KR20120001401A

KR20120001401A - Pump sealing system

Info

Publication number: KR20120001401A
Application number: KR1020100062153A
Authority: KR
Inventors: 성주헌
Original assignee: 현대중공업 주식회사
Priority date: 2010-06-29
Filing date: 2010-06-29
Publication date: 2012-01-04

Abstract

PURPOSE: A shaft seal device of a pump is provided to minimize water leakage by generating screw pumping operation by concavo and convex regions which are alternately formed. CONSTITUTION: A shaft seal device of a pump comprises a shaft(100), a throttle bush(200), a chamber part and a grand cover(400). The concavo-convex regions are formed in the outer circumference of the shaft. The throttle bush is installed in order to surround the outer circumference of the shaft. The concavo-convex region is formed on the inner circumference in order to meet with the concavo-convex region at a right angle. The chamber part is formed at the junction of the housing and throttle bush. The cooling action and throttle bush internal pressure are decompressed in order to prevent the leaking of the fluid to the outside of the pump.

Description

Pump Sealing System {Pump Sealing System}

The present invention relates to a shaft sealing device of a pump, which processes spiral grooves in opposite directions on both throttle bushes and the sliding surfaces of the shaft to minimize leakage through screw pumping action, and to fix the throttle bush and the shaft by incorporation of foreign matter. It relates to a shaft seal of the pump that prevents.

In general, a lubrication chamber is provided around the shaft for preventing lubrication of air, fluid, and refrigerant through the shaft between the throttle bush, which is the stop side of a rotating device such as a centrifugal pump, a vacuum pump, and a compressor, and a shaft that is on the rotation side. A sealing member is installed to prevent leakage of lubricant and pressure filled in the air.

An example of such a sealing member is a mechanical seal. However, the mechanical seal is a contact type seal, which increases the rotational speed or increases the circumferential speed of the contact surface when the size of the pump is enlarged. Since it is vulnerable to abrasion due to impurities introduced between the sliding surface), the reliability of the pump shaft sealing device is not secured, and thus there is a significant problem in operating a power plant.

An object of the present invention for solving the above problems is to minimize the amount of leakage through the screw pumping action by the irregularities formed on the inner circumferential surface of the throttle bush (stop) and the outer circumferential surface of the shaft (rotator), It is to provide a shaft sealing device of the pump to reduce the amount of leakage by reducing the pressure between the shaft and the throttle bush when it is introduced to prevent the fixed to the shaft.

The present invention to achieve the object as described above and to perform the problem for eliminating the conventional defects, the sealing device for preventing the leakage of fluid between the housing of the pump and the shaft installed through the housing, the outer peripheral surface The shaft is formed in the uneven portion; A throttle bush installed to surround the outer circumferential surface of the shaft and having an uneven portion formed on an inner circumferential surface to intersect the uneven portion; The chamber is formed at the junction of the throttle bush and the housing and the cooling water is filled to enable the supply and discharge of the cooling water between the throttle bush and the shaft to reduce the cooling action and the internal pressure of the throttle bush to prevent fluid from leaking to the outside of the pump. part; It is installed to one side of the throttle bush to surround the shaft and is characterized in that it comprises a gland cover is formed on the inner peripheral surface so that the fluid does not leak to the outside.

The chamber unit may further include: a coolant supply chamber formed at a junction of the throttle bush and the housing to supply coolant between the throttle bush and the shaft; A bypass chamber adjacent to one side of the cooling water supply chamber and formed at a junction of the throttle bush and the housing and connected to a pressure part to lower the internal pressure of the throttle bush by bypassing the cooling water; A primary leakage chamber adjacent to the other side of the cooling water supply chamber and formed at a joint portion of the throttle bush and the housing so that fluid flowing between the shaft and the throttle bush can leak, thereby reducing the internal pressure of the throttle bush; And a secondary leak chamber which reduces the internal pressure of the throttle bush by allowing the fluid flowing between the shaft and the throttle bush to continuously leak adjacent to the primary leak chamber.

The apparatus may further include a temperature controller configured to measure the temperature of the coolant leaked through the first leak chamber and the second leak chamber, and to adjust the temperature of the coolant supplied to the coolant supply chamber.

