CN216868871U - Parallel refrigerating unit lubricating oil cooling system based on siphon type liquid accumulator - Google Patents
Parallel refrigerating unit lubricating oil cooling system based on siphon type liquid accumulator Download PDFInfo
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- CN216868871U CN216868871U CN202220424039.6U CN202220424039U CN216868871U CN 216868871 U CN216868871 U CN 216868871U CN 202220424039 U CN202220424039 U CN 202220424039U CN 216868871 U CN216868871 U CN 216868871U
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Abstract
The utility model discloses a lubricating oil cooling system of a parallel refrigerating unit based on a siphon liquid storage device, which comprises a parallel refrigerating compressor (1), a PLC (programmable logic controller) control cabinet (2), an oil storage device (3), an oil separator (4), a temperature sensor A (5), an evaporative condenser (6), a siphon liquid storage device (7), a cooling water pump electromagnetic valve (8), a circulating pump (9), a plate type heat exchanger (10), an electromagnetic valve A (11), an electromagnetic valve B (12) and a temperature sensor B (13). The lubricating oil cooling system cools lubricating oil of a refrigerating system through a low-temperature liquid refrigerant introduced into the siphon-type liquid accumulator (7), ensures that the lubricating oil flowing back to the parallel refrigeration compressor (1) is within a design value range, and further reduces the exhaust temperature of the parallel refrigeration compressor (1).
Description
Technical Field
The utility model relates to the technical field of parallel refrigerating units, in particular to the technical field of lubricating and cooling of compressors, and particularly relates to a lubricating oil cooling system of a parallel refrigerating unit based on a siphon liquid accumulator.
Background
The parallel refrigerating unit is a refrigerating system in which two or more compressors are connected in parallel, and a plurality of compressors share parts such as a condenser, a liquid storage device, an oil separator and the like, thereby providing the required refrigerating capacity for the whole refrigeration house system. Compared with a single-unit refrigerating system, the parallel refrigerating unit can scientifically and reasonably match the dynamic cold load of the whole refrigeration house system, and when the cold quantity required by the whole refrigeration house system is smaller, a compressor or a small-capacity compressor can be started less; when the cooling capacity of the whole refrigeration house system is large, more compressors or compressors with large capacity can be started. Therefore, the parallel refrigerating units can ensure that the units run in the most economical mode, the energy is saved to the maximum extent, and the service life of the whole unit is prolonged to the maximum extent.
However, the parallel connection refrigerating units also have a plurality of technical problems, wherein the overhigh exhaust temperature of the parallel connection refrigerating units is one of the common technical problems of the parallel connection refrigerating units. When the exhaust temperature of the parallel refrigerating unit is too high, the phenomena of overheating of the compressor, failure of lubricating oil of the refrigerating system, deterioration of refrigerant and lubricating oil, shortening of the service life of the compressor and the like are caused, and the safety and the stability of the parallel refrigerating unit are directly influenced. When the exhaust temperature of the parallel refrigeration unit is too high, the lubricating oil of the refrigeration system is discharged along the exhaust port of the compressor together with the refrigerant, so that the temperature of the lubricating oil of the refrigeration system is also increased rapidly, if the lubricating oil of the refrigeration system is not cooled sufficiently and directly flows back to the parallel refrigeration compressor, the inlet temperature of the compressor is also increased along with the lubricating oil, and the exhaust temperature of the parallel refrigeration compressor is continuously increased repeatedly, so that the safety and the stability of the whole refrigeration system are severely restricted. In view of this, how to effectively reduce the temperature of the lubricating oil of the refrigeration system to be stabilized within the design value range, thereby ensuring that the intake temperature and the exhaust temperature of the parallel refrigeration compressors are always within a reasonable range, is a technical problem to be solved urgently by the parallel refrigeration unit.
