KR100799263B1 - Double mechanical seal unit for mixer - Google Patents

Abstract

A double mechanical seal unit for a mixer is provided to require a small installation space since a circulating pump is not required by installing a cooling coil inside of the double mechanical seal unit. A double mechanical seal unit for a mixer includes a box housing(1100) and a pair of mechanical seals(1210,1220). An upper part of the box housing is coupled with a tank consisting a mixer having an impeller. A rotating power unit is mounted at a lower part of the box housing. An inlet(S1) and an outlet(S2) are formed at an outer peripheral surface of the box housing to introduce and discharge flushing fluid. A flushing fluid receiving unit(1130) is disposed in the box housing. The pair of mechanical seals are installed at a shaft receiving a rotation force from the rotation power unit. The lower part of the box housing has a cooling fluid inlet(1110), a cooling fluid outlet(1120), and a cooling coil. The cooling coil is connected to both ends of the cooling fluid inlet and the cooling fluid outlet. The cooling coil wraps the mechanical seals and controls the temperature of a flushing fluid received in the flushing fluid receiving unit.

Description

Double mechanical seal unit for stirrer {DOUBLE MECHANICAL SEAL UNIT FOR MIXER}

1 is a longitudinal sectional view of a double mechanical seal unit for agitator according to an embodiment of the present invention,

2 is a bottom view of FIG. 1;

3 is a plan view of FIG.

4 is a detailed view illustrating the main part of FIG. 1;

5 is an explanatory diagram showing an installation state of a stirrer using a conventional double mechanical seal unit;

Fig. 6 is a longitudinal sectional view showing a conventional double mechanical seal unit.

<Description of the symbols for the main parts of the drawings>

1000: Double Mechanical Seal Unit

1100: box housing 1110: cooling fluid inlet

1120: cooling fluid discharge unit 1130: flushing fluid receiving unit

1210,1220: Mechanical seal 1300: Cooling coil

1400: shaft 1410: flushing fluid shaft

1500: equalization cylinder

The present invention relates to a double mechanical seal unit for an agitator, and in particular, to maintain the life of the mechanical seal, so that a cooling device for supplying the flashing fluid and a pressure equalizing device to adjust the pressure using the pressure inside the tank are not required. The present invention relates to a double mechanical seal unit for a stirrer, which requires less installation space and lowers installation and maintenance costs.

In general, an agitator is a machine or utensil that stirs to mix or break something or to transfer heat evenly.

As an example of such a stirrer is shown in FIG. 5, a jacket 11 adapted to supply heat or steam, and the main rotary shaft 12a is rotatably installed in a central axis wrapped with the jacket and doubled. The main rotary shaft has a tank 12 provided with an impeller 12b, a base 13 assembled to a flange 12c formed at the top of the tank, and a main installed at the top of the base and vertically inserted into the tank. Coupled to the rotary power unit 14 consisting of a reducer (14a) and a motor (14b) for transmitting the rotational power to rotate the rotary shaft at a constant speed, and to transfer the rotational force of the rotary power unit to the main rotary shaft inside the base; A ring 15 and a double mechanical seal unit 16 is provided for sealing between the base and the tank.

The base 13 and the double mechanical seal unit 16 may be configured as one unit.

Here, as shown in FIG. 6, the double mechanical seal unit 16 is vertically connected to the sleeve shaft 16b fitted to the rotation shaft 16a connected to the main rotation shaft 12a to transmit rotational force. Two mechanical seals 16c and 16d are installed, and where the mechanical seals 16c and 16d are installed, a flushing fluid 16e cools the high heat coming from the tank 12 shown in FIG. S1 is installed in each of the box housings 16f, 16g, 16h, 16k, ... to be circulated while being discharged through the upper outlet S2.

The mechanical seals 16c and 16d generally include a floating seat (a), a sealing (b), a coupling (c), a drive pin (d), a coke (e), a set screw (f) and a spring (g). , O-rings (h, k), etc.

Meanwhile, in order to ensure the life of the double mechanical seal unit 16, a cooling fluid 16e is circulated in the double mechanical seal unit 16 and cooled by a cooling coil 18a for temperature control. The cooling device 18 to be supplied is additionally installed and used.

In addition, when a high pressure occurs in the double mechanical seal unit 16 and the pipe, when the pressure is lowered in the tank 12, a pressure equalizer 17 is installed and used to adjust the pressure synchronously.

