CN221033950U - Stirring reation kettle's bearing seal structure and stirring reation kettle - Google Patents

Abstract

The utility model relates to the field of shaft sealing, and discloses a shaft seal structure of a stirring reaction kettle and the stirring reaction kettle, which comprise a stuffing box and a stuffing feeding piece, wherein the stuffing box is provided with a sealing cavity for filling mud-like stuffing, the stuffing box is sleeved on a stirring shaft and is connected with the stirring reaction kettle, and a stuffing layer filled with mud-like stuffing is arranged in the sealing cavity; the filler feeding piece is connected with the filler box and communicated with the filler layer and is used for adding mud filler into the filler layer. The structure can reduce the abrasion of the mechanical seal, reduce the escape of the irritant gas of the polymerization kettle and realize the repair without stopping.

Description

Stirring reation kettle's bearing seal structure and stirring reation kettle

Technical Field

The utility model relates to the technical field of stirring shaft sealing of reactors, in particular to a shaft seal structure of a stirring reaction kettle and the stirring reaction kettle.

Background

The one-step polymerization reaction adopts a continuous stirred tank reactor, and a stirring shaft sealing filler is usually solid high-temperature-resistant high-pressure-resistant root filler. The packing, also called a braided packing, is usually braided from softer threads in different ways, square or rectangular, circular strips, for filling the sealing chamber, by axial pre-tightening compression, forcing radial deformation of the packing to achieve the sealing effect. Such materials have been used in large quantities in rotary pumps, reciprocating pumps, agitators, etc. because of their low cost and ease of manufacture and installation, but have disadvantages. For example, the wear of the braided packing on the moving shaft or the valve rod in the radial direction is particularly large, the time is slightly long, the moving part of the equipment needs to replace the operating shaft due to the wear, and the extra investment of the equipment is increased; the woven packing seal is difficult to achieve zero leakage in a broad sense, namely, a certain amount of leakage exists in the woven packing seal, so that the possibility of waste gas dissipation is increased; the woven packing has short sealing life, the repair process is necessary to stop, and frequent replacement brings heavy work to production enterprises and economic loss caused by stopping. Prior art such as CN201820304524.3 discloses a stirring reaction kettle shaft seal device comprising: the packing box comprises a packing box body, a shaft sleeve, a sealing packing unit, a packing gland and a fixing device; the stuffing box body is sleeved on a stirring shaft of the stirring reaction kettle; a shaft sleeve and a sealing packing unit are further arranged between the packing box body and the stirring shaft, and the sealing packing unit is arranged at the top end of the shaft sleeve; a packing gland is arranged at the top end of the sealing packing unit; the packing gland is fixed on the packing box body through the fixing device; the sealing packing unit comprises a supporting ring, a pressing ring and at least one sealing ring, and the supporting ring, the sealing ring and the pressing ring are sequentially arranged; the cross section of the sealing ring is V-shaped, and the opening of the sealing ring faces the air flow direction. The V-shaped sealing ring device is simple in structure, and the service life of the sealing filler is prolonged to a certain extent, but the problem that the loss caused by large mechanical friction is difficult to compensate and the irritant gas escapes along with the progress of the polymerization reaction still exists.

Disclosure of Invention

The utility model aims to solve the problems of leakage of sealing ring of a stirring shaft, abrasion caused by packing sealing and leakage risk in the prior art, and provides a shaft seal structure of a stirring reaction kettle and the stirring reaction kettle, which have the effect of reducing the dissipation of irritant gas by reducing friction loss with the stirring shaft.

In order to achieve the above object, an aspect of the present utility model provides a shaft seal structure of a stirring reaction kettle, the shaft seal structure of the stirring reaction kettle comprising:

The stuffing box is provided with a sealing cavity for filling the mud-shaped stuffing, is sleeved on the stirring shaft and is connected with the stirring reaction kettle, and a stuffing layer filled with the mud-shaped stuffing is arranged in the sealing cavity;

And the filler feeding piece is connected with the filler box and communicated with the filler layer and is used for adding mud filler into the filler layer.

Optionally, the filler feeding member has a feeding hole and is provided with a valve as a mud filler feeding switch.

Optionally, the filler material feeding member is provided with a fastening portion thereon.

Optionally, the packing feeding piece is a rod-shaped body, the rod-shaped body is welded with the packing box, and the opened axial through hole is formed into a feeding hole.

Optionally, the mud filler filled in the filler layer comprises at least one of polytetrafluoroethylene fiber, powdered graphite, molybdenum disulfide, lithium-based grease and silicone oil.

Optionally, the top end of the packing box is provided with an opening, the shaft seal structure of the stirring reaction kettle further comprises a gland, and the gland is connected with the packing box through a bolt to compress materials in the sealing cavity.

