Split mechanical seal structure of powder stirring kneading machine convenient to disassemble and assemble

Abstract

The utility model relates to the technical field related to sealing, in particular to a split type mechanical seal structure of a powder stirring kneading machine convenient to disassemble and assemble. The right side of the supporting seat is connected with a cooling jacket; a spiral shaft sleeve is mounted at the lower part of the cooling jacket; a spiral structure is processed on the peripheral surface of the spiral shaft sleeve; a threaded structure is machined on the surface, in contact with the spiral shaft sleeve, of the cooling jacket and is in butt joint with the spiral structure of the spiral shaft sleeve; a static ring seat is in butt joint with the right side of the cooling jacket; a nitrogen opening is formed in the surface of the static ring seat; an oil seal is arranged at the lower part of the static ring seat; a groove is formed in the right side of the static ring seat, and a static ring is mounted in the groove; a movable ring assembly is butted to the right side of the static ring; a driving ring is mounted on the right side of the movable ring assembly through an adjusting screw; according to the split type mechanical seal structure of the powder stirring kneading machine convenient to disassemble and assemble, the sealing reliability can be improved, the service life can be prolonged, and the maintenance cost and time can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field related to sealing, and in particular relates to a split-type machine seal structure of a powder mixing and kneading machine which is easy to disassemble and assemble. Background Art

[0002] At present, the powder mixing (high temperature) kneading machine adopts the traditional packing sealing method. Usually, the packing is a soft packing, which is stacked layer by layer. Through the extrusion of spring bolts, the gap between the main shaft and the outer surface of the frame (hereinafter referred to as the wall panel) is filled to achieve the purpose of sealing.

[0003] A packing mechanical seal usually consists of three parts, which are, from left to right and from top to bottom, a packing tube (stationary relative to the wall panel), packing (packing), a push ring (stationary relative to the wall panel), and a spring bolt.

[0004] This type of mechanical seal has three sealing points. The gap between the packing tube and the wallboard is sealed by the bottom surface of the packing tube and the plane of the wallboard. In addition, there are gaps between the main shaft and the packing, and between the packing and the inner surface of the packing tube cavity, which are completely sealed by the packing. Although this type of mechanical seal has low cost and simple structure, due to the improvement of technology, the requirements for sealing are getting higher and higher. Traditional mechanical seals can no longer meet daily production needs. Utility Model Content

[0005] The utility model aims to provide a split-type mechanical seal structure of a powder mixing and kneading machine which is easy to disassemble and assemble and can improve the sealing reliability, increase the service life, and reduce the maintenance cost and time.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a split-type mechanical seal structure of a powder mixing and kneading machine that is easy to disassemble and assemble, comprising a cooling jacket, a spiral sleeve, an oil seal, a static ring, a static ring seat, a dynamic ring assembly, a driving ring, an adjusting screw, a supporting seat, a nitrogen port and a main shaft, wherein a supporting seat is installed at the left end of the main shaft; a cooling jacket is connected to the right side of the supporting seat; a spiral sleeve is installed at the lower part of the cooling jacket; a spiral structure is machined on the outer circumferential surface of the spiral sleeve; a threaded structure is machined on the surface where the cooling jacket contacts the spiral sleeve and is butt-jointed with the spiral structure of the spiral sleeve; a static ring seat is butt-jointed on the right side of the cooling jacket; a nitrogen port is provided on the surface of the static ring seat; an oil seal is provided at the lower part of the static ring seat; a groove is provided on the right side of the static ring seat and a static ring is installed in the groove; a dynamic ring assembly is butt-jointed on the right side of the static ring; a driving ring is installed on the right side of the dynamic ring assembly through an adjusting screw.

[0007] As a further improvement of the utility model, a jacket sealing ring is installed between the cooling jacket and the support seat.

[0008] As a further improvement of the utility model, a stationary ring sealing ring is installed between the stationary ring seat and the cooling jacket.

[0009] As a further improvement of the utility model, a dynamic ring sealing ring is embedded and installed in the lower part of the dynamic ring assembly.

[0010] As a further improvement of the utility model, a stopper is installed on the lower part of the right side wall of the dynamic ring assembly through a fastening bolt; the lower end of the stopper blocks the installation opening position of the dynamic ring sealing ring.

[0011] As a further improvement of the utility model, transmission screws are installed at annular intervals between the dynamic ring assembly and the drive ring.

[0012] Compared with the prior art, the beneficial effects of the utility model are: the technical scheme can effectively solve the problem of powder extrusion in the existing process; the leakage mode of dust is different from that of liquid, most of it is sprayed out from the gaps and can easily diffuse in the air, which effectively eliminates safety hazards.

