CN107917531B - Split type low-temperature heat pump water heater unit and control method thereof - Google Patents
Split type low-temperature heat pump water heater unit and control method thereof Download PDFInfo
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- CN107917531B CN107917531B CN201610885986.4A CN201610885986A CN107917531B CN 107917531 B CN107917531 B CN 107917531B CN 201610885986 A CN201610885986 A CN 201610885986A CN 107917531 B CN107917531 B CN 107917531B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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Abstract
A heat pump system of the water heater unit comprises a compressor, an economizer, an expansion valve, an evaporator, a four-way valve, a condenser, a circulating water path and a water tank, wherein an oil separator connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor and the four-way valve. The invention also provides a control method of the split type low-temperature heat pump water heater unit, which respectively controls the opening of the expansion valve of the main circulation loop and the opening and closing of the oil return electromagnetic valve of the oil separator according to the exhaust temperature of the compressor, so as to ensure the normal operation of the compressor. The method adopts the enhanced vapor injection compressor and the split heat pump system, effectively prevents the water circuit from freezing and damaging the unit in the low-temperature environment in winter, and simultaneously ensures the operation of the compressor to the greatest extent through two protective measures, thereby increasing the reliability of the unit.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a split type low-temperature heat pump water heater unit and a control method thereof.
Background
An air source heat pump water heater is a water heating device which absorbs and transfers low-temperature heat energy in air to a water tank by using a refrigerant to realize high energy efficiency, in the existing air source heat pump, a water path part of most units is integrated in the units and is placed outdoors, once the units are powered off or have faults, the water path is easy to freeze to break the pipeline, water enters the units, key parts such as a compressor and a valve need to be replaced completely, great property loss is caused, and the use of users in winter is greatly influenced due to the long period for replacing the parts.
In order to solve the problems, a split type unit is adopted, but the unit is easy to have the problem of insufficient return oil of lubricating oil due to the fact that the connecting pipe of the internal unit and the external unit is long, and once the compressor is lack of oil, the bearing is abraded and finally damaged. The common solution is to add an oil separator with a floating ball structure inside, and the oil separator starts to return oil when the oil level reaches a certain height. The scheme is mechanical and passive, cannot be adjusted according to the actual condition of the unit, and only can be stopped when problems occur, so that the service life of the unit is reduced for a long time.
The Chinese patent with the application number of 200820204879.1 discloses a circulation heating type air source heat pump water heater, which comprises a compressor, a liquid storage tank, an evaporator, a filter, an electronic expansion valve, a condenser, a fan motor, a circulating water pump, a throttling device, a circulating water path connecting pipe and an indoor heat storage water tank with a heat insulation layer; it is characterized in that: the compressor, the liquid storage tank, the evaporator, the filter, the electronic expansion valve, the fan motor and the throttling device form an outdoor unit; the indoor unit consists of an indoor heat storage water tank, a condenser and a circulating water pump, wherein the indoor heat storage water tank is provided with a circulating water inlet channel and a circulating water outlet channel, the circulating water pump is connected between the circulating water outlet channel and the water inlet end of the condenser, and the water outlet end of the condenser is communicated with the circulating water inlet channel. Due to the adoption of the structure, the condenser and the circulating water pump are arranged in the indoor unit; firstly, the weight of the outdoor unit is relatively reduced, and the outdoor unit is convenient to install; secondly, not only the defects that the condenser and the circulating water pump are damaged by freezing in the low-temperature condition in winter are eliminated, but also the maintenance and the replacement are convenient. However, the application does not disclose a technical scheme for solving the problem of insufficient oil return caused by long internal and external machine connecting pipes.
The chinese patent with application number 201410031735.0 discloses an air source heat pump water heater and a control method of an electronic expansion valve thereof, belongs to the field of air source heat pump water heater devices and control methods thereof, and is designed to solve the problems of poor heat exchange ratio and the like of the existing methods. The control method of the electronic expansion valve of the air source heat pump water heater comprises the steps of obtaining an exhaust dynamic temperature difference delta T1 according to factors influencing heat conduction in the air source heat pump water heater, adding the exhaust dynamic temperature difference delta T1 and a water temperature value in a water tank to obtain a target exhaust temperature Tm, comparing the target exhaust temperature Tm with an exhaust temperature Td of a compressor, and determining the opening degree and/or the valve adjusting speed of the electronic expansion valve according to the comparison result. However, the above invention does not provide an active oil return control system, and therefore, under the condition that the temperature is too high and the opening degree of the expansion valve is maximum, only the shutdown treatment can be performed, and the normal operation cannot be performed.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The application aims at providing a split type low-temperature heat pump water heater unit and a control method thereof, the unit arranges a condensation pipe and a water path indoors, is provided with an oil separator and an active oil return control system so as to achieve the purpose of using in a low-temperature environment, and meanwhile, the reliability of the unit operation is improved through the control method.
In order to achieve the purpose, the invention specifically adopts the following scheme:
a split type low-temperature heat pump water heater unit is characterized in that a heat pump system of the water heater unit comprises a compressor 1, an economizer 7, an expansion valve, an evaporator 4, a four-way valve 3 arranged outdoors, and a condenser 13, a circulating water path and a water tank arranged indoors, wherein the compressor 1 is connected with the condenser 13 through the four-way valve 3 to form an exhaust pipeline, the condenser 13 is connected with the evaporator 4 through a main path of the economizer 7 to form a circulating pipeline, the evaporator 4 is connected with the compressor 1 through the four-way valve 3 to form an air inlet pipeline, and the compressor 1 is connected with the condenser 13 and an auxiliary path of the economizer 7 through the four-way valve 3 in a circulating manner to form an enhanced vapor injection loop; an oil separator 2 connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor 1 and the four-way valve 3.
The invention adopts a split structure, the condenser 13 and the circulating water path in the unit are arranged indoors, and when the air conditioner is used in a cold environment, the unit can be prevented from being damaged by ice on the water path as long as the temperature of the environment where the indoor unit is located is higher than the freezing point.
