Air source heat pump equipment

Abstract

The utility model discloses an air source heat pump device comprising: a compressor, a first heat exchanger, a defrost heat exchange pipe group, a first temperature sensor, a second temperature sensor, a defrost valve and a controller; the defrost heat exchange pipe group comprises a first coil and a second coil. During the defrosting process, the first discharge port of the compressor outputs a medium substance. Due to the physical properties of the medium substance, a large amount of the medium substance will flow through the first coil, resulting in insufficient flow in the second coil, thereby causing uneven defrosting at the upper and lower ends of the first heat exchanger. The controller receives the first temperature parameter and the second temperature parameter to adjust the opening and closing of the defrost valve and switch the operating frequency of the compressor in real time, thereby controlling the flow of the medium substance flowing through the first coil and the second coil in real time, so as to ensure uniform defrosting of the first heat exchanger, avoid heat waste, and achieve efficient defrosting.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps and air conditioning equipment, and in particular to air source heat pump equipment. Background Art

[0002] With the gradual expansion of the application scope of coal-to-electricity conversion in the north, large air-cooled heat pumps are being used more and more widely in the heating market. At the same time, the market demand for the single-unit capacity of large air-cooled heat pumps is also showing a trend of gradual increase, resulting in the increasing size of finned heat exchangers, which poses a huge challenge to defrosting under low ambient temperature, especially low temperature and high humidity conditions.

[0003] In the prior art, since high-temperature and high-pressure gaseous media are very easy to accumulate in the upper part of the finned heat exchanger, the defrosting energy is concentrated on the upper part, resulting in the upper part of the finned heat exchanger being defrosted quickly, and even causing a system high-pressure alarm, but the lower part is not defrosted thoroughly. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect of uneven defrosting efficiency in the prior art, which leads to incomplete defrosting of the lower part of the fin, thereby providing an air source heat pump device.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] An air source heat pump device, characterized in that it includes: a compressor, a first heat exchanger, a defrost heat exchange pipe group, a first temperature sensor, a second temperature sensor, a defrost valve, and a controller; the defrost heat exchange pipe group includes a first coil and a second coil, the first coil is wound around the upper part of the first heat exchanger, the second coil is wound around the lower part of the first heat exchanger, and the first coil and the second coil are not connected to each other; one end of the first coil and the second coil are both connected to the first discharge port of the compressor, and a medium flows through the first coil and the second coil respectively to perform heat exchange and defrosting on the first heat exchanger; a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged on the first coil to monitor the first temperature parameter of the first coil; the second temperature sensor is arranged on the second coil to monitor the second temperature parameter of the second coil; the defrost valve is arranged at the other end of the first coil; the controller is suitable for receiving the first temperature parameter to control the start or close of the defrost valve; the controller is suitable for receiving the second temperature parameter to control the switching working frequency of the compressor.

[0007] According to some embodiments of the present utility model, the defrost heat exchange tube group further includes a liquid inlet main pipe and a reflux main pipe, one end of the liquid inlet main pipe is connected to the first discharge port of the compressor, and at least two liquid outlets are provided on the liquid inlet main pipe, and one end of the first coil and the second coil are respectively connected to the liquid outlets;

[0008] The other ends of the first coil and the second coil are connected to one end of the return main pipe through a three-way joint, and the other end of the return main pipe is connected to the air inlet of the compressor to return the medium to the compressor.

[0009] According to some embodiments of the utility model, the air source heat pump device also includes a first reversing valve and a second heat exchanger, the first reversing valve is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first reversing valve is communicatively connected to the controller, the first valve port is connected to the first discharge port of the compressor, the second valve port is connected to the first heat exchanger through the liquid inlet main pipe, the third valve port is connected to the air inlet of the compressor, and the fourth valve port is connected to the second heat exchanger; the controller controls the steering of the first reversing valve so that the compressor, the second heat exchanger and the first heat exchanger are connected to form a heating circuit; and the compressor, the first heat exchanger and the second heat exchanger are connected to form a refrigeration circuit; in the heating circuit state, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port; in the refrigeration circuit state, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port.

[0010] According to some embodiments of the present invention, the first heat exchanger is an evaporator, the second heat exchanger is a condenser, and one end of the second heat exchanger is connected to an external thermal component through a water supply pipe.

[0011] According to some embodiments of the present utility model, a gas-liquid separator is provided on the pipeline connecting the third valve port to the air inlet of the compressor.

