Hydraulic sealing structure of boiler feed pump

Abstract

The utility model discloses a boiler feed pump hydraulic sealing structure, and particularly relates to the technical field of hydraulic sealing, which comprises a pump shaft, a pump cover sleeved on the outer side of the pump shaft, a shaft seal mounted at the joint of the pump cover and the pump shaft, a pressure relief component mounted in the pump cover, a water inlet pipe mounted on the pump cover and a water outlet pipe mounted on the water inlet pipe, a water return pipe is arranged on one side of the water inlet pipe, a pressure relief pipe is arranged on the other side of the water inlet pipe, an inner ring is arranged in one end of the pump cover, a plurality of bolt holes are formed in the inner ring and are annularly arranged, one end of the pressure relief assembly is fixedly connected with the bolt holes, the pressure relief assembly comprises a base plate, and the base plate and a sealing ring are jointly and slidably connected with a plurality of guide rods. A screw head is arranged at the end of each guide rod, each screw head penetrates through the corresponding bolt hole to be connected with a nut, and each guide rod is sleeved with a spring. The water feeding pump has the advantages that heat can be prevented from being conducted to the shaft seal, pressure can be automatically reduced, and the operation stability of the water feeding pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic seals, and more specifically, to a hydraulic seal structure for a boiler feed water pump. Background Technique

[0002] At present, mechanical seals are mostly used for feed water pumps in domestic power plants. However, due to the relatively complex internal structure and numerous components of mechanical seals, they are easily affected by impurities in the medium and installation accuracy, resulting in seal failure and affecting the normal operation of the unit.

[0003] The utility model patent with the patent announcement number CN201821189964.5 discloses a hydraulic seal structure for a boiler feed water pump. The composition of this utility model includes: a pump cover and a pump shaft. There is a gap of 0.3 - 0.4 mm between the pump cover and the pump shaft. The pump cover is respectively provided with two sealed water return ports and one sealed water inlet. The sealed water inlet is communicated with a water distribution cavity. The right side inside the pump cover has an inclined surface. The inner side of the pump cover and the outer side of the pump shaft are respectively provided with threaded grooves. This avoids the problem of high linear velocity friction when using a mechanical seal, avoids direct contact, improves operation safety, extends the service life of the pump, can effectively reduce the loss of water supply, and the rotating pump shaft and the stationary seal sleeve installed on the pump cover can prevent a large amount of high-temperature water from leaking outside the pump, thus preventing phenomena such as vaporization or flashing.

[0004] However, during actual use of this structure, it is not able to effectively reduce the temperature of the sealed water. As a result, during long-term operation, the high-temperature water generated will transfer heat to the bearing through the rotating shaft of the pump, causing the bearing temperature to rise, resulting in friction between the shaft and the seal, increasing the vibration of the water pump, and easily damaging the equipment. Therefore, a hydraulic seal structure for a boiler feed water pump is now proposed. Summary of the Utility Model

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a hydraulic seal structure for a boiler feed water pump to solve the problems raised in the above background technique.

[0006] To achieve the above object, the utility model provides the following technical solution: A hydraulic seal structure for a boiler feed water pump, including a pump shaft, a pump cover is sleeved outside the pump shaft, a shaft seal is installed at the connection between the pump cover and the pump shaft, a pressure relief component is installed inside the pump cover, one end of the pressure relief component is slidably connected to the pump shaft, a water inlet pipe is installed on the pump cover, a return water pipe is arranged on one side of the water inlet pipe, and a pressure relief pipe is arranged on the other side of the water inlet pipe.

[0007] Preferably, an inner ring is arranged inside one end of the pump cover, a plurality of bolt holes are formed in the inner ring, the plurality of bolt holes are arranged in a ring shape, and one end of the pressure relief component is connected and fixed to each bolt hole.

[0008] Preferably, the pressure relief component includes a backing plate, a sealing ring, guide rods, screw heads, nuts and springs. One side of the backing plate is attached with a sealing ring. The backing plate and the sealing ring are jointly and slidably connected with a plurality of guide rods. Screw heads are arranged at the ends of the guide rods. The screw heads respectively penetrate through the corresponding bolt holes and are connected with nuts. Springs are sleeved on the guide rods.

[0009] Preferably, two water distribution grooves are formed in the inner wall of the pump cover, and the water distribution grooves are respectively communicated with the water inlet pipe and the water return pipe.

[0010] Preferably, the water inlet pipe is connected with a water pump, and the water pump is connected with a condenser.

