Mechanically sealed water-saving device

Abstract

The utility model relates to a mechanical sealing device, in particular to a water-saving device of a mechanical seal, which consists of a water replenishing pipeline and a circulating pipeline, one end of the water replenishing pipeline is connected with an external water source; the circulating pipeline is connected with the other end of the water replenishing pipeline; wherein a first one-way valve is arranged in the water supplementing pipeline; a heat exchanger, a third check valve and a fourth check valve are arranged in the circulating pipeline; the two ends of the heat exchanger are connected with the LBO end and the LBI end of the sealing cavity of the pump respectively, a third one-way valve is arranged between the heat exchanger and the LBI end of the sealing cavity, and a fourth one-way valve is arranged between the heat exchanger and the LBO end of the sealing cavity. The circulating pipeline enables the sealing water to be recycled in the pipeline all the time and not to be discharged and lost; the water replenishing pipeline replenishes reduced water in the circulating pipeline in time, so that stable pressure and water quantity in the pipeline are ensured, and a large amount of water resources are saved; the problems that mechanical sealing is frequently started and stopped, and sealing water consumption is huge are solved.

Description

Technical Field

[0001] This utility model relates to a mechanical seal device, and more particularly to a water-saving device for a mechanical seal. Background Technology

[0002] Mechanical seals have advantages such as low leakage and long service life, and are widely used in shaft sealing devices for rotating fluid machinery.

[0003] The frequent start-stop cycles of mechanical seals in pumps cause significant pressure fluctuations within the pump's sealing chamber. This necessitates that the mechanical seal operate under high sealing water pressure, and continuously for 24 hours, resulting in extremely high sealing water consumption. A single pump consumes approximately 2.5 tons of sealing water per day, exceeding 800 tons per year, leading to high production and maintenance costs. Utility Model Content

[0004] To address the problem of frequent start-stop cycles and excessive sealing water consumption in mechanical seals of pumps, this invention designs a water-saving device for mechanical seals, comprising a water supply pipeline and a circulation pipeline. The water supply pipeline includes a first check valve; the circulation pipeline includes a heat exchanger, a third check valve, and a fourth check valve. The two ends of the heat exchanger are connected to the LBO and LBI ends of the pump's sealing cavity, respectively. A third check valve is installed between the heat exchanger and the LBI end of the sealing cavity, and a fourth check valve is installed between the heat exchanger and the LBO end of the sealing cavity. One end of the water supply pipeline is connected to an external water source, and the other end of the circulation pipeline is connected to the water supply pipeline. The sealing water is continuously circulated within the circulation pipeline without being discharged or lost. The water supply pipeline promptly replenishes the sealing water leaking from the mechanical seal, thereby saving a significant amount of water resources and solving the problem of frequent start-stop cycles and excessive sealing water consumption in mechanical seals.

[0005] The present invention adopts the following technical solution:

[0006] A water-saving device with a mechanical seal, comprising:

[0007] The water supply pipeline is connected to an external water source at one end.

[0008] The circulation pipeline is connected to the other end of the water supply pipeline;

[0009] The water supply pipeline is equipped with a first check valve;

[0010] The circulation pipeline includes a heat exchanger, a third check valve, and a fourth check valve; the two ends of the heat exchanger are respectively connected to the LBO end and the LBI end of the sealing cavity of the pump; the third check valve is provided between the heat exchanger and the LBI end of the sealing cavity; and the fourth check valve is provided between the heat exchanger and the LBO end of the sealing cavity.

[0011] Preferably, a check valve is arranged in the water supply pipeline, and the check valve is connected in series with the first one-way valve.

[0012] Preferably, a flow meter is installed in the water supply pipeline, with one end of the flow meter connected to the valve of the external water source and the other end connected to the first one-way valve.

[0013] Preferably, the water supply pipeline is equipped with an inlet valve, which is connected in parallel with the series pipeline of the first one-way valve and the check valve.

[0014] Preferably, an accumulator is connected to the main pipe of the water supply pipeline. The accumulator is located after the parallel structure formed by the first one-way valve, the check valve, and the inlet valve. A second one-way valve is installed between the accumulator and the main pipe of the water supply pipeline.

[0015] Preferably, a pressure gauge is connected to the main pipe of the water supply pipeline, and the pressure gauge is located after the accumulator.

[0016] Preferably, the main pipe of the water supply pipeline is connected to a drain valve, which is located between the pressure gauge and the first one-way valve, the check valve, and the water inlet valve in a parallel structure.

