Mechanical sealing device convenient to adjust

Abstract

The utility model relates to a mechanical sealing device convenient to adjust, which is applied to the field of mechanical sealing and comprises a pump casing, a rotating shaft movably penetrating through the pump casing and a steel ring movably sleeved on the outer surface of the rotating shaft, a plurality of mounting grooves are dug on the annular inner wall of the steel ring, and a retainer ring is arranged in an inner cavity of the steel ring. The front end and the rear end of the check ring are fixedly connected with a plurality of springs corresponding to the mounting grooves respectively, ejector rods are fixedly connected into the mounting grooves and movably penetrate through the two springs and the check ring in sequence, a carbon ring is inserted into the front end of the steel ring in a threaded mode, and a containing groove is formed in the rear end of the carbon ring. The end face of the carbon ring is always centered and attached to the end face of the shaft sleeve through adjustment, eccentric abrasion of the end face of the carbon ring is effectively avoided, even if the end face of the carbon ring is abraded after use, the position of the carbon ring can be finely adjusted to enable the carbon ring to recover to be tightly attached to the end face of the shaft sleeve, and therefore the sealing performance is effectively improved. And the wear can be compensated to a limit and the service life can be prolonged by axially adjusting the carbon ring.

Description

Technical Field

[0001] The utility model relates to a mechanical sealing device, in particular to a conveniently adjustable mechanical sealing device applied in the field of mechanical sealing. Background Art

[0002] In centrifugal pumps, centrifuges, reactors, compressors and other equipment, since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks outward through this gap. If the pressure inside the equipment is lower than the atmospheric pressure, air leaks into the equipment. Therefore, there must be a shaft seal device to prevent leakage. There are many types of shaft seals. Mechanical seals are widely used due to their good sealing performance, long service life, low power loss, and low wear of the shaft or sleeve surface.

[0003] The specification of Chinese patent publication number CN221145306U discloses a mechanical sealing device. The first limiting groove of the sealing housing of the utility model is located in the second limiting groove of the sealing ring, which prevents the sealing ring from rotating. It has a simple structure, is easy to disassemble and assemble, and is stable to use.

[0004] The existing carbon ring assembly includes a steel ring and a carbon ring. The steel ring is provided with an annular groove, and a spring is provided in the annular groove. The carbon ring is placed in the annular groove and connected to the spring, and is supported by the spring. When the carbon ring is squeezed, the spring at the bottom will retract in the direction of the force. The carbon ring is a consumable and will wear and become thinner like a brake pad after long-term use. The spring pushes the carbon ring for adaptive compensation.

[0005] However, the existing carbon ring assembly relies solely on the mechanical energy of spring deformation for support, and the spring has no axial positioning. During the support process, the spring is prone to deformation and deflection, which causes uneven wear on the end face of the carbon ring. The deformed and deflected spring is prone to breakage, which causes the connection between the carbon ring and the steel ring to break instantly, resulting in a gap between the carbon ring and the sleeve, and further leading to seal failure. Utility Model Content

[0006] In response to the above-mentioned existing technology, the technical problem to be solved by the present invention is that when the carbon ring is supported by a spring, the spring has no axial positioning and is prone to deformation and bending during the support process, thereby causing eccentric wear on the end face of the carbon ring. The deformed and deflected spring is prone to breakage, resulting in a gap between the carbon ring and the sleeve, which in turn causes sealing failure.

