CN113970205A - 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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- CN113970205A CN113970205A CN202111258192.2A CN202111258192A CN113970205A CN 113970205 A CN113970205 A CN 113970205A CN 202111258192 A CN202111258192 A CN 202111258192A CN 113970205 A CN113970205 A CN 113970205A
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- liquid
- compressor
- storage tank
- liquid storage
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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 problems 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 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.
As a further improvement of the invention: the liquid impact prevention logic parameter is P ═ PSuction deviceP is the current detected pressure, and ptyption is the suction pressure of the compressor.
As a further improvement of the invention: the detection pressure P is rho gh + P0ρ gh is the pressure of the liquid refrigerant, P0The 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 matched with P ═ P0＝PSuction deviceIf so, the compressor has no liquid impact;
if the detected pressure P is in accordance with P > P0＝PSuction deviceThen there is a liquid impact on the compressor.
As a further improvement of the invention: the compressor frequency includes a reduced speed frequency F and a reduced opening speed Ps(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:
compressor operating at compressor frequency with reduced speed frequency F and reduced opening speed PsTo 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 PsIs 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 the effective response discernment and the judgement to 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 ═ PSuction deviceP 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 contacted with and can sense the pressure, namely the detected pressure P is rho gh + P0ρ gh is the pressure of the liquid refrigerant, P0The pressure of the gaseous refrigerant above the liquid level. When the liquid level is higher than the setting height of the static pressure type liquid level sensor 3, the liquid level is staticThe 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 level0Therefore, at this time, P is ρ gh + P0(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 refrigerant0Thus, when P ═ P0. 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 detected pressure is sensed by a static pressure type level sensor 3, and the static pressure type 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 matched with P ═ P0＝PSuction deviceThere is no liquid impact on the compressor 2;
if the detected pressure P is in accordance with P > P0＝PSuction deviceThen there is a liquid impact on the compressor 2.
In order to further control the regulation of the hydraulic pressure according to the invention with precision and improve the safety of the regulation, the compressor frequency comprises a reduced speed frequency F and a reduced opening speed P, as shown in fig. 1s(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 FsTo adjust the level of the liquid reservoir 1.
In one embodiment of the invention, the speed reduction frequency F is 2HZ/s, and the opening speed P is reducedsIs 20P/s.
The control system of the invention has the working procedures that:
(1) when the refrigerant is in the position of the liquid storage tank 1 as shown in figure 2, the liquid level does not rise to the position of the static pressure type liquid level sensor 3, the pressure sensor is positioned above the liquid level, and the detected pressure P is equal to P0＝PSuction deviceThat 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 refrigerant0As shown in fig. 3, the detected pressure P is ρ gh + P0＞P0＝PSuction deviceTherefore, 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 compressor is decreased by decreasing opening speed P according to the frequency-reducing speed F being 2HZ/ssThe compressor frequency is adjusted at 20P/s, i.e. the compressor frequency is decreased by 2HZ per second and the opening 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 drops below the pressure reduction type liquid level sensor, the detected pressure P is equal to P0＝PSuction deviceNamely, the liquid impact condition is not satisfied, 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 invention, as shown in figure 2, the invention comprises a liquid-impact-preventing control device of a liquid storage tank, which comprises a liquid storage tank 1 and a compressor 2; the liquid storage tank 1 is connected with a compressor 2, and a static pressure type liquid level sensor 3 and an 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 labor 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 (9)
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;
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.
2. The fluid reservoir tank fluid impact prevention control system as defined in claim 1, wherein the fluid impact prevention logic parameter is P ═ PSuction deviceP is the current detected pressure, PSuction deviceIs the suction pressure of the compressor.
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 + P0ρ gh is the pressure of the liquid refrigerant, P0The pressure of the gaseous refrigerant above the liquid level.
4. The anti-hydraulic shock control system for a fluid reservoir of claim 2, wherein said sensed pressure is sensed by a static pressure type level sensor disposed within said fluid reservoir.
5. The system as claimed in claim 1, wherein the step of determining whether there is liquid impact on the compressor according to the liquid impact prevention logic parameter comprises:
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 matched with P ═ P0＝PSuction deviceIf so, the compressor has no liquid impact;
if the detected pressure P is in accordance with P > P0＝PSuction deviceThen there is a liquid impact on the compressor.
6. The anti-hydraulic-shock control system for a fluid reservoir of claim 1, wherein the compressor frequency includes a reduced speed frequency F and a reduced opening speed Ps(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:
compressor operating at compressor frequency with reduced speed frequency F and reduced opening speed PsTo adjust the level of the liquid reservoir.
7. The liquid impact prevention control system for a liquid storage tank as set forth in claim 6, wherein said deceleration frequency F is 2HZ/s and said reduction opening speed PsIs 20P/s.
8. 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; characterized in that said device comprises an anti-liquid-hammer control system of a liquid storage tank according to any one of claims 1 to 7.
9. An air conditioner characterized by comprising the liquid tank impact prevention control device of the liquid tank as claimed in claim 8.
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| Application Number | Priority Date | Filing Date | Title |
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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 CN113970205B (en) | 2023-03-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115264975A (en) * | 2022-08-11 | 2022-11-01 | 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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| 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 |
| CN115264975A (en) * | 2022-08-11 | 2022-11-01 | 国联江森自控绿色科技(无锡)有限公司 | Hybrid refrigeration system and 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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| Publication number | Publication date |
|---|---|
| CN113970205B (en) | 2023-03-14 |
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