CN113970205B - Liquid-impact-prevention control system of liquid storage tank - Google Patents
Liquid-impact-prevention control system of liquid storage tank Download PDFInfo
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- CN113970205B CN113970205B CN202111258192.2A CN202111258192A CN113970205B CN 113970205 B CN113970205 B CN 113970205B CN 202111258192 A CN202111258192 A CN 202111258192A CN 113970205 B CN113970205 B CN 113970205B
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- 239000007788 liquid Substances 0.000 title claims abstract description 189
- 230000002265 prevention Effects 0.000 claims abstract description 39
- 230000003068 static effect Effects 0.000 claims description 20
- 239000003507 refrigerant Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004880 explosion Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009491 slugging Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
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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
- 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
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- 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)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a liquid impact prevention control system of a liquid storage tank, wherein the control system comprises preset liquid impact prevention logic parameters; judging whether the compressor has liquid impact or not according to the liquid impact prevention logic parameter; if so, adjusting the liquid level height of the liquid storage tank by controlling the opening of the electronic expansion valve and the frequency of the compressor until the liquid level height in the liquid storage tank meets the liquid impact prevention logic parameter; and if not, executing the opening of the electronic expansion valve and the frequency of the compressor according to the original setting mode. The invention adjusts the liquid level height in the liquid storage tank by effectively sensing, identifying and judging the liquid level height of the liquid storage tank, thereby avoiding the damage of liquid impact and even explosion of the compressor and improving the service life and the safety of the compressor.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a liquid impact prevention control system of a liquid storage tank.
Background
The main method for preventing the compressor from liquid impact in the current air conditioning system mainly adopts a liquid storage tank (gas-liquid separator) method to separate the refrigerant, but this causes the cost to be high. Meanwhile, the heat exchange of the evaporator is reduced along with the fact that the whole heat exchange system is smaller and smaller, the superheat degree of a refrigerant entering the compressor is reduced, and the liquid level of the liquid storage tank of the compressor is constantly increased.
However, this further increases the risk of compressor slugging. Moreover, the compressor cylinder body sucks air and carries liquid, so that liquid impact is caused, the service life and reliability of the compressor are seriously influenced, even the air cylinder is damaged to cause the damage of compressor explosion and the like, and the liquid impact can cause overlarge current of the compressor to burn an insulating layer of a motor slot line, so that the liquid impact prevention is very important for an air conditioning system.
Disclosure of Invention
In order to overcome the above-mentioned disadvantages of the prior art, it is an object of the present invention to provide a liquid impact prevention control system for a liquid storage tank, which solves the above-mentioned problems.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a liquid impact prevention control system of a liquid storage tank is disclosed, wherein the control system comprises preset liquid impact prevention logic parameters;
judging whether the compressor has liquid impact or not according to the liquid impact prevention logic parameter;
if so, adjusting the liquid level height of the liquid storage tank by controlling the opening of an electronic expansion valve and the frequency of a compressor until the liquid level height in the liquid storage tank meets the liquid impact prevention logic parameter;
and if not, executing the opening of the electronic expansion valve and the frequency of the compressor according to the original setting mode.
As a further improvement of the invention: the liquid impact prevention logic parameter is P = P Suction device P is the current detected pressure, and ptyption is the suction pressure of the compressor.
As a further improvement of the invention: the detected pressure P = ρ gh + P 0 ρ gh is the pressure of the liquid refrigerant, P 0 The pressure of the gaseous refrigerant above the liquid level.
As a further improvement of the invention: the detection pressure is sensed by a static pressure type liquid level sensor, and the static pressure type liquid level sensor is arranged in the liquid storage tank.
As a further improvement of the invention: the step of judging whether the compressor has liquid impact through the liquid impact prevention logic parameter comprises the following steps:
sensing the current detection pressure P through a static pressure type liquid level sensor;
judging the detection pressure P;
if the detected pressure P is in accordance with P = P 0 =P Suction device If so, the compressor has no liquid impact;
if the detected pressure P is in accordance with P > P 0 =P Suction device Then there is a liquid slugging of the compressor.
