Heat pump system

Abstract

The utility model belongs to the technical field of heat pumps, and discloses a heat pump system which adopts hot water prepared by a condenser to perform defrosting treatment on a water receiving disc, can effectively guarantee the defrosting effect, does not need to be provided with an electric heater, and is low in cost. The problem that when an electric heater is used for conducting defrosting treatment, the defrosting function is extremely prone to failure can be effectively solved, and it is guaranteed that the heat pump system can work normally. The reliability is high, and damage is not prone to occurring. When the heat pump system is used as an outdoor product, the evaporator adopts an air heat exchanger. When the hot water prepared by the condenser is used for carrying out defrosting treatment on the water receiving disc, one part of heat energy required for defrosting comes from electric energy, the other part of heat energy comes from air energy, the conversion energy efficiency ratio is far greater than 1, the electric energy required for carrying out defrosting treatment on the water receiving disc is less, and the economic benefit is good.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a heat pump system. Background Art

[0002] A heat pump water heater or heater has a drip tray beneath the evaporator. As water vapor in the air passes through the evaporator, it cools and forms water droplets that fall into the drip tray. When the ambient temperature is low, frost forms on the evaporator, and the defrosted water from the evaporator also drips into the drip tray.

[0003] When the low temperature environment lasts for a long time, more and more ice will accumulate in the water tray, which will cause poor drainage of the water tray and seriously affect the efficiency of the heat pump.

[0004] One solution proposed in the prior art is to set an electric heating belt on the water receiving tray. When the water receiving tray needs to be defrosted, the electric heating belt is energized to generate heat to defrost the water receiving tray.

[0005] However, heat pump water heaters or heat pump heaters are mostly installed outdoors, and the electric heating belt is always exposed. Due to the influence of wind, sun, rain and snow for a long time, the electric heating belt is easily damaged and causes leakage, which makes the defrosting function of the heat pump fail.

[0006] In addition, in extremely cold environments, such as when the ambient temperature is no higher than minus 30°C, when using an electric heating belt to connect the water pan for defrosting, the heat required is very small, and the electric heating belt needs to work for a long time, resulting in poor defrosting effect, causing the heating capacity of the heat pump water heater or heat pump heater to drop rapidly, and in severe cases, it may even fail to work.

[0007] Another solution proposed by the prior art is to set up two condensers, one of which is used to heat water, and the other condenser is set under the water receiving tray. When defrosting is required, both condensers participate in the heating cycle to achieve defrosting. However, in this defrosting method, part of the refrigerant will not participate in the heating process and the temperature of this part of the refrigerant after defrosting is high, which can easily lead to a high return air temperature of the compressor, thereby affecting the efficiency of the heat pump.

[0008] Therefore, there is still room for improvement in the existing heat pump defrosting technology. Utility Model Content

[0009] The technical problem solved by the utility model is to provide a heat pump system which can effectively ensure the defrosting effect, thereby ensuring that the heat pump system can work normally and reduce energy consumption.

[0010] The above technical problems are solved by the following technical solutions:

[0011] A heat pump system includes a compressor, a condenser, a main expansion valve, and an evaporator connected in series to form a heat exchange circulation loop, wherein the condenser has a hot water channel; the heat pump system also includes:

[0012] A water receiving tray is provided at the bottom of the evaporator and is used to receive water dripping from the surface of the evaporator;

[0013] a defrost structure having a defrost chamber, the hot water channel being connected to the defrost chamber to form a defrost circulation loop, and the hot water flowing in the defrost chamber being used to defrost the water receiving pan;

[0014] The defrost valve is provided in the defrost circulation circuit, and the defrost valve can control the on-off of the defrost circulation circuit.

[0015] Compared with the background technology, the heat pump system described in the present invention has the following beneficial effects:

[0016] Using hot water prepared by the condenser to defrost the water pan can effectively ensure the defrosting effect without the need to set up an electric heater. This can effectively solve the problem that the defrosting function is easily invalid when using an electric heater for defrosting, ensuring that the heat pump system can work normally; it is also highly reliable and not easy to damage.

[0017] When the heat pump system is used as an outdoor product, the evaporator uses an air heat exchanger. When hot water prepared by the condenser is used to defrost the docking water pan, the heat energy required for defrosting comes partly from electricity and partly from air energy. The conversion efficiency ratio is far greater than 1, requiring less electricity to defrost the docking water pan, resulting in better economic benefits.

[0018] The heat pump system only needs to use one condenser, which not only reduces the number of condensers, reduces costs, and reduces the space occupied by the heat pump system; the refrigerant in the heat pump system is fully involved in the heating cycle, which can effectively solve the problem of high compressor return air temperature caused by part of the refrigerant not participating in the heating cycle when two condensers are set in the existing technology, thereby improving the efficiency of the heat pump system.

