WO2020233112A1 - Heat source tower system - Google Patents

Abstract

A heat source tower system, relating to the technical field of air conditioning, and aiming to solve the problem of the low defrosting efficiency of existing heat source tower systems. The heat source system comprises a heat exchange loop and a defrosting loop, the heat exchange loop comprising a heat source tower (11), the heat source tower (11) being cyclically connected to an externally connected heat exchange mechanism; the defrosting loop comprises a buffer mechanism (21), a water pump (22), a heating mechanism (23), and the heat source tower (11) connected in sequence from head to tail; when the heat source tower system is in a defrosting mode, the water pump (22) makes a first refrigerant in the defrosting loop circulate, the buffer mechanism (21) buffers the pressure of the first refrigerant, and the heating mechanism (23) heats the first refrigerant, so that the heat source tower (11) is thereby defrosted using a heating method. The heating efficiency of the first refrigerant in the defrosting loop is increased by means of the heating mechanism (23) heating the first refrigerant circulating in the defrosting loop, thus increasing the defrosting efficiency of the heat source tower (11).

Description

Heat source tower system Technical field

The invention relates to the technical field of air conditioners, and specifically provides a heat source tower system.

Background technique

As a kind of heat exchange equipment, the heat source tower works as follows: absorb heat from low-temperature air in winter to provide a low-temperature heat source for the heat pump host; use water evaporation to dissipate heat in summer to discharge heat into the air for cooling. In the heating mode, the heat source tower directly collects low-grade outdoor heat, and uses a carrier medium (antifreeze) with a freezing point below 0°C to extract energy from low-temperature air with high relative humidity for heating, providing stability for the heat pump air conditioning system Source of heat. However, frosting may also occur during the operation of the heat source tower. The frosting of the heat source tower will reduce the performance of the refrigeration system, thereby affecting the heating effect of the heat pump air conditioning system, reducing the comfort of the indoor environment, and affecting user experience. Therefore, when the heat pump air conditioning system is in heating mode, it is necessary to defrost the heat source tower in time and effectively.

In order to solve the above problems, in the prior art, the heat source tower includes a heating mechanism, a connecting pipe, and a heat exchanger. The heating mechanism is connected to the heat exchanger through the connecting pipe. When the heat exchanger is frosted, the heat is exchanged through the heating mechanism. The refrigerant in the device is heated to remove the frost on the heat exchange wall by heating. However, the heating mechanism is in one-way communication with the heat exchanger through the connecting pipe, which results in uneven heating of the refrigerant in the heat exchanger. It is not possible to heat all the refrigerant in the heat exchanger to the preset temperature threshold in a short time, so The frost on the heat exchanger is removed in a short time, which reduces the defrosting efficiency, thus affecting the user experience.

Therefore, the art needs a new heat source tower system to solve the above problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of low defrosting efficiency of the existing heat source tower system, the present invention provides a heat source tower system, which includes a heat exchange circuit and a defrost circuit; The heat exchange circuit includes a heat source tower, which is cyclically connected to an external heat exchange mechanism; the defrosting circuit includes a buffer mechanism, a conveying mechanism, a heating mechanism, and a heat source tower, which are connected end to end. The conveying mechanism, buffer mechanism and heating mechanism are set as follows: When the heat source tower system is in the defrosting mode, the conveying mechanism circulates the first refrigerant in the defrosting circuit, the buffer mechanism buffers the pressure of the first refrigerant, and the heating mechanism heats the first refrigerant to heat the heat source tower. Defrost.

In the preferred technical solution of the above heat source tower system, the heating mechanism includes a heat exchanger, which is connected between the outlet end of the conveying mechanism and the inlet end of the heat source tower to exchange the first refrigerant in the defrosting circuit The second refrigerant in the heat exchanger exchanges heat.

In the preferred technical solution of the above heat source tower system, the heat exchanger includes: a shell, the inside of the shell forms a heat exchange chamber; a first heat exchange pipeline, the first heat exchange pipeline is arranged in the heat exchange chamber, and transport The outlet end of the mechanism is connected to the inlet end of the heat source tower through the first heat exchange pipeline; the second heat exchange pipeline, the second heat exchange pipeline is arranged in the heat exchange chamber, and the second heat exchange pipeline is cyclically connected to the external heat source .

In the preferred technical solution of the above heat source tower system, the heat exchanger further includes a first electric valve and a first target flow switch, and the first electric valve is connected between the outlet end of the external heat source and the inlet end of the second heat exchange pipeline The first target flow switch is connected between the outlet end of the second heat exchange pipeline and the inlet end of the external heat source, and the first target flow switch is used to detect whether the heat exchanger can operate normally.

In the preferred technical solution of the above heat source tower system, the heating mechanism further includes a heater connected between the outlet end of the first heat exchange pipeline and the inlet end of the heat source tower for heating the first refrigerant.

In the preferred technical solution of the heat source tower system described above, the buffer mechanism includes a buffer tank connected between the inlet end of the conveying mechanism and the outlet end of the heat source tower for buffering the pressure of the first refrigerant.

In the preferred technical solution of the above heat source tower system, the buffer mechanism further includes a bypass pipeline, and the bypass pipeline and the buffer tank are connected in parallel.

In the preferred technical solution of the above heat source tower system, the buffer tank is further equipped with a second electric valve, and the second electric valve is used to selectively open or close the buffer tank according to the pressure of the first refrigerant.

In the preferred technical solution of the above heat source tower system, the defrosting circuit further includes a second target flow switch connected between the inlet end of the buffer mechanism and the outlet end of the heat source tower for detecting whether the defrosting circuit is It can operate normally; and/or the heat source tower includes a shell, a heat exchanger and a fan arranged in the shell, and the fan is used to provide heat exchange airflow for the heat exchanger.

