JPH07217794A - Mechanical seal device - Google Patents

Abstract

PURPOSE:To eliminate the necessity of additionally cooling a lubricant oil cooling device as is conventionally made, by leading lubricating oil circulating through a seal part of a bearing for supporting a main axle, into an air-cooling type tube incorporated with fins, so as to cool the same by air blown into the cooling tube. CONSTITUTION:In an air-cooling type tube 9 incorporating fins, thin plate-like fins 11 are attached to the tube 9 at uniform intervals, orthogonal to the longitudinal direction. Although the fins 11 are preferably formed in a circular shape, it may be formed in any other polygonal shape such as a triangular or rectangular shape. Further, the tube 1 is preferably pressure-resistant, and is preferably formed of a material having a high thermal conductivity. The material quality, the shape and the number of the fins 11 attached to the tube 9 are selected so as to adjust the cooling temperature of cooling oil circulating through the tube 9. The tube 9 is connected to a seal part for circulating the lubricant oil, through connecting parts 12, 13. The tube 9 can be cooled by blowing air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical seal device. More specifically, a mechanical seal capable of efficiently cooling the lubricating oil circulated in the main reaction shaft of a stirring blade such as a chemical reaction tank or a post-treatment tank for reaction products, or the seal portion of a main shaft such as a pump for transferring chemical substances. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, main shafts such as agitation shafts for chemical reaction tanks, post-treatment tanks for reaction products, pumps for transferring chemical substances, etc. are supported by bearings, and the main shafts supported by bearings are smooth. It has a structure that circulates lubricating oil to enable sliding. Also, when there is a pressure difference between the inside and outside of the tank,
It is necessary to seal so as to maintain this differential pressure, and for this purpose, a mechanical seal device has been proposed in which pressurized lubricating oil circulates in the bearing.

The lubricating oil circulated in the mechanical seal device often rises in temperature due to the influence of frictional heat due to the rotation of the main shaft and the temperature of the contents of the tank. If the temperature of the lubricating oil becomes too high, problems such as abnormal friction due to thermal expansion of the components that make up the mechanical seal device, premature aging of components such as the rubber ring of the seal portion, deterioration of the lubricating oil, and evaporation will occur.
Not preferable. Therefore, the lubricating oil circulated in the mechanical seal device needs to be cooled so that the temperature does not rise.

As a method of cooling the lubricating oil to be circulated, conventionally, a lubricating oil cooling device is separately installed outside the mechanical seal device, the lubricating oil is circulated to the lubricating oil cooling device, and the lubricating oil is cooled with a refrigerant such as water. Has been adopted. However, such a conventional method requires a separate preparation of a lubricating oil cooling device, which requires a considerable amount of initial investment, and a mechanical seal device including pipes, cooling devices, etc. at regular intervals after operation. There is a drawback that the operating cost will be large, such as the need to disassemble and clean the whole.

[0005]

DISCLOSURE OF THE INVENTION The present inventors have conducted intensive studies to provide a mechanical seal device that eliminates the above-mentioned conventional drawbacks, and as a result, completed the present invention.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a mechanical seal device for cooling lubricating oil by circulating the lubricating oil in a seal portion of a bearing that supports a rotating main shaft, and circulating the lubricating oil in a finned air-cooled tube. However, the air-cooled tube with fins is configured to be cooled by blowing air.

An example of the mechanical seal device according to the present invention is shown in the drawings below, and will be described in detail based on the drawings. 1 is a perspective view of a metering pump for transferring a chemical substance, which incorporates a mechanical seal device according to the present invention, and FIG.
FIG. 3 is a side view of an air-cooled tube with fins that circulates lubricating oil.

In the figure, 1 is a motor, 2 is a coupling cover, 3 is a pump, 4 is a mechanical seal portion, 5
Is a fixed vane casing, 6 is a fluid suction pipe, 7 is a fluid discharge pipe, 8 is a fluid, 9 is an air-cooled tube with fins, 10 is a tube, 11 is a fin, 12 and 13 are connection parts, and 14 is a motor cooling Fan, 15 air intake,
Reference numeral 16 is air sucked into the cooling fan, and 17 is air for cooling the fins.

The mechanical seal device according to the present invention has a structure in which the lubricating oil is circulated in the seal portion of the bearing that supports the rotating main shaft to cool the lubricating oil. Examples of those having a rotating main shaft include, for example, a chemical reaction tank, a post-treatment tank for reaction products, a stirring tank for stirring a substance, a quantitative pump for quantitatively transferring a substance, and the like. It is not limited. Of course, in these chemical reaction tanks, post-treatment tanks for reaction products, etc., there may be a pressure difference, a temperature difference, etc. inside and outside.

