KR102513015B1 - A Rotary Valve With Increased Durability By Shutting Off Leakage Of Powder - Google Patents

Abstract

The present invention relates to a rotary valve for blocking the transmission of high temperature by blocking the approach of powder to a bearing and using separation from a high-temperature and high-pressure space. The present invention provides a rotary valve for selectively moving high-temperature and high-pressure powder, comprising: a valve housing having an inlet and an outlet formed on an upper side and a lower side respectively, having a cylindrical space with the center of an axis in a horizontal direction formed therein, and having both sides opened in an axial direction; a rotary rotating part including a shaft, which is arranged at the center of the axis and protrudes to both sides of the valve housing, an impeller formed on the outer surface of the shaft in the cylindrical space, and an impeller drum coupled to both sides in the axial direction of the impeller; a side cover coupled to both sides of the valve housing so that the cylindrical space can be sealed hermetically together with the valve housing, and including a through-hole passed by the shaft; a bearing mounted on the shaft outside the side cover; a bearing holder having the bearing mounted thereon and mounted on the side cover while covering the bearing to protect the bearing from foreign materials; and a first sealing installed between the shaft and the side cover to prevent the ejection of moving powder into the cylindrical space, wherein the bearing and the first sealing are arranged with a gap therebetween in the axial direction of the shaft, and a second sealing is installed on the shaft adjacently to the bearing to have a buffering space from the first sealing as arranged with a gap therebetween.

Description

Rotary valve with increased durability by shutting off leakage of powder {A Rotary Valve With Increased Durability By Shutting Off Leakage Of Powder}

The present invention relates to a rotary valve whose durability is increased by blocking outflow of powder, and more particularly, to a rotary valve which blocks access of powder to a bearing and blocks transmission of high temperature by separating it from a high-temperature and high-pressure space.

In general, the rotary valve is mainly installed in the last process, and an impeller is provided inside the valve device made of a cylindrical shape to discharge a fixed amount to the lower part when the impeller rotates, and is composed of a system in which discharge is blocked when the impeller stops.

1 is a view of an 'impeller used in a rotary valve for high temperature and high pressure' filed by the inventor of the present application on April 29, 2013 and registered as Korean Patent Registration No. 10-1287779 on July 12, 2013. As shown, the 'impeller used in the high-temperature and high-pressure rotary valve' is an impeller 1 used in a rotary valve that moves pulverized coal at high temperature and high pressure, and includes a support plate 2 provided at a lower part of the rotary valve; and a plurality of anti-vibration pads 3 provided below the support plate 2 to prevent vibration generated from the rotary valve. an impeller housing 4 provided on one side of the support plate 2 to discharge pulverized coal from the top to the bottom; And a main body portion having first flanges 5a provided on the upper and lower portions of the impeller housing 4 to input and discharge pulverized coal, and second flanges 5b provided on the left and right sides of the impeller housing 4. (5); A motor fixing plate (6) provided on an upper portion of the main body part (5) on one side of the support plate; a drive unit (7) provided with a reduction motor (7a) above the motor fixing plate (6); and a sensor unit 8 provided to discharge a fixed amount when the drive unit 7 operates to one side of the main body unit 5.

In addition, in Korea Patent Registration No. 10-1287779, a bearing 9 is provided so that friction does not occur with the impeller housing 4 when the impeller rotates, and a configuration for protecting the bearing is provided.

That is, as shown in FIG. 2, the oil ring 10 is coupled to both sides of the rotating shaft of the impeller 1 inserted into the impeller housing 4, and the bearing 9 is mounted outside the oil ring. In addition, an oil cap flange 11 is provided to surround the oil ring 10 and to be coupled with the second flange 5b, and an oil cap 12 is provided to surround the bearing 10 on one side of the oil cap flange.

In addition, an oil inlet 12a is provided above the oil cap, and the oil inlet 12a penetrates from the outside to the inside of the oil cap, and the frictional force and frictional heat generated when the rotating shaft coupled to the bearing rotates It consists of injecting oil through an oil inlet to reduce the pressure. Therefore, despite the continuous rotation of the impeller, oil is injected and the life of the bearing is extended.

However, when the impeller shaft is continuously subjected to a powder load under high temperature and high pressure conditions, a gap is generated between the impeller shaft and the thread, and air and powder are ejected through the gap.