The invention further comprises the following steps: an oil separator inlet 201 of the oil separator 2 is connected with a compressor exhaust port 101, an oil separator outlet 202 is connected with a first connector 301 of the four-way valve, a capillary tube 14 is arranged between a passive oil return port 203 of the oil separator and an air inlet pipeline of the compressor 1 to form a passive oil return pipeline, an active oil return port 204 of the oil separator is connected with the air inlet pipeline of the compressor 1 and is provided with a second electromagnetic valve 11 to form an active oil return pipeline.
Because a split structure is adopted, the pipeline of the whole machine is longer, the oil separator 2 is additionally arranged at the exhaust port 101 of the compressor to improve the oil return efficiency, the oil separator 2 is provided with a passive oil return pipeline and an active oil return pipeline, the passive oil return pipeline is connected with an air inlet loop of the compressor through a capillary tube 14, the capillary tube 14 stably and slowly supplies oil to the compressor through the siphon action, and when the oil return is insufficient, the second electromagnetic valve 11 is opened to open the active oil return pipeline of the oil separator 2, so that the oil return amount is increased to prevent the compressor 1 from being damaged.
The invention further comprises the following steps: a condenser inlet 1301 of the condenser 13 is connected with the fourth interface 304 of the four-way valve, and a condenser outlet 1302 is respectively connected with a main path and an auxiliary path of the economizer 7; the auxiliary path of the economizer 7 is connected with the compressor 103, and a first electromagnetic valve 8 and a second expansion valve 9 are sequentially arranged on a pipeline from the outlet 1302 of the condensation pipe to the auxiliary path of the economizer 7; the main path of the economizer 7 is connected with the inlet of the evaporator 4, the outlet of the evaporator 4 is connected with the second interface 302 of the four-way valve, and the pipeline from the main path of the economizer 7 to the inlet of the evaporator 4 is sequentially provided with a filter 5, a first expansion valve 6 and the filter 5.
The high-temperature and high-pressure gas working medium releases heat energy in the condenser 13, and simultaneously becomes a high-pressure liquid working medium, the pressure of the working medium is released through the first expansion valve 6 on the main path of the economizer 7 to become a superheated liquid working medium, and the superheated liquid working medium enters the evaporator 4.
The auxiliary path of the economizer 7 is an enhanced vapor injection loop in the invention, is connected with the air supplement port 103 of the compressor to improve the efficiency of the compressor, and can perform heating operation under the condition of the ambient temperature of-25 ℃.
The invention further comprises the following steps: the air inlet pipeline of the compressor 1 is formed by connecting an outlet of the evaporator 4, a second interface 302 of the four-way valve, a third interface 303 of the four-way valve, the gas-liquid separator 10 and an inlet 102 of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline with the air inlet pipeline are arranged between the gas-liquid separator 10 and the compressor inlet 102.
The invention further comprises the following steps: the compressor 1 is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port 1 of the compressor; the water tank is provided with a water temperature sensor.
The common air source unit is prevented frostbite in winter by starting the unit to heat hot water, and once the power is cut off or the unit fails, the common air source unit cannot be effectively prevented from being frostbitten. The common air source unit can only be used at the ambient temperature of more than minus 10 ℃, and the invention adopts the enhanced vapor injection technology and can be normally used at the ambient temperature of minus 25 ℃.
The invention also provides a control method of the split type low-temperature heat pump water heater unit, and the method adjusts the opening degree of the first expansion valve and/or the switch of the second electromagnetic valve according to the exhaust temperature of the compressor detected by the exhaust temperature sensor when the unit operates.
According to the control method described above, the exhaust temperature detection value is not higher than t2The compressor is operated at low load, and the exhaust temperature detection value is higher than t2And is not higher than t1The compressor is in load operation, and the exhaust temperature detection value is higher than t1And is lower than t3The compressor is operated at high load, and the exhaust temperature detection value is not lower than t3The compressor is overloaded. Preferably, t is2Is the set value of the exhaust temperature t of the compressor during normal operation of the compressor1Compressor discharge temperature set point, t, for insufficient oil supply to the compressor3The maximum discharge temperature set point for safe operation of the compressor.
The steps of the method are as follows:
(1) starting up the unit for operation;
(2) obtaining the exhaust temperature through a compressor exhaust temperature sensor, and when the temperature is not higher than t1If yes, executing the step (10); when the temperature is higher than t1If so, executing the step (3);
(3) detecting whether the opening degree of the first expansion valve reaches the maximum or not, and if so, executing the step (5); if not, executing the step (4);
(4) after the opening degree of the first expansion valve is increased by the amplification n, the exhaust temperature is obtained by a compressor exhaust temperature sensor, and when the temperature is not higher than t2If yes, executing the step (6); when the temperature is higher than t2If so, re-executing the step (3);
(5) after the second electromagnetic valve is opened, the exhaust temperature sensor of the compressor acquires the exhaust temperature, and when the temperature is not higher than t2If yes, executing the step (7); when the temperature is higher than t2If so, re-executing the step (8);
(6) executing the step (10) after reducing the opening degree of the first expansion valve;
(7) step (10) is executed after the second electromagnetic valve is closed;
(8) after the unit is maintained to operate for 3min, the exhaust temperature is acquired to be increased to t through the compressor exhaust temperature sensor3Executing the step (9);
(9) the unit sends out an alarm signal, and the unit is stopped;
(10) when the water temperature reaches a set value, the unit is stopped.
According to the steps of the control method, the operation mode of the unit comprises a first mode, a second mode, a third mode and a fourth mode.
The first mode is as follows: starting the split type low-temperature heat pump water heater unit, wherein the temperature obtained by the exhaust temperature sensor of the compressor is not higher than t1At the moment, the compressor runs under load, the unit runs normally, and the water temperature sensor stops when the water temperature reaches a preset value; and (3) executing the step (1), the step (2) and the step (10) by the unit.
