High-pressure oil tank system applied to centrifugal compressor

Abstract

The utility model discloses a high-pressure oil tank system applied to a centrifugal compressor, and belongs to the technical field of high-pressure oil tank systems. The high-level oil tank is provided with a remote liquid level meter and is connected with the lubricating oil tank through an automatic oil supplementing pump; the remote transmission liquid level meter is linked with the automatic oil supplementing pump through the controller; a teletransmission pressure gauge is arranged on the high-position pipeline; the top of the high-level oil tank is connected with a high-level emptying pipeline and a low-pressure nitrogen pipeline; the first regulating valve and the second regulating valve are respectively linked with the teletransmission pressure gauge through a controller; a mechanical oil supplementing valve is arranged on the high-position pipeline and is positioned between the transmissible pressure gauge and the oil supply header pipe; the high-level oil tank solves the technical problems that an existing high-level oil tank cannot fully provide stable high oil pressure and cannot fully meet the requirement for long-time oil supply when the oil pressure changes sharply.

Description

Technical Field

[0001] This utility model relates to a high-pressure oil tank system, specifically a high-pressure oil tank system applied to a centrifugal compressor. Background Technology

[0002] For centrifugal compressors, a dedicated lubrication oil supply system is required. For example... Figure 1 As shown, the lubricating oil supply system consists of a lubricating oil tank 6, and two oil pumps 1 (one in operation and one on standby), two water coolers 2, two filters 3, and a pressure reducing valve 9, all connected in sequence to the lubricating oil tank 6. For centrifuges, an accumulator 4 and a high-level oil tank 5 are also added. Under normal operating conditions, one oil pump 1 is in operation, while the other is on standby. After filtration by the filter 3 and cooling by the water cooler 2, the oil pressure is controlled within the specified range by the pressure reducing valve 9 and connected to the main oil supply line 7. The high-level oil tank 5 is connected to the main oil supply line 7 via a high-level pipeline 8. The lubricating oil in the high-level oil tank 5 can flow back to the lubricating oil tank 6 through the pipeline.

[0003] However, during operation, flange leakage is inevitable, causing a sudden drop in oil pressure below the interlock shutdown value. Even after the main oil pump stops, although the standby oil pump starts, the intervals between interlock actions and the standby pump start-up time cannot guarantee the oil pressure will recover within the required time. In more serious cases, the standby oil pump may fail to start or trip after starting, all resulting in delayed oil pressure recovery. The consequences of these situations range from minor issues like the standby pump starting and both pumps maintaining pressure, to more serious issues like the compressor shutting down due to the inability to recover oil pressure quickly. A compressor shutdown is undoubtedly fatal for chemical production.

[0004] Under these abnormal conditions, the high-level oil tank 5 in the lubricating oil supply system replenishes the main oil supply pipe with oil through the static pressure generated by the height difference. This portion of lubricating oil ensures that the centrifuge can stop safely and stably. However, the existing high-level oil tank still cannot provide a stable high oil pressure, and cannot fully meet the long-term oil supply needs when the oil pressure changes drastically, resulting in a short time window for handling defects in the centrifugal compressor oil supply system. Therefore, the existing configuration of the centrifugal compressor oil station cannot effectively guarantee the safe and stable oil pressure. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and proposes a high-pressure oil tank system for centrifugal compressors; it solves the technical problem that existing high-level oil tanks cannot provide a stable high oil pressure and cannot fully meet the long-term oil supply needs when the oil pressure changes drastically.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A high-pressure oil tank system for a centrifugal compressor includes a lubricating oil tank and a high-level oil tank. The lubricating oil tank is connected to the main oil supply line via a pipeline. The high-level oil tank is connected to the main oil supply line via a high-level pipeline. The high-level oil tank is equipped with a remote level gauge. The oil inlet of the high-level oil tank is connected to the oil outlet of the lubricating oil tank via an automatic oil replenishment pipeline. An automatic oil replenishment pump is installed on the automatic oil replenishment pipeline. The remote level gauge is linked to the automatic oil replenishment pump via a controller.