SUMMERY OF THE UTILITY MODEL
In view of the above technical defects, the present invention provides a lubricating oil cooling system for a parallel refrigerating unit based on a siphon type liquid accumulator, wherein a low-temperature liquid refrigerant introduced into the siphon type liquid accumulator is used to cool lubricating oil of the refrigerating system, so as to ensure that the lubricating oil flowing back to a parallel refrigerating compressor is within a designed value range, and further reduce the exhaust temperature of the parallel refrigerating compressor.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a parallelly connected refrigerating unit lubricating oil cooling system based on hydrocone type reservoir, including parallelly connected compressor, the PLC switch board, the oil conservator, the oil separator, temperature sensor first, evaporative condenser, hydrocone type reservoir, cooling water pump solenoid valve, the circulating pump, plate heat exchanger, solenoid valve first, solenoid valve second and temperature sensor second, wherein parallelly connected compressor, PLC switch board and oil conservator are installed in the frame of parallelly connected refrigerating unit, parallelly connected compressor's gas vent is connected with the import of oil separator through the exhaust collector, the upper end export of oil separator is connected to evaporative condenser's import through the pipeline, the lower extreme export of oil separator is connected to plate heat exchanger's upper left side import department through solenoid valve second, plate heat exchanger's lower left side export is connected to the import of oil conservator through the pipeline, temperature sensor second is installed on the pipeline between plate heat exchanger's lower left side export and the import of oil conservator and is close to plate heat exchanger The outlet of the oil storage device is respectively connected to the oil inlet of the parallel refrigeration compressor through an oil collecting pipe, the inlet of the upper left side of the plate heat exchanger is connected with the outlet of the lower left side of the plate heat exchanger through a solenoid valve A, the outlet of the evaporative condenser is connected with the inlet of the siphon liquid storage device, the outlet of the siphon liquid storage device is connected with the inlet of the upper right side of the plate heat exchanger through a cooling water pump solenoid valve and a circulating pump sequentially through a pipeline, the outlet of the lower right side of the plate heat exchanger is connected to the inlet of the evaporative condenser through a pipeline, and a temperature sensor A is fixedly installed on the side wall of the oil separator and close to the bottom.
And signal control lines of the temperature sensor A and the temperature sensor B are respectively connected with an input port of an S7-200 type programmable controller of the PLC control cabinet.
And start-stop control lines of the parallel refrigeration compressor, the circulating pump, the cooling water pump electromagnetic valve, the electromagnetic valve A and the electromagnetic valve B are respectively connected with an S7-200 type programmable controller of the PLC control cabinet.
When the parallel refrigerating unit runs, a temperature sensor A monitors the temperature value of lubricating oil passing through an oil separator in real time on line, an S7-200 type programmable controller of a PLC control cabinet acquires the temperature value of the lubricating oil of the temperature sensor A, and the S7-200 type programmable controller judges that the temperature value of the lubricating oil is in a designed value range, the S7-200 type programmable controller of the PLC control cabinet sends a program command to enable an electromagnetic valve A and an electromagnetic valve B to be in a normally open state, and a cooling water pump electromagnetic valve and a circulating pump to be in a normally closed state; if the temperature value of the lubricating oil collected by the S7-200 type programmable controller of the PLC control cabinet is higher than the design value range, the S7-200 type programmable controller of the PLC control cabinet sends a program command, the execution solenoid valve A is kept normally open, the solenoid valve B is closed, the cooling water pump solenoid valve is opened, and a circulating pump is started, at the moment, the temperature sensor B monitors the temperature value of the lubricating oil which flows back to the oil reservoir after being cooled by the plate heat exchanger on line in real time, if the temperature of the lubricating oil monitored by the temperature sensor B is still higher than the design value range, the S7-200 type programmable controller of the PLC control cabinet sends the program command, and the command of increasing the opening degree of the cooling water pump solenoid valve and the rotating speed of the circulating pump is executed until the temperature of the lubricating oil monitored by the temperature sensor B is restored to the design value range; in the process of cooling the lubricating oil of the parallel refrigerating unit, the temperature sensor A monitors the temperature value of the lubricating oil passing through the oil separator in real time on line, when the temperature value of the lubricating oil of the oil separator is restored to be within the range of the designed value, the S7-200 type programmable controller of the PLC control cabinet sends a program command, the commands of normally opening the electromagnetic valve A, opening the electromagnetic valve B, closing the electromagnetic valve of the cooling water pump and stopping the circulating pump are executed, and the steps are repeated in a cycle, so that the temperature of the lubricating oil which flows back to the oil inlet hole of the parallel refrigerating compressor is always ensured to be within the range of the designed value, and the exhaust temperature of the parallel refrigerating compressor is further reduced.
Drawings
FIG. 1 is a schematic diagram of the overall system of the present invention.
