlet temperature, with the water inlet temperatures of the first heat exchanger (1) and the second heat exchanger (2) being the same as a constraint, calculating the number of turns of the water supply circulation coil (402) according to the temperature change rate; S4, controlling the longitudinal drive member (601) to drive the connection joint (603) to reach the position of the corresponding opening (401) according to the number of turns of the water circulation coil (402); S5, controlling the connection joint driving member (602) to drive the connection joint (603) to connect to the corresponding opening (401).

2. A high temperature heat pump system safety protection method according to claim 1, characterized in that: Step S1 is specifically as follows: The temperature change ΔT of the heat exchange medium passing through the water circulation coil (4) and the number of turns N of the water circulation coil (4) are obtained, and the temperature change rate S=ΔT / N is calculated.

3. A high temperature heat pump system safety protection method according to claim 1, characterized in that: In step S2, the first time period is the time required for the heat exchange medium in the corresponding heat exchanger to circulate once.

4. A high temperature heat pump system safety protection method according to claim 3, characterized in that: In step S2, respectively calculating the predicted water outlet temperatures of the first heat exchanger (1) and the second heat exchanger (2) after a first time period based on the data of the temperature sensor includes: Obtaining the temperature of the environment where the corresponding heat exchanger is located after a first time period; The relationship between the ambient temperature and the heating rate of the corresponding heat exchanger is obtained, and the predicted water outlet temperatures of the first heat exchanger (1) and the second heat exchanger (2) after the first time period are calculated based on the temperature of the ambient environment after the first time period.

5. A high temperature heat pump system safety protection method according to claim 4, characterized in that: If the heat exchanger is an air source heat exchanger, the temperature of the environment after the first time period is obtained according to the weather forecast data; If the heat exchanger is a ground source heat exchanger, an underground temperature prediction model is generated by a target learning algorithm, and the temperature of the environment after a first time period is calculated by the underground temperature prediction model; If the heat exchanger is an industrial wastewater source heat exchanger, the temperature of the environment after the first time period is calculated by obtaining the industrial wastewater discharge time, discharge volume, and discharge temperature.

6. A high temperature heat pump system safety protection method according to claim 5, characterized in that: The method for generating the underground temperature prediction model is: Collect underground temperature data of different geographical locations, climates, geology, underground depths, and surface temperatures to construct underground temperature training samples; A prediction model is constructed using a neural network model, and data samples of different geographical locations, climates, geology, underground depths, and surface temperature are used as inputs of the prediction model, and underground temperature data samples are used as outputs of the prediction model. The prediction model is trained to obtain an underground temperature prediction model.

7. A high temperature heat pump system safety protection method according to claim 2, characterized in that: Step S3 is specifically as follows: Define M as the number of turns of the water circulation coil (402), A as the predicted water outlet temperature of the first heat exchanger (1), and B as the predicted water outlet temperature of the second heat exchanger (2). After calculating M, M is rounded to an integer to obtain the number of turns of the water circulation coil (402).

8. A high temperature heat pump system safety protection method according to claim 1, characterized in that: The interior of the connection joint (603) is divided into two chambers by a partition plate (6033), and the connection joint (603) is provided with water guide ports (6034) corresponding to the two chambers at one end close to the water circulation coil (4).

9. A high temperature heat pump system safety protection method according to claim 1, characterized in that: The blocking mechanism (5) comprises a plug (501), and the water circulation coil (4) is provided with an elastic member (502) at the opening (401), the elastic member (502) being connected to the plug (501), and the elastic member (502) causing the plug (501) to have a movement tendency to move towards the opening (401).

10. A high temperature heat pump device, characterized in that: During operation, a high-temperature heat pump system safety protection method as described in any one of claims 1 to 9 is implemented.

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