Optionally, the shaft seal structure of the stirring reaction kettle comprises a support body, is arranged in the sealing cavity and sleeved on the stirring shaft, and comprises an upper support body and a lower support body which are arranged at intervals along the axial direction, wherein the area defined by the upper support body and the lower support body is formed into the filler layer filled with the mud filler.

Optionally, an annular flow channel for circulating heat exchange working medium is formed in the wall surface of the stuffing box, an outlet of the annular flow channel is formed in the upper portion of the stuffing box, and an inlet of the annular flow channel is formed in the lower portion of the stuffing box.

Optionally, a filler element is in communication with the filler layer throughout the annular flow passage.

The utility model also provides a stirring reaction kettle which is characterized by comprising the shaft seal structure of the stirring reaction kettle.

Through the technical scheme, compared with the prior art, the utility model has the following advantages:

1. The method realizes non-stop repair of the tightness of the reaction kettle, avoids frequent stopping and starting caused by replacement of the sealing filler, reduces quality fluctuation of materials (such as slurry) in the reaction kettle during stopping and starting, and reduces the production amount of solid waste.

2. The mud-shaped filler adopted by the utility model replaces the traditional solid filler, and the filler layer filled with the mud-shaped filler has the characteristics of good self-lubricity and small friction coefficient, and achieves the effect of reducing the escape of the irritant gas by reducing the friction loss with the stirring shaft.

Drawings

FIG. 1 is a schematic view showing a shaft seal structure of a stirring reaction vessel for explaining an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of the filler material feeding member of FIG. 1;

Fig. 3 is an enlarged view of circle D in fig. 2.

Description of the reference numerals

A circulating water inlet and B circulating water outlet

C gland supporting nut

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the present utility model, unless otherwise specified, terms such as "upper, lower, left, and right" and "upper, lower, left, and right" are used generically to refer to the upper, lower, left, and right illustrated in the drawings; "inner and outer" means inner and outer relative to the contour of the respective parts themselves. In the present utility model, "upper" means a position of 0-40% of the container from top to bottom, lower means a position of 0-40% of the container from bottom to top, and the remaining position is defined as a middle.

In the prior art, for example, the solid packing originally used in the one-step polymerization reaction continuous stirred tank reactor is widely used on equipment such as a rotary pump, a reciprocating pump, a stirrer and the like because of low price and convenient manufacturing and installation, but the abrasion is serious because of large friction force between the radial direction of the packing and a shaft or a valve rod, and a moving part of the equipment needs to replace an operating shaft due to abrasion. According to the different equipment models, different running workpieces are correspondingly matched with different stuffing boxes, so that a large amount of knitting stuffing with different specifications is reserved, and the stock is increased. The braided packing seals present a relatively high amount of leakage, causing environmental pollution. And the woven packing has short sealing life, the repair process is necessary to stop the operation, and frequent replacement brings heavy work to production enterprises and economic loss caused by stopping the operation.

The utility model can improve the problems and reduce the emission of the irritant gas on the basis of reducing the abrasion of the mechanical seal. Has popularization significance in the field of sealing structure improvement of continuous stirred tank reactors. In addition, the technology can be popularized and applied to carbon fiber precursor production, the quality of the stock solution is stabilized, and the significance is great under the current environment-friendly high-pressure situation.

As shown in fig. 1, the utility model discloses a shaft seal structure of a stirring reaction kettle, which comprises: a stuffing box 1 and a stuffing feeding element 4, wherein,

The stuffing box 1 is provided with a sealing cavity for filling the mud-shaped stuffing, the stuffing box 1 is sleeved on the stirring shaft 3 and is connected with the kettle body of the stirring reaction kettle, and a stuffing layer 13 filled with the mud-shaped stuffing is arranged in the sealing cavity;

the filler feeding member 4 is connected with the stuffing box 1 and communicated with the stuffing layer 13 for feeding the mud-like stuffing into the stuffing layer 13.

The shaft seal structure disclosed by the utility model can reduce the mechanical friction between the stirring shaft of the reaction kettle and the stirring planetary, and reduce the escape of harmful gases in the reaction process caused by filler loss. Meanwhile, the filling material is convenient to supplement in the later period, the operation period of the reaction kettle is prolonged, and the quality stability of the product is further improved.

As shown in fig. 1-3, in some embodiments of the utility model, the packing element 4 has a feed orifice 42 and is fitted with a valve 5, the valve 5 acting as a mud packing feed switch. Specifically, for example, a valve 5 is screwed with the filler feeding member 4 and communicates with the feeding hole 42, the valve is connected to a hydraulic gun, and a mud filler is hydraulically added to the filler layer 13.

