CN209819920U - Two-stage heat pump system - Google Patents
Two-stage heat pump system Download PDFInfo
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- CN209819920U CN209819920U CN201920013766.1U CN201920013766U CN209819920U CN 209819920 U CN209819920 U CN 209819920U CN 201920013766 U CN201920013766 U CN 201920013766U CN 209819920 U CN209819920 U CN 209819920U
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Abstract
The utility model discloses a two-stage heat pump system, which comprises a first circulation loop, a second circulation loop, a third circulation loop and a fourth circulation loop; the first circulation loop comprises a primary evaporator, a primary compressor, a primary condenser and a primary throttling component which are connected in a circulating manner; the second circulation loop comprises a primary condenser, a buffer tank, a secondary condenser and a secondary evaporator primary condenser which are in circulation connection; the third pipeline is sequentially connected with a system circulating pump and an expansion tank; a switching valve is connected between the first pipeline and the second pipeline; the third circulation loop comprises a secondary evaporator, a secondary compressor, a secondary condenser and a secondary throttling part which are connected in a circulating manner; the fourth circulation loop comprises a secondary condenser, a heating tail end water supply pipeline, a user heating side inlet, a user heating side outlet and a user tail end water return pipeline which are in circulation connection; the user tail end water return pipeline is connected with a tail end circulating water pump. The utility model discloses an operating efficiency is high, can satisfy the severe cold weather and use to can provide 70 ℃ heating water.
Description
Technical Field
The utility model relates to a heat pump heating field, in particular to doublestage heat pump system.
Background
The heat pump is a device for transferring the heat energy of a low-level heat source to a high-level heat source, and the air source heat pump products in the current market mainly have the following problems: 1. the heat supply capacity is sharply reduced under severe cold environment conditions, and even heat supply cannot be provided; 2. the heat pump of the cascade system can not realize the refrigeration function and has lower comprehensive energy efficiency.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to provide a two-stage heat pump system with high overall operation efficiency and a control method thereof,
in order to realize the purpose, the utility model adopts the technical scheme that:
a two-stage heat pump system comprises a first circulation loop, a second circulation loop, a third circulation loop, a fourth circulation loop and a primary evaporator;
the primary evaporator is connected with a primary compressor, the primary compressor is connected with a first channel of a primary condenser, the first channel of the primary condenser is connected with a primary throttling component, and the primary throttling component is connected with the primary evaporator to form a first circulation loop;
the outlet of the second channel of the primary condenser is connected with a buffer tank, the buffer tank is connected with the inlet of the first channel of the secondary condenser through a first pipeline, the outlet of the first channel of the secondary condenser is connected with the first channel of the secondary evaporator through a second pipeline, and the outlet of the first channel of the secondary evaporator is connected with the inlet of the second channel of the primary condenser through a third pipeline to form a second circulation loop; the third pipeline is sequentially connected with a system circulating pump P2 and an expansion tank; the outlet of the buffer tank is provided with a three-way valve or is connected with two switching valves, the three-way valve is arranged between the buffer tank and the first pipeline, and the three-way valve is connected with the second pipeline; a first switching valve is connected between the first pipeline and the second pipeline, and a second switching valve is connected on a pipeline of the switching valve, which is connected with the secondary condenser;
a second channel outlet of the secondary evaporator is connected with a second channel inlet of the secondary condenser through a secondary compressor, and a second channel outlet of the secondary condenser is connected with a second channel inlet of the secondary evaporator through a secondary throttling part to form a third circulation loop;
a third channel outlet of the secondary condenser is connected with a heating tail end water supply pipeline, the heating tail end water supply pipeline is connected with an inlet of a user heating side, and an outlet of the user heating side is connected with a third channel inlet of the secondary condenser through a user tail end water return pipeline to form a fourth circulation loop; and the user tail end water return pipeline is connected with a tail end circulating water pump.
An electric heater is arranged in the buffer tank.
The secondary condenser is a three-channel plate-exchange or double-coil shell-and-tube heat exchanger.
