CN116086035A - Air conditioner capable of preventing liquid impact by low-temperature refrigeration and control method - Google Patents
Air conditioner capable of preventing liquid impact by low-temperature refrigeration and control method Download PDFInfo
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- CN116086035A CN116086035A CN202211641804.0A CN202211641804A CN116086035A CN 116086035 A CN116086035 A CN 116086035A CN 202211641804 A CN202211641804 A CN 202211641804A CN 116086035 A CN116086035 A CN 116086035A
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- 239000007788 liquid Substances 0.000 title claims abstract description 35
- 238000005057 refrigeration Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005485 electric heating Methods 0.000 claims abstract description 34
- 239000003507 refrigerant Substances 0.000 claims abstract description 27
- 238000001704 evaporation Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 238000004378 air conditioning Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioner for preventing liquid impact by low-temperature refrigeration and a control method thereof, wherein the air conditioner comprises an evaporator, a throttling device, a condenser, a compressor and an electric heating device; the exhaust end of the compressor is connected with the first port of the condenser, the second port of the condenser is connected with the first port of the evaporator through the throttling device, and the second port of the evaporator is connected with the air suction end of the compressor through the electric heating device to form a refrigeration cycle loop. According to the invention, the electric heating device is additionally arranged on the air suction pipe of the compressor, and under the condition of low-temperature refrigeration, the electric heating device is controlled in real time according to the refrigerant state and the power fluctuation condition of the compressor, so that the air suction state of the compressor is changed, and the occurrence of liquid impact is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner device capable of preventing liquid impact by low-temperature refrigeration and a control method.
Background
In winter, under the condition of low ambient temperature, some iron towers, servers built in mountain areas and the like still need to use an air conditioner to dissipate heat, but under the condition of low-temperature refrigeration, liquid impact is easy to occur because the refrigerant is not completely evaporated in an evaporator, and the compressor is easy to stop and damage.
Disclosure of Invention
The invention aims to provide an air conditioner for preventing liquid impact by low-temperature refrigeration and a control method thereof, which can avoid the phenomenon of liquid impact of a compressor under the condition of low-temperature refrigeration.
According to one aspect of the present invention, there is provided an air conditioning apparatus for low temperature refrigeration to prevent liquid hammer, comprising an evaporator, a throttling device, a condenser, a compressor and an electric heating device;
the exhaust end of the compressor is connected with the first port of the condenser, the second port of the condenser is connected with the first port of the evaporator through the throttling device, and the second port of the evaporator is connected with the air suction end of the compressor through the electric heating device to form a refrigeration cycle loop.
In some embodiments, a four-way valve is also included;
the first valve port of the four-way valve is connected with the exhaust end of the compressor, the second valve port of the four-way valve is connected with the first port of the condenser, the third valve port of the four-way valve is connected with the second port of the evaporator, and the fourth valve port of the four-way valve is connected with the air suction end of the compressor through the electric heating device.
In some embodiments, a temperature sensor is arranged on a pipeline of the suction end of the compressor and is used for feeding back the suction temperature of the compressor in real time.
In some embodiments, a pressure sensor is arranged on a pipeline of the second port of the evaporator and is used for feeding back the evaporation pressure of the refrigerant in real time.
In some embodiments, the condenser has a bulb thereon for feeding back the outdoor ambient temperature.
In some embodiments, the evaporator is configured with an indoor fan.
In some embodiments, the condenser is configured with an outdoor fan.
