CN217715508U - Heat pump system - Google Patents
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- CN217715508U CN217715508U CN202221863606.4U CN202221863606U CN217715508U CN 217715508 U CN217715508 U CN 217715508U CN 202221863606 U CN202221863606 U CN 202221863606U CN 217715508 U CN217715508 U CN 217715508U
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Abstract
The present disclosure relates to a heat pump system comprising: the heat pump system comprises a compressor, a first heat exchange device, a throttling device and a second heat exchange device, wherein the compressor is used for forming at least two refrigerant circulation loops, the at least two refrigerant circulation loops comprise a first refrigerant circulation loop and a second refrigerant circulation loop, and the heat pump system further comprises: the first switching device is configured to switch between a first refrigerant circulation loop and a second refrigerant circulation loop, wherein in the first refrigerant circulation loop, a refrigerant is discharged from the compressor, sequentially flows through the first heat exchange device, the throttling device and the second heat exchange device, and then returns to the compressor, and in the second refrigerant circulation loop, the refrigerant flows out of the compressor, sequentially flows through the second heat exchange device, the throttling device and the first heat exchange device, and then returns to the compressor; and the second switching device is configured to switch the inlet and outlet direction of the refrigerant flowing through the first heat exchange device relative to the first heat exchange device.
Description
Technical Field
The present disclosure relates to the field of air conditioners, and more particularly, to a heat pump system.
Background
In some related art heat pump units, a finned heat exchanger in the heat pump unit melts a frozen frost layer on fins by a defrosting mode of operation of the heat pump unit. However, the frost layer melts more slowly and does not melt cleanly easily.
SUMMERY OF THE UTILITY MODEL
The inventor researches and discovers that the finned heat exchanger in the related art has the phenomena of slow defrosting and incomplete defrosting, mainly because the frosting on the fins of the finned heat exchanger gradually thins from the outside to the inside of the fins when the unit is in heating operation, and the air flowing from the outside of the fins to the inside of the fins is subjected to partial heat exchange before the outside of the fins when the unit is in operation, so that the frost layer on the outside of the fins is thicker than the frost layer on the inside of the fins, and when the unit enters a defrosting mode, the temperature of the fins of the finned heat exchanger gradually decreases from inside to outside, so that the temperature of the parts on the fins with thinner frosting is slower, the defrosting is faster, the temperature of the parts with thicker frosting is lower, and the defrosting is slower, so that the fin defrosting speed of the whole finned heat exchanger is uneven, the problems of slow defrosting, unclean defrosting and more energy consumption for completely defrosting are caused, and the adaptability of the heat pump unit in the related art on various working modes is still to be improved.
In view of this, the disclosed embodiments provide a heat pump system capable of improving adaptability to various operation modes.
In one aspect of the present disclosure, there is provided a heat pump system including: the heat pump system comprises a compressor, a first heat exchange device, a throttling device and a second heat exchange device, wherein the compressor, the first heat exchange device, the throttling device and the second heat exchange device are used for forming at least two refrigerant circulation loops, the at least two refrigerant circulation loops comprise a first refrigerant circulation loop and a second refrigerant circulation loop, and the heat pump system further comprises:
a first switching device configured to switch between the first refrigerant circulation circuit in which a refrigerant is discharged from the compressor, sequentially flows through the first heat exchange device, the throttling device, and the second heat exchange device, and then returns to the compressor, and a second refrigerant circulation circuit in which a refrigerant flows out of the compressor, sequentially flows through the second heat exchange device, the throttling device, and the first heat exchange device, and then returns to the compressor; and
the second switching device is configured to switch the inlet and outlet direction of the refrigerant flowing through the first heat exchange device relative to the first heat exchange device.