The double mechanical seal unit 16 has a hole for pressure pressurization and a fluid inlet, and the flushing fluid 16e introduced through the hole has a double mechanical seal of about 10% higher than the pressure of the tank 12. Supply in between.

In addition, when the tank 12 is a high pressure, it is dangerous to use only the cooling device 18, so it is dangerous to pull out the fluid in the tank 12 and use the pipe 12 and the double mechanical seal because the pressure cannot be removed even if the pressure is reduced. Since the pressure acts as it is, there is a problem of aging, so that the equalizer 17 is used. At this time, the pressure of the tank 12 is maintained in the equalizer 17 piped from the tank 12. Since the pressure of the tank 12 is lowered because it is transmitted to the device 18, the pressure of the double mechanical seal unit 16 is also synchronously lowered. I do not go.

However, the cooling device 18 and the equalizer 17, which are installed and used in an auxiliary manner with such a conventional stirrer, are very expensive, but have to be used, and the cooling device 18 and the equalizer 17 take place. It occupies a lot, there is a wide installation area problem, there is a problem in maintenance and repair.

In addition, if the circulation is difficult when the distance between the double mechanical seal unit and the cooling device is installed at a high temperature, there is a problem in that a circulation pump or the like is additionally used.

The present invention has been made to solve the above problems, the installation of the cooling coil in the double mechanical seal unit, there is no need to install a separate cooling device, the cooling pump immediately because it generates heat, so the circulation pump is Its primary purpose is to provide a double mechanical seal unit for agitators that is not required.

In addition, the present invention by installing a pressure adjuster such as a pressure equalizer inside the double mechanical seal unit, there is no need to install a separate pressure equalizer, which requires less installation space, as well as reducing the risk factors and longer life, Its second purpose is to provide a double mechanical seal unit for agitators that is made easier.

The double mechanical seal unit for the agitator according to the present invention for achieving the above object is coupled to the tank constituting the stirrer with an impeller at the bottom, the upper part of the rotating power unit consisting of a motor and a reducer to rotate the impeller in the tank In addition to being seated to deliver to the main rotation shaft is installed, the outer circumference is formed in the inlet and outlet for circulating the flushing fluid flows in and out, the inside of the box housing is provided with a flushing fluid receiving portion, and received the rotational force from the rotational power unit It includes a pair of mechanical seals installed to prevent the leakage of the flushing fluid to the upper and lower shafts, wherein the lower box housing in which the mechanical seals are installed is configured to discharge the cooling fluid inlet and the cooling fluid configured to enter the cooling fluid Cooling fluid discharge unit and the cooling Cooling fluid is circulated at both ends of the fluid inlet and the cooling fluid discharge unit to surround the mechanical seal, and comprises a cooling coil installed to adjust the temperature of the flushing fluid accommodated in the flushing fluid accommodation unit.

The double mechanical seal unit for agitator according to the present invention has a predetermined length of the flushing fluid shaft receiving portion in the longitudinal direction so as to communicate with the flushing fluid receiving portion at the center in the axial direction even in the axis receiving the rotational force from the rotating power unit provided with the mechanical seal. It is characterized by.

The double mechanical seal unit for the stirrer according to the present invention is moved up and down by moving downward while being influenced by the pressure of the flushing fluid receiving portion at the lower portion of the box housing, and by increasing the pressure in the tank. It characterized in that it further comprises a pressure equalizing cylinder installed to descend.

The double mechanical seal unit for the stirrer according to the present invention is coupled to the tank constituting the stirrer having an impeller at the bottom thereof, and the rotary power unit composed of the motor and the reducer at the top thereof is mounted to transmit the rotational force to the main rotary shaft in which the impeller in the tank is installed. In addition, the outer circumferential surface is formed in the inlet and outlet for circulating the flushing fluid flows in and out, the inside of the box housing is provided with a flushing fluid receiving portion, and the upper and lower flushing fluid on the shaft receiving the rotational force from the rotating power unit And a pair of mechanical seals installed to prevent leakage, the lower portion of the box housing being affected by the increase in the pressure of the flushing fluid receiving portion and moving to the lower portion and being raised by the pressure in the tank being raised. Descending by going down It characterized in that it further comprises a pressure equalizing cylinder is installed.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the double mechanical seal unit for agitator according to an embodiment of the present invention.

1 is a longitudinal cross-sectional view of a double mechanical seal unit for a stirrer according to an embodiment of the present invention, Figure 2 is a bottom view of Figure 1, Figure 3 is a plan view of Figure 1, Figure 4 illustrates the main part of Figure 1 As the detailed view, the same reference numerals are given to the same parts as those in Figs. 5 and 6, which describe the prior art, and the description thereof is omitted.

