CN103363118A

CN103363118A - Air pressure closing type mechanical seal

Info

Publication number: CN103363118A
Application number: CN2013103412723A
Authority: CN
Inventors: 石俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2013-10-23

Abstract

Disclosed is a mechanical seal device with air pressure serving as initial closing force of a seal end face. According to the air pressure closing type mechanical seal, a stationary seal ring in the mechanical seal is used as a compensating ring of the mechanical seal, and a pressure cavity is formed in the back portion of the compensating ring (stationary ring). When the compensating ring (stationary ring) is inserted into the pressure cavity, an annular air cylinder structure can be formed. Air with certain pressure is led into the pressure cavity, so that air pressure acts on the back portion of the compensating ring (stationary ring) through the pressure cavity, and the air pressure can serve as the initial closing force needed by the seal face of the mechanical seal.

Description

The mechanical seal of air pressure closo

Technical field

The present invention relates to a kind of mechanical seal device, what be specifically related to is a kind of with the mechanical seal device of gas pressure as the required first closure power of mechanical seal sealing surface.

Background technique

Mechanical seal has that sealing is reliable, leakage rate is little, long service life, the advantage such as applied widely, has been widely used in the rotating equipment of the various required sealings such as all kinds of pumps, reactor.Therefore its performance and life-span directly affect and are determining the integral working of equipment, improve its performance and the life-span seems most important.

Mechanical seal is in running, and its required seal face first closure advocates to provide by the elastic element (such as Compress Spring) that is arranged on mechanical seal compensated loop back.Therefore mechanical seal is in operation process, along with the time history meeting produces following problem: (1) is owing to the required first closure power of sealing surface of mechanical seal is provided by elastic element, and the elastic force that elastic element produces by compressive strain is difficult to act on uniformly on the whole sealing surface, this will have influence on first closure power in the distribution of sealing surface, the local heel and toe wear that causes sealing surface, so that the sealability of mechanical seal descends the lost of life; (2) mechanical seal end surface can be slowly in running wearing and tearing and so that the decrement of elastic element diminish, and the elastic element in the mechanical seal also can produce fatigue and permanent deformation because being in for a long time compressive state, thereby have influence on the work elastic force of elastic element, this will cause the required first closure power of seal face not enough, leaks so that mechanical seal produces.The existence of these factors directly affects performance and the working life of mechanical seal.

In sum, develop a kind of can addressing the above problem, seal the mechanical seal device in working life with raising sealability, prolonged mechanical and seem particularly important.

Summary of the invention

The objective of the invention is to overcome the prior art deficiency, for the problems referred to above that produce in the mechanical seal operation process, propose a kind of with the air pressure closo mechanical seal device of gas pressure as seal face first closure power.

The present invention addresses the above problem by the following technical programs.Main points of the present invention are to abandon the prior elastic element (for example Compress Spring) that makes end face produce first closure power in mechanical seal, use the gas (such as nitrogen) with certain pressure instead and act on the compensated loop back of mechanical seal, be used as the required first closure power of end face of mechanical seal with this.Its concrete structure is as follows: (1) is encircled the stationary ring of mechanical seal by way of compensation, and a pressure chamber is set at the stationary ring back, and compensated loop is inserted pressure chamber to form the structural type of a ring-type cylinder; (2) with cut-in pressure chamber, external adjustable solar term with pressure sources (for example nitrogen bottle adds reduction valve), allow gas pressure act on the compensated loop back by pressure chamber, make gas pressure as the required first closure power of mechanical seal end surface.

The present invention takes full advantage of the convenient adjusting of gas pressure and the uniform feature of pressure distribution, uses gas pressure as the required first closure power of mechanical seal end surface.Advantage of the present invention and effect are: (1) uses gas pressure as the first closure power of mechanical seal end surface, so that mechanical seal seal face in operation process stressed more even, the sealing surface closure is better, the sealing surface concentrated wear of effectively having avoided seal face to cause owing to unbalance stress.So not only can effectively improve the sealability of mechanical seal, and can prolonged mechanical the normal service life of sealing; (2) use gas pressure to replace prior elastic element elastic force as the first closure power of mechanical seal seal face, so that the required first closure power of the seal face of mechanical seal can be regulated by the air pressure size that changes pressure chamber easily, and can carry out pressure monitoring by instrument, so just effectively avoided because of sealing surface wear so that the elastic element decrement diminishes, elastic element produces permanent deformation so that elastic force descends, the seal face first closure power that causes is not enough and the seal leakage problem of generation.So just can effectively ensure the normal operation of mechanical seal, thereby improve usability and the life-span of mechanical seal.

Description of drawings

Fig. 1 is that structure of the present invention is implemented schematic diagram.

Among the figure:

1, nitrogen bottle 2, reduction valve 3, pressure gauge 4, atmosphere end pressure chamber

5, atmosphere end compensated loop (media end stationary ring) 6, media end compensated loop (media end stationary ring)

7, media end pressure chamber.

Embodiment

The present invention be directed to the improvement that defective of the prior art is carried out, the characteristic that has according to pressed gas itself designs, its concrete grammar is exactly that the stationary ring in the mechanical seal is encircled by way of compensation, at the compensated loop back pressure chamber is set, make compensated loop insert the structural type that pressure chamber forms a circular cylinder, by introduce the gas with certain pressure to pressure chamber, make gas pressure act on the compensated loop back by pressure chamber, be used as the required first closure power of seal face in the mechanical seal with this.

In accompanying drawing 1, provided the embodiment of the present invention in the Double End integrated mechanical sealing, as shown in the figure, pressure gas source is the pressurized gas in the nitrogen bottle 1 in this example, its pressure regulative mode is to regulate by reduction valve 2, the large I of pressure after the adjusting shows by pressure gauge 3, and the certain pressure gas after regulating is introduced pressure chamber (atmosphere end pressure chamber 4 and media end pressure chamber 7); Act on the back of compensated loop (atmosphere end compensated loop 5 and media end compensated loop 6) by pressure chamber (atmosphere end pressure chamber 4 and media end pressure chamber 7) through the gas after the pressure regulation; Make gas pressure as the purpose of the required first closure power of the seal face of mechanical seal thereby reach.

Claims

1. mechanical seal device, it is characterized in that: the required first closure power of sealing surface is provided by gas pressure in the mechanical seal.

2. mechanical seal device according to claim 1, it is characterized in that: the stationary ring in the mechanical seal is the compensated loop as mechanical seal, back at compensated loop (stationary ring) is provided with pressure chamber, the structural type of a circular cylinder will can be formed behind compensated loop (stationary ring) the insertion pressure chamber, by the gas of certain pressure is introduced pressure chamber, so that gas pressure acts on compensated loop (stationary ring) back, make gas pressure as the purpose of the required first closure power of sealing surface in the mechanical seal to reach.

3. mechanical seal device according to claim 1, it is characterized in that: the gas that is injected into pressure chamber comes from external gas source, and its gas pressure size can be regulated and shows by instrument through the gas pressure controlling device.