Refrigeration oil circulating device system facing low-pressure circulating barrel

Abstract

The utility model provides a refrigerant oil circulating device system for a low-pressure circulating barrel, which is characterized in that outlets of two fluorine pumps (2) are connected with a liquid supply pipe (12) through two fluorine pump liquid outlet pipes (9), one end of an oil liquid inlet pipe (14) is connected to the liquid supply pipe (12), and the other end of the oil liquid inlet pipe (14) is connected to an inlet at the right lower end of a plate heat exchanger (3); one end of an oil liquid outlet pipe (17) is connected with an outlet in the upper left end of the plate heat exchanger (3), the other end of the oil liquid outlet pipe (17) is connected to an air return pipe (19), an outlet in the top of the low-pressure circulating barrel (1) is connected with the air return pipe (19), an inlet in the lower left end of the plate heat exchanger (3) is connected with a liquid supplementing inlet pipe (15), and one end of a liquid supplementing outlet pipe (16) is connected to an outlet in the upper right end of the plate heat exchanger (3). And the other end of the liquid supplementing outlet pipe (16) is connected with a circulating barrel inlet pipe (20). The system solves the problem of oil shortage of the refrigeration compressor, refrigerant oil is recycled, and the device is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of Freon refrigeration, in particular to a refrigeration oil circulation device system facing a low-pressure circulation barrel. Background Art

[0002] Freon refrigeration system is one of the commonly used refrigeration equipment. It is widely used in industrial and commercial fields because of its high refrigeration capacity, long service life and stable operation. At present, the Freon refrigeration system based on low-pressure circulation barrel can not only provide sufficient cooling capacity to the refrigeration system terminal, but also has a certain gas-liquid separation function, so that the medium flowing to the refrigeration compressor is a gaseous circulating medium. Based on this, the Freon refrigeration system has also become a hot spot in the research of Freon refrigeration system and has a wide range of commercial application value.

[0003] However, when the Freon refrigeration system based on the low-pressure circulation barrel is running for a long time, a large amount of refrigerant oil will accumulate in the low-pressure circulation barrel. If the large amount of refrigerant oil accumulated in the low-pressure circulation barrel cannot be returned to the refrigeration compressor in time, it is very easy to cause abnormal wear of the friction pair of the refrigeration compressor and cause vibration and noise. In severe cases, it will directly affect the refrigeration efficiency of the entire refrigeration system. At present, the refrigerant oil of the Freon refrigeration system has been replaced by synthetic oil instead of mineral oil. Although synthetic oil has a long service life and good lubrication performance, synthetic oil and Freon have good miscibility. The distribution of the Freon working fluid and synthetic oil accumulated in the low-pressure circulation barrel is relatively uniform. If for some reason the mixed liquid of synthetic oil and Freon in the low-pressure circulation barrel increases or a large amount of synthetic oil accumulates in the low-pressure circulation barrel, it will cause the refrigeration compressor to lack oil, affecting the normal operation of the refrigeration system.

[0004] In view of this, in view of the phenomenon that the refrigerant oil and the Freon working fluid in the Freon refrigeration system based on the low-pressure circulation barrel are miscible and accumulated in the low-pressure circulation barrel, thus causing the refrigeration compressor to lack oil, how to separate the refrigerant oil and the Freon mixture in the low-pressure circulation barrel, and then allow the refrigerant oil to flow back into the refrigeration compressor to ensure the normal operation of the Freon refrigeration system, is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above technical defects, in order to ensure the normal oil return of the refrigeration compressor, the utility model achieves the purpose of oil separation and refrigeration oil reflux by adding an oil inlet pipe bypass and a plate heat exchanger, and proposes a refrigeration oil circulation device system for a low-pressure circulation barrel.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: a refrigeration oil circulation device system for a low-pressure circulation barrel, comprising a low-pressure circulation barrel, a fluorine pump, an oil valve assembly, a liquid replenishment valve assembly and a plate heat exchanger, wherein the bottom outlet of the low-pressure circulation barrel is connected to the inlets of two fluorine pumps respectively through two fluorine pump inlet pipes, the outlets of the two fluorine pumps are connected to the liquid supply pipe through two fluorine pump outlet pipes, the top outlet of the low-pressure circulation barrel is connected to the return air pipe, the top inlet of the low-pressure circulation barrel is connected to the circulation barrel inlet pipe, and the oil One end of the inlet pipe is connected to the liquid supply pipe, the other end of the oil inlet pipe is connected to the lower right inlet of the plate heat exchanger, one end of the oil outlet pipe is connected to the upper left outlet of the plate heat exchanger, the other end of the oil outlet pipe is connected to the return air pipe, the lower left inlet of the plate heat exchanger is connected to the liquid replenishment inlet pipe, one end of the liquid replenishment outlet pipe is connected to the upper right outlet of the plate heat exchanger, the other end of the liquid replenishment outlet pipe is connected to the circulation barrel inlet pipe, one end of the two exhaust pipes are respectively connected to the two fluorine pump outlet pipes, and the other ends of the two exhaust pipes are commonly connected to the gas phase pipe.