The first circulation loop is used for placing ultra-low temperature refrigerant, and the second circulation loop and the third circulation loop are used for placing high-temperature refrigerant.
The first switching valve and the second switching valve are electric valve switching valves, and the three-way valve is an electric three-way valve.
A first temperature detector is arranged on the third pipeline; a second temperature detector is arranged on the buffer tank; a third temperature detector is arranged on the second pipeline; a fourth temperature detector is arranged on the heating tail end water supply pipeline; and a fifth temperature detector is arranged on the user tail end water return pipeline.
The utility model also provides a control method of foretell doublestage heat pump system, including following step:
two-stage heating working condition: opening the first, second, third and fourth circulation loops, opening the first switching valve, and closing the second switching valve; the heat in the air is absorbed by the primary evaporator, and is transferred to the second circulation loop through the primary condenser after being heated by the primary compressor; transferring the heat of the first circulation loop to a third circulation loop through a secondary evaporator, raising the temperature through a secondary compressor, and transferring the heat to a fourth circulation loop through a secondary condenser for heating a user;
single-stage heating working condition: opening the first, second and fourth circulation loops, opening the second switching valve, closing the first switching valve, absorbing heat in air through the primary evaporator, raising the temperature through the primary compressor, and transmitting the heat to the second circulation loop through the primary condenser; the antifreeze solution in the second circulation loop is used as a heat-conducting medium, and the heat of the first circulation loop is transferred to a fourth circulation loop through a secondary condenser for heating users;
defrosting condition: closing the third and fourth circulation loops, opening the first and second circulation loops, opening the first switching valve, closing the second switching valve, extracting heat in the anti-freezing medium extraction buffer tank of the second circulation loop, transferring the heat to the primary condenser, sending the heat to the primary evaporator through the primary compressor, and releasing the heat for defrosting; when the heat stored in the buffer tank is insufficient, starting an electric heater in the buffer tank to supplement the heat;
refrigeration working condition: closing the third circulation loop, opening the first, second and fourth circulation loops, opening the second switching valve, and closing the first switching valve; the first circulation loop operates in reverse to absorb heat from the user compartment and dissipate the heat from the air through the primary evaporator.
Further, when the temperature detected by the fifth temperature detector is lower than a first set starting value, a double-stage heating working condition or a single-stage heating working condition is selected to be started;
when the temperature detected by the fifth temperature detector is higher than or equal to the first set stop value, stopping the double-stage heating working condition or the single-stage heating working condition;
under the working condition of double-stage heating, when the temperature detected by the third temperature detector is lower than a set temperature value (for example, 15 ℃), the control system suspends the work of the third circulation loop; when the temperature value of the third temperature detector is higher than or equal to the set temperature value (for example, 18 ℃), the control system starts the third circulation loop to work normally;
when the temperature detected by the fifth temperature detector is higher than a second set starting value, starting a refrigeration working condition; and when the temperature of the fifth temperature detector point is lower than or equal to the second set stop value, the refrigeration working condition is closed.
The first set starting value is 20-55 ℃; the first set stop value is 25-60 ℃; the set temperature value is 10-25 ℃; the second set starting value is 10-30 ℃; the second set stop value is 7-25 ℃.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
utility model discloses a two compressors realize the doublestage heat pump heating of two-stage compression, can guarantee that heat pump system reliably works under cold environmental condition to obtain very high comprehensive operating efficiency in whole season of heating, the while system still can be used to refrigerate, reduces equipment idle time, improve equipment utilization rate. The utility model discloses an adopt antifreeze solution as heat transfer circulating medium still can effectively improve equipment's frost resistance in the system, can satisfy the severe cold weather and use and can provide 70 ℃ heating water.
Drawings
Fig. 1 is a system schematic diagram of a dual-stage heat pump system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a dual-stage heating operation of a dual-stage heat pump system according to an embodiment of the present invention;
fig. 3 is a single-stage heating operation schematic diagram of a dual-stage heat pump system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of defrosting operation of a dual-stage heat pump system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a single-stage refrigeration operation of a dual-stage heat pump system according to an embodiment of the present invention.