In some embodiments, the first switching device comprises:
the first four-way valve is respectively communicated with the exhaust port of the compressor, the first heat exchange device, the suction port of the compressor and the second heat exchange device, and is configured to enable the exhaust port of the compressor to be communicated with the first heat exchange device and enable the suction port of the compressor to be communicated with the second heat exchange device in a first switching state, and enable the exhaust port of the compressor to be communicated with the second heat exchange device and enable the suction port of the compressor to be communicated with the first heat exchange device in a second switching state.
In some embodiments, the first heat exchange device has a first refrigerant port and a second refrigerant port; the second switching device includes:
and the second four-way valve is respectively communicated with the first switching device, the first refrigerant port, the throttling device and the second refrigerant port, and is configured to enable the throttling device to be communicated with the first refrigerant port and the first switching device to be communicated with the second refrigerant port in a third switching state, and enable the throttling device to be communicated with the second refrigerant port and the first switching device to be communicated with the first refrigerant port in a fourth switching state.
In some embodiments, the heat pump system has a plurality of operating modes including: a heating mode and a defrosting mode;
the first switching device is configured to switch to the second refrigerant circulation loop and the first refrigerant circulation loop respectively in the heating mode and the defrosting mode, and the second switching device is configured to make the inlet and outlet directions of the refrigerant relative to the first heat exchange device when the refrigerant flows through the first heat exchange device in the heating mode and the inlet and outlet directions relative to the first heat exchange device when the refrigerant flows through the first heat exchange device in the defrosting mode the same.
In some embodiments, the first heat exchange means comprises:
a fan; and
a fin heat exchanger arranged at the air inlet side of the fan,
the fin heat exchanger comprises a plurality of layers of fins arranged at intervals and refrigerant pipes penetrating through the plurality of layers of fins, wherein a first pipe orifice of one side, far away from the fan, of each refrigerant pipe and a second pipe orifice of one side, close to the fan, of each refrigerant pipe are respectively connected with the second switching device.
In some embodiments, the second switching device is configured to communicate the throttling device with the first nozzle and communicate the first switching device with the second nozzle in the heating mode, and to communicate the first switching device with the first nozzle and communicate the throttling device with the second nozzle in the defrosting mode.
In some embodiments, the plurality of operating modes further comprises: a cooling mode;
the first switching device is configured to be switched to the first refrigerant circulation loop in both the cooling mode and the defrosting mode, and the second switching device is configured to enable the inlet and outlet direction of the refrigerant flowing through the first heat exchange device in the cooling mode relative to the first heat exchange device to be the same as or opposite to the inlet and outlet direction of the refrigerant flowing through the first heat exchange device in the defrosting mode relative to the first heat exchange device.
In some embodiments, the heat pump system further comprises:
and the defrosting thermal bulb is arranged at the position, adjacent to the first pipe orifice, of the finned heat exchanger.
In some embodiments, the heat pump system further comprises:
and the gas-liquid separator is arranged between the suction port of the compressor and the first switching device in series.
In some embodiments, the heat pump system further comprises:
and the filter is arranged between the second switching device and the throttling device, between the throttling device and the second heat exchange device, and/or between the second heat exchange device and the first switching device in series.
Therefore, according to the embodiment of the disclosure, the first refrigerant circulation circuit and the second refrigerant circulation circuit are switched by the first switching device in the heat pump system, so that the refrigeration or heating circulation of the refrigerant can be realized, and the flow direction of the refrigerant in the first heat exchange device under different working modes can be controlled by the second switching device in the inlet and outlet direction of the refrigerant flowing through the first heat exchange device, so that the adaptability of the heat pump system in various working modes is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of some embodiments of a heat pump system according to the present disclosure;
FIG. 2 is a schematic diagram of a first heat exchange device in some embodiments of a heat pump system according to the present disclosure;
FIG. 3 is a schematic view of the refrigerant flow direction and the external airflow direction of the first heat exchange device according to some embodiments of the heat pump system of the present disclosure;
fig. 4 is a control flow schematic of some embodiments of a heat pump system according to the present disclosure.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.