[0007] The two fluorine pumps are installed in parallel below the low-pressure circulation barrel. A right-angle stop valve and a right-angle filter are installed in sequence on the two fluorine pump inlet pipes along the flow direction of the medium in the pipes. A one-way valve and a first stop valve are installed in sequence along the flow direction of the medium in the two fluorine pump outlet pipes. The connection between the fluorine pump outlet pipe and the exhaust pipe is located between the fluorine pump outlet and the one-way valve. Solenoid valve A is installed on the two exhaust pipes respectively, and the start and stop control lines of solenoid valve A are connected to the system control component.

[0008] Two groups of liquid infusion valve assemblies installed in parallel are installed on the liquid infusion outlet pipe, and the liquid infusion valve assembly includes a fourth stop valve, a straight-through filter B, a solenoid valve C, a throttle valve B and a fifth stop valve. The fourth stop valve, the straight-through filter B, the solenoid valve C, the throttle valve B and the fifth stop valve are installed in sequence along the flow direction of the medium in the liquid infusion outlet pipe, and the start-stop control line of the solenoid valve C is connected to the system control assembly.

[0009] An oil valve assembly is installed on the oil inlet pipe, and the oil valve assembly includes a third stop valve, a straight-through filter A, a solenoid valve B, a throttle valve A and a second stop valve. The third stop valve, the straight-through filter A, the solenoid valve B, the throttle valve A and the second stop valve are installed in sequence along the flow direction of the medium in the oil inlet pipe, and the start-stop control line of the solenoid valve B is connected to the system control assembly.

[0010] The core controller of the system control component is a programmable logic controller PLC, and the start and stop control lines of the solenoid valve A, the solenoid valve B and the solenoid valve C are connected to the analog output end of the programmable logic controller PLC.

[0011] Compared with the prior art, the utility model discloses a refrigeration oil circulation device system for a low-pressure circulation barrel, which can separate the mixed liquid of Freon and refrigeration oil in the low-pressure circulation barrel when the refrigeration system is working, thereby allowing the refrigeration oil to flow back to the refrigeration compressor for use by the refrigeration compressor, while ensuring the normal operation of the refrigeration system. The oil valve group installed on the liquid supply pipe uses a PLC control system to complete the timed opening and closing of solenoid valve B, which greatly improves the circulation of refrigeration oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall system principle diagram of the utility model;

[0013] Figure 2 It is a liquid replenishing valve assembly of the utility model;

[0014] Figure 3 The utility model discloses an oil valve component.

