Heat pump anti-freezing device with water pan and operation method of heat pump anti-freezing device

Abstract

According to the heat pump anti-freezing device with the water pan and the control method of the heat pump anti-freezing device, a heat pump comprises the water pan arranged below an outdoor heat exchanger, an electric heater used for melting ice is arranged on the water pan, and an electromagnetic three-way valve used for assisting ice melting is arranged on a hot water outlet pipe of an indoor heat exchanger; a liquid inlet and a first liquid outlet of the electromagnetic three-way valve are connected into a hot water outlet pipe of the indoor heat exchanger in series, a first one-way valve is arranged on a water return pipe of the indoor heat exchanger, and a heat dissipation pipe used for assisting ice melting is further arranged on the water pan. A second liquid outlet of the electromagnetic three-way valve communicates with an inlet of the heat dissipation pipe through a first bypass branch, an outlet of the heat dissipation pipe is connected between the first one-way valve and a water return opening of the indoor heat exchanger through a second bypass branch, and a second one-way valve is connected to the second bypass branch in series. And a central controller of the heat pump is electrically connected with the electric heater and the electromagnetic three-way valve respectively. The device has the characteristic of stable operation.

Description

Technical Field

[0001] The invention relates to a heat pump antifreeze device with a water receiving pan and an operating method thereof. Background Art

[0002] Nowadays, air source heat pumps have been widely popularized due to their environmental protection, comfortable use, high energy utilization rate and simple installation conditions. At present, domestic heat pump products are pouring into the Northeast and Northwest markets. In the cold winter in the north, defrosting is an indispensable working mode during the operation of the heat pump. When the commercial unit is defrosted, the high-temperature defrosted water will flow along the fins to the water tray and finally be discharged to the outside. However, due to the low outdoor temperature, the defrosted water will quickly freeze in the water tray, blocking the drain outlet and finally affecting the defrosting effect. In addition, manual maintenance is difficult in winter and outdoor operations are difficult. Deicing can easily damage the evaporator and cause unnecessary problems.

[0003] In response to the above problems, some manufacturers have made improvements. For example, Chinese patent document No. CN 108224841A disclosed on June 29, 2018 a heat pump system with a water pan and ice melting pipeline, including a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator and a working fluid pipeline, wherein the outlet of the compressor is connected to the C port of the four-way valve, the D port of the four-way valve is connected to the inlet and outlet Q of the indoor heat exchanger, the E port of the four-way valve is connected to the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected to the inlet of the compressor, the F port of the four-way valve is connected to the inlet and outlet K of the outdoor heat exchanger, the inlet and outlet L of the outdoor heat exchanger is connected to the inlet of the one-way valve, and the outlet of the one-way valve is connected to the inlet of the one-way valve and the one-way valve. The inlet of valve 3 is connected, the branch where the check valve 3 is located is used as a cooling pipeline S and is finally connected to the inlet and outlet J of the indoor heat exchanger, the branch where the check valve 2 is located is used as a heating pipeline U and is finally connected to the connecting pipeline between the outdoor heat exchanger and the inlet of the check valve 1, the water receiving pan is arranged in the outdoor heat exchanger housing, the working fluid pipeline is arranged in the water receiving pan, one port of the working fluid pipeline is connected to the inlet and outlet J of the indoor heat exchanger, and the other port of the working fluid pipeline is connected to the outlet of the check valve 1, the working fluid pipeline is a one-way pipeline, a check valve 4 is connected to the working fluid pipeline, and the outlet end of the check valve is connected to the outlet of the check valve 1. The actual use effect of this heat pump system with a water receiving pan and ice melting pipeline is not ideal and needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a heat pump antifreeze device with a water receiving pan and an operating method thereof, so as to overcome the deficiencies in the prior art.

[0005] A heat pump antifreeze device with a water receiving pan designed for this purpose has the following structural characteristics: the heat pump includes a water receiving pan arranged under an outdoor heat exchanger, the water receiving pan is provided with an electric heater for melting ice, the hot water outlet pipe of the indoor heat exchanger is provided with an electromagnetic three-way valve for assisting ice melting, the liquid inlet and the first liquid outlet of the electromagnetic three-way valve are connected in series to the hot water outlet pipe of the indoor heat exchanger, the return pipe of the indoor heat exchanger is provided with a first one-way valve, the water receiving pan is also provided with a heat dissipation pipe for assisting ice melting, the second liquid outlet of the electromagnetic three-way valve is connected to the inlet of the heat dissipation pipe through a first bypass branch, the outlet of the heat dissipation pipe is connected between the first one-way valve and the return water port of the indoor heat exchanger through a second bypass branch, the second one-way valve is connected in series to the second bypass branch, and the central controller of the heat pump is electrically connected to the electric heater and the electromagnetic three-way valve respectively.