In the preferred technical solution of the above heat source tower system, the heat source tower further includes a detection component arranged on the shell, and the detection component is used to detect whether the heat exchanger is frosted.

Those skilled in the art can understand that in the preferred technical solution of the heat source tower system of the present invention, the heat source tower system includes a heat exchange circuit and a defrost circuit, wherein the defrost circuit includes a buffer mechanism and a conveying mechanism that are connected end to end in sequence. , Heating mechanism and heat source tower. Compared with the existing technical solution in which the heating mechanism communicates with the heat exchanger through a connecting pipe, when the heat source tower system of the present invention is in the defrosting mode, the conveying mechanism can circulate the first refrigerant in the defrosting circuit, and the heating mechanism can Heating the first refrigerant in the defrost circuit improves the heating efficiency of the first refrigerant in the defrost circuit, and can heat all the first refrigerant in the defrost circuit to the preset temperature threshold in a short time Therefore, the frost on the heat source tower can be removed in a short time, the defrosting efficiency of the heat source tower is improved, and the user experience is improved. At the same time, the buffer mechanism can buffer the pressure of the first refrigerant in the defrosting circuit, so that the pressure of the first refrigerant in the defrosting circuit is stabilized within the preset pressure threshold range, and avoiding the first refrigerant in the defrosting circuit The pressure is too high, thereby avoiding the bursting of the connecting pipe due to the excessive pressure of the first refrigerant, avoiding safety accidents, and improving the safety performance of the heat source tower system.

Further, the buffer mechanism includes a buffer tank and a bypass pipeline. The buffer tank is connected between the inlet end of the conveying mechanism and the outlet end of the heat source tower, and is used to buffer the first refrigerant to stabilize the pressure of the first refrigerant. It is also equipped with a second electric valve, which is used to selectively open or close the buffer tank according to the pressure of the first refrigerant. The bypass pipeline and the buffer tank are connected in parallel. When the pressure of the first refrigerant is greater than or equal to the preset When the pressure threshold is set, it means that the pressure of the first refrigerant in the defrosting circuit is too high and there is a safety hazard. Open the second electric valve so that the first refrigerant flowing from the heat source tower flows into the buffer tank for buffering, so as to reduce the first refrigerant. The pressure of the refrigerant; when the pressure of the first refrigerant is less than the preset pressure threshold, it means that the pressure of the first refrigerant in the defrosting circuit is low, there is no safety hazard, and there is no need to buffer the pressure of the first refrigerant, turn off the second electric The valve makes the first refrigerant flowing out of the heat source tower flow to the conveying mechanism through the bypass pipeline.

Further, the heating mechanism includes a heat exchanger and an electric heater. When the heat source tower system is in the defrost mode, the heat exchanger is used to exchange heat between the first refrigerant in the defrosting circuit and the second refrigerant in the heat exchanger, The electric heater is used to heat the first refrigerant. Under the combined action of the heat exchanger and the heater, the heating efficiency of the first refrigerant in the defrosting circuit is further improved, and the defrosting circuit can be heated in a short time. The first refrigerant is heated to the preset temperature threshold, so that the frost on the heat source tower can be removed in a short time, and the defrosting efficiency of the heat source tower is improved. Of course, it is also possible to select the heat exchanger to heat the first refrigerant in the defrosting circuit, or select the electric heater to heat the first refrigerant in the defrosting circuit, so that users can flexibly choose the heating method, and therefore improve user experience.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the heat source tower system of the present invention;

Figure 2 is a flowchart of the defrost control method of the present invention;

Fig. 3 is a flowchart of a defrost control method according to an embodiment of the present invention.

Among them, 11, heat source tower; 12, fourth electric valve; 13, sixth control valve; 14, seventh control valve; 21, buffer mechanism; 211, buffer tank; 212, bypass pipeline; 213, second electric Valve; 214, first control valve; 215, second control valve; 216, third control valve; 22, water pump, 23, heating mechanism, 231, heat exchanger, 2311, shell, 2312, first heat exchange tube 2313, the second heat exchange pipeline; 2314, the first electric valve; 2315, the first target flow switch; 232, the electric heater; 24, the second target flow switch; 25, the third electric valve; 26, the first Four control valves; 27, the fifth control valve.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

It should be noted that in the description of the present invention, the term "inner" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for ease of description, rather than indicating or implying. The device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it may be a fixed connection or It is a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.

Based on the technical problems raised in the background art, the present invention provides a heat source tower system, which aims to increase the heating of the first refrigerant in the defrost circuit by heating the first refrigerant in the defrost circuit through a heating mechanism Efficiency, it can heat all the first refrigerant in the defrosting circuit to the preset temperature threshold in a short time, so that the frost on the heat source tower can be removed in a short time, which improves the defrosting efficiency of the heat source tower , Thereby improving the user experience.

Referring to Figures 1 to 3, Figure 1 is a schematic structural diagram of the heat source tower system of the present invention; Figure 2 is a flow chart of the defrost control method of the present invention; Figure 3 is an embodiment of the defrost control method of the present invention flow chart. As shown in Figure 1, the heat source tower system includes a heat exchange circuit and a defrost circuit. The heat exchange circuit includes a heat source tower 11, which is cyclically connected to an external heat exchange mechanism; the defrost circuit includes a buffer mechanism 21, The water pump 22, the heating mechanism 23 and the heat source tower 11, when the heat source tower 11 system is in the defrost mode, the water pump 22 circulates the first refrigerant in the defrosting circuit, the buffer mechanism 21 buffers the pressure of the first refrigerant, and the heating mechanism 23 The first refrigerant is heated to defrost the heat source tower 11 by heating. Those skilled in the art can imagine that the water pump 22 is not limited to the above-mentioned water pump 22, but may also be a circulating pump, a centrifugal pump, etc., no matter what kind of water pump 22 is used, as long as the first refrigerant in the defrosting circuit can be circulated. can.