[0011] Preferably, the condenser is connected with a water return tank, and the water return tank is connected with the water return pipe and the pressure relief pipe.

[0012] The technical effects and advantages of the present utility model:

[0013] By connecting and fixing one end of the pressure relief component with the inner ring, when the other end of the pressure relief component is under the action of water pressure, it can generate a moving compression. Thus, when the compressed end of the pressure relief component moves to the other side of the pressure relief pipe, the pressure relief pipe can discharge the high-pressure sealed water, thereby achieving pressure relief and having a pressure stabilizing effect. At the same time, it also has an isolation effect between the shaft seal and the high-temperature water.

[0014] When the water pressure in the gap between the pump shaft and the pump cover is too high, it will exert a thrust on the sealing ring. Under the support of the backing plate, each guide rod guides the backing plate, and the spring is compressed, causing the sealing position of the sealing ring to change. Thus, the pressure relief pipe can be communicated with the gap between the pump shaft and the pump cover, and then pressure relief drainage can be carried out to ensure the stability of the water pressure.

[0015] By the operation of the water pump, the sealed water in the water return tank is pumped, cooled by the condenser, and then conveyed from the water inlet pipe to the gap between the pump shaft and the pump cover to be mixed with the high-temperature water to cool the high-temperature water. Then, it flows back to the water return tank through the water return pipe for cyclic use. When the water pressure in the gap between the pump shaft and the pump cover is too high, the sealed water is discharged from the pressure relief pipe under the compression of the pressure relief component for automatic pressure relief to ensure the stability of the water pressure. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0017] Figure 2 It is a schematic diagram of the overall sectional structure of the present utility model.

[0018] Figure 3 It is a schematic diagram of the sectional structure of the pump cover of the present utility model.

[0019] Figure 4 This is a schematic structural diagram of the pressure relief component of the present utility model.

[0020] The reference numerals in the drawings are: 1, pump shaft; 2, pump cover; 3, shaft seal; 4, water inlet pipe; 5, water return pipe; 6, pressure relief pipe; 7, inner ring; 8, pressure relief component; 801, backing plate; 802, sealing ring; 803, guide rod; 804, screw head; 805, nut; 806, spring; 9, water distribution tank. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] As shown in the attached Figures 1-4 A hydraulic seal structure of a boiler feed pump is shown, including a pump shaft 1, a pump cover 2 is sleeved outside the pump shaft 1, a shaft seal 3 is installed at the connection between the pump cover 2 and the pump shaft 1, a pressure relief component 8 is installed inside the pump cover 2, one end of the pressure relief component 8 is slidably connected to the pump shaft 1, a water inlet pipe 4 is installed on the pump cover 2, a water return pipe 5 is arranged on one side of the water inlet pipe 4, and a pressure relief pipe 6 is arranged on the other side of the water inlet pipe 4.

[0023] During specific implementation, cooled sealing water is input from the water inlet pipe 4 into the gap between the pump shaft 1 and the pump cover 2, and is mixed with the high-temperature water entering along the pump shaft 1 of the feed pump for cooling, reducing the temperature of the pump shaft 1, thereby reducing the heat conduction to the shaft seal 3, avoiding thermal expansion and contraction, enabling the stable rotation of the pump shaft 1 and the shaft seal 3, avoiding friction, and improving the operating stability of the feed pump. The entered sealing water is evenly dispersed under the distribution of the water distribution tank 9 and flows back into the water return tank from the water return pipe 5, and then is recycled through condensation again in cooperation with the water pump and the condenser. When the water pressure between the pump shaft 1 and the pump cover 2 is too high, the water pressure pushes one end of the pressure relief component 8, causing the pressure relief component 8 to compress, so that the pressure relief pipe 6 is communicated with the water distribution tank 9, thereby discharging pressure to avoid excessive water pressure between the pump shaft 1 and the pump cover 2 and improving the sealing stability. At the same time, the high-temperature water is isolated from the shaft seal 3 through the pressure relief component 8, thereby further reducing the direct conduction of heat in the high-temperature water to the shaft seal 3, and further improving the operating stability of the feed pump.

[0024] One end inside the pump cover 2 is provided with an inner ring 7, and a plurality of bolt holes are formed in the inner ring 7. The plurality of bolt holes are arranged in a ring shape, and one end of the pressure relief component 8 is connected and fixed to each bolt hole.

