Pressure regulating device for double mechanical seal isolation chamber in water pump

Abstract

The present invention relates to the field of self-priming pumps, and specifically to a pressure regulating device for a double-ended mechanical seal isolation chamber in a water pump, which includes a pressure regulating valve and a pressure regulating box. The pressure regulating box has a double-layer structure, with the upper layer being an oil storage tank and the lower layer being a water storage tank. The oil storage tank and the water storage tank are connected through a gas connection pipe. The upper pipe orifice of the gas connection pipe is above the oil surface in the oil storage tank, and the lower pipe orifice of the gas connection pipe is above the water surface in the water storage tank. The oil storage tank is connected to the double-ended mechanical seal isolation chamber through an oil delivery pipe, the water storage tank is connected to the outlet of the pressure regulating valve through a water delivery pipe, the inlet of the pressure regulating valve is connected to the water pressure chamber of the water pump through a water inlet pipe, and the overflow port of the pressure regulating valve is connected to the water suction chamber of the water pump through a water outlet pipe. This enables the double-ended mechanical seal to operate under positive pressure, fills the double-ended mechanical seal isolation chamber with mechanical oil, and keeps both mechanical seal friction surfaces of the double-ended mechanical seal in an oil lubrication state, greatly extending the service life of the mechanical seal.

Description

Technical Field

[0001] The present invention relates to the technical field of self-priming pumps, and particularly to a pressure regulating device for a double-end mechanical seal isolation chamber in a water pump. Background Art

[0002] Currently, in the double-end mechanical seal isolation chamber, the double-end mechanical seal inside is lubricated by introducing mechanical seal flushing water; the mechanical seal flushing water enters from one side of the double-end mechanical seal isolation chamber and flows out from the other side, resulting in a large amount of waste of water resources; moreover, if the pressure of the mechanical seal flushing water is unstable, it may cause the pressure in the double-end mechanical seal isolation chamber to be lower than the pressure in the pump chamber. In this case, the liquid in the pump chamber will gradually seep into the double-end mechanical seal isolation chamber, causing the inner mechanical seal friction surface of the double-end mechanical seal to be lubricated by the liquid in the pump chamber. If there are solid particles in the liquid in the pump chamber, the solid particles entering the inner mechanical seal friction surface will cause the mechanical seal to fail quickly and reduce the service life of the mechanical seal. Summary of the Invention

[0003] In view of the above problems, an embodiment of the present invention provides a pressure regulating device for a double-end mechanical seal isolation chamber in a water pump.

[0004] On the one hand, an embodiment of the present invention provides a pressure regulating device for a double-end mechanical seal isolation chamber in a water pump, including a pressure regulating valve and a pressure regulating tank. The pressure regulating tank has a double-layer structure, with the upper layer being an oil storage tank and the lower layer being a water storage tank. The oil storage tank and the water storage tank are connected through a gas connection pipe. The upper pipe orifice of the gas connection pipe is located above the oil level in the oil storage tank, and the lower pipe orifice of the gas connection pipe is located above the water level in the water storage tank. The oil storage tank is connected to the double-end mechanical seal isolation chamber through an oil delivery pipe, the water storage tank is connected to the outlet of the pressure regulating valve through a water delivery pipe, the inlet of the pressure regulating valve is connected to the pressure water chamber of the water pump through a water inlet pipe, and the overflow port of the pressure regulating valve is connected to the suction chamber of the water pump through a water outlet pipe.

[0005] Compared with the prior art, the beneficial effects of the present invention are as follows: During the operation of the water pump, the opening degree of the pressure regulating valve is adjusted by using the pressure difference between the pressure water chamber (high-pressure area) and the suction chamber (low-pressure area) in the water pump, so that the pressure in the pressure regulating tank increases. Since the double-end mechanical seal isolation chamber is connected to the pressure regulating tank and the two maintain the same pressure, the pressure requirement in the double-end mechanical seal isolation chamber is met, enabling the double-end mechanical seal to be in a positive pressure working state. The double-end mechanical seal isolation chamber is filled with mechanical oil, and both mechanical seal friction surfaces of the double-end mechanical seal are in an oil lubrication state, greatly extending the service life of the mechanical seal.

[0006] Optionally, a ball valve is installed on the water delivery pipe.