The patent developed to solve these problems is Korea Patent Registration No. 10-2335634 'rotary valve for high temperature and high pressure' registered on 2021.12.01. In Korean Patent Registration No. 10-2335634, as shown in FIG. 3, a lip seal 23 of a circular structure is installed between the impeller drum 21 and the side cover 22 to rotate the rotary part in the valve housing 24 In the process of powder being transported by the drive of (25), the gap between the impeller drum 21 and the side cover 22 is airtight to primarily block the ejection of powder, and the impeller shaft and By installing the inner oil chamber 27 and the outer oil chamber 28 between the side cover and the impeller shaft and the bearing holder, respectively, these gaps are airtight to fundamentally block the powder ejected from the valve housing toward the ball bearing, thereby improving the reliability of the rotary valve. can prolong life.

However, at a high temperature of 450 ° C or higher and a high pressure of 6 ~ 7 kPa, powder may be ejected between the impeller shaft and the side cover even in the invention according to Korean Patent Registration No. 10-2335634, which is expected to cause damage to the bearing. do. This is because powder ejection toward the oil chamber occurred in Korean Patent Registration No. 10-1287779 of the present inventor, which uses the same two-layered oil seal as in Korean Patent Registration No. 10-2335634.

Korean Patent Registration No. 10-2335634 (2021.12.06. Notice)

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotary valve that blocks access of powder to a bearing.

Another object of the present invention is to provide a rotary valve that blocks transmission of high temperature due to separation from a high-temperature and high-pressure space.

According to the characteristics for achieving the above object, the rotary valve having increased durability by blocking powder outflow is a rotary valve for selectively moving high-temperature and high-pressure powder, and an inlet and an outlet are formed on the upper and lower sides, respectively. a valve housing having a cylindrical space having an axial center in a horizontal direction and opening both sides in an axial direction; A rotary rotating unit including a shaft disposed at the center of the shaft and protruding from both sides of the valve housing, an impeller formed on an outer surface of the shaft in the cylindrical space, and an impeller drum coupled to both sides in an axial direction of the impeller; a side cover coupled to both sides of the valve housing to seal the cylindrical space with the valve housing and having a through hole through which the shaft passes; a bearing mounted on the shaft outside the side cover; a bearing holder mounted on the side cover in a state in which the bearing is seated and covers the bearing to protect the bearing from foreign substances; and a first seal installed between the shaft and the side cover to prevent ejection of powder moving into the cylindrical space, wherein the bearing and the first seal are spaced apart from each other in the axial direction of the shaft, and the distance A second seal is installed on the shaft adjacent to the bearing so as to have a buffering space with the first seal in the arranged state.

The bearing holder is formed with a powder outlet passing through the buffer space to the outside so that the powder ejected through the first seal is discharged to the outside before passing through the second seal.

At this time, the powder outlet may be formed at a lower end of the bearing holder so that the powder ejected through the first seal is discharged to the outside through free fall.

In addition, the powder discharge port is composed of a first section formed in a tangential direction at the lower end close to the inner periphery having the maximum width in the horizontal direction of the buffer space, and a second section extending from the first section to a certain width and penetrating to the outside. can

In order to prevent inflow of foreign substances into the buffer space when the rotary valve is not in use, a blocking cap may be mounted in surface contact with an inner circumferential surface of the second section of the powder outlet.

In addition, a pressurizing means for preventing separation of powder through the first sealing by reducing a pressure difference between the cylindrical space and the buffer space by applying pressure to the buffer space may be mounted in the powder outlet.

According to the rotary valve in which durability is increased by blocking outflow of powder according to the present invention, it is disposed apart from a seal sealing a high-temperature and high-pressure space and ejected powder is discharged to the outside through free fall to block powder access to the bearing, thereby reducing the bearing's It has the advantage of increasing the service life.

In addition, according to the present invention, there is an advantage that it is okay to use a general product as a seal to protect a bearing as high pressure is not directly applied while being separated from a high temperature and high pressure space and high temperature transfer is limited.

1 to 3 are views showing a rotary valve according to the prior art;
4 is a cross-sectional view showing the configuration of a rotary valve according to the present invention;
5 is a cross-sectional view taken along line A-A' of FIG. 4;
6 is a view showing a state in which a blocking cap is inserted into the powder outlet according to the present invention;
7 is a cross-sectional view showing a state in which the pressing means is mounted;
8 is a view explaining the operation of the rotary valve according to the present invention.