[0019] In one embodiment, the top of the defrost structure forms the water receiving tray; a guide plate is provided in the defrost chamber, the guide plate dividing the defrost chamber into a first sub-chamber and a second sub-chamber, one end of the first sub-chamber is connected to the return port of the hot water channel, and the other end is connected to the second sub-chamber, and the water supply port of the hot water channel is connected to the second sub-chamber;

[0020] The position where the water receiving tray contacts the bottom of the evaporator is a contact position, and the first sub-chamber is correspondingly arranged directly below the contact position.

[0021] In one embodiment, one end of the first sub-chamber is connected to one end of the second sub-chamber and is located at one end of the length direction of the evaporator, and one end of the second sub-chamber connected to the hot water channel and one end of the first sub-chamber connected to the hot water channel are both located at the other end of the length direction of the evaporator.

[0022] In one embodiment, the outer surface of the defrost structure is covered with a thermal insulation layer.

[0023] In one embodiment, the defrosting structure is a heat exchange coil, and part of the heat exchange coil is arranged between the water receiving tray and the bottom of the evaporator and is arranged in contact with the bottom of the evaporator.

[0024] In one embodiment, the defrost valve is a two-position four-way valve, which has a defrost state and an idle state. When the two-position four-way valve is in the defrost state, the water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber, and the water return port of the hot water channel is connected to the defrost water outlet of the defrost chamber; when the two-position four-way valve is in the idle state, the water supply port of the hot water channel is disconnected from the defrost water inlet of the defrost chamber, and the water return port of the hot water channel is disconnected from the defrost water outlet of the defrost chamber.

[0025] Alternatively, the defrost valve includes an inlet valve and a return valve, the water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber through the inlet valve, and the return port of the hot water channel is connected to the defrost water outlet of the defrost chamber through the return valve.

[0026] In one embodiment, the defrost water outlet is arranged on the top of the defrost structure.

[0027] In one embodiment, the heat pump system further comprises:

[0028] The defrost pump is arranged on the defrost circulation loop.

[0029] In one embodiment, the heat pump system further comprises:

[0030] a water supply temperature detection unit, configured to detect the water temperature of the water supply port of the hot water channel;

[0031] a defrost temperature detection unit, configured to detect the temperature inside the defrost chamber;

[0032] And / or, the heat pump system further comprises:

[0033] A heating return water temperature detection unit, the return water port of the hot water channel is connected to a heating return water pipe, the heating return water pipe is connected to the defrost outlet of the defrost chamber at a first preset position, and along the water flow direction in the heating return water pipe, the heating return water temperature detection unit is located upstream of the first preset position.

[0034] In one embodiment, the defrost structure has a defrost drain port communicating with the defrost chamber, and the defrost drain port is provided with a drain switch valve;

[0035] And / or, the water receiving tray is provided with a water receiving and draining outlet for discharging the water in the water receiving tray into the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of a heat pump system provided by one embodiment of the present utility model;

[0037] Figure 2 This is a partial structural diagram of a heat pump system provided by an embodiment of the present utility model;

[0038] Figure 3 is a schematic diagram of a heat pump system provided by another embodiment of the present utility model;

[0039] Figure 4 This is a flow chart of a heat pump system control method provided by an embodiment of the present utility model.

[0040] In the picture:

[0041] 1. Compressor; 2. Condenser;

[0042] 31. Main expansion valve; 32. Auxiliary expansion valve;

[0043] 4. Evaporator;

[0044] 51. Water receiving tray; 52. De-icing structure; 521. De-icing chamber; 5211. First sub-chamber; 5212. Second sub-chamber; 53. Water receiving and draining port;

[0045] 6. De-icing valve; 61. Water inlet valve; 62. Return valve;

[0046] 8. Water supply temperature detection unit; 9. De-icing temperature detection unit; 10. Drain switch valve; 20. Guide plate; 30. Economizer; 40. Four-way valve. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0048] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0049] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0051] Embodiments of the present invention provide a heat pump system that can extend the service life of the heat pump system while ensuring effective defrosting. The heat pump system can be used as a heat pump water heater or a heat pump heater. For example, the heat pump system is used as a heat pump heater.

[0052] like Figure 1 and Figure 2As shown, the heat pump system includes a compressor 1, a condenser 2, a main expansion valve 31 and an evaporator 4 which are connected in series to form a heat exchange circulation loop. The heat pump system also includes a water receiving pan 51, a defrost structure 52 and a defrost valve 6. The water receiving pan 51 is arranged at the bottom of the evaporator 4 to receive water dripping from the surface of the evaporator 4. The defrost structure 52 has a defrost chamber 521. The hot water channel is connected to the defrost chamber 521 to form a defrost circulation loop. The hot water flowing in the defrost chamber 521 is used to defrost the water receiving pan 51. The defrost valve 6 is arranged in the defrost circulation loop. The defrost valve 6 can control the on and off of the defrost circulation loop.

[0053] Specifically, the water return port of the hot water channel is connected to the defrost water outlet of the defrost chamber 521 , and the water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber 521 to form a defrost circulation loop.

