CN218544553U - Water source heat pump unit - Google Patents
Water source heat pump unit Download PDFInfo
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- CN218544553U CN218544553U CN202222818262.1U CN202222818262U CN218544553U CN 218544553 U CN218544553 U CN 218544553U CN 202222818262 U CN202222818262 U CN 202222818262U CN 218544553 U CN218544553 U CN 218544553U
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Abstract
The utility model discloses a water source heat pump set. The water source heat pump unit comprises an oil separator, a liquid storage tank, a gas-liquid separator and a water preheating system, wherein the water preheating system comprises a heat source, a flow regulating valve, a coil pipe and a one-way valve, the flow regulating valve is sequentially communicated with the oil separator, the liquid storage tank and the coil pipe are arranged in the gas-liquid separator, the coil pipe is used for introducing hot water into the coil pipe, and the water source heat pump unit is used for heating a refrigerant in the oil separator, the liquid storage tank and the gas-liquid separator when being started at a low temperature state. The utility model provides a water source heat pump system can heat supply fast when the low temperature starts, reaches the effect that promotes user experience.
Description
Technical Field
The utility model relates to an air conditioning technology field especially relates to a water source heat pump set.
Background
Compared with an air source heat pump unit, the water source heat pump unit has the advantages of high energy efficiency, small occupied area, good economic return rate and the like which cannot be compared with an air source multi-connected unit, particularly the economic return rate, the total cost (initial investment and operation cost) of the water source heat pump unit is lower than that of the air source heat pump unit after the water source heat pump unit operates for about 1.5 years. Due to the characteristic, the market share of the current water source heat pump is increased year by year.
The existing water source heat pump is generally placed in a machine room or outdoors, and when the heat pump is used for heating, high-temperature and high-pressure gaseous refrigerant discharged by a compressor directly enters an indoor heat exchanger to exchange heat with indoor air, and the condensation heat of the high-temperature and high-pressure gaseous refrigerant is discharged to the indoor side. However, during a period of shutdown or standby time (more than 4 hours) caused by holidays in winter or shutdown maintenance and other factors, the temperature of the unit is relatively low, for example, the outdoor temperature in northern areas of china can reach below-20 ℃, and at this time, the gaseous refrigerant in the system is gradually condensed due to the reduction of the external environment temperature to form a liquid refrigerant. After being placed for a long time, the liquid refrigerant is mainly concentrated in the liquid storage tank, the gas-liquid separator and the oil separator. When the unit is started to operate, the compressor heats low-temperature liquid refrigerant at first in the working initial stage, and the liquid refrigerant is in the gas-liquid separator, the liquid storage tank and the oil separator, so that the suction amount of the refrigerant into the compressor is small, the heat loss in pipelines and components is large, the heating effect is poor, heat cannot be supplied to the indoor side for a period of time, the heating time is prolonged, and the user experience and the heating effect are affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a water source heat pump set to solve the long technical problem of low temperature state start-up heat supply time that exists among the prior art.
The utility model provides a water source heat pump set includes oil separator, liquid storage pot, vapour and liquid separator and a water preheating system, it is right that water preheating system is used for water source heat pump set when low temperature state starts oil separator the liquid storage pot with refrigerant in the vapour and liquid separator heats.
The water preheating system comprises a heat source, a flow regulating valve, a coil pipe and a one-way valve, wherein the flow regulating valve is sequentially communicated through a pipeline, the coil pipe is positioned in the oil separator, the liquid storage tank and the gas-liquid separator, and the pipeline introduces hot water into the coil pipe to heat a refrigerant.
The heat source of the water preheating system is an electric heater, a boiler or high-pressure exhaust of part of a heat pump unit.
The water source heat pump unit comprises a compressor, an oil separator, a four-way valve, an outdoor heat exchanger, an electronic expansion valve and a liquid storage tank which are communicated through pipelines.
Furthermore, a first branch is led out from a high-pressure air inlet pipeline of the four-way valve, the other end of the first branch is communicated with the liquid storage tank, and a pressure valve is arranged on the first branch.
Furthermore, an oil return temperature sensor, a preferential electromagnetic valve and a pressure reduction device are arranged on an oil return pipeline of the oil separator.