In the figure:
the system comprises a primary evaporator 1, a primary compressor 2, a primary condenser 3, a primary throttling component 4, a buffer tank 5, a first pipeline 6, a secondary condenser 7, a second pipeline 8, a secondary evaporator 9, a third pipeline 10, a system circulating pump 11, an expansion tank 12, a first switching valve 13, a secondary compressor 14, a secondary throttling component 15, a heating tail end water supply pipeline 16, a user tail end water return pipeline 17, a tail end circulating water pump 18, an electric heater 19, a first temperature detector 20, a second temperature detector 21, a third temperature detector 22, a fourth temperature detector 23, a fifth temperature detector 24, a second switching valve 25 and a three-way valve 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a two-stage heat pump system includes a first circulation loop, a second circulation loop, a third circulation loop, a fourth circulation loop, and a primary evaporator 1;
the primary evaporator 1 is connected with a primary compressor 2, the primary compressor 2 is connected with a first channel of a primary condenser 3, the first channel of the primary condenser 3 is connected with a primary throttling part 4, and the primary throttling part 4 is connected with the primary evaporator 1 to form a first circulation loop;
the outlet of the second channel of the primary condenser 3 is connected with a buffer tank 5, the buffer tank 5 is connected with the inlet of the first channel of a secondary condenser 7 through a first pipeline 6, the outlet of the first channel of the secondary condenser 7 is connected with the first channel of a secondary evaporator 9 through a second pipeline 8, the outlet of the first channel of the secondary evaporator 9 is connected with the inlet of the second channel of the primary condenser 3 through a third pipeline 10, and a second circulation loop is formed; the third pipeline 10 is connected with a system circulating pump 11 and an expansion tank 12 in sequence; a three-way valve 26 is arranged at the outlet of the buffer tank 5 or two switching valves are connected, the three-way valve 26 is arranged between the buffer tank 5 and the first pipeline 6, and the three-way valve 26 is connected with the second pipeline 8; a first switching valve 13 is connected between the first pipeline 6 and the second pipeline 8, and a second switching valve 25 is connected to a pipeline of the first switching valve 13 connected with the secondary condenser 7;
a second channel outlet of the secondary evaporator 9 is connected with a second channel inlet of the secondary condenser 7 through a secondary compressor 14, and a second channel outlet of the secondary condenser 7 is connected with a second channel inlet of the secondary evaporator 9 through a secondary throttling part 15 to form a third circulation loop;
a third channel outlet of the secondary condenser 7 is connected with a heating tail end water supply pipeline 16, the heating tail end water supply pipeline 16 is connected with an inlet of a user heating side, and an outlet of the user heating side is connected with a third channel inlet of the secondary condenser 7 through a user tail end water return pipeline 17 to form a fourth circulation loop; the user end water return pipe 17 is connected with an end water circulating pump 18.
The utility model discloses a two compressors realize the two-stage compression, use doublestage heat pump heating, can guarantee that heat pump system reliably works under cold environmental condition to obtain very high comprehensive operating efficiency in whole heating season, the while system still can be used to refrigerate, reduces equipment idle time, improve equipment utilization rate. The compressors of the two-stage heat pump system are two independent compressors, and can be connected in series to run in a two-stage mode, or can run in a single-stage mode in which the primary compressor runs and the secondary compressor stops.
Further, in order to ensure the stable operation of the system and prevent the insufficient heat during defrosting of the system, an electric heater 19 is arranged in the buffer tank 5.
Preferably, the secondary condenser 7 is of a three-channel plate-and-tube construction. Or may be a double coil shell and tube heat exchanger.