[0008] A remote pressure gauge is installed on the high-level pipeline; a high-point venting pipeline and a low-pressure nitrogen pipeline are connected to the top of the high-level oil tank; a first regulating valve is installed on the high-level venting pipeline; a second regulating valve is installed on the low-pressure nitrogen pipeline; the first and second regulating valves are respectively linked to the remote pressure gauge via a controller; a mechanical oil replenishing valve is installed on the high-level pipeline, and the mechanical oil replenishing valve is located between the remote pressure gauge and the main oil supply pipeline.

[0009] Furthermore, the mechanical oil replenishing valve includes a cavity and a valve body that is slidably disposed within the cavity; the bottom area of ​​the valve body is smaller than the top area of ​​the valve body, the bottom of the valve body is connected to the main oil supply pipe at the upstream position of the mechanical oil replenishing valve via a pipeline, and the top of the valve body is connected to the main oil supply pipe at the downstream position of the mechanical oil replenishing valve via a pipeline.

[0010] Furthermore, a sealing ring is provided on the edge of the valve body.

[0011] Furthermore, the high-point venting pipeline is located below the low-pressure nitrogen pipeline.

[0012] Furthermore, the high-level oil tank is equipped with an electric heater and a remote thermometer; the electric heater and the remote thermometer are linked.

[0013] Furthermore, an oil pump is connected to the outlet of the lubricating oil tank, and the oil pump is connected to the main oil supply pipe in sequence through a water cooler, a filter, and a pressure reducing valve.

[0014] Furthermore, an accumulator is connected to the main oil supply line.

[0015] The beneficial effects of this utility model compared to the prior art are as follows:

[0016] By adding stable high oil pressure, a matching mechanical oil replenishing valve, constant temperature control, and stable liquid level control to the existing high-level oil tank design concept, long-term oil supply can be achieved when the oil pressure changes drastically. This provides the production unit with a time window to handle defects in the centrifugal compressor oil supply system. When it is necessary to shut down the compressor, sufficient time can be reserved for the production unit to handle the situation. This effectively avoids compressor shutdown caused by failure of the lubricating oil supply system, improves safety, and provides a time window for safe handling of the production unit, avoiding secondary accidents and economic losses caused by compressor shutdown due to oil station problems. Attached Figure Description

[0017] Figure 1 This is a connection diagram of the high-pressure oil tank system of an existing centrifugal compressor;

[0018] Figure 2 This is a connection diagram of the high-pressure oil tank system of the centrifugal compressor of this utility model;

[0019] Figure 3 yes Figure 2 Enlarged view of section A;

[0020] Figure 4 yes Figure 3 Enlarged view of section B;

[0021] Figure label:

[0022] 1. Oil pump; 2. Water cooler; 3. Filter; 4. Accumulator; 5. High-level oil tank; 6. Lubricating oil tank; 7. Main oil supply line; 8. High-level pipeline; 9. Pressure reducing valve; 10. Remote level gauge; 11. Automatic oil replenishment pipeline; 12. Automatic oil replenishment pump; 13. High-point venting pipeline; 14. Low-pressure nitrogen pipeline; 15. First regulating valve; 16. Second regulating valve; 17. Remote pressure gauge; 18. Mechanical oil replenishment valve; 19. Cavity; 20. Valve body; 21. Sealing ring; 22. Electric heater; 23. Remote thermometer. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0024] See Figures 2 to 4As shown, this embodiment proposes a high-pressure oil tank system for a centrifugal compressor, including a lubricating oil tank 6 and a high-level oil tank 5. An oil pump 1 is connected to the outlet of the lubricating oil tank 6. The oil pump 1 is connected to the main oil supply pipe 7 via a water cooler 2, a filter 3, and a pressure reducing valve 9. An accumulator 4 is connected to the main oil supply pipe 7 to supply oil to the centrifugal compressor. The high-level oil tank 5 is connected to the main oil supply pipe 7 via a high-level pipeline 8. When the oil pressure in the main oil supply pipe 7 decreases, the high-level oil tank 5 supplies oil to the centrifugal compressor. A centrifugal compressor supplies oil. To improve the pressure stabilization effect of the high-level oil tank 5, in this embodiment, a remote level gauge 10 is installed in the high-level oil tank 5. The oil inlet of the high-level oil tank 5 is connected to the oil outlet of the lubricating oil tank 6 through an automatic oil replenishment pipeline 11. An automatic oil replenishment pump 12 is installed on the automatic oil replenishment pipeline 11. The remote level gauge 10 is linked to the automatic oil replenishment pump 12 through a controller. During normal operation, the oil level in the high-level oil tank 5 remains stable, maintained between the low warning value and the high warning value. When the oil level in the high-level oil tank 5 is lower than the low warning value, an alarm signal is sent to the control system. The operator needs to check the pipeline for leaks and other issues on-site. At the same time, a control signal is sent to start the automatic oil replenishment pump 12 to replenish the oil level in the high-level oil tank 5. When the oil level in the high-level oil tank 5 reaches the high warning value, an alarm signal is also sent to the control system, and a control signal is sent to stop the automatic oil replenishment pump 12. This process is repeated to achieve stable control of the oil level in the high-level oil tank 5.