According to another aspect of the present invention, there is provided a control method of the above-mentioned cryogenic refrigeration liquid impact prevention air conditioner, comprising the steps of:
when the air conditioner is in a refrigeration mode, acquiring an outdoor environment temperature Tw, if the outdoor environment temperature Tw is greater than a preset outdoor environment temperature, not starting the electric heating device, otherwise, entering the next step;
comparing the suction temperature T of the compressor with the saturated gas temperature T0 of the refrigerant under the evaporating pressure, if T is more than T0, the refrigerant is overheated gas, the electric heating device is not started, and if T is less than or equal to T0, the refrigerant is in a gas-liquid mixed state, and then entering the next step;
and (3) taking the time T which is less than or equal to T0 as zero time, starting to time the time T from the zero time, detecting the power change delta P of the compressor in the time T, if delta P is less than a preset value a, starting the electric heating device, setting time to zero, and judging the power change delta P of the compressor in the time T again until delta P is less than the preset value a, and stopping the electric heating device.
In some embodiments, the preset outdoor ambient temperature is 14 ℃.
In some embodiments, the preset value a is 20W.
By applying the technical scheme of the invention, the electric heating device is additionally arranged on the air suction pipeline of the compressor, and under the condition of low-temperature refrigeration, the electric heating device is controlled in real time according to the refrigerant state and the power fluctuation condition of the compressor, so that the air suction state of the compressor is changed, and the rapid abrasion of moving parts in the compressor caused by liquid impact is prevented, and the normal conveying of lubricating oil is influenced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
fig. 2 is a pressure enthalpy diagram of a single stage compression vapor refrigeration actual cycle;
fig. 3 is a detailed pressure enthalpy diagram of a single stage compression vapor refrigeration cycle;
fig. 4 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;
wherein:
1-an evaporator; 2-an indoor fan; 3 a throttling device; 4-a condenser; 5-an outdoor fan; 6-a pressure sensor; 7-a four-way valve; 8-a compressor; 9-an electric heating device; 10-temperature sensor.
Detailed Description
The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments, and it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In winter, under the condition of low ambient temperature, some iron towers, servers built in mountain areas and the like still need to use an air conditioner to dissipate heat, but under the condition of low-temperature refrigeration, liquid impact is easy to occur because the refrigerant is not completely evaporated in an evaporator, and the compressor is easy to stop and damage.
Therefore, the present application provides an air conditioner for preventing liquid impact by low temperature refrigeration and a control method thereof, so as to solve the problem of liquid impact caused by incomplete utilization of refrigerant in an evaporator under the low temperature condition, and the following is an exemplary description of the present application with reference to fig. 1 and 2.
As shown in fig. 1, an air conditioner for low-temperature refrigeration to prevent liquid impact comprises an evaporator 1, a throttling device 3, a condenser 4, a compressor 8 and an electric heating device 9, wherein the exhaust end of the compressor 8 is connected with a first port of the condenser 4, a second port of the condenser 4 is connected with the first port of the evaporator 1 through the throttling device 3, and the second port of the evaporator 1 is connected with the air suction end of the compressor 8 through the electric heating device 9 to form a refrigeration cycle.
By applying the technical scheme of the embodiment, the electric heating device 9 is additionally arranged on the air suction pipeline of the compressor 8, when the outdoor environment temperature is particularly low, the electric heating device 9 can be controlled in real time according to the refrigerant state and the power fluctuation condition of the compressor, the air suction state of the compressor 8 is changed, the occurrence of liquid impact is avoided, and further the rapid abrasion of moving parts inside the compressor 8 caused by the liquid impact is prevented, so that the normal conveying of lubricating oil is influenced.
As shown in fig. 1, the air conditioner of the present embodiment further includes an indoor fan 2, an outdoor fan 5, a pressure sensor 6, a four-way valve 7 and a temperature sensor 10, wherein a first valve port of the four-way valve 7 is connected with an exhaust end of the compressor 8, a second valve port is connected with a first port of the condenser 4, a third valve port is connected with a second port of the evaporator 1, a fourth valve port is connected with an intake end of the compressor 8 through an electric heating device 9, the indoor fan 2 is arranged in cooperation with the evaporator 1, the outdoor fan 5 is arranged in cooperation with the condenser 4, the pressure sensor 6 is arranged on a pipeline close to the second port of the evaporator 1 for feeding back an evaporation pressure P of a refrigerant in real time, the temperature sensor 10 is arranged on a pipeline close to the intake end of the compressor 8 for feeding back an intake temperature T of the compressor 8 in real time, and a bulb for feeding back an outdoor ambient temperature Tw in real time is arranged on the condenser 4.
