JPS61103062A - Packing - Google Patents

Abstract

PURPOSE:To provide a packing with excellent thermal and sliding properties and improved strength by making the graphite grain amount compounded in a knitting yarn passing through packing corners less than that not passing through the packing corners. CONSTITUTION:A knitting yarn 1a passing through a third path 23 consists of a plurality of PTFE fibers closely bundled and uniformly compounded with 70wt% of graphite grains mixed with PTFE resin grains to provided fibers. This knitting yarn 1a has excellent sliding property, thermal conductivity, etc. On the other hand, a knitting yarn 1b passing through first and second paths 21, 22 consists of a plurality of PTFE fibers closely bundled and uniformly compounded with 50wt% of graphite grains mixed with PTFE resin grains to provide fibers, and has excellent pressure resisting property.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a pressure-resistant and excellent packing material, such as a gland packing, which is suitably used in the delivery section of a fluid machine.

(b) Background of the Invention Traditionally, numerous tetrafluoroethylene resin fibers (
Hereinafter, it will be referred to as PTFE fiber.

) are tightly bundled to form a knitting yarn, and these yarns are braided together to form a knitting yarn (Punkin is generally known as a knitting yarn. In addition, it had drawbacks such as poor thermal conductivity and poor lubricant retention, and its performance as a seal was not at all desirable, but it was grade D.

M〈As a patchkin with improved defects, special public service 1986-17
As stated in the invention disclosed in Publication No. 261, graphite particles are uniformly mixed. There is a package made of knitted yarn made of PTFE fibers, which can overcome the above-mentioned drawbacks and significantly improve the performance of the package. Value is a shaft frame PT
Although Orihime has fundamentally different properties compared to FE fiber,
Black-A 1 M child's electric combination flit can also be changed to the extent that its properties are summerized after that +
t7) I found out through research. dll et al. found that when the amount of graphite particles added to PTF E fibers was increased evenly, the thermal conductivity and lubricity of the fibers improved. On the other hand, there is a tendency for the fiber strength to gradually decrease and the elongation to increase. Therefore, for example, if a packing braided with threads made of PTFEf and male containing a large amount of graphite particles is used in the shaft sealing device of a pump under A load condition, the thread body is likely to cause stress distortion. As a result, the packing is deformed and the contact layer l#I product with the river increases, so that the lifespan is not very extended. Therefore, in order to prevent the deformation of the gasket under such high loads, absorbent adapter gaskets are placed at both ends of the gasket, and spacer rings of te/IIIt are placed between the gaskets. I had to pay for moxibustion and other things.

09 Almost Ming J) Purpose The present invention has the flattened thermal properties and sliding properties of uniformly blended PTFE fibrous rice, while at the same time greatly improving the frequency characteristics as a packing material. The first object of the present invention is to provide a gasket with good pressure resistance.

In addition, the pump, agitation pump, valve, etc. 7) If installed in the cap seal part of the flow side part, the gap between the shaft and the casing and the crack that may fall in the cap seal part during extended use. The second objective is to provide a seal that does not protrude from gaps, etc.

2) Summary of the Invention 4 - The invention relates to a so-called mocking tie 7゛ packing made of a plurality of granite threads (multiple threads with a large number of threads), which are blended with graphite particles. In a patchkin formed by braiding a thread made of polytetrafluoroethylene resin, the graphite particles in the knitted thread passing through the corners of the patch do not pass through the entire corner of the patch. fK-characterized by a packing having a structure smaller than that of the particle mixing lid.

(e) Effects of the invention According to Fukaimei, it has the following effects.

In the case of <i) and J) Tjll packing, the corner of the packing is the most prone to damage and collapses from this part. Feed yarn) K Contains graphite particles with a small amount of lid (Blend in the range of 20 wt % to 55 wt % to 9 g) P
Since TFE@fiber is used, the fiber strength is strong, and the packing has reinforced corners, which can eliminate such drawbacks.

+21 /< Many graphite particles are added to the yarn that does not go back to the corner of the fabric (that is, the knitting yarn that forms t-m other than the corner of the fabric) (compounded in the range of 60 weight S to 80 fi@chi) PT
Since the FE fiber m is used, the packing itself has excellent thermal properties and wJ properties.

(3) Since the knitting yarn is made of PTFE fiber with graphite particles evenly mixed in it, it is made of two types of knitting yarns with different properties depending on the amount of graphite particles mixed.
It becomes a gasket with good pressure resistance.

(4) In addition, the θ prevents the gasket from protruding from the gap between the casing of the fluid machine and the field, or the gap between the sleeve and the gasket holding plate, and the adapter gasket used to prevent deformation of the gasket. Pacer ring causes severe anxiety.

(f) Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a partial side view showing the same embodiment of the packing according to the invention, and Fig. 2 is an explanatory diagram of the passage path of the knitting yarn in the second embodiment. knitting yarn 1
a, lb'i is a total of 12 to 36 threads, and the threads pass through the first path 21 and the second path 22, which go back through the corner of the packing, and do not pass through the corner of the packing. It consists of a total of three routes, a third route 23 passing through the center of the gasket.