[0025] A remote pressure gauge 17 is installed on the high-level pipeline 8; the top of the high-level oil tank 5 is connected to a high-point vent pipeline 13 and a low-pressure nitrogen pipeline 14, with the high-point vent pipeline 13 located below the low-pressure nitrogen pipeline 14. A first regulating valve 15 is installed on the high-level vent pipeline 13; a second regulating valve 16 is installed on the low-pressure nitrogen pipeline 14; the first regulating valve 15 and the second regulating valve 16 are respectively linked with the remote pressure gauge 17 through a controller to achieve oil pressure control; when the pressure in the high-level oil tank 5 is higher than the set pressure, the first regulating valve 15 opens, releasing the excess pressure to the atmosphere through the high-level vent pipeline 13; when the pressure in the high-level oil tank 5 is lower than the set pressure, the second regulating valve 16 opens, replenishing the pressure to the set value through the low-pressure nitrogen supplied by the low-pressure nitrogen pipeline 14.

[0026] A mechanical oil replenishing valve 18 is provided on the high-position pipeline 8, and the mechanical oil replenishing valve 18 is located between the remote pressure gauge 17 and the oil supply main pipe 7. The mechanical oil replenishing valve 18 includes a cavity 19 and a valve body 20 that is hermetically and slidably arranged in the cavity 19; a sealing ring 21 is provided at the edge of the valve body 20. The bottom area S1 of the valve body 20 is smaller than the top area S2 of the valve body 20. The bottom of the valve body 20 is connected to the oil supply main pipe 7 at the position before the mechanical oil replenishing valve 18 through a pipeline, and the top of the valve body 20 is connected to the oil supply main pipe 7 at the position after the mechanical oil replenishing valve 18 through a pipeline. The mechanical oil replenishing valve 18 is switched on under the action of the pressure difference on both sides. Under normal circumstances, P1 > P2 (P1 is the oil pressure before the valve, P2 is the oil pressure after the valve, the oil pressure before the valve is slightly greater than the oil pressure after the valve, and a sufficient safety margin is left for the oil pressure to prevent pressure loss when the mechanical oil replenishing valve is opened instantaneously), S1 < S2; under the action of the forces on both sides, P1*S1 < P2*S2; the mechanical oil replenishing valve 18 is closed. When the pressure after the mechanical oil replenishing valve 18 decreases, that is, P1*S1 > P2*S2, the mechanical oil replenishing valve 18 opens to replenish oil and boost the pressure of the oil supply main pipe 7. The effective oil level of the high-position oil tank 5 and the orifice plate after the mechanical oil replenishing valve determine the time window for the entire oil replenishing system to handle the oil supply system of the centrifuge unit and the safety disposal of the production device, and can be designed and adjusted specifically according to the time.

[0027] An electric heater 22 and a remote thermometer 23 are provided inside the high-position oil tank 5; the electric heater 22 is linked with the remote thermometer 23. The oil temperature control is realized by the interlock of the remote thermometer 23 and the electric heater 22. When the oil temperature of the high-position oil tank 5 is lower than the low warning value, an alarm signal is sent to the control system, and at the same time, a control signal is sent to start the electric heater 22 to heat the high-position oil tank 5. When the oil temperature of the high-position oil tank 5 is higher than the high warning value, an alarm signal is sent to the control system, and at the same time, a control signal is sent to stop the electric heater 22. Repeating like this, the stable control of the oil temperature of the high-position oil tank 5 is realized.