The mechanical seal device according to the present invention has a structure in which lubricating oil is circulated in the fin-cooled air-cooled tube 9 and the fin-cooled air-cooled tube 9 is cooled by blowing air. The tube 10 of the finned air-cooled tube 9 functions to circulate the lubricating oil, and the fin attached to the tube functions to cool the lubricating oil circulating in the tube 10.

The air-cooled tube 9 with fins, as an example of which is shown in a side view in FIG. 2, has an outer wall of the tube, which is perpendicular to the length direction of the tube 9 at regular intervals.
A thin plate-shaped fin 11 is preferably attached. The shape of the fin 11 is most preferably circular, but may be polygonal such as triangular or quadrangular. The tube 10 is preferably pressure resistant, and the fins 11 are preferably made of a material having high heat conductivity. Fin 9 to attach tube 9
The cooling temperature of the lubricating oil circulating in the tube 9 can be adjusted by selecting the material, shape, and number of the No. 1 components.

The finned air-cooled tube 9 has a connecting portion 1
2 and 13 are connected to a seal portion that circulates lubricating oil. Lubricating oil is a tank structure with a mechanical seal device,
It is selected from conventionally known substances depending on the purpose of the tank, but may be a chemical substance transferred by a metering pump. In order to circulate the lubricating oil in the mechanical seal portion 4, it is usually good to install a lubricating oil circulation pump outside the tank to circulate it. It may be circulated by pressure.

FIG. 1 shows an example in which one of the connection parts of the finned air-cooled tube 9 is connected to the fluid discharge pipe 7 side and the other is connected to the mechanical seal part 4. In this example, the fluid 8 flowing in the fluid suction pipe 6 and pressurized by the metering pump blade is sucked in from the discharge pipe 7 side,
Alternatively, the structure is such that it is allowed to flow naturally, circulates in the finned air-cooled tube 9 along the arrow to be cooled, and the fluid 8 cooled in this way is returned to the mechanical seal portion 4. The fluid 8 returned to the mechanical seal portion 4 may be leaked to the fixed amount vane casing 5.

The finned air-cooled tube 9 is structured to be cooled by blowing air. The cooling air sent to the tube 9 may be generated by installing a dedicated cooling fan, but the air 17 for cooling the fins generated by the cooling fan 14 installed in the motor 1 for operating the spindle is utilized. Is preferred.

[0015]

The mechanical seal device according to the present invention is
It has the following excellent advantages and its industrial utility value is extremely large. (1) The mechanical seal device according to the present invention does not need to separately prepare a lubricating oil cooling device as in the conventional case, and therefore the initial investment is small, the maintenance of the device is simple, and the operating cost is small. (2) In the mechanical seal device according to the present invention, if the cooling air generated by the cooling fan installed in the motor that operates the main shaft is utilized, it is not necessary to install a special cooling fan.

[Brief description of drawings]

FIG. 1 is a perspective view of a metering pump for transferring a chemical substance incorporating an example of a mechanical seal device according to the present invention.

FIG. 2 Side view of an air-cooled tube with fins that circulates lubricating oil

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... Coupling cover 3 ... Pump 4 ... Mechanical seal part 5 ... Fixed quantity vane casing 6 ... Fluid suction pipe 7 ... Fluid discharge pipe 8 ... Fluid 9 ... Fin-cooled tube 10 ... Tube 11 ... Fin 12, 13 ... Connection part 14 ... Motor cooling fan 15 ... Air suction port 16 ... Air sucked by cooling fan 17 ... Air for cooling fins

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[Procedure amendment]

[Submission date] March 18, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Sato 3-10 Shiodori, Kurashiki-shi, Okayama Mitsubishi Kasei Co., Ltd. Mizushima Plant (72) Inventor Kazuaki Kawai 3-10, Shidori, Kurashiki-shi, Okayama Mitsubishi Kasei Co., Ltd. Mizushima Factory

Claims (5)

[Claims] 1. A mechanical seal device for cooling lubricating oil circulating in a seal portion of a bearing that supports a rotating main shaft, wherein the lubricating oil is circulated in an air-cooled tube with fins, and the air-cooled tube with fins is cooled by blowing air. A mechanical seal device characterized by being configured as follows. 2. The mechanical seal device according to claim 1, wherein the main shaft is a stirring shaft of the tank. 3. The mechanical seal device according to claim 1, wherein the main shaft is a shaft of a metering pump for transferring a fluid. 4. The mechanical seal device according to claim 2, wherein the lubricating oil is a liquid fluid transferred by a metering pump. 5. The air-cooled tube with fins is configured to be air-cooled by blowing cooling air generated by a cooling fan installed in a motor for operating a main shaft. Item 5. The mechanical seal device according to any one of items 4.