External mechanical seal for submersible sewage pump

Abstract

The utility model discloses an external mechanical seal for a submersible sewage pump, which relates to the field of mechanical seals and comprises a pump shaft and a pump casing, a gland is arranged on the side wall of the pump casing, mounting holes are arranged on the periphery of the gland and the pump casing, mounting bolts are connected in the mounting holes, a static ring groove is arranged on the right side of the gland, and a static ring is arranged in the static ring groove. An elastic compensation base is arranged on the outer side of the pump shaft, a plurality of small springs are connected to the left side of the elastic compensation base, the other ends of the small springs are connected with a pressing ring, and a movable ring is arranged on the side wall of the pressing ring. According to the utility model, by rotating the mounting bolt, the mounting bolt extrudes the inclined surface of the insertion rod, so that the insertion rod moves into the placing groove, the insertion rod pulls the extrusion plate, the extrusion plate extrudes the reset spring, so that the reset spring deforms, and the insertion rod penetrates through the insertion groove and extends into the insertion hole in the static ring, so that the static ring is limited; the stability of the static ring can be effectively improved, and the problem that the first O-shaped sealing ring is abraded due to rotation of the static ring is solved.

Description

Technical Field

[0001] The utility model relates to the field of mechanical seals, in particular to an externally mounted mechanical seal for a submersible sewage pump. Background Technique

[0002] A submersible sewage pump is a submersible sewage pump, which is particularly suitable for transporting liquids containing hard solids, fibrous substances, as well as particularly dirty, sticky, and slippery liquids. There are two types: AS and AV submersible sewage pumps. Mechanical seals are commonly used in the pump body of the submersible sewage pump, and mechanical seals are installed to prevent external media or oil in the oil chamber from entering the motor chamber.

[0003] Currently, when installing the stationary ring in the mechanical seal, the stationary ring is mostly directly clamped into the stationary ring cavity on the gland. The installation of the stationary ring is not stable enough. When the friction coefficient between the rotating ring and the stationary ring increases, it is easy to drive the stationary ring to rotate, resulting in wear of the O-ring on the stationary ring, which will affect the sealing effect of the mechanical seal.

[0004] Therefore, it is very necessary to invent an externally mounted mechanical seal for a submersible sewage pump to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide an externally mounted mechanical seal for a submersible sewage pump to solve the problems put forward in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: An externally mounted mechanical seal for a submersible sewage pump, including a pump shaft and a pump casing. A gland is provided on the side wall of the pump casing. Installation holes are provided around both the gland and the pump casing, and installation bolts are connected in the installation holes. A stationary ring groove is provided on the right side of the gland. A stationary ring is provided in the stationary ring groove. An elastic compensation seat is provided on the outer side of the pump shaft. A plurality of small springs are connected to the left side of the elastic compensation seat. The other ends of the plurality of small springs are connected to a pressing ring. A rotating ring is provided on the side wall of the pressing ring. The rotating ring is in contact with the stationary ring. Placement grooves are provided around the gland. A return spring is provided in the placement groove. An extrusion plate is provided on the top of the return spring. A plug rod is connected in the extrusion plate. An inclined surface is provided on the side wall of the plug rod. A slot corresponding to the plug rod is provided on the side wall of the placement groove. A jack corresponding to the plug rod is provided around the stationary ring.

[0007] Preferably, a sealing gasket is provided between the gland and the pump casing.

[0008] Preferably, a first sealing groove is provided on the outer side of the stationary ring, and a first O-ring is provided in the first sealing groove.

[0009] Preferably, a second sealing groove is provided on the inner side of the rotating ring, and a second O-ring is provided in the second sealing groove.

[0010] Preferably, threaded holes are provided around the elastic compensation seat, and fastening bolts are threadedly connected in the threaded holes.

[0011] Technical effects and advantages of the present utility model:

[0012] By rotating the mounting bolt, the mounting bolt presses against the inclined surface of the insertion rod, causing the insertion rod to move into the placement groove. The insertion rod pulls the extrusion plate, and the extrusion plate presses against the return spring, causing the return spring to deform. The insertion rod passes through the slot and extends into the insertion hole on the stationary ring, thereby limiting the stationary ring, effectively increasing the stability of the stationary ring, and avoiding the problem of wear on the first O-ring caused by its rotation. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 of the present utility model Figure 1 is an enlarged schematic diagram of part A of the present utility model;

[0015] Figure 3 of the present utility model Figure 1 is an enlarged schematic diagram of part B of the present utility model.