The present embodiment also provides a control method of the air conditioner for preventing liquid impact during low-temperature refrigeration, and a specific control procedure is described below with reference to fig. 2 to 4.
Detecting outdoor environment temperature Tw and an operation mode, and continuously executing a second operation when Tw is less than or equal to 14 ℃ and is in a refrigeration mode; otherwise, the operation of the second step is not entered, and the electric heating device 9 is not operated.
The outdoor ambient temperature Tw can be obtained by a bulb on the condenser 4, and the refrigeration is low-temperature refrigeration under the condition of being generally less than 14 ℃, and only when the low-temperature refrigeration mode is entered, the liquid impact prevention control flow is entered, and the electric heating device 9 will have corresponding actions.
And secondly, comparing the suction temperature T of the compressor with the saturated gas temperature T0 of the refrigerant under the evaporating pressure (the saturated gas temperature T0 of the refrigerant under the current pressure is calculated through the evaporating pressure P), and judging the state of the refrigerant.
The suction temperature T of the compressor 8 can be obtained by the temperature sensor 10, and the evaporation pressure P can be obtained by the pressure sensor 6.
Specifically, as shown in fig. 2 and 3, the single-stage compression vapor refrigeration actual cycle is represented as 0-1-2-3-4-5-0 in the figures, wherein 0-1 represents the superheating process of vapor, 1-2 represents the actual entropy-increasing compression process, and 2-3 represents the refrigerant at the condensing pressure p k The isobaric cooling and condensing process under the condition that 3-4 represents the supercooling process of the coolant under the condensing pressure, 4-5 represents the throttling process of the coolant under the isenthalpic condition, and 5-0 represents the evaporating pressure p of the coolant 0 The following isobaric vaporization process.
When the suction temperature T of the compressor 8 is higher than the saturated gas temperature T0 of the refrigerant under the evaporation pressure, the refrigerant is overheated, and at the moment, the liquid impact risk is avoided, and the electric heating device 9 does not act; when the suction temperature T of the compressor 8 is less than or equal to the saturated gas temperature T0 of the refrigerant under the evaporating pressure, the refrigerant is in a gas-liquid mixed state, and there is a risk of liquid impact, and the third step of operation is performed.
And thirdly, with the time T less than or equal to T0 being judged as 0, starting to time T from the time T, detecting the power change delta P of the compressor 8 in the time T, if the power change delta P is less than a preset value a, no liquid impact risk exists, enabling the electric heating device 9, if the power change is more than or equal to the preset value a (the value a is about 20W and the systems with different sizes are slightly different), enabling the electric heating device 9, heating the refrigerant, and returning to the third step, setting 0 to time, judging the power change of the compressor 8 until the power change delta P is less than the preset value a, enabling the electric heating device 9 to stop working, and returning to continue the operation of the second step.
From the above description, it can be seen that, in the air conditioner for preventing liquid impact by low-temperature refrigeration of the present application, the electric heating device is additionally arranged on the air suction pipe of the compressor, and in the low-temperature refrigeration mode, according to the refrigerant state and the power fluctuation condition of the compressor, when the refrigerant is not evaporated completely in the evaporator, the electric heating device is controlled to heat the refrigerant, so as to change the air suction state of the compressor, and avoid the liquid impact of the compressor, thereby causing shutdown and damage to the compressor.