[0017] Preferably, a thermometer is connected to the main pipe of the circulation pipeline, and the thermometer is located between the heat exchanger and the third one-way valve.

[0018] Preferably, an exhaust valve is connected to the main pipe of the circulation pipeline, and the exhaust valve is located between the heat exchanger and the fourth one-way valve.

[0019] The beneficial effects of this utility model are as follows:

[0020] A water-saving device for a mechanical seal comprises a water supply pipeline and a circulation pipeline. The water supply pipeline includes a first check valve. The circulation pipeline includes a heat exchanger, a third check valve, and a fourth check valve. The two ends of the heat exchanger are connected to the LBO and LBI ends of the pump's sealing chamber, respectively. A third check valve is installed between the heat exchanger and the LBI end of the sealing chamber, and a fourth check valve is installed between the heat exchanger and the LBO end of the sealing chamber. One end of the water supply pipeline is connected to an external water source, and the other end of the circulation pipeline is connected to the water supply pipeline. The sealing water is continuously circulated within the circulation pipeline without being discharged or lost. The water supply pipeline promptly replenishes the sealing water leaking from the mechanical seal, thereby saving a significant amount of water resources and solving the problem of frequent mechanical seal start-stop cycles and high sealing water consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the water-saving device of this utility model;

[0022] The diagram is marked as follows:

[0023] 10: Water supply pipeline; 20: Circulation pipeline;

[0024] 11: Flow meter; 12: Inlet valve; 13: Accumulator; 14: Pressure gauge; 15: Check valve; 16: Drain valve; 101: First check valve; 102: Second check valve;

[0025] 21: Thermometer; 22: Heat exchanger; 23: Exhaust valve; 24: Sealing chamber; 201: Third check valve; 202: Fourth check valve. Detailed Implementation

[0026] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings of the embodiments.

[0027] Figure 1 This is a schematic diagram of the water-saving device in this embodiment. Figure 1 As shown, a water-saving device for a mechanical seal consists of a water supply pipe 10 and a circulation pipe 20. The circulation pipe 20 allows the sealing water to circulate within it, carrying away the heat generated during the operation of the mechanical seal and maintaining the pressure and water volume during the operation of the mechanical seal; the water supply pipe 10 replenishes the sealing water that is reduced in the circulation pipe 20 in a timely manner.

[0028] The following is a detailed discussion of each component of the water-saving device.

[0029] The main pipe of the water supply pipeline 10 has a flow meter 11, an inlet valve 12, an accumulator 13, a pressure gauge 14, a check valve 15, a first one-way valve 101, a second one-way valve 102, and a drain valve 16. The flow meter 11 is located at the front end of the water supply pipeline 10. One end of the flow meter 11 is connected to the valve at point S, which is directly connected to the external water source. The other end of the flow meter 11 is connected to the first one-way valve 101, and the other end of the first one-way valve 101 is connected to the check valve 15. The other end of the check valve 15 is connected to the main pipe of the water supply pipeline 10. Thus, clean water enters the main pipe of the water supply pipeline 10, passes through the flow meter 11, the first one-way valve 101, and the check valve 15, and flows into the main pipe of the circulation pipeline 20. Because of the presence of the first one-way valve 101 and the check valve 15, the water flow cannot flow back to the flow meter 11. The inlet valve 12 is connected in parallel with the first check valve 101 and the check valve 15. As a result, the clean water flowing through the flow meter 11 is divided into two paths: one path flows to the first check valve 101 and the other path flows to the inlet valve 12. After passing through the inlet valve 12, the water flows into the main pipe of the water replenishment pipe 10 and then into the circulation pipe 20. The accumulator 13 is connected to the main pipe of the water supply pipeline 10, located after the parallel structure of the first one-way valve 101, check valve 15, and inlet valve 12. A second one-way valve 102 is installed between the main pipe of the water supply pipeline 10 and the accumulator 13. The pressure gauge 14 is connected to the main pipe of the water supply pipeline 10, located after the accumulator 13, and is used to monitor the pressure of the sealing water inside the pipeline. The drain valve 16 is connected to the main pipe of the water supply pipeline 10, located between the pressure gauge 14 and the parallel structure formed by the first one-way valve 101, check valve 15, and inlet valve 12, and is used for draining wastewater during the maintenance of the water-saving device.