[0054] The high-temperature and high-pressure refrigerant discharged from the compressor 1 flows into the condenser 2, where the refrigerant condenses and releases heat, causing the water flowing in the hot water channel of the condenser 2 to be heated and heated. The refrigerant then passes through the main expansion valve 31 and enters the evaporator 4 to absorb heat, and is then sucked into the compressor 1, thereby realizing the circulation of the refrigerant in the heat exchange cycle and completing the heating cycle of the heat pump system.

[0055] During the heating cycle of the heat pump system, if ice appears in the water receiving pan 51 and the docking water pan 51 needs to be defrosted, the defrost valve 6 is controlled to open the defrost circulation loop, and the hot water flowing out of the hot water channel of the condenser 2 enters the defrost chamber 521. The hot water in the defrost chamber 521 transfers heat to the water receiving pan 51, thereby increasing the temperature of the water receiving pan 51, thereby achieving defrost treatment for the docking water pan 51; the hot water cools down in the defrost chamber 521 and returns to the hot water channel of the condenser 2.

[0056] Using the hot water prepared by the condenser 2 to connect the water pan 51 for defrosting can effectively ensure the defrosting effect, and there is no need to set up an electric heater. It can effectively solve the problem that the defrosting function is easily invalid when using an electric heater for defrosting, and ensure that the heat pump system can work normally.

[0057] When the heat pump system is used as an outdoor product, the evaporator 4 utilizes an air heat exchanger. When hot water generated by the condenser 2 is used to defrost the docking water pan 51, the heat energy required for defrosting is derived partly from electricity and partly from air energy. This conversion efficiency ratio is far greater than 1, requiring less electricity to defrost the docking water pan 51. In contrast, when the prior art uses an electric heating tape to defrost the docking water pan 51, the heat energy required for defrosting the docking water pan 51 is entirely derived from electricity, resulting in a conversion efficiency ratio less than 1 and requiring more electricity to defrost the docking water pan 51. In comparison, the heat pump system of the present invention offers greater economic benefits when defrosting the docking water pan 51.

[0058] The heat pump system only needs to use one condenser 2, which reduces costs and reduces the space occupied by the heat pump system; the refrigerant of the heat pump system all participates in the heating cycle normally, which can effectively solve the problem of high compressor return air temperature caused by part of the refrigerant not participating in the heating cycle when two condensers are set in the existing technology, thereby improving the efficiency of the heat pump system.

[0059] In the prior art, when using electric heaters for defrosting, a 75-watt electric heating tape is generally used, which has a very low heat output. Even if the power of the electric heating tape is increased to 1000 watts, the heat energy generated is still insufficient to completely remove the frost or ice on the water receiving tray 51 in extremely low temperature environments. As the ice on the water receiving tray 51 increases, it is very easy to affect the normal heat exchange of the evaporator 4 and seriously affect the operation of the heat exchange fan used for heat exchange with the evaporator 4, especially during freezing rain, which seriously accelerates the damage of the heat pump system. In the heat pump system of the present invention, the heat energy required for defrosting the water receiving tray 51 is obtained from the hot water heated by the condenser 2. This heat energy is substantially equivalent to the heating capacity of the heat pump system. For example, a 5-horsepower heat pump system has a heating capacity of 12 kilowatts, which is 160 times that of a 75-watt system. This system can completely remove the frost or ice on the water receiving tray 51, has a good defrosting effect, is highly reliable, and is not easily damaged.

[0060] In some embodiments, a water receiving tray 51 is formed at the top of the defrost structure 52, so that the water receiving tray 51 is integrated into the defrost structure 52, making the structural components of the heat pump system simpler, reducing costs, improving the degree of integration of the heat pump system, and reducing the space occupied by the heat pump system.

[0061] Exemplarily, the defrost structure 52 is a box structure, the inner cavity of which forms the defrost chamber 521, and the top plate of which forms the water collection pan 51. Specifically, the defrost structure 52 includes a box body with an open top, and a cover plate hermetically connected to the box body to seal the top opening. The cover plate is the water collection pan 51. The connection between the box body and the cover plate can be a snap-on connection or a fastener connection, and a seal is provided between the box body and the cover plate to prevent water leakage.

[0062] In some embodiments, as Figure 1 and Figure 2 As shown, a defrost pump is provided on the defrost circulation loop.

[0063] During the heating cycle of the heat pump system, if ice appears in the water receiving pan 51 and the water receiving pan 51 needs to be defrosted, the defrost valve 6 is controlled to open the defrost circulation loop, and the defrost pump is controlled to work. After the hot water is cooled in the defrost chamber 521, it returns to the hot water channel of the condenser 2 for heat exchange and temperature increase again, so that the hot water prepared by the condenser 2 continuously enters the defrost chamber 521, and the water in the defrost chamber 521 that has been defrosted and cooled continuously returns to the hot water channel of the condenser 2, which can greatly shorten the time required for defrosting the water receiving pan 51 and improve the efficiency of melting frost in the water receiving pan 51.

