Intelligent defrosting system of air source heat pump unit

Abstract

The utility model provides an air source heat pump unit intelligent defrosting system which comprises a defrosting controller, the defrosting controller comprises a first temperature sensor arranged on a condenser and a first indicator lamp connected with the first temperature sensor in series, and the first temperature sensor and the first indicator lamp are connected to a control chip after being connected in series. The control chip is arranged on the condenser, the detection water pipe is connected to the condenser, the valve is arranged on the detection water pipe, the water pump is arranged on the detection water pipe, the second temperature sensor is arranged on the detection water pipe and connected with the control chip, and the second indicator lamp is connected to the control chip. Whether the control chip is damaged or not can be conveniently obtained, whether the circuit where the first temperature sensor is located is disconnected or not can be rapidly and conveniently set and judged by observing the on-off state of the first indicator light when the second indicator light can be lightened, and the situation that the defrosting system cannot be started or is started at the wrong temperature due to the fact that the circuit where the first temperature sensor is located is disconnected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air source heat pumps, in particular to an intelligent defrosting system for an air source heat pump unit. Background Art

[0002] When the air source heat pump is operating in winter, when the air passes through the evaporator, water condenses on the surface of the evaporator and then forms ice or frost. The ice or frost on the evaporator will reduce the heat exchange area. Frosting of the heat pump will increase the pressure difference between the evaporator and the condenser, reducing the heating or cooling efficiency of the heat pump, thereby increasing energy consumption.

[0003] A heat pump with intelligent defrost provided by publication number CN201828085U includes a compressor, an oil separator, an oil return capillary, a four-way valve, a condenser, a throttling expansion valve, a liquid storage tank, a controller, an evaporator, a gas-liquid separator, and a temperature sensor. A temperature sensor controller is arranged on the evaporator. The temperature sensor controller is composed of a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. The first temperature sensor and the second temperature sensor are connected in series, the third temperature sensor and the fourth temperature sensor are connected in series, and the first temperature sensor and the second temperature sensor are connected in series and then connected in parallel with the part where the third temperature sensor and the fourth temperature sensor are connected in series.

[0004] However, when the above-mentioned heat pump with intelligent defrost is in use, because the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all connected in series, the starting temperature of the defrost system is related to the four sensors. When the circuit where a certain sensor is located is broken, it will affect the starting temperature, making the defrost system unable to start or start at the wrong temperature. Summary of the invention

[0005] The utility model aims to provide an intelligent defrosting system for an air source heat pump unit to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An intelligent defrosting system for an air source heat pump unit includes a compressor, an oil separator, an oil return capillary, a four-way valve, a condenser, a throttling expansion valve, a liquid storage tank, an evaporator, a gas-liquid separator, and a defrosting controller, wherein the defrosting controller includes:

[0008] A control component, the control component comprising a temperature sensor 1 for detecting the temperature of the condenser, and an indicator light 1 connected in series with the temperature sensor 1, wherein the temperature sensor 1 and the indicator light 1 are connected in series to a control chip;

[0009] The detection component includes a heating mechanism and a temperature sensor 2 connected to the control chip and used to detect the temperature change of the heating mechanism, and an indicator light 2 connected to the control chip. When the temperature sensor 2 detects that the temperature of the heating mechanism rises, the control chip controls the indicator light 2 to light up, and determines whether the circuit of the temperature sensor 1 is broken by turning the indicator light 1 off.

[0010] Preferably, the temperature increasing mechanism includes a detection water pipe connected to the condenser, a valve arranged on the detection water pipe, and a water pump arranged on the detection water pipe.

[0011] Preferably, when the valve is opened, the water pump can draw hot water from the condenser and supply it to the detection water pipe. When the temperature sensor 2 detects that the temperature of the detection water pipe has risen, the control chip lights up the indicator light 2. If the indicator light 1 is off, the circuit of the temperature sensor 1 is broken.

[0012] Preferably, the temperature sensor is a thermistor.

[0013] Preferably, a temperature insulating sleeve is provided on the detection water pipe.

[0014] Preferably, the second temperature sensor is arranged in the insulation sleeve used to isolate the external temperature.