As a further improvement of the invention: frequency of the compressorIncluding a reduced speed frequency F and a reduced opening speed P s (ii) a After the compressor is judged to have liquid impact, the control step of adjusting the liquid level height of the liquid storage tank by controlling the opening of the electronic expansion valve and the frequency of the compressor comprises the following steps:
the compressor decreases the opening speed P according to the decreasing speed frequency F and the compressor frequency s To adjust the level of the liquid reservoir.
As a further improvement of the invention: the speed reduction frequency F is 2HZ/s, and the opening degree reduction speed P s Is 20P/s.
A liquid impact prevention control device of a liquid storage tank comprises the liquid storage tank and a compressor; the liquid storage tank is connected with a compressor, and a static pressure type liquid level sensor and an air suction pipe are arranged in the compressor; wherein, the device comprises the liquid impact prevention control system of the liquid storage tank.
An air conditioner comprises the liquid impact prevention control device of the liquid storage tank.
Compared with the prior art, the invention has the beneficial effects that:
through discerning and judging the effective response of liquid storage pot liquid level height, adjust the liquid level height in the liquid storage pot to avoid the compressor to take place the liquid and hit, even the harm that explodes, improved the life and the security of compressor.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a diagram showing the compressor of the present invention without liquid hammering.
Fig. 3 is a diagram illustrating a liquid impact condition of the compressor according to the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying description and examples:
the invention provides a liquid impact prevention control system of a liquid storage tank as shown in the attached figures 1-3, wherein the control system comprises preset liquid impact prevention logic parameters;
judging whether the compressor 2 has liquid impact or not through the liquid impact prevention logic parameter;
if so, adjusting the liquid level height of the liquid storage tank 1 by controlling the opening of the electronic expansion valve and the frequency of the compressor until the liquid level height in the liquid storage tank 1 meets the liquid impact prevention logic parameter;
and if not, executing the opening of the electronic expansion valve and the frequency of the compressor according to the original setting mode.
Through the control system, when the amount of refrigerant poured into the air conditioning system is too much and the capacity of the liquid storage tank 1 cannot be adjusted, the system can timely judge and identify that the liquid level of the liquid storage tank 1 is too high, and timely control is carried out on the liquid level through control system parameters.
According to the attached figure 1, the liquid impact prevention logic parameter is P = P Suction device P is the current detected pressure, and pcorption is the suction pressure of the compressor 2.
The core principle of the control system is a pressure identification control system, the liquid impact prevention logic parameters are obtained according to the sensing principle of the static pressure type liquid level sensor 3, namely the static pressure type liquid level sensor 3 is arranged on the inner wall of the liquid storage tank 1 and is in contact with and can sense the pressure, namely the detected pressure P = rho gh + P 0 ρ gh is the pressure of the liquid refrigerant, P 0 The pressure of the gaseous refrigerant above the liquid level. When the liquid level is higher than the set height of the static pressure type liquid level sensor 3, the static pressure type liquid level sensor 3 can immediately sense the current pressure rho gh of the liquid refrigerant and the pressure P of the gas refrigerant above the liquid level 0 Therefore, at this time P = ρ gh + P 0 (ii) a When the liquid level is lower than the static pressure type liquid level sensor 3, the static pressure type liquid level sensor 3 is not contacted with the liquid refrigerant, and can only sense the pressure P of the gaseous refrigerant 0 Thus, this time P = P 0 . According to the principle, the liquid level height is identified in a sectional mode, and the opening degree and the frequency of the compressor 2 are synchronously controlled to adjust the liquid level.
Therefore, according to the present invention, as shown in fig. 1, the detection pressure is sensed by a static pressure type liquid level sensor 3, and the static pressure type liquid level sensor 3 is disposed in the liquid storage tank 1.