Features and advantages of the present invention will be more clearly understood by the embodiments described by the accompanying drawings.

The application of the present invention is not limited by the configuration and arrangement of components described in the embodiments or shown in the drawings. The invention is capable of implementation in other embodiments and of being carried out in various ways. In addition, expressions and predicates used in the embodiments with respect to terms such as the orientation of devices or elements are merely used to simplify the description of the present invention, and do not indicate or imply that related devices or elements should simply have a specific orientation. don't For example, although terms such as "first" and "second" are used in the embodiments describing the present invention and in the claims, these terms are not intended to indicate or imply relative significance or meaning.

In addition, the terms or words used in this specification and claims should not be construed as being limited to a conventional or dictionary meaning, and the inventors should not use the technical spirit of the present invention to explain the terms and concepts of the invention in the best way. It should be interpreted as written based on the corresponding meaning and concept.

Therefore, the present invention is not limited to the presented embodiments, and within the technical equivalent range described in the technical spirit of the present invention and the claims to be described below by those skilled in the art to which the present invention belongs Various modifications and changes are possible.

In the following, the present invention will be described in detail with reference to the accompanying drawings.

4 is a cross-sectional view showing the configuration of a rotary valve according to the present invention, and FIG. 5 is a cross-sectional view taken along the line AA′ of FIG. 4 . And Figure 6 is a view showing a state in which the blocking cap is inserted into the powder discharge port according to the present invention. In FIGS. 5 and 6, the corresponding portion is marked in black to indicate the powder discharge port.

As shown, the rotary valve according to the present invention is for selectively moving high-temperature and high-pressure powder, and largely includes a valve housing 30, a rotary rotating part 40, a side cover 50, a bearing 60, and a bearing holder. 70 and a first seal 80, and a configuration is added to prevent powder passing through the first seal 80 by high temperature and high pressure from being attached to the bearing 60 and contaminating the bearing 60. It is equipped with

The valve housing 30 has an inlet 31 and an outlet 32 formed on the upper and lower sides, a cylindrical space having an axis center in the horizontal direction is formed, both sides are open in the axial direction, and the rotary rotating part 40 ) is disposed at the center of the shaft and protrudes on both sides of the valve housing 30, an impeller 42 formed on the outer surface of the shaft 41 in the cylindrical space, and the impeller 42 ) Includes an impeller drum 43 coupled to both sides of the axial direction. And the side cover 50 is coupled to both sides of the valve housing 30 so that the cylindrical space is sealed together with the valve housing 30 and has a through hole through which the shaft 41 passes, and the bearing 60 is for supporting smooth rotation of the shaft 41 and is mounted on the shaft 41 outside the side cover 50 . In addition, the bearing holder 70 is mounted on the side cover 50 while covering the bearing 60 so that the bearing 60 is seated and protects the bearing 60 from foreign substances, and the first sealing 80 ) is installed between the shaft 41 and the side cover 50 to prevent ejection of powder moving into the cylindrical space.

Various materials can be used as the first seal 80, and generally oil seals and lip seals can be used, and in this embodiment, a lip seal is used. The lip seal generally uses Teflon, which has strong abrasion resistance, chemical resistance, heat resistance, and excellent durability even under high speed and high pressure, in order to compensate for the weakness of rubber material seals. Since such sealing is well known to those skilled in the art, a detailed description thereof will be omitted.

As shown in FIG. 4, since the rotary rotating part 40 selectively moves the high-temperature and high-pressure powder while rotating in the cylindrical space, high pressure acts between the shaft 41 and the side cover 50, resulting in In order to prevent the separation of the powder, the first seal 80 is arranged in two layers. However, when exposed to high temperature and high pressure for a long period of time, powder ejection occurs, and the ejected powder adheres to the surface of the bearing 60 to contaminate the bearing 60 and generate frictional resistance, thereby shortening the life of the bearing 60. has a shortening effect.

In order to prevent this, in the present invention, the bearing 60 and the first seal 80 are spaced apart in the axial direction of the shaft 41, and in the spaced state, the buffer space (S) with the first seal 80 ), the second seal 90 is installed on the shaft 41 adjacent to the bearing 60. That is, the second seal 90 is spaced apart from the first seal 80 to form a buffer space S therebetween so that the high pressure does not act on the second seal 90 and the bearing 60 is freed from foreign substances. It serves as a cover to protect against

At this time, various seals can be used as the second seal 90, similar to the first seal 80. Unlike the first seal 80, it is not used in an environment where high pressure acts, so a seal that is cheaper than lip seal, e.g. For example, a gland packing, an O-ring, or the like may be used.