[0015] The markings in the figure are: 1: low-pressure circulation barrel; 2: fluorine pump; 3: plate heat exchanger; 4: right-angle stop valve; 5: right-angle filter; 6: fluorine pump inlet pipe; 7: one-way valve; 8: first stop valve; 9: fluorine pump outlet pipe; 10: solenoid valve A; 11: exhaust pipe; 12: liquid supply pipe; 13: oil valve assembly; 131: second stop valve; 132: throttle valve A; 133: solenoid valve B; 134: straight-through filter A; 135: third stop valve; 14: oil inlet pipe; 15: replenishment inlet pipe; 16: replenishment outlet pipe; 17: oil outlet pipe; 18: replenishment valve assembly; 181: fourth stop valve; 182: straight-through filter B; 183: solenoid valve C; 184: throttle valve B; 185: fifth stop valve; 19: return air pipe; 20: circulation barrel inlet pipe; 21: gas phase pipe. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and implementation effects to be solved by the present utility model clearer, the following is a summary of the technical problems, technical solutions and implementation effects of the present utility model. Figure 1 and 2 , an embodiment of the utility model is further described. In the description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0017] Reference Figure 1 , 2and 3, a refrigeration oil circulation device system for a low-pressure circulation barrel, comprising a low-pressure circulation barrel 1, a fluorine pump 2, an oil valve assembly 13, a liquid replenishment valve assembly 18 and a plate heat exchanger 3, wherein the bottom outlet of the low-pressure circulation barrel 1 is connected to the inlets of the two fluorine pumps 2 through two fluorine pump liquid inlet pipes 6, respectively, the outlets of the two fluorine pumps 2 are connected to the liquid supply pipe 12 through two fluorine pump liquid outlet pipes 9, the top outlet of the low-pressure circulation barrel 1 is connected to the return air pipe 19, the top inlet of the low-pressure circulation barrel 1 is connected to the circulation barrel inlet pipe 20, and one end of the oil inlet pipe 14 is connected to the liquid supply pipe 12 The other end of the oil inlet pipe 14 is connected to the lower right inlet of the plate heat exchanger 3, one end of the oil outlet pipe 17 is connected to the upper left outlet of the plate heat exchanger 3, the other end of the oil outlet pipe 17 is connected to the return air pipe 19, the lower left inlet of the plate heat exchanger 3 is connected to the replenishment inlet pipe 15, one end of the replenishment outlet pipe 16 is connected to the upper right outlet of the plate heat exchanger 3, the other end of the replenishment outlet pipe 16 is connected to the circulation barrel inlet pipe 20, one end of the two exhaust pipes 11 is respectively connected to the two fluorine pump outlet pipes 9, and the other ends of the two exhaust pipes 11 are commonly connected to the gas phase pipe 21.

[0018] The two fluorine pumps 2 are installed in parallel below the low-pressure circulation barrel 1, one of the fluorine pumps 2 is used for normal operation, and the other fluorine pump 2 is used as a standby or for maintenance. A right-angle stop valve 4 and a right-angle filter 5 are installed in sequence on the two fluorine pump inlet pipes 6 along the flow direction of the medium in the pipe. The right-angle stop valve 4 is in a normally open state, ensuring the normal circulation of the medium in the fluorine pump inlet pipe 6. The right-angle filter 5 is used to filter the medium entering the fluorine pump 2 to prevent the medium provided by the fluorine pump 2 from clogging the evaporator.

[0019] A one-way valve 7 and a first stop valve 8 are sequentially installed on the fluorine pump outlet pipe 9 along the flow direction of the medium in the pipe. The one-way valve 7 is used to prevent the medium in the fluorine pump outlet pipe 9 from flowing back. The first stop valve 8 is in a normally open state, thereby ensuring the normal circulation of the medium in the fluorine pump outlet pipe 9. The connection between the fluorine pump outlet pipe 9 and the exhaust pipe 11 is located between the outlet of the fluorine pump 2 and the one-way valve 7. Solenoid valve A 10 is respectively installed on the two exhaust pipes 11, and the start-stop control line of the solenoid valve A 10 is connected to the system control component. When the system is in a shutdown state, the system control component controls the solenoid valve A 10 of the two exhaust pipes 11 to open, and the gas in the fluorine pump 2 will enter the gas phase pipe 21 through the two exhaust pipes 11 to avoid cavitation when the fluorine pump 2 is started; when the system is ready to start, the system control component closes the solenoid valve A 10 of the two exhaust pipes 11, and the medium in the low-pressure circulation barrel 1 enters the fluorine pump 2 along the fluorine pump inlet pipe 6, and then enters the liquid supply pipe 12 along the fluorine pump outlet pipe 9.

