A new type of bulb through-flow pump semi-enclosed sealing device and its sealing method

Abstract

The present invention relates to a novel semi-enclosed sealing device for a bulb-type tubular pump and a sealing method thereof. The sealing device is composed of three parts: an outer cladding, an inner cladding, and a circular sphere. The outer cladding and the inner cladding are tightly connected, and both are annular pipes. The outer cladding is made of polytetrafluoroethylene, and the inner cladding is made of stainless steel. The inner cladding is placed inside the outer cladding, and the inner wall of the outer cladding is tightly connected to the outer wall of the inner cladding. The circular sphere is placed inside the inner cladding. A number of evenly distributed grooves are opened on the outer cladding, and each groove passes through the inner cladding wall of the inner cladding and is connected to the inner cladding. This device can solve the problems of aging and extrusion damage of the sealing ring and reasonably extend the service life of the sealing ring. The use of a semi-enclosed sealing ring improves the sealing performance and stability of the sealing ring, reduces the problem of low efficiency of the pump station due to damage to the pump body, and can effectively avoid the problem of bearing oil and water leakage due to aging and failure of the sealing facility.

Description

TECHNICAL FIELD

[0001] The present application relates to a new type of bulb through-flow pump semi-enclosed sealing device and its sealing method, belonging to the technical field of water conservancy and municipal engineering. BACKGROUND

[0002] The flow channel of the bulb through-flow pump device is straight, and compared with other device forms, it has the advantages of small hydraulic loss and high device efficiency. However, due to the complex structure of the bulb through-flow pump, there are many types of faults and complex fault causes, and the experience of pump station operation and maintenance personnel in the use and management of the bulb through-flow pump still needs to be improved, which leads to the fact that the bulb through-flow pump is the most complex pump type among through-flow pumps. Although many faults do not cause serious consequences, they should still be paid enough attention by pump station operation and maintenance personnel. The pump shaft bearing fault of the bulb through-flow pump unit is the most common type of fault, and the reasons are mainly bearing oil shortage, oil leakage, aging damage of the sealing ring, etc. In the existing practical pump station, it is found that the water enters the blade adjustment system, the sealing groove fails, causing the oil in the inner and outer cavities of the servomotor to be discharged and a large amount of water to be leaked, and the inner wall of the outer cavity of the servomotor is severely corroded; the river water flows into the unit, the shaft seal leaks a large amount of water, the existing drainage pipeline cannot normally collect water, the water leaks from the bulb body to the ground, and seriously affects the safe operation of the pump station unit.

[0003] In order to reduce the phenomenon of bearing water leakage, oil leakage and sealing failure of the through-flow pump, there are related patents involving related measures at present: the authorized application for invention patent CN202121509442.0 proposes a large submersible through-flow pump sealing device including a sealing segment, a first flange, a second flange, a positioning ring, a sealing ring, a liquid guide body and a steel ring; by setting the sealing segment as a complete ring, the sealing structure is reduced, thereby improving the sealing performance and the convenience of sealing operation; the mutual compression of the first flange and the second flange is realized by bolt connection, so that the sealing ring blocks the gap between the positioning ring and the first flange, which can effectively prevent water leakage. The invention patent mainly proposes a design and development scheme suitable for the mechanical connection sealing of the submersible through-flow pump, but does not involve the related problems of bearing sealing ring damage of the bulb through-flow pump. The authorized application for invention patent CN201020255285.0 proposes that there is a mechanical seal on the outer side surface of the bearing seat, three skeleton oil seals are arranged in the mechanical seal, and a J-shaped sealing ring is embedded on the outer side of the mechanical seal. The advantage of this invention is that the improved oil guide bearing sealing can effectively prevent the oil in the bearing from flowing into the water, and can effectively prevent water and sand from entering the oil guide bearing, which reasonably solves the problem of bearing oil leakage, but cannot solve the problem of sealing ring aging and damage repair.

[0004] The existing patents mainly improve the bearing oil leakage and water leakage problems by changing the structure of the sealing device, but there is no patent disclosure on the way to extend the service life of the sealing ring in the case of sudden aging and damage of the sealing ring. SUMMARY

[0005] The application aims at solving the problems of the prior art, and provides a novel bulb through-flow pump semi-enclosed sealing device and a sealing method thereof, which can improve the bearing oil leakage, water leakage and aging of the sealing ring, and prolong the service life of the bearing sealing.