[0064] It should be noted that the defrost pump can be a pump in the existing heat pump system used to deliver the hot water prepared by the condenser 2 to the user end. In this case, the pump can be installed at the water supply port of the hot water channel to reduce the number of components of the heat pump system and reduce costs; the defrost pump can also be a new pump added on the basis of the existing heat pump system. In this case, the defrost pump can be installed at the defrost water inlet of the defrost chamber 521, or on the connecting pipe between the defrost water outlet of the defrost chamber 521 and the return water outlet of the hot water channel.

[0065] In some embodiments, as Figure 2 As shown, the defrost outlet is provided at the top of the defrost structure 52. This arrangement allows the water in the defrost chamber 521 to flow back into the hot water channel through the defrost outlet after the defrost chamber 521 is filled with hot water, which helps the hot water in the defrost chamber 521 to quickly transfer heat to the water receiving pan 51, thereby improving heat transfer efficiency and heat exchange effect.

[0066] In some embodiments, the hot water channel's water supply port is used to provide hot water to users, such as for heating and / or domestic hot water, while the hot water channel's water return port serves as a heating and / or domestic hot water return port. This configuration allows the entire heat pump system to utilize only one condenser 2. This condenser 2 is used to produce both heating and / or domestic hot water, as well as hot water for defrosting, thereby reducing the number of components in the heat pump system and lowering its cost.

[0067] In some embodiments, as Figure 1 and Figure 2 As shown, the defrost valve 6 includes an inlet valve 61 and a return valve 62. The water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber 521 through the inlet valve 61, and the return water port of the hot water channel is connected to the defrost water outlet of the defrost chamber 521 through the return valve 62.

[0068] Illustratively, both the water inlet valve 61 and the water return valve 62 are electromagnetic on / off valves. During defrosting, the water inlet valve 61 is energized to connect the water supply port of the hot water channel with the defrost water inlet of the defrost chamber 521, while the water return valve 62 is energized to connect the water return port of the hot water channel with the defrost water outlet of the defrost chamber 521. To terminate defrosting, the water inlet valve 61 is de-energized to disconnect the water supply port of the hot water channel from the defrost water inlet of the defrost chamber 521, while the water return valve 62 is de-energized to disconnect the water return port of the hot water channel from the defrost water outlet of the defrost chamber 521.

[0069] In other embodiments, the defrost valve 6 can also adopt a two-position four-way valve, which has a defrost state and an idle state. When the two-position four-way valve is in the defrost state, the water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber 521 and the return water port of the hot water channel is connected to the defrost water outlet of the defrost chamber 521; when the two-position four-way valve is in the idle state, the water supply port of the hot water channel is disconnected from the defrost water inlet of the defrost chamber 521 and the return water port of the hot water channel is disconnected from the defrost water outlet of the defrost chamber 521.

[0070] Specifically, the water inlet of the two-position four-way valve is connected to the water supply port of the hot water channel, the return water port of the two-position four-way valve is connected to the return water port of the hot water channel, the first working water port of the two-position four-way valve is connected to the defrost water inlet of the defrost chamber 521, and the second working water port of the two-position four-way valve is connected to the defrost water outlet of the defrost chamber 521.

[0071] When the two-position four-way valve is in the defrosting state, the water inlet of the four-way reversing valve is connected to the first working water port of the two-position four-way valve, and the return water port of the two-position four-way valve is connected to the second working water port of the two-position four-way valve, so that the defrosting circulation circuit is opened.

[0072] When the two-position four-way valve is in idle state, the water inlet of the four-way reversing valve is disconnected from the first working water port of the two-position four-way valve, and the return water port of the two-position four-way valve is disconnected from the second working water port of the two-position four-way valve, so that the defrost circulation loop is disconnected.

[0073] In some embodiments, as Figure 1 and Figure 2 As shown, a guide plate 20 is provided in the defrost chamber 521, which divides the defrost chamber 521 into a first sub-chamber 5211 and a second sub-chamber 5212. One end of the first sub-chamber 5211 is connected to the return water port of the hot water channel, and the other end is connected to the second sub-chamber 5212. The water supply port of the hot water channel is connected to the second sub-chamber 5212; the position where the water receiving tray 51 contacts the bottom of the evaporator 4 is the contact position, and the first sub-chamber 5211 is correspondingly arranged directly below the contact position.

[0074] The hot water prepared in the condenser 2 first enters the second sub-chamber 5212 to melt the frost in the water tray 51, and then enters the first sub-chamber 5211. The evaporator 4 will absorb the heat energy in the second sub-chamber 5212, thereby improving the efficiency of the heat pump and obtaining a higher energy efficiency ratio.

[0075] The shape of the first sub-chamber 5211 is identical to the contact surface between the defrost structure 52 and the evaporator 4, which corresponds to the bottom surface of the evaporator 4. For example, the contact surface between the defrost structure 52 and the evaporator 4 is L-shaped, and the first sub-chamber 5211 is an L-shaped chamber. It should be noted that if the bottom surface of the evaporator 4 has another shape, a correspondingly shaped first sub-chamber 5211 can be provided.