[0015] Preferably, the outlet of the compressor is connected to the inlet of the oil separator, the outlet of the oil separator is connected to the four-way valve, the oil separator is connected to the inlet of the compressor through the oil return capillary, the four-way valve is also respectively connected to the inlet of the condenser, the outlet of the evaporator and the inlet of the gas-liquid separator, the outlet of the condenser is connected to the inlet of the liquid storage tank, the outlet of the liquid storage tank is connected to the throttling expansion valve, the other end of the throttling expansion valve is connected to the inlet of the evaporator, and the outlet of the gas-liquid separator is arranged on the inlet of the compressor.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model is provided with a defrost controller, which includes a control component, the control component including a temperature sensor 1 arranged on the condenser, an indicator light 1 connected in series with the temperature sensor 1, the temperature sensor 1 and the indicator light 1 are connected in series and then connected to a control chip, and a detection component, the detection component including a detection water pipe connected to the condenser, a valve arranged on the detection water pipe, a water pump arranged on the detection water pipe, a temperature sensor 2 arranged on the detection water pipe and connected to the control chip, and an indicator light 2 connected to the control chip. The utility model can conveniently determine whether the control chip is damaged through the setting of the indicator light 2, and when the indicator light 2 can be lit, by observing the on and off of the indicator light 1, it can be quickly and conveniently set to determine whether the circuit of the temperature sensor 1 is broken, so as to avoid the defrost system being unable to start or starting at a wrong temperature due to the broken circuit of the temperature sensor 1, causing frost on the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 This is the pipeline principle diagram of the utility model;

[0020] Figure 3 It is a circuit connection diagram of the control chip of the utility model.

[0021] In the figure: 1. Temperature sensor 1; 2. Indicator light 1; 3. Control chip; 4. Temperature sensor 2; 5. Indicator light 2; 6. Water pump; 7. Valve; 8. Detection water pipe; 110. Gas-liquid separator; 120. Compressor; 130. Return oil capillary; 140. Oil separator; 150. Four-way valve; 160. Condenser; 170. Liquid storage tank; 180. Throttling expansion valve; 190. Evaporator. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0023] See also Figures 1 to 3 , the utility model provides a technical solution:

[0024] An intelligent defrosting system for an air source heat pump unit, comprising:

[0025] Compressor 120, oil separator 140, oil return capillary 130, four-way valve 150, condenser 160, throttling expansion valve 180, liquid storage tank 170, evaporator 190, gas-liquid separator 110, defrost controller, the outlet of compressor 120 is connected to the inlet of oil separator 140, the outlet of oil separator 140 is connected to the four-way valve 150, the oil separator 140 is connected to the inlet of compressor 120 through the oil return capillary 130, the four-way valve 150 is also respectively connected to the inlet of condenser 160, the outlet of evaporator 190 and the inlet of gas-liquid separator 110, the outlet of condenser 160 is connected to the inlet of liquid storage tank 170, the outlet of liquid storage tank 170 is connected to the throttling expansion valve 180, the other end of the throttling expansion valve 180 is connected to the inlet of evaporator 190, and the outlet of gas-liquid separator 110 is arranged on the inlet of compressor 120.

[0026] The defrost controller includes a control component and a detection component.

[0027] The control component includes a temperature sensor 1, a control chip 3 and an indicator light 2; the temperature sensor 1 is arranged on the surface of the evaporator 190, and the temperature-sensitive resistor is fixedly connected to the surface of the evaporator 190 by gluing or welding. The temperature sensor 1 is a temperature-sensitive resistor, and a graphite PTC can be selected, which has the characteristics that the resistance value increases when the temperature rises and the resistance value decreases when the temperature drops. The indicator light 2 is connected in series with the temperature sensor 1, and the indicator light 2 is electrically connected to the temperature sensor 1 by setting wires. The control chip 3 is electrically connected to the temperature sensor 1 and the indicator light 2 respectively by setting wires. When the temperature on the surface of the evaporator 190 drops to the set frosting temperature, the control chip 3 controls the compressor 120 to stop, so that the frost on the surface of the evaporator 190 melts naturally, or controls the four-way valve 150 to reverse, so that the refrigerant is heated by the compressor 120 and then flows back to the evaporator 190, so that the high-temperature refrigerant removes the frost on the surface of the evaporator 190. The control chip 3 can select a simple-structured 80C51 single-chip microcomputer, and the frosting temperature can be set to 0 degrees Celsius and maintained for 2 minutes.