[0006] In order to achieve the above-mentioned application purposes, the technical scheme adopted by the application is as follows: a novel bulb through-flow pump semi-enclosed sealing device, characterized in that: the sealing device is composed of three parts from outside to inside, i.e., an outer cladding layer, an inner cladding layer and a spherical ball.

[0007] The outer cladding layer and the inner cladding layer are in close contact, and both of them are circular annular pipes; the material of the outer cladding layer is polytetrafluoroethylene material, and the material of the inner cladding layer is stainless steel material; the inner cladding layer is arranged in the outer cladding layer, and the inner wall of the outer cladding layer is in close contact with the outer wall of the inner cladding layer; the spherical ball is arranged in the inner cladding layer.

[0008] A plurality of grooves are formed on the outer cladding layer, and each groove penetrates the inner cladding layer wall of the inner cladding layer and is in communication with the inner cladding layer.

[0009] The number of the grooves is three.

[0010] The grooves are semi-enclosed, the cross section is semicircular, and the outer cladding layer and the inner cladding layer have the same groove position; the diameter of the spherical ball is slightly smaller than the inner diameter of the inner cladding layer, and the spherical ball can freely move in the inner cladding layer.

[0011] D is the inner diameter of the stainless steel inner cladding layer, d is the diameter of the spherical ball, and L is the width of the grooving part, i.e., the groove width; then:

[0012] D=2d;

[0013] R1 is the thickness of the polytetrafluoroethylene outer cladding layer, and R2 is the thickness of the stainless steel inner cladding layer; then:

[0014] R1=R2; R1=0.2d; R2=0.2d.

[0015] A new type of bulb through-flow pump semi-enclosed sealing device sealing method, the sealing device is installed in the bulb through-flow pump device, the sealing device is installed in the bulb through-flow pump device, specifically, the bulb through-flow pump device comprises a bulb body and a motor installed in the bulb body, one end of the water-facing surface of the bulb body is provided with a rotating shaft extension hole, a guide bearing is fixedly installed on the rotating shaft extension hole, the power output shaft of the motor penetrates the guide bearing, and the rotating shaft at one end of the penetrating guide bearing is provided with an impeller; during installation, the sealing device is arranged between the rotating shaft of the motor and the inner ring of the guide bearing, the outer wall of the outer layer of the sealing device is sealingly and fixedly connected with the inner wall of the guide bearing, and the inner wall of the outer layer of the sealing device is sealingly and fixedly connected with the rotating shaft of the motor; during use, the motor is started, and the rotating shaft of the motor can rotate in the guide bearing; under the action of the sealing device, external water flow into the bulb body is avoided.

[0016] After working underwater for a period of time, the water around the sealing device can seep into the inner layer through the slots, and under the action of external water pressure, the circular ball in the inner layer moves in the inner layer, which can reduce the external water pressure and prolong the service life of the sealing device, and on the other hand, when the external water pressure is uniform and the water enters the inner layer of the sealing device from several slotted parts, the circular ball rotates under the action of uniform water pressure; when the water pressure of the several slotted parts is not uniform, the circular ball will move from the high-pressure slot to the low-pressure slot under the action of uneven water pressure, thereby balancing the water pressure and avoiding the extrusion damage of the sealing device caused by uneven water pressure.

[0017] The present application has the advantages of simple structure, easy production and manufacturing, and convenient use, and provides a new type of bulb through-flow pump semi-enclosed sealing device and a sealing method thereof, which adopts a new type of semi-enclosed pipe sealing device to effectively solve the problems of bearing oil leakage and water leakage caused by aging damage of the sealing ring and improve the service life of the bearing sealing.

[0018] The device is a new type of semi-enclosed pipe sealing device, which comprises an outer layer, an inner layer and an internal ball from the outside to the inside. The outer layer and the inner layer are tightly connected, and the outer layer and the inner layer are both circular annular pipes. The outer layer is made of polytetrafluoroethylene material, and the inner layer is made of stainless steel material. The outer surface of the inner layer and the outer layer is slotted, the number of slots is 3, the slot part is semi-enclosed, the cross section is semicircular, and the slot positions of the outer layer and the inner layer are consistent. The circular ball is wrapped in the inner layer, and the circular ball is made of polytetrafluoroethylene material. The diameter of the circular ball is consistent with the inner diameter of the inner layer, and the circular ball can freely move in the inner layer.