The knitting yarn 1 a I/i passing through this third path 23 is 70% by weight (the preferred range is 6% by weight)
0 to 80% by weight) is mixed with PTFE and Q resin particles and made into fibers.
A large number of TFEfi vertebrae are tightly bundled together, and this knitting yarn 1a has characteristics such as graphite particle quality that are positive factors for packing, but as a negative factor, fiber strength is slightly low. I regret that the situation is declining.

On the other hand, for 1 bfd of knitting yarn passing through the first path 21 and the second path 22, the blending amount of graphite particles is 50% by weight (preferable range is 20 to 20% by weight).
It has excellent pressure resistance and is made by tightly bundling a large number of PTFE fibers, which are uniformly blended with graphite particles obtained by mixing with TFH resin particles and forming fibers.

Further, FIGS. 3 and 4 are a partial view showing another embodiment of the packing according to the present invention and an explanatory view of the passing route of the knitting yarn. The grid is made up of a total of four routes: 4 to 21 and a second route 22 that follow the corners of the packing, and a third route 23 and a fourth route 24 that do not follow the packing corner, and a third route 23 and a fourth route 24. In the knitting yarn, the aforementioned JD = yarn 1a is passed through the second path 2
The above-mentioned knitting yarn 1b is used for the paulownia threads of the first and second paths 22,
Each is used.

As can be understood from the above examples, the packing according to the present invention has a knitting yarn 1 which is hard and has a large fiber strength (tensile strength) and is hard to cause stress distortion as a loose yarn leaking through the corner of the packing.
Since it uses B, compared to the conventional packing made of P T F E Ffi fibers filled with graphite particles and braided using L Qi, it has lower pressure resistance,
The shape retention is extremely good, so the working flow and pressure are 20
Rotary pumps, etc. under intelligent conditions tD I! Even when used in the 11 i1 device, there was no so-called protrusion phenomenon of the padskin, and the layer life of the padskin layer was almost doubled because it was braided with two types of fibers with different properties. In addition, there is no longer any need for the conventional method of inserting hard adapter gaskets or arranging spacer rings at both ends of the gaskets or between the gaskets to prevent deformation of the gaskets.

Incidentally, to give an uninvented experimental example, (Experimental Example 1.; Rotation test) A knitting yarn 1b was made using PTFE fibers containing 30% by weight of graphite particles. %
A packing was obtained by braiding the knitting yarn 1a of the blended PTFE fibers so that the knitting yarn 1b passed through the corners of the packing. A plurality of such seals (4 rings) are used to seal the shaft of a rotary pump, and the fluid pressure is 15
Tests were conducted under conditions of ~10% speed, but there was no deformation of the seal at all, and good sealing performance was exhibited over a long period of time.

(Example 2; Fiber properties) The fiber properties of the knitting yarn used in the present invention are shown in FIG.

To explain Figure 5, the horizontal axis is the fiber elongation rate (unit: %),
The vertical axis shows fiber strength (unit: gram/denier).

The area A surrounded by the horizontal axis and the line is where the kIL fiber strength is (lu
The fiber has an elongation of 13% or more in terms of g/d, and exhibits an unfavorable position as a packing material. In addition, L deception is
This is a PTFE fiber blended with 80 wt% of graphite particles. Similarly, the area B surrounded by the vertical axis and 0 also shows chain acid, which is not preferable as a packing material, and the fiber strength is 0.8.
Indicates fibers with an elongation rate of 6% or less even at 5 g/d or more. Note that G#i is PTF containing 20wt of graphite particles.
Shows the temporality of E fibers. In Fig. 5, each plot indicated by O mark, Δ mark, and square mark is one actual measurement, and ○ mark contains graphite particles at 30w%, Δ mark contains graphite particles at 50w%,
The seal is made of PTFE fibers containing 70 wt% of graphite particles. Ffi contains 5 graphite particles.
This is the characteristic line of the P'TFE fiber containing 5wt, and the range of -1n between the F line and 04M is the fiber in the range where the elongation rate is low compared to the fiber strength. Also, the range C surrounded by the F line and the E line is suitable for configuring parts other than the uninvented packing periphery. The reason why it is preferable to blend the graphite particles in an amount of 6C to 80Wt is probably due to the fact that the graphite particles are preferably blended in an amount of 6C to 80Wt.

[Brief explanation of the drawing]

FIG. 1 is a partial side view showing one embodiment of the packing according to the present invention, FIG. 2 is an explanatory diagram of the passage path of the thread of the same embodiment, and FIG. 3 is a partial side view showing an embodiment of the packing according to the present invention. FIG. 4 is an explanatory diagram of the passing path of the knitting yarn of Example 15j, and FIG. 5 is a partial side view showing one embodiment. FIG. It is a characteristic diagram showing a relationship. 1 a
...Second route, 23...Third route 24...Fourth route Patent applicant Nippon Pillar Industries Co., Ltd. Figure 2 - Figure 4 figure

Claims (1)

[Claims] (1) In a packing formed by braiding a plurality of knitting yarns made of tetrafluoroethylene resin fibers uniformly blended with graphite particles, the graphite particle content of the knitting yarn passing through the corners of the packing is A packing characterized by containing less graphite particles than the amount of graphite particles in the knitting yarn that does not pass through the corners.