[0012] According to some embodiments of the utility model, an economizer and a second reversing valve are provided between the reflux main pipe and the second heat exchanger, and the reversing valve is provided with a first interface, a second interface, a third interface and a fourth interface; the economizer is provided with a first inlet, a second inlet, a first outlet and a second outlet; the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet;

[0013] The first interface is connected to the other end of the reflux main pipe, the second interface is connected to the first inlet, the third interface is connected to the second heat exchanger, the fourth interface is connected to the first outlet, the second inlet is connected to the second discharge port of the compressor, and the second outlet is connected to the first outlet.

[0014] According to some embodiments of the present utility model, the second reversing valve includes: a first one-way valve and a second one-way valve arranged in series, a third one-way valve and a fourth one-way valve arranged in series, the first one-way valve and the second one-way valve are arranged in reverse, and the third one-way valve and the fourth one-way valve are arranged in reverse; the first one-way valve and the third one-way valve are arranged in one direction, and the fourth one-way valve and the second one-way valve are arranged in reverse;

[0015] The first interface is located between the first one-way valve and the fourth one-way valve, the second interface is located between the first one-way valve and the second one-way valve, the third interface is located between the second one-way valve and the third one-way valve, and the fourth interface is located between the third one-way valve and the fourth one-way valve.

[0016] According to some embodiments of the utility model, an expansion valve group is provided between the second outlet and the first outlet, and the expansion valve group includes an enthalpy increasing valve, a filter and an auxiliary expansion valve arranged in sequence; a main expansion valve is provided between the fourth interface and the first outlet.

[0017] According to some embodiments of the utility model, a fan is further included. The fan is communicatively connected with the controller. The fan is arranged opposite to the first heat exchanger. In the heating circuit state, the controller controls the fan to start.

[0018] The technical solution of the utility model has the following advantages:

[0019] The utility model provides an air source heat pump device, wherein the defrost heat exchange pipe group includes a first coil and a second coil. The first coil and the second coil are respectively wound around the upper and lower parts of the first heat exchanger, a first temperature sensor is provided on the first coil, and a second temperature sensor is provided on the second coil. The first temperature sensor is used to monitor a first temperature parameter in the first coil, and the second temperature sensor is used to monitor a second temperature parameter in the second coil. During the defrosting process, a first discharge port of the compressor outputs a medium substance, and the medium substance passes through the first coil and the second coil to defrost the first heat exchanger. Due to the physical properties of the medium substance, a large amount of the medium substance will flow through the first coil, resulting in insufficient flow in the second coil, thereby resulting in uneven defrosting of the upper and lower ends of the first heat exchanger. The controller receives the first temperature parameter and the second temperature parameter to adjust the opening and closing of the defrost valve in real time and switch the working frequency of the compressor, thereby controlling the flow of the medium substance flowing through the first coil and the second coil in real time to ensure uniform defrosting of the first heat exchanger, avoid heat waste, and achieve efficient defrosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an air source heat pump device provided in some embodiments of the utility model;

[0022] Figure 2 This is a defrost control flow chart of an air source heat pump device provided in some embodiments of the present utility model.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. compressor; 2. first heat exchanger; 3. second heat exchanger; 4. first coil; 5. second coil; 6. first temperature sensor; 7. second temperature sensor; 8. defrost valve; 9. liquid inlet main pipe; 10. reflux main pipe; 11. first reversing valve; 12. gas-liquid separator; 13. second reversing valve; 14. economizer; 15. expansion valve group; 16. main expansion valve; 17. fan; 131. first non-return valve; 132. second non-return valve; 133. third non-return valve; 134. fourth non-return valve; 151. enthalpy increase valve; 152. filter; 153. auxiliary expansion valve. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Reference Figure 1As shown, the utility model proposes an air source heat pump device, including: a compressor 1, a first heat exchanger 2, a defrosting heat exchange pipe group, a first temperature sensor 6, a second temperature sensor 7, a defrosting valve 8 and a controller; the defrosting heat exchange pipe group includes a first coil 4 and a second coil 5, the first coil 4 is wound around the upper part of the first heat exchanger 2, the second coil 5 is wound around the lower part of the first heat exchanger 2, and the first coil 4 and the second coil 5 are not connected to each other; one end of the first coil 4 and the second coil 5 are both connected to the first discharge port of the compressor 1, and the medium flows through the first The coil 4 and the second coil 5 are used to perform heat exchange and defrost the first heat exchanger 2; the first temperature sensor 6 and the second temperature sensor 7, the first temperature sensor 6 is arranged on the first coil 4, so as to be suitable for monitoring the first temperature parameter of the first coil 4; the second temperature sensor 7 is arranged on the second coil 5, so as to be suitable for monitoring the second temperature parameter of the second coil 5; the defrost valve 8 is arranged at the other end of the first coil 4; the controller is suitable for receiving the first temperature parameter to control the start or close of the defrost valve 8, and the controller is suitable for receiving the second temperature parameter to control the working frequency of the compressor 1.