The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
Fig. 1 is a schematic diagram of some embodiments of a heat pump system according to the present disclosure. Referring to fig. 1, the present disclosure provides a heat pump system comprising: the heat exchanger comprises a compressor 1, a first heat exchange device 2, a throttling device 3 and a second heat exchange device 4, wherein the compressor is used for forming at least two refrigerant circulation loops. The at least two refrigerant circulation circuits include, but are not limited to, a first refrigerant circulation circuit and a second refrigerant circulation circuit.
In the first refrigerant circulation loop, a refrigerant is discharged from the compressor 1, sequentially flows through the first heat exchange device 2, the throttling device 3 and the second heat exchange device 4, and then returns to the compressor 1. At this time, the first heat exchanger 2 serves as a condenser in the first refrigerant circulation circuit, and the second heat exchanger 4 serves as an evaporator in the first refrigerant circulation circuit, thereby implementing a refrigeration cycle of the refrigerant.
In the second refrigerant circulation loop, a refrigerant flows out of the compressor 1, sequentially flows through the second heat exchange device 4, the throttling device 3 and the first heat exchange device 2, and then returns to the compressor 1. At this time, the second heat exchanger 4 serves as a condenser in the second refrigerant circulation circuit, and the first heat exchanger 2 serves as an evaporator in the second refrigerant circulation circuit, thereby realizing a heating cycle of the refrigerant.
In order to realize the switching between each refrigerant circulation loop, the heat pump system further comprises: a first switching means 5. The first switching device 5 is configured to switch between the first refrigerant circulation circuit and the second refrigerant circulation circuit. In order to improve the adaptability of the heat pump system to different working modes, the heat pump system further includes a second switching device 6, and the second switching device 6 is configured to switch the inlet and outlet directions of the refrigerant flowing through the first heat exchange device 2 relative to the first heat exchange device 2.
The first refrigerant circulation loop and the second refrigerant circulation loop are switched through the first switching device in the heat pump system, so that refrigeration or heating circulation of the refrigerant can be achieved, the flowing direction of the refrigerant in the first heat exchange device under different working modes can be controlled through the inlet and outlet direction of the refrigerant flowing through the first heat exchange device through the second switching device, and the adaptability of the heat pump system in multiple working modes is further improved.
In a heat pump system, the second heat exchange means may be used for heat exchange of user side hot water, while the first heat exchange means may be used for heat exchange of the heat pump system with an ambient heat source (e.g. air, water, etc.). For example, in a heating cycle, the first heat exchange device can absorb heat in air, and the heat is exchanged to water on the user side through the second heat exchange device, so that hot water can be obtained by the user. The second heat exchange means may include, but is not limited to, a plate heat exchanger and the first heat exchange means includes, but is not limited to, a fin heat exchanger.
The compressor 1 in the heat pump system 1 can suck a low-pressure low-temperature refrigerant from the intake port and discharge the high-temperature high-pressure refrigerant from the exhaust port by compressing the refrigerant. The throttling device 3 can adopt a capillary tube or an electronic expansion valve and the like, and can perform throttling depressurization and flow regulation on the refrigerant.
The heat pump system may further include other elements, such as a gas-liquid separator 8 in fig. 1, in addition to the compressor 1, the first heat exchanger 2, the throttling device 3, and the second heat exchanger 4, where the gas-liquid separator 8 may be serially disposed between the suction port of the compressor 1 and the first switch device 5, and performs gas-liquid separation on the refrigerant from the first switch device 5, so as to reduce or eliminate liquid refrigerant entering the suction port of the compressor 1, thereby reducing the risk of compressor liquid slugging.
Also for example the filter 9 in fig. 1, the filter 9 may be arranged in series between the second switching device 6 and the throttling device 3, between the throttling device 3 and the second heat exchanging device 4, and/or between the second heat exchanging device 4 and the first switching device 5. The filter 9 can filter the refrigerant, so as to prevent impurities (such as oil stains, metal oxides and the like) in the refrigerant from being filtered, thereby reducing the risk of blocking pipelines and the like.
