CN112431759A - Compressor with high adjustment precision, control method thereof and air conditioning system - Google Patents
Compressor with high adjustment precision, control method thereof and air conditioning system Download PDFInfo
- Publication number
- CN112431759A CN112431759A CN202011356290.5A CN202011356290A CN112431759A CN 112431759 A CN112431759 A CN 112431759A CN 202011356290 A CN202011356290 A CN 202011356290A CN 112431759 A CN112431759 A CN 112431759A
- Authority
- CN
- China
- Prior art keywords
- slide valve
- compressor
- pressure
- rotor pair
- accommodating cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
- F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention provides a compressor with high adjustment precision, a control method thereof and an air conditioning system. The compressor comprises a rotor pair, a slide valve, an accommodating cavity and a pressure guide channel, wherein the slide valve is provided with the accommodating cavity and the pressure guide channel, exhaust of the rotor pair enters the accommodating cavity through the pressure guide channel, and a pressure detection mechanism is arranged in the accommodating cavity. The invention provides a compressor with high regulation precision, a control method thereof and an air conditioning system.A pressure detection mechanism is arranged on a slide valve, and exhaust of a rotor pair is led to the pressure detection mechanism by using a pressure leading channel for pressure detection, so that the exhaust pressure of the compressor is directly obtained and is compared and judged with the condensation pressure in a refrigerant heat exchange cycle where the compressor is located, the slide valve is regulated to the optimal position, meanwhile, the end part of the slide valve is always protruded out of the air suction end surface of the rotor pair, the rotor pair is prevented from being communicated at the air suction end surface due to the movement of the slide valve, the fluid loss is effectively reduced, and the efficiency of the compressor and the reliability of the compressor are improved.
Description
Technical Field
The invention relates to the technical field of compression equipment, in particular to a compressor with high adjustment precision, a control method of the compressor and an air conditioning system.
Background
Due to the fact that the cold consumption and the ambient temperature change constantly, the evaporation temperature and the condensation temperature and the corresponding saturation pressure of the refrigeration system in the operation process change accordingly, and therefore the refrigeration compressor faces the pressure change before an air inlet and after an air outlet constantly in the system; meanwhile, for the screw compressor, when the exhaust pressure of the compressor is lower than the condensation pressure after the exhaust port, the screw rotor is required to do extra work to forcibly extrude the gas inside the rotor, so that the efficiency of the compressor is reduced. Therefore, the screw compressor needs to adjust the internal pressure ratio/internal volume ratio, and in the process of constantly changing the evaporation pressure (namely the suction pressure) and the condensation pressure, the exhaust pressure is ensured to be always close to the condensation pressure as much as possible, so as to realize the high-efficiency operation of the equipment under different working conditions.
Disclosure of Invention
In order to solve the technical problem that the adjustment precision is poor due to the fact that a displacement sensor is used for recording and adjusting the position of a slide valve in the compressor in the prior art, the compressor with high adjustment precision is provided, wherein a pressure detection mechanism is arranged inside the slide valve, exhaust of a rotor pair is detected, and the slide valve is controlled to move according to a comparison result of a detection result and a condensation pressure.
A compressor, comprising:
a pair of rotors;
a slide valve provided on the pair of rotors and capable of sliding freely relative to the pair of rotors;
the slide valve is provided with an accommodating cavity and a pressure guide channel, and exhaust gas of the rotor pair enters the accommodating cavity through the pressure guide channel;
and the pressure detection mechanism is arranged in the accommodating cavity.
The slide valve is provided with a first side surface which is attached to the rotor pair, the inlet of the pressure guide channel is positioned on the first side surface, and the outlet of the pressure guide channel is communicated with the accommodating cavity.
The rotor pair has a suction end and a discharge end, and the length of the slide valve protruding from the suction end is greater than or equal to the sliding distance of the slide valve on the rotor pair.
The compressor also comprises a slide valve driving mechanism which drives the slide valve to freely slide relative to the rotor pair.
The slide valve driving mechanism comprises a pressure cavity, a piston and a connecting rod, wherein the piston is arranged in the pressure cavity, a first end of the connecting rod is arranged on the piston, a second end of the connecting rod is arranged on the slide valve, and the piston can freely move in the pressure cavity.
The pair of rotors has a suction end and a discharge end, and the slide valve driving mechanism further includes a return mechanism that is provided between the piston and the slide valve and has a tendency to move the slide valve from the suction end to the discharge end.
A method of controlling the compressor described above, the pair of rotors having a suction end and a discharge end, the method comprising:
acquiring a value P1 of a pressure detection mechanism and a condensing pressure P2 in a refrigerant heat exchange cycle where the compressor is located, and calculating a delta P which is P1-P2;
setting a first pressure difference P0, comparing Δ P to P0 and-P0;
if DeltaP is more than P0, the slide valve is moved to the air suction end;
if-P0 <. DELTA.P < P0, the position of the spool valve is held constant;
if DeltaP < -P0, the slide valve is moved to the exhaust end.