[0013] This technical solution can meet the requirements of the working temperature; too high working temperature will not only accelerate the aging of the mechanical seal, but may even cause it to fail. The cooling component can quickly cool down and at the same time extend the service life of the mechanical seal.

[0014] The equipment of this technical solution is easy to install; all components adopt a split-petal structure (axisymmetrically divided into halves), which can be installed quickly and conveniently, easily meet installation requirements, and the simple structure allows people to quickly get started with installation.

[0015] This technical solution can effectively improve the sealing effect; compared with the traditional packing mechanical seal, under the same conditions, the sealing effect is far better than the existing technology. And it can adapt to various working conditions very well, with very low requirements for the kneading machine itself, and the adaptation rate is as high as 90%.

[0016] This technical solution extends the service life of metal parts to more than 3 years. The optimized structure makes it almost frictionless and interferenceless between metal parts, and also provides a good working environment for screws and springs. The wearing parts include packing and O-rings. Due to the cooling of the cooling assembly, the service life of both can reach more than 8 months. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] In the figure: 1. Jacket sealing ring; 2. Cooling jacket; 3. Spiral sleeve; 4. Stationary ring sealing ring; 5. Oil seal; 6. Stationary ring; 7. Stationary ring seat; 8. Dynamic ring assembly; 9. Dynamic ring sealing ring; 10. Drive ring; 11. Adjusting screw; 12. Transmission screw; 13. Support seat; 14. Nitrogen port; 15. Stopper; 16. Fastening bolt; 17. Spindle. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 The utility model provides a technical solution: a split-type mechanical seal structure of a powder mixing and kneading machine that is easy to disassemble and assemble, comprising a cooling jacket 2, a spiral sleeve 3, an oil seal 5, a stationary ring 6, a stationary ring seat 7, a dynamic ring assembly 8, a driving ring 10, an adjusting screw 11, a support seat 13, a nitrogen port 14 and a main shaft 17, wherein the left end of the main shaft 17 is equipped with the support seat 13; the right side of the support seat 13 is connected to the cooling jacket 2; the lower part of the cooling jacket 2 is equipped with a spiral sleeve 3; the outer circumferential surface of the spiral sleeve 3 is reinforced The cooling jacket 2 has a spiral structure; a threaded structure is processed on the surface where the cooling jacket 2 contacts the spiral sleeve 3 and is butt-jointed with the spiral structure of the spiral sleeve 3; a stationary ring seat 7 is butt-jointedly mounted on the right side of the cooling jacket 2; a nitrogen port 14 is provided on the surface of the stationary ring seat 7; an oil seal 5 is provided on the lower part of the stationary ring seat 7; a groove is provided on the right side of the stationary ring seat 7 and a stationary ring 6 is installed in the groove; a dynamic ring assembly 8 is butt-jointedly mounted on the right side of the stationary ring 6; a drive ring 10 is installed on the right side of the dynamic ring assembly 8 through an adjusting screw 11.

[0021] A jacket sealing ring 1 is installed between the cooling jacket 2 and the support seat 13; a stationary ring sealing ring 4 is installed between the stationary ring seat 7 and the cooling jacket 2; and a dynamic ring sealing ring 9 is embedded and installed at the lower part of the dynamic ring assembly 8.

[0022] A stopper 15 is installed at the lower part of the right side wall of the dynamic ring assembly 8 through a fastening bolt 16; the lower end of the stopper 15 blocks the installation opening position of the dynamic ring sealing ring 9; and a transmission screw 12 is also installed at an annular interval between the dynamic ring assembly 8 and the drive ring 10.

[0023] Due to the complex working conditions of the kneading machine, the production of different types of materials will lead to different axial runouts and cause wear on the main shaft. Therefore, general mechanical seals cannot meet the working conditions and cannot seal. Even if there are specially customized mechanical seals, they are not popularized due to extremely short service life, high cost, and non-universality. However, it is undeniable that the traditional mechanical seal structure has excellent sealing performance and long service life. Therefore, the sealing mechanism of this technical solution is developed under this background.

[0024] Ordinary mechanical seals rely on the friction between the end faces to produce a sealing effect. Ordinary mechanical seal dynamic and static rings are mostly made of graphite or silicon carbide. Usually, the shaft diameter of the kneading machine is about 200 mm. The huge size brings the problem of expensive cost and extremely high process requirements, and axial runout can easily damage these rings. In order to solve this technical problem, we have simplified this series of mechanical seals into four parts: the first part is the cooling component; the second part is the static ring component; the third part is the dynamic ring component; and the fourth part is the drive component.