The second mode is as follows: the split type low-temperature heat pump water heater unit is started, and the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, if the opening degree does not reach the maximum, the opening degree of the first expansion valve is increased according to the increasing amplitude n, and if the exhaust temperature of the compressor is reduced to be not more than t in the process of increasing the first expansion valve, the exhaust temperature of the compressor is reduced to be not more than t2When the compressor runs at low load, the unit returns to the normal state and the first step is reducedThe expansion valve is opened, and the machine is automatically stopped when the water temperature reaches a set value; at the moment, the unit executes the step (1), the step (2), the step (3), the step (4), the step (6) and the step (10).
The third mode is as follows: the split type low-temperature heat pump water heater unit is started, and the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, and if the first expansion valve reaches the maximum opening degree, the exhaust temperature of the compressor is still higher than t1When the compressor is still in high-load operation, the second electromagnetic valve is opened to actively return oil, and the exhaust temperature of the compressor is reduced to be not more than t2When the compressor runs at a low load, the unit returns to a normal state, the second electromagnetic valve is closed, and the unit is automatically stopped after the water temperature reaches a set value; at the moment, the unit executes the step (1), the step (2), the step (3), the step (5), the step (7) and the step (10).
The fourth mode is as follows: starting the split type low-temperature heat pump water heater unit and the active oil return control system, wherein the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, and if the first expansion valve reaches the maximum opening degree, the exhaust temperature of the compressor is still higher than t1And at the moment, the compressor is still in high-load operation, the second electromagnetic valve is opened for active oil return, and after the unit operates for 3min in the state, if the exhaust temperature of the compressor is continuously increased to t3When the compressor is overloaded and the unit is not normally operated, the unit is automatically stopped after an alarm signal is sent out; at the moment, the unit executes the step (1), the step (2), the step (3), the step (5), the step (8) and the step (9).
The control method according to the above, wherein in the second mode, the discharge temperature of the compressor is detected after increasing the opening degree of the first expansion valve, and when the discharge temperature is higher than t2At this time, the compressor is in a load operation, and the operation returns to the detection of whether the opening degree of the first expansion valve reaches the maximum or not and the second mode or the third mode is executed according to the situation.
According to the control method described above, the amplification n in the second mode is 15 steps/time.
The control method of the heat pump water heater unit provided by the invention increases the control of electronic expansion valve control and active oil return, judges the oil return condition of the unit by combining the exhaust temperature of the compressor, and can effectively reduce the risk of damaging the compressor caused by untimely oil return.
The invention has the beneficial effects that:
1. the heat pump water heater unit adopts a split structure, the circulating water path and the condenser pipe are arranged indoors, and the risk of damaging the unit due to freezing of the water path is permanently avoided by adjusting the indoor temperature to be higher than 0 ℃;
2. the compressor of the invention adopts an enhanced vapor injection technology and can be normally used in a low-temperature environment with the temperature of-25 ℃;
3. the heat pump water heater is provided with the oil separator device, and because an indoor and outdoor split structure is adopted, the connecting pipe is long, so that the oil return of lubricating oil is difficult, the oil separator can directly return the lubricating oil to the inlet of the compressor, and the damage of the compressor caused by oil shortage is avoided;
4. the control method of the heat pump water heater unit provided by the invention has two protective measures, one is to increase the opening degree of the main circulation expansion valve so as to increase the flow of the refrigerant and reduce the exhaust temperature, and the other measure is to actively supply oil through the oil separator so as to ensure that the oil smoothly returns to the compressor; the two protective measures cooperate to greatly improve the reliability of the unit operation.
Drawings
Fig. 1 is a schematic structural diagram of the split type low-temperature heat pump water heater unit.
Fig. 2 is a flow chart of the control method of the split type low-temperature heat pump water heater unit.
The main components in the figure are as follows: 1-compressor, 101-compressor exhaust, 102-compressor inlet, 103-compressor air supplement port, 2-oil separator, 201-oil separator inlet, 202-oil separator outlet, 203-oil separator passive oil return port, 204-oil separator active oil return port, 3-four-way valve, 301-four-way valve first interface, 302-four-way valve second interface, 303-four-way valve third interface, 304-four-way valve fourth interface, 4-evaporator, 5-filter, 6-first expansion valve, 7-economizer, 8-first solenoid valve, 9-second expansion valve, 10-gas-liquid separator, 11-second solenoid valve, 12-connecting pipe, 13-condenser pipe, 1301-condenser pipe inlet, 1302-condenser pipe outlet, 14-capillary pipe.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic views, and merely illustrate the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the invention.
Example 1
As shown in fig. 1, a split type low-temperature heat pump water heater unit, a heat pump system of the water heater unit comprises a compressor 1, an economizer 7, an expansion valve, an evaporator 4, a four-way valve 3 arranged outdoors, and a condenser 13, a circulating water path and a water tank arranged indoors, and is characterized in that the compressor 1 is connected with the condenser 13 through the four-way valve 3 to form an exhaust pipeline, the condenser 13 is connected with the evaporator 4 through a main path of the economizer 7 to form a circulating pipeline, the evaporator 4 is connected with the compressor 1 through the four-way valve 3 to form an air inlet pipeline, and the compressor 1 is connected with the condenser 13 and an auxiliary path of the economizer 7 through the four-way valve 3 to form an enhanced vapor injection loop; an oil separator 2 connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor 1 and the four-way valve 3.
In this embodiment, the unit has adopted split type structure, arranges the condenser 13 in the unit in with circulation water route indoor, when using in cold environment, as long as guarantee that the temperature of indoor set place environment is higher than the freezing point, can prevent that the water route from connecing the ice and damaging the unit. The connecting pipes 12 for connecting the indoor unit and the outdoor unit and the pipes of the outdoor unit are all refrigerants, so that the freezing caused by the low external environment temperature can be avoided.