Referring to fig. 1, in some embodiments, the first switching device 5 comprises: a first four-way valve. The first four-way valve is respectively communicated with the exhaust port of the compressor 1, the first heat exchange device 2, the suction port of the compressor 1 and the second heat exchange device 4. In fig. 1, four ports a, b, c and d of a first four-way valve are respectively in direct or indirect communication with the discharge port of the compressor 1, the first heat exchange means 2, the suction port of the compressor 1 and the second heat exchange means 4.
The first four-way valve enables the exhaust port of the compressor 1 to communicate with the first heat exchange device 2 and the suction port of the compressor 1 to communicate with the second heat exchange device 4 in a first switching state. In fig. 1, a first switching state of the first four-way valve is specifically that the interface a and the interface b of the first four-way valve are communicated, and the interface c and the interface d are communicated. This state may be an on state or an off state of the first four-way valve.
The first four-way valve can also enable the exhaust port of the compressor 1 to be communicated with the second heat exchange device 4 and enable the suction port of the compressor 1 to be communicated with the first heat exchange device 2 in a second switching state. In fig. 1, the second switching state of the first four-way valve is specifically that the interface a and the interface d of the first four-way valve are communicated, and the interface c and the interface b are communicated. This state may be a closed state or an open state of the first four-way valve.
Referring again to fig. 1, in some embodiments, the first heat exchanging device 2 has a first refrigerant port 2a and a second refrigerant port 2b. The second switching device 6 includes: a second four-way valve. The second four-way valve is respectively communicated with the first switching device 5, the first refrigerant port 2a, the throttling device 3 and the second refrigerant port 2b. In fig. 1, four ports a ', b', c ', and d' of the second four-way valve are respectively in direct or indirect communication with the first switching device 5, the first refrigerant port 2a, the throttle device 3, and the second refrigerant port 2b.
The second four-way valve is capable of communicating the throttle device 3 with the first refrigerant port 2a and the first switching device 5 with the second refrigerant port 2b in a third switching state. In fig. 1, the third switching state of the second four-way valve is specifically that the interface a 'and the interface b' of the second four-way valve are communicated, and the interface c 'and the interface d' are communicated. This state may be an on state or an off state of the second four-way valve.
The second four-way valve is also capable of communicating the throttle device 3 with the second refrigerant port 2b and communicating the first switching device 5 with the first refrigerant port 2a in a fourth switching state. In fig. 1, the fourth switching state of the second four-way valve is specifically that the interface a 'and the interface d' of the second four-way valve are communicated, and the interface c 'and the interface b' are communicated. This state may be a closed state or an open state of the second four-way valve.
The heat pump system may have a plurality of operating modes, such as a heating mode and a defrosting mode. In the defrosting mode, the refrigerant circulates in the opposite direction between the respective elements in the heat pump system as compared with the heating mode. In the defrosting mode, the first switching device 5 can switch the heat pump system to a first refrigerant circulation circuit in which a refrigerant is discharged from the compressor 1, sequentially flows through the first heat exchange device 2, the throttling device 3, and the second heat exchange device 4, and then returns to the compressor 1. At this time, the first heat exchange device 2 functions as a condenser in the first refrigerant circulation circuit, and the second heat exchange device 4 functions as an evaporator in the first refrigerant circulation circuit.
In the heating mode, the first switching device 5 can switch the heat pump system to a second refrigerant circulation circuit, and in this refrigerant circulation circuit, the refrigerant flows out of the compressor 1, sequentially flows through the second heat exchange device 4, the throttling device 3, and the first heat exchange device 2, and then returns to the compressor 1. In this case, the second heat exchanger 4 functions as a condenser in the second refrigerant circulation circuit, and the first heat exchanger 2 functions as an evaporator in the second refrigerant circulation circuit.