[0007] In order to solve the above problems, the utility model provides a mechanical sealing device that is easy to adjust, including a pump housing, a rotating shaft that movably passes through the pump housing, and a steel ring that movably sleeves on the outer surface of the rotating shaft. A plurality of mounting grooves are bored on the annular inner wall of the steel ring, and a retaining ring is provided in the inner cavity of the steel ring. A plurality of springs corresponding to the plurality of mounting grooves are fixedly connected at the front and rear ends of the retaining ring. A push rod is fixedly connected in the mounting groove, and the push rod movably passes through the two springs and the retaining ring in turn. A carbon ring is threadedly inserted at the front end of the steel ring, and a receiving groove is bored at the rear end of the carbon ring. The front end of the push rod movably passes through the receiving groove, and the carbon ring is inserted at the rear end of the carbon ring. A sealing ring is provided between the ring and the steel ring, and anti-rotation bolts are threaded through the left and right ends of the steel ring, and the corresponding ends of the two anti-rotation bolts are in conflict with the carbon ring. A shaft sleeve is inserted at the front end of the carbon ring, and the shaft sleeve fixing sleeve is arranged on the outer surface of the rotating shaft. The outer surface fixing sleeve of the shaft sleeve is provided with a plurality of first convex pieces, and the outer surface sleeve of the shaft sleeve is provided with two symmetrically distributed protective sleeves, and the protective sleeve includes a flange plate attached to the pump casing, the front end of the flange plate is fixedly connected to a positioning ring, the inner wall of the positioning ring is slidably connected to a moving ring, the front end of the moving ring is fixedly connected to a shell sleeve, and the inner wall of the shell sleeve is fixedly connected to a plurality of second convex pieces.

[0008] In the above-mentioned mechanical sealing device which is easy to adjust, the carbon ring is screwed into the steel ring by threading and then radially locking the carbon ring by means of a stop bolt, so as to facilitate precise adjustment of the axial position. The push rod and the retaining ring can axially position the spring, effectively preventing the spring from bending and deforming during support, and provide positioning support and elastic compensation for the carbon ring. Through adjustment, the end face of the carbon ring is always aligned with the end face of the sleeve, effectively preventing eccentric wear of the end face of the carbon ring. Even if the end face of the carbon ring is worn after use, the position of the carbon ring can be fine-tuned to restore its close fit with the end face of the sleeve, thereby effectively improving the sealing performance. The carbon ring can then be compensated for wear to a limited extent and its use can be extended by axially adjusting the carbon ring.

[0009] As a further improvement of the present application, the steel ring and the flange plate are connected to the pump casing by mounting bolts, the two shells are fitted together, and the two shells are fixedly connected by mounting bolts, and the inner ring surfaces of the steel ring and the carbon ring are fitted with the rotating shaft.

[0010] As a further improvement of the present application, a plurality of first protrusions and a plurality of second protrusions are staggered and distributed with a gap between the outer annular surface of the first protrusion and the shell sleeve, and a gap between the second protrusion and the outer surface of the shaft sleeve.

[0011] As a further improvement of the present application, the longitudinal cross-sections of the shell and the second protrusion are both semicircular, and the front end of the shell fits against the rotating shaft.

[0012] As another improvement of the present application, the spring at the rear end is located in the mounting groove and is fixedly connected to the inner wall of the mounting groove. The front end of the spring at the front end fits with the rear end of the carbon ring, and the outer ring surface of the retaining ring fits with the inner wall of the steel ring.

[0013] As another improvement of the present application, a temperature sensor is fixedly embedded in the inner cavity of the steel ring, the temperature sensor is located on the rear side of the carbon ring, and the temperature sensor is connected to the external controller signal.

[0014] To sum up, in actual application, after connecting the steel ring to the pump casing, the carbon ring is screwed into the steel ring so that the rear end of the carbon ring contacts the spring in the front. As the multiple springs are compressed toward the pump casing, the anti-rotation bolt is screwed in so that the anti-rotation bolt conflicts with the carbon ring, thereby positioning the carbon ring. After installing the shaft sleeve and protective sleeve, the end face of the carbon ring is adjusted to always fit in the center of the end face of the shaft sleeve, effectively avoiding eccentric wear of the end face of the carbon ring. The shaft sleeve rotates with the rotation of the shaft and is always in contact with the end of the carbon ring. Even if the end face of the carbon ring is worn after use, the position of the carbon ring can be fine-tuned to restore its close fit with the end face of the shaft sleeve, thereby effectively improving the sealing performance. The carbon ring can be compensated for wear to a limited extent and its service life can be extended by axial adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present application;