In this embodiment, the inlet 201 of the oil separator is connected to the exhaust port 101 of the compressor, the outlet 202 of the oil separator is connected to the first port 301 of the four-way valve, the capillary 14 is disposed between the passive oil return port 203 of the oil separator and the air intake circuit of the compressor 1 to form a passive oil return pipeline, and the active oil return port 204 of the oil separator is connected to the air intake circuit of the compressor 1 and is provided with the second solenoid valve 11 to form an active oil return pipeline.
In the embodiment, the unit adopts a split structure, and the connection pipeline of the whole unit is longer, so that the oil separator 2 is additionally arranged at the exhaust port 101 of the compressor to improve the oil return efficiency, and the oil separator 2 is provided with a passive oil return pipeline and an active oil return pipeline, wherein the passive oil return pipeline is connected with an air inlet loop of the compressor through a capillary tube 14, the capillary tube 14 stably and slowly supplies oil to the compressor through the siphon action, and when the oil return is insufficient by the capillary tube 14 alone, the active oil return pipeline of the oil separator 2 is opened by opening the second electromagnetic valve 11, so that the oil return amount is increased to prevent the damage of the compressor.
In this embodiment, the inlet 1301 of the condenser pipe is connected to the fourth interface 304 of the four-way valve, and the outlet 1302 of the condenser pipe is connected to the main path and the auxiliary path of the economizer 7, respectively; the auxiliary path of the economizer 7 is connected with the air supplement port 103 of the compressor, and a first electromagnetic valve 8 and a second expansion valve 9 are sequentially arranged on a pipeline from the outlet 1302 of the condenser pipe to the auxiliary path of the economizer 7; the main path of the economizer 7 is connected with the inlet of the evaporator 4, the outlet of the evaporator 4 is connected with the second interface 302 of the four-way valve, and the pipeline from the main path of the economizer 7 to the inlet of the evaporator 4 is sequentially provided with a filter 5, a first expansion valve 6 and the filter 5.
In this embodiment, the high-temperature and high-pressure gas working medium releases heat energy in the condenser 13, and at the same time, the gas working medium itself becomes a high-pressure liquid working medium, and the pressure of the working medium is released by the first expansion valve 6 on the main path of the economizer 7 to become a superheated liquid working medium, and enters the evaporator 4.
In this embodiment, the economizer 7 is a gas injection enthalpy increasing loop in the present invention, and is connected to the compressor air supply port 103 to improve the efficiency of the compressor, and can perform heating operation at an ambient temperature of-25 ℃.
In this embodiment, the air inlet pipe of the compressor 1 is formed by connecting the outlet of the evaporator 4, the second interface 302 of the four-way valve, the third interface 303 of the four-way valve, the gas-liquid separator 10 and the inlet 102 of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline with the air inlet pipeline are arranged between the gas-liquid separator 10 and the compressor inlet 102.
In the embodiment, the compressor 1 is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port 1 of the compressor; the water tank is provided with a water temperature sensor.
In the embodiment, the enhanced vapor injection technology is adopted, and the device can be normally used at the ambient temperature of minus 25 ℃. And the common air source unit is prevented frostbite in winter by adopting a mode of starting the unit to heat hot water, and once the power is off or the unit fails, the common air source unit cannot effectively prevent frostbite.
The heating working principle of the embodiment is as follows: the hot liquid working medium absorbs the heat of a low-temperature object in the evaporator 4, is evaporated into a gas working medium, the second interface 302 of the four-way valve is communicated with the third interface 303 of the four-way valve, the gas working medium enters the inlet 102 of the compressor through the gas-liquid separator 10, the gas working medium is compressed by the compressor 1, is changed into a high-temperature high-pressure gas working medium, is released from the exhaust port 101 of the compressor, enters the first interface 301 of the four-way valve through the oil separator 2, the first interface 301 of the four-way valve is communicated with the fourth interface 304 of the four-way valve, the high-temperature high-pressure gas working medium enters the inlet 1301 of the condenser through the four-way valve 3, releases the heat energy in the condenser 13, simultaneously is changed into a high-pressure liquid working medium, is released from the outlet 1301 of the condenser, and is changed into, and enters the evaporator 4 to circulate the initial process; the auxiliary path of the economizer 7 is an enhanced vapor injection loop in the invention, and is connected with the air supplement port 103 of the compressor, so that the efficiency of the compressor is improved, and the heating operation of the unit is ensured under the condition of the ambient temperature of-25 ℃.
Example 2
As shown in fig. 1, a split type low-temperature heat pump water heater unit, a heat pump system of the water heater unit comprises a compressor 1, an economizer 7, an expansion valve, an evaporator 4, a four-way valve 3 arranged outdoors, and a condenser 13, a circulating water path and a water tank arranged indoors, and is characterized in that the compressor 1 is connected with the condenser 13 through the four-way valve 3 to form an exhaust pipeline, the condenser 13 is connected with the evaporator 4 through a main path of the economizer 7 to form a circulating pipeline, the evaporator 4 is connected with the compressor 1 through the four-way valve 3 to form an air inlet pipeline, and the compressor 1 is connected with the condenser 13 and an auxiliary path of the economizer 7 through the four-way valve 3 to form an enhanced vapor injection loop; an oil separator 2 connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor 1 and the four-way valve 3.
In this embodiment, the inlet 201 of the oil separator is connected to the exhaust port 101 of the compressor, the outlet 202 of the oil separator is connected to the first port 301 of the four-way valve, the capillary 14 is disposed between the passive oil return port 203 of the oil separator and the air intake circuit of the compressor 1 to form a passive oil return pipeline, and the active oil return port 204 of the oil separator is connected to the air intake circuit of the compressor 1 and is provided with the second solenoid valve 11 to form an active oil return pipeline.