According to the principle, the method for judging whether the liquid impact exists or not according to the invention is shown in the attached figure 1, and the step of judging whether the liquid impact exists or not by the compressor 2 through the liquid impact prevention logic parameter comprises the following steps:
sensing the current detection pressure P through a static pressure type liquid level sensor 3;
judging the detection pressure P;
if the detected pressure P is in accordance with P = P 0 =P Suction device There is no liquid impact on the compressor 2;
if the detected pressure P is in accordance with P > P 0 =P Suction device There is a liquid slugging of the compressor 2.
In order to further control the regulation of the hydraulic pressure according to the invention accurately and improve the safety of the regulation, according to the diagram of fig. 1, the compressor frequency comprises a speed reduction frequency F and a speed reduction opening P s (ii) a After the compressor 2 is judged to have liquid impact, the control step of regulating the liquid level height of the liquid storage tank 1 by controlling the opening of the electronic expansion valve and the frequency of the compressor comprises the following steps:
the compressor 2 decreases the opening speed P at the compressor frequency according to the decreasing speed frequency F s To adjust the level of the liquid reservoir 1.
In one embodiment of the invention, the deceleration frequency F is 2HZ/s, and the opening speed P is reduced s Is 20P/s.
The control system of the invention has the working procedures that:
(1) When the refrigerant is in the liquid storage tank 1, as shown in fig. 2, the liquid level does not rise to the position of the static pressure type liquid level sensor 3, the pressure sensor is above the liquid level, and the detected pressure P = P 0 =P Suction device That is, the suction pressure of the compressor 2 is equal to the detection pressure sensed by the static pressure type liquid level sensor 3, and at the moment, the height of the refrigerant in the liquid storage tank 1 is within a safety range, so that the liquid impact hidden danger of the compressor 2 is small. Therefore, the compressor frequency and the electronic expansion valve opening degree are performed according to the normal logic of the air conditioner.
(2) When the liquid level rises above the liquid level sensor, the liquid level sensor enters the control system provided by the invention, and the static pressure type liquid level sensor 3 senses the pressure rho gh of the liquid refrigerant in the liquid storage tank 1 and the pressure P of the gaseous refrigerant 0 As shown in fig. 3, the detection pressure P = ρ gh + P 0 ＞P 0 =P Suction device Therefore, the opening of the electronic expansion valve and the frequency of the compressor enter into the regulation and control link for preventing liquid impact, as shown in the attached figure 3, the control method is as follows: the frequency of the compressor is decreased by the opening speed P at the frequency decreasing speed F =2HZ/s s Adjustment is carried out at 20P/s, i.e. the compressor frequency is adjusted at a rate of 2HZ down per second, the opening degree is decreased by 20P per second.
(3) After the compressor frequency is adjusted at a rate of 2HZ per second of frequency reduction and at a rate of 20P opening per second of opening degree reduction, the liquid level of the liquid storage tank 1 is reduced accordingly. When the liquid level of the liquid storage tank 1 falls below the pressure reduction type liquid level sensor, the detected pressure P = P 0 =P Suction device Namely, the liquid impact condition is not met, so that the liquid impact prevention logic control is exited, and the compressor frequency and the opening degree of the electronic expansion valve are executed according to the normal logic of the air conditioner.
In one embodiment of the present invention, as shown in fig. 2, the present invention comprises a liquid-impact prevention control device for a liquid storage tank, which comprises a liquid storage tank 1 and a compressor 2; the liquid storage tank 1 is connected with the compressor 2, and the static pressure type liquid level sensor 3 and the air suction pipe 4 are arranged in the compressor 2; wherein, the device comprises the liquid impact prevention control system of the liquid storage tank.
In another embodiment of the invention, the invention comprises an air conditioner, wherein the liquid impact prevention control device of the liquid storage tank is included.
