Container type mechanical seal for double suction pump

Abstract

The utility model discloses a packaging type mechanical seal for a double suction pump, which relates to the technical field of double suction pumps, and comprises a pump shaft, a mechanical seal shaft sleeve is inserted outside the pump shaft in a penetrating manner, and an auxiliary mechanism is arranged on the outer ring surface of the mechanical seal shaft sleeve, in the packaging type mechanical seal, one side of an inserting rod is fixedly connected with a limiting ring, and the inner ring surface of the limiting ring is fixedly connected with a connecting piece; the limiting ring and the inserting rod can assist in connection of the connecting piece and the mechanical seal gland, under assistance of the spring, the attaching effect of the connecting piece, the mechanical seal shaft sleeve and the mechanical seal moving ring assembly can be guaranteed, then the overall assembling precision of the mechanical seal is improved, the limiting ring and the auxiliary ring can shield and protect one side of the mechanical seal gland, and the assembled mechanical seal becomes a whole. Independent pressure-resistant water leakage tests can be carried out, water leakage of the whole pump pressure test mechanical seal is avoided, connection between the positioning piece and the driving ring can be achieved through the fastening screws, the overall stability of the mechanical seal is improved, and therefore connection between the mechanical seal and a pump shaft is facilitated, and disassembly and replacement of the mechanical seal are also facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of double-suction pumps, in particular to a container-type mechanical seal for a double-suction pump. Background Art

[0002] During the operation of a double-suction pump, there is a pressure difference between the fluid inside the pump and the atmospheric pressure outside the pump. The fluid leaks outward along the gap between the shaft and the casing. For this reason, a sealing device is required, which is called a shaft seal. Common types of shaft seals include: packing seals, mechanical seals, etc.

[0003] For example, Chinese patent CN208252415U discloses a simulated cartridge mechanical seal for a new type of split-center double-suction pump, which includes a sleeve body of a bulk single-end mechanical seal sleeve, the sleeve body is sleeved on the outside of the shaft sleeve, and an outwardly protruding limit ring is provided on the outer surface of one end of the shaft sleeve. One end of the base portion of the sleeve body is located on the side of the shaft sleeve with the limit ring, and the other end of the sleeve body is connected to the front end face of the stationary ring. The stationary ring is installed between the mechanical seal cover and the shaft sleeve, the mechanical seal cover is sleeved in the middle of the shaft sleeve, and the other end of the shaft sleeve is sleeved with a transmission ring.

[0004] In the above patent, although the problem of manual adjustment of compression volume and high probability of damage is solved by the shaft sleeve and mechanical seal cover, it is still a bulk mechanical seal in nature. When multiple components are installed, the assembly accuracy of each component cannot be guaranteed, and the installed mechanical seal cannot be subjected to a separate pressure and water leakage test. Utility Model Content

[0005] The purpose of the utility model is to solve the problems in the prior art that the mechanical seal is essentially still a bulk type, the assembly accuracy of each component cannot be guaranteed when multiple components are installed, and the installed mechanical seal cannot be subjected to a separate pressure and water leakage test, and a container-type mechanical seal for a double-suction pump is proposed.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a container-type mechanical seal for a double-suction pump, comprising a pump shaft, a mechanical seal sleeve being inserted through the outside of the pump shaft, an auxiliary mechanism being provided on the outer ring surface of the mechanical seal sleeve, the auxiliary mechanism comprising a mechanical seal dynamic ring assembly, a mechanical seal static ring assembly and a limit ring, one side of the mechanical seal dynamic ring assembly is fixedly connected to the mechanical seal static ring assembly, one side of the mechanical seal static ring assembly is overlapped with an mechanical seal pressure cover, one side of the mechanical seal dynamic ring assembly is plugged with a connecting piece, a concave groove is provided on the outer ring surface of the connecting piece, a spring is installed in the concave groove, the outer ring surface of the connecting piece is connected to the limit ring by a thread, a plug-in rod is inserted through the inside of the limit ring, and one end of the plug-in rod is plugged into the mechanical seal pressure cover.