In addition, the bearing holder 70 has a powder discharge hole passing through the buffer space S to the outside so that the powder ejected through the first seal 80 is discharged to the outside before passing through the second seal 90. (71) is formed. The powder outlet 71 is preferably formed at least horizontally or inclined downward to facilitate powder discharge, and most preferably is formed vertically at the lower end of the bearing holder 70 so that the powder can freely fall. .

At this time, it is preferable that the section entering the powder outlet 71 from the buffer space S is configured so that no elements obstructing the entry of powder due to a step or the like are created. To this end, in this embodiment, the powder outlet 71 is It is illustrated that it is formed in the tangential direction at the lower end close to the inner periphery having the maximum width in the horizontal direction of the space (S).

At this time, if formed in the tangential direction at the lower end close to the maximum width in the horizontal direction, the powder outlet 71 is relatively narrow on the outside air side, so the lower end of the first section 71a formed in the tangential direction has a constant width in the first section 71a. It extends to and forms a second section 71b passing through to the outside.

In addition, since this second section 71b is formed with a certain square hole, it is easier to mount the blocking cap 72 on the powder outlet 71. That is, when the rotary valve is not in use, a blocking cap 72 is provided in the second section 71b of the powder discharge port 71 to prevent the inflow of foreign substances into the buffer space S. ) can be mounted in surface contact with the inner circumferential surface of the

In addition, powder is ejected into the first seal 80 between the shaft 41 and the side cover 50 because the pressure in the cylindrical space inside the valve housing 30 is significantly higher than the pressure outside the first seal 80. Because. Therefore, if the pressure outside the first seal 80 is increased to reduce the difference between the pressure inside the valve housing 30 and the pressure outside the first seal 80, the powder can be suppressed by that much. With this concept, the powder outlet 71 applies pressure to the buffer space S to reduce the pressure difference between the cylindrical space and the buffer space S outside the first seal 80, thereby reducing the first seal 80 ) Pressing means (P) to prevent the separation of the powder through can be mounted.

The pressurizing means (P) may be made of various configurations, and for example, a method of increasing the pressure in the buffer space (S) by injecting air into the buffer space (S) may be applied.

And the powder discharge port 71 used at this time does not need to have the above-described configuration, but a passage that can be connected to the buffer space S and the outside is sufficient.

Next, the operation of the rotary valve whose durability is increased by blocking outflow of powder according to the present invention will be described.

8 is a view explaining the operation of the rotary valve according to the present invention.

When high-temperature and high-pressure powder is introduced into the inlet 31 of the valve housing 30, the shaft 41 of the rotary part 40 rotates while the impeller 42 moves a certain amount of powder to the outlet of the valve housing 30. Quantitatively discharged with (32). If the powder discharge is to be blocked, the rotation of the shaft 41 is stopped, and thus the driving of the impeller 42 is also stopped, so the powder discharge is stopped.

Since powder is supplied in a high-temperature and high-pressure environment, high-temperature and high-pressure are applied to the cylindrical space in the valve housing 30, and thus, the sealing between the shaft 41 and the side cover 50, which are vulnerable to pressure, is broken. important to prevent eruption of Therefore, a first sealing 80 is mounted between the shaft 41 and the side cover 50 to prevent the powder from blowing out, and is arranged in two layers to ensure this.

However, when exposed to high temperature and high pressure for a long period of time, powder ejection occurs, and the ejected powder adheres to the surface of the bearing 60 to contaminate the bearing 60 and generate frictional resistance, thereby shortening the life of the bearing 60. has a shortening effect.

Therefore, in the present invention, by installing the second seal 90 adjacent to the bearing 60 in the buffer space S thus formed by leaving a space between the first seal 80 and the bearing 60 in the axial direction of the shaft. Blocks the ejected powder from approaching the bearing (60). At this time, unlike the front and back of the first seal 80, a large pressure difference does not act between the front and back of the second seal 90, so the passage of foreign substances can be blocked relatively easily.

Moreover, in the present invention, a powder outlet 71 is formed in the bearing holder 70 so that the powder ejected through the first seal 80 is discharged to the outside before passing through the second seal 90. At this time, the powder discharge port 71 is formed vertically downward so that the powder can be discharged to the outside while freely falling.