In this embodiment, the inlet 1301 of the condenser pipe is connected to the fourth interface 304 of the four-way valve, and the outlet 1302 of the condenser pipe is connected to the main path and the auxiliary path of the economizer 7, respectively; the auxiliary path of the economizer 7 is connected with the air supplement port 103 of the compressor, and a first electromagnetic valve 8 and a second expansion valve 9 are sequentially arranged on a pipeline from the outlet 1302 of the condenser pipe to the auxiliary path of the economizer 7; the main path of the economizer 7 is connected with the inlet of the evaporator 4, the outlet of the evaporator 4 is connected with the second interface 302 of the four-way valve, and the pipeline from the main path of the economizer 7 to the inlet of the evaporator 4 is sequentially provided with a filter 5, a first expansion valve 6 and the filter 5.
In this embodiment, the air inlet pipe of the compressor 1 is formed by connecting the outlet of the evaporator 4, the second interface 302 of the four-way valve, the third interface 303 of the four-way valve, the gas-liquid separator 10 and the inlet 102 of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline with the air inlet pipeline are arranged between the gas-liquid separator 10 and the compressor inlet 102.
In the embodiment, the compressor 1 is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port 1 of the compressor; the water tank is provided with a water temperature sensor.
As shown in fig. 2, the present invention further provides a control method of the split type low-temperature heat pump water heater unit, wherein the method adjusts the opening degree of the first expansion valve and/or the switch of the second solenoid valve according to the exhaust temperature of the compressor detected by the exhaust temperature sensor when the unit is in operation.
In this embodiment, the compressor is determined to beExhaust gas temperature t at constant operation2Exhaust temperature t when oil supply of compressor is insufficient1And maximum temperature t of safe discharge of compressor3(ii) a When the exhaust temperature is not higher than t2When the compressor is running at low load, when the exhaust temperature is higher than t2And is not higher than t1The compressor is operated at a load, and when the discharge temperature is higher than t1And is lower than t3When the compressor is in high-load operation, when the exhaust temperature is not lower than t3The compressor is overloaded.
In this embodiment, according to the method, the operation mode of the unit is a first mode: starting the split type low-temperature heat pump water heater unit, wherein the temperature obtained by the exhaust temperature sensor of the compressor is not higher than t1And at the moment, the compressor runs under a load, the unit runs normally, and the water temperature acquired by the water temperature sensor is stopped after reaching a preset value.
In this embodiment, the unit executes step (1), step (2), and step (10) of the control method in the summary of the invention.
Example 3
As shown in fig. 1, a split type low-temperature heat pump water heater unit, a heat pump system of the water heater unit comprises a compressor 1, an economizer 7, an expansion valve, an evaporator 4, a four-way valve 3 arranged outdoors, and a condenser 13, a circulating water path and a water tank arranged indoors, and is characterized in that the compressor 1 is connected with the condenser 13 through the four-way valve 3 to form an exhaust pipeline, the condenser 13 is connected with the evaporator 4 through a main path of the economizer 7 to form a circulating pipeline, the evaporator 4 is connected with the compressor 1 through the four-way valve 3 to form an air inlet pipeline, and the compressor 1 is connected with the condenser 13 and an auxiliary path of the economizer 7 through the four-way valve 3 to form an enhanced vapor injection loop; an oil separator 2 connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor 1 and the four-way valve 3.
In this embodiment, the inlet 201 of the oil separator is connected to the exhaust port 101 of the compressor, the outlet 202 of the oil separator is connected to the first port 301 of the four-way valve, the capillary 14 is disposed between the passive oil return port 203 of the oil separator and the air intake circuit of the compressor 1 to form a passive oil return pipeline, and the active oil return port 204 of the oil separator is connected to the air intake circuit of the compressor 1 and is provided with the second solenoid valve 11 to form an active oil return pipeline.
In this embodiment, the inlet 1301 of the condenser pipe is connected to the fourth interface 304 of the four-way valve, and the outlet 1302 of the condenser pipe is connected to the main path and the auxiliary path of the economizer 7, respectively; the auxiliary path of the economizer 7 is connected with the air supplement port 103 of the compressor, and a first electromagnetic valve 8 and a second expansion valve 9 are sequentially arranged on a pipeline from the outlet 1302 of the condenser pipe to the auxiliary path of the economizer 7; the main path of the economizer 7 is connected with the inlet of the evaporator 4, the outlet of the evaporator 4 is connected with the second interface 302 of the four-way valve, and the pipeline from the main path of the economizer 7 to the inlet of the evaporator 4 is sequentially provided with a filter 5, a first expansion valve 6 and the filter 5.
In this embodiment, the air inlet pipe of the compressor 1 is formed by connecting the outlet of the evaporator 4, the second interface 302 of the four-way valve, the third interface 303 of the four-way valve, the gas-liquid separator 10 and the inlet 102 of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline with the air inlet pipeline are arranged between the gas-liquid separator 10 and the compressor inlet 102.
In the embodiment, the compressor 1 is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port 1 of the compressor; the water tank is provided with a water temperature sensor.
As shown in fig. 2, the present invention further provides a control method of the split type low-temperature heat pump water heater unit, wherein the method adjusts the opening degree of the first expansion valve and/or the switch of the second solenoid valve according to the exhaust temperature of the compressor detected by the exhaust temperature sensor when the unit is in operation.
In this embodiment, the discharge temperature t at which the compressor normally operates is determined2Exhaust temperature t when oil supply of compressor is insufficient1And maximum temperature t of safe discharge of compressor3(ii) a When the exhaust temperature is not higher than t2When the compressor is running at low load, when the exhaust temperature is higher than t2And is not higher than t1The compressor is operated at a load, and when the discharge temperature is higher than t1And is lower than t3When the compressor is in high-load operation, when the exhaust temperature is not lower than t3The compressor is overloaded.
In this embodiment, according to the method, the operation mode of the unitIn the second mode: the split type low-temperature heat pump water heater unit is started, and the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, if the opening degree does not reach the maximum, the opening degree of the first expansion valve is increased according to the increasing amplitude n, and if the exhaust temperature of the compressor is reduced to be not more than t in the process of increasing the first expansion valve, the exhaust temperature of the compressor is reduced to be not more than t2And at the moment, the compressor runs at a low load, the unit returns to a normal state, the opening degree of the first expansion valve is reduced, and the unit is automatically stopped after the water temperature reaches a set value.