[0007] Preferably, the outer ring surface of the mechanical seal sleeve is overlapped with an auxiliary ring, the outer ring surface of the auxiliary ring is fixedly connected to the connecting piece, an O-ring 1 is embedded in the inner wall of the mechanical seal sleeve, and the pump shaft is inserted through the inside of the O-ring 1.

[0008] Preferably, an O-ring 2 is embedded on one side of the mechanical seal cover, and a guide hole is provided on one side of the O-ring 2.

[0009] Preferably, a driving ring is sleeved on the outer ring surface of the mechanical seal sleeve, and positioning holes are provided on one side of the driving ring and the mechanical seal sleeve.

[0010] Preferably, a positioning piece is engaged with one side of the driving ring, the inner ring surface of the positioning piece is engaged with the machine seal cover, and one side of the positioning piece is overlapped with the machine seal cover.

[0011] Preferably, the positioning pieces are semi-ring structures, and the two positioning pieces are engaged with each other.

[0012] Preferably, the positioning piece is connected to a fastening screw via a thread, and the end of the fastening screw passes through the side wall of the driving ring.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] 1. In the present invention, one side of the plug-in rod is fixedly connected to the limit ring, and the inner ring surface of the limit ring is fixedly connected to the connecting piece. The limit ring and the plug-in rod can assist the connection between the connecting piece and the machine seal cover. With the assistance of the spring, the fitting effect of the connecting piece, the machine seal sleeve and the machine seal dynamic ring assembly can be guaranteed, thereby improving the overall assembly accuracy of the machine seal. The limit ring and the auxiliary ring can shield and protect one side of the machine seal cover. The assembled machine seal becomes a whole, and a separate pressure leakage test can be carried out to avoid water leakage of the whole pump pressure test machine seal.

[0015] 2. In the present invention, one side of the drive ring overlaps with the machine seal cover, the drive ring is sleeved on the outside of the machine seal shaft sleeve, the positioning piece and the drive ring are snap-connected, and the drive ring can be used to limit the installation position of the machine seal cover on the outer ring surface of the machine seal shaft sleeve. The connection between the positioning piece and the drive ring can be achieved by tightening the screws, thereby improving the overall stability of the machine seal, thereby facilitating the connection between the machine seal and the pump shaft, and also facilitating the disassembly and replacement of the machine seal on the pump shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model provides a schematic diagram of the three-dimensional structure of a container-type mechanical seal for a double-suction pump;

[0017] Figure 2 The utility model provides a schematic cross-sectional view of a mechanical seal sleeve structure of a cartridge mechanical seal for a double-suction pump;

[0018] Figure 3 The utility model proposes a schematic diagram of the installation structure of a static ring assembly of a cartridge-type mechanical seal for a double-suction pump;

[0019] Figure 4 for Figure 3Schematic diagram of the local enlarged structure at point A.

[0020] Legend: 1. O-ring 1; 2. Mechanical seal sleeve; 3. Mechanical seal dynamic ring assembly; 4. Mechanical seal static ring assembly; 5. Mechanical seal cover; 6. Fastening screw; 7. Drive ring; 8. Positioning piece; 9. O-ring 2; 10. Spring; 11. Pump shaft; 12. Connector; 13. Limiting ring; 14. Connecting rod; 15. Auxiliary ring. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1: Reference Figure 1 - Figure 4 As shown: a container-type mechanical seal for a double-suction pump, comprising a pump shaft 11, a mechanical seal sleeve 2 is inserted through the outside of the pump shaft 11, an auxiliary mechanism is provided on the outer ring surface of the mechanical seal sleeve 2, the auxiliary mechanism comprises a mechanical seal dynamic ring assembly 3, a mechanical seal static ring assembly 4 and a limit ring 13, one side of the mechanical seal dynamic ring assembly 3 is fixedly connected to the mechanical seal static ring assembly 4, one side of the mechanical seal static ring assembly 4 is overlapped with the mechanical seal pressure cover 5, a connector 12 is inserted on one side of the mechanical seal dynamic ring assembly 3, a concave groove is provided on the outer ring surface of the connector 12, a spring 10 is installed in the concave groove, the outer ring surface of the connector 12 is connected to the limit ring 13 by a thread, a plug-in rod 14 is inserted through the inside of the limit ring 13, and one end of the plug-in rod 14 is plugged into the mechanical seal pressure cover 5.