As described above, according to the present invention, the stop side and the rotating side are made of a non-contact type, so that no damage occurs on the contact surface, so that it is applicable to a large-capacity pump, and a screw pumping action is generated by staggered irregularities. By minimizing leakage, preventing sedimentation due to incorporation of foreign matters, and reducing the leakage of fluid caused by pressure difference by reducing the inside of the throttle bush.An uneven part is formed on the inner circumferential surface of the grand cover so that the fluid leaks to the oil side. It is a very useful invention that can be blocked at first.

1 is a perspective view showing a state in which a shaft sealing apparatus according to the present invention is installed in a pump,
2 is an enlarged view showing a shaft sealing apparatus according to the present invention;
3 is a cross-sectional view showing a shaft sealing apparatus according to the present invention;
4 is an exemplary view showing a coolant flow according to the present invention;

Hereinafter, the configuration and the operation of the embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a perspective view showing a state in which a shaft sealing apparatus according to the present invention is installed in a pump, Figure 2 is an enlarged view showing a shaft sealing apparatus according to the present invention, Figure 3 is a sectional view showing a shaft sealing apparatus according to the present invention, Figure 4 Is an exemplary view showing a coolant flow according to the present invention,

As shown in the figure, the present invention prevents fluid from leaking between the housing 500 of the pump and the shaft 100 installed through the housing 500, and the shaft having the uneven portion 110 formed on the outer circumferential surface thereof. (100), the throttle bush 200 is installed to surround the outer circumferential surface of the shaft 100 and the uneven portion 210 is formed on the inner circumferential surface so as to intersect with the uneven portion 110 of the shaft 100, and It is formed at the junction of the throttle bush 200 and the housing 500, and the cooling water is filled therein to enable the supply and discharge of the cooling water between the throttle bush 200 and the shaft 100 to allow the cooling operation and the inside of the throttle bush 200. Chamber portion 300 for reducing the leakage of the fluid to the outside of the pump by reducing the pressure, and is installed on one side of the throttle bush 200 to surround the shaft 100 and the uneven portion 410 on the inner peripheral surface Is formed so that fluid To prevent the output is configured to include a grand cover 400.

As described above, by forming the uneven parts 110 and 210 to cross each other on the outer circumferential surface of the shaft 100 on the rotating side and the inner circumferential surface of the throttle bush 200 on the stationary side, the uneven parts 110 and 210 positioned to cross each other. The screw pumping action generated by) will minimize the leakage of fluid.

In addition, when foreign matter is introduced between the shaft 100 and the throttle bush 200, the adhesion between the shaft 100 and the throttle bush 200 is prevented.

Meanwhile, the chamber part 300 is formed at the junction of the throttle bush 200 and the housing 500 to provide a cooling water supply chamber 310 that provides a space for cooling water supply between the throttle bush 200 and the shaft 100. A pressure unit (for example, a booster pump) positioned to be adjacent to one side of the cooling water supply chamber 310 and formed at the junction of the throttle bush 200 and the housing 500 and lower than the inlet side of the throttle bush 200. Connected to the suction side to bypass the cooling water, thereby lowering the internal pressure of the throttle bush 200 to reduce the leakage of the fluid to the outside, and adjacent to the other side of the cooling water supply chamber 310. The fluid is circulated so that the fluid flowing between the shaft 100 and the throttle bush 200 is leaked to a recovery tank (not shown), which is formed at the junction of the throttle bush 200 and the housing 500. The primary leakage chamber 330 for reducing the internal pressure of the throttle bush 200 to reduce the leakage of the fluid to the outside of the pump, and the shaft 100 and the throttle are located adjacent to the primary leakage chamber 330 By allowing the fluid flowing between the bushes 200 to be continuously leaked to the recovery tank, the secondary leak chamber which reduces the circulation of the fluid and the internal pressure of the throttle bush 200 to reduce the leakage of the fluid to the outside of the pump ( 340).

The chamber unit 300 allows the coolant to circulate and at the same time leaks the coolant to lower the internal pressure of the throttle bush 200, thereby reducing the leakage of the fluid to the outside of the pump by the pressure difference. .