[0076] For example, the defrost inlet and defrost outlet are both located on the water receiving tray 51, so that they can be connected to the water supply and return ports of the hot water channel via pipes. In other embodiments, the defrost inlet and defrost outlet can also be located on the defrost structure 52.

[0077] In some embodiments, one end of the first sub-chamber 5211 is connected to one end of the second sub-chamber 5212 and is located at one end of the length direction of the evaporator 4, and one end of the second sub-chamber 5212 connected to the hot water channel and one end of the first sub-chamber 5211 connected to the hot water channel are both located at the other end of the length direction of the evaporator 4, so as to extend the flow path of hot water in the second sub-chamber 5212 and the first sub-chamber 5211, thereby improving the heat transfer effect.

[0078] In other embodiments, the defrost structure 52 can also adopt a heat exchange coil. The defrost structure 52 is a heat exchange coil, and part of the heat exchange coil is arranged between the water receiving tray 51 and the bottom of the evaporator 4, and is arranged in contact with the bottom of the evaporator 4. The hot water circulating in the heat exchange coil is used to defrost the water receiving tray 51, and the evaporator 4 is used to further absorb the heat in the heat exchange coil, so as to fully utilize the thermal energy of the hot water circulating in the heat exchange coil.

[0079] Another part of the heat exchange coil can be set in the water receiving tray 51 and in contact with the water receiving tray 51, or the heat exchange coil can be set below the water receiving tray 51 and in contact with the water receiving tray 51, or the heat exchange coil can be wrapped around the outer periphery of the water receiving tray 51.

[0080] In some embodiments, the circumferential sidewalls and bottom wall of the defrost structure 52 are covered with a thermal insulation layer, which insulates the defrost structure 52 to prevent excessive heat from being dissipated into the air.

[0081] In some embodiments, as Figure 1 and Figure 2 As shown, the defrost structure 52 has a defrost drain port communicating with the defrost chamber 521 , and the defrost drain port is provided with a drain switch valve 10 .

[0082] After completing defrosting of the water receiving tray 51, open the drain switch valve 10, and the water in the defrost chamber 521 can be completely discharged out of the heat pump system through the defrost drain port to avoid the water in the defrost chamber 521 from freezing as the temperature drops subsequently, with high safety performance.

[0083] Exemplarily, the drain switch valve 10 is an electromagnetic switch valve. When the drain switch valve 10 is energized, the water in the defrost chamber 521 is discharged out of the heat pump system through the defrost drain outlet; when the drain switch valve 10 is de-energized, the water in the defrost chamber 521 cannot be discharged through the defrost drain outlet.

[0084] In some embodiments, a balancing valve is provided on the top of the defrost structure 52. When the water inlet valve 61 and the return valve 62 are opened and the drain on-off valve 10 is closed, air in the defrost chamber 521 can be discharged to the outside atmosphere through the balancing valve, so that hot water can be normally injected into the defrost chamber 521. When the water inlet valve 61 and the return valve 62 are closed and the drain on-off valve 10 is opened, outside air can enter the defrost chamber 521 through the exhaust valve, so that water in the defrost chamber 521 can be discharged to the outside through the drain on-off valve 10.

[0085] In some embodiments, as Figure 1 and Figure 2 As shown, the water receiving tray 51 is provided with a water receiving and draining port 53. The water in the water receiving tray 51, such as rainwater, snow water, defrost water, ice-melting water, and condensed water dripping from the surface of the evaporator 4 into the water receiving tray 51, can be completely discharged out of the heat pump system through the water receiving and draining port 53.

[0086] In some embodiments, the water receiving and draining port 53 is provided at the lowest position of the upper surface of the water receiving tray 51 , so that the water on the water receiving tray 51 can be discharged through the water receiving and draining port 53 in a timely manner.

[0087] In some embodiments, as Figure 1 and Figure 2 As shown, the heat pump system also includes an economizer 30, which has an evaporation channel and a condensation channel, wherein the evaporation channel is connected to the heat exchange circulation loop between the condenser 2 and the main expansion valve 31, the condenser 2 and the inlet of the compressor 1 are connected through an air jet enthalpy increase pipeline, and an auxiliary expansion valve 32 is provided on the air jet enthalpy increase pipeline, and the condensation channel is connected between the outlet of the auxiliary expansion valve 32 and the inlet of the compressor 1.

[0088] In some embodiments, as Figure 3As shown, the heat pump system further includes a four-way valve 40 having ports A, B, C, and D. Port A is connected to the outlet of compressor 1, port B is connected to the condensing channel of condenser 2, port C is connected to the inlet of compressor 1, and port D is connected to the evaporating channel of evaporator 4. When the heat pump system is in heating mode, ports A and B are connected, and ports C and D are connected. When the heat pump system is in cooling mode, ports A and D are connected, and ports B and C are connected.

[0089] An embodiment of the present utility model further provides a heat pump system control method, which is used for the heat pump system provided by any of the above embodiments.

[0090] The heat pump system control method includes the following steps:

[0091] When the defrost start instruction is received, the defrost valve 6 is controlled to conduct the defrost circulation loop.

