Stirring shaft sealing connection structure for neat paste spraying equipment
By employing an upper sealing cover, a lower sealing cover, and a mechanical seal structure in a paste spraying equipment with a mixing motor located at the bottom of the mixing tank, combined with a cooling system, the sealing problem between the mixing shaft, the mixing tank, and the motor is solved, achieving effective sealing and extending service life.
Patent Information
- Application Number
- CN202520486895.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-03-19
AI Technical Summary
The vertical installation of the mixing motor in existing mixing tanks results in a high equipment height, making feeding difficult. Furthermore, the common sealing structures have poor corrosion and wear resistance in cement slurry environments, leading to a short service life and the potential for slurry seepage that could seize the mixing shaft or contaminate the motor.
Design a sealing connection structure for the mixing shaft of a paste spraying equipment, including an upper sealing cover, a lower sealing cover, a connecting flange and a mechanical seal. The mechanical seal and cooling system achieve effective sealing between the mixing shaft and the mixing tank, and between the mixing shaft and the motor, and utilize cooling water to extend the service life of the sealing structure.
This achieves an effective seal between the mixing shaft, the mixing tank, and the motor, preventing slurry seepage, extending the service life of the sealing structure, protecting the bearings and motor, and improving the reliability and durability of the equipment.
Smart Images
Figure CN223725408U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cement paste spraying equipment technical field, concretely point to a kind of stirring shaft sealing connection structure for cement paste spraying equipment. BACKGROUND
[0002] The durability of prestressed high-strength steel wire wound on PCCP pipe core directly affects the structural safety of PCCP. The water-cement ratio of cement paste on the surface of the steel wire is 0.625, which has strong viscosity and fast setting speed. The mixed mud begins to set after more than 45 minutes. Therefore, the cement paste is usually made on site using a mixing barrel.
[0003] Currently, the mixing motor of the mixing barrel on the market is generally vertically arranged above the mixing barrel, which results in a high overall height of the equipment. At the same time, it is difficult to add materials to the mixing barrel because the material adding equipment will interfere with the mixing motor in space. If the mixing motor is arranged below the mixing barrel, it is necessary to avoid the situation that the mixing shaft is locked due to the infiltration of slurry and the mixing motor is contaminated. The general sealing structure, such as o-ring sealing and skeleton shaft sealing, has poor corrosion resistance and wear resistance in the cement paste mixing environment, and has a short service life. Therefore, technical personnel need to design a stirring shaft sealing connection structure suitable for the lower arrangement of the mixing motor. SUMMARY
[0004] The technical problem to be solved by the utility model is to provide a stirring shaft sealing connection structure for cement paste spraying equipment, which can seal between the stirring shaft and the mixing barrel and between the stirring shaft and the motor when the mixing barrel mixing motor is arranged below, effectively avoiding the problem that the mixing shaft is locked due to the infiltration of slurry or the motor is contaminated, has good sealing effect, and prolongs the service life of the sealing structure.
[0005] To solve the above technical problems, the technical solution adopted by the utility model is as follows: a stirring shaft sealing connection structure for cement paste spraying equipment, comprising an upper sealing cover, a lower sealing cover, a connecting flange, and a mechanical seal. The top of the upper sealing cover is connected to the bottom of the mixing barrel by bolts, and a sealing gasket is arranged at the connection between the upper sealing cover and the mixing barrel. The lower sealing cover is assembled on the upper sealing cover. The top of the connecting flange is detachably connected to the bottom of the lower sealing cover by bolts. The bottom of the connecting flange is detachably connected to the flange of the motor by bolts. The output shaft of the motor is coaxially connected to the stirring shaft through a shaft coupling. The stirring shaft extends into the mixing barrel to connect the stirring blades after passing through the lower sealing cover and the upper sealing cover in sequence. The stirring shaft is rotatably connected to the lower sealing cover through a bearing. The mechanical seal is arranged on the stirring shaft. The stirring shaft is sealed and connected to the upper sealing cover and the lower sealing cover by two mechanical seals, respectively.
[0006] Preferably, a cooling system is arranged in the upper sealing cover to cool the two mechanical seals and the stirring shaft.
[0007] Preferably, the cooling system comprises a first water storage cavity, a first cooling water channel, a second cooling water channel, a water inlet, a water outlet, a second water storage cavity and a third water storage cavity; the water inlet is connected to cooling water, one end of the first cooling water channel is connected to the water inlet and the other end is connected to the first water storage cavity; one end of the second cooling water channel is connected to the water outlet and the other end is connected to the third water storage cavity; the first water storage cavity and the third water storage cavity are both connected to the second water storage cavity, and the water in the second water storage cavity cools the mechanical seal and the stirring shaft.