[0007] Optionally, partitions are arranged at intervals and staggered on the top and bottom surfaces of the water storage tank.

[0008] Optionally, a sewage discharge valve is installed on the bottom surface of the water storage tank.

[0009] Optionally, an oil level gauge is installed on the oil storage tank.

[0010] Optionally, a pump seal cavity formed between the outer side of the double-ended mechanical seal isolation cavity and the pump body is communicated with the water pressure chamber through a cooling water pipe. Description of the Drawings

[0011] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and do not limit the present invention. In the drawings:

[0012] Figure 1 It is a schematic structural diagram of a pressure regulating device for a double-ended mechanical seal isolation cavity in a water pump provided by an embodiment of the present invention.

[0013] Among them, pressure regulating valve 1, pressure regulating box 2, oil storage tank 3, water storage tank 4, gas connection pipe 5, double-ended mechanical seal isolation cavity 6, oil delivery pipe 7, water delivery pipe 8, water pressure chamber 9, water inlet pipe 10, water suction chamber 11, water outlet pipe 12, ball valve 13, partition plate 14, pump seal cavity 15, cooling water pipe 16. Detailed Embodiments

[0014] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. Herein, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0015] See Figure 1 , a pressure regulating device for a double-ended mechanical seal isolation cavity in a water pump provided by an embodiment of the present invention includes a pressure regulating valve 1 and a pressure regulating box 2. The pressure regulating box 2 has a double-layer structure, with an upper layer being an oil storage tank 3 and a lower layer being a water storage tank 4. The oil storage tank 3 and the water storage tank 4 are communicated through a gas connection pipe 5. The upper pipe orifice of the gas connection pipe 5 is above the oil surface in the oil storage tank 3, and the lower pipe orifice of the gas connection pipe 5 is above the water surface in the water storage tank 4. The oil storage tank 3 is communicated with the double-ended mechanical seal isolation cavity 6 through an oil delivery pipe 7. The water storage tank 4 is communicated with the outlet of the pressure regulating valve 1 through a water delivery pipe 8. The inlet of the pressure regulating valve 1 is communicated with the water pressure chamber 9 of the water pump through a water inlet pipe 10. The overflow port of the pressure regulating valve 1 is communicated with the water suction chamber 11 of the water pump through a water outlet pipe 12.

[0016] In implementation, the pressure regulating valve 1 is a patented product with the application number 2007201480425; a ball valve 13 is installed on the water delivery pipe 8; when the oil storage tank 3 is short of oil, the ball valve 13 can be closed, and after adding mechanical oil to the oil storage tank 3, the ball valve 13 is opened to prevent the water in the water storage tank 4 from spraying out through the gas connection pipe 5 when adding mechanical oil during the operation of the water pump.

[0017] Partition plates 14 are arranged at intervals and staggered on the top and bottom surfaces of the water storage tank 4, and a water path is formed between the partition plates 14 to enhance the sedimentation effect.

[0018] A sewage valve is installed on the bottom surface of the water storage tank 4.

[0019] An oil level gauge is installed on the oil storage tank 3.

[0020] A pump seal cavity 15 formed between the outer side of the double-end mechanical seal isolation cavity 6 and the pump body communicates with the water pressure chamber 9 through a cooling water pipe 16 to ensure cooling inside the double-end mechanical seal isolation cavity 6.

[0021] During the operation of the water pump, the opening degree of the pressure regulating valve 1 is adjusted by using the pressure difference between the water pressure chamber 9 (high-pressure area) and the water suction chamber 11 (low-pressure area) inside the water pump, so that the pressure inside the pressure regulating box 2 increases. Since the double-end mechanical seal isolation cavity 6 communicates with the pressure regulating box 2 and the two maintain the same pressure, the pressure requirement inside the double-end mechanical seal isolation cavity 6 is met, enabling the double-end mechanical seal to be in a positive pressure working state. The double-end mechanical seal isolation cavity 6 is filled with mechanical oil, and both mechanical seal friction surfaces of the double-end mechanical seal are in an oil lubrication state, greatly extending the service life of the mechanical seal.