Furthermore, an outlet pipe temperature sensor is arranged on a gas outlet pipeline of the gas-liquid separator.
Preferably, the outdoor heat exchanger is a water-cooled plate heat exchanger, and a refrigerant inlet pipe temperature sensor is arranged on a refrigerant inlet pipeline of the water-cooled plate heat exchanger.
Furthermore, the water source heat pump system also comprises a subcooler, the outlet of the liquid storage tank is divided into two branches, one branch enters the subcooler and is communicated with the indoor unit through a valve, and the other branch enters the subcooler after passing through the electronic expansion valve of the air cooler and is communicated with the gas-liquid separator through a second branch.
Furthermore, a supercooling electromagnetic valve is arranged on the second branch, a third branch is led out between the supercooling electromagnetic valve and the subcooler, the other end of the third branch is communicated with an air supplementing port of the compressor, and an enthalpy spraying valve is arranged on the third branch.
The utility model discloses increase one set of water preheating system in current water source heat pump system, preheat the refrigerant in vapour and liquid separator, liquid storage pot and the oil separator when the unit low temperature starts to reach the purpose that the unit can heat fast after low temperature is placed for a long time, promote the effect of user experience and quick heat supply.
Drawings
The invention is described in detail below with reference to the following figures and specific embodiments, wherein:
FIG. 1 is a system diagram of a water source heat pump unit according to the present invention;
fig. 2 is a flowchart of a low-temperature start preheating control method provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is described in detail with reference to the accompanying drawings and embodiments. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
As shown in figure 1, the water source heat pump unit comprises a compressor 1, an oil separator 2, a four-way valve 3, an outdoor heat exchanger 4, an electronic expansion valve 5, a liquid storage tank 6 and a gas-liquid separator 14 which are communicated through pipelines. Preferably, the outdoor heat exchanger 4 is a water-cooled plate heat exchanger, and a pipe inlet temperature sensor 16 is arranged on a refrigerant inlet pipeline of the water-cooled plate heat exchanger. A one-way valve 7 is arranged on a high-pressure pipeline from the outlet of the oil separator to the four-way valve, a high-pressure sensor 9 is arranged at the outlet of the one-way valve, a first branch 8 is led out of the outlet pipeline of the one-way valve, the other end of the first branch is communicated with a liquid storage tank 6, and a pressure valve 10 is arranged at the position, close to the liquid storage tank, of the first branch. The first branch is used for filling gas refrigerant into the liquid storage tank when the refrigerant in the pipeline is insufficient, and pressurizing the liquid storage tank so as to press the refrigerant in the liquid storage tank out of the system pipeline. An oil return temperature sensor 11 and an oil return electromagnetic valve 12 are arranged on an oil return pipeline of the oil separator 2. The return oil is depressurized by the pressure reducing device 13 and then returns to the compressor 1. The gas outlet of the gas-liquid separator 14 is communicated with the suction port of the compressor through a pipeline, and the gas outlet pipeline is provided with a discharge pipe temperature sensor 15.
Furthermore, the water source heat pump system also comprises a subcooler 17, the outlet of the liquid storage tank 6 is divided into two branches, one branch enters the subcooler 17 and then is communicated with the indoor unit through a valve, and the other branch enters the subcooler after being cooled by the electronic expansion valve 18 of the cooler and then is communicated with the gas-liquid separator 14 through a second branch 19. The second branch is provided with a supercooling electromagnetic valve 20, a third branch 21 is led out between the supercooling electromagnetic valve and the subcooler, the other end of the third branch is communicated with an air supplement port of the compressor 1, and the third branch is provided with an enthalpy injection valve 22.
In the heating cycle, high-temperature and high-pressure gas refrigerant discharged by the compressor 1 is sent to an indoor unit for heating through the oil separator 2, the four-way valve 3 and the valve, medium-temperature and high-pressure liquid refrigerant returned by the indoor unit passes through the cooler 17, the liquid storage tank 6 and the electronic expansion valve 5 to the outdoor heat exchanger 4, and the refrigerant is gasified in the outdoor heat exchanger and then returns to the compressor 1 for circulation after passing through the four-way valve 3 and the gas-liquid separator 14.
