A kind of plate structure of mechanical seal oil seal of bulk method prepolymerization kettle

Abstract

The utility model relates to a kind of plate structure of mechanical seal oil seal of body method prepolymerization kettle, and it is related to technical field, technical scheme is: including cover and bush, cover and bush between being provided with connecting port, annular sealing gasket is provided in connecting port, cover is detachably connected with baffle, the lower surface of baffle is connected with limit block.The beneficial effects of the technical solution are: by the setting of baffle and limit block, limit block directly blocks the direct contact of oil seal and particulate matter, blocks the wear of sealing gasket by internal particles, delays the wear of oil seal, extends the use time of machine seal, reduces the frequency of replacing machine seal, reduces the labor intensity of relevant staff, and after the reduction of exposed space, PVC monomer polymerization, plasticization and the like can be reduced into oil seal part, reduce the wear and erosion to oil seal, so as to extend the use time of mechanical seal, reduce the frequency of replacement, reduce equipment maintenance cost, improve the stability and continuity of production.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a pressure plate structure for a mechanical seal oil seal of a prepolymerization reactor using a body-based method. Background Technology

[0002] Industrial production methods for polyvinyl chloride (PVC) resin include bulk polymerization. Bulk-polymerized PVC resin meets food-grade hygiene requirements; it has high purity, low water absorption, and is not prone to moisture absorption during long-term storage; for the same scale of equipment, the investment is about 20% lower than that of the suspension polymerization process. Bulk polymerization PVC production technology has strong development advantages and a promising future.

[0003] Bulk polymerization is divided into prepolymerization and polymerization. Prepolymerization reactors involve high pressure, high rotation speed, and numerous process variations. During the prepolymerization reaction inside the reactor, the vaporized chemical complex (VCM) participating in the reaction is in a gaseous state, forming an explosive mixture with air. The explosion limits are 4% to 22% (by volume), and it is even more prone to explosion under pressure. Furthermore, vinyl chloride is a toxic substance, and long-term inhalation can cause liver cancer. Therefore, the sealing function of the mechanical seal in the bulk prepolymerization reactor is particularly important.

[0004] During the operation of the bulk prepolymerization reactor, the stirring shaft drives the bushing to rotate continuously at high speed. Since the bushing is a dynamic component, while the gland is fixed to the stationary reactor body, a certain clearance inevitably exists between them. Under long-term high-speed operation, this dynamic-static joint is prone to widening of the clearance due to wear, thermal deformation, or installation deviations, forming a potential leakage channel and affecting the normal operation of the equipment. Furthermore, during PVC production, some vinyl chloride monomer enters the labyrinth seal grease channel and undergoes a self-polymerization reaction, producing a large amount of particulate matter that eventually accumulates in the cavity at the connection between the mechanical seal and the labyrinth seal. This particulate matter directly contacts the mechanical seal oil seal at this location. Accelerated wear of the oil seal during the operation of the prepolymerization reactor leads to the particulate matter entering the mechanical seal cavity, causing spring failure and ultimately resulting in mechanical seal leakage. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of current PVC production processes, where particulate matter directly contacts the mechanical seal oil seal, causing the particulate matter to enter the mechanical seal cavity, resulting in spring failure and thus mechanical seal leakage. Therefore, this invention proposes a pressure plate structure for the mechanical seal oil seal of a prepolymerization reactor using a body-based method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A pressure plate structure for a mechanical seal oil seal of a prepolymerization reactor using a bulk method includes a cover plate and a bushing. A connection port is provided between the cover plate and the bushing, and an annular sealing gasket is provided inside the connection port. A baffle is detachably connected to the cover plate, and a limit block is connected to the lower surface of the baffle. The limit block is located above the connection port, and a gap is provided between the baffle and the bushing.

[0007] The compression of the annular sealing gasket by the limiting block improves the sealing effect. At the same time, the setting of the limiting block and the baffle can seal the gap between the cover plate and the bushing again, reduce the back-and-forth movement and friction of the annular sealing gasket, and block large particles of material, reducing the wear of the annular sealing gasket by the material and reducing the need for oil seal replacement.

[0008] Preferably, the upper surface of the cover plate is provided with multiple threaded blind holes, and the baffle plate is provided with mounting holes corresponding to the threaded blind holes. Bolts are installed in the mounting holes, and the lower end of the bolts extends into the threaded blind holes.

[0009] Bolts are used to evenly fix the baffle to the cover plate.

[0010] Preferably, both the limiting block and the baffle are made of stainless steel and are integrally formed.

[0011] Preferably, the gap between the baffle and the bushing is 1mm-3mm.

[0012] The baffle and limit block are designed to block larger particles and reduce wear on the annular sealing gasket.

[0013] Preferably, the annular sealing gasket is made of rubber material.

[0014] Preferably, the annular sealing gasket has a placement opening, and a spring is installed inside the placement opening.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting the baffle and the limiting block, the limiting block directly blocks the direct contact between the oil seal and the particulate matter, prevents the internal particles from wearing the sealing gasket, delays the wear of the oil seal, extends the service life of the mechanical seal, reduces the frequency of mechanical seal replacement, reduces the labor intensity of relevant personnel, and after the exposure space is reduced, it can reduce the entry of PVC monomers, plastics, etc. into the oil seal part, reduce the wear and corrosion of the oil seal, thereby extending the service life of the mechanical seal, reducing the frequency of replacement, reducing equipment maintenance costs, and improving the stability and continuity of production. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of a specific embodiment of the present utility model.