[0025] During specific implementation, one end of the pressure relief component 8 is fixedly connected to the inner ring 7. When the other end of the pressure relief component 8 is under the action of water pressure, it can generate a moving compression. Thus, when the compressed end of the pressure relief component 8 moves to the other side of the pressure relief pipe 6, the pressure relief pipe 6 can discharge the high-pressure sealed water, thereby relieving pressure and having a pressure stabilizing effect. At the same time, it also has an isolation effect between the shaft seal 3 and the high-temperature water.

[0026] The pressure relief component 8 includes a backing plate 801, a sealing ring 802, guide rods 803, screw heads 804, nuts 805, and springs 806. One side of the backing plate 801 is fitted with a sealing ring 802. The backing plate 801 and the sealing ring 802 are jointly slidably connected with a plurality of guide rods 803. Screw heads 804 are provided at the ends of the respective guide rods 803. The respective screw heads 804 are respectively connected to the nuts 805 through corresponding bolt holes, and springs 806 are sleeved on the respective guide rods 803.

[0027] During specific implementation, when the water pressure in the gap between the pump shaft 1 and the pump cover 2 is too high, it will exert a thrust on the sealing ring 802. Supported by the backing plate 801, the respective guide rods 803 guide the backing plate 801, causing the springs 806 to be compressed and changing the sealing position of the sealing ring 802. Thus, the pressure relief pipe 6 can be communicated with the gap between the pump shaft 1 and the pump cover 2, enabling pressure relief and drainage to ensure the stability of the water pressure.

[0028] Two water distribution grooves 9 are formed in the inner wall of the pump cover 2, and the respective water distribution grooves 9 are communicated with the water inlet pipe 4 and the water return pipe 5 respectively.

[0029] The water inlet pipe 4 is connected to a water pump, and the water pump is connected to a condenser.

[0030] The condenser is connected to a water return tank, and the water return tank is connected to the water return pipe 5 and the pressure relief pipe 6.

[0031] During specific implementation, through the operation of the water pump, the sealed water in the water return tank is pumped, cooled by the condenser, and then transported from the water inlet pipe 4 to the gap between the pump shaft 1 and the pump cover 2 to be mixed with the high-temperature water to cool the high-temperature water. Then, it flows back to the water return tank through the water return pipe 5 for recycling. When the water pressure in the gap between the pump shaft 1 and the pump cover 2 is too high, the sealed water is automatically discharged from the pressure relief pipe 6 under the compression of the pressure relief component 8 to ensure the stability of the water pressure.

[0032] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic seal structure for a boiler feed pump, comprising a pump shaft (1), characterized in that: A pump cover (2) is sleeved outside the pump shaft (1). A shaft seal (3) is installed at the connection between the pump cover (2) and the pump shaft (1). A pressure relief component (8) is installed inside the pump cover (2). One end of the pressure relief component (8) is slidably connected to the pump shaft (1). A water inlet pipe (4) is installed on the pump cover (2). A water return pipe (5) is arranged on one side of the water inlet pipe (4), and a pressure relief pipe (6) is arranged on the other side of the water inlet pipe (4).

2. The hydraulic seal structure of a boiler feed pump according to claim 1, characterized in that: An inner ring (7) is arranged inside one end of the pump cover (2). A plurality of bolt holes are formed in the inner ring (7). The plurality of bolt holes are arranged in a ring shape, and one end of the pressure relief component (8) is fixedly connected to each bolt hole.

3. The hydraulic seal structure of a boiler feed pump according to claim 2, characterized in that: The pressure relief component (8) includes a backing plate (801), a sealing ring (802), a guide rod (803), a screw head (804), a nut (805) and a spring (806). A sealing ring (802) is attached to one side of the backing plate (801). The backing plate (801) and the sealing ring (802) are jointly slidably connected with a plurality of guide rods (803). Screw heads (804) are arranged at the ends of the guide rods (803). The screw heads (804) respectively pass through the corresponding bolt holes and are connected to the nuts (805). Springs (806) are sleeved on the guide rods (803).

4. A hydraulic seal structure of a boiler feed pump according to claim 3, characterized in that: Two water distribution grooves (9) are formed in the inner wall of the pump cover (2). The water distribution grooves (9) are respectively communicated with the water inlet pipe (4) and the water return pipe (5).

5. The hydraulic seal structure of a boiler feed pump according to claim 4, characterized in that: The water inlet pipe (4) is connected to a water pump, and the water pump is connected to a condenser.

6. A hydraulic seal structure of a boiler feed pump according to claim 5, characterized in that: The condenser is connected to a water return tank, and the water return tank is connected to the water return pipe (5) and the pressure relief pipe (6).

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