[0092] When the water in the defrost circulation loop flows through the defrost chamber 521 , it can transfer heat to the water receiving tray 51 , so as to melt the frost in the water receiving tray 51 .

[0093] It should be noted that when the defrost valve 6 turns on the defrost circulation loop, the defrost pump works; if the defrost pump is a pump separately added for defrosting, then when the defrost valve 6 disconnects the defrost circulation loop, the defrost pump is controlled to stop working; if the defrost pump is a pump used in the existing heat pump system to deliver the hot water prepared by the condenser 2 to the user end, then when the defrost valve 6 disconnects the defrost circulation loop, the defrost pump is controlled to start and stop according to the hot water preparation demand of the user end.

[0094] In some embodiments, the defrost valve 6 is controlled to disconnect the defrost circuit when a user input of an end command is received; when the temperature difference between the water temperature at the hot water channel's water inlet and the temperature within the defrost chamber 521 is less than a preset end temperature difference; or when the defrost duration exceeds a preset defrost duration. In other words, the defrost valve 6 is controlled to disconnect the defrost circuit when any of the above three conditions are met.

[0095] For example, when any one of the above three conditions is met, the defrost valve 6 is controlled to disconnect the defrost circulation loop.

[0096] It should be noted that the preset end temperature difference is a known value determined through repeated testing. When the difference between the water temperature at the water inlet and the temperature within the defrost chamber 521 is less than the preset end temperature difference, it indicates that the temperature within the defrost chamber 521 has dropped significantly, and the frost and ice within the water tray 51 have essentially been removed. De-icing the water tray 51 can be discontinued. The preset defrost duration is determined through repeated testing based on a certain volume of the defrost chamber 521 and the maximum amount of ice within the water tray 51. Different volumes of the defrost chamber 521 directly affect the defrost duration. The preset end temperature difference and preset defrost duration are pre-installed in the heat pump system controller.

[0097] Specifically, the heat pump system further includes a water supply temperature detection unit 8 and a defrost temperature detection unit 9. The water supply temperature detection unit 8 is used to detect the water temperature at the water supply port, and the defrost temperature detection unit 9 is used to detect the temperature within the defrost chamber 521. Exemplarily, both the water supply temperature detection unit 8 and the defrost temperature detection unit 9 utilize temperature sensors and are electrically connected to a controller of the heat pump system. The controller is capable of receiving detection signals from the water supply temperature detection unit 8 and the defrost temperature detection unit 9 and obtaining the water temperature at the water supply port and the temperature within the defrost chamber 521 based on the obtained detection signals.

[0098] The above-mentioned defrost temperature detection unit 9 is used to detect the water temperature in the second sub-chamber 5212. In order to accurately determine the end time of stopping defrosting, the connecting position of the second sub-chamber 5212 and the first sub-chamber 5211 is closer to the defrost temperature detection unit 9 than the defrost water inlet.

[0099] In some embodiments, the defrost start instruction includes a start instruction input by a user, and / or a defrost start instruction generated when the temperature in the second sub-chamber 5212 is not higher than a preset start temperature.

[0100] The heat pump system is equipped with a display or a start button, and defrost activation instructions are input by operating the display or pressing the start button. For example, the preset start temperature is a known value determined through repeated testing and pre-installed in the heat pump system controller. The preset start temperature is less than 5°C. If the temperature within the second sub-chamber 5212 is not higher than the preset start temperature, then the temperature within the second sub-chamber 5212 is substantially equal to the ambient temperature, indicating that ice or frost has likely formed in the water tray 51 and defrosting is necessary.

[0101] In some embodiments, when the temperature in the defrost chamber 521 is lower than a preset drainage temperature, the drainage switch valve 10 is controlled to drain the water in the defrost chamber 521; and when the drainage duration reaches a preset drainage duration, the drainage switch valve 10 is controlled to stop drainage.

[0102] The preset drain temperature is determined through repeated testing. For example, if the temperature within the defrost chamber 521 falls below the preset drain temperature after defrosting has ceased, it indicates that the water within the defrost chamber 521 is at risk of freezing. Therefore, the drain valve 10 is opened to drain the water from the defrost chamber 521 out of the heat pump system. The preset drain duration is related to the volume of the defrost chamber 521. Once the volume of the defrost chamber 521 is determined, the preset drain duration is determined through repeated testing and pre-installed in the heat pump system controller. When the drain duration reaches the preset drain duration, the defrost chamber 521 is considered fully drained and further draining can cease.

[0103] In some embodiments, the return port of the hot water channel is connected to a heating return pipe, and the supply port of the heating channel is connected to a heating supply pipe. The heating hot water prepared by the condenser 2 is delivered to the heating equipment through the heating supply pipe, and the low-temperature heating water flowing out of the heating equipment returns to the condenser 2 through the heating return pipe. The heating equipment is used to meet the heating needs of the user.

[0104] The heating return water pipe is connected to the defrost outlet of the defrost chamber 521 at the first preset position. The low-temperature heating water in the heating return water pipe merges with the low-temperature water returning from the first preset position and the defrost chamber 521 and flows into the hot water channel.