If the heat pump system does not include the second switching device 6, the refrigerant flowing directions of the first refrigerant circulation loop and the second refrigerant circulation loop are opposite, and the direction in which the refrigerant enters the first heat exchange device 2 in the defrosting mode is also opposite to the direction in which the refrigerant enters the first heat exchange device 2 in the heating mode, so that the refrigerant is difficult to adjust to be the same according to actual needs. In this embodiment, by providing the second switching device 6, the direction of the refrigerant passing through the first heat exchange device 2 in the heating mode relative to the inlet and outlet direction of the refrigerant passing through the first heat exchange device 2 in the defrosting mode relative to the first heat exchange device 2 may be the same, so as to meet the specific requirements of refrigerant control in different working modes.
For the embodiment that the plurality of operation modes further include the cooling mode, the first switching device 5 can be switched to the first refrigerant circulation circuit in both the cooling mode and the defrosting mode, and the first refrigerant circulation circuit is adopted in both the cooling mode and the defrosting mode, so that the high-temperature and high-pressure gaseous refrigerant discharged by the compressor flows into the first heat exchange device 2 first. The difference is that the first heat exchange device 2 in the cooling mode is used as a condenser to absorb the cooling capacity of the air side, and correspondingly, for the fin heat exchanger adopting the fan, the fan is opened in the cooling mode. In the defrosting mode, the frozen frost layer on the first heat exchange device 2 is melted by using the high temperature of the gaseous refrigerant, and accordingly, for the fin heat exchanger adopting the fan, the fan is closed in the defrosting mode.
The second switching device 6 may enable an in-out direction of the refrigerant flowing through the first heat exchanger 2 in the refrigeration mode with respect to the first heat exchanger 2 to be opposite to an in-out direction of the refrigerant flowing through the first heat exchanger 2 in the defrosting mode with respect to the first heat exchanger 2, and may also enable the in-out direction of the refrigerant flowing through the first heat exchanger 2 in the refrigeration mode with respect to the first heat exchanger 2 to be the same as the in-out direction of the refrigerant flowing through the first heat exchanger 2 in the defrosting mode with respect to the first heat exchanger 2.
Fig. 2 is a schematic diagram of a first heat exchange device in some embodiments of a heat pump system according to the present disclosure. Fig. 3 is a schematic view illustrating a refrigerant flowing direction and an external air flow direction of the first heat exchanging device according to some embodiments of the heat pump system of the disclosure. Referring to fig. 2 and 3, in some embodiments, the first heat exchange device 2 comprises: a fan 21 and a finned heat exchanger 22. The fin heat exchanger 22 is disposed on the intake side of the fan 21.
The fin heat exchanger 22 includes a plurality of layers of fins 221 arranged at intervals and refrigerant tubes 222 passing through the plurality of layers of fins 221. A first nozzle 222a of the refrigerant pipe 222 on a side away from the fan 21 and a second nozzle 222b of the refrigerant pipe 222 on a side adjacent to the fan 21 are respectively connected to the second switching device 6. Referring to fig. 1, the first nozzle 222a may correspond to the first refrigerant port 2a of the first heat exchanging device 2, and the second nozzle 222b may correspond to the second refrigerant port 2b of the first heat exchanging device 2.
In fig. 2 and 3, the plurality of layers of fins 221 may be arranged at intervals in the circumferential direction of the rotational axis of the fan and may enclose a closed or non-closed region. The fan 21 may be located above the fin heat exchanger 22, and its air inlet is opposite to the area enclosed by the multiple layers of fins 221. Fig. 3 is a view corresponding to the arrangement of the fins and refrigerant tubes in the top view of fig. 2, and it can be seen that the first nozzle 222a and the second nozzle 222b can be arranged on one side of the fin heat exchanger 22 to facilitate the pipe connection.