Labeled in the figure as: 1: a parallel refrigeration compressor; 2: a PLC control cabinet; 3: an oil reservoir; 4: an oil separator; 5: a temperature sensor A; 6: an evaporative condenser; 7: a siphon-type reservoir; 8: a cooling water pump solenoid valve; 9: a circulation pump; 10: a plate heat exchanger; 11: a first electromagnetic valve; 12: a solenoid valve B; 13: and a temperature sensor B.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The lubricating oil cooling system of the parallel refrigerating unit based on the siphon liquid accumulator comprises a parallel refrigerating compressor 1, a PLC control cabinet 2, an oil accumulator 3, an oil separator 4, a temperature sensor A5, an evaporative condenser 6, a siphon liquid accumulator 7, a cooling water pump electromagnetic valve 8, a circulating pump 9, a plate heat exchanger 10, an electromagnetic valve A11, an electromagnetic valve B12 and a temperature sensor B13, wherein the parallel refrigerating compressor 1, the PLC control cabinet 2 and the oil accumulator 3 are installed on a rack of the parallel refrigerating unit, an exhaust port of the parallel refrigerating compressor 1 is connected with an inlet of the oil separator 4 through an exhaust gas collecting pipe, an upper end outlet of the oil separator 4 is connected to an inlet of the evaporative condenser 6 through a pipeline, a lower end outlet of the oil separator 4 is connected to an upper left side inlet of the plate heat exchanger 10 through the electromagnetic valve B12, a lower left side outlet of the plate heat exchanger 10 is connected to an inlet of the oil accumulator 3 through a pipeline, the temperature sensor B13 is installed on a pipeline between the outlet of the lower left side of the plate type heat exchanger 10 and the inlet of the oil reservoir 3 and is close to the outlet of the lower left side of the plate type heat exchanger 10, the outlet of the oil reservoir 3 is connected to the oil inlet of the parallel refrigeration compressor 1 through an oil collecting pipe respectively, the inlet of the upper left side of the plate type heat exchanger 10 is connected with the outlet of the lower left side of the plate type heat exchanger 10 through a solenoid valve A11, the outlet of the evaporative condenser 6 is connected with the inlet of a siphon liquid storage device 7, the outlet of the siphon liquid storage device 7 is connected with the inlet of the upper right side of the plate type heat exchanger 10 through a pipeline sequentially passing through a cooling water pump solenoid valve 8 and a circulating pump 9, the outlet of the lower right side of the plate type heat exchanger 10 is connected to the inlet of the evaporative condenser 6 through a pipeline, and the temperature sensor A5 is fixedly installed on the side wall of the oil separator 4 and is close to the bottom.
And the signal control lines of the temperature sensor A5 and the temperature sensor B13 are respectively connected with the input port of an S7-200 type programmable controller of the PLC control cabinet 2.
And start-stop control lines of the parallel refrigeration compressor 1, the circulating pump 9, the cooling water pump electromagnetic valve 8, the electromagnetic valve A11 and the electromagnetic valve B12 are respectively connected with an S7-200 type programmable controller of the PLC control cabinet 2.
When the parallel refrigerating unit runs, a temperature value of lubricating oil passing through the oil separator 4 is monitored on line in real time by the temperature sensor A5, the temperature value of the lubricating oil of the temperature sensor A5 is collected by the S7-200 type programmable controller of the PLC control cabinet 2, and when the temperature value of the lubricating oil is judged to be in a designed value range by the S7-200 type programmable controller, a program command is sent by the S7-200 type programmable controller of the PLC control cabinet 2, so that the electromagnetic valve A11 and the electromagnetic valve B12 are in a normally open state, and the electromagnetic valve 8 of the cooling water pump and the circulating pump 9 are in a normally closed state; if the temperature value of the lubricating oil collected by the temperature sensor A5 by the S7-200 type programmable controller of the PLC control cabinet 2 is higher than the designed value range, sending a program command by an S7-200 type programmable controller of the PLC control cabinet 2, executing a command that an electromagnetic valve A11 is kept normally open, an electromagnetic valve B12 is closed, a cooling water pump electromagnetic valve 8 is opened and a circulating pump 9 is started, monitoring the temperature value of lubricating oil which flows back to an oil reservoir 3 after being cooled by a plate heat exchanger 10 on line in real time by a temperature sensor B13 at the moment, if the temperature of the lubricating oil monitored by the temperature sensor B13 is still higher than a designed value range, sending the program command by the S7-200 type programmable controller of the PLC control cabinet 2, and executing a command of increasing the opening of the cooling water pump electromagnetic valve 8 and the rotating speed of the circulating pump 9 until the temperature of the lubricating oil monitored by the temperature sensor B13 is restored to the designed value range; in the process of cooling the lubricating oil of the parallel refrigerating unit, the temperature sensor A5 monitors the temperature value of the lubricating oil passing through the oil separator 4 on line in real time, when the temperature value of the lubricating oil of the oil separator 4 is restored to be within the range of the design value, the S7-200 type programmable controller of the PLC control cabinet 2 sends a program command, and the commands of keeping the electromagnetic valve A11 normally open, opening the electromagnetic valve B12, closing the electromagnetic valve 8 of the cooling water pump and stopping the circulating pump 9 are executed, and the steps are repeated in a cycle, so that the temperature of the lubricating oil flowing back to the oil inlet of the parallel refrigerating compressor 1 is always ensured to be within the range of the design value, and the exhaust temperature of the parallel refrigerating compressor 1 is further reduced.
Claims (3)
1. The utility model provides a parallelly connected refrigerating unit lubricating oil cooling system based on hydrocone type reservoir, includes parallelly connected compressor (1), PLC switch board (2), oil conservator (3), oil separator (4), temperature sensor first (5), evaporative condenser (6), hydrocone type reservoir (7), cooling water pump solenoid valve (8), circulating pump (9), plate heat exchanger (10), solenoid valve first (11), solenoid valve second (12) and temperature sensor second (13), its characterized in that: the parallel refrigeration compressor (1), the PLC control cabinet (2) and the oil storage device (3) are arranged on a frame of the parallel refrigeration unit, an exhaust port of the parallel refrigeration compressor (1) is connected with an inlet of the oil separator (4) through an exhaust gas collecting pipe, an upper outlet of the oil separator (4) is connected to an inlet of the evaporative condenser (6) through a pipeline, a lower outlet of the oil separator (4) is connected to an inlet on the left upper side of the plate heat exchanger (10) through an electromagnetic valve B (12), a left lower outlet of the plate heat exchanger (10) is connected to an inlet of the oil storage device (3) through a pipeline, a temperature sensor B (13) is arranged on the pipeline between the left lower outlet of the plate heat exchanger (10) and the inlet of the oil storage device (3) and is close to the left lower outlet of the plate heat exchanger (10), the outlet of the oil storage device (3) is respectively connected to an oil inlet of the parallel refrigeration compressor (1) through an oil collecting pipe, an upper left side inlet and a lower left side outlet of the plate type heat exchanger (10) are connected through a solenoid valve A (11), an outlet of the evaporative condenser (6) is connected with an inlet of a siphon liquid storage device (7), an outlet of the siphon liquid storage device (7) is connected with an upper right side inlet of the plate type heat exchanger (10) through a cooling water pump solenoid valve (8) and a circulating pump (9) in sequence through a pipeline, a lower right side outlet of the plate type heat exchanger (10) is connected to an inlet of the evaporative condenser (6) through a pipeline, and a temperature sensor A (5) is fixedly installed on the side wall of the oil separator (4) and is close to the bottom.
2. The siphonic-accumulator-based lubricating oil cooling system for a parallel refrigeration unit according to claim 1, wherein: and signal control lines of the temperature sensor A (5) and the temperature sensor B (13) are respectively connected with an input port of an S7-200 type programmable controller of the PLC control cabinet (2).
3. The siphonic-reservoir-based lubricating oil cooling system for a parallel refrigeration unit according to claim 1, wherein: the start-stop control lines of the parallel refrigeration compressor (1), the circulating pump (9), the cooling water pump electromagnetic valve (8), the electromagnetic valve A (11) and the electromagnetic valve B (12) are respectively connected with an S7-200 type programmable controller of the PLC control cabinet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220424039.6U CN216868871U (en) | 2022-03-01 | 2022-03-01 | Parallel refrigerating unit lubricating oil cooling system based on siphon type liquid accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220424039.6U CN216868871U (en) | 2022-03-01 | 2022-03-01 | Parallel refrigerating unit lubricating oil cooling system based on siphon type liquid accumulator |
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| Publication Number | Publication Date |
|---|---|
| CN216868871U true CN216868871U (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220424039.6U Active CN216868871U (en) | 2022-03-01 | 2022-03-01 | Parallel refrigerating unit lubricating oil cooling system based on siphon type liquid accumulator |
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| CN (1) | CN216868871U (en) |
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2022
- 2022-03-01 CN CN202220424039.6U patent/CN216868871U/en active Active
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