In some embodiments of the present utility model, the feed opening 42 communicates with the middle of the packing layer 13.

In some embodiments of the utility model, the packing element 4 is provided as a rod-shaped body which is welded to the packing box 1 and which is provided with an axial through-hole which forms the feed opening.

In some embodiments of the utility model the packing element 4 is provided as a steel tube with one end welded to the outer wall of the packing box and the other end fitted with a valve 5, and the steel tube is fitted with a nut formed as a fastening part 41 of the packing element 4, which fastening part is provided for facilitating the application of a tool (e.g. a wrench), it being understood that the fastening part of the utility model is not limited to nuts only.

In some embodiments of the present utility model, the filler layer 13 is filled with a puddle-like filler comprising a puddle-like mixture of polytetrafluoroethylene fibers, powdered graphite, molybdenum disulfide, lithium-based grease, and silicone oil, such as the puddle-like filler brand CPS2804, which may be used in the present utility model.

In some embodiments of the utility model, the shaft seal structure of the stirring reaction kettle comprises a support body, wherein the support body is arranged in a sealing cavity and sleeved on the stirring shaft 3, and comprises an upper support body 11 and a lower support body 12 which are arranged at intervals along the axial direction, wherein the area defined by the upper support body 11 and the lower support body 12 is formed into a filler layer 13 filled with mud filler.

The support body mainly plays a role in supporting the mud-like filler and isolating the harmful gas in the reaction kettle, and in some embodiments of the utility model, the support body is mainly formed by processing a high-performance modified polytetrafluoroethylene bar, for example, a packing with the brand CPS8911 can be used as the support body of the utility model.

As shown in fig. 1, in some embodiments of the present utility model, the top end of the packing box 1 is provided with an opening, the shaft seal structure of the stirring reaction kettle further comprises a gland 2, and the gland 2 is connected with the packing box 1 through a bolt 21 to compress materials in the sealing cavity. Thus, during installation, the lower support body 12 can be placed in the sealing cavity of the stuffing box, then the mud-shaped stuffing is injected through the stuffing feeding piece 4, then the upper support body 11 is placed, and the sealing is performed through the gland 2 and the bolts 21.

In some embodiments of the present utility model, the bolts 21 between the gland 2 and the stuffing box 1 are provided with gland support nuts C, and it is understood that the number of gland support nuts C may be increased or decreased according to actual requirements to increase or decrease the volume of the stuffing layer.

To further enhance the sealing effect, in some embodiments of the present utility model, as shown in fig. 1, the gland 2 is mated with the upper support 11, and the mating surface is a tapered inclined surface. Therefore, on the basis of mud-shaped packing sealing, the sealing effect is further achieved through self-sealing performance of the mutually matched conical inclined planes, and the sealing effect of the reaction kettle is better under the double sealing effect.

In some embodiments of the present utility model, an annular flow channel 14 for circulating a heat exchange medium (e.g., water) is formed in a wall surface of the stuffing box 1, a circulating water outlet B of the annular flow channel 14 is formed at an upper portion of the stuffing box 1, and a circulating water inlet a of the annular flow channel 14 is formed at a lower portion of the stuffing box 1. Therefore, heat is taken away through the heat exchange working medium, so that the temperature control purpose is achieved.

In some embodiments of the utility model, as shown in fig. 1, the packing element 4 communicates with the packing layer 13 through an annular flow channel 14. For example, the packing material feeding element 4 may be configured as a seamless steel pipe, in which a feed hole with a diameter D is drilled in the axial direction, the outer diameter D of the seamless steel pipe may be 3 times that of the seamless steel pipe, and the seamless steel pipe may be welded (it will be understood that the welding needs to ensure that the heat exchange medium in the annular flow channel 14 does not leak) through the annular flow channel 14 on the outer wall of the packing box 1, and the feed hole communicates with the packing layer.

The utility model further discloses a stirring reaction kettle which comprises the shaft seal structure of the stirring reaction kettle.

In some embodiments of the utility model, the stirring reaction kettle can be provided with liquid level and pressure detection instruments in the prior art, and an alarm value is set, so that an alarm can be timely prompted once the sealing is abnormal.

The advantages of the present utility model will be described below by way of example in which the shaft seal structure of the stirred tank reactor is installed in the one-step polymerization tank, but the present utility model is not limited thereto.

Example 1

The stirring shaft of the one-step polymerization kettle is sealed by adopting a shaft seal structure shown in the figures 1-3, wherein the support body is formed by packing with the brand of CPS8911, and the mud-like filler (brand of CPS 2804) of the filler layer is a cement-like mixture formed by combining polytetrafluoroethylene fiber, powdery graphite, molybdenum disulfide, lithium-based grease, silicone oil and the like.