The double mechanical seal unit for the stirrer of the present invention is coupled to the tank 12 constituting the stirrer having an impeller 12b at the bottom thereof, and at the top thereof, a rotary power unit 14 including a motor 14b and a reducer 14a. ) Is not only seated to transmit rotational force to the main rotary shaft 12a in which the impeller 12b in the tank 12 is installed, but also has an inlet (S1) and an outlet (S2) configured to circulate so that the flushing fluid is introduced and discharged on the outer circumferential surface thereof. And a box housing 1100 having a flushing fluid accommodating part 1130 therein, and a pair of mechanical devices installed to prevent the flushing fluid from leaking to the upper and lower parts of the shaft receiving the rotational force from the rotary power unit 14. Seals 1210 and 1220.

The circulation structure of the inlet port S1 and the outlet port S2 for introducing and discharging the flushing fluid into the flushing fluid accommodating part 1130 may be variously changed by the shape and size of the box housing 1100.

In addition, the mechanical seals 1210 and 1220 generally include a floating seat (a), a sealing (b), a coupling (c), a drive pin (d), a coke (e), a set screw (f), and a spring (g). ), O-rings (h, k), etc.

Herein, the gist of the present invention includes a cooling fluid inlet 1110 and a cooling fluid discharge configured to discharge the cooling fluid into the box housing 1100 at which the mechanical seals 1210 and 1220 are installed. Part 1120, the cooling fluid inlet 1110 and the cooling fluid discharge unit 1120 is connected to the cooling fluid at both ends to circulate the mechanical seals (1210, 1220) while enclosing the flushing fluid receiving unit (1130) Cooling coil 1300 is installed to control the temperature of the flushing fluid accommodated in the).

The cooling fluid inlet 1110 and the cooling fluid discharge 1120 are partitioned and separated from each other. In addition, the cooling fluid inlet 1110 and the cooling fluid discharge unit 1120 may be variously changed according to the shape of the box housing 1100.

Therefore, when the cooling fluid is introduced into the cooling fluid inlet 1110 and supplied to the cooling coil 1300 from the cooling device (not shown), the mechanical seals 1210 and 1220 and the tank 12 and the impeller 12b are rotated. Since the heat is made by the cooling coil 1300 in the flushing fluid accommodating part 1130 to cool the flushing fluid to cool the heat transferred from the shaft for cooling is made temperature control. In addition, since the cooling coil 1300 is installed in the flushing fluid accommodating part 1130, a separate cooling device capable of performing heat exchange is not required. Accordingly, the installation space is reduced, and the installation cost is also low.

At this time, since the cooling coil 1300 cools the shaft and the mechanical seal directly, the circulation pump is not required.

In addition, the present invention, as shown in Figures 1 and 4, in the axis 1400 received the rotational force from the rotational power unit 14, the mechanical seals 1210, 1220 is installed in the axial center of the flushing fluid receiving portion It is characterized in that the constant length flushing fluid shaft receiving portion 1410 is formed in the longitudinal direction so as to communicate with (1130).

Here, the flushing fluid shaft accommodating part 1410 may be connected in various paths to facilitate the flushing of the flushing fluid in the flushing fluid accommodating part 1130.

Therefore, the cooling efficiency of the mechanical seal unit 1200 is further increased.

In addition, reference numeral 1101 denotes a through hole for fixing the box housing 1100 to the upper portion of the tank 12 by a fastening means 1102 such as a bolt.

In addition, the lower portion of the box housing 1100 is affected by the increase in the pressure of the flushing fluid receiving portion 1130 to move downward and ascends and descends as the pressure in the tank 12 rises. It is characterized in that it further comprises a pressure equalizing cylinder 1500 installed to descend.

Here, the equalization cylinder 1500 may form various flow paths 1510 and chambers 1520 according to the shape and size of the box housing 1100, and may be installed to move in accordance with pressure changes in the chambers 1520. Of course.

Accordingly, as the pressure inside the tank 12 changes as the fluid inside the tank 12 is discharged, that is, the pressure inside the tank 12 decreases, the equalizing cylinder 1500 descends while the flushing fluid is lowered. Since the volume of the accommodating part 1130 is increased, the pressure of the flushing fluid accommodating part 1130 goes down, and when the pressure inside the tank 12 goes up to a high pressure, the equalizing cylinder 1500 rises. The pressure of the flushing fluid receiving portion 1130 is maintained at about 10% higher than the pressure in the tank 12, thereby preventing the pressure of the tank 12 from rising upward.