[0029] Specifically, the defrosting heat exchange tube group includes a first coil 4 and a second coil 5. The first coil 4 and the second coil 5 are respectively wound around the upper and lower parts of the first heat exchanger 2. A first temperature sensor 6 is provided on the first coil 4, and a second temperature sensor 7 is provided on the second coil 5. The first temperature sensor 6 is used to monitor the first temperature parameter in the first coil 4, and the second temperature sensor 7 is used to monitor the second temperature parameter in the second coil 5. During the defrosting process, the first discharge port of the compressor 1 outputs a medium substance, and the medium substance passes through the first coil 4 and the second coil 5 to defrost the first heat exchanger 2. Due to the physical properties of the medium substance, the medium substance will flow through the first coil 4 in large quantities, resulting in insufficient flow in the second coil 5, thereby resulting in uneven defrosting at the upper and lower ends of the first heat exchanger 2. The controller receives the first temperature parameter and the second temperature parameter to adjust the opening and closing of the defrost valve 8 and the operating frequency of the compressor 1 in real time, thereby controlling the flow of the medium substance flowing through the first coil 4 and the second coil 5 in real time to ensure uniform defrosting of the first heat exchanger 2, avoid heat waste, and achieve efficient defrosting.

[0030] It can be understood that the first heat exchanger 2 is a finned evaporator, the first coil 4 and the second coil 5 are respectively arranged on the upper and lower parts of the first heat exchanger 2, and the first coil 4 and the second coil 5 are not connected to each other. Due to the physical characteristics of the gaseous medium, the medium with high temperature and high pressure flows upward and is easy to gather in the first coil 4. Therefore, during the defrosting process, the first coil 4 is easy to maintain a high temperature, and the upper part of the first heat exchanger 2 will be defrosted in a short time. In some embodiments of the present invention, by respectively arranging the first temperature sensor 6 and the second temperature sensor 7 on the first coil 4 and the second coil 5, the first temperature sensor The sensor 6 is used to monitor the first temperature parameter of the first coil 4. When the second temperature parameter of the first coil 4 exceeds the preset temperature, the controller controls the defrost valve 8 at the other end of the first coil 4 to close, so that the medium cannot flow through the first coil 4. Due to the output pressure of the compressor 1, a large amount of medium can only flow through the second coil 5, thereby defrosting the lower part of the first heat exchanger 2. The second temperature sensor 7 is used to monitor the second temperature parameter of the second coil 5. When the second temperature parameter exceeds the preset temperature, the controller controls the compressor 1 to stop outputting high-temperature and high-pressure medium, thereby completing the defrosting operation of the first heat exchanger 2.

[0031] In some embodiments of the present utility model, the defrosting heat exchange tube group further includes a liquid inlet main pipe 9 and a reflux main pipe 10, one end of the liquid inlet main pipe 9 is connected to the first discharge port of the compressor 1, and at least two liquid outlets are provided on the liquid inlet main pipe 9, and one end of the first coil 4 and the second coil 5 are respectively connected to the liquid outlets;

[0032] The other ends of the first coil 4 and the second coil 5 are both connected to one end of the return main pipe 10 through a three-way joint, and the other end of the return main pipe 10 is connected to the air inlet of the compressor 1 to be suitable for returning the medium to the compressor 1.