[0030] The main pipe of the circulation pipeline 20 includes a thermometer 21, a heat exchanger 22, an exhaust valve 23, a third check valve 201, and a fourth check valve 202. The heat exchanger 22 is located on the main pipe of the circulation pipeline 20, and external cooling water is connected to the CO and CI ports of the heat exchanger 22. The cooling water enters the heat exchanger 22 from the CI port and carries away heat from the CO port. The LBO and LBI ends of the sealing cavity 24 are connected to both ends of the heat exchanger, respectively. The LBI end of the sealing cavity 24 is connected to one end of the heat exchanger 22. A third check valve 201 is installed between the sealed cavity 24 and the other end of the heat exchanger 22. Similarly, a fourth check valve 202 is installed between the LBO end of the sealed cavity 24 and the other end of the heat exchanger 22. Thus, the clean water flowing from the makeup water pipe 10 into the circulation pipe 20 passes through the third check valve 201, enters the sealed cavity 24 from the LBI end of the sealed cavity 24 and flows out from the LBO end of the sealed cavity 24, then flows into the heat exchanger 22 through the fourth check valve 202, and finally flows from the heat exchanger 22 back to the third check valve 201, completing one cycle in the circulation pipe 20. A thermometer 21 is connected to the main pipe of the circulation pipe 20 and is located between the heat exchanger 22 and the third check valve 201 to monitor the temperature of the sealed water in the circulation pipe 20. An air vent valve 23 is connected to the main pipe of the circulation pipe 20 and is located between the heat exchanger 22 and the fourth check valve 202 to vent air from the pipe. The main pipe of the water supply line 10 is connected to the main pipe of the circulation line 20, with the connection point located between the thermometer 21 and the third check valve 201. Thus, the sealing water, carrying heat, flows out from the LBO end of the sealing cavity 24, passes through the fourth check valve 202, and enters the heat exchanger 22 for cooling. After cooling in the heat exchanger 22, the sealing water passes through the third check valve 201 and finally enters the sealing cavity 24 from the LBI end, continuously carrying away the heat generated inside the sealing cavity 24 and extending the service life of the mechanical seal. The sealing water is continuously circulated within the circulation line 20 without being discharged or consumed, thus saving a significant amount of sealing water. During normal operation, the mechanical seal may experience a small amount of leakage, and the water supply line 10 promptly replenishes the reduced pressure and water volume in the circulation line 20, ensuring that the mechanical seal operates under stable pressure and water volume, thereby reducing the consumption of sealing water.

[0031] After the mechanical seal water-saving device is installed, the air inside the water-saving device pipe needs to be vented before the equipment can operate normally. Therefore, the use of the water-saving device is divided into the venting stage and the operation stage. The two stages will be discussed in detail below.

[0032] like Figure 1As shown, during the venting stage of the water-saving device, a certain amount of clean water needs to be charged into the accumulator 13 and pressurized. Then, the inlet valve 12, the vent valve 23, and the valve at point S that directly connects to the external water source are opened. The external clean water enters the water supply pipeline 10 and, after passing through the flow meter 11, is divided into two paths. One path flows to the first one-way valve 101 and the check valve 15, while the other path flows to the inlet valve 12. After passing through the first one-way valve 101, the check valve 15, and the inlet valve 12, the two paths converge again and continue to flow. Because a second one-way valve 102 is installed between the accumulator 13 and the main pipeline of the water supply pipeline 10, the clean water can only flow from the accumulator 13 to the main pipeline of the water supply pipeline 10, and cannot enter the accumulator 13 from the main pipeline of the water supply pipeline 10 through the second one-way valve 102. Furthermore, the drain valve 16 is also closed, so the clean water can only continue to flow into the circulation pipeline 20. At the connection between the water supply line 10 and the circulation line 20, the clean water is split into two streams again. One stream flows through the heat exchanger 22 to the LBO port of the sealing cavity 24. Due to the presence of the fourth check valve 202, the clean water flowing from the heat exchanger 22 cannot flow into the LBO port of the sealing cavity 24 through the fourth check valve 202, but the clean water can squeeze the air in the pipe out through the vent valve 23. At the same time, the other stream of clean water flows through the third check valve 201 to the LBI port of the sealing cavity 24, and enters the interior of the sealing cavity 24 from the LBI port, and flows out from the LBO port of the sealing cavity 24. After passing through the fourth check valve 202, the remaining air in the pipe is squeezed out through the vent valve 23. When all the air in the pipe is discharged, the inlet valve 12 and the vent valve 23 are closed, while the valve at point S, which is directly connected to the external water source, remains open. Due to the presence of the check valve 15 and the first check valve 101, the clean water cannot flow back to the position of the flow meter 11, thus forming a high-pressure sealing environment for the normal operation of the mechanical seal. Thus, the clean water inside the pipe becomes sealing water.