[0008] Preferably, the first water storage cavity is an annular cavity; the upper sealing cover is provided with a cylindrical cavity opening downward, and the lower sealing cover is sealingly connected to the upper sealing cover by a sealing ring, so that the cylindrical cavity forms a closed second water storage cavity.
[0009] Preferably, the stirring shaft is provided with a shaft table, the shaft table is located in the second water storage cavity, and a mechanical seal is arranged between the upper surface of the shaft table and the upper sealing cover, and a mechanical seal is arranged between the lower surface of the shaft table and the lower sealing cover.
[0010] Preferably, the mechanical seal is composed of a static ring and a dynamic ring, the stirring shaft passes through the center of the static ring and the dynamic ring, the dynamic ring rotates with the stirring shaft, and the static ring does not rotate; the static ring comprises a rubber pad and a first alloy ring, the dynamic ring comprises a second alloy ring, a rubber ring, a retaining ring, a spring and a spring tray, the rubber pad is embedded on the upper sealing cover or the lower sealing cover, and the first alloy ring is embedded on the rubber pad; the upper end surface of the second alloy ring abuts against the lower end surface of the first alloy ring, the second alloy ring is embedded on the rubber ring, the rubber ring is embedded in the retaining ring, the spring is sleeved on the outside of the retaining ring, one end of the spring is connected to the spring tray and the other end is connected to the lower end surface of the outer boss of the retaining ring, and the spring tray is installed on the stirring shaft; the rubber ring realizes axial sealing of the stirring shaft, the rubber pad realizes sealing of the upper sealing cover or the lower sealing cover under the elastic force of the spring, and the first alloy ring and the second alloy ring realize sealing of the abutting end surfaces during mutual rotation.
[0011] The beneficial effects of the above technical solutions are as follows:
[0012] 1、The application sets a mechanical seal between the stirring shaft and the upper sealing cover, realizing the effective sealing of the stirring shaft and the stirring barrel; a mechanical seal is set between the stirring shaft and the lower sealing cover, realizing the effective sealing of the stirring shaft and the motor. The mechanical seal is divided into a static ring and a dynamic ring. In actual use, the rubber pad in the static ring realizes the axial and radial sealing of the upper sealing cover under the spring elastic force, and the rubber ring in the dynamic ring realizes the axial sealing of the stirring shaft. During the stirring process of the stirring barrel, the static ring is stationary, and the dynamic ring rotates with the stirring shaft, that is, the first alloy ring is stationary, and the second alloy ring rotates with the stirring shaft, and the two alloy rings rotate relatively. In the process of relative rotation, a certain sealing pressure is maintained under the spring elastic force, and the sealing can still be maintained. Therefore, the two mechanical seals realize the radial and axial sealing between the stirring shaft and the stirring barrel and the stirring motor, and the sealing effect is very good.
[0013] 2、A second water storage cavity is arranged between the upper sealing cover and the lower sealing cover. The cooling water in the second water storage cavity has a certain pressure, which not only can cool the mechanical seal and the stirring shaft, prolong the service life of the mechanical seal, but also can further prevent the infiltration and leakage of the cement slurry, improve the sealing effect, protect the bearing and the stirring motor, and prolong the service life of the bearing and the motor, achieving two goals at once. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is a sectional view of the application;
[0015] Figure 2 is Figure 1 A local enlarged view in the direction of in the
[0016] In the figure: 1, stirring shaft; 2, upper sealing cover; 201, first water storage cavity, 202, first cooling water channel, 203, second cooling water channel, 204, water inlet, 205, water outlet, 206, second water storage cavity, 207, third water storage cavity; 3, joint; 4, lower sealing cover; 5, connecting flange; 6, shaft coupling; 7, motor; 8, mechanical seal, 801, rubber pad, 802, first alloy ring, 803, second alloy ring, 804, rubber ring, 805, retaining ring, 806, spring, 807, spring tray; 9, bearing; 10, bearing cover. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.