The secondary condenser of the utility model adopts the three-channel plate heat exchanger to realize heat exchange, which can ensure that the heat transfer medium of the two-stage heat pump system is completely separated from the heat transfer medium of the end pipeline system, the medium in the system is the antifreezing medium, thereby preventing the circulating pump from being frozen and damaged, and the circulating pump can not be condensed at low temperature, thereby reducing the complexity of the antifreezing control in the system; the end medium is water for user heating. The three channels have the functions of a secondary heat pump refrigerant channel, a second loop circulating medium channel and a tail end heating channel respectively.
Preferably, the first circulation circuit is used for placing ultra-low temperature refrigerant, and the third circulation circuit is used for placing high temperature refrigerant. The second circulation loop is used for placing antifreeze.
The ultra-low temperature refrigerant is preferably R410A refrigerant; the refrigerant of high temperature is preferably R134a refrigerant. The system of the utility model can stably provide 70 ℃ hot water at-40 ℃ ambient temperature.
For automatic control, the first switching valve 13 and the second switching valve 25 are electric-operated switching valves, and the three-way valve 26 is an electric-operated three-way valve.
The utility model discloses a two-way valves or a three-way valve realize automatic switch-over and control system's circulation.
In the second circulation loop, an electric valve is added in a pipeline connecting an outlet of the buffer tank and an inlet of a circulation medium of the secondary evaporator so as to realize the switching of the functions of the circulation loop, and the second circulation loop can be specifically divided into a single-stage heating circulation loop, a refrigeration circulation loop, defrosting circulation and a double-stage heating intermediate circulation loop.
Preferably, in order to realize the automatic operation control of the system, the third pipeline 10 is provided with a first temperature detector 20; a second temperature detector 21 is arranged on the buffer tank 5; a third temperature detector 22 is arranged on the second pipeline 8; a fourth temperature detector 23 is arranged on the heating tail end water supply pipeline 16; a fifth temperature detector 24 is arranged on the user end water return pipeline 17.
The temperature parameters can be set according to the system by collecting the temperatures of the fifth temperature detector and the third temperature detector, so that the functions of automatic heating of the system, anti-freezing of a pipeline at the tail end of the system and the like are realized; the second temperature detector is arranged in the buffer tank, and the electric heater can be automatically started or stopped according to the set temperature of the system by acquiring the temperature of the second temperature detector. The first temperature probe 20 may be used to display the temperature of the anti-icing liquid in the second circulation circuit. The temperature of a fourth temperature detector of the tail end water supply pipeline is mainly used for displaying the temperature of the supplied water.
The utility model also provides a control method of foretell doublestage heat pump system, including following step:
referring to fig. 2, the dual-stage heating condition: when the temperature detected by the fifth temperature detector 24 is lower than a first set starting value (e.g., 30 ℃), opening the first, second, third, and fourth circulation loops, opening the first switching valve 13, and closing the second switching valve 25; the first circulation loop is a first-stage energy source of the two-stage heat pump system, absorbs heat in air through the primary evaporator 1, is heated through the primary compressor 2, and then is transferred to the second circulation loop through the primary condenser 3; transferring the heat of the first circulation loop to a third circulation loop through a secondary evaporator 9, raising the temperature through a secondary compressor 14, and transferring the heat to a fourth circulation loop through a secondary condenser 7 for heating a user; when the temperature detected by the fifth temperature detector 24 is higher than or equal to a first set stop value (e.g., 35 c), the system stops operating. Under the working condition, when the temperature detected by the third temperature detector is lower than a set temperature value (for example, 15 ℃), the control system suspends the work of the third circulation loop so as to protect a secondary evaporator in the third circulation system from being frozen due to the fact that the temperature is too low. When the temperature detected by the third temperature detector 22 is higher than or equal to the set temperature (for example, 18 ℃), the control system will automatically start the third circulation loop to work normally.
Referring to fig. 3, a single stage heating condition: opening the first, second and fourth circulation loops, opening the second switching valve 25, closing the first switching valve 13, absorbing heat in the air by the primary evaporator 1 when the temperature detected by the fifth temperature detector 24 is lower than a second set starting value (e.g., 30 ℃), raising the temperature by the primary compressor 2, and transferring the heat to the second circulation loop by the primary condenser 3; the antifreeze solution in the second circulation loop is used as a heat-conducting medium, and the heat of the first circulation loop is transferred to a fourth circulation loop through a secondary condenser 7 for heating users; when the temperature detected by the fifth temperature detector 24 is higher than or equal to a second set stop value (e.g., 35 c), the system stops operating.