When the unit is in a low-temperature state in winter and stops for a long time, a large amount of liquid refrigerants can be accumulated in the oil separator, the liquid storage tank and the gas-liquid separator, and at the moment, if a heating cycle is started, the heat supply of the system can be delayed. For solving this problem, the utility model discloses increased one set of water preheating system on current heat pump system's basis, used hot water to heat the refrigerant in vapour and liquid separator, liquid storage pot and the oil separator to realize that the unit can produce the heating effect fast when starting after low temperature is placed for a long time.
As shown in FIG. 1, the water preheating system provided by the present invention is shown by dotted lines in the figure, and comprises a flow control valve 23, a coil pipe 24 located at the bottom of the oil separator, the liquid storage tank and the gas-liquid separator, which are sequentially communicated through a pipeline, wherein a check valve 25 is arranged on the pipeline of the water system. The heat source of the water preheating system can be an external electric heater, a boiler or high-pressure exhaust of part of a heat pump unit. Water in the preheated water system enters the system through the water inlet side after being heated, flows to the liquid storage tank 6 through the flow regulating valve 23, then flows to the gas-liquid separator 14, passes through the oil separator 2, is discharged from the water outlet side, and returns to a heat source. A water pump is also arranged in the preheated water system. The preheated water is usually heated to 20 ℃.
Fig. 2 is a flow chart of the low-temperature start preheating control method of the present invention.
The water preheating system is turned on when the following conditions are simultaneously established:
the shutdown time is greater than a first set time t1;
detecting that the temperature of a refrigerant inlet pipe of the outdoor heat exchanger is lower than a first set temperature T1 continuously for T2;
detecting that the outlet pipe temperature of the gas-liquid separator is lower than a second set temperature T2 continuously for T3;
detecting that the oil return temperature is lower than a third set temperature T3 continuously for T4;
and detecting that the temperature of the inlet water is greater than or equal to a fourth set temperature T4 continuously for T5.
When the water preheating system is started, the following steps are executed:
s1, keeping the opening of a water quantity regulating valve to be P1 in a continuous time t 6;
s2, judging whether the saturation temperature corresponding to the condensation pressure of the system is less than or equal to a set value C1, if so, keeping the current opening of the water quantity regulating valve; if not, the opening P2 of the water quantity regulating valve is reduced;
s3, continuously operating time t7, judging whether the saturation temperature corresponding to the condensation pressure of the system is larger than or equal to a set value C2, and if so, reducing the opening P3 of the water quantity regulating valve; if not, keeping the current opening unchanged;
s4, continuously operating time t8, and judging whether the saturation temperature corresponding to the condensation pressure of the system is greater than or equal to a set value C3, if so, reducing the opening P4 of the water quantity regulating valve; if not, the current opening degree is kept unchanged.
And the steps are carried out until the water flow regulating valve is closed and the water preheating operation is finished.
When the water preheating system operates, the subcooler electromagnetic valve 23 and the oil return electromagnetic valve 12 are opened, and the heating electronic expansion valve, the indoor machine electronic expansion valve, the enthalpy spraying valve and the subcooler electronic expansion valve are all adjusted to the maximum opening degree according to the system target capacity and the target high-pressure control frequency.
The water preheating system is switched off when any of the following conditions is met:
the continuous operation time of the heat pump unit is more than or equal to t9;
detecting that the saturation temperature corresponding to the condensing pressure of the system is greater than or equal to a set value C4 within the continuous time t 10;
the system shuts down, or shuts down to a temperature set point.
In one embodiment, the circulation of the water preheating system is controlled in the following modes:
starting the water preheating system to operate when the system detects that the following conditions are simultaneously met: the shutdown time is more than or equal to 5 hours, the temperature of the refrigerant inlet pipe is less than 5 ℃, the temperature of the gas-liquid separator outlet pipe is less than 5 ℃, the oil return temperature is less than 5 ℃, and the water inlet temperature is more than or equal to 20 ℃.
After entering water preheating operation, the water quantity regulating valve 23 is opened, hot water enters the liquid storage tank 6, the gas-liquid separator 14 and the oil separator 2 in sequence, and heat exchange is carried out with a refrigerant through a coil pipe 24 arranged in the components. In operation, the water quantity regulating valve is controlled according to the high-pressure feedback of the system, and when the high pressure meets a certain condition, the water quantity regulating valve is closed.