In addition, since the section entering the powder outlet 71 from the buffer space S is formed so that no elements obstructing the entry of the powder due to steps or the like are formed, the powder naturally flows into the powder outlet 71 and is discharged to the outside.

A blocking cap 72 can be mounted on the powder outlet 71, so that the powder outlet 71 can be blocked when the rotary valve is not in use, thereby blocking the inflow of foreign substances into the buffer space S.

On the other hand, free fall through the powder outlet 71 can be implemented without any cost by using gravity, but it may be necessary to collect the powder discharged through the powder outlet 71 depending on the process and environment.

Moreover, there may be cases where the powder can act as a foreign substance in another process due to the random discharge of the powder. It may be raised to reduce the pressure difference between the front and back of the first seal 80. That is, when the pressure difference between the front and rear of the first seal 80 is reduced, the pressure applied to the first seal 80 is reduced by that amount, so that the ejection of powder through the first seal 80 can be suppressed.

As described above, the rights of the present invention are defined by what is described in the claims, not limited to the embodiments described above, and various modifications and adaptations within the scope of rights described in the claims by those skilled in the art in the field of the present invention It is self-evident that you can do

30: valve housing 31: inlet
32: outlet
40: rotary rotating part 41: shaft
42: impeller 43: impeller drum
50: side cover
60: bearing
70: bearing holder 71: powder outlet
71a: first section 71b: second section
72: blocking cap
80: 1st ceiling
90: second ceiling
P: pressurization means
S: buffer space

Claims (6)

In the rotary valve for selectively moving high-temperature and high-pressure powder,
A valve housing 30 in which an inlet 31 and an outlet 32 are respectively formed on the upper and lower sides, a cylindrical space having an axial center in the horizontal direction is formed, and both sides are opened in the axial direction;
The shaft 41 disposed at the center of the shaft and protruding on both sides of the valve housing 30, the impeller 42 formed on the outer surface of the shaft 41 in the cylindrical space, and the impeller 42 A rotary rotating part 40 including an impeller drum 43 coupled to both sides in the axial direction;
a side cover 50 coupled to both sides of the valve housing 30 to seal the cylindrical space together with the valve housing 30 and having a through hole through which the shaft 41 passes;
a bearing 60 mounted on the shaft 41 outside the side cover 50;
a bearing holder 70 mounted on the side cover 50 in a state in which the bearing 60 is seated and covers the bearing 60 to protect the bearing 60 from foreign substances; and
A first sealing 80 installed between the shaft 41 and the side cover 50 to prevent powder moving into the cylindrical space from being ejected; includes,
The bearing 60 and the first seal 80 are spaced apart from each other in the axial direction of the shaft 41, and have a buffer space S with the first seal 80 in a spaced state. A second seal 90 is installed on the shaft 41 adjacent to (60),
In the bearing holder 70, a powder outlet passing through the buffer space S to the outside so that the powder ejected through the first seal 80 is discharged to the outside before passing through the second seal 90 ( 71) is formed, characterized in that the rotary valve with increased durability by blocking the outflow of powder.
delete According to claim 1,
The powder discharge port 71 is formed at the lower end of the bearing holder 70 so that the powder ejected through the first sealing 80 is discharged to the outside through free fall, and durability is achieved by blocking powder outflow. Increased rotary valve.
According to claim 3,
The powder outlet 71 has a first section 71a formed in a tangential direction at the lower end close to the inner periphery having the maximum width in the horizontal direction of the buffer space S, and extends with a constant width in the first section 71a. A rotary valve in which durability is increased by blocking outflow of powder, characterized in that it consists of a second section 71b passing through to the outside.
According to claim 4,
When the rotary valve is not in use, a blocking cap 72 is provided in the second section 71b of the powder discharge port 71 to prevent the inflow of foreign substances into the buffer space S. A rotary valve with increased durability by blocking outflow of powder, characterized in that it is mounted in surface contact with the inner circumferential surface.
According to claim 1,
The powder outlet 71 applies pressure to the buffer space S to reduce the pressure difference between the cylindrical space and the buffer space S, thereby preventing the powder from escaping through the first seal 80. Pressing means A rotary valve in which durability is increased by blocking outflow of powder, characterized in that (P) is mounted.

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