[0020] The infusion outlet pipe 16 is provided with two sets of infusion valve assemblies 18 installed in parallel, the infusion valve assembly 18 comprising a fourth stop valve 181, a straight-through filter B 182, a solenoid valve C 183, a throttle valve B 184 and a fifth stop valve 185, the fourth stop valve 181, the straight-through filter B 182, the solenoid valve C 183, the throttle valve B 184 and the fifth stop valve 185 are sequentially installed along the flow direction of the medium in the infusion outlet pipe 16, and the start-stop control line of the solenoid valve C 183 is connected to The system control component, the fourth stop valve 181 and the fifth stop valve 185 are both in the normally open state, and the liquid replenishment outlet pipe 16 is filtered through the straight-through filter B 182 to prevent impurities in the medium in the liquid replenishment outlet pipe 16 from entering the low-pressure circulation barrel 1, and the flow rate of the medium in the liquid replenishment outlet pipe 16 is controlled by the throttle valve B 184. The joint use of the fourth stop valve 181 and the fifth stop valve 185 facilitates the maintenance of the straight-through filter B 182, the solenoid valve C 183 and the throttle valve B 184.

[0021] The oil valve assembly 13 is installed on the oil inlet pipe 14, and the oil valve assembly 13 includes a third stop valve 135, a straight-through filter A 134, a solenoid valve B 133, a throttle valve A 132 and a second stop valve 131. The third stop valve 135, the straight-through filter A 134, the solenoid valve B 133, the throttle valve A 132 and the second stop valve 131 are installed in sequence along the flow direction of the medium in the oil inlet pipe 14. The third stop valve 135 and the second stop valve 131 are both in a normally open state. The joint use of the second stop valve 131 and the third stop valve 135 facilitates the maintenance of the straight-through filter A 134, the solenoid valve B 133 and the throttle valve A 132. The flow rate of the medium in the oil inlet pipe 14 is controlled by the throttle valve A 132, and the medium in the oil inlet pipe 14 is filtered by the straight-through filter A 134. The start-stop control line of the solenoid valve B 133 is connected to the system control component. When the system is in a shutdown state, the system control component Close the two sets of solenoid valve C 183 of the replenishing valve assembly 18 installed in parallel and the solenoid valve B 133 of the oil valve assembly 13; when the system is in normal working condition, if the refrigeration compressor is not short of oil, the two sets of solenoid valve C 183 of the replenishing valve assembly 18 installed in parallel and the solenoid valve B 133 of the oil valve assembly 13 are still in a closed state. If the refrigeration compressor is short of oil, the system control component opens the two sets of solenoid valve C 183 and solenoid valve B 133 of the replenishing valve assembly 18 installed in parallel, and the medium of the oil inlet pipe 14 enters the plate heat exchanger 3, and exchanges heat with the high-temperature medium entering the plate heat exchanger 3 through the replenishing inlet pipe 15 in the plate heat exchanger 3, so that the oil-liquid mixed medium in the oil inlet pipe 14 is separated to form gaseous Freon and liquid refrigerant oil, and the gaseous Freon and liquid refrigerant oil enter the return air pipe 19 of the refrigeration compressor along the oil outlet pipe 17 to provide refrigerant oil for the refrigeration compressor.

[0022] The core controller of the system control component is a programmable logic controller PLC, and the start and stop control lines of the solenoid valve A 10, the solenoid valve B 133 and the solenoid valve C 183 are connected to the analog output terminal of the programmable logic controller PLC.

[0023] The described refrigeration oil circulation device system for low-pressure circulation barrels, when the system is in a shutdown state, the programmable logic controller PLC opens the solenoid valve A 10, closes the solenoid valve B 133 and the solenoid valve C 183, and the gas formed by the evaporation of the liquid medium in the two fluorine pumps 2 under a natural state will enter the gas phase pipe 21 through the two exhaust pipes 11, avoiding cavitation when the fluorine pump 2 is started. When the system is in a normal working state, the programmable logic controller PLC closes the solenoid valve A 10, and the medium in the low-pressure circulation barrel 1 enters the fluorine pump 2 along the fluorine pump inlet pipe 6, and then enters the liquid supply pipe 12 along the fluorine pump outlet pipe 9. If the refrigeration compressor When the machine is not short of oil, solenoid valve C 183 and oil solenoid valve B 133 are still in the closed state. If the refrigeration compressor is short of oil, the programmable logic controller PLC opens solenoid valve B 133 and solenoid valve C 183, and the medium of the oil inlet pipe 14 enters the plate heat exchanger 3, and exchanges heat with the high-temperature medium entering the plate heat exchanger 3 through the replenishing liquid inlet pipe 15 in the plate heat exchanger 3, so that the oil-liquid mixed medium in the oil inlet pipe 14 is separated to form gaseous Freon and liquid refrigerant oil, and the gaseous Freon and liquid refrigerant oil enter the return air pipe 19 of the refrigeration compressor along the oil outlet pipe 17 to provide refrigerant oil for the refrigeration compressor.