On the other hand, the grand cover 400 is to form a concave-convex portion 410 on the inner circumferential surface facing the shaft 100 to block the leakage of fluid flows to the oil side.

Meanwhile, the present invention measures the temperature of the coolant leaked through the first leak chamber 330 and the second leak chamber 340 to control the temperature of the coolant supplied to the coolant supply chamber 310 ( Characterized in that it further comprises 600)

Since the temperature of the fluid leaking to the outside of the pump is usually about 180 ㅀ, the temperature control part 600 vaporizes as it leaks to the outside, and generates a lot of water vapor. The temperature of the coolant can be lowered to lower the temperature of the leaking coolant. The measurement is to control the supply of coolant at a temperature lower than the leaking coolant temperature.

Referring to the action and effect that the leakage of the fluid by the shaft sealing device of the present invention configured as described above,

First, the shaft 100 rotates by the operation of the pump, and the cooling water is supplied between the shaft 100 and the throttle bush 200 through the cooling water supply chamber 310 to cool the heat generated when the pump is operated.

At this time, the fluid between the shaft 100 and the throttle bush 200 leaks to the outside due to the pressure difference, and the skew flow pumping action is performed by the uneven parts 110 and 210 formed on the throttle bush 200 and the shaft 100. This reduces the leakage of fluid.

In addition, the fluid is bypassed through the bypass chamber 320 to reduce the pressure inside the throttle bush 200 to reduce the amount of leakage of the fluid.

In addition, the fluid leaks into the recovery tank through the first and second leak chambers 330 and 340 to reduce the leakage of the fluid to the outside.

In addition, by reducing the leakage of the fluid to the outside by the concave-convex portion 410 formed on the inner circumferential surface of the grand cover 400 to prevent the cooling water to flow out to the oil side.

Meanwhile, by measuring the temperature of the coolant leaked through the first and second leak chambers 330 and 340 through the temperature control unit 600, the coolant that may leak to the outside by adjusting the temperature of the coolant to be supplied is lowered. It can be prevented from vaporizing.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

100: shaft 110: irregularities
200: throttle bush 210: irregularities
300: chamber portion 310: cooling water supply chamber
320: bypass chamber 330: primary leak chamber
(340): secondary leak chamber (400): grand cover
(410): Uneven portion 500: Housing
600: temperature control unit

Claims

In the sealing device for preventing the leakage of fluid between the housing of the pump and the shaft installed through the housing,
A shaft having an uneven portion formed on an outer circumferential surface thereof;
A throttle bush installed to surround the outer circumferential surface of the shaft and having an uneven portion formed on an inner circumferential surface to intersect the uneven portion;
The chamber is formed at the junction of the throttle bush and the housing and the cooling water is filled to enable the supply and discharge of the cooling water between the throttle bush and the shaft to reduce the cooling action and the internal pressure of the throttle bush to prevent fluid from leaking to the outside of the pump. part;
And a grand cover installed to one side of the throttle bush to surround the shaft and having an uneven portion formed on an inner circumferential surface thereof so that fluid does not leak to the outside.

The method of claim 1,
The chamber part,
A coolant supply chamber formed at a junction of the throttle bush and the housing to supply coolant between the throttle bush and the shaft;
A bypass chamber adjacent to one side of the cooling water supply chamber and formed at a junction of the throttle bush and the housing and connected to a pressure part to lower the internal pressure of the throttle bush by bypassing the cooling water;
A primary leakage chamber adjacent to the other side of the cooling water supply chamber and formed at a joint portion of the throttle bush and the housing so that fluid flowing between the shaft and the throttle bush can leak, thereby reducing the internal pressure of the throttle bush;
And a secondary leak chamber which reduces the internal pressure of the throttle bush by allowing the fluid flowing between the shaft and the throttle bush to continuously leak adjacent to the primary leak chamber. .

The method of claim 2,
Sealing the shaft of the pump characterized in that it further comprises a temperature control unit for measuring the temperature of the cooling water leaked through the first and second leak chamber and the temperature of the coolant supplied to the coolant supply chamber Device.