[0019] Generally, the ordinary sealing ring will be corroded and aged after working underwater for a period of time, and will begin to appear the phenomenon of sealing and water seepage under the action of larger water pressure. The sealing device of the patent is provided with three semicircular grooves, and the water around the sealing device can seep into the inner layer through the grooved parts. Under the action of external water pressure, the circular ball in the inner layer moves in the inner layer, which can reduce the external water pressure and prolong the service life of the sealing device. On the other hand, when the external water pressure is uniform and enters the sealing device from the three grooved parts, the ball rotates under the action of uniform water pressure; when the water pressure of the three grooved parts is inconsistent, the ball will move from the high-pressure groove to the low-pressure groove under the action of uneven water pressure, thereby balancing the water pressure and avoiding the extrusion damage of the sealing device caused by uneven water pressure.

[0020] Beneficial effects: The device can solve the problems of aging and extrusion damage of the sealing ring, reasonably prolong the service life of the sealing ring, improve the sealing and stability of the sealing ring by using the semi-packaged sealing ring, reduce the working problems caused by low efficiency of the pump station due to damage of the pump body, effectively avoid the problems of bearing oil and water leakage caused by aging and failure of the sealing device, and improve the economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure diagram of the bulb tubular pump adopting the semi-packaged sealing device of the new bulb tubular pump.

[0022] Figure 2 It is a structure diagram of the semi-packaged sealing device of the new bulb tubular pump.

[0023] Figure 3 It is another direction structure diagram of the semi-packaged sealing device of the new bulb tubular pump.

[0024] Figure 4 It is a structure cross-sectional view of the semi-packaged sealing device of the new bulb tubular pump.

[0025] In the figure: 1 outer layer, 2 inner layer, 3 circular ball, 4 groove, 5 sealing device, 6 impeller, 7 guide vane. DETAILED DESCRIPTION

[0026] The application will be further described in detail in combination with the drawings and the description of the drawings.

[0027] A semi-packaged sealing device of a new bulb tubular pump, the sealing device is composed of three parts from outside to inside, i.e. an outer layer 1, an inner layer 2 and a circular ball 3; wherein the outer layer 1 and the inner layer 2 are tightly connected, the outer layer 1 and the inner layer 2 are both circular ring pipes, the material of the outer layer 1 is polytetrafluoroethylene material, and the material of the inner layer 2 is stainless steel material; the inner layer 2 is placed in the outer layer 1, and the inner wall of the outer layer 1 and the outer wall of the inner layer 2 are tightly connected; the circular ball 3 is placed in the inner layer 2.

[0028] The outer layer 1 is provided with a plurality of grooves 4, each of which penetrates the inner layer wall of the inner layer 2 and the inner layer 2.

[0029] Further, the number of grooves 4 is 3, the grooves 4 are half-enclosed, the cross section is semicircular, and the outer layer 1 and the inner layer 2 are consistent in the groove position. The diameter of the spherical ball 3 is slightly smaller than the inner diameter of the inner layer 2, and the spherical ball 3 can freely move in the inner layer 2. Let D be the inner diameter of the stainless steel inner layer, d be the diameter of the small ball, and L be the width of the grooving part, that is, the groove width of the groove 4. Then:

[0030] D = 2d;

[0031] Let R1 be the thickness of the polytetrafluoroethylene outer layer, and R2 be the thickness of the stainless steel inner layer. Then:

[0032] R1 = R2; R1 = 0.2d; R2 = 0.2d.

[0033] In use, the sealing device is installed in the bulb through-flow pump device. Specifically, the bulb through-flow pump device is a commonly used existing bulb through-flow pump device. The bulb through-flow pump device includes a bulb body and a motor installed in the bulb body. The water-facing end of the bulb body is provided with a rotating shaft extension hole. A guide bearing is fixedly installed on the rotating shaft extension hole. The power output shaft of the motor penetrates the guide bearing, and the rotating shaft at one end of the penetrating guide bearing is installed with an impeller. During installation, the sealing device is placed between the rotating shaft of the motor and the inner ring of the guide bearing. The outer wall of the outer layer 1 of the sealing device is sealingly and fixedly connected with the inner wall of the guide bearing, and the inner wall of the outer layer 1 of the sealing device is sealingly and fixedly connected with the rotating shaft of the motor. In use, the motor is started, and the rotating shaft of the motor can rotate in the guide bearing. Under the action of the sealing device, external water flow into the bulb body is avoided.