In a preferred embodiment, as shown in FIG. 1, the heating mechanism 23 includes a heat exchanger 231 and an electric heater 232. The heat exchanger 231 and the electric heater 232 are connected in series at the outlet end of the water pump 22 and the heat source tower 11. When the heat source tower 11 system is in the defrost mode, the heat exchanger 231 is used to exchange heat between the first refrigerant in the defrosting circuit and the second refrigerant in the heat exchanger 231, and the electric heater 232 It is used to heat the first refrigerant. Under the joint action of the heat exchanger 231 and the heater, the heating efficiency of the first refrigerant in the defrosting circuit is further improved, and the defrosting circuit can be heated in a short time. The first refrigerant is all heated to the preset temperature threshold, so that the frost on the heat source tower 11 can be removed in a short time, and the defrosting efficiency of the heat source tower 11 is improved. Of course, the heater is not limited to the electric heater 232 listed above, but may also be a photovoltaic heater, a gas fuel heater, etc., no matter what kind of heater is used, as long as it can heat the first refrigerant circulating in the defrosting circuit. can.

In actual use, the heat exchanger 231 and the electric heater 232 can not only be used at the same time, but also can be used separately. For example, only the heat exchanger 231 is activated and the electric heater 232 is not activated, and the defrosting circuit is controlled by the heat exchanger 231. Heating of the refrigerant inside; or only the electric heater 232 is activated, and the heat exchanger 231 is not activated. The electric heater 232 heats the first refrigerant in the defrosting circuit, which is convenient for the user to select the heating method flexibly, and thus improves user experience. In addition, those skilled in the art can imagine that the heating mechanism 23 may also include only the heat exchanger 231 or the electric heater 232, and the refrigerant in the defrosting circuit is heated by the heat exchanger 231, or the electric heater 232 is used for heating the refrigerant in the defrosting circuit. The heating of the first refrigerant in the defrosting circuit does not deviate from the principle of the present invention.

Preferably, the heat exchanger 231 includes a housing 2311, a first heat exchange pipe 2312, and a second heat exchange pipe 2313. The inside of the housing 2311 forms a heat exchange chamber, and the first heat exchange pipe 2312 is arranged in the heat exchange In the chamber, the outlet end of the conveying mechanism is connected to the inlet end of the heat source tower 11 through the first heat exchange pipe 2312, the second heat exchange pipe 2313 is arranged in the heat exchange chamber, and the second heat exchange pipe 2313 and the external heat source circulate connection. When the heat source tower 11 system is in the defrosting mode, when the heat exchanger 231 is used to heat the first refrigerant in the defrosting circuit, the first refrigerant flowing out of the water pump 22 in the defrosting circuit through the first heat exchange pipeline 2312 is transported to the heat In the exchange chamber, the second refrigerant flowing out of the external heat source is transported to the heat exchange chamber through the second heat exchange pipe 2313, so that the first refrigerant and the second refrigerant pass through the first heat exchange pipe 2312 and The second heat exchange pipeline 2313 performs heat exchange in the manner of heat convection and heat conduction, which improves the heating efficiency of the first refrigerant, thereby improving the defrosting efficiency of the heat source tower 11 and improving the user experience.

In order to further improve the heat exchange efficiency, the first heat exchange pipe 2312 is a serpentine pipe, and the second heat exchange pipe 2313 is a serpentine pipe. The serpentine pipe structure is adopted to extend the length of the first heat exchange pipe 2312 and the second heat exchange pipe. The length of the heat exchange pipeline 2313 increases the heat exchange area of the heat exchanger 231, prolongs the residence time of the first refrigerant in the heat exchange chamber and the residence time of the second refrigerant in the heat exchange chamber, thereby increasing The heat exchange efficiency between the first refrigerant and the second refrigerant is improved, and the defrosting efficiency of the heat source tower 11 system is further improved. Of course, those skilled in the art can think of that, only the first heat exchange pipe 2312 or the second heat exchange pipe 2313 can be set as a serpentine tube, and the first heat exchange pipe 2312 or the second heat exchange pipe The path 2313 increases the heat exchange area of the heat exchanger 231, thereby improving the heat exchange efficiency between the first refrigerant and the second refrigerant. This change does not deviate from the principle of the present invention.

Preferably, the flow direction of the first refrigerant in the first heat exchange pipe 2312 is opposite to the flow direction of the second refrigerant in the second heat exchange pipe 2313, so that the first refrigerant and the second refrigerant pass through the first heat exchange pipe The path 2312 and the second heat exchange pipeline 2313 perform heat exchange in a countercurrent manner, and the heat exchange in a countercurrent manner further improves the heat exchange efficiency of the first refrigerant and the second refrigerant. Of course, the flow direction of the first refrigerant in the first heat exchange pipe 2312 and the flow direction of the second refrigerant in the second heat exchange pipe 2313 can also be the same, so that the first refrigerant and the second refrigerant pass through the first heat exchange The pipeline 2312 and the second heat exchange pipeline 2313 exchange heat in a parallel flow manner.

In addition, it should be further explained that the structure of the first heat exchange pipe 2312 and the second heat exchange pipe 2313 is not limited to the serpentine structure listed above, and the first heat exchange pipe 2312 and the second heat exchange pipe 2313 are also It can be a spiral structure, or a recirculation structure, etc., no matter what structure design is adopted for the first heat exchange pipeline 2312 and the second heat exchange pipeline 2313, as long as it can meet the requirements of increasing the heat exchange area of the heat exchanger 231 to increase the heat The requirements of exchange efficiency are sufficient.

In order to selectively turn on the heat exchanger 231, as shown in Figure 1, the heat exchanger 231 also includes a first electric valve 2314 and a first target flow switch 2315. The first electric valve 2314 is connected to the outlet end of the external heat source and the second Between the inlet ends of the heat exchange pipeline 2313, the first target flow switch 2315 is connected between the outlet end of the second heat exchange pipeline 2313 and the inlet end of the external heat source, and the first target flow switch 2315 is used to detect the heat exchanger Whether 231 can operate normally.