That is, since the pressure equalizing cylinder 1500 is installed, the flushing fluid may be organically generated according to the pressure change of the tank 12 without installing the expensive pressure equalizing device 17 separately from the mechanical seal unit 1200 as in the related art. Since the pressure of the accommodation unit 1130 is adjusted to prevent high pressure from being applied to the pipe and the mechanical seal unit 1200, there is an effect of safe and extended life.

As described above, according to the double mechanical seal unit for the stirrer of the present invention, a cooling coil is installed in the double mechanical seal unit, and there is no need to install a separate cooling device. Since it is not necessary, it requires less installation space and has excellent stability.

In addition, according to the double mechanical seal unit for the stirrer of the present invention, by installing a pressure adjusting unit such as a pressure equalizer inside the double mechanical seal unit, there is no need to install a separate pressure equalizer, which requires less installation space, Reduced lifespan is long, while also easy to manage.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (5)

The lower part is coupled with the tank 12 constituting the stirrer with the impeller 12b, and in the upper part, the rotary power unit 14 including the motor 14b and the reducer 14a transmits the rotating force to the impeller (12) in the tank 12. 12b) is not only seated to be delivered to the main rotary shaft (12a) is installed, the outer peripheral surface is formed with an inlet (S1) and outlet (S2) for circulating so that the flushing fluid flows in and out, and the inside of the flushing fluid receiving portion (1130) For a stirrer including a box housing (1100) provided, and a pair of mechanical seals (1210, 1220) installed to prevent the flushing fluid from leaking to the upper and lower portions on the shaft receiving the rotational force from the rotary power unit (14) In the mechanical seal unit, A cooling fluid inlet 1110 configured to introduce cooling fluid into the box housing 1100 at which the mechanical seals 1210 and 1220 are installed, and a cooling fluid discharge part 1120 configured to discharge the cooling fluid; The cooling fluid is connected to the cooling fluid inlet part 1110 and the cooling fluid discharge part 1120 at both ends so as to surround the mechanical seals 1210 and 1220 and to receive the flushing fluid accommodated in the flushing fluid accommodating part 1130. Mechanical seal unit for agitator, characterized in that it comprises a cooling coil (1300) installed to adjust the temperature. The method of claim 2, The shaft 1400, which receives the rotational force from the rotary power unit 14 provided with the mechanical seals 1210 and 1220, has a predetermined length in the longitudinal direction so as to communicate with the flushing fluid receiving unit 1130 at an axial center thereof. Double mechanical seal unit for agitator, characterized in that the portion (1410) is formed. The method according to claim 1 or 2, The lower part of the box housing 1100 is affected by the increase in the pressure of the flushing fluid receiving part 1130 to move to the lower side and to be lowered by being raised and lowered by the rising pressure in the tank 12. Mechanical seal unit for agitator, characterized in that it further comprises a pressure equalizing cylinder (1500) installed. The lower part is coupled with the tank 12 constituting the stirrer with the impeller 12b, and in the upper part, the rotary power unit 14 including the motor 14b and the reducer 14a transmits the rotating force to the impeller (12) in the tank 12. 12b) is not only seated to be delivered to the main rotary shaft (12a) is installed, the outer peripheral surface is formed with an inlet (S1) and outlet (S2) for circulating so that the flushing fluid flows in and out, and the inside of the flushing fluid receiving portion (1130) For a stirrer including a box housing (1100) provided, and a pair of mechanical seals (1210, 1220) installed to prevent the flushing fluid from leaking to the upper and lower portions on the shaft receiving the rotational force from the rotary power unit (14) In the mechanical seal unit, The lower part of the box housing 1100 is moved by the pressure of the flushing fluid receiving part 1130 to be raised and lowered by being raised and lowered by the rising of the pressure in the tank 12. Mechanical seal unit for agitator, characterized in that it further comprises a pressure equalizing cylinder (1500). The method of claim 4, wherein The shaft 1400, which receives the rotational force from the rotary power unit 14 provided with the mechanical seals 1210 and 1220, has a predetermined length in the longitudinal direction so as to communicate with the flushing fluid receiving unit 1130 at an axial center thereof. Double mechanical seal unit for agitator, characterized in that the portion (1410) is formed.

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