In this embodiment, the unit executes step (1), step (2), step (3), step (4), step (6) and step (10) of the control method in the summary of the invention.
In this embodiment, in the second mode, the discharge temperature of the compressor is detected after the opening degree of the first expansion valve is increased, and if the discharge temperature is higher than t2At this time, the compressor is in a load operation, and the operation returns to the detection of whether the opening degree of the first expansion valve reaches the maximum or not and the second mode or the third mode is executed according to the situation.
In the present embodiment, the amplification n of the first expansion valve in the second mode is 15 steps/time.
Example 4
As shown in fig. 1, a split type low-temperature heat pump water heater unit, a heat pump system of the water heater unit comprises a compressor 1, an economizer 7, an expansion valve, an evaporator 4, a four-way valve 3 arranged outdoors, and a condenser 13, a circulating water path and a water tank arranged indoors, and is characterized in that the compressor 1 is connected with the condenser 13 through the four-way valve 3 to form an exhaust pipeline, the condenser 13 is connected with the evaporator 4 through a main path of the economizer 7 to form a circulating pipeline, the evaporator 4 is connected with the compressor 1 through the four-way valve 3 to form an air inlet pipeline, and the compressor 1 is connected with the condenser 13 and an auxiliary path of the economizer 7 through the four-way valve 3 to form an enhanced vapor injection loop; an oil separator 2 connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor 1 and the four-way valve 3.
In this embodiment, the inlet 201 of the oil separator is connected to the exhaust port 101 of the compressor, the outlet 202 of the oil separator is connected to the first port 301 of the four-way valve, the capillary 14 is disposed between the passive oil return port 203 of the oil separator and the air intake circuit of the compressor 1 to form a passive oil return pipeline, and the active oil return port 204 of the oil separator is connected to the air intake circuit of the compressor 1 and is provided with the second solenoid valve 11 to form an active oil return pipeline.
In this embodiment, the inlet 1301 of the condenser pipe is connected to the fourth interface 304 of the four-way valve, and the outlet 1302 of the condenser pipe is connected to the main path and the auxiliary path of the economizer 7, respectively; the auxiliary path of the economizer 7 is connected with the air supplement port 103 of the compressor, and a first electromagnetic valve 8 and a second expansion valve 9 are sequentially arranged on a pipeline from the outlet 1302 of the condenser pipe to the auxiliary path of the economizer 7; the main path of the economizer 7 is connected with the inlet of the evaporator 4, the outlet of the evaporator 4 is connected with the second interface 302 of the four-way valve, and the pipeline from the main path of the economizer 7 to the inlet of the evaporator 4 is sequentially provided with a filter 5, a first expansion valve 6 and the filter 5.
In this embodiment, the air inlet pipe of the compressor 1 is formed by connecting the outlet of the evaporator 4, the second interface 302 of the four-way valve, the third interface 303 of the four-way valve, the gas-liquid separator 10 and the inlet 102 of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline with the air inlet pipeline are arranged between the gas-liquid separator 10 and the compressor inlet 102.
In the embodiment, the compressor 1 is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port 1 of the compressor; the water tank is provided with a water temperature sensor.
As shown in fig. 2, the present invention further provides a control method of the split type low-temperature heat pump water heater unit, wherein the method adjusts the opening degree of the first expansion valve and/or the switch of the second solenoid valve according to the exhaust temperature of the compressor detected by the exhaust temperature sensor when the unit is in operation.
In this embodiment, the discharge temperature t at which the compressor normally operates is determined2Exhaust temperature t when oil supply of compressor is insufficient1And maximum temperature t of safe discharge of compressor3(ii) a When the exhaust temperature is not higher than t2When the compressor is running at low load, when the exhaust temperature is higher than t2And is not higher than t1The compressor is operated at a load, and when the discharge temperature is higher than t1And is lower than t3High load operation of the compressorWhen the exhaust temperature is not lower than t3The compressor is overloaded.
In this embodiment, according to the method, the operation mode of the unit is a third mode: the split type low-temperature heat pump water heater unit is started, and the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, and if the first expansion valve reaches the maximum opening degree, the exhaust temperature of the compressor is still higher than t1When the compressor is still in high-load operation, the second electromagnetic valve is opened to actively return oil, and the exhaust temperature of the compressor is reduced to be not more than t2And at the moment, the compressor runs at a low load, the unit returns to a normal state, the second electromagnetic valve is closed, and the machine is automatically stopped after the water temperature reaches a set value.
In this embodiment, the unit executes step (1), step (2), step (3), step (5), step (7) and step (10) of the control method in the summary of the invention.
Example 5
As shown in fig. 1, a split type low-temperature heat pump water heater unit, a heat pump system of the water heater unit comprises a compressor 1, an economizer 7, an expansion valve, an evaporator 4, a four-way valve 3 arranged outdoors, and a condenser 13, a circulating water path and a water tank arranged indoors, and is characterized in that the compressor 1 is connected with the condenser 13 through the four-way valve 3 to form an exhaust pipeline, the condenser 13 is connected with the evaporator 4 through a main path of the economizer 7 to form a circulating pipeline, the evaporator 4 is connected with the compressor 1 through the four-way valve 3 to form an air inlet pipeline, and the compressor 1 is connected with the condenser 13 and an auxiliary path of the economizer 7 through the four-way valve 3 to form an enhanced vapor injection loop; an oil separator 2 connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor 1 and the four-way valve 3.
In this embodiment, the inlet 201 of the oil separator is connected to the exhaust port 101 of the compressor, the outlet 202 of the oil separator is connected to the first port 301 of the four-way valve, the capillary 14 is disposed between the passive oil return port 203 of the oil separator and the air intake circuit of the compressor 1 to form a passive oil return pipeline, and the active oil return port 204 of the oil separator is connected to the air intake circuit of the compressor 1 and is provided with the second solenoid valve 11 to form an active oil return pipeline.