[0024] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A refrigeration oil circulation device system for a low-pressure circulation barrel, comprising a low-pressure circulation barrel (1), a fluorine pump (2), an oil valve assembly (13), a liquid replenishment valve assembly (18) and a plate heat exchanger (3), characterized in that: The bottom outlet of the low-pressure circulation barrel (1) is connected to the inlets of the two fluorine pumps (2) through two fluorine pump inlet pipes (6), respectively. The outlets of the two fluorine pumps (2) are connected to the liquid supply pipe (12) through two fluorine pump outlet pipes (9). The top outlet of the low-pressure circulation barrel (1) is connected to the return air pipe (19). The top inlet of the low-pressure circulation barrel (1) is connected to the circulation barrel inlet pipe (20). One end of the oil inlet pipe (14) is connected to the liquid supply pipe (12). The other end of the oil inlet pipe (14) is connected to the lower right inlet of the plate heat exchanger (3). The oil outlet pipe (14) is connected to the return air pipe (19). One end of the oil outlet pipe (17) is connected to the upper left outlet of the plate heat exchanger (3), the other end of the oil outlet pipe (17) is connected to the return air pipe (19), the lower left inlet of the plate heat exchanger (3) is connected to the replenishment inlet pipe (15), one end of the replenishment outlet pipe (16) is connected to the upper right outlet of the plate heat exchanger (3), the other end of the replenishment outlet pipe (16) is connected to the circulation barrel inlet pipe (20), one end of the two exhaust pipes (11) is respectively connected to the two fluorine pump outlet pipes (9), and the other ends of the two exhaust pipes (11) are commonly connected to the gas phase pipe (21).

2. A refrigeration oil circulation device system for a low-pressure circulation barrel according to claim 1, characterized in that: Two fluorine pumps (2) are installed in parallel below the low-pressure circulation barrel (1); a right-angle stop valve (4) and a right-angle filter (5) are installed in sequence on the two fluorine pump inlet pipes (6) along the flow direction of the medium in the pipes; a check valve (7) and a first stop valve (8) are installed in sequence along the flow direction of the medium in the two fluorine pump outlet pipes (9); the connection between the exhaust pipe (11) and the fluorine pump outlet pipe (9) is located between the outlet of the fluorine pump (2) and the check valve (7); solenoid valves A (10) are installed on the two exhaust pipes (11) respectively, and the start and stop control lines of the solenoid valves A (10) are connected to the system control component.

3. The refrigeration oil circulation device system for low-pressure circulation barrel according to claim 1, characterized in that: Two groups of liquid replenishment valve assemblies (18) installed in parallel are installed on the liquid replenishment outlet pipe (16). The liquid replenishment valve assembly (18) comprises a fourth stop valve (181), a straight-through filter B (182), a solenoid valve C (183), a throttle valve B (184) and a fifth stop valve (185). The fourth stop valve (181), the straight-through filter B (182), the solenoid valve C (183), the throttle valve B (184) and the fifth stop valve (185) are installed in sequence along the flow direction of the medium in the liquid replenishment outlet pipe (16). The start-stop control line of the solenoid valve C (183) is connected to the system control assembly.

4. The refrigeration oil circulation device system for low-pressure circulation barrel according to claim 1, characterized in that: An oil valve assembly (13) is installed on the oil inlet pipe (14). The oil valve assembly (13) comprises a third stop valve (135), a straight-through filter A (134), a solenoid valve B (133), a throttle valve A (132) and a second stop valve (131). The third stop valve (135), the straight-through filter A (134), the solenoid valve B (133), the throttle valve A (132) and the second stop valve (131) are installed in sequence along the flow direction of the medium in the oil inlet pipe (14). The start-stop control line of the solenoid valve B (133) is connected to the system control assembly.

5. A refrigeration oil circulation device system for a low-pressure circulation barrel according to claim 1, 2, 3 or 4, characterized in that: The core controller of the system control component is a programmable logic controller PLC, and the start and stop control lines of solenoid valve A (10), solenoid valve B (133) and solenoid valve C (183) are connected to the analog output terminal of the programmable logic controller PLC.

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