[0033] During the operation of the water-saving device, the sealing water flows into the sealing cavity 24 from the LBI end under the operation of the pump and flows out from the LBO end. The sealing water flowing out from the LBO end carries away the heat generated in the sealing cavity 24 and flows into the heat exchanger 22 after passing through the fourth one-way valve 202. The external cooling water source connected to the CI port of the heat exchanger 22 flows out from the CO port. The flowing cooling water continuously cools and dissipates heat from the sealing water flowing into the heat exchanger 22. Then the sealing water flows out from the heat exchanger 22, passes through the third one-way valve 201, and enters the sealing cavity 24 from the LBI end, completing one cycle in the circulation pipeline. Because mechanical seals may leak slightly during normal operation, when the pressure and water volume in the pipeline decrease, the clean water stored in the accumulator 13 enters the main pipeline of the water supply pipeline 10 through the second one-way valve 102, and then replenishes the circulation pipeline 20. When the reduced pressure and water volume in the pipeline exceed the adjustment range of the accumulator 13, clean water from an external water source enters the main pipeline of the water supply pipeline 10. Since the inlet valve 12 is closed, the clean water flows through the flow meter 11, the first one-way valve 101, and the check valve 15 to the circulation pipeline 20, replenishing the sealing water in the circulation pipeline 20. This ensures that the sealing water is constantly circulated within the circulation pipeline 20, and also reduces pressure fluctuations within the sealing cavity 24, thus saving a significant amount of sealing water. In addition, this water-saving device also has advantages such as low cost and long service life, resulting in significant economic benefits.

[0034] The above embodiments are merely a more detailed description of the present utility model. For those skilled in the art, modifications or equivalent substitutions can still be made to the technical solutions in the foregoing embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model patent.

Claims

1. A mechanically sealed water saving device, characterized in that, The application relates to a water supply pipeline, one end of which is connected with an external water source; a circulating pipeline is connected with the other end of the water supply pipeline; a first one-way valve is arranged in the water supply pipeline; a heat exchanger, a third one-way valve and a fourth one-way valve are arranged in the circulating pipeline; two ends of the heat exchanger are respectively connected with LBO and LBI ends of a sealed cavity of a pump, the third one-way valve is arranged between the heat exchanger and the LBI end of the sealed cavity, and the fourth one-way valve is arranged between the heat exchanger and the LBO end of the sealed cavity. A check valve is arranged in the water supply pipeline, and the check valve is connected with the first one-way valve in series. A flowmeter is arranged in the water supply pipeline, one end of the flowmeter is connected with a valve of the external water source, and the other end of the flowmeter is connected with the first one-way valve. A water inlet valve is arranged in the water supply pipeline, and the water inlet valve is connected with a parallel pipeline of the first one-way valve and the check valve in series. An energy accumulator is connected with the water supply pipeline, the energy accumulator is arranged after a parallel structure formed by the first one-way valve, the check valve and the water inlet valve, and a second one-way valve is arranged between the energy accumulator and a main pipeline of the water supply pipeline.

2. The water saving device of claim 1, wherein: A pressure gauge is connected with the main pipeline of the water supply pipeline, and the pressure gauge is arranged after the energy accumulator.

3. The water saving device of claim 1, wherein: A blowdown valve is connected with the water supply pipeline, and the blowdown valve is arranged between the pressure gauge and a parallel structure formed by the first one-way valve, the check valve and the water inlet valve.

4. The water saving device of claim 2, wherein: A thermometer is connected with the circulating pipeline, and the thermometer is arranged between the heat exchanger and the third one-way valve.

5. The water saving device of claim 4, wherein: An exhaust valve is connected with the circulating pipeline, and the exhaust valve is arranged between the heat exchanger and the fourth one-way valve.

6. The water saving device of claim 5, wherein: ​ 7. The water saving device of claim 6, wherein: ​ 8. The water saving device of claim 1, wherein: ​ 9. The water saving device of claim 1, wherein: ​

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