When the heat source tower 11 system is in the defrosting mode, and the heat exchanger 231 needs to be used to heat the first refrigerant in the defrosting circuit, the first electric valve 2314 is opened, so that the heat exchanger 231 and the external heat source are cyclically connected, and the first Whether the target flow switch 2315 is turned on, if the first target flow switch 2315 is turned on, indicating that the second condensation can flow normally between the heat exchanger 231 and the external heat source, it is determined that the heat exchanger 231 can operate normally; if the first target flow switch 2315 is closed, indicating that the second condensation is cut off between the heat exchanger 231 and the external heat source, it is determined that the heat exchanger 231 cannot operate normally; when it is determined that the heat exchanger 231 can operate normally, the heat exchanger 231 can be used to heat the defrost circuit The first refrigerant within. When the heat source tower 11 system is in the defrosting mode and the heat exchanger 231 is not needed to heat the first refrigerant in the defrosting circuit, the first electric valve 2314 is closed, so that the heat exchanger 231 is disconnected from the external heat source, thus shutting down The heat exchanger 231 makes it impossible for the first refrigerant in the defrosting circuit to exchange heat with the second refrigerant in the heat exchanger 231. Of course, those skilled in the art can imagine that the heat exchanger 231 may also only include the first electric valve 2314. The communication between the heat exchanger 231 and the external heat source can be realized by opening or closing the first electric valve 2314. This change It does not deviate from the principle of the present invention.

It should be further explained that the target switch is used to detect one-way or two-way flow of air, oil and water. When the fluid rushes to the blade, the blade swings, which changes the relative position of the magnet and the reed contactor and activates the contactor. Turn it on or off. Once the fluid is interrupted, the blade returns to the starting position, and the reed contactor is activated again. The mutual repulsion of the two magnets provides the force required for the reset of the flow switch, and the contactor returns to its previous state.

Preferably, the external heat source can be a hot water source, a steam source, or the like.

Preferably, the second refrigerant in the heat exchanger 231 is water or steam.

Preferably, the first refrigerant in the defrosting circuit is a refrigerant, such as an aqueous solution of sodium chloride or calcium chloride, or an organic solution such as ethylene glycol and glycerol.

In a preferred embodiment, as shown in FIG. 1, the buffer mechanism 21 includes a buffer tank 211 and a bypass pipe 212. The buffer tank 211 is connected between the inlet end of the water pump 22 and the outlet end of the heat source tower 11. For buffering the pressure of the first refrigerant, the buffer tank 211 is also equipped with a second electric valve 213, the second electric valve 213 is used to selectively open or close the buffer tank 211 according to the pressure of the first refrigerant, the bypass pipeline 212 and The buffer tanks 211 are connected in parallel. When the pressure of the first refrigerant in the defrosting circuit is greater than or equal to the preset pressure threshold, it means that the pressure of the first refrigerant in the defrosting circuit is too high, and there is a safety hazard. Then the second electric valve 213 is opened to make the heat source tower 11 The outflowing first refrigerant first flows into the buffer tank 211 for buffering, and then flows to the water pump 22; when the pressure of the first refrigerant in the defrosting circuit is less than the preset pressure threshold, it means that the pressure of the first refrigerant in the defrosting circuit is higher The second electric valve 213 is closed so that the first refrigerant flowing out of the heat source tower 11 flows directly to the water pump 22 through the bypass pipe 212 without the need to buffer the pressure of the first refrigerant.

Preferably, the second electric valve 213 may be an on-off electric valve or a regulating electric valve, and further, the second electric valve 213 is a pressure regulating valve.

Preferably, the bypass pipeline 212 is provided with a first control valve 214, the outlet end of the buffer tank 211 is provided with a second control valve 215, and the inlet end of the buffer tank 211 is provided with a third control valve 216, the first control valve 214 , The second control valve 215 and the third control valve 216 are in a long open state to facilitate maintenance and replacement of the bypass pipeline 212, the buffer tank 211 and the second electric valve 213.

Preferably, the first control valve 214, the second control valve 215, and the third control valve 216 are manual control valves, so as to manually switch the flow direction of the first refrigerant flowing out of the heat source tower 11.

In the above structure, through the setting of a preset pressure threshold, a conclusion is given whether to buffer the pressure of the first refrigerant in the defrosting circuit. Among them, the preset pressure threshold may be the highest pressure at which there is no safety hazard in the defrosting circuit. Of course, the preset pressure threshold is not limited to the pressures in the above examples, but can also be other pressures, such as the pressure obtained by those skilled in the art based on experiments under specific working conditions, or the empirical pressure obtained based on experience, as long as the preset pressure The boundary point determined by the pressure threshold can determine whether to buffer the pressure requirement of the first refrigerant in the defrosting circuit.

Of course, the structure of the buffer mechanism 21 is not limited to the structures listed above. The buffer mechanism 21 may also include a buffer tank 211, which is connected between the inlet end of the water pump 22 and the outlet end of the heat source tower 11, regardless of the defrosting circuit Whether the pressure of the first refrigerant is greater than or equal to the preset pressure threshold, the first refrigerant flowing out of the heat source tower 11 flows into the buffer tank 211 for buffering, ensuring that the pressure of the first refrigerant in the circulation loop is always less than the preset pressure threshold. The safety performance of the heat source tower 11 system is improved.

