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Negative pressure dual-stage leakage-free seal device

A sealing device, leak-free technology, applied in the components of the pumping device for elastic fluids, non-variable-capacity pumps, machines/engines, etc., can solve problems such as medium leakage, achieve good sealing effect, and ensure the sealing effect. Effect

Inactive Publication Date: 2013-12-18
江苏联成节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the phenomenon of medium leakage caused by the separation of the sealing surfaces of the moving ring and the static ring due to the pressure of the medium and flushing fluid being greater than the pressure of the spring and the influence of vibration during operation in the existing single-end mechanical seal, and proposes a negative pressure seal. Booster reverse-mounted double-stage sealed pump

Method used

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  • Negative pressure dual-stage leakage-free seal device

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Embodiment Construction

[0009] Such as figure 1 As shown, the present invention connects the impeller 1 at the front end of the main shaft 9, coaxially arranges the shaft sleeve 6 and the pump cover 2 outside the main shaft 1, and sets the isolation cavity cover 8 at the rear end of the pump cover 2, and the rear end of the shaft sleeve 6 passes through the Place it in the middle hole of the isolation cavity cover 8, and set the skeleton oil seal 7 between the isolation cavity cover 8 and the shaft sleeve 6.

[0010] A cylindrical spacer sleeve 4 is set between the shaft sleeve 6 and the pump cover 2, and an annular boss 10 is provided at the rear end of the spacer sleeve 4. The annular boss 10 is arranged between the pump cover 2 and the isolation cavity cover 8, Two radial through holes 11 are provided on the annular boss 10, and sealing rings are provided between the annular boss 10 and the pump cover 2, and between the annular boss 10 and the isolation cavity cover 8 respectively.

[0011] A sec...

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Abstract

The invention discloses a negative pressure dual-stage leakage-free seal device and relates to pump seal technology. A spindle shaft and a pump cover are coaxially disposed outside a spindle. An isolation cavity seal cover is disposed at the rear end of the pump cover. A cylindrical isolation sleeve which is located on the inner side of the isolation cavity seal cover is disposed between the spindle sleeve and the pump cover. An annular boss is disposed connected to the rear end of the isolation sleeve and disposed between the pump cover and the isolation cavity seal cover. A second-stage mechanical seal device with a spring is disposed between the cylindrical isolation sleeve and the spindle sleeve. A radial through hole is formed in the annular boss. A framework oil seal is disposed between the isolation cavity seal cover and the spindle sleeve. A first-stage mechanical seal device with a spring is disposed between the cylindrical isolation sleeve and the pump cover. A communicating hole is formed at the front end of an impeller. The inner end of communicating hole is located at rear end of the impeller in the pump cover. By the negative pressure dual-stage leakage-free seal device, good seal effect can be ensured.

Description

technical field [0001] The invention relates to the technical field of pump production, in particular to the sealing technology of high-temperature pumps. Background technique [0002] Most of the existing pumps use single-end mechanical seals, and the dynamic seal is to use the spring force to promote the tight combination of the sealing surface of the sealing ring and the static ring, so as to prevent leakage. However, because the pump is affected by the type of medium, the pressure of the medium in the sealing chamber and the vibration during operation, the spring force will be weakened, and the pressure of the medium or the thrust of the vibration will be greater than the pressure of the spring, so that the moving ring and the static ring will be separated, resulting in sealing invalidated. Contents of the invention [0003] The purpose of the present invention is to solve the phenomenon of medium leakage in the existing single-end mechanical seal due to the pressure ...

Claims

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Application Information

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IPC IPC(8): F04D29/10
Inventor 陈进董洪志周民
Owner 江苏联成节能科技有限公司
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