CN201137699Y

CN201137699Y - Low ignition loss graphite weaving buchan

Info

Publication number: CN201137699Y
Application number: CNU2007203032739U
Authority: CN
Inventors: 孙锦龙
Original assignee: GUOTAI SEAL MATERIAL CO Ltd ZHEJIANG PROV
Current assignee: GUOTAI SEAL MATERIAL CO Ltd ZHEJIANG PROV
Priority date: 2007-12-21
Filing date: 2007-12-21
Publication date: 2008-10-22
Anticipated expiration: 2017-12-21

Abstract

The utility model discloses a low ignition loss black lead knitting Buchan, which is knitted by flexible black lead. The utility model is characterized in that a carbon fiber line is arranged in the flexible black lead, the outer portion of the carbon fiber line is wrapped with flexible black lead, and the carbon fiber line and the flexible black lead are compressed to be compounded. The ignition loss of the low ignition loss black lead knitting Buchan is less than and is equal to 5% in one hour under 450DEG C oxidation state. Flexible carbon fiber line which is got by the utility model is fine and regular, the size is standard, the density is even, and the intensity is obviously improved, and extrusion resistance property of Buchan products which are knitted by the flexible carbon lead is guaranteed on a certain extent under high temperature and high pressure. The basic size of the Buchan under high temperature is stable, the low ignition loss black lead knitting Buchan guarantees that products can be applied in the working environment with higher temperature, which solves the problem of running, emitting, dripping and leaking.

Description

Low ignition loss graphite braiding packing

Technical field

The utility model relates to a kind of sealing material, especially a kind of be widely used in industry axis such as oil, chemical industry, chemical fibre, papermaking, medicine, electric power, environmental protection, smelting, pump, valve, pipe, static and dynamic sealing, especially for the low ignition loss graphite braiding packing of the dynamic and static sealing in corrosion-resistant, high temperature, high pressure, the more high environment of linear velocity.

Background technique

All the time, domestic flexible graphite stuffing, the reinforcing material that uses in the Expanded graphite line is materials such as cotton thread, glass fibre, when the higher temperature occasion is used, because of the burning of inner reinforcing material and Bond is lost, product size stability, crush resistance are descended, produce " run, drip, leak ", cause seal failure.

Summary of the invention

Technical problem to be solved by this invention provides that a kind of crush resistance under high temperature, high pressure is good, ignition loss is low, the low ignition loss graphite braiding packing of dimensionally stable.

It is this low ignition loss graphite braiding packing that the present invention solves the problems of the technologies described above the technological scheme that is adopted, form by the braiding of Expanded graphite line, its structural feature is: described Expanded graphite line inside is provided with carbon fiber line, the carbon fiber line external packets is wrapped with Expanded graphite, carbon fiber line and Expanded graphite press compound, described low ignition loss graphite braiding packing under 450 ℃ of oxidation state 1 hour ignition loss smaller or equal to 5%.

Carbon fiber line intensity level described in the utility model is more than or equal to 3.5MPa, and Kohlenstoffgehalt is more than or equal to 90%.

Be provided with 1～5 carbon fiber line in the graphite cross section described in the utility model.

Carbon fiber line described in the utility model is 3K-6K.

The present invention compares with prior art and has the following advantages and effect: 1, when making flexible graphite belt carbon fiber line is added in the flexible graphite belt, make by twisting thread carbon fiber line can be well and Expanded graphite be blended together, clean neat, the dimensional standard of the Expanded graphite linear light of gained, density are even, intensity obviously improves, and has guaranteed packing product crush resistance under High Temperature High Pressure of using this Expanded graphite line braiding to be made to a certain extent.2, adopt special take off cotton, processings of coming unstuck, make this packing at high temperature base dimension stablize, guaranteed that product can be applied in the working environment of higher temperature, has solved the problem of " run, drip, leak ".

Description of drawings

Fig. 1 is the utility model flexible graphite belt cross-sectional structure schematic representation.