The filler installation is carried out according to the following steps:

(1) Placing the lower support body 12 into the sealing cavity of the stuffing box 1;

(2) Filling mud-like filler into the sealing cavity;

(4) Placing the upper support body 11 into a sealing cavity, closing the sealing cavity by a gland 2 and pre-tightening;

(5) The tightness is detected by adopting an bubbling method in the prior art, a hydraulic gun is connected with a valve 5, and mud filler is manually added for lubrication and sealing.

(6) The gland 2 is additionally connected with the stuffing box 1 through bolts;

(7) In order to ensure the circulation of the heat exchange medium (water) itself, a forced circulation pump is provided.

(8) The polymerization kettle is provided with a pressure detection instrument and meter, an alarm value is set, and an alarm can be timely prompted once the sealing is abnormal.

The on-site VOC of this example was about 150ppm (meeting petrochemical system standards: stirring seal leakage value VOC less than 1000 ppm).

Comparative example

Unlike example 1, the one-step polymerization reaction employed a continuous stirred tank reactor of the prior art, and the shaft seal device disclosed in CN201820304524.3 employed a solid high-temperature and high-pressure resistant packing (brand CPS 8911) as the stirring shaft seal packing, the leakage rate at the packing was always in an upward trend, and the effect of controlling the dissipation of the irritant gas in the material was not ideal. Wherein the VOC emission of the polymerization kettle reaches 5000ppm.

The utility model uses mud filler to replace packing filler, optimizes the stirring sealing structure of the polymerization kettle, enhances the sealing performance, prolongs the service life and achieves micro leakage (meets the petrochemical system standard that the VOC value of the stirring sealing leakage is less than 1000 ppm).

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a plurality of simple variants of the technical proposal of the utility model can be carried out, comprising that each specific technical feature is combined in any suitable way, and in order to avoid unnecessary repetition, the utility model does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (10)

1. The utility model provides a stirring reation kettle's bearing seal structure, its characterized in that, stirring reation kettle's bearing seal structure includes:

The stuffing box (1) is provided with a sealing cavity for filling the mud-shaped stuffing, the stuffing box (1) is sleeved on the stirring shaft (3) and is connected with the stirring reaction kettle, and a stuffing layer (13) filled with the mud-shaped stuffing is arranged in the sealing cavity;

And the filler feeding piece (4) is connected with the filler box (1) and communicated with the filler layer (13) and is used for feeding mud filler into the filler layer (13).

2. The shaft seal structure of a stirred tank reactor according to claim 1, characterized in that the filler feeding member (4) has a feeding hole (42) and is provided with a valve (5), and the valve (5) is used as a mud filler feeding switch.

3. Shaft seal structure of a stirred tank reactor according to claim 1 or 2, characterized in that the filler addition (4) is provided with a fastening part (41).

4. A shaft seal structure of a stirring reaction kettle according to claim 3, characterized in that the filler feeding piece (4) is arranged as a rod-shaped body, and the rod-shaped body is welded with the filler box (1) and an axial through hole is formed as a feeding hole.

5. The shaft seal structure of a stirring reaction kettle according to claim 1, wherein the mud-like filler filled in the filler layer (13) comprises at least one of polytetrafluoroethylene fiber, powdered graphite, molybdenum disulfide, lithium-based grease and silicone oil.

6. The shaft seal structure of the stirring reaction kettle according to claim 1, wherein the top end of the stuffing box (1) is provided with an opening, the shaft seal structure of the stirring reaction kettle further comprises a gland (2), and the gland (2) is connected with the stuffing box (1) through a bolt (21) to compress materials in the sealing cavity.

7. The shaft seal structure of a stirring reaction kettle according to claim 1, characterized in that the shaft seal structure of the stirring reaction kettle comprises a support body, is arranged in the sealing cavity and sleeved on the stirring shaft (3), and comprises an upper support body (11) and a lower support body (12) which are arranged at intervals along the axial direction, wherein the area defined by the upper support body (11) and the lower support body (12) is formed into the filler layer (13) filled with mud filler.

8. The shaft seal structure of the stirring reaction kettle according to claim 1, wherein an annular flow passage (14) for circulating heat exchange working medium is formed in the wall surface of the stuffing box (1), an outlet of the annular flow passage (14) is formed in the upper portion of the stuffing box (1), and an inlet of the annular flow passage (14) is formed in the lower portion of the stuffing box (1).

9. The shaft seal structure of the stirring reaction kettle according to claim 8, wherein a filler feeding piece (4) penetrates through the annular flow passage (14) and is communicated with the filler layer (13).

10. A stirred tank reactor, characterized in that it comprises a shaft seal structure of the stirred tank reactor according to any one of claims 1 to 9.