[0033] Specifically, one end of the liquid inlet main pipe 9 is connected to the first discharge port of the compressor 1, and at least two liquid outlets are provided on the liquid inlet main pipe 9. One end of the first coil 4 and the second coil 5 are respectively connected to any liquid outlet. The high-temperature and high-pressure medium material is discharged from the first discharge port, flows through the liquid inlet main pipe 9, and then flows through the first coil 4 and the second coil 5 from the liquid outlet respectively; the other ends of the first coil 4 and the second coil 5 are connected to one end of the reflux main pipe 10 through a three-way joint, and the other end of the first coil 4 is provided with a defrost valve 8, and the medium material is recovered through the three-way joint. In the initial stage of defrosting, both the upper and lower parts of the first heat exchanger 2 have not completed defrosting, and the medium flows through the first coil 4 and the second coil 5 respectively, converges at the three-way joint, and flows back from the air inlet of the compressor 1 to the compressor 1 through the return main pipe 10; when the first temperature parameter is greater than or equal to the preset temperature, the defrost valve 8 is closed, and the medium flows from the second coil 5, the three-way joint, the return main pipe 10, and flows back from the air inlet of the compressor 1 to the compressor 1. By setting the inlet main pipe 9 and the return main pipe 10, the layout of the pipelines is reduced, the compactness of the structure is ensured, and the difficulty of maintenance is reduced.

[0034] In some embodiments of the utility model, the air source heat pump device also includes a first reversing valve 11 and a second heat exchanger 3. The first reversing valve 11 is provided with a first valve port, a second valve port, a third valve port and a fourth valve port. The first reversing valve 11 is communicatively connected to the controller, the first valve port is connected to the first discharge port of the compressor 1, the second valve port is connected to the first heat exchanger 2 through the liquid inlet main pipe 9, the third valve port is connected to the air inlet of the compressor 1, and the fourth valve port is connected to the second heat exchanger 3; the controller controls the steering of the first reversing valve 11 so that the compressor 1, the second heat exchanger 3, and the first heat exchanger 2 are connected to form a heating circuit; and the compressor 1, the first heat exchanger 2 and the second heat exchanger 3 are connected to form a cooling circuit; in the heating circuit state, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port; in the cooling circuit state, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port.

[0035] Specifically, the first reversing valve 11 is an electric four-way reversing valve, the first valve port is connected to the first discharge port of the compressor 1, the second valve port is connected to the first heat exchanger 2, the third valve port is connected to the air inlet of the compressor 1, and the fourth valve port is connected to the second heat exchanger 3. The valve direction of the first reversing valve 11 is controlled by the controller to rotate, so that when the first valve port is connected to the fourth valve port and the second valve port is connected to the third valve port, the compressor 1, the second heat exchanger 3, and the first heat exchanger 2 are connected to form a heating circuit, so that hot water is prepared in the heating mode; when the controller controls the first reversing valve 11 to rotate, so that the first valve port is connected to the second valve port and the third valve port is connected to the fourth valve port, the compressor 1, the first heat exchanger 2 and the second heat exchanger 3 are connected to form a refrigeration circuit. At this time, the first heat exchanger 2 can be heated and defrosted, so that the second heat exchanger 3 prepares cold water in the refrigeration mode.

[0036] Specifically, the switching between the heating mode and the cooling mode is achieved through the first commutator, while ensuring that in the cooling mode, the first heat exchanger 2 can be defrosted to reduce energy consumption.

[0037] In some embodiments of the present invention, the first heat exchanger 2 is an evaporator, the second heat exchanger 3 is a condenser, and one end of the second heat exchanger 3 is connected to an external thermal component through a water supply pipe.

[0038] It can be understood that the first heat exchanger 2 is an evaporator, specifically a finned evaporator. In the heating mode, the first heat exchanger 2 cools and dissipates the heat of the medium, and the second heat exchanger 3 is a condenser.

[0039] In some embodiments of the present invention, a gas-liquid separator 12 is provided on the pipeline connecting the third valve port to the air inlet of the compressor 1 .

[0040] Specifically, by providing the gas-liquid separator 12 , it is ensured that the medium material entering the compressor 1 is dry gaseous, so as to ensure the normal operation of the compressor 1 and extend the service life of the compressor 1 .

[0041] In some embodiments of the utility model, an economizer 14 and a second reversing valve 13 are provided between the return main pipe 10 and the second heat exchanger 3, and the reversing valve is provided with a first interface, a second interface, a third interface and a fourth interface; the economizer 14 is provided with a first inlet, a second inlet, a first outlet and a second outlet; the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet;

[0042] The first interface is connected to the other end of the reflux main pipe 10, the second interface is connected to the first inlet, the third interface is connected to the second heat exchanger 3, the fourth interface is connected to the first outlet, the second inlet is connected to the second discharge outlet of the compressor 1, and the second outlet is connected to the first outlet.