[0018] Figure 2This is a top view of a specific embodiment of the present utility model.

[0019] Figure 3 for Figure 1 Enlarged view of point A.

[0020] Figure 4 This is a schematic diagram of the baffle structure in a specific embodiment of the present invention.

[0021] In the diagram: 1. Baffle; 2. Limiting block; 3. Spring; 4. Bushing; 5. Annular sealing gasket; 6. Bolt; 7. Cover plate. Detailed Implementation

[0022] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] Reference Figures 1-4 A pressure plate structure for a mechanical seal oil seal of a prepolymerization reactor using a bulk method includes a cover plate 7 and a bushing 4. A connection port is provided between the cover plate 7 and the bushing 4. An annular sealing gasket 5 is placed inside the connection port to seal it. A baffle 1 is detachably connected to the cover plate 7. A limiting block 2 is connected to the lower surface of the baffle 1 and is located above the connection port. A gap of 1mm-3mm is provided between the baffle 1 and the bushing 4. The limiting block 2 presses on the annular sealing gasket 5, which is made of rubber. After being compressed, the rubber material adheres evenly to the bushing 4 and the cover plate 7, improving the sealing performance. The sealing reliability and durability are ensured, while the limiting block 2 reduces the back-and-forth friction of the annular sealing gasket 5. Both the limiting block 2 and the baffle 1 are made of stainless steel and are integrally formed. When the limiting block 2 is subjected to pre-tightening force, it is not easily deformed or twisted, which can distribute the clamping force more evenly across the entire sealing gasket surface, avoiding local crushing or insufficient force, thereby improving the sealing reliability. The stainless steel material extends the service life of the limiting block 2 and the baffle 1. At the same time, the limiting block 2 and the baffle 1 are fixed to the baffle 1 by bolts 6. During operation, the baffle 1 and the limiting block 2 can block large particles of material in the polymerization reactor, thereby reducing the wear of the material on the annular sealing gasket 5 and reducing the need for oil seal replacement.

[0024] Reference Figures 1-3The upper surface of the cover plate 7 is provided with multiple threaded blind holes, and the baffle 1 is provided with mounting holes corresponding to the threaded blind holes. Bolts 6 are installed in the mounting holes, and the lower end of the bolts 6 extends into the threaded blind holes. The bolts 6 fix the cover plate 7 evenly on the baffle 1.

[0025] Reference Figure 3 The annular sealing gasket 5 is provided with a placement port, and a spring 3 is installed in the placement port. Both the annular sealing gasket 5 and the spring 3 are oil seal materials. The spring 3 can continuously provide elastic force to push the sealing lip or sealing surface to fit tightly against the mating surface, ensuring long-term stability of the sealing force. In addition, the spring 3 has good compensation ability, can adapt to this change, and continuously adjust the force applied to the sealing lip to maintain the integrity of the seal.

[0026] In use, place the annular sealing gasket 5 in the connection port between the connecting cover plate 7 and the bushing 4, and then place the baffle 1 and the limiting block 2 above the connection port. The limiting block 2 squeezes the annular sealing gasket 5. At the same time, the distance between the baffle 1 and the limiting block 2 is 1-3mm. During operation, it can facilitate the rotation of the bushing 4 and block large particles in the polymerization reactor, reducing the wear of the annular sealing gasket 5. Then, fix the baffle 1 to the cover plate 7 with bolts 6.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure plate structure for a mechanical seal oil seal in a bulk prepolymerization reactor, characterized in that: It includes a cover plate (7) and a bushing (4). A connection port is provided between the cover plate (7) and the bushing (4). An annular sealing gasket (5) is provided in the connection port. A baffle (1) is detachably connected to the cover plate (7). A limit block (2) is connected to the lower surface of the baffle (1). The limit block (2) is located above the connection port. A gap is provided between the baffle (1) and the bushing (4).

2. The pressure plate structure of the mechanical seal oil seal of the prepolymerization reactor according to claim 1, characterized in that: The upper surface of the cover plate (7) is provided with multiple threaded blind holes, and the baffle plate (1) is provided with mounting holes corresponding to the threaded blind holes. A bolt (6) is installed in the mounting hole, and the lower end of the bolt (6) extends into the threaded blind hole.

3. The pressure plate structure of the mechanical seal oil seal of the prepolymerization reactor according to claim 1, characterized in that: Both the limiting block (2) and the baffle (1) are made of stainless steel and are integrated into one piece.

4. The pressure plate structure of the mechanical seal oil seal of the prepolymerization reactor according to claim 1, characterized in that: The gap between the baffle (1) and the bushing (4) is 1mm-3mm.

5. The pressure plate structure of the mechanical seal oil seal of the prepolymerization reactor according to claim 1, characterized in that: The annular sealing gasket (5) is made of rubber material.

6. The pressure plate structure of the mechanical seal oil seal of the prepolymerization reactor according to claim 1, characterized in that: The annular sealing gasket (5) has a placement opening, and a spring (3) is installed inside the placement opening.

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