[0034] After working underwater for a period of time, the water around the sealing device can penetrate into the inner layer 2 through the grooves 4. Under the action of external water pressure, the spherical ball 3 in the inner layer 2 moves, which can reduce the external water pressure and prolong the service life of the sealing device. On the other hand, when the external water pressure is uniform and enters the inner layer 2 of the sealing device from a plurality of grooving parts, the spherical ball 3 rotates under the action of uniform water pressure. When the water pressure at the plurality of grooving parts is inconsistent, the spherical ball 3 moves from the high-pressure groove to the low-pressure groove under the action of uneven water pressure, thereby balancing the water pressure and avoiding the extrusion damage of the sealing device caused by uneven water pressure.

[0035] During installation, the spherical ball is first installed in the inner layer, and then the whole is assembled. During installation, the sealing device 5 is provided with one set on the water inlet and outlet sides of the impeller 6.

Claims

1. A novel sealing method for a semi-enclosed sealing device of a bulb tubular pump, comprising a sealing device, characterized by: The sealing device is composed of three parts: an outer cladding (1), an inner cladding (2) and a circular sphere (3); The outer cladding (1) and the inner cladding (2) are closely connected, and both the outer cladding (1) and the inner cladding (2) are annular pipes. The outer cladding (1) is made of polytetrafluoroethylene material, and the inner cladding (2) is made of stainless steel material. The inner cladding (2) is placed inside the outer cladding (1), and the inner wall of the outer cladding (1) is closely connected to the outer wall of the inner cladding (2). The round sphere (3) is placed inside the inner cladding (2). A plurality of evenly distributed grooves (4) are formed on the outer cladding (1); When sealing, the sealing device is installed in the bulb cross-flow pump device, specifically, the bulb cross-flow pump device includes a bulb body and a motor installed in the bulb body, one end of the water-facing surface of the bulb body is provided with a rotating shaft extension hole, a guide bearing is fixedly installed on the rotating shaft extension hole, the power output shaft of the motor passes through the guide bearing, and an impeller is installed on the rotating shaft passing through one end of the guide bearing; when installing, the sealing device is placed between the rotating shaft of the motor and the inner ring of the guide bearing, the outer wall of the outer layer (1) of the sealing device is sealed and fixedly connected to the inner wall of the guide bearing, and the inner wall of the outer layer (1) of the sealing device is sealed and fixedly connected to the rotating shaft of the motor; When in use, the motor is started and the motor shaft can rotate in the guide bearing; under the action of the sealing device, external water is prevented from flowing into the bulb body; After working underwater for a period of time, the water around the sealing device can penetrate into the inner cladding (2) through the groove (4). Under the action of the external water pressure, the circular sphere (3) in the inner cladding (2) is forced to move in the inner cladding (2). On the one hand, it can reduce the external water pressure and extend the service life of the sealing device. On the other hand, when the external water pressure is uniform and enters the inner cladding (2) from several grooved parts, the circular sphere (3) exhibits self-rotation under the action of the uniform water pressure; when the water pressure in several grooves (4) parts is inconsistent, the circular sphere (3) will move from the high-pressure groove to the low-pressure groove under the action of the uneven water pressure, thereby balancing the water pressure and avoiding the squeezing damage to the sealing device caused by the uneven water pressure.

2. The sealing method of the novel semi-enclosed sealing device of the bulb tubular pump according to claim 1 is characterized by: The number of the slots (4) is 3.

3. The sealing method of the novel semi-enclosed sealing device of a bulb tubular pump according to claim 1 is characterized by: The groove (4) is semi-enclosed, with a semicircular cross section, and the groove positions of the outer cladding (1) and the inner cladding (2) are consistent.

4. The sealing method of the novel semi-enclosed sealing device of a bulb tubular pump according to claim 1 is characterized by: The diameter of the circular sphere (3) is slightly smaller than the inner diameter of the inner cladding (2), and the circular sphere (3) can move freely in the inner cladding (2).

5. The sealing method of the novel semi-enclosed sealing device of the bulb tubular pump according to claim 1 is characterized by: D is the inner diameter of the stainless steel inner cladding (2), d is the diameter of the sphere (3), and L is the width of the slot, i.e., L is the slot width of the slot (4); then: D=2d; Assume that R1 is the thickness of the polytetrafluoroethylene outer layer and R2 is the thickness of the stainless steel inner layer (2); then: R1=R2; R1=0.2d; R2=0.2d.

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