[0016] Figure 2 This is a structural cross-sectional view of the first embodiment of the present application;

[0017] Figure 3 This is a schematic diagram of the carbocyclic structure of the first embodiment of the present application;

[0018] Figure 4 This is a schematic diagram of the steel ring structure of the first embodiment of the present application;

[0019] Figure 5 This is a schematic diagram of the retaining ring structure of the first embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the first protrusion structure of the first embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the protective shell structure of the first embodiment of this application;

[0022] Figure 8 This is a structural cross-sectional view of the second embodiment of the present application.

[0023] Description of the numbers in the figure:

[0024] 1 steel ring, 2 mounting groove, 3 retaining ring, 4 spring, 5 push rod, 6 temperature sensor, 7 carbon ring, 8 sealing ring, 9 anti-rotation bolt, 10 shaft sleeve, 11 first protrusion, 12 protective sleeve, 121 flange plate, 122 positioning ring, 123 dynamic ring, 124 shell, 125 second protrusion. DETAILED DESCRIPTION

[0025] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0026] The first implementation method:

[0027] Figure 1-Figure 5 FIG. 1 shows a mechanical seal device that is easy to adjust, comprising a pump housing, a rotating shaft that movably passes through the pump housing, and a steel ring 1 that movably sleeves on the outer surface of the rotating shaft. In the figure, A is the pump housing, B is the rotating shaft, the steel ring 1 and the flange plate 121 are connected to the pump housing by mounting bolts, and the inner ring surfaces of the steel ring 1 and the carbon ring 7 are in contact with the rotating shaft. A plurality of mounting grooves 2 are cut on the annular inner wall of the steel ring 1, and a retaining ring 3 is provided in the inner cavity of the steel ring 1. A plurality of springs 4 corresponding to the plurality of mounting grooves 2 are fixedly connected to the front and rear ends of the retaining ring 3. A push rod 5 is fixedly connected in the mounting groove 2, and the push rod 5 movably passes through the two springs 4 in sequence. And the retaining ring 3, the spring 4 at the rear end is located in the mounting groove 2 and is fixedly connected to the inner wall of the mounting groove 2. The front end of the spring 4 at the front end fits with the rear end of the carbon ring 7, and the outer ring surface of the retaining ring 3 fits with the inner wall of the steel ring 1. The rear end of the carbon ring 7 contacts the front spring 4. As the carbon ring 7 moves axially, multiple springs 4 are compressed toward the pump casing. The multiple springs 4 in the front can push the carbon ring 7 to axially compress the sleeve 10. The spring 4 at the rear can buffer vibration and effectively prevent overload. The retaining ring 3 can transmit elastic force and keep the push rod 5 centered, and the push rod 5 guides the moving path of the carbon ring 7 to prevent rotational deviation.

[0028] Figure 2-Figure 4 It is shown that: a carbon ring 7 is threadedly inserted into the front end of the steel ring 1, and a receiving groove is bored at the rear end of the carbon ring 7. The front end of the push rod 5 is movable and penetrates into the receiving groove. A sealing ring 8 is provided between the carbon ring 7 and the steel ring 1. The sealing ring 8 can effectively improve the sealing between the steel ring 1 and the rotating shaft. Stop bolts 9 are threadedly penetrated at both ends of the steel ring 1. The corresponding ends of the two stop bolts 9 are in conflict with the carbon ring 7. The position of the carbon ring 7 is adjusted axially through the threaded connection, and the carbon ring 7 is positioned by the stop bolts 9. Even if the spring 4 fails, the thread can still maintain the position of the carbon ring 7, and the stop bolts 9 limit and fix the carbon ring 7. Through the precise positioning of the thread and the flexible compensation of the spring 4, the problems of rough adjustment and uncontrolled eccentric wear between the traditional carbon ring 7 and the spring 4 are effectively solved.