[0028] The high-position oil tank 5 realizes the function of stabilizing the pressure through the first regulating valve 15 and the second regulating valve 16; the electric heater 22 and the remote thermometer 23 are configured to realize the constant temperature control of the high-position oil tank 5; the remote liquid level gauge 10 and the automatic oil replenishing pump 12 are assigned to realize the automatic control and stability of the liquid level; a mechanical oil replenishing valve 18 (closed under the action of the front and rear pressures) is installed at the connection between the bottom of the high-position oil tank 5 and the oil supply main pipe 7, and automatically opens when the pressure of the oil supply main pipe 7 decreases to replenish oil and boost the pressure of the oil supply main pipe 7; maintain the operation index of the oil circuit and grab a time window for the lubricating oil system problem handling or the production device process disposal.

[0029] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A high-pressure oil tank system for a centrifugal compressor, comprising a lubricating oil tank (6) and a high-level oil tank (5), wherein the lubricating oil tank (6) is connected to a main oil supply pipe (7) via a pipeline; and the high-level oil tank (5) is connected to the main oil supply pipe (7) via a high-level pipeline (8); characterized in that, The high-level oil tank (5) is equipped with a remote level gauge (10), and the oil inlet of the high-level oil tank (5) is connected to the oil outlet of the lubricating oil tank (6) through an automatic oil replenishment pipeline (11); an automatic oil replenishment pump (12) is installed on the automatic oil replenishment pipeline (11); the remote level gauge (10) is linked with the automatic oil replenishment pump (12) through a controller; A remote pressure gauge (17) is installed on the high-level pipeline (8); a high-point venting pipeline (13) and a low-pressure nitrogen pipeline (14) are connected to the top of the high-level oil tank (5); a first regulating valve (15) is installed on the high-level venting pipeline (13); a second regulating valve (16) is installed on the low-pressure nitrogen pipeline (14); the first regulating valve (15) and the second regulating valve (16) are respectively linked to the remote pressure gauge (17) through a controller; a mechanical oil replenishing valve (18) is installed on the high-level pipeline (8); the mechanical oil replenishing valve (18) is located between the remote pressure gauge (17) and the main oil supply pipeline (7).

2. The high-pressure oil tank system for a centrifugal compressor according to claim 1, characterized in that, The mechanical oil replenishing valve (18) includes a cavity (19) and a valve body (20) that is sealed and slidably disposed in the cavity (19); the bottom area of ​​the valve body (20) is smaller than the top area of ​​the valve body (20), the bottom of the valve body (20) is connected to the main oil supply pipe (7) at the front position of the mechanical oil replenishing valve (18) through a pipeline, and the top of the valve body (20) is connected to the main oil supply pipe (7) at the rear position of the mechanical oil replenishing valve (18) through a pipeline.

3. A high-pressure oil tank system for a centrifugal compressor according to claim 2, characterized in that, A sealing ring (21) is provided on the edge of the valve body (20).

4. A high-pressure oil tank system for a centrifugal compressor according to claim 1, characterized in that, The high-point venting pipeline (13) is located below the low-pressure nitrogen pipeline (14).

5. A high-pressure oil tank system for a centrifugal compressor according to claim 1, characterized in that, The high-level oil tank (5) is equipped with an electric heater (22) and a remote thermometer (23); the electric heater (22) and the remote thermometer (23) are linked together.

6. A high-pressure oil tank system for a centrifugal compressor according to claim 1, characterized in that, The outlet of the lubricating oil tank (6) is connected to an oil pump (1), which is connected to the main oil supply pipe (7) in sequence through a water cooler (2), a filter (3), and a pressure reducing valve (9).

7. A high-pressure oil tank system for a centrifugal compressor according to claim 6, characterized in that, An accumulator (4) is connected to the main oil supply pipe (7).

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