The first pressure difference P0 has a value in the range of 3kpa to 10 kpa.
An air conditioning system comprises the compressor.
The invention provides a compressor with high regulation precision, a control method thereof and an air conditioning system.A pressure detection mechanism is arranged on a slide valve, and exhaust of a rotor pair is led to the pressure detection mechanism by using a pressure leading channel for pressure detection, so that the exhaust pressure of the compressor is directly obtained and is compared and judged with the condensation pressure in a refrigerant heat exchange cycle where the compressor is located, the slide valve is regulated to the optimal position, meanwhile, the end part of the slide valve is always protruded out of the air suction end surface of the rotor pair, the rotor pair is prevented from being communicated at the air suction end surface due to the movement of the slide valve, the fluid loss is effectively reduced, and the efficiency of the compressor and the reliability of the compressor are improved.
Drawings
Fig. 1 is a schematic structural diagram of a compressor with high adjustment precision, a control method thereof and an embodiment of an air conditioning system provided by the invention;
FIG. 2 is a schematic structural diagram of a slide valve of an embodiment of a compressor with high regulation precision, a control method thereof and an air conditioning system provided by the invention;
in the figure:
1. a pair of rotors; 2. a spool valve; 21. a pressure introduction channel; 3. a pressure detection mechanism; 4. a slide valve drive mechanism; 11. and a suction end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The compressor shown in fig. 1 and 2 comprises a rotor pair 1, comprising a male rotor and a female rotor which are meshed with each other, wherein the male rotor and the female rotor are relatively rotated so as to extrude fluid from a suction end to a discharge end of the rotor pair 1, thereby realizing the purpose of fluid pressurization; the slide valve 2 is arranged on the rotor pair 1 and can freely slide relative to the rotor pair 1, and the sliding of the slide valve 2 adjusts the exhaust position of the rotor pair 1, so that the effective compression length of the rotor pair 1 is adjusted, and the adjustment of the exhaust pressure of the rotor pair 1 (the exhaust pressure of the compressor), namely the adjustment of the internal volume ratio of the compressor is achieved; the slide valve 2 is provided with an accommodating cavity and a pressure guide channel 21, exhaust gas of the rotor pair 1 enters the accommodating cavity through the pressure guide channel 21, the pressure detection mechanism 3 is arranged in the accommodating cavity, part of the pressure guide channel 21 forms the accommodating cavity, an accommodating groove with an opening can be arranged on the slide valve 2 to form the accommodating cavity, and a sealing cover is arranged at the opening, so that the pressure detection mechanism 3 can be mounted in the slide valve 2, the reliability of the structures of the slide valve 2 and the pressure detection mechanism 3 is ensured, the pressure guide channel 21 is arranged on the slide valve 2, pressure fluid can be selected to be obtained in a tooth groove where the rotor pair 1 is to exhaust along with the movement of the slide valve 2, and the pressure detection mechanism 3 can be ensured to increase the precision of the position adjustment of the slide valve by detecting the numerical value of the exhaust gas pressure of the rotor pair 1.
The slide valve 2 has a first side surface attached to the rotor pair 1, an inlet of the pressure guide channel 21 is located on the first side surface, and an outlet of the pressure guide channel 21 is communicated with the accommodating cavity, that is, the pressure guide channel 21 can directly obtain pressure fluid at a position where the slide valve 2 is matched with the rotor pair 1, so as to ensure accuracy of exhaust pressure corresponding to the pressure fluid obtained by the pressure guide channel 21, preferably, the inlet of the pressure guide channel 21 is arranged on an end portion of the slide valve close to an exhaust end of the rotor pair, and the pressure detection mechanism 3 is arranged at the outlet of the pressure guide channel 21.
The rotor pair 1 is provided with a suction end and a discharge end, the length of the slide valve 2 protruding out of the suction end is greater than or equal to the sliding distance of the slide valve 2 on the rotor pair 1, so that the end part of the slide valve 2 is always positioned on the side of the suction end far away from the discharge end no matter the slide valve 2 is positioned at any position (including the slide valve 2 is positioned at the limit position), and the problem of fluid loss caused by bypass generated at the suction end cover of the rotor pair 1 due to the movement of the slide valve 2 is avoided.
The compressor further comprises a slide valve driving mechanism 4, the slide valve driving mechanism 4 drives the slide valve 2 to freely slide relative to the rotor pair 1, and the slide valve driving mechanism 4 controls the position of the slide valve 2 according to a comparison result of detection data of the pressure detection mechanism 3 and condensation pressure in a refrigerant heat exchange cycle where the compressor is located.