[0006] An operating method of a heat pump antifreeze device with a water receiving pan, characterized in that the operation comprises the following steps:

[0007] Step 1: The heat pump is powered on and starts running, and then proceeds to step 2;

[0008] Step 2, enter defrost mode, and then proceed to step 3;

[0009] Step 3: timely detect the current ambient temperature Ta and transmit it to the central controller of the heat pump, and then proceed to step 4;

[0010] Step 4: The central controller determines whether Ta≤0℃ is established. If yes, it goes to step 5; otherwise, it goes to step 3.

[0011] Step 5, the central controller determines whether there is a defrost command or a defrost signal issued, if yes, it goes to step 6, otherwise it goes to step 3;

[0012] Step 6: The central controller detects and determines whether the electric heating signal currently used for melting ice is on or off. If it is on, it goes to step 12, otherwise it goes to step 7;

[0013] Step 7: The central controller controls the counter to start counting, the current number n=1, and then proceeds to step 8;

[0014] Step 8, the central controller determines whether n≤3 is established. If yes, it proceeds to step 9, otherwise it proceeds to step 11;

[0015] Step nine, the central controller starts the auxiliary ice melting function: the central controller controls the electromagnetic three-way valve for auxiliary ice melting to open, the diameter of the second bypass branch is 0.1 to 0.5 of the diameter of the hot water outlet pipe of the indoor heat exchanger, and the process proceeds to step ten;

[0016] Step 10: After an auxiliary ice melting period T, where the value of T is in the range of 0.5 to 2 minutes, proceed to step 3;

[0017] Step 11: The heat pump is shut down and an alarm is issued;

[0018] Step 12: The central controller starts the electric heating and ice-melting function and goes to step 3.

[0019] After the present invention adopts the above-mentioned technical scheme, when the heat pump enters the defrost mode, when the current ambient temperature Ta≤0℃ and the defrost command is triggered or the defrost signal is sent, the central controller determines whether to execute the start-up electric heating ice-melting function or the start-up auxiliary ice-melting function according to the detected on-off result of the electric heating signal, and records the number of times the electric heating signal is disconnected, that is, the value of n. When n≤3 is not established, the heat pump triggers the protection to disconnect the main power supply and then shut down. The protection cannot be canceled without power off, thereby avoiding the misjudgment of the detection of the on-off result of the electric heating signal, and when the result of the electric heating signal being disconnected does occur, the auxiliary ice-melting function can be started by the central controller to defrost the heat pump. However, the execution time of starting the auxiliary ice-melting function is only within the operating time range where n≤3 is not established, so as to meet the user's experience.

[0020] In summary, the present invention has the characteristic of stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0022] Figure 2 It is a control flow chart of the present invention.

[0023] In the figure: 1 is an outdoor heat exchanger, 3 is an electromagnetic four-way valve, 7 is an indoor heat exchanger, 12 is a compressor, 14 is a first one-way valve, 15 is a second one-way valve, 16 is a water receiving pan, 17 is an electromagnetic three-way valve, 18 is a first bypass branch, and 19 is a second bypass branch. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-Figure 2, a heat pump antifreeze device with a water receiving pan, the heat pump comprises a water receiving pan 16 arranged under an outdoor heat exchanger 1, the water receiving pan 16 is provided with an electric heater for melting ice, the hot water outlet pipe of the indoor heat exchanger 7 is provided with an electromagnetic three-way valve 17 for assisting ice melting, the liquid inlet and the first liquid outlet of the electromagnetic three-way valve 17 are connected in series to the hot water outlet pipe of the indoor heat exchanger 7, the return pipe of the indoor heat exchanger 7 is provided with a first check valve 14, the water receiving pan 16 is also provided with a heat dissipation pipe for assisting ice melting, the second liquid outlet of the electromagnetic three-way valve 17 is connected to the inlet of the heat dissipation pipe through a first bypass branch 18, the outlet of the heat dissipation pipe is connected between the first check valve 14 and the return water port of the indoor heat exchanger (7) through a second bypass branch 19, the second bypass branch 19 is connected in series with a second check valve 15, and the central controller of the heat pump is electrically connected to the electric heater and the electromagnetic three-way valve 17 respectively.

[0026] In this embodiment, the method for operating the heat pump antifreeze device with a water receiving tray comprises the following steps:

[0027] Step 1: The heat pump is powered on and starts running, and then proceeds to step 2;

[0028] Step 2, enter defrost mode, and then proceed to step 3;

[0029] Step 3: timely detect the current ambient temperature Ta and transmit it to the central controller of the heat pump, and then proceed to step 4;

[0030] Step 4: The central controller determines whether Ta≤0℃ is established. If yes, it goes to step 5; otherwise, it goes to step 3.