[0024] An auxiliary ring 15 is overlapped on the outer ring surface of the machine seal sleeve 2, and the outer ring surface of the auxiliary ring 15 is fixedly connected to the connecting piece 12. An O-ring 1 is embedded in the inner wall of the machine seal sleeve 2, and the pump shaft 11 is inserted through the inside of the O-ring 1. An O-ring 29 is embedded on one side of the machine seal cover 5, and a guide hole is provided on one side of the O-ring 29.

[0025] The lap joint of the dynamic ring assembly 3 and the static ring assembly 4 on one side of the mechanical seal can be used to limit the installation of one side of the connecting piece 12, and the spring 10 can assist the use of the connecting piece 12, so that the dynamic ring assembly 3 of the mechanical seal is tightly connected with the connecting piece 12, and the static ring assembly 4 is tightly connected with the mechanical seal cover 5, and the auxiliary ring 15 can be used to seal and protect one side of the mechanical seal sleeve 2, reducing the loosening of the connection between the mechanical seal sleeve 2 and the connecting piece 12. The external thread on the connecting piece 12 is convenient for the installation and use of the limit ring 13 outside the connecting piece 12, and the connection between the limit ring 13 and the mechanical seal cover 5 can be achieved through the plug-in rod 14, thereby limiting the use position of the limit ring 13, and the limit ring 13 is used to support and reinforce one side of the mechanical seal cover 5, thereby improving the stability of the mechanical seal cover 5 when in use, making the mechanical seal a stable whole, which is convenient for the subsequent separate pressure and water leakage test of the mechanical seal, and the sealing effect of the inner wall of the mechanical seal sleeve 2 can be improved by the O-ring 1.

[0026] Example 2: Figure 3 and Figure 4 As shown, the outer ring surface of the machine seal sleeve 2 is sleeved with a drive ring 7, and positioning holes are provided on one side of the drive ring 7 and the machine seal sleeve 2. A positioning piece 8 is engaged with one side of the drive ring 7, and the inner ring surface of the positioning piece 8 is engaged with the machine seal cover 5. One side of the positioning piece 8 overlaps with the machine seal cover 5. The positioning piece 8 is a semi-ring structure, and the two positioning pieces 8 are engaged with each other. The positioning piece 8 is connected to a fastening screw 6 through a thread, and the end of the fastening screw 6 passes through the side wall of the drive ring 7.

[0027] The drive ring 7 can be used to wrap and protect one end of the machine seal sleeve 2, and the installation position of the machine seal cover 5 on the outer ring surface of the machine seal sleeve 2 can be limited, thereby limiting the right side of the machine seal cover 5. The engagement of the positioning piece 8 with the drive ring 7 and the machine seal cover 5 can reduce the odor of the drive ring 7 and the machine seal cover 5 outside the machine seal sleeve 2, and achieve the connection between the drive ring 7 and the machine seal cover 5. The connection between the positioning piece 8 and the drive ring 7 can be reinforced by fastening the screw 6, thereby improving the limiting effect of the positioning piece 8 on the machine seal cover 5 and the drive ring 7, and improving the stability of the entire machine seal during use. Therefore, the connection between the machine seal and the pump shaft 11 can be achieved by fastening the screw 6 through the machine seal sleeve 2.