[0029] Figure 2 、 Figure 6 and Figure 7It is shown that: a shaft sleeve 10 is inserted into the front end of the carbon ring 7, and the shaft sleeve 10 rotates with the shaft to transmit torque. The shaft sleeve 10 is fixedly sleeved on the outer surface of the shaft, and a plurality of first protrusions 11 are fixedly sleeved on the outer surface of the shaft. The first protrusion 11 is a radial protrusion fixed on the shaft sleeve 10 and rotates with the rotation of the shaft sleeve 10. A gap is left between the second protrusion 125 and the outer surface of the shaft sleeve 10, and two symmetrically distributed protective sleeves 12 are sleeved on the outer surface of the shaft sleeve 10. The protective sleeve 12 includes a flange plate 121 attached to the pump casing, and a positioning ring 122 is fixedly connected to the front end of the flange plate 121. The inner wall of the positioning ring 122 is slidably connected to a dynamic ring 123, and the dynamic ring 123 can slide axially on the positioning ring 122 , it is convenient to adjust the length of the protective sleeve 12 according to the position of the shaft sleeve 10, the front end of the dynamic ring 123 is fixedly connected with the shell sleeve 124, the two shell sleeves 124 fit together, and the two shell sleeves 124 are fixedly connected by installing bolts, and the inner wall of the shell sleeve 124 is fixedly connected with multiple second protrusions 125, multiple first protrusions 11 and multiple second protrusions 125 are staggered with each other, and a gap is left between the outer ring surface of the first protrusion 11 and the shell sleeve 124. The longitudinal sections of the shell sleeve 124 and the second protrusion 125 are both semicircular, and the front end of the shell sleeve 124 fits with the rotating shaft, and the first protrusion 11 and the second protrusion 125 are staggered, thereby forming a multi-stage tortuous leakage channel, which effectively increases the airflow resistance and effectively reduces the leakage rate.

[0030] After the steel ring 1 is connected to the pump housing, the carbon ring 7 is screwed into the steel ring 1 so that the rear end of the carbon ring 7 contacts the spring 4 in the front. As the carbon ring 7 moves axially, the multiple springs 4 are compressed toward the pump housing. The multiple springs 4 in the front can push the carbon ring 7 to axially press the sleeve 10, and the spring 4 in the rear can buffer vibration and effectively prevent overload. Then, the anti-rotation bolt 9 is screwed in so that the anti-rotation bolt 9 conflicts with the carbon ring 7, thereby positioning the carbon ring 7. After the sleeve 10 and the protective sleeve 12 are installed, the end face of the carbon ring 7 is adjusted so that it is always aligned with the end face of the sleeve 10, effectively avoiding eccentric wear of the end face of the carbon ring 7. The sleeve 10 rotates with the rotation of the rotating shaft and is always in contact with the end face of the carbon ring 7. Even if the end face of the carbon ring 7 is worn after use, the position of the carbon ring 7 can be fine-tuned to restore it to a close fit with the end face of the sleeve 10, thereby effectively improving the sealing performance. Furthermore, the carbon ring 7 can be compensated for wear to a limited extent and its service life can be extended by axially adjusting the carbon ring 7.

[0031] Second implementation method:

[0032] This embodiment is based on the first embodiment, and a temperature sensor 6 is added. The rest of the parts remain the same as the first embodiment.

[0033] Figure 8It is shown that a temperature sensor 6 is fixedly embedded in the inner cavity of the steel ring 1. Those skilled in the art can select a suitable model of temperature sensor 6 according to actual needs, such as WZP-231. The temperature sensor 6 is located on the rear side of the carbon ring 7, and the temperature sensor 6 is connected to the external controller signal.