[0028] The detection component includes a heating mechanism, a temperature sensor 24 and an indicator light 25. The heating mechanism includes a detection water pipe 8, a valve 7 and a water pump 6. The detection water pipe 8 is arranged on the condenser 160. The water inlet and the water outlet of the detection water pipe 8 are inserted on the water tank of the condenser 160. The detection water pipe 8 is fixedly connected to the water tank of the condenser 160 by welding or the like. The valve 7 is arranged on the detection water pipe 8. The detection water pipe 8 is fixedly connected to the valve 7 by flange connection or the like. The water pump 6 is arranged on the detection water pipe 8. The detection water pipe 8 is fixedly connected to the water pump 6 by threaded connection or the like. The water pump 6 can be R5 of Roots Company. PB0004 / 0008C vacuum pump, temperature sensor 24 is arranged on the surface of detection water pipe 8, temperature sensor 24 is fixedly connected with the surface of detection water pipe 8 by gluing or other methods, temperature sensor 24 can use graphite PTC, which has the characteristics of increasing resistance when temperature rises and decreasing resistance when temperature drops, temperature sensor 24 is electrically connected with control chip 3 by setting wires, indicator light 25 is electrically connected with control chip 3 by setting wires, the outer surface of detection water pipe 8 is provided with a thermal insulation layer, the thermal insulation layer includes a sleeve and a device sleeved on the thermal insulation water pipe. The thermal insulation layer is placed in the casing, and the casing wraps the detection water pipe 8 and the temperature sensor 4 at the same time. The thermal insulation layer can be made of zirconia aerogel, which has excellent thermal isolation performance, low thermal conductivity, excellent mechanical strength and chemical stability. The thermal insulation layer is used to prevent the external temperature from affecting the temperature sensor 4. When the valve 7 is opened, the water pump 6 is used to pump the hot water in the condenser 160 into the detection water pipe 8. The temperature sensor 4 is used to sense whether the temperature of the detection water pipe 8 has risen by a rising temperature, and the rising temperature can be set to 30 degrees Celsius.

[0029] Working principle: When in use, when it is necessary to detect whether the circuit where the temperature sensor 1 is located is broken, when the valve 7 is opened, the water pump 6 can pump the hot water in the condenser 160 into the detection water pipe 8, and the temperature sensor 24 detects that the temperature of the detection water pipe 8 rises to the rising temperature. At this time, the control chip 3 lights up the indicator light 25. At this time, it can be judged that the control chip 3 is not damaged. If the indicator light 2 is in the off state, it can be judged whether the circuit where the temperature sensor 1 is located is broken.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent defrosting system for an air source heat pump unit, comprising a compressor, an oil separator, an oil return capillary, a four-way valve, a condenser, a throttling expansion valve, a liquid storage tank, an evaporator, a gas-liquid separator, and a defrosting controller. It is characterized in that The defrost controller comprises: A control component, the control component comprising a temperature sensor 1 for detecting the temperature of the condenser, and an indicator light 1 connected in series with the temperature sensor 1, wherein the temperature sensor 1 and the indicator light 1 are connected in series to a control chip; and The detection component includes a heating mechanism and a temperature sensor 2 connected to the control chip and used to detect the temperature change of the heating mechanism, and an indicator light 2 connected to the control chip. When the temperature sensor 2 detects that the temperature of the heating mechanism rises, the control chip controls the indicator light 2 to light up, and determines whether the circuit of the temperature sensor 1 is broken by turning the indicator light 1 off.

2. According to claim 1, an intelligent defrosting system for an air source heat pump unit, Features: The temperature raising mechanism comprises a detection water pipe connected to the condenser, a valve arranged on the detection water pipe, and a water pump arranged on the detection water pipe.

3. According to claim 2, an intelligent defrosting system for an air source heat pump unit, Features: When the valve is opened, the water pump can draw hot water from the condenser and supply it to the detection water pipe. When the temperature sensor 2 detects that the temperature of the detection water pipe rises, the control chip lights up the indicator light 2. If the indicator light 1 is off, the circuit of the temperature sensor 1 is broken.

4. According to claim 3, an intelligent defrosting system for an air source heat pump unit, Features: The temperature sensor 1 is a temperature sensitive resistor.

5. The intelligent defrosting system for an air source heat pump unit according to claim 4, Features: The detection water pipe is provided with a temperature insulation sleeve.

6. The intelligent defrosting system for air source heat pump unit according to claim 5, Features: The second temperature sensor is arranged in the insulation sleeve used to isolate the external temperature.

7. The intelligent defrosting system for air source heat pump unit according to claim 6, Features: The outlet of the compressor is connected to the inlet of the oil separator, and the outlet of the oil separator is connected to the four-way valve. The oil separator is connected to the inlet of the compressor through the oil return capillary. The four-way valve is also respectively connected to the inlet of the condenser, the outlet of the evaporator and the inlet of the gas-liquid separator. The outlet of the condenser is connected to the inlet of the liquid storage tank, and the outlet of the liquid storage tank is connected to the throttling expansion valve. The other end of the throttling expansion valve is connected to the inlet of the evaporator. The outlet of the gas-liquid separator is arranged on the inlet of the compressor.

Images