[0018] As Figure 1As shown, the sealing connection structure of the stirring shaft includes upper sealing cover 2, lower sealing cover 4, connecting flange 5, shaft coupling 6, mechanical seal 8. Among them, the motor 7 is arranged below the stirring barrel. The top of the upper sealing cover 2 is connected to the bottom of the stirring barrel by bolts, and the connecting surface of the upper sealing cover 2 and the stirring barrel is provided with a sealing gasket to prevent mud from leaking out of the assembly gap between the upper sealing cover 2 and the stirring barrel. The lower sealing cover 4 is connected to the upper sealing cover 2 by bolts, the middle of the connecting flange 5 is a cylindrical structure, and each end of the cylinder is provided with a flange. The top of the upper flange is connected to the bottom flange of the lower sealing cover 4 by bolts, and the lower flange is connected to the flange of the motor 7 by bolts. The shaft coupling 6 is located inside the cylinder of the connecting flange 5, the output shaft of the motor 7 is connected to the stirring shaft 1 through the shaft coupling 6, and the stirring shaft 1 extends into the stirring barrel to connect the stirring blades in sequence through the lower sealing cover 4 and the upper sealing cover 2. The stirring shaft 1 is rotatably connected to the lower sealing cover 4 through the bearing 9. The bearing cover 10 is connected to the lower sealing cover 4 by bolts, and the bearing cover 10 fixes the bearing 9 in the lower sealing cover 4. The lower end surface of the bearing is screwed to the circular nut on the stirring shaft, so that the stirring shaft is axially locked.
[0019] The stirring shaft 1 is connected to the upper sealing cover 2 and the lower sealing cover 4 by two mechanical seals 8 respectively. As shown, Figure 2 The mechanical seal 8 is composed of a static ring and a dynamic ring, and the stirring shaft 1 passes through the center of the static ring and the dynamic ring. The dynamic ring rotates with the stirring shaft 1. The static ring is stationary and does not rotate. The static ring includes a rubber pad 801 and a first alloy ring 802. The dynamic ring includes a second alloy ring 803, a rubber ring 804, a retaining ring 805, a spring 806, and a spring tray 807. The rubber pad 801 is embedded in the upper sealing cover 2 or the lower sealing cover 4, and the first alloy ring 802 is embedded in the rubber pad 801. The side vertical surface of the rubber pad 801 is sealed with the upper sealing cover 2.
[0020] The upper end surface of the second alloy ring 803 is in contact with the lower end surface of the first alloy ring 802, the second alloy ring 803 is embedded with the rubber ring 804, the rubber ring 804 is embedded in the retaining ring 805, the spring 806 is sleeved outside the retaining ring 805, one end of the spring 806 is connected to the spring tray 807, and the other end is connected to the lower end surface of the outer boss of the retaining ring 805. The spring tray 807 is arranged on the shaft seat end surface of the stirring shaft 1. The spring 806 is always in a compressed state, providing axial pressure for the retaining ring 805, the rubber ring 804 and the second alloy ring 803, so that the upper end surface of the second alloy ring 803 tightly contacts the lower end surface of the first alloy ring 802, forming a certain sealing pressure, and the abutting surface between the two alloy rings forms an end face seal. The rubber ring 804 is sleeved outside the stirring shaft 1, which realizes the axial sealing of the stirring shaft 1.
[0021] When the stirring barrel is working, the stirring shaft 1 rotates, the moving ring rotates with the stirring shaft 1, and the static ring is static. The second alloy ring 803 rotates, the first alloy ring 802 is static, the two alloy rings rotate relatively and always keep a certain sealing pressure under the action of the spring 806, and the sealing of the abutting surfaces can still be realized in the movement process. In summary, the mechanical seal 8 realizes three seals, the first seal is the seal of the side vertical surface between the rubber pad 801 and the upper sealing cover 2, the second seal is the seal between the abutting surfaces of the first alloy ring 802 and the second alloy ring 803, and the third seal is the axial seal between the rubber ring 804 and the stirring shaft 1.
[0022] The relative movement of the first alloy ring 802 and the second alloy ring 803 generates heat by friction. In order to reduce the temperature of the mechanical seal 8 and prolong the service life of the mechanical seal, the technical personnel sets a water cooling system on the upper sealing cover 2.
[0023] The water cooling system comprises a first water storage cavity 201, a first cooling water channel 202, a second cooling water channel 203, a water inlet 204, a water outlet 205, a second water storage cavity 206 and a third water storage cavity 207. The water inlet 204 is connected with cooling water, the cooling water enters the first cooling water channel 202 from the water inlet 204, then flows into the first water storage cavity 201, and then flows into the second water storage cavity 206. The water in the second water storage cavity 206 cools the two mechanical seals 8. The water in the second water storage cavity 206 flows into the third water storage cavity 207, the water in the third water storage cavity 207 flows into the second cooling water channel 203, and then flows out through the water outlet 205 to complete the cooling. The first water storage cavity 201 and the third water storage cavity 207 are both annular cavities, which are arranged around the rubber pad 801.