In the description of the present invention, it should be understood that the terms "center", "front, rear, upper, lower, left, right", "horizontal, vertical, horizontal", and "top, bottom", etc. generally refer to an orientation or a positional relationship based on that shown in the drawings, only for convenience of describing the present invention and simplifying the description, and that these orientation words do not indicate or imply that the apparatus or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. It will be understood by those of ordinary skill in the art that the specific meaning of the terms described above in this application
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An air conditioner for preventing liquid impact by low-temperature refrigeration, which is characterized in that: comprises an evaporator (1), a throttling device (3), a condenser (4), a compressor (8) and an electric heating device (9);
the exhaust end of the compressor (8) is connected with the first port of the condenser (4), the second port of the condenser (4) is connected with the first port of the evaporator (1) through the throttling device (3), and the second port of the evaporator (1) is connected with the air suction end of the compressor (8) through the electric heating device (9) to form a refrigeration cycle loop.
2. The cryogenically-cooled liquid impact-resistant air conditioning apparatus of claim 1 wherein: the four-way valve (7) is also included;
the first valve port of the four-way valve (7) is connected with the exhaust end of the compressor (8), the second valve port of the four-way valve (7) is connected with the first port of the condenser (4), the third valve port of the four-way valve (7) is connected with the second port of the evaporator (1), and the fourth valve port of the four-way valve (7) is connected with the air suction end of the compressor (8) through the electric heating device (9).
3. The cryogenically-cooled liquid impact-resistant air conditioning apparatus of claim 1 wherein: and a temperature sensor (10) is arranged on a pipeline at the air suction end of the compressor (8) and is used for feeding back the air suction temperature of the compressor (8) in real time.
4. The cryogenically-cooled liquid impact-resistant air conditioning apparatus of claim 1 wherein: and a pressure sensor (6) is arranged on a pipeline of the second port of the evaporator (1) and used for feeding back the evaporation pressure of the refrigerant in real time.
5. The cryogenically-cooled liquid impact-resistant air conditioning apparatus of claim 1 wherein: the condenser (4) is provided with a temperature sensing bag for feeding back the outdoor environment temperature.
6. The cryogenically-cooled liquid impact-resistant air conditioning apparatus of claim 1 wherein: the evaporator (1) is matched with an indoor fan (2).
7. The cryogenically-cooled liquid impact-resistant air conditioning apparatus of claim 1 wherein: the condenser (4) is matched with an outdoor fan (5).
8. A control method for an air conditioner for preventing liquid hammer applied to the low temperature refrigeration according to any one of claims 1 to 7, comprising the steps of:
when the air conditioner is in a refrigeration mode, acquiring an outdoor environment temperature Tw, if the outdoor environment temperature Tw is greater than a preset outdoor environment temperature, not starting the electric heating device, otherwise, entering the next step;
comparing the suction temperature T of the compressor with the saturated gas temperature T0 of the refrigerant under the evaporating pressure, if T is more than T0, the refrigerant is overheated gas, the electric heating device is not started, and if T is less than or equal to T0, the refrigerant is in a gas-liquid mixed state, and then entering the next step;
and (3) taking the time T which is less than or equal to T0 as zero time, starting to time the time T from the zero time, detecting the power change delta P of the compressor in the time T, if delta P is less than a preset value a, starting the electric heating device, setting time to zero, and judging the power change delta P of the compressor in the time T again until delta P is less than the preset value a, and stopping the electric heating device.
9. The control method according to claim 8, characterized in that: the preset outdoor environment temperature is 14 ℃.
10. The control method according to claim 8, characterized in that: the preset value a is 20W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211641804.0A CN116086035A (en) | 2022-12-20 | 2022-12-20 | Air conditioner capable of preventing liquid impact by low-temperature refrigeration and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211641804.0A CN116086035A (en) | 2022-12-20 | 2022-12-20 | Air conditioner capable of preventing liquid impact by low-temperature refrigeration and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116086035A true CN116086035A (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211641804.0A Pending CN116086035A (en) | 2022-12-20 | 2022-12-20 | Air conditioner capable of preventing liquid impact by low-temperature refrigeration and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116086035A (en) |
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2022
- 2022-12-20 CN CN202211641804.0A patent/CN116086035A/en active Pending
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