When the heat pump system detects that the water preheating circulation is carried out, the subcooler electromagnetic valve 20 and the oil return electromagnetic valve 12 are opened, and the electronic expansion valve 5, the internal machine electronic expansion valve, the enthalpy spraying valve 22 and the subcooler electronic expansion valve 18 are all adjusted to the maximum opening degree by the compressor according to the target capacity and the target high-pressure control frequency of the system.
Controlling the water preheating circulation to end when the system detects that any one of the following conditions is met: the continuous running time of the unit is more than or equal to 30 minutes, or the saturation temperature corresponding to the condensing pressure of the system is more than or equal to 40 ℃, or the system is shut down when the set temperature point is reached.
The utility model provides a take heat pump of low temperature start preheated water system can be used to ordinary air cooled heat pump, water source heat pump and the many online of water source.
The foregoing is only illustrative of the present invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the invention.
Claims (10)
1. A water source heat pump unit comprises an oil separator, a liquid storage tank and a gas-liquid separator and is characterized by further comprising a water preheating system used for heating refrigerants in the oil separator, the liquid storage tank and the gas-liquid separator when the water source heat pump unit is started in a low-temperature state.
2. The waterhead heat pump unit as claimed in claim 1, wherein the water preheating system comprises a heat source, a flow regulating valve, a coil pipe and a one-way valve, wherein the flow regulating valve, the coil pipe and the one-way valve are sequentially communicated through a pipeline, the coil pipe is positioned in the oil separator, the liquid storage tank and the gas-liquid separator, and the pipeline introduces hot water into the coil pipe to heat a refrigerant.
3. The waterhead heat pump unit of claim 2, wherein the heat source of the water preheating system is an electric heater, a boiler, or a part of high-pressure exhaust gas of the heat pump unit.
4. The water source heat pump unit as set forth in claim 1, comprising a compressor, an oil separator, a four-way valve, an outdoor heat exchanger, an electronic expansion valve and a liquid storage tank which are connected by pipes.
5. The waterhead heat pump unit as claimed in claim 4, wherein a first branch is led out from the high pressure inlet pipeline of the four-way valve, the other end of the first branch is communicated with the liquid storage tank, and a pressurizing valve is arranged on the first branch.
6. The waterhead heat pump unit as claimed in claim 4, wherein the oil return pipe of the oil separator is provided with an oil return temperature sensor, an electromagnetic valve and a pressure reducing device.
7. The waterhead heat pump unit as claimed in claim 4, wherein the gas outlet pipeline of the gas-liquid separator is provided with an outlet pipe temperature sensor.
8. The waterhead heat pump unit as claimed in claim 4, wherein the outdoor heat exchanger is a water-cooled plate heat exchanger, and a temperature sensor is arranged on the inlet pipe of the refrigerant.
9. The water source heat pump unit as claimed in claim 4, further comprising a subcooler, wherein the outlet of the liquid storage tank is divided into two branches, one branch enters the subcooler and then is communicated with the indoor unit through a valve, and the other branch enters the subcooler after passing through the electronic expansion valve of the subcooler and then is communicated with the gas-liquid separator through a second branch.
10. The water source heat pump unit as recited in claim 9, wherein a supercooling electromagnetic valve is provided on said second branch, a third branch is led out between said supercooling electromagnetic valve and said subcooler, the other end of said third branch is connected to the air supply port of said compressor, and an enthalpy injection valve is provided on said third branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222818262.1U CN218544553U (en) | 2022-10-25 | 2022-10-25 | Water source heat pump unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222818262.1U CN218544553U (en) | 2022-10-25 | 2022-10-25 | Water source heat pump unit |
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| Publication Number | Publication Date |
|---|---|
| CN218544553U true CN218544553U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222818262.1U Active CN218544553U (en) | 2022-10-25 | 2022-10-25 | Water source heat pump unit |
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| Country | Link |
|---|---|
| CN (1) | CN218544553U (en) |
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2022
- 2022-10-25 CN CN202222818262.1U patent/CN218544553U/en active Active
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