[0043] Specifically, a liquid storage device is provided between the second interface and the first inlet. The economizer 14 is a shell and tube heat exchanger, and the second reversing valve 13 is a one-way valve group.

[0044] In some embodiments of the present utility model, the second reversing valve 13 includes: a first one-way valve 131 and a second one-way valve 132 arranged in series, a third one-way valve 133 and a fourth one-way valve 134 arranged in series, the first one-way valve 131 and the second one-way valve 132 are arranged in reverse, and the third one-way valve 133 and the fourth one-way valve 134 are arranged in reverse; the first one-way valve 131 and the third one-way valve 133 are arranged in one direction, and the fourth one-way valve 134 and the second one-way valve 132 are arranged in reverse;

[0045] The first interface is located between the first one-way valve 131 and the fourth one-way valve 134 , the second interface is located between the first one-way valve 131 and the second one-way valve 132 , the third interface is located between the second one-way valve 132 and the third one-way valve 133 , and the fourth interface is located between the third one-way valve 133 and the fourth one-way valve 134 .

[0046] Specifically, the first one-way valve 131 and the second one-way valve 132 are arranged in series, and the valve directions of the first one-way valve 131 and the second one-way valve 132 are opposite, the third one-way valve 133 and the fourth one-way valve 134 are arranged in series, and the valve directions of the third one-way valve 133 and the fourth one-way valve 134 are opposite, the valve directions of the first one-way valve 131 and the third one-way valve 133 are consistent, and the valve directions of the second one-way valve 132 and the fourth one-way valve 134 are consistent;

[0047] In the heating mode, the medium substance of high temperature and high pressure flows out from the first outlet, flows through the second heat exchanger 3, flows through the second one-way valve 132, flows through the second interface, flows through the liquid storage tank, and enters from the first inlet of the economizer 14. The first inlet is connected with the first outlet. The medium substance flows through the first outlet, the fourth interface, and the fourth one-way valve 134. After flowing through the return main pipe 10 from the first interface, it flows through the first coil 4 and the second coil 5 respectively. After passing through the first heat exchanger 2, it flows back to the compressor 1 from the air inlet. At the same time, the medium substance is discharged from the second outlet of the compressor 1, flows through the second inlet, through the second outlet, and converges to the first outlet. It flows through the fourth interface and the fourth one-way valve 134. After flowing through the return main pipe 10 from the first interface, it flows through the first coil 4 and the second coil 5 respectively. After passing through the first heat exchanger 2, it flows back to the compressor 1 from the air inlet.

[0048] In the refrigeration mode, the medium with high temperature and high pressure flows out from the first discharge port, flows through the first heat exchanger 2, enters the second reversing valve group 13 from the first interface, passes through the first non-return valve 131, flows out from the second interface, passes through the liquid storage tank, enters from the first inlet of the economizer 14, and flows out from the first outlet; at the same time, the medium with high temperature and high pressure is discharged from the second discharge port, enters from the second inlet of the economizer 14, and flows out from the second outlet. The two streams of medium flow into the second reversing valve group 13 from the fourth interface, flow through the fourth non-return valve 134, flow out from the fourth interface, pass through the second heat exchanger 3, realize cold water preparation, and then flow back to the compressor 1 through the gas-liquid separator 12.

[0049] The temperature cooling and pressure change of the medium are achieved through the second reversing valve group 13 and the economizer 14 to ensure the normal operation of the cooling mode and the heating mode. Specifically, the flow direction of the medium is controlled by setting the valve direction and connection of the first one-way valve 131, the second one-way valve 132, the third one-way valve 133 and the fourth one-way valve 134 in the second reversing valve group 13, thereby improving the degree of automation and reducing the control difficulty.

[0050] In some embodiments of the utility model, an expansion valve group 15 is provided between the second outlet and the first outlet, and the expansion valve group 15 includes an enthalpy increasing valve 151, a filter 152 and an auxiliary expansion valve 153 arranged in sequence; a main expansion valve 16 is provided between the fourth interface and the first outlet.

[0051] In some embodiments of the present invention, a fan 17 is further included. The fan 17 is in communication connection with the controller. The fan 17 is arranged opposite to the first heat exchanger 2. In the heating circuit state, the controller controls the fan 17 to start.

[0052] Specifically, in the cooling mode, the fan 17 is turned off, and in the heating mode, the fan 17 is turned on to cool the medium, thereby avoiding frost on the first heat exchanger 2 and improving the defrosting efficiency.