[0028] The use method and working principle of this device are as follows: First, install the standard bulk mechanical seal dynamic ring assembly 3 on the mechanical seal sleeve 2, and position it on the step of the mechanical seal sleeve 2. Assemble the mechanical seal static ring assembly 4 into the mechanical seal gland 5, and pass the mechanical seal sleeve 2 through the mechanical seal gland 5. Use the drive ring 7 to limit the mechanical seal gland 5 and the mechanical seal sleeve 2. Then install the positioning piece 8 on the outer ring surface of the drive ring 7, turn the fastening screw 6, fix the mechanical seal sleeve 2, ensure that the compression amount of the spring 10 fits the sealing surface, and then turn the limit ring 13 on the outer ring surface of the connector 12 until one side of the limit ring 13 is flush with the left side of the connector 12, and then on the limit ring 13 A plug-in rod 14 is installed between the mechanical seal cover 5 to realize the connection between the limit ring 13 and the mechanical seal cover 5, completing the assembly of the entire mechanical seal, and installing the assembled container mechanical seal on the pump shaft 11. The mechanical seal is fixed to the housing with bolts, and the fastening screws 6 are locked on the pump shaft 11. The mechanical rotating part rotates with the rotation of the pump shaft 11. Remove the positioning piece 8 and connect the flushing water pipe on the pump to the mechanical seal flushing interface to complete the installation and use of the mechanical seal. The cost is low, the disassembly and maintenance are convenient, the use is stable, and the service life is long. When the container mechanical seal leaks, the convenient disassembly and maintenance can reduce the difficulty of on-site maintenance, thereby improving the quality of on-site maintenance.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A cartridge seal for a double-suction pump, comprising a pump shaft (11), characterized in that: A machine seal sleeve (2) is inserted through the outside of the pump shaft (11), and an auxiliary mechanism is provided on the outer ring surface of the machine seal sleeve (2), and the auxiliary mechanism includes a machine seal dynamic ring assembly (3), a machine seal static ring assembly (4) and a limit ring (13). One side of the machine seal dynamic ring assembly (3) is fixedly connected to the machine seal static ring assembly (4), and one side of the machine seal static ring assembly (4) is overlapped with the machine seal pressure cover (5). A connector (12) is inserted into one side of the machine seal dynamic ring assembly (3), and a concave groove is provided on the outer ring surface of the connector (12), and a spring (10) is installed in the concave groove. The outer ring surface of the connector (12) is connected to the limit ring (13) through a thread, and a plug rod (14) is inserted through the inside of the limit ring (13), and one end of the plug rod (14) is plugged into the machine seal pressure cover (5).

2. The cartridge seal for a double-suction pump according to claim 1, characterized in that: The outer ring surface of the mechanical seal sleeve (2) is overlapped with an auxiliary ring (15), the outer ring surface of the auxiliary ring (15) is fixedly connected to the connecting piece (12), the inner wall of the mechanical seal sleeve (2) is embedded with an O-ring (1), and the pump shaft (11) is inserted through the inside of the O-ring (1).

3. The cartridge seal for a double-suction pump according to claim 1, characterized in that: An O-ring 2 (9) is embedded on one side of the mechanical seal cover (5), and a guide hole is provided on one side of the O-ring 2 (9).

4. The cartridge seal for a double-suction pump according to claim 1, characterized in that: The outer ring surface of the machine seal shaft sleeve (2) is sleeved with a drive ring (7), and positioning holes are provided on one side of the drive ring (7) and the machine seal shaft sleeve (2).

5. The cartridge seal for a double-suction pump according to claim 4, characterized in that: A positioning piece (8) is engaged with one side of the driving ring (7), an inner ring surface of the positioning piece (8) is engaged with the machine seal gland (5), and one side of the positioning piece (8) is overlapped with the machine seal gland (5).

6. The cartridge seal for a double-suction pump according to claim 5, characterized in that: The positioning pieces (8) are of a semi-ring structure, and the two positioning pieces (8) are engaged with each other.

7. The cartridge seal for a double-suction pump according to claim 6, characterized in that: The positioning piece (8) is connected to a fastening screw (6) via a thread, and the end of the fastening screw (6) passes through the side wall of the driving ring (7).

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