In addition, the buffer mechanism 21 may also include a buffer tank 211 and a bypass pipeline 212. The buffer tank 211 is connected between the inlet end of the water pump 22 and the outlet end of the heat source tower 11, and the bypass pipeline 212 and the buffer tank 211 are connected in parallel. No matter whether the pressure of the first refrigerant in the defrosting circuit is greater than or equal to the preset pressure threshold, a part of the first refrigerant flowing out of the heat source tower 11 first flows into the buffer tank 211 for buffering, and then flows to the water pump 22, from the heat source tower Another part of the first refrigerant flowing out of 11 flows directly to the water pump 22 through the bypass pipeline 212, ensuring that the pressure of the first refrigerant in the circulation loop is always less than the preset pressure threshold, and improving the safety performance of the heat source tower 11 system.

In a preferred embodiment, as shown in FIG. 1, the defrosting circuit further includes a second target flow switch 24, which is connected between the inlet end of the buffer mechanism 21 and the outlet end of the heat source tower 11. It is used to detect whether the defrost circuit can operate normally.

When the heat source tower 11 needs to be defrosted, the water pump 22 is turned on, and the first refrigerant in the defrosting circuit can be circulated under the action of the water pump 22. At this time, it is determined whether the second target flow switch 24 is turned on. 24 is open, indicating that the first refrigerant in the defrosting circuit can flow normally, then it is determined that the defrosting circuit can operate normally; if the second target flow switch 24 is closed, indicating that the first refrigerant in the defrosting circuit cannot flow normally, it is determined The defrost circuit cannot operate normally; when it is determined that the defrost circuit can operate normally, the heat source tower 11 can be defrosted.

In a preferred embodiment, the heat source tower 11 includes a shell, a heat exchanger (not shown in the figure) arranged in the shell, and a fan (not shown in the figure), which can draw air from the air inlet of the shell It is sucked into the shell, and the air sucked into the shell exchanges heat with the heat exchanger, thereby providing heat exchange air for the heat exchanger. Of course, the air flow is not limited to the air listed above, but may also be other air flows such as nitrogen, carbon dioxide gas, etc., and those skilled in the art can flexibly adjust and set the type of air flow in practical applications.

Preferably, the heat exchanger is a fin heat exchanger 231, and the heat exchanger may also be other heat exchangers 231 such as a shell-and-tube heat exchanger 231, a plate heat exchanger 231, a spray heat exchanger 231 and the like.

Preferably, the heat source tower 11 further includes a detection component provided on the housing, and the detection component is used to detect whether the heat exchanger is frosted.

Further, the detection component includes a wind pressure switch. When the wind pressure switch is turned on, it indicates that the heat exchanger has been frosted and the thickness of the frost is thick, and the heat exchanger needs to be defrosted; when the wind pressure switch is closed, it indicates that the heat exchanger If the frost has not formed or the thickness of the frost is thin, it is unnecessary to defrost the heat exchanger.

Further, the detection component includes a first temperature sensor, the first temperature sensor is used to detect the inlet temperature and the outlet temperature of the heat exchanger, when the difference between the inlet temperature and the outlet temperature is less than the first preset temperature difference threshold, the heat exchanger The heat exchanger has been frosted and the thickness is thick, and the heat exchanger needs to be defrosted; when the difference between the inlet temperature and the outlet temperature is greater than or equal to the first preset temperature difference threshold, it means that the heat exchanger is not yet frosted or the frost thickness is relatively thick. Thin, no need to defrost the heat exchanger.

Further, the detection component includes a second temperature sensor, the second temperature sensor is used to detect the outlet temperature of the heat exchanger and the ambient temperature, when the difference between the outlet temperature and the ambient temperature is greater than the second preset temperature difference threshold, the heat exchanger Frosting has formed and the thickness of frost is thick, the heat exchanger needs to be defrosted; when the difference between the outlet temperature and the ambient temperature is less than or equal to the second preset temperature difference threshold, it means that the heat exchanger is not yet frosted or the thickness of frost is relatively large. Thin, no need to defrost the heat exchanger.

In the above structure, by setting the first preset temperature difference threshold and the second preset temperature difference threshold, a conclusion is given whether the heat exchanger needs to be defrosted. Among them, the first preset temperature difference threshold is the maximum temperature difference for judging whether defrosting is required according to the temperature difference between the inlet temperature and the outlet temperature of the heat exchanger, and the second preset temperature difference threshold is the maximum temperature difference based on the outlet temperature of the heat exchanger and the ambient temperature. The minimum temperature difference to determine whether defrosting is required by the temperature difference. Of course, the first preset temperature difference threshold and the second preset temperature difference threshold are not limited to the temperature differences in the above examples, and may also be other temperature differences, such as those obtained by those skilled in the art based on experiments under specific working conditions, or based on experience. The experienced temperature difference can be adjusted and set flexibly by those skilled in the art.

Preferably, the number of heat source towers 11 can be one or more, and those skilled in the art can flexibly adjust and set the number of heat source towers 11. When the number of heat source towers 11 is multiple (for example, 3), multiple heat source towers 11 are connected in parallel, and all or at least part of the heat source towers 11 can be defrosted at the same time, or all heat source towers can be defrosted in sequence. 11 performs defrosting, and those skilled in the art can flexibly adjust and set the defrosting sequence of the heat source tower 11.

In a preferred embodiment, as shown in FIG. 1, the defrosting circuit further includes a third electric valve 25, a fourth control valve 26 and a fifth control valve 27, a third electric valve 25 and a fourth control valve 26 It is connected in series between the outlet end of the electric heater 232 and the inlet end of the heat source tower 11, and the fifth control valve 27 is connected between the second target flow switch 24 and the outlet end of the heat source tower 11.

Preferably, the heat exchange circuit further includes a fourth electric valve 12, a sixth control valve 13, and a seventh control valve 14. The fourth electric valve 12 and the sixth control valve 13 are connected in series at the outlet end of the external heat exchange mechanism and the heat source tower 11. The seventh control valve 14 is connected between the inlet end of the external heat exchange mechanism and the outlet end of the heat source tower 11.