The slide valve driving mechanism 4 includes a pressure chamber, a piston provided in the pressure chamber, and a connecting rod having a first end provided on the piston and a second end provided on the slide valve 2 and being freely movable in the pressure chamber, and injects a pressure fluid into the pressure chamber to drive the piston to move, and transmits the movement to the slide valve 2 through the connecting rod, thereby controlling the movement of the slide valve 2.
The rotor pair 1 has an air suction end 11 and an air discharge end, the slide valve driving mechanism 4 further includes a reset mechanism, the reset mechanism is arranged between the piston and the slide valve 2, the reset mechanism has a tendency that the slide valve 2 moves from the air suction end 11 to the air discharge end, when the slide valve 2 moves to the air suction end 11, the reset mechanism is extruded to accumulate energy, when the slide valve 2 needs to move to the air discharge end, the pressure cavity is decompressed, the reset mechanism releases energy, the piston is extruded to the deep part of the pressure cavity, and the reset movement of the slide valve 2 is completed.
A control method of the compressor, wherein the rotor pair 1 has a suction end 11 and a discharge end, the control method comprising:
acquiring a value P1 of a pressure detection mechanism 3 and a condensing pressure P2 in a refrigerant heat exchange cycle where the compressor is located, and calculating a delta P which is P1-P2;
setting a first pressure difference P0, comparing Δ P to P0 and-P0;
if delta P is more than P0, the compressor is in an over-compression state at the moment, and a certain degree of unloading is needed, the slide valve 2 is moved to the air suction end 11, so that the effective compression length of the rotor pair 1 is reduced, the exhaust pressure P1 of the rotor pair 1 is reduced, and the delta P is repeatedly calculated;
if-P0 <. DELTA.P < P0, the position of the slide valve 2 is kept unchanged, indicating that the compressor is in a normal compression state at the moment, and the slide valve 2 does not need to be moved;
if DeltaP < -P0 shows that the compressor is in an under-compression state at this time, and the loading of the moving degree is required, the slide valve 2 is moved to the exhaust end, so that the effective compression length of the rotor pair 1 is increased, the exhaust pressure P1 of the rotor pair 1 is increased, and the computation of DeltaP is repeated.
The first pressure difference P0 has a value in the range of 3kpa to 10kpa, preferably 5 kpa.
An air conditioning system comprises the compressor.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A compressor, characterized by: the method comprises the following steps:
a rotor pair (1);
a slide valve (2) which is provided on the pair of rotors (1) and is capable of sliding freely relative to the pair of rotors (1);
an accommodating cavity and a pressure guide channel (21) are arranged on the slide valve (2), and exhaust gas of the rotor pair (1) enters the accommodating cavity through the pressure guide channel (21);
and the pressure detection mechanism (3) is arranged in the accommodating cavity.
2. The compressor of claim 1, wherein: the slide valve (2) is provided with a first side face attached to the rotor pair (1), the inlet of the pressure guide channel (21) is located on the first side face, and the outlet of the pressure guide channel (21) is communicated with the accommodating cavity.
3. The compressor of claim 1, wherein: the rotor pair (1) is provided with a suction end (11) and a discharge end, and the length of the slide valve (2) protruding out of the suction end (11) is larger than or equal to the sliding distance of the slide valve (2) on the rotor pair (1).
4. The compressor of claim 1, wherein: the compressor also comprises a slide valve driving mechanism (4), and the slide valve driving mechanism (4) drives the slide valve (2) to freely slide relative to the rotor pair (1).
5. The compressor of claim 4, wherein: the slide valve driving mechanism (4) comprises a pressure cavity, a piston and a connecting rod, wherein the piston is arranged in the pressure cavity, a first end of the connecting rod is arranged on the piston, a second end of the connecting rod is arranged on the slide valve (2), and the piston can freely move in the pressure cavity.
6. The compressor of claim 5, wherein: the rotor pair (1) is provided with a suction end (11) and a discharge end, the slide valve driving mechanism (4) further comprises a reset mechanism, the reset mechanism is arranged between the piston and the slide valve (2), and the reset mechanism has the tendency that the slide valve (2) moves from the suction end (11) to the discharge end.
7. A control method of a compressor according to any one of claims 1 to 6, characterized in that: the rotor pair (1) has a suction end (11) and a discharge end, and the control method comprises the following steps:
acquiring a value P1 of a pressure detection mechanism (3) and a condensing pressure P2 in a refrigerant heat exchange cycle where the compressor is located, and calculating delta P as P1-P2;
setting a first pressure difference P0, comparing Δ P to P0 and-P0;
if DeltaP is larger than P0, the slide valve (2) is moved to the air suction end (11);
if-P0 <. DELTA.P < P0, the position of the slide valve (2) is kept unchanged;
if DeltaP < -P0, the slide valve (2) is moved to the exhaust end.