[0053] The utility model also proposes a defrosting control method for air source heat pump equipment, comprising the following steps:

[0054] Outputting a defrost instruction, the controller controls the reversing valve to reversing, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port;

[0055] The first temperature sensor 6 and the second temperature sensor 7 monitor the first temperature parameter of the first coil 4 and the second temperature parameter of the second coil 5 respectively, and feed back the first temperature parameter and the second parameter to the controller in real time;

[0056] The controller receives a first temperature parameter and a second temperature parameter, and when the first temperature parameter is greater than a preset temperature, the controller controls the defrost valve 8 to close;

[0057] When the second temperature parameter is greater than the preset temperature, the controller controls the fan 17 to start, the compressor 1 drops to the valve cutting frequency, the controller controls the reversing valve to turn, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.

[0058] Specifically, after outputting the defrost instruction, the controller controls the reversing valve to reverse, so that the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port; the first temperature sensor 6 and the second temperature sensor 7 respectively monitor the first temperature parameter of the first coil 4 and the second temperature parameter of the second coil 5, and feed back the first temperature parameter and the second parameter to the controller in real time; the controller receives the first temperature parameter and the temperature parameter, and when the first temperature parameter is greater than the preset temperature, the controller controls the defrost valve 8 to close; when the second temperature parameter is greater than the preset temperature, the controller controls the fan 17 to start, the compressor 1 is reduced to the valve cutting frequency, the controller controls the reversing valve to turn, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port, and defrosting is completed. The defrosting control method is simple, can achieve uniform defrosting of the first heat exchanger 2, reduce energy consumption loss, and improve defrosting efficiency.

[0059] Reference Figure 2 As shown, it can be understood that the defrosting operation is performed in the refrigeration mode, and the defrosting operation is divided into three control stages, namely the first control stage, the second control stage and the third control stage. In the first control stage, the defrosting valve 8 is in an open state. At this time, the heat pump device is in the refrigeration mode. The medium of high temperature and high pressure flows out from the compressor 1, passes through the first coil 4 and the second coil 5, so as to defrost the first heat exchanger 2. When the first temperature sensor 6 monitors the first temperature parameter of the first coil 4 in real time, until the first temperature parameter is greater than or equal to the preset temperature, the controller controls the defrosting valve 8 to close. At this time, the upper part of the first heat exchanger 2 is defrosted, and the first control stage ends;

[0060] When the defrost valve 8 is closed, the second control stage is entered. At this time, the high-temperature and high-pressure medium only flows through the second coil 5 to defrost the lower part of the first heat exchanger 2. The second temperature sensor 7 monitors the second temperature parameter of the second coil 5 in real time until the second temperature parameter is greater than or equal to the preset temperature. The second control stage is completed and the third control stage is entered. At this time, the compressor 1 drops to the valve cutting frequency, the controller controls the first reversing valve 11 to switch the valve direction, starts the fan 17, and the compressor 1 increases the frequency for heating. The third control stage is completed, the defrosting operation is completed, and the heating mode is entered.

[0061] It is understandable that since the defrosting process requires the compressor 1 to be at a higher frequency to drive the circulation of the medium in the system, the compressor 1 needs to be reduced to the valve cutting frequency after the defrosting is completed to avoid the high frequency from causing a greater impact on the first reversing valve 11. After the compressor 1 is reduced to the valve cutting frequency, the first reversing valve 11 is electrically reversed, and then the fan 17 is started. It should be noted that the fan 17 can be started before the compressor 1 is reduced to the valve cutting frequency, which can optimize the high pressure problem during the defrosting process.

[0062] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An air source heat pump device, characterized in that: include: Compressor (1); A first heat exchanger (2); A defrosting heat exchange tube group, comprising a first coil (4) and a second coil (5), wherein the first coil (4) is wound around the upper part of the first heat exchanger (2), and the second coil (5) is wound around the lower part of the first heat exchanger (2), and the first coil (4) and the second coil (5) are not connected to each other; one end of the first coil (4) and the second coil (5) are both connected to a first discharge port of the compressor (1), and a medium flows through the first coil (4) and the second coil (5) respectively to perform heat exchange and defrosting on the first heat exchanger (2); a first temperature sensor (6) and a second temperature sensor (7), wherein the first temperature sensor (6) is arranged on the first coil (4) to monitor a first temperature parameter of the first coil (4); and the second temperature sensor (7) is arranged on the second coil (5) to monitor a second temperature parameter of the second coil (5); a defrost valve (8), the defrost valve (8) being arranged at the other end of the first coil (4); A controller is provided, wherein the controller is adapted to receive the first temperature parameter to control the start or close of the defrost valve (8), and the controller is adapted to receive the second temperature parameter to control the compressor (1) to switch the operating frequency.