As can be seen from the airflow direction shown by the solid line with the arrow in fig. 2, when the fan is turned on, the air is collected from the outside to the middle of the fin heat exchanger 22 by the driving of the fan 21, and is blown upward through the fan 21. In the heating mode, air flows into the inner side of the fin 221 (i.e., the right side of the refrigerant pipe 222 in fig. 3) from the outer side of the fin 221 (i.e., the left side of the refrigerant pipe 222 in fig. 3), and the air exchanges heat with the outer side of the fin first, so that the outer frost layer 223a is thicker than the inner frost layer 223 b.
In the defrosting mode of the related art, when the refrigerant flows through the fin heat exchanger 22, the refrigerant first passes through the inner side of the fin 221, which causes the local wall temperature of the fin with thin frost to be higher, and the local wall temperature of the fin with thick frost to be lower, thereby easily causing the problem of slow defrosting or incomplete defrosting.
In this embodiment, the second switching device 6 is capable of communicating the throttling device 3 with the first nozzle 222a and communicating the first switching device 5 with the second nozzle 222b in the heating mode, and communicating the first switching device 5 with the first nozzle 222a and communicating the throttling device 3 with the second nozzle 222b in the defrosting mode.
After the fin heat exchanger 22 frosts in the heating mode, the refrigerant firstly enters the first pipe orifice 222a of the refrigerant pipe 222 corresponding to the part of the fin with thick frosting through the switching of the second switching device 6 in the defrosting mode, and flows out from the second pipe orifice 222b of the refrigerant pipe 222 corresponding to the part of the fin with thin frosting, so that a thicker frost layer is melted through the refrigerant with higher temperature, and a thinner frost layer is melted after the temperature is gradually reduced, so that the melting speed of the frost layer with uneven thickness on the fin is more uniform, the overall defrosting speed is increased, the defrosting energy consumption is reduced, and the unit heating energy efficiency is improved.
In order to defrost in time, the heat pump system can continuously judge whether the preset defrosting condition is met, and enters a defrosting mode when the preset defrosting condition is met. In order to further reduce energy consumption in the defrosting mode, the heat pump system can continuously judge whether the preset defrosting quitting condition is met during defrosting, and returns to the heating mode when the preset defrosting quitting condition is met. The preset defrosting condition and the preset exiting defrosting condition may include one or more, and the related parameters may be the same or different, for example, the preset defrosting condition and the preset exiting defrosting condition may include at least one of an operating time of the heat pump system, a defrosting temperature difference of the fin heat exchanger, and a water temperature condition of the user-side heat exchanger.
In fig. 1, the heat pump system may further include a defrosting bulb 7, and the defrosting bulb 7 is disposed at a position of the finned heat exchanger 22 adjacent to the first nozzle 222a, and is used for measuring the temperature at the position in real time, and also used for judging a preset defrosting condition and a preset defrosting exiting condition.
Fig. 4 is a control flow schematic of some embodiments of a heat pump system according to the present disclosure. The control process of the heat pump system will be briefly described with reference to the flowchart shown in fig. 4.