[0025] The first thing to solve is the high temperature problem: To solve this problem, we combined the flushing structure of the mechanical seal and installed a cooling component at the gap between the wall panel and the main shaft where the temperature is the highest. In order to facilitate installation, the cooling component is divided into two parts, the cooling jacket and the spiral sleeve. The cavity in the cooling jacket continuously circulates water to take away the heat, and the flushing liquid will not leak, and condensed water will not be generated to pollute the medium. At the same time, many spiral structures are designed between the cooling jacket and the spiral sleeve cavity to increase the surface area, improve the heat dissipation efficiency, and reduce the temperature by at least 20 degrees Celsius in a short period of time.

[0026] Occasionally, some powder will overflow from the cavity between the cooling jacket and the spiral sleeve. We seal this leakage point through the static ring assembly. By setting a sealing ring on the left side and slotting on the right side, we use the packing as the friction surface. In this way, the static ring friction surface can withstand some deformation and provide good compensation; the dynamic ring friction surface is chrome-plated to improve the hardness of the friction surface. The cooling assembly and the static ring assembly are fixed on the wallboard and are stationary relative to the wallboard to prevent dust leakage to the greatest extent. The packing is in contact with the dynamic ring. Since the packing will be squeezed and deformed, it is necessary to continuously apply a radial force to the dynamic ring. The drive assembly contains evenly distributed springs. When installed on the main shaft, it will hold the drive ring tightly on the main shaft. The drive ring and the dynamic ring are connected by transmission screws and are stationary relative to the main shaft. The drive ring will always remain in the same radial position of the main shaft, and the spring force is always applied to the dynamic ring. At this time, no matter what kind of deformation the packing occurs, it will be firmly squeezed in the static ring assembly to achieve a good sealing effect.

[0027] After installation, the cooling assembly is responsible for cooling the entire mechanical seal system. The stationary ring seat is next to the cooling assembly. The ring surface (friction surface) is composed of packing. The dynamic ring is driven by the driving ring and is relatively stationary with the shaft. The spring force provided by the driving ring continuously rubs against the friction surface of the stationary ring (the sealing principle is the same as that of traditional mechanical seals). This is the working state of this series of mechanical seals.

[0028] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A split-type mechanical seal structure of a powder mixing and kneading machine that is easy to disassemble and assemble, characterized in that: The invention comprises a cooling jacket (2), a spiral sleeve (3), an oil seal (5), a stationary ring (6), a stationary ring seat (7), a dynamic ring assembly (8), a driving ring (10), an adjusting screw (11), a support seat (13), a nitrogen port (14) and a main shaft (17), wherein the support seat (13) is installed at the left end of the main shaft (17); the cooling jacket (2) is connected to the right side of the support seat (13); the spiral sleeve (3) is installed at the lower part of the cooling jacket (2); the outer peripheral surface of the spiral sleeve (3) is processed with a spiral structure; between the cooling jacket (2) and the spiral sleeve (3), a spiral structure is formed; and between the cooling jacket (2) and the spiral sleeve (3), a spiral structure is formed. The contact surface of the shaft sleeve (3) is processed with a threaded structure and is butt-jointed with the spiral structure of the spiral shaft sleeve (3); a stationary ring seat (7) is butt-jointedly mounted on the right side of the cooling jacket (2); a nitrogen port (14) is provided on the surface of the stationary ring seat (7); an oil seal (5) is provided at the bottom of the stationary ring seat (7); a groove is provided on the right side of the stationary ring seat (7) and a stationary ring (6) is installed in the groove; a dynamic ring assembly (8) is butt-jointedly mounted on the right side of the stationary ring (6); a drive ring (10) is installed on the right side of the dynamic ring assembly (8) via an adjusting screw (11).

2. The split-type mechanical seal structure of the powder mixing and kneading machine that is easy to disassemble and assemble according to claim 1 is characterized in that: A jacket sealing ring (1) is installed between the cooling jacket (2) and the support seat (13).

3. The split-type mechanical seal structure of the powder mixing and kneading machine that is easy to disassemble and assemble according to claim 1 is characterized in that: A stationary ring sealing ring (4) is installed between the stationary ring seat (7) and the cooling jacket (2).

4. The split-type mechanical seal structure of the powder mixing and kneading machine that is easy to disassemble and assemble according to claim 1 is characterized in that: A dynamic ring sealing ring (9) is embedded and installed in the lower part of the dynamic ring assembly (8).

5. The split-type mechanical seal structure of the powder mixing and kneading machine that is easy to disassemble and assemble according to claim 4 is characterized in that: A stopper (15) is installed at the lower part of the right side wall of the dynamic ring assembly (8) via a fastening bolt (16); the lower end of the stopper (15) blocks the installation opening position of the dynamic ring sealing ring (9).

6. The split-type mechanical seal structure of the powder mixing and kneading machine that is easy to disassemble and assemble according to claim 1 is characterized in that: Transmission screws (12) are also installed at an annular interval between the dynamic ring assembly (8) and the drive ring (10).

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