[0024] The stirring shaft 1 is provided with a shaft table, and the two mechanical seals 8 are installed on the two sides of the shaft table. The second water storage cavity 206 cools the two mechanical seals 8 on the two sides of the shaft table at the same time. Meanwhile, the circulating cooling water in the second water storage cavity 206 has a certain pressure, which further prevents the infiltration and leakage of the cement slurry.
[0025] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A slurry spraying apparatus with a stirring shaft sealing connection structure, characterized by, The utility model relates to a sealing device of agitator, including upper sealing cover (2), lower sealing cover (4), connecting flange (5), mechanical seal (8), the top of upper sealing cover (2) is connected on the stirring barrel through bolt, and the junction of upper sealing cover (2) with stirring barrel is equipped with sealing pad, lower sealing cover (4) is assembled on upper sealing cover (2), the bottom of connecting flange (5) is detachably connected in lower sealing cover (4) through bolt, the bottom of connecting flange (5) is detachably connected the flange of motor (7) through bolt, the output shaft of motor (7) is coaxial connection with stirring shaft (1) through shaft coupling (6), and stirring shaft (1) extends to the stirring barrel connection stirring blade after passing through lower sealing cover (4), upper sealing cover (2) in proper order, and stirring shaft (1) is rotatably connected lower sealing cover (4) through bearing (9), and mechanical seal (8) is set on stirring shaft (1), and stirring shaft (1) is sealedly connected with upper sealing cover (2) and lower sealing cover (4) through two mechanical seals (8) respectively.
2. The seal connection structure of the stirring shaft for the slurry spraying apparatus according to claim 1, wherein Cooling system is arranged in upper sealing cover (2), and cooling system carries out cooling to two mechanical seals (8) and stirring shaft (1).
3. The seal connection structure of the stirring shaft for the slurry spraying apparatus according to claim 2, wherein The cooling system comprises a first water storage cavity (201), a first cooling water channel (202), a second cooling water channel (203), a water inlet (204), a water outlet (205), a second water storage cavity (206) and a third water storage cavity (207). The water inlet (204) is connected to cooling water. One end of the first cooling water channel (202) is connected to the water inlet (204), and the other end is connected to the first water storage cavity (201). One end of the second cooling water channel (203) is connected to the water outlet (205), and the other end is connected to the third water storage cavity (207). The first water storage cavity (201) and the third water storage cavity (207) are both connected to the second water storage cavity (206). The water in the second water storage cavity (206) cools the mechanical seals (8) and the stirring shaft (1).
4. The seal connection structure of the stirring shaft for the slurry spraying apparatus according to claim 3, wherein The first water storage cavity (201) is an annular cavity. The upper sealing cover (2) is provided with a cylindrical cavity with an opening downward. The lower sealing cover (4) is sealingly connected to the upper sealing cover (2) by a sealing ring, so that the cylindrical cavity forms a closed second water storage cavity (206).
5. The seal connection structure of the stirring shaft for the slurry spraying apparatus according to claim 3, wherein The stirring shaft (1) is provided with a shaft platform. The shaft platform is located in the second water storage cavity (206). One mechanical seal (8) is arranged between the upper surface of the shaft platform and the upper sealing cover (2). Another mechanical seal (8) is arranged between the lower surface of the shaft platform and the lower sealing cover (4).
6. The seal connection structure of the stirring shaft for the slurry spraying apparatus according to claim 1, wherein The mechanical seal (8) is composed of a static ring and a dynamic ring, the stirring shaft (1) passes through the center of the static ring and the dynamic ring, the dynamic ring rotates with the stirring shaft (1), and the static ring does not rotate; the static ring comprises a rubber pad (801) and a first alloy ring (802), the dynamic ring comprises a second alloy ring (803), a rubber ring (804), a retaining ring (805), a spring (806) and a spring tray (807), the rubber pad (801) is embedded on the upper sealing cover (2) or the lower sealing cover (4), and the first alloy ring (802) is embedded on the rubber pad (801); the upper end surface of the second alloy ring (803) is in abutment with the lower end surface of the first alloy ring (802), the second alloy ring (803) is embedded and connected with the rubber ring (804), the rubber ring (804) is embedded in the retaining ring (805), the spring (806) is sleeved and connected outside the retaining ring (805), one end of the spring (806) is connected with the spring tray (807), the other end is connected with the lower end surface of the outer boss of the retaining ring (805), and the spring tray (807) is installed on the stirring shaft (1); the rubber ring (804) realizes the axial sealing of the stirring shaft (1), under the elastic force of the spring (806), the rubber pad (801) realizes the sealing of the upper sealing cover (2) or the lower sealing cover (4), and the first alloy ring (802) and the second alloy ring (803) still realize the sealing of the abutting end surfaces in the mutual rotation process.