In this embodiment, the inlet 1301 of the condenser pipe is connected to the fourth interface 304 of the four-way valve, and the outlet 1302 of the condenser pipe is connected to the main path and the auxiliary path of the economizer 7, respectively; the auxiliary path of the economizer 7 is connected with the air supplement port 103 of the compressor, and a first electromagnetic valve 8 and a second expansion valve 9 are sequentially arranged on a pipeline from the outlet 1302 of the condenser pipe to the auxiliary path of the economizer 7; the main path of the economizer 7 is connected with the inlet of the evaporator 4, the outlet of the evaporator 4 is connected with the second interface 302 of the four-way valve, and the pipeline from the main path of the economizer 7 to the inlet of the evaporator 4 is sequentially provided with a filter 5, a first expansion valve 6 and the filter 5.
In this embodiment, the air inlet pipe of the compressor 1 is formed by connecting the outlet of the evaporator 4, the second interface 302 of the four-way valve, the third interface 303 of the four-way valve, the gas-liquid separator 10 and the inlet 102 of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline with the air inlet pipeline are arranged between the gas-liquid separator 10 and the compressor inlet 102.
In the embodiment, the compressor 1 is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port 1 of the compressor; the water tank is provided with a water temperature sensor.
As shown in fig. 2, the present invention further provides a control method of the split type low-temperature heat pump water heater unit, wherein the method adjusts the opening degree of the first expansion valve and/or the switch of the second solenoid valve according to the exhaust temperature of the compressor detected by the exhaust temperature sensor when the unit is in operation.
In this embodiment, the discharge temperature t at which the compressor normally operates is determined2Exhaust temperature t when oil supply of compressor is insufficient1And maximum temperature t of safe discharge of compressor3(ii) a When the exhaust temperature is not higher than t2When the compressor is running at low load, when the exhaust temperature is higher than t2And is not higher than t1The compressor is operated at a load, and when the discharge temperature is higher than t1And is lower than t3When the compressor is in high-load operation, when the exhaust temperature is not lower than t3The compressor is overloaded.
In this embodiment, according to the method, the operation mode of the unit is a fourth mode: open split type low temperature heat pump water heaterThe temperature obtained by a compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, and if the first expansion valve reaches the maximum opening degree, the exhaust temperature of the compressor is still higher than t1And at the moment, the compressor is still in high-load operation, the second electromagnetic valve is opened for active oil return, and after the unit operates for 3min in the state, if the exhaust temperature of the compressor is continuously increased to t3And at the moment, the compressor is overloaded, the unit is abnormal in operation, and the machine is automatically stopped after an alarm signal is sent out.
In this embodiment, the unit executes step (1), step (2), step (3), step (5), step (8) and step (9) of the control method in the summary of the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. The control method of the split type low-temperature heat pump water heater unit is characterized in that a heat pump system of the water heater unit comprises a compressor, an economizer, an expansion valve, an evaporator, a four-way valve, a condenser, a circulating water path and a water tank, wherein the compressor is connected with the condenser through the four-way valve to form an exhaust pipeline, the condenser is connected with the evaporator through a main pipeline of the economizer to form a circulating pipeline, the evaporator is connected with the compressor through the four-way valve to form an air inlet pipeline, and the compressor is connected with the condenser and an auxiliary pipeline of the economizer through the four-way valve in a circulating mode to form an enhanced vapor injection; an oil separator connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor and the four-way valve; an oil separator inlet of the oil separator is connected with an exhaust port of the compressor, an oil separator outlet is connected with a first connector of the four-way valve, a capillary tube is arranged between a passive oil return port of the oil separator and an air inlet pipeline of the compressor to form a passive oil return pipeline, and a driving oil return port of the oil separator is connected with an air inlet pipeline of the compressor and is provided with a second electromagnetic valve to form a driving oil return pipeline; an inlet of a condensing pipe of the condensing pipe is connected with a fourth interface of the four-way valve, and an outlet of the condensing pipe is respectively connected with a main path and an auxiliary path of the economizer; the auxiliary path of the economizer is connected with an air supplement port of the compressor, and a first electromagnetic valve and a second expansion valve are sequentially arranged on a pipeline from the outlet of the condenser pipe to the auxiliary path of the economizer; the compressor is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port of the compressor; according to the method, the opening degree of a first expansion valve and/or the switch of a second electromagnetic valve are/is adjusted according to the exhaust temperature of a compressor detected by an exhaust temperature sensor when a unit operates;
the control method specifically comprises the following steps:
(1) starting up the unit for operation;
(2) obtaining the exhaust temperature through a compressor exhaust temperature sensor, and when the temperature is not higher than t1If yes, executing the step (10); when the temperature is higher than t1If so, executing the step (3);
(3) detecting whether the opening degree of the first expansion valve reaches the maximum or not, and if so, executing the step (5); if not, executing the step (4);
(4) after the opening degree of the first expansion valve is increased by the amplification n, the exhaust temperature is obtained by a compressor exhaust temperature sensor, and when the temperature is not higher than t2If yes, executing the step (6); when the temperature is higher than t2If so, re-executing the step (3);
(5) after the second electromagnetic valve is opened, the exhaust temperature sensor of the compressor acquires the exhaust temperature, and when the temperature is not higher than t2If yes, executing the step (7); when the temperature is higher than t2If so, re-executing the step (8);
(6) executing the step (10) after reducing the opening degree of the first expansion valve;
(7) step (10) is executed after the second electromagnetic valve is closed;
(8) after the unit is maintained to operate for 3min, the exhaust temperature is acquired to be increased to t through the compressor exhaust temperature sensor3Executing the step (9);
(9) the unit sends out an alarm signal, and the unit is stopped;
(10) when the water temperature reaches a set value, the unit is shut down;
the operation modes of the unit comprise a first mode, a second mode, a third mode and a fourth mode;