8. The control method according to claim 7, characterized in that: the first pressure difference P0 has a value in the range of 3kpa to 10 kpa.
9. An air conditioning system characterized by: comprising a compressor according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011356290.5A CN112431759A (en) | 2020-11-26 | 2020-11-26 | Compressor with high adjustment precision, control method thereof and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011356290.5A CN112431759A (en) | 2020-11-26 | 2020-11-26 | Compressor with high adjustment precision, control method thereof and air conditioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112431759A true CN112431759A (en) | 2021-03-02 |
Family
ID=74698521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011356290.5A Pending CN112431759A (en) | 2020-11-26 | 2020-11-26 | Compressor with high adjustment precision, control method thereof and air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112431759A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114847064A (en) * | 2022-05-26 | 2022-08-05 | 安徽科技学院 | Positioning system is put in noctuid black oophagous wasp field |
| WO2023155448A1 (en) * | 2022-02-15 | 2023-08-24 | 珠海格力电器股份有限公司 | Screw compressor and control method thereof, and air conditioning device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4457681A (en) * | 1981-06-16 | 1984-07-03 | Frick Company | Volume ratio control means for axial flow helical screw type compressor |
| CN1892039A (en) * | 2005-06-30 | 2007-01-10 | 日立空调·家用电器株式会社 | Two-stage screw compressor |
| CN204268745U (en) * | 2014-11-05 | 2015-04-15 | 烟台荏原空调设备有限公司 | A kind of screw-type refrigerating system and screw compressor thereof |
| CN204921370U (en) * | 2015-09-22 | 2015-12-30 | 特灵空调系统(中国)有限公司 | Helical -lobe compressor |
| CN105782036A (en) * | 2014-12-25 | 2016-07-20 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and internal volume ratio adjusting method for compressor |
-
2020
- 2020-11-26 CN CN202011356290.5A patent/CN112431759A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4457681A (en) * | 1981-06-16 | 1984-07-03 | Frick Company | Volume ratio control means for axial flow helical screw type compressor |
| CN1892039A (en) * | 2005-06-30 | 2007-01-10 | 日立空调·家用电器株式会社 | Two-stage screw compressor |
| CN204268745U (en) * | 2014-11-05 | 2015-04-15 | 烟台荏原空调设备有限公司 | A kind of screw-type refrigerating system and screw compressor thereof |
| CN105782036A (en) * | 2014-12-25 | 2016-07-20 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and internal volume ratio adjusting method for compressor |
| CN204921370U (en) * | 2015-09-22 | 2015-12-30 | 特灵空调系统(中国)有限公司 | Helical -lobe compressor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023155448A1 (en) * | 2022-02-15 | 2023-08-24 | 珠海格力电器股份有限公司 | Screw compressor and control method thereof, and air conditioning device |
| CN114847064A (en) * | 2022-05-26 | 2022-08-05 | 安徽科技学院 | Positioning system is put in noctuid black oophagous wasp field |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112431759A (en) | Compressor with high adjustment precision, control method thereof and air conditioning system | |
| US4609329A (en) | Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an enconomizer inlet port | |
| EP1553300B1 (en) | Variable inner volume ratio-type screw compressor controlled by a frequency converter | |
| US6659729B2 (en) | Screw compressor equipment for accommodating low compression ratio and pressure variation and the operation method thereof | |
| EP2095037B1 (en) | Suction modulation valve for refrigerant system with adjustable opening for pulse width modulation control | |
| WO2013146674A1 (en) | Two-stage compression device | |
| EP1994278B1 (en) | Slide valve with hot gas bypass port | |
| EP2423508B1 (en) | capacity control for a screw compressor | |
| EP2458217B1 (en) | Temperature control through pulse width modulation | |
| JP2004175290A (en) | Control method of refrigeration cycle | |
| CN216812148U (en) | Screw compressor and air conditioning equipment | |
| CN118149514A (en) | Capacity adjusting method and system of screw unit | |
| CN211039038U (en) | Compressor and air conditioning system | |
| CN114352523A (en) | Screw compressor, control method thereof and air conditioning equipment | |
| JPH021998B2 (en) | ||
| WO2021031488A1 (en) | Compressor and air-conditioning system | |
| US10274236B2 (en) | Expansion valve with a two-step variable orifice area | |
| CN109387000B (en) | Stepless energy adjusting device and method for compressor and refrigerating system | |
| WO2006057212A1 (en) | Fluid machine and heat pump employing it | |
| US20230366400A1 (en) | Gas compressor | |
| CN113550902B (en) | Unloading control method of screw compressor | |
| US11953006B2 (en) | Screw compressor and control method therefor | |
| EP2821735A1 (en) | An expansion valve with a variable orifice area | |
| CN115585135A (en) | Screw compressor and air conditioning unit | |
| CN117212166A (en) | Temperature control valve for air compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |