Mechanical sealing structure for permanent magnet motor pump

Abstract

The mechanical sealing structure for the permanent magnet motor pump comprises an output shaft, a shell cover and a motor shell, a cylindrical protrusion is arranged at the circle center of the shell cover, a sealing groove is formed in the cylindrical protrusion of the shell cover, a sealing assembly is installed in the sealing groove, the upper end face of the shell cover is fixedly connected with an annular installation base, and the annular installation base is fixedly connected with the motor shell. The inner wall of the mounting base is tightly attached to the outer wall of the motor shell, and the output shaft is located in the motor shell and penetrates through the sealing assembly. A plurality of prismatic convex blocks with rectangular cross sections are fixedly mounted outside the motor shell, a plurality of prismatic mounting grooves with rectangular cross sections are formed in the inner wall of the mounting seat, and the convex blocks are matched with the mounting grooves. Compared with the prior art, the sealing device has the beneficial effects that the inner sealing ring and the outer sealing ring which are larger than the inner clamping groove and the outer clamping groove in normal size are designed, so that the abrasion of the inner sealing ring and the outer sealing ring can be reduced while the sealing performance is ensured; through the installation base, the protruding block on the motor shell and the limiting block, sealing installation of the motor shell is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal structure for a permanent magnet motor pump. Background Art

[0002] A permanent magnet motor is an electric motor that uses permanent magnets as the main source of magnetic field. The interior of a permanent magnet motor is mainly composed of stators, rotors, end covers and other components. The stator structure is usually similar to that of an induction motor, using a laminated structure to reduce iron losses; the rotor can be solid or laminated, with permanent magnet material mounted on it. The armature winding can be in different forms such as concentrated full-pitch windings or distributed short-pitch windings. During operation, the rotating multi-polarized permanent magnet rotor forms a time-varying magnetic flux in the air gap, which generates an AC voltage on the stator winding terminals, thereby realizing the function of converting electrical energy into mechanical energy.

[0003] Permanent magnet motor pumps use permanent magnetic materials to generate magnetic fields, without the need for external current to excite the magnetic field, thereby simplifying the motor structure and improving efficiency. When the motor drives the pump shaft to rotate, the impeller on the pump shaft also rotates, sucking the liquid from the inlet and pushing it to the outlet through the rotation of the impeller. This design not only reduces energy consumption, but also improves overall operating efficiency. Compared with traditional electric excitation pumps, permanent magnet motor pumps have the advantages of simple structure and high efficiency and energy saving. Traditional electric excitation pumps require current to excite the magnetic field, while permanent magnet motor pumps do not require this process, so their energy consumption is lower.

[0004] In the hydraulic system, the motor pump is an important device for providing oil source. The connection between the motor shaft and the pump body needs to be effectively sealed to prevent liquid or gas from invading and causing the motor shaft to rust or be damaged. In the prior art, the commonly used rubber sealing ring has the problem of large wear and tear and needs to be replaced frequently, which affects the work efficiency. At the same time, the motor housing itself is not sealed, which may lead to insufficient sealing. Utility Model Content

[0005] The utility model aims to provide a mechanical seal structure for a permanent magnet motor pump, so as to solve the problems of large wear of the rubber ring and lack of sealing of the motor housing proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a mechanical seal structure for a permanent magnet motor pump, comprising an output shaft, a shell cover, and a motor shell, wherein a cylindrical protrusion is provided at the center of the shell cover, a sealing groove is provided at the cylindrical protrusion of the shell cover, a sealing assembly is installed inside the sealing groove, an annular mounting seat is fixedly connected to the upper end surface of the shell cover, the inner wall of the mounting seat is in close contact with the outer wall of the motor shell, the output shaft is located inside the motor shell, and passes through the sealing assembly;

[0007] A plurality of prismatic protrusions with rectangular cross-sections are fixedly installed on the outside of the motor housing, and a plurality of prismatic mounting grooves with rectangular cross-sections are opened on the inner wall of the mounting seat. The protrusions and the mounting grooves cooperate with each other, and a plurality of limit blocks are fixedly installed above the protrusions on the outside of the motor housing, and the bottom ends of the limit blocks are tightly attached to the upper end surface of the mounting seat.

[0008] Preferably, the sealing assembly includes two fixing rings, an outer sealing ring, and an inner sealing ring. The cross-section of the fixing ring is a double T-shape. The fixing rings are each provided with an inner groove and an outer groove. The two fixing rings are symmetrically installed. The circular bottom surface of the lower fixing ring is in close contact with the inner wall below the sealing groove. The annular surface of the lower fixing ring is in close contact with the upper fixing ring. Inner sealing rings are embedded in the two inner grooves, and outer sealing rings are embedded in the two outer grooves.

[0009] Preferably, the shell cover is provided with a plurality of threaded holes outside the mounting seat.

[0010] Preferably, the mounting seat is divided into two layers, the inner layer of the mounting seat cooperates with the protruding block, the inner layer of the mounting seat is made of rubber material, and the normal size of the mounting groove is smaller than the size of the protruding block.

[0011] Preferably, the inner sealing ring and the outer sealing ring are made of rubber material, and the normal sizes of the inner sealing ring and the outer sealing ring are larger than the sizes of the two inner card slots and the outer card slots.

[0012] Preferably, the fixing ring is made of highly magnetic material.

[0013] Compared with the prior art, the beneficial effects of the utility model are: 1. The utility model designs an inner sealing ring and an outer sealing ring whose normal size is larger than the size of the two inner card slots and the outer card slot, and a fixing ring with a highly magnetic material and a special structure, so that the two fixing rings can press the inner sealing ring and the outer sealing ring tightly after installation. Since the scheme does not completely achieve the sealing effect directly by the inner and outer sealing rings and is divided into two sealing rings to reduce the wear surface of the inner and outer sealing rings, it can reduce the wear of the inner and outer sealing rings while ensuring the sealing performance, and after the sealing ring is partially worn, the sealing effect can still be achieved because the size of the sealing ring is larger than the groove where it is located and it is squeezed, thereby extending the service life of the sealing ring.

[0014] 2. The utility model designs a mounting seat with an inner and outer layer structure, a protruding block and a limiting block on the motor casing. Since the normal size of the mounting groove of the mounting seat is smaller than the protruding block, the inner layer of the mounting seat can be squeezed after the mounting seat and the motor casing are installed so as to fit tightly with the motor casing. During operation, the mounting seat is squeezed by the limiting block to ensure that it will not shift. This solution realizes the sealed installation of the motor casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the external structure of the utility model.

[0016] Figure 2 This is a schematic diagram of the installation structure of the utility model.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0018] Figure 4 This is a schematic diagram of the sealing component structure of the utility model.

[0019] In the figure: 1. output shaft; 2. mounting seat; 21. mounting groove; 3. motor housing; 31. protrusion; 32. limit block; 4. housing cover; 41. threaded hole; 42. sealing groove; 5. sealing assembly; 51. fixing ring; 511. inner groove; 512. outer groove; 52. inner sealing ring; 53. outer sealing ring. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 2 and Figure 3 The utility model provides a technical solution: a mechanical seal structure for a permanent magnet motor pump, comprising an output shaft 1, a shell cover 4, and a motor shell 3. The shell cover 4 has a cylindrical protrusion at the center of the circle, and a sealing groove 42 is opened at the cylindrical protrusion of the shell cover 4. A sealing component 5 is installed inside the sealing groove 42. An annular mounting seat 2 is fixedly connected to the upper end surface of the shell cover 4. The inner wall of the mounting seat 2 is tightly attached to the outer wall of the motor shell 3. The output shaft 1 is located inside the motor shell 3 and passes through the sealing component 5.

[0022] Several rectangular prism-shaped protrusions 31 are fixedly installed on the outside of the motor housing 3, and several rectangular prism-shaped installation grooves 21 are opened on the inner wall of the mounting seat 2. The protrusions 31 and the installation grooves 21 cooperate with each other to realize the installation of the motor housing and the mounting seat. Several limit blocks 32 are also fixedly installed on the outside of the motor housing 3 above the protrusions 31. The bottom end of the limit block 32 is close to the upper end surface of the mounting seat 2 to prevent the motor housing 4 from being separated from the mounting seat 2 during operation;

[0023] The shell cover 4 is provided with a plurality of threaded holes 41 on the outside of the mounting seat 2, so as to facilitate the motor structure to be mounted on the working equipment without affecting the sealing of the motor;

[0024] The mounting base 2 is divided into two layers. The inner layer of the mounting base 2 cooperates with the raised block 31. The inner layer of the mounting base 2 is made of rubber. The normal size of the mounting groove 21 is smaller than the size of the raised block 31, which can squeeze the inner layer of the mounting base 2 after the motor housing 4 is installed to ensure sealing.

[0025] See also Figure 4 The sealing assembly 5 includes two fixing rings 51, an outer sealing ring 53, and an inner sealing ring 52. The fixing ring 51 has a double T-shaped cross section. The fixing rings 51 are provided with an inner groove 511 and an outer groove 512. The two fixing rings 51 are symmetrically installed. The circular bottom surface of the lower fixing ring 51 is in close contact with the inner wall below the sealing groove 42. The annular surface of the lower fixing ring 51 is in close contact with the upper fixing ring 51. The inner sealing rings 52 are embedded in the two inner grooves 511, and the outer sealing rings 53 are embedded in the two outer grooves 512. The two sealing rings reduce the wear contact surface between the inner sealing ring 52 and the outer sealing ring 53, thereby reducing wear.

[0026] The inner sealing ring 52 and the outer sealing ring 53 are made of rubber. The normal size of the inner sealing ring 52 and the outer sealing ring 53 is larger than the size of the two inner grooves 511 and the outer grooves 512, so that the inner sealing ring 52 and the outer sealing ring 53 are squeezed after installation to ensure the sealing of the output shaft;

[0027] The fixing ring 51 is made of a highly magnetic material and can maintain magnetic force to clamp the two fixing rings 51 , thereby ensuring that the inner sealing ring 52 and the outer sealing ring 53 are squeezed in multiple directions to ensure sealing.

[0028] Working principle:

[0029] The mechanical seal structure for the permanent magnet motor pump of the utility model mainly realizes the sealing effect through the coordinated work of the following parts:

[0030] 1. Matching of the shell cover and the motor shell: A sealing groove 42 is provided at the cylindrical protrusion of the shell cover 4 for installing the sealing assembly 5. The upper end surface of the shell cover 4 is fixedly connected with an annular mounting seat 2, whose inner wall is in close contact with the outer wall of the motor shell 3, ensuring the initial sealing between the motor shell and the shell cover;

[0031] 2. The matching of the protrusion and the mounting groove: The prismatic protrusion 31 on the outside of the motor housing 3 matches the prismatic mounting groove 21 on the inner wall of the mounting seat 2. This structural design enables the motor housing to be stably mounted in the mounting seat and provides a certain sealing effect;

[0032] 3. Function of the stopper: The stopper 32 outside the motor housing 3 is in close contact with the upper end surface of the mounting seat 2 to prevent the motor housing from being separated from the mounting seat during operation, thereby maintaining the integrity of the sealing structure;

[0033] 4. Design of the sealing assembly: The sealing assembly 5 is composed of two fixing rings 51, an outer sealing ring 53 and an inner sealing ring 52. The double T-shaped cross-section design of the fixing ring 51 and the structure of the inner groove 511 and the outer groove 512 enable the inner sealing ring 52 and the outer sealing ring 53 to be firmly embedded and installed. The rubber material of the inner sealing ring 52 and the outer sealing ring 53 and their design that is larger than the size of the groove ensure that they can be squeezed after installation, thereby achieving effective sealing of the output shaft 1. At the same time, the two sealing rings reduce the wear surface of the inner sealing ring 52 and the outer sealing ring 53, so that the wear of the inner and outer sealing rings can be reduced while ensuring the sealing performance, thereby extending the service life of the sealing rings;

[0034] 5. Magnetic material of the fixing ring: The fixing ring 51 is made of a highly magnetic material, which can maintain magnetic force to achieve the clamping of the two fixing rings. This not only ensures that the inner sealing ring 52 and the outer sealing ring 53 are squeezed in multiple directions, but also ensures that they can still be squeezed to ensure the sealing effect after partial wear of the inner sealing ring 52 and the outer sealing ring 53, thereby achieving durability and reliability of the seal.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal structure for a permanent magnet motor pump, comprising an output shaft (1), a housing cover (4), and a motor housing (3), characterized in that: The shell cover (4) has a cylindrical protrusion at the center of the circle, and a sealing groove (42) is opened at the cylindrical protrusion of the shell cover (4). A sealing assembly (5) is installed inside the sealing groove (42). The upper end surface of the shell cover (4) is fixedly connected to an annular mounting seat (2), and the inner wall of the mounting seat (2) is tightly attached to the outer wall of the motor shell (3). The output shaft (1) is located inside the motor shell (3) and passes through the sealing assembly (5); The motor housing (3) is externally fixedly provided with a plurality of prismatic protrusions (31) with rectangular cross sections, and the inner wall of the mounting seat (2) is provided with a plurality of prismatic mounting grooves (21) with rectangular cross sections. The protrusions (31) and the mounting grooves (21) cooperate with each other. The motor housing (3) is externally fixedly provided with a plurality of limit blocks (32) above the protrusions (31), and the bottom ends of the limit blocks (32) are closely attached to the upper end surface of the mounting seat (2).

2. A mechanical seal structure for a permanent magnet motor pump according to claim 1, characterized in that: The sealing assembly (5) comprises two fixing rings (51), an outer sealing ring (53), and an inner sealing ring (52). The fixing ring (51) has a double T-shaped cross section. The fixing ring (51) is provided with an inner groove (511) and an outer groove (512). The two fixing rings (51) are symmetrically mounted. The circular bottom surface of the lower fixing ring (51) is in close contact with the lower inner wall of the sealing groove (42). The annular surface of the lower fixing ring (51) is in close contact with the upper fixing ring (51). The inner sealing rings (52) are embedded in the two inner grooves (511), and the outer sealing rings (53) are embedded in the two outer grooves (512).

3. The mechanical seal structure for a permanent magnet motor pump according to claim 1, characterized in that: The shell cover (4) is provided with a plurality of threaded holes (41) on the outside of the mounting seat (2).

4. The mechanical seal structure for a permanent magnet motor pump according to claim 1, characterized in that: The mounting seat (2) is divided into two layers, the inner layer of the mounting seat (2) cooperates with the protruding block (31), the inner layer of the mounting seat (2) is made of rubber material, and the normal size of the mounting groove (21) is smaller than the size of the protruding block (31).

5. The mechanical seal structure for a permanent magnet motor pump according to claim 2, characterized in that: The inner sealing ring (52) and the outer sealing ring (53) are made of rubber material, and the normal sizes of the inner sealing ring (52) and the outer sealing ring (53) are larger than the sizes of the two inner card slots (511) and the outer card slots (512).

6. The mechanical seal structure for a permanent magnet motor pump according to claim 2, characterized in that: The fixing ring (51) is made of a highly magnetic material.

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