[0016] In the figure: 1, pump shaft; 2, pump casing; 3, gland; 4, mounting bolt; 5, stationary ring; 6, elastic compensation seat; 7, small spring; 8, pressing ring; 9, moving ring; 10, placement groove; 11, return spring; 12, extrusion plate; 13, insertion rod; 14, insertion hole; 15, sealing gasket; 16, first O-ring; 17, second O-ring; 18, fastening bolt. Specific Embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] The present utility model provides as Figures 1-3An externally mounted mechanical seal for a submersible sewage pump as shown, comprising a pump shaft 1 and a pump casing 2. A gland 3 is provided on the side wall of the pump casing 2. Mounting holes are provided around both the gland 3 and the pump casing 2, and mounting bolts 4 are connected in the mounting holes. A static ring groove is provided on the right side of the gland 3, and a static ring 5 is arranged in the static ring groove. An elastic compensation seat 6 is arranged outside the pump shaft 1. A plurality of small springs 7 are connected to the left side of the elastic compensation seat 6. The other ends of the plurality of small springs 7 are connected to a pressing ring 8. A dynamic ring 9 is arranged on the side wall of the pressing ring 8. The dynamic ring 9 is in contact with the static ring 5. Placement grooves 10 are provided around the gland 3. A return spring 11 is arranged in the placement groove 10. An extrusion plate 12 is arranged on the top of the return spring 11. A plug rod 13 is connected in the extrusion plate 12. An inclined surface is arranged on the side wall of the plug rod 13. A slot corresponding to the plug rod 13 is provided on the side wall of the placement groove 10. A jack 14 corresponding to the plug rod 13 is provided around the static ring 5. By placing the return spring 11 into the placement groove 10 and placing the plug rod 13 and the extrusion plate 12 in the placement groove 10, when connecting the gland 3 and the pump casing 2, by installing the static ring 5 in the static ring groove and making the jack 14 on the static ring 5 correspond to the plug rod 13, by rotating the mounting bolt 4, the mounting bolt 4 presses the inclined surface of the plug rod 13, causing the plug rod 13 to move into the placement groove 10. The plug rod 13 pulls the extrusion plate 12, and the extrusion plate 12 presses the return spring 11, causing the return spring 11 to deform. The plug rod 13 passes through the slot and extends into the jack 14 on the static ring 5, thereby limiting the static ring 5, which can effectively increase the stability of the static ring 5 and avoid the problem of the first O-ring 16 being worn due to its rotation.

[0019] A sealing gasket 15 is provided between the gland 3 and the pump casing 2, which can conveniently increase the sealing performance between the gland 3 and the pump casing 2.

[0020] A first sealing groove is provided on the outer side of the static ring 5, and a first O-ring 16 is arranged in the first sealing groove, which can conveniently increase the sealing performance of the static ring 5.

[0021] A second sealing groove is provided on the inner side of the dynamic ring 9, and a second O-ring 17 is arranged in the second sealing groove, which can conveniently increase the sealing performance of the dynamic ring 9.

[0022] Threaded holes are provided around the elastic compensation seat 6, and fastening bolts 18 are threadedly connected in the threaded holes. By rotating the fastening bolts 18, the stability of the installation of the elastic compensation seat 6 can be increased.

[0023] The working principle of the present utility model:

[0024] By placing the return spring 11 into the placement groove 10, and putting the insertion rod 13 and the extrusion plate 12 into the placement groove 10, when connecting the gland 3 with the pump housing 2, by installing the stationary ring 5 in the stationary ring groove and making the insertion hole 14 on the stationary ring 5 correspond to the insertion rod 13, by rotating the mounting bolt 4, the mounting bolt 4 presses the inclined surface of the insertion rod 13, causing the insertion rod 13 to move into the placement groove 10. The insertion rod 13 pulls the extrusion plate 12, and the extrusion plate 12 presses the return spring 11, causing the return spring 11 to deform. The insertion rod 13 passes through the slot and extends into the insertion hole 14 on the stationary ring 5, thereby limiting the stationary ring 5. By sleeving the moving ring 9 and the elastic compensation seat 6 on the pump shaft 1, the elastic force of the small spring 7 is used to push the moving ring 9 to fit with the stationary ring 5.

[0025] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An externally mounted mechanical seal for a submersible sewage pump, comprising a pump shaft and a pump casing, characterized in that: A gland is provided on the side wall of the pump casing. Mounting holes are provided around both the gland and the pump casing, and mounting bolts are connected in the mounting holes. A stationary ring groove is provided on the right side of the gland, and a stationary ring is arranged in the stationary ring groove. An elastic compensation seat is arranged outside the pump shaft. A plurality of small springs are connected to the left side of the elastic compensation seat, and the other ends of the plurality of small springs are connected to a pressing ring. A moving ring is arranged on the side wall of the pressing ring, and the moving ring is in contact with the stationary ring. Placement grooves are provided around the gland, and a return spring is arranged in the placement groove. An extrusion plate is arranged on the top of the return spring, and a plug rod is connected in the extrusion plate. An inclined surface is arranged on the side wall of the plug rod, a slot corresponding to the plug rod is provided on the side wall of the placement groove, and insertion holes corresponding to the plug rod are provided around the stationary ring.

2. The external mechanical seal for a submersible sewage pump according to claim 1, characterized in that: A sealing gasket is provided between the gland and the pump casing.

3. The externally mounted mechanical seal for a submersible sewage pump according to claim 1, characterized in that: A first sealing groove is provided outside the stationary ring, and a first O-ring is arranged in the first sealing groove.

4. The externally mounted mechanical seal for a submersible sewage pump according to claim 1, characterized in that: A second sealing groove is provided inside the moving ring, and a second O-ring is arranged in the second sealing groove.

5. The external mechanical seal for a submersible sewage pump according to claim 1, characterized in that: Threaded holes are provided around the elastic compensation seat, and tightening bolts are threadedly connected in the threaded holes.

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