[0034] When the new carbon ring 7 is running in, its temperature rises steadily and slowly with the length of use. At this time, the carbon ring 7 wears evenly. When the carbon ring 7 is excessively worn or damaged, its temperature changes are also different from usual. At this time, the temperature change of the carbon ring 7 can be monitored in real time by the temperature sensor 6 to determine whether the carbon ring 7 is damaged, so that the carbon ring 7 can be replaced in time.

[0035] This implementation is optional and not necessary. In specific implementation, it can be implemented according to the first or second implementation according to actual needs.

[0036] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A mechanical sealing device that is easily adjustable, comprising a pump housing, a rotating shaft that movably passes through the pump housing, and a steel ring (1) that movably sleeves on the outer surface of the rotating shaft, characterized in that: A plurality of mounting grooves (2) are bored on the annular inner wall of the steel ring (1), a retaining ring (3) is provided in the inner cavity of the steel ring (1), a plurality of springs (4) corresponding to the plurality of mounting grooves (2) are fixedly connected to the front and rear ends of the retaining ring (3), a push rod (5) is fixedly connected in the mounting groove (2), the push rod (5) moves through the two springs (4) and the retaining ring (3) in sequence, a carbon ring (7) is threadedly inserted at the front end of the steel ring (1), a receiving groove is bored at the rear end of the carbon ring (7), the front end of the push rod (5) moves through the receiving groove, a sealing ring (8) is provided between the carbon ring (7) and the steel ring (1), a stop bolt (9) is threadedly penetrated at the left and right ends of the steel ring (1), and the corresponding ends of the two stop bolts (9) are in conflict with the carbon ring (7); A shaft sleeve (10) is inserted into the front end of the carbon ring (7), and the shaft sleeve (10) is fixedly sleeved on the outer surface of the rotating shaft. The outer surface of the shaft sleeve (10) is fixedly sleeved with a plurality of first protrusions (11), and the outer surface of the shaft sleeve (10) is sleeved with two symmetrically distributed protective sleeves (12), and the protective sleeve (12) includes a flange plate (121) attached to the pump casing, and the front end of the flange plate (121) is fixedly connected to a positioning ring (122), and the inner wall of the positioning ring (122) is slidably connected to a dynamic ring (123), and the front end of the dynamic ring (123) is fixedly connected to a shell sleeve (124), and the inner wall of the shell sleeve (124) is fixedly connected to a plurality of second protrusions (125).

2. The easily adjustable mechanical sealing device according to claim 1, characterized in that: The steel ring (1) and the flange plate (121) are both connected to the pump casing via mounting bolts, the two casings (124) are fitted together, and the two casings (124) are fixedly connected via mounting bolts, and the inner ring surfaces of the steel ring (1) and the carbon ring (7) are both fitted to the rotating shaft.

3. The easily adjustable mechanical sealing device according to claim 1, characterized in that: The plurality of first protrusions (11) and the plurality of second protrusions (125) are staggered and distributed with each other, a gap is left between the outer annular surface of the first protrusion (11) and the shell (124), and a gap is left between the second protrusion (125) and the outer surface of the shaft sleeve (10).

4. The easily adjustable mechanical sealing device according to claim 3, characterized in that: The longitudinal sections of the shell (124) and the second protruding piece (125) are both semicircular, and the front end of the shell (124) fits the rotating shaft.

5. The easily adjustable mechanical sealing device according to claim 1, characterized in that: The spring (4) at the rear end is located in the mounting groove (2) and is fixedly connected to the inner wall of the mounting groove (2). The front end of the spring (4) at the front end fits with the rear end of the carbon ring (7), and the outer ring surface of the retaining ring (3) fits with the inner wall of the steel ring (1).

6. The easily adjustable mechanical sealing device according to claim 1, characterized in that: A temperature sensor (6) is fixedly embedded in the inner cavity of the steel ring (1), the temperature sensor (6) is located on the rear side of the carbon ring (7), and the temperature sensor (6) is connected to an external controller signal.

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