2. The air source heat pump device according to claim 1, characterized in that: The defrosting heat exchange tube group further comprises a liquid inlet main pipe (9) and a return main pipe (10), one end of the liquid inlet main pipe (9) is in communication with a first discharge port of the compressor (1), the liquid inlet main pipe (9) is provided with at least two liquid outlets, one end of the first coil (4) and one end of the second coil (5) are respectively in communication with the liquid outlets; The other ends of the first coil (4) and the second coil (5) are connected to one end of the return main pipe (10) through a three-way joint, and the other end of the return main pipe (10) is connected to the air inlet of the compressor (1) so as to be suitable for returning the medium to the compressor (1).

3. The air source heat pump device according to claim 2, characterized in that: It also comprises a first reversing valve (11) and a second heat exchanger (3), wherein the first reversing valve (11) is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first reversing valve (11) is communicatively connected to the controller, the first valve port is connected to a first discharge port of the compressor (1), the second valve port is connected to the first heat exchanger (2) via the liquid inlet main pipe (9), the third valve port is connected to an air inlet of the compressor (1), and the fourth valve port is connected to the second heat exchanger (3); The controller controls the first reversing valve (11) to turn in a direction so that the compressor (1), the second heat exchanger (3), and the first heat exchanger (2) are connected to form a heating circuit; and the compressor (1), the first heat exchanger (2), and the second heat exchanger (3) are connected to form a cooling circuit; In the heating circuit state, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port; in the refrigeration circuit state, the first valve port is communicated with the second valve port, and the third valve port is communicated with the fourth valve port.

4. The air source heat pump device according to claim 3, characterized in that: The first heat exchanger (2) is an evaporator, the second heat exchanger (3) is a condenser, and one end of the second heat exchanger (3) is connected to an external thermal component via a water supply pipeline.

5. The air source heat pump device according to claim 3, characterized in that: A gas-liquid separator (12) is provided on the pipeline connecting the third valve port to the air inlet of the compressor (1).

6. The air source heat pump device according to claim 3, characterized in that: An economizer (14) and a second reversing valve (13) are provided between the return main pipe (10) and the second heat exchanger (3); the reversing valve is provided with a first interface, a second interface, a third interface and a fourth interface; the economizer (14) is provided with a first inlet, a second inlet, a first outlet and a second outlet; the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet; The first interface is connected to the other end of the return main pipe (10), the second interface is connected to the first inlet, the third interface is connected to the second heat exchanger (3), the fourth interface is connected to the first outlet, the second inlet is connected to the second discharge outlet of the compressor (1), and the second outlet is connected to the first outlet.

7. The air source heat pump device according to claim 6, characterized in that: The second reversing valve (13) comprises: a first one-way valve (131) and a second one-way valve (132) arranged in series, and a third one-way valve (133) and a fourth one-way valve (134) arranged in series, wherein the first one-way valve (131) and the second one-way valve (132) are arranged in opposite directions, and the third one-way valve (133) and the fourth one-way valve (134) are arranged in opposite directions; the first one-way valve (131) and the third one-way valve (133) are arranged in one direction, and the fourth one-way valve (134) and the second one-way valve (132) are arranged in opposite directions; The first interface is located between the first one-way valve (131) and the fourth one-way valve (134), the second interface is located between the first one-way valve (131) and the second one-way valve (132), the third interface is located between the second one-way valve (132) and the third one-way valve (133), and the fourth interface is located between the third one-way valve (133) and the fourth one-way valve (134).

8. The air source heat pump device according to claim 6, characterized in that: An expansion valve group (15) is provided between the second outlet and the first outlet, and the expansion valve group (15) comprises an enthalpy increasing valve (151), a filter (152) and an auxiliary expansion valve (153) which are arranged in sequence; a main expansion valve (16) is provided between the fourth interface and the first outlet.

9. The air source heat pump device according to claim 3, characterized in that: It also includes a fan (17), the fan (17) is in communication connection with the controller, the fan (17) is arranged opposite to the first heat exchanger (2), and in the heating circuit state, the controller controls the fan (17) to start.

Images