[0031] Step 5, the central controller determines whether there is a defrost command or a defrost signal issued, if yes, it goes to step 6, otherwise it goes to step 3;

[0032] Step 6: The central controller detects and determines whether the electric heating signal currently used for melting ice is on or off. If it is on, it goes to step 12, otherwise it goes to step 7;

[0033] Step 7: The central controller controls the counter to start counting, the current number n=1, and then proceeds to step 8.

[0034] When the central controller detects the electric heating signal is disconnected for the first time, the current number n=1 is recorded and the subsequent steps are continued; when the central controller detects the electric heating signal is disconnected for the second time, the current number n=2 is recorded and the subsequent steps are continued; and so on.

[0035] When detecting the on / off signal of the electric heating signal, false detection may occur. However, the present invention provides a certain redundancy to ensure stable and reliable operation of the heat pump.

[0036] Step 8, the central controller determines whether n≤3 is established. If yes, it proceeds to step 9, otherwise it proceeds to step 11;

[0037] Step nine, the central controller starts the auxiliary ice melting function: the central controller controls the electromagnetic three-way valve 17 for auxiliary ice melting to open, the diameter of the second bypass branch 19 is 0.1 to 0.5 of the diameter of the hot water outlet pipe of the indoor heat exchanger 7, and then proceeds to step ten;

[0038] Step 10: After an auxiliary ice melting period T, where the value of T is in the range of 0.5 to 2 minutes, proceed to step 3;

[0039] Step 11: The heat pump is shut down and an alarm is issued;

[0040] Step 12: The central controller starts the electric heating and ice-melting function and goes to step 3.

[0041] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat pump antifreeze device with a water receiving tray, characterized in that The heat pump comprises a water receiving pan (16) arranged below the outdoor heat exchanger (1), the water receiving pan (16) being provided with an electric heater for melting ice, the hot water outlet pipe of the indoor heat exchanger (7) being provided with an electromagnetic three-way valve (17) for assisting in melting ice, the liquid inlet and the first liquid outlet of the electromagnetic three-way valve (17) being connected in series to the hot water outlet pipe of the indoor heat exchanger (7), the return pipe of the indoor heat exchanger (7) being provided with a first non-return valve (14), and the water receiving pan (16) being provided with an electric heater for melting ice. A heat dissipation pipe for assisting ice melting is also provided. The second liquid outlet of the electromagnetic three-way valve (17) is connected to the inlet of the heat dissipation pipe through a first bypass branch (18). The outlet of the heat dissipation pipe is connected between the first one-way valve (14) and the return water outlet of the indoor heat exchanger (7) through a second bypass branch (19). A second one-way valve (15) is connected in series to the second bypass branch (19). The central controller of the heat pump is electrically connected to the electric heater and the electromagnetic three-way valve (17) respectively.

2. An operating method of a heat pump antifreeze device with a water tray according to claim 1, characterized in that The operation includes the following steps: Step 1: The heat pump is powered on and starts running, and then proceeds to step 2; Step 2, enter defrost mode, and then proceed to step 3; Step 3: timely detect the current ambient temperature Ta and transmit it to the central controller of the heat pump, and then proceed to step 4; Step 4: The central controller determines whether Ta≤0℃ is established. If yes, it goes to step 5; otherwise, it goes to step 3. Step 5, the central controller determines whether there is a defrost command or a defrost signal issued, if yes, it goes to step 6, otherwise it goes to step 3; Step 6: The central controller detects and determines whether the electric heating signal currently used for melting ice is on or off. If it is on, it goes to step 12, otherwise it goes to step 7; Step 7: The central controller controls the counter to start counting, the current number n=1, and then proceeds to step 8; Step 8, the central controller determines whether n≤3 is established. If yes, it proceeds to step 9, otherwise it proceeds to step 11; Step nine, the central controller starts the auxiliary ice melting function: the central controller controls the electromagnetic three-way valve (17) for auxiliary ice melting to open, the diameter of the second bypass branch (19) is 0.1 to 0.5 of the diameter of the hot water outlet pipe of the indoor heat exchanger (7), and then proceeds to step ten; Step 10: After an auxiliary ice melting period T, where the value of T is in the range of 0.5 to 2 minutes, proceed to step 3; Step 11: The heat pump is shut down and an alarm is issued; Step 12: The central controller starts the electric heating and ice-melting function and goes to step 3.

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