In fig. 4, a control flow of the heat pump system may be implemented by a processor or a control platform in the heat pump system, and the control flow includes:
s1, powering up a heat pump unit, and starting a compressor in the heat pump system;
s2, after the compressor is started for a certain time, judging whether to execute a refrigeration mode, wherein the refrigeration mode can be determined by whether an instruction for selecting the refrigeration mode is received and input by a user on a manual operator or a remote controller; if the cooling mode is determined to be executed, turning to step S3, otherwise, turning to step S4;
step S3, executing a heating mode of the heat pump system, closing the first four-way valve and closing the second four-way valve, wherein the flow direction of the refrigerant in the refrigerant circulation loop in the figure 1 is 1 → a → b → a '→ d' → 2b → 2a → b '→ c' → 3 → 4 → d → c → 8 → 1, and the flow direction of the refrigerant and the air flow direction of the fin heat exchanger present a countercurrent refrigeration state;
s4, judging whether a defrosting instruction is received, wherein the instruction can be manually input by an operator through a manual operator or a remote controller, and the operator can input the defrosting instruction when knowing that frosting exists on the fin heat exchanger through observation or other information so as to prevent a frost layer on the fin from influencing the heating capacity of the unit; if a defrosting instruction is received, turning to the step S7, otherwise, turning to the step S5;
step S5, executing a heating mode of the heat pump system, opening the first four-way valve, and closing the second four-way valve, where the refrigerant flow direction in the refrigerant circulation loop in fig. 1 is as follows: 1 → a → d → 4 → 3 → c '→ b' → 2a → 2b → d '→ a' → b → c → 8 → 1, and the flow direction of the refrigerant and the flow direction of the air in the fin heat exchanger exhibit a downstream heating state;
s6, continuously judging whether a preset defrosting condition is met or not in the heating mode, wherein the preset defrosting condition can comprise one or more conditions, such as the running time of a heat pump unit, defrosting temperature difference, water temperature and the like; if the preset defrosting condition is met, turning to the step S7, otherwise, maintaining the current heating mode, and continuing to perform the judgment operation of the step S6;
step S7, executing a defrosting mode of the heat pump system, closing the first four-way valve, and opening the second four-way valve, where the refrigerant flow direction in the refrigerant circulation loop in fig. 1 is: 1 → a → b → a '→ b' → 2a → 2b → d '→ c' → 3 → 4 → d → c → 8 → 1, the flow direction of the refrigerant and the air flow direction of the fin heat exchanger (at this time, the air flow direction refers to the air flow direction when the fan is turned on because the fan does not operate) exhibit a forward flow defrosting state;
step S8, continuously judging whether a preset defrosting exiting condition is met or not in a defrosting mode, wherein the preset defrosting exiting condition can comprise one or more conditions, such as the running time of a heat pump unit, defrosting temperature difference, water temperature and the like; if the preset defrosting exiting condition is met, turning to the step S9, otherwise, maintaining the current defrosting mode, and continuing to perform the judgment operation of the step S8;
and S9, closing the first four-way valve and opening the second four-way valve, so as to execute a defrosting mode of the heat pump system.
Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (10)
1. A heat pump system, comprising: the heat pump system comprises a compressor (1), a first heat exchange device (2), a throttling device (3) and a second heat exchange device (4) which are used for forming at least two refrigerant circulation loops, wherein the at least two refrigerant circulation loops comprise a first refrigerant circulation loop and a second refrigerant circulation loop, and the heat pump system further comprises:
a first switching device (5) configured to switch between the first refrigerant circulation circuit in which a refrigerant is discharged from the compressor (1), sequentially flows through the first heat exchange device (2), the throttling device (3), and the second heat exchange device (4), and then returns to the compressor (1), and a second refrigerant circulation circuit in which a refrigerant flows out of the compressor (1), sequentially flows through the second heat exchange device (4), the throttling device (3), and the first heat exchange device (2), and then returns to the compressor (1); and
and the second switching device (6) is configured to switch the inlet and outlet directions of the refrigerant flowing through the first heat exchange device (2) relative to the first heat exchange device (2).
2. Heat pump system according to claim 1, characterized in that said first switching means (5) comprise:
the first four-way valve is respectively communicated with the exhaust port of the compressor (1), the first heat exchange device (2), the air suction port of the compressor (1) and the second heat exchange device (4), and is configured to enable the exhaust port of the compressor (1) to be communicated with the first heat exchange device (2) and the air suction port of the compressor (1) to be communicated with the second heat exchange device (4) in a first switching state, and enable the exhaust port of the compressor (1) to be communicated with the second heat exchange device (4) and the air suction port of the compressor (1) to be communicated with the first heat exchange device (2) in a second switching state.