When the heat source tower 11 system is in the defrosting mode, the fourth electric valve 12, the sixth control valve 13 and the seventh control valve 14 are closed, so that the heat source tower 11 is disconnected from the external heat exchange mechanism, thereby closing the heat exchange circuit and Open the third electric valve 25, the fourth control valve 26 and the fifth control valve 27, so that the heat source tower 11, the buffer mechanism 21, the water pump 22, the heat exchanger 231 and the electric heater 232 are circulated in communication, thereby opening the defrosting circuit, And turn on the water pump 22 to make the first refrigerant in the defrosting circuit circulate under the action of the water pump 22. At this time, the heat exchanger 231 and/or the electric heater 232 can perform the first refrigerant circulating in the defrosting circuit. Heating can heat all the first refrigerant in the defrosting circuit to the preset temperature threshold in a short time, so that the frost on the heat source tower 11 can be removed in a short time, and the defrosting of the heat source tower 11 can be improved. Frost efficiency.

When the heat source tower 11 system is in heating mode, close the third electric valve 25, the fourth control valve 26 and the fifth control valve 27, so that the heat source tower 11, the buffer mechanism 21, the water pump 22, the heat exchanger 231 and the electric heater 232 is not connected, thereby closing the defrosting circuit, closing the water pump 22, so that the first refrigerant in the defrosting circuit does not flow, and opening the fourth electric valve 12, the sixth control valve 13, and the seventh control valve 14, so that the heat source tower 11 is connected with the external heat exchange mechanism, thereby opening the heat exchange circuit.

It should be further explained that the defrosting circuit may also only include at least one of the third electric valve 25, the fourth control valve 26, and the fifth control valve 27, and the heat exchange circuit may also only include the fourth electric valve 12, the sixth At least one of the control valve 13 and the seventh control valve 14 can be connected to the defrost circuit by opening or closing at least one of the third electric valve 25, the fourth control valve 26, and the fifth control valve 27. Or closing at least one of the fourth electric valve 12, the sixth control valve 13 and the seventh control valve 14 can realize the communication of the heat exchange circuit, and this change does not deviate from the principle of the present invention.

Preferably, the fourth control valve 26, the fifth control valve 27, the sixth control valve 13 and the seventh control valve 14 are manual control valves to facilitate the maintenance and replacement of the heat source tower 11.

Preferably, the third electric valve 25 and the fourth electric valve 12 may be water circuit electric valves, or other electric valves such as air circuit electric valves and oil circuit electric valves.

Preferably, the external heat exchange mechanism includes an indoor heat exchanger and an outdoor heat exchanger.

Preferably, the third refrigerant in the heat exchange circuit is a refrigerant, such as freon, saturated hydrocarbon, unsaturated hydrocarbon, and the like.

In addition, the present invention also provides a defrosting control method for a heat source tower system. The heat source tower system includes the above heat exchange circuit and the above defrost circuit; the heat exchange circuit includes a heat source tower, the heat source tower and the external heat exchange mechanism are cyclically connected ; The defrosting circuit includes a buffer mechanism, a conveying mechanism, a heating mechanism and a heat source tower that are connected end to end in turn; the heat source tower includes a shell and a heat exchanger arranged in the shell. As shown in Figure 2, the defrost control method includes the following steps:

S1. When the heat source tower system is in heating mode, judge whether the heat exchanger needs to be defrosted;

S2, according to the judgment result of whether the heat exchanger needs to be defrosted, selectively make the heat source tower system enter the defrost mode.

In a preferred embodiment, the heat source tower further includes a wind pressure switch installed on the housing; in the above step S1, the step of "determining whether the heat exchanger needs to be defrosted" specifically includes:

S111. Judge whether the wind pressure switch is turned on;

S112. If the wind pressure switch is turned on, it is determined that the heat exchanger needs to be defrosted;

S113. If the wind pressure switch is closed, it is determined that the heat exchanger does not need to be defrosted.

In step S112, if the wind pressure switch is turned on, it indicates that the heat exchanger has been frosted and the thickness of the frost is thick, and the heat exchanger cannot operate normally, and it is determined that the heat exchanger needs to be defrosted.

In step S113, if the wind pressure switch is closed, it means that the heat exchanger is not yet frosted or the frost thickness is thin, and the heat exchanger can operate normally, and it is determined that the heat exchanger does not need to be defrosted.

As an alternative implementation method, in the above step S1, the step of "determining whether the heat exchanger needs to be defrosted" specifically includes:

S121. Obtain the inlet temperature of the heat exchanger;

S122. Obtain the outlet temperature of the heat exchanger;

S123: Determine whether the difference between the inlet temperature and the outlet temperature is less than a first preset temperature difference threshold;

S124: If the difference between the inlet temperature and the outlet temperature is less than the first preset temperature difference threshold, it is determined that the heat exchanger needs to be defrosted;

S125: If the difference between the inlet temperature and the outlet temperature is greater than or equal to the first preset temperature difference threshold, it is determined that the heat exchanger does not need to be defrosted.

In step S124, if the difference between the inlet temperature and the outlet temperature is less than the first preset temperature difference threshold, it indicates that the heat exchanger has been frosted and the thickness of the frost is relatively thick, resulting in poor heat exchange effect of the heat exchanger. If it fails to operate normally, it is determined that the heat exchanger needs to be defrosted.

In step S125, if the difference between the inlet temperature and the outlet temperature is greater than or equal to the first preset temperature difference threshold, it indicates that the heat exchanger has not formed frost or the thickness of the frost is thin, and the heat exchange effect of the heat exchanger is better. If it can operate normally, it is determined that the heat exchanger does not need to be defrosted.