Referring to fig. 4, the defrosting condition: closing the third and fourth circulation loops, opening the first and second circulation loops, opening the first switching valve 13, and closing the second switching valve 25; the heat in the antifreezing medium extraction buffer tank 5 of the second circulation loop is transferred to the primary condenser 3, and then is sent into the primary evaporator 1 through the primary compressor 2 and releases the heat for defrosting; when the heat stored in the buffer tank 5 is insufficient, the electric heater 19 in the buffer tank 5 is started to supplement the heat, so that the defrosting is smoothly finished;
referring to fig. 5, the refrigeration condition: closing the third circulation loop, opening the first, second and fourth circulation loops, opening the second switching valve 25, closing the first switching valve 13; when the temperature detected by the fifth temperature detector 24 is higher than a preset starting value (for example, 25 ℃), the first circulation loop operates in reverse, absorbs heat from the user room and dissipates heat to the air through the primary evaporator 1, so as to achieve the purpose of refrigerating the user. When the temperature detected by the fifth temperature detector 24 is lower than or equal to a set stop value (e.g., 18 c), the system stops operating.
When the temperature detected by the fifth temperature detector 24 is lower than the set anti-freezing protection temperature value (for example, 4 ℃) by the system, the system automatically starts the anti-freezing function, such as anti-freezing circulation, anti-freezing electric tracing band and the like. When the temperature detected by the fifth temperature detector 24 is higher than or equal to the system set anti-freeze protection stop temperature value (e.g., 10 ℃), the system automatically stops the anti-freeze function.
The utility model discloses a doublestage heat pump system can be according to single doublestage mode of ambient temperature automatic adjustment under the heating state, guarantees that the system remains high-efficient stable work all the time. If a three-way valve is adopted, when the working condition is adopted, the circulation needing to be opened is correspondingly opened.
In the embodiment of the present invention, when the temperature detected by the fifth temperature detector 24 is lower than the first set starting value, the two-stage heating operation mode or the single-stage heating operation mode is selected to be turned on;
when the temperature detected by the fifth temperature detector 24 is higher than or equal to the first set stop value, the two-stage heating working condition or the single-stage heating working condition is stopped;
under the working condition of double-stage heating, when the temperature detected by the third temperature detector is lower than a set temperature value, the control system suspends the work of the third circulation loop; when the temperature value of the third temperature detector is higher than or equal to the set temperature value, the control system starts the third circulation loop to work normally;
when the temperature detected by the fifth temperature detector is higher than a second set starting value, starting a refrigeration working condition; and when the temperature of the fifth temperature detector point is lower than or equal to the second set stop value, the refrigeration working condition is closed.
The first set starting value is 20-55 ℃, preferably 30 ℃, 18 ℃, 20 ℃, 25 ℃, 31 ℃, 40 ℃, 45 ℃, 50 ℃ or 55 ℃, and can be selected according to the requirement; the first set stop value is 25-60 ℃, preferably 31 ℃, 32 ℃, 33 ℃, 34 ℃, 35 ℃, 45 ℃, 55 ℃ or 60 ℃, and can be selected as required; the set temperature value is 10-25 ℃, preferably 15 ℃, 16 ℃, 20 ℃, 17 ℃, 18 ℃, 20 ℃, 22 ℃ or 25 ℃, and can be selected according to the requirements of actual conditions; the second set starting value is 10-30 ℃, preferably 23 ℃, 24 ℃, 25 ℃, 26 ℃ or 27 ℃, and can be selected according to requirements; the second set stop value is 7-25 deg.C, preferably 15 deg.C, 16 deg.C, 17 deg.C, 18 deg.C or 20 deg.C, and can be selected as desired.