3. Heat pump system according to claim 1, characterized in that the first heat exchanging means (2) has a first refrigerant port (2 a) and a second refrigerant port (2 b); the second switching device (6) comprises:
and a second four-way valve which is respectively communicated with the first switching device (5), the first refrigerant port (2 a), the throttling device (3) and the second refrigerant port (2 b), and is configured to enable the throttling device (3) to be communicated with the first refrigerant port (2 a) and the first switching device (5) to be communicated with the second refrigerant port (2 b) in a third switching state, and enable the throttling device (3) to be communicated with the second refrigerant port (2 b) and the first switching device (5) to be communicated with the first refrigerant port (2 a) in a fourth switching state.
4. The heat pump system of claim 1, wherein the heat pump system has a plurality of operating modes, the plurality of operating modes comprising: a heating mode and a defrosting mode;
the first switching device (5) is configured to switch to the second refrigerant circulation circuit and the first refrigerant circulation circuit in the heating mode and the defrosting mode, respectively, and the second switching device (6) is configured to make an inlet and outlet direction of a refrigerant with respect to the first heat exchange device (2) when the refrigerant flows through the first heat exchange device (2) in the heating mode the same as an inlet and outlet direction of the refrigerant with respect to the first heat exchange device (2) when the refrigerant flows through the first heat exchange device (2) in the defrosting mode.
5. Heat pump system according to claim 4, characterized in that said first heat exchange means (2) comprise:
a fan (21); and
a finned heat exchanger (22) arranged on the air inlet side of the fan (21),
the finned heat exchanger (22) comprises a plurality of layers of fins (221) arranged at intervals and refrigerant pipes (222) penetrating through the plurality of layers of fins (221), wherein a first pipe orifice (222 a) of one side, far away from the fan (21), of the refrigerant pipe (222) and a second pipe orifice (222 b) of one side, close to the fan (21), of the refrigerant pipe (222) are respectively connected with the second switching device (6).
6. A heat pump system according to claim 5, characterized in that said second switching device (6) is configured to put said throttling device (3) in communication with said first nozzle (222 a) and said first switching device (5) in communication with said second nozzle (222 b) in said heating mode, and to put said first switching device (5) in communication with said first nozzle (222 a) and said throttling device (3) in communication with said second nozzle (222 b) in said defrosting mode.
7. The heat pump system of claim 4, wherein the plurality of operating modes further comprises: a cooling mode;
the first switching device (5) is configured to be switched to the first refrigerant circulation loop in both the cooling mode and the defrosting mode, and the second switching device (6) is configured to enable the inlet and outlet direction of a refrigerant flowing through the first heat exchange device (2) in the cooling mode relative to the first heat exchange device (2) to be the same as or opposite to the inlet and outlet direction of the refrigerant flowing through the first heat exchange device (2) in the defrosting mode relative to the first heat exchange device (2).
8. The heat pump system of claim 5, further comprising:
a defrosting bulb (7) arranged at the position of the finned heat exchanger (22) adjacent to the first nozzle (222 a).
9. The heat pump system of claim 1, further comprising:
and a gas-liquid separator (8) which is arranged in series between the suction port of the compressor (1) and the first switching device (5).
10. The heat pump system of claim 1, further comprising:
a filter (9) arranged in series between the second switching device (6) and the throttling device (3), between the throttling device (3) and the second heat exchanging device (4), and/or between the second heat exchanging device (4) and the first switching device (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221863606.4U CN217715508U (en) | 2022-07-19 | 2022-07-19 | Heat pump system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221863606.4U CN217715508U (en) | 2022-07-19 | 2022-07-19 | Heat pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046327A (en) * | 2022-07-19 | 2022-09-13 | 珠海格力电器股份有限公司 | Heat pump system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046327A (en) * | 2022-07-19 | 2022-09-13 | 珠海格力电器股份有限公司 | Heat pump system and control method thereof |
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