In the above steps, by setting the first preset temperature difference threshold, a conclusion is given whether the heat exchanger needs to be defrosted. Wherein, the first preset temperature difference threshold is the maximum temperature difference for judging whether defrosting is required according to the temperature difference between the inlet temperature and the outlet temperature of the heat exchanger. Of course, the first preset temperature difference threshold is not limited to the temperature difference in the above examples, but may also be other temperature differences, such as the temperature difference obtained by those skilled in the art based on experiments under specific working conditions, or the empirical temperature difference obtained based on experience. The personnel can flexibly adjust and set.

As yet another alternative implementation method, in the above step S1, the step of "determining whether the heat exchanger needs to be defrosted" specifically includes:

S131. Obtain the outlet temperature of the heat exchanger;

S132. Obtain the ambient temperature;

S133: Determine whether the difference between the outlet temperature and the ambient temperature is greater than a second preset temperature difference threshold;

S134: If the difference between the outlet temperature and the ambient temperature is greater than the second preset temperature difference threshold, it is determined that the heat exchanger needs to be defrosted;

S135. If the difference between the outlet temperature and the ambient temperature is less than or equal to the second preset temperature difference threshold, it is determined that the heat exchanger does not need to be defrosted.

In step S134, if the difference between the outlet temperature and the ambient temperature is greater than the second preset temperature difference threshold, it means that the heat exchanger has been frosted and the thickness of the frost is relatively thick, resulting in poor heat exchange effect of the heat exchanger. If it fails to operate normally, it is determined that the heat exchanger needs to be defrosted.

In step S135, if the difference between the outlet temperature and the ambient temperature is less than or equal to the second preset temperature difference threshold, it means that the heat exchanger is not yet frosted or the frost thickness is thin, and the heat exchange effect of the heat exchanger is better. If it can operate normally, it is determined that the heat exchanger does not need to be defrosted.

In the above steps, by setting the second preset temperature difference threshold, a conclusion is given whether the heat exchanger needs to be defrosted. Wherein, the second preset temperature difference threshold is the minimum temperature difference for judging whether defrosting is required according to the temperature difference between the outlet temperature of the heat exchanger and the ambient temperature. Of course, the second preset temperature difference threshold is not limited to the temperature difference in the above examples, but may also be other temperature differences, for example, the temperature difference obtained by those skilled in the art based on experiments under specific working conditions, or the empirical temperature difference obtained based on experience. The personnel can flexibly adjust and set.

In a preferred embodiment, in the above step S2, the step of "selectively bringing the heat source tower system into the defrost mode according to the judgment result of whether the heat exchanger needs to be defrosted" specifically includes:

S21. If the heat exchanger needs to be defrosted, make the heat source tower system enter the defrost mode;

S22. If the heat exchanger does not need to be defrosted, the heat source tower system is maintained in the heating mode and does not enter the defrost mode.

In step S21, if the heat exchanger needs to be defrosted, it means that the heat exchanger has been frosted and the thickness of the frost is thick, resulting in poor heat exchange effect of the heat exchanger, and the heat exchanger cannot operate normally. Frost causes the heat source tower system to enter the defrost mode.

In step S22, if the heat exchanger does not need to be defrosted, it means that the heat exchanger is not yet frosted or the thickness of the frost is relatively thin. Defrosting makes the heat source tower system maintain the heating mode and does not enter the defrosting mode.

Preferably, the defrosting circuit further includes a second target flow switch; in the above step S21, the step of "putting the heat source tower system into the defrosting mode" specifically includes:

S211: Determine whether the second target stream switch is turned on;

S212. If the second target flow switch is turned on, the heat source tower system enters the defrost mode;

S213. If the second target flow switch is closed, the heat source tower system does not enter the defrost mode.

In step S212, if the second target flow switch is turned on, it indicates that the first refrigerant in the defrosting circuit can flow normally and the defrosting circuit can operate normally, so that the heat source tower system enters the defrosting mode.

In step 213, if the second target flow switch is closed, it means that the first refrigerant in the defrost circuit cannot flow normally, and the defrost circuit cannot operate normally, so that the heat source tower system does not enter the defrost mode.

Preferably, after step S213 "make the heat source tower system not enter the defrost mode", the defrost control method further includes:

S31. Send a prompt message to prompt the user to cut off the flow of the first refrigerant in the defrosting circuit.

Preferably, the heat source tower system can send prompt information in the form of voice, text, picture, light, etc. to prompt the user to cut off the flow of the first refrigerant in the defrosting circuit.

In the case of using a heat exchanger to heat the first refrigerant in the defrosting circuit, the heat exchanger also includes a first target flow switch; in the above step S212, "if the second target flow switch is turned on, the heat source tower system will enter the defrost The steps of "Frost Mode" also include:

S2121: Determine whether the first target stream switch is turned on;

S2122, if the first target flow switch is turned on, the heat source tower system enters the defrost mode;

S2123: If the first target flow switch is closed, the heat source tower system does not enter the defrost mode.

In step S2122, if the first target flow switch is turned on, it indicates that the second condensation can normally flow between the heat exchanger and the external heat source, and the heat exchanger can operate normally, so that the heat source tower system enters the defrost mode.

In step S2123, if the first target flow switch is closed, it means that the second condensation is cut off between the heat exchanger and the external heat source, and the heat exchanger cannot operate normally, so that the heat source tower system does not enter the defrost mode.

It needs to be further explained that it is also possible to first determine whether the first target stream switch is turned on, and then determine whether the second target stream switch is turned on; it is also possible to determine whether the second target stream switch and the first target stream switch are turned on at the same time. The sequence for judging whether the second target flow switch and the first target flow switch are turned on can be flexibly adjusted and set.

It should be further explained that when the electric heater is used to heat the first refrigerant in the defrosting circuit, the step of determining whether the first target flow switch is turned on is not performed. In the case that the heat exchanger and the electric heater are used to heat the first refrigerant in the defrosting circuit at the same time, it is necessary to perform the step of determining whether the first target flow switch is turned on.