The first set starting value is 20-55 ℃; the first set stop value is 25-60 ℃; the set temperature value is 10-25 ℃; the second set starting value is 10-30 ℃; the second set stop value is 7-25 ℃.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A two-stage heat pump system is characterized by comprising a first circulation loop, a second circulation loop, a third circulation loop, a fourth circulation loop and a primary evaporator;
the primary evaporator is connected with a primary compressor, the primary compressor is connected with a first channel of a primary condenser, the first channel of the primary condenser is connected with a primary throttling component, and the primary throttling component is connected with the primary evaporator to form a first circulation loop;
the outlet of the second channel of the primary condenser is connected with a buffer tank, the buffer tank is connected with the inlet of the first channel of the secondary condenser through a first pipeline, the outlet of the first channel of the secondary condenser is connected with the first channel of the secondary evaporator through a second pipeline, and the outlet of the first channel of the secondary evaporator is connected with the inlet of the second channel of the primary condenser through a third pipeline to form a second circulation loop; the third pipeline is sequentially connected with a system circulating pump and an expansion tank; the outlet of the buffer tank is provided with a three-way valve or is connected with two switching valves, the three-way valve is arranged between the buffer tank and the first pipeline, and the three-way valve is connected with the second pipeline; a first switching valve is connected between the first pipeline and the second pipeline, and a second switching valve is connected on a pipeline of the first switching valve, which is connected with the secondary condenser;
a second channel outlet of the secondary evaporator is connected with a second channel inlet of the secondary condenser through a secondary compressor, and a second channel outlet of the secondary condenser is connected with a second channel inlet of the secondary evaporator through a secondary throttling part to form a third circulation loop;
a third channel outlet of the secondary condenser is connected with a heating tail end water supply pipeline, the heating tail end water supply pipeline is connected with an inlet of a user heating side, and an outlet of the user heating side is connected with a third channel inlet of the secondary condenser through a user tail end water return pipeline to form a fourth circulation loop; and the user tail end water return pipeline is connected with a tail end circulating water pump.
2. The dual stage heat pump system of claim 1, wherein an electric heater is disposed within the surge tank.
3. The dual stage heat pump system of claim 1, wherein the secondary condenser is a three channel plate-and-tube or a two coil shell and tube heat exchanger.
4. The dual stage heat pump system of any of claims 1-3, wherein the first circulation loop is configured to hold an ultra low temperature refrigerant; the third circulation loop is used for placing high-temperature refrigerant.
5. The dual stage heat pump system of claim 4, wherein the first and second switching valves are electrically operated valve switching valves and the three-way valve is an electrically operated three-way valve.
6. The dual stage heat pump system of claim 4, wherein the third conduit is provided with a first temperature probe; a second temperature detector is arranged on the buffer tank; a third temperature detector is arranged on the second pipeline; a fourth temperature detector is arranged on the heating tail end water supply pipeline; and a fifth temperature detector is arranged on the user tail end water return pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920013766.1U CN209819920U (en) | 2019-01-04 | 2019-01-04 | Two-stage heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920013766.1U CN209819920U (en) | 2019-01-04 | 2019-01-04 | Two-stage heat pump system |
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| Publication Number | Publication Date |
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| CN209819920U true CN209819920U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920013766.1U Withdrawn - After Issue CN209819920U (en) | 2019-01-04 | 2019-01-04 | Two-stage heat pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813005A (en) * | 2019-01-04 | 2019-05-28 | 北京四季通能源科技有限公司 | A kind of Two-stage Heat Pump System and its control method |
-
2019
- 2019-01-04 CN CN201920013766.1U patent/CN209819920U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813005A (en) * | 2019-01-04 | 2019-05-28 | 北京四季通能源科技有限公司 | A kind of Two-stage Heat Pump System and its control method |
| CN109813005B (en) * | 2019-01-04 | 2023-09-22 | 北京四季通能源科技有限公司 | Double-stage heat pump system and control method thereof |
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