[0105] The heat pump system further includes a heating return water temperature detection unit located upstream of the first preset position along the direction of water flow within the heating return water pipe. The heating return water temperature detection unit detects the heating return water temperature within the heating return water pipe. Exemplarily, the heating return water temperature detection unit is a temperature sensor.

[0106] In some embodiments, the heat pump system control method further includes the following steps:

[0107] Obtaining the heating return water temperature at a second preset position in the heating return water pipe;

[0108] When the heating return water temperature is lower than the preset minimum return water temperature, it is determined whether the operating power of the compressor 1 reaches the preset maximum power;

[0109] If the operating power of the compressor 1 does not reach the preset maximum power, the power of the compressor 1 is increased; if the operating power of the compressor 1 reaches the preset maximum power, the conduction opening of the defrosting cycle is reduced.

[0110] Along the water flow direction in the heating return pipe, the second preset position is located upstream of the first preset position of the defrost outlet of the heating return pipe connected to the defrost chamber 521. In other words, the heating return water temperature detection unit is set at the second preset position.

[0111] The degree of communication of the defrost circuit includes the degree of communication between the water supply port of the hot water channel and the defrost water inlet of the defrost chamber 521, and / or the degree of communication between the water return port of the hot water channel and the defrost water outlet of the defrost chamber 521. For example, the water inlet valve 61 is a flow regulating valve with an adjustable opening. When the degree of communication of the defrost circuit needs to be reduced, the opening of the water inlet valve 61 can be reduced.

[0112] When the heating return water temperature is lower than the preset minimum return water temperature, it means that the heating water provided by the condenser 2 cannot meet the heating demand of the heating equipment. If the operating power of the compressor 1 has not reached the preset maximum power, it is preferred to increase the operating power of the compressor 1 to deliver hot water with higher temperature to the heating equipment, so as to meet the heating demand of the heating equipment and the thermal energy demand for defrosting the docking water pan 51 as much as possible; if the operating power of the compressor 1 reaches the preset maximum power, it means that the heating demand of the heating equipment and the thermal energy demand for defrosting the docking water pan 51 cannot be met at the same time, then the conduction opening of the defrost circulation loop can be reduced to reduce the amount of hot water delivered to the defrost chamber 521, so as to deliver more hot water to the heating equipment, preferably to meet the heating demand of the heating equipment.

[0113] It should be noted that the preset minimum return water temperature is a known value determined through multiple repeated tests.

[0114] In some embodiments, before reducing the conduction opening of the defrost cycle, the method further includes: determining whether the conduction opening of the defrost cycle is greater than a preset minimum opening;

[0115] If the conduction opening of the defrost cycle is greater than a preset minimum opening, the conduction opening of the defrost cycle is reduced;

[0116] If the conduction opening of the defrost circulation circuit is not greater than the preset minimum opening, the conduction opening of the defrost circulation circuit is controlled to be maintained at the preset minimum opening.

[0117] If the operating power of the compressor 1 reaches the preset maximum power and cannot simultaneously meet the heating needs of the heating equipment and the thermal energy demand for defrosting the water pan 51, it is first determined whether the opening of the defrost circuit is greater than the preset minimum opening. If the opening of the defrost circuit is greater than the preset minimum opening, the opening of the defrost circuit can be reduced to prioritize meeting the heating needs of the heating equipment and reduce the defrosting speed of the water pan 51. If the opening of the defrost circuit is not greater than the preset minimum opening, the opening of the defrost circuit is controlled to maintain the preset minimum opening to reduce the defrosting speed of the water pan 51 while ensuring that the defrosting operation of the water pan 51 can continue.

[0118] It should be noted that the preset maximum power is the maximum allowable power when the compressor 1 is running, and the preset minimum opening is a known value determined through multiple repeated tests. The preset minimum opening is the minimum opening allowed for defrosting the water tray 51. Once the conduction opening of the defrosting cycle is less than the preset minimum opening, the defrosting speed of the water tray 51 will be too low, which will seriously affect the normal operation of the heat pump system and increase the energy consumption of the heat pump system.

[0119] The heat pump system control method provided by the embodiment of the present utility model has two automatic defrost modes and a manual defrost mode. Figure 4 The working process of the heat pump system control method according to one embodiment of the present invention is introduced.

[0120] S1. When receiving the defrost start command, the water inlet valve 61 and the water return valve 62 are controlled to open to connect the defrost circulation circuit, and the drain switch valve 10 is closed;

[0121] S2. Determine whether the defrost function shut-down condition is met. If so, execute S3; if not, execute S4.