Preferably, after step S2123 "make the heat source tower system not enter the defrost mode", the defrost control method further includes:

S32. Send a prompt message to remind the user that the heat exchanger cannot operate normally.

Preferably, the heat source tower system can send prompt information in the form of voice, text, picture, light, etc., to remind the user that the heat exchanger cannot operate normally.

Referring now to FIG. 3, FIG. 3 is a flowchart of a defrost control method according to an embodiment of the present invention.

As shown in Figure 3, in a possible implementation manner, the process of the defrost control method for the heat source tower system of the present invention may be:

S111. When the heat source tower system is in heating mode, judge whether the wind pressure switch is turned on;

S112. If the wind pressure switch is turned on, it is determined that the heat exchanger needs to be defrosted;

S113. If the wind pressure switch is closed, it is determined that the heat exchanger does not need to be defrosted;

After step S112, perform step S211;

S211: Determine whether the second target stream switch is turned on;

S2121, if the second target flow switch is turned on, determine whether the first target flow switch is turned on;

S2122, if the first target flow switch is turned on, the heat source tower system enters the defrost mode;

S2123: If the first target flow switch is closed, the heat source tower system does not enter the defrost mode;

S213. If the second target flow switch is closed, the heat source tower system does not enter the defrost mode;

After step S213, perform step S31;

S31. Send a prompt message to prompt the user to cut off the flow of the first refrigerant in the defrosting circuit;

After step S2123, perform step S32;

S32. Send a prompt message to remind the user that the heat exchanger cannot operate normally;

After step S113, perform step S22;

S22. Make the heat source tower system maintain the heating mode without entering the defrosting mode.

In addition, the combination of method steps of the present invention is not limited to the above-listed combination. Those skilled in the art can flexibly adjust the combination of the above method steps in practical applications. No matter what combination of method steps is used, as long as it can be The scale attached to the heating element can be removed.

It should be pointed out that the above-mentioned embodiment is only a preferred embodiment of the present invention. It is only used to illustrate the principle of the method of the present invention and is not intended to limit the protection scope of the present invention. In practical applications, those skilled in the art The above-mentioned function allocation can be completed by different steps according to needs, that is, the steps in the embodiment of the present invention are decomposed or combined. For example, the steps in the above-mentioned embodiments can be combined into one step, or can be further divided into multiple sub-steps to complete all or part of the functions described above. The names of the steps involved in the embodiments of the present invention are only used to distinguish each step, and are not regarded as a limitation of the present invention.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, those skilled in the art will readily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. A heat source tower system, characterized in that the heat source tower system includes a heat exchange circuit and a defrost circuit;

   The heat exchange loop includes the heat source tower, and the heat source tower is cyclically connected to an external heat exchange mechanism;

   The defrosting circuit includes a buffer mechanism, a conveying mechanism, a heating mechanism, and the heat source tower that are connected end to end in sequence, and the conveying mechanism, the buffer mechanism, and the heating mechanism are set to: when the heat source tower system is in defrosting In the frost mode, the conveying mechanism circulates the first refrigerant in the defrosting circuit, the buffer mechanism buffers the pressure of the first refrigerant, and the heating mechanism heats the first refrigerant to The heating method defrosts the heat source tower.
2. The heat source tower system according to claim 1, wherein the heating mechanism comprises a heat exchanger, and the heat exchanger is connected between the outlet end of the conveying mechanism and the inlet end of the heat source tower. The first refrigerant in the defrosting circuit and the second refrigerant in the heat exchanger exchange heat.
3. The heat source tower system according to claim 2, wherein the heat exchanger comprises:

   A shell, the inside of the shell forms a heat exchange chamber;

   A first heat exchange pipeline, the first heat exchange pipeline is arranged in the heat exchange chamber, and the outlet end of the conveying mechanism is connected to the inlet end of the heat source tower through the first heat exchange pipeline;

   A second heat exchange pipeline, the second heat exchange pipeline is arranged in the heat exchange chamber, and the second heat exchange pipeline is cyclically connected to an external heat source.
4. The heat source tower system according to claim 3, wherein the heat exchanger further comprises a first electric valve and a first target flow switch, and the first electric valve is connected to the outlet end of the external heat source and the Between the inlet ends of the second heat exchange pipeline, the first target flow switch is connected between the outlet end of the second heat exchange pipeline and the inlet end of the external heat source, and the first target flow The switch is used to detect whether the heat exchanger can operate normally.
5. The heat source tower system according to claim 3, wherein the heating mechanism further comprises a heater, and the heater is connected between the outlet end of the first heat exchange pipe and the inlet end of the heat source tower , Used to heat the first refrigerant.
6. The heat source tower system according to claim 1, wherein the buffer mechanism comprises a buffer tank connected between the inlet end of the conveying mechanism and the outlet end of the heat source tower for buffering The pressure of the first refrigerant.
7. The heat source tower system according to claim 6, wherein the buffer mechanism further comprises a bypass pipeline, and the bypass pipeline and the buffer tank are connected in parallel.
8. The heat source tower system according to claim 7, wherein the buffer tank is further equipped with a second electric valve, and the second electric valve is used to selectively open or close the valve according to the pressure of the first refrigerant.述Buffer tank.
9. The heat source tower system according to any one of claims 1 to 8, wherein the defrost circuit further comprises a second target flow switch, and the second target flow switch is connected to the inlet end of the buffer mechanism Between it and the outlet end of the heat source tower for detecting whether the defrosting circuit can operate normally; and/or

   The heat source tower includes a shell, a heat exchanger arranged in the shell, and a fan, and the fan is used to provide a heat exchange airflow for the heat exchanger.
10. The heat source tower system according to claim 9, wherein the heat source tower further comprises a detection component provided on the housing, and the detection component is used to detect whether the heat exchanger is frosted.

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