[0022] During the long-term operation of the water pump, the mechanical oil inside the double-end mechanical seal isolation cavity 6 will slowly leak into the water pump, the oil level in the oil storage tank gradually drops, and the water level in the water storage tank gradually rises to ensure the pressure inside the double-end mechanical seal isolation cavity; when the oil level drops significantly, the ball valve 13 can be closed, and after adding mechanical oil to the oil storage tank 3, the ball valve 13 is opened;

[0023] In addition, the proportional relationship between the volumes of the water storage tank 4 and the oil storage tank 3 can be designed so that when the oil level in the oil storage tank 3 drops to the upper side of the oil delivery pipe 7, the water in the water storage tank 4 enters the oil storage tank 3. In this case, even if mechanical oil is not added to the oil storage tank 3, water lubrication of the double-end mechanical seal can be achieved later;

[0024] Moreover, under normal circumstances, the leakage of mechanical oil inside the double-end mechanical seal isolation cavity 6 is very small, so the water flow rate in the water storage tank 4 is very small and the flow velocity is extremely low, with good sedimentation effect. The sedimented water is relatively clean, enabling the double-end mechanical seal to work under clean water lubrication later and ensuring its service life.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A pressure regulating device for the double - end mechanical seal isolation chamber in a water pump, including a pressure regulating valve, characterized in that, It also includes a pressure regulating tank, which has a double-layer structure with an upper layer for an oil storage tank and a lower layer for a water storage tank. The oil storage tank and the water storage tank are connected through a gas connecting pipe. The upper pipe orifice of the gas connecting pipe is located above the oil level in the oil storage tank, and the lower pipe orifice of the gas connecting pipe is located above the water level in the water storage tank. The oil storage tank is connected to the double-end mechanical seal isolation cavity through an oil delivery pipe. The water storage tank is connected to the outlet of the pressure regulating valve through a water delivery pipe. The inlet of the pressure regulating valve is connected to the pressure water chamber of the water pump through a water inlet pipe. The overflow port of the pressure regulating valve is connected to the suction chamber of the water pump through a water outlet pipe. During the operation of the water pump, the opening degree of the pressure regulating valve is adjusted by using the pressure difference between the pressure water chamber and the suction chamber in the water pump, so that the pressure in the pressure regulating tank increases. Since the double-end mechanical seal isolation cavity is connected to the pressure regulating tank and the two maintain the same pressure, the pressure requirement in the double-end mechanical seal isolation cavity is met, enabling the double-end mechanical seal to be in a positive pressure working state. The double-end mechanical seal isolation cavity is filled with mechanical oil, and both mechanical seal friction surfaces of the double-end mechanical seal are in an oil lubrication state, extending the service life of the mechanical seal. During the long-term operation of the water pump, the mechanical oil in the double-end mechanical seal isolation cavity will slowly leak into the water pump. The oil level in the oil storage tank gradually drops, and the water level in the water storage tank gradually rises to ensure the pressure in the double-end mechanical seal isolation cavity. When the oil level drops significantly, close the ball valve, add mechanical oil to the oil storage tank, and then open the ball valve. In addition, the proportional relationship between the volumes of the water storage tank and the oil storage tank can be designed so that when the oil level in the oil storage tank drops to the upper side of the oil delivery pipe, the water in the water storage tank enters the oil storage tank. In this case, even if mechanical oil is not added to the oil storage tank, water lubrication of the double-end mechanical seal can be achieved later. Moreover, the water settled in the water storage tank is relatively clean, enabling the double-end mechanical seal to work under clean water lubrication later, ensuring its service life.

2. The pressure regulating device for the double - end mechanical seal isolation chamber in a water pump according to claim 1, characterized in that, A ball valve is installed on the water delivery pipe.

3. The pressure regulating device for the double - end mechanical seal isolation chamber in a water pump according to claim 1, characterized in that, Partition plates are arranged at intervals and staggered on the top and bottom surfaces of the water storage tank.

4. The pressure regulating device for the double - end mechanical seal isolation chamber in a water pump according to claim 1, characterized in that, A sewage valve is installed on the bottom surface of the water storage tank.

5. The pressure regulating device for the double - end mechanical seal isolation chamber in a water pump according to claim 1, characterized in that, An oil level gauge is installed on the oil storage tank.

6. The pressure regulating device for the double - end mechanical seal isolation chamber in a water pump according to claim 1, characterized in that, The pump seal cavity formed between the outside of the double-end mechanical seal isolation cavity and the pump body is connected to the pressure water chamber through a cooling water pipe.

Images