[0122] S3, controlling the defrost valve 6 to disconnect the defrost circulation loop, and then executing S9;

[0123] S4. Obtaining the heating return water temperature at a second preset position in the heating return water pipe;

[0124] S5. Determine whether the heating return water temperature is lower than the preset minimum return water temperature. If so, execute S6; if not, return to S2;

[0125] S6, determining whether the operating power of the compressor 1 reaches the preset maximum power, if not, executing S7; if yes, executing S8;

[0126] S7, increase the power of compressor 1, and return to S2;

[0127] S8, determining whether the conduction opening of the defrost cycle is greater than a preset minimum opening; if so, executing S9; if not, executing S10;

[0128] S9, reducing the conduction opening of the defrost cycle and returning to S2;

[0129] S10, controlling the conduction opening of the defrost cycle to maintain at a preset minimum opening, and then returning to S2;

[0130] S11. When the temperature in the defrost chamber 521 is lower than the preset drainage temperature, the drainage switch valve 10 is opened to drain the water in the defrost chamber 521; and when the drainage duration reaches the preset drainage duration, the drainage switch valve 10 is closed to stop drainage.

[0131] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A heat pump system comprising a compressor (1), a condenser (2), a main expansion valve (31) and an evaporator (4) connected in series to form a heat exchange circulation loop, wherein the condenser (2) has a hot water channel; characterized in that: The heat pump system further comprises: A water receiving tray (51) is provided at the bottom of the evaporator (4) and is used to receive water dripping from the surface of the evaporator (4); A defrosting structure (52), the defrosting structure (52) having a defrosting chamber (521), the hot water channel being connected to the defrosting chamber (521) to form a defrosting circulation loop, and the hot water flowing in the defrosting chamber (521) being used to defrost the water receiving tray (51); A defrost valve (6) is provided in the defrost circulation circuit, and the defrost valve (6) can control the on-off of the defrost circulation circuit.

2. The heat pump system according to claim 1, characterized in that The top end of the defrost structure (52) forms the water receiving tray (51); a guide plate (20) is provided in the defrost chamber (521), and the guide plate (20) divides the defrost chamber (521) into a first sub-chamber (5211) and a second sub-chamber (5212); one end of the first sub-chamber (5211) is connected to the return water port of the hot water channel, and the other end is connected to the second sub-chamber (5212); the water supply port of the hot water channel is connected to the second sub-chamber (5212); The position where the water receiving tray (51) contacts the bottom of the evaporator (4) is the contact position, and the first sub-chamber (5211) is correspondingly arranged directly below the contact position.

3. The heat pump system according to claim 2, characterized in that One end of the first sub-chamber (5211) is connected to one end of the second sub-chamber (5212) and is located at one end of the length direction of the evaporator (4); one end of the second sub-chamber (5212) is connected to the hot water channel, and one end of the first sub-chamber (5211) is connected to the hot water channel, both of which are located at the other end of the length direction of the evaporator (4).

4. The heat pump system according to claim 1, characterized in that The circumferential side walls and / or bottom wall of the defrost structure (52) are covered with a heat-insulating layer.

5. The heat pump system according to claim 1, characterized in that The defrosting structure (52) is a heat exchange coil, and part of the heat exchange coil is arranged between the water receiving tray (51) and the bottom of the evaporator (4), and is arranged in contact with the bottom of the evaporator (4).

6. The heat pump system according to claim 1, characterized in that The defrost valve (6) is a two-position four-way valve, and the two-position four-way valve has a defrost state and an idle state. When the two-position four-way valve is in the defrost state, the water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber (521), and the water return port of the hot water channel is connected to the defrost water outlet of the defrost chamber (521); when the two-position four-way valve is in the idle state, the water supply port of the hot water channel is disconnected from the defrost water inlet of the defrost chamber (521), and the water return port of the hot water channel is disconnected from the defrost water outlet of the defrost chamber (521); Alternatively, the defrost valve (6) includes a water inlet valve (61) and a water return valve (62), the water supply port of the hot water channel is connected to the defrost water inlet of the defrost chamber (521) through the water inlet valve (61), and the water return port of the hot water channel is connected to the defrost water outlet of the defrost chamber (521) through the water return valve (62).

7. The heat pump system according to claim 6, characterized in that The defrost water outlet is arranged on the top of the defrost structure (52).

8. The heat pump system according to any one of claims 1 to 7, characterized in that: The heat pump system further comprises: The defrost pump is arranged on the defrost circulation loop.

9. The heat pump system according to any one of claims 1 to 7, characterized in that: The heat pump system further comprises: a water supply temperature detection unit (8), used for detecting the water temperature of the water supply port of the hot water channel; a defrost temperature detection unit (9) for detecting the temperature in the defrost chamber (521); And / or, the heat pump system further comprises: A heating return water temperature detection unit, wherein the return water port of the hot water channel is connected to a heating return water pipe, and the heating return water pipe is connected to the defrost outlet of the defrost chamber (521) at a first preset position. Along the water flow direction in the heating return water pipe, the heating return water temperature detection unit is located upstream of the first preset position.

10. The heat pump system according to any one of claims 1 to 7, characterized in that: The defrost structure (52) has a defrost drain port communicating with the defrost chamber (521), and the defrost drain port is provided with a drain switch valve (10); And / or, the water receiving tray (51) is provided with a water receiving and draining outlet (53) for discharging the water in the water receiving tray (51) into the external environment.

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