Fig. 2 is the utility model Expanded graphite line cross-sectional structure schematic representation.

Embodiment

Referring to Fig. 1, Fig. 2, the utility model adopts 4 braidings of Expanded graphite line to form, Expanded graphite 1 self Kohlenstoffgehalt reaches more than 99.5%, therefore ignition loss under its high temperature, thermal conductivity are all better, and that Expanded graphite 1 itself has good self lubricity, friction factor and abrasion loss is extremely low, have simultaneously good anti-corrosion again, therefore the product of making for basic material of Expanded graphite 1 also has above these speciality.

Inside is provided with carbon fiber line 2 on described Expanded graphite line 4 cross sections, and carbon fiber line 2 external packets are wrapped with Expanded graphite 1, and carbon fiber line 2 presses compound with Expanded graphite 1.When making Expanded graphite line 4, carbon fiber line 2 is added in the Expanded graphite line 4, make by twisting thread carbon fiber line 2 can be well and Expanded graphite 1 be blended together, bright and clean neat, the dimensional standard of the Expanded graphite line produced 4, density are even, intensity obviously improves, and has guaranteed the utility model crush resistance under High Temperature High Pressure to a certain extent.

When making with carbon fiber line enhancing Expanded graphite, originally in the system Wiring technology for guaranteeing content of graphite and reduce fabricating cost, carbon fiber line can not be put again too much, so in twisting process, do not have carbon fiber line place graphite to be easy to dephosphorization, twist with the fingers into line degree of finish, size and all do not reach requirement.For this reason, in Expanded graphite line 4 system Wiring technologies, for preventing Expanded graphite line 4 dephosphorization of twisting thread, flexible graphite belt 5 is being placed the cotton thread 3 that also evenly places 21 thicknesses on carbon fiber line 2 bases simultaneously, placement spacing between the cotton thread 3 is 2.1mm, twist with the fingers Expanded graphite line 4 degree of finish, size, density, the uniformity of coming out and to reach requirement, and do not have the dephosphorization phenomenon.But because of cotton thread 3 high temperature resistant degree are very low, for guarantee to adopt packing that 4 braidings of Expanded graphite line come out 450 ℃ of 1 hour ignition losss less than 5%, adopted the low temperature volatile material pre-burning below 300 ℃ to lose treatment process in the production process.Through test of many times, in baking oven, be warmed up to 250 ℃ and take off cotton thread and handle having woven the blank packing, just be shaped to the packing that adheres to specification at last.Make this type of packing at high temperature packing and dimensionally stable like this, have and to compensate general size error that this has just guaranteed that product can be applied in the working environment of higher temperature, has solved the problem of " run, drip, leak ".

The carbon fiber line 2 that is provided with in the utility model Expanded graphite line 4 is 3K-6K, and the carbon fiber line radical of setting is the 1-5 root.

The utility model flow:

Graphite expansion → Expanded graphite and high modulus carbon fiber line be compound → and cut open and be with → twist thread → weave → take off cotton to come unstuck → moulding → packing

The utility model performance index:

Claims

1, a kind of low ignition loss graphite braiding packing, form by the braiding of Expanded graphite line, it is characterized in that: described Expanded graphite line inside is provided with carbon fiber line, the carbon fiber line external packets is wrapped with Expanded graphite, carbon fiber line and Expanded graphite press compound, described low ignition loss graphite braiding packing under 450 ℃ of oxidation state 1 hour ignition loss smaller or equal to 5%.

2, low ignition loss graphite braiding packing according to claim 1, it is characterized in that: described carbon fiber line intensity level is more than or equal to 3.5MPa, and Kohlenstoffgehalt is more than or equal to 90%.

3, low ignition loss graphite braiding packing according to claim 1 is characterized in that: be provided with 1～5 carbon fiber line in the described Expanded graphite line cross section.

4, according to claim 1 or 2 or 3 described low ignition loss graphite braiding packings, it is characterized in that: described carbon fiber line is 3K-6K.