The main functions of the invention are as follows: the device is applied to various air conditioners and is used for preventing the liquid impact of the compressor.
In summary, after reading the present disclosure, those skilled in the art can make various other corresponding changes without creative mental work according to the technical solutions and concepts of the present disclosure, and all of them are within the protection scope of the present disclosure.
Claims (6)
1. The liquid impact prevention control system of the liquid storage tank is characterized by comprising preset liquid impact prevention logic parameters;
judging whether the compressor has liquid impact or not according to the liquid impact prevention logic parameter;
the step of judging whether the liquid impact exists in the compressor through the liquid impact prevention logic parameter comprises the following steps:
sensing the current detection pressure P through a static pressure type liquid level sensor;
judging the detection pressure P;
if the detected pressure P is in accordance with P = P 0 =P Suction device There is no liquid impact on the compressor, where P is the current detected pressure, and P is Suction device Is the suction pressure of the compressor, P 0 The pressure of the gaseous refrigerant above the liquid level;
if the detected pressure P is in accordance with P > P 0 =P Suction device If so, the compressor has liquid impact;
if so, adjusting the liquid level height of the liquid storage tank by controlling the opening of the electronic expansion valve and the frequency of the compressor until the liquid level height in the liquid storage tank meets the liquid impact prevention logic parameter;
when the liquid level of the liquid storage tank drops below the pressure reduction type liquid level sensor, the detected pressure P = P 0 =P Suction device Namely, the liquid impact condition is not met, so that the liquid impact prevention logic control is quitted, and the frequency of the compressor and the opening degree of the electronic expansion valve are executed according to the normal logic of the air conditioner;
if not, executing the opening of the electronic expansion valve and the frequency of the compressor according to the original setting mode;
the detection pressure is sensed by a static pressure type liquid level sensor which is arranged in the liquid storage tank;
the compressor frequency includes a reduced speed frequency F and a reduced opening speed P s (ii) a After the compressor is judged to have liquid impact, the control step of regulating the liquid level height of the liquid storage tank by controlling the opening of the electronic expansion valve and the frequency of the compressor comprises the following steps:
the compressor decreases the opening speed P according to the decreasing speed frequency F and the compressor frequency s To adjust the level of the liquid reservoir.
2. The liquid impact prevention control system of a liquid storage tank as set forth in claim 1, wherein the liquid impact prevention logic parameter is P = P Suction device 。
3. The liquid impact prevention control system for a liquid storage tank as set forth in claim 2, wherein said detected pressure P = ρ gh + P 0 ρ gh is the pressure of the liquid refrigerant.
4. The liquid impact prevention control system for a liquid storage tank as set forth in claim 1, wherein said deceleration frequency F is 2HZ/s and said reduction opening speed P s Is 20P/s.
5. An anti-liquid-impact control device of a liquid storage tank, comprising the liquid storage tank and a compressor, wherein the liquid storage tank is connected with the compressor, and a static pressure type liquid level sensor and an air suction pipe are arranged in the compressor, characterized in that the device comprises the anti-liquid-impact control system of the liquid storage tank according to any one of claims 1 to 4.
6. An air conditioner characterized by comprising the liquid tank impact prevention control device of the liquid tank as claimed in claim 5.
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| CN202111258192.2A CN113970205B (en) | 2021-10-27 | 2021-10-27 | Liquid-impact-prevention control system of liquid storage tank |
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| CN202111258192.2A CN113970205B (en) | 2021-10-27 | 2021-10-27 | Liquid-impact-prevention control system of liquid storage tank |
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| CN113970205B true CN113970205B (en) | 2023-03-14 |
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| CN115031435A (en) * | 2022-05-17 | 2022-09-09 | 珠海格力电器股份有限公司 | Compressor assembly, air conditioner and control method |
| CN115264975B (en) * | 2022-08-11 | 2023-10-03 | 国联江森自控绿色科技(无锡)有限公司 | Hybrid refrigeration system and method |
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