the first mode is as follows: starting the split type low-temperature heat pump water heater unit, wherein the temperature obtained by the exhaust temperature sensor of the compressor is not higher than t1At the moment, the compressor runs under load, the unit runs normally, and the water temperature sensor stops when the water temperature reaches a preset value;
the second mode is as follows: the split type low-temperature heat pump water heater unit is started, and the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, if the opening degree does not reach the maximum, the opening degree of the first expansion valve is increased according to the increasing amplitude n, and if the exhaust temperature of the compressor is reduced to be not more than t in the process of increasing the first expansion valve, the exhaust temperature of the compressor is reduced to be not more than t2When the compressor runs at a low load, the unit returns to a normal state, the opening degree of the first expansion valve is reduced, and the unit is automatically stopped when the water temperature reaches a set value;
the third mode is as follows: the split type low-temperature heat pump water heater unit is started, and the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, and if the first expansion valve reaches the maximum opening degree, the exhaust temperature of the compressor is still higher than t1When the compressor is still in high-load operation, the second electromagnetic valve is opened to actively return oil, and the exhaust temperature of the compressor is reduced to be not more than t2When the compressor runs at a low load, the unit returns to a normal state, the second electromagnetic valve is closed, and the unit is automatically stopped after the water temperature reaches a set value;
the fourth mode is as follows: starting the split type low-temperature heat pump water heater unit and the active oil return control system, wherein the temperature acquired by the compressor exhaust temperature sensor is higher than t1When the compressor is in high-load operation, the opening degree of the first expansion valve is detected, and if the first expansion valve reaches the maximum opening degree, the exhaust temperature of the compressor is still higher than t1And at the moment, the compressor is still in high-load operation, the second electromagnetic valve is opened for active oil return, and after the unit operates for 3min in the state, if the exhaust temperature of the compressor is continuously increased to t3When the compressor is overloaded, the machineThe group is abnormally operated and automatically stops after an alarm signal is sent out.
2. The method for controlling a split type low-temperature heat pump water heater unit according to claim 1, wherein the exhaust temperature detection value is not higher than t2The compressor is operated at low load, and the exhaust temperature detection value is higher than t2And is not higher than t1The compressor is in load operation, and the exhaust temperature detection value is higher than t1And is lower than t3The compressor is operated at high load, and the exhaust temperature detection value is not lower than t3The compressor is overloaded.
3. The method for controlling a split type low-temperature heat pump water heater unit according to claim 2, wherein t is1、t2And t3Are all set values.
4. The method as claimed in claim 1, wherein in the second mode, the discharge temperature of the compressor is detected after the opening degree of the first expansion valve is increased, and if the discharge temperature is higher than t2At this time, the compressor is in a load operation, and the operation returns to the detection of whether the opening degree of the first expansion valve reaches the maximum or not and the second mode or the third mode is executed according to the situation.
5. The method for controlling a split type low-temperature heat pump water heater unit according to claim 1, wherein the amplification n of the first solenoid valve in the second mode is 15 steps/time.
6. A split type low-temperature heat pump water heater unit applying the control method according to any one of claims 1 to 5, wherein a heat pump system of the water heater unit comprises a compressor (1), an economizer (7), an expansion valve, an evaporator (4), a four-way valve (3), a condenser (13), a circulating water path and a water tank, the water heater unit is characterized in that the compressor (1) is connected with the condenser (13) through the four-way valve (3) to form an exhaust pipeline, the condenser (13) is connected with the evaporator (4) through a main pipeline of the economizer (7) to form a circulating pipeline, the evaporator (4) is connected with the compressor (1) through the four-way valve (3) to form an air inlet pipeline, and the compressor (1) is connected with the condenser (13) and an auxiliary pipeline of the economizer (7) through the four-way valve (3) in a circulating manner to form an; an oil separator (2) connected with an air inlet pipeline is arranged on an exhaust pipeline between the compressor (1) and the four-way valve (3);
an oil separator inlet (201) of the oil separator (2) is connected with a compressor exhaust port (101), an oil separator outlet (202) is connected with a first connector (301) of the four-way valve, a capillary tube (14) is arranged between a passive oil return port (203) of the oil separator and an air inlet pipeline of the compressor (1) to form a passive oil return pipeline, and an active oil return port (204) of the oil separator is connected with the air inlet pipeline of the compressor (1) and is provided with a second electromagnetic valve (11) to form an active oil return pipeline;
a condenser inlet (1301) of the condenser pipe (13) is connected with a fourth interface (304) of the four-way valve, and a condenser outlet (1302) of the condenser pipe is respectively connected with a main road and an auxiliary road of the economizer (7); the auxiliary path of the economizer (7) is connected with the air supplement port (103) of the compressor, and a first electromagnetic valve (8) and a second expansion valve (9) are sequentially arranged on a pipeline from the outlet (1302) of the condensation pipe to the auxiliary path of the economizer (7);
the compressor (1) is an enhanced vapor injection compressor, and an exhaust temperature sensor is arranged at an exhaust port (1) of the compressor.
7. The split type low-temperature heat pump water heater unit according to claim 6, wherein the main path of the economizer (7) is connected with the inlet of the evaporator (4), the outlet of the evaporator (4) is connected with the second interface (302) of the four-way valve, and the pipeline from the main path of the economizer (7) to the inlet of the evaporator (4) is sequentially provided with the filter (5), the first expansion valve (6) and the filter (5).
8. The split type low-temperature heat pump water heater unit according to claim 6, wherein the air inlet pipe of the compressor (1) is formed by connecting an outlet of the evaporator (4), a second interface (302) of a four-way valve, a third interface (303) of the four-way valve, a gas-liquid separator (10) and an inlet (102) of the compressor; the interfaces of the passive oil return pipeline and the active oil return pipeline and the air inlet pipeline are arranged between the gas-liquid separator (10) and the inlet (102) of the compressor.
9. The split low temperature heat pump water heater unit according to claim 6, wherein the water tank is provided with a water temperature sensor.
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