KR101664089B1 - Method of manufacturing a sealing for high-pressure pump - Google Patents
Method of manufacturing a sealing for high-pressure pump Download PDFInfo
- Publication number
- KR101664089B1 KR101664089B1 KR1020150127022A KR20150127022A KR101664089B1 KR 101664089 B1 KR101664089 B1 KR 101664089B1 KR 1020150127022 A KR1020150127022 A KR 1020150127022A KR 20150127022 A KR20150127022 A KR 20150127022A KR 101664089 B1 KR101664089 B1 KR 101664089B1
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- KR
- South Korea
- Prior art keywords
- sealing
- weight
- silica
- ethanol
- carbon fiber
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/10—Extrusion moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Material Composition (AREA)
Abstract
The present invention relates to a method for producing a high-pressure pump sealing, characterized in that (A) 1.0 to 5.0% by weight of silica is added to 90 to 98% by weight of ultra high molecular weight polyethylene (UHMW-PE) Mixing; (B) heating the mixture to 80 to 90 占 폚 to evaporate ethanol, and adding 1.0 to 5.0% by weight of carbon fiber to the mixture; (C) sealing the additive in a mold and immersing the mold in oil heated at 150 to 200 DEG C for 30 to 120 minutes to melt the additive in a hot bath; And (D) extruding the melt at a pressure of 800 to 1,200 kg / f, and cooling the extrudate at room temperature to a size and shape suitable for the pump, thereby completing the sealing.
Accordingly, the present invention has an effect of reducing the economic loss due to the replacement by increasing the lifetime of the overall sealing.
Description
More particularly, the present invention relates to a method for manufacturing a high-pressure pump sealing which can increase the lifetime of the overall sealing and reduce the economic loss due to the replacement, and To a high-pressure pump seal manufactured by the same.
Normally, the nozzle of the high-pressure pump uses plastic sealing to prevent fluid leakage. In this case, when spraying the fluid through the nozzle, the sealing causes severe abrasion symptoms by repeating high pressure and rotation. Korean Unexamined Patent Publication No. 10-2005-0039797 "Airless Pump Packing" and Korean Registered Utility Model No. 20-0391421 "Packing for Pressure Pump" are proposed to improve this. The proposed document has a very economical and practical effect because it can prevent leakage of internal pressure by using Ultra Poly Ethylene (UPE) material.
However, the above-mentioned ultra-high molecular weight polyethylene is used only for about 50 hours, and when it is used more than this, leaking occurs and the problem of sealing one of the parts causes the cost and the trouble of replacing the entire nozzle . As a part of this, Korean Patent Laid-Open Publication No. 10-2008-0005905 "Seal material, resin ring using it and seal using it" is proposed. In the proposed literature, ultra high molecular weight polyethylene having an average molecular weight of 5,000 to 550 is used and a filler such as glass fiber, carbon fiber, graphite powder, ethylene fluoride resin, copper alloy, molybdenum disulfide is added thereto, .
However, when instantaneous high pressure is applied to the sealing, or when the sealing is rotated or moved at high speed together with the high pressure, there is a problem that the sealing breaks or falls off. That is, when observed under a scanning microscope, the particles of the additive added to the ultrahigh molecular weight polyethylene are not uniformly and densely dispersed. As a result, since the additive can not be performed properly, the overall compressive strength and abrasion resistance are inevitably lowered, and the defect rate is high, thereby increasing the manufacturing cost.
Accordingly, it is an object of the present invention to fundamentally solve the above-described problems of the prior art, and it is an object of the present invention to provide a method for producing a high- The present invention provides a method for manufacturing a high-pressure pump seal which improves abrasion resistance, compressive strength and adhesiveness as well as a sealing for a high-pressure pump manufactured thereby.
In order to achieve the above object, the present invention provides a process for producing a high-pressure pump seal comprising: (A) 90 to 98% by weight of ultrahigh molecular weight polyethylene (UHMW-PE), 1.0 to 5.0% by weight of silica, Mixing; (B) heating the mixture to 80 to 90 占 폚 to evaporate ethanol, and adding 1.0 to 5.0% by weight of carbon fiber to the mixture; (C) sealing the additive in a mold and immersing the mold in oil heated at 150 to 200 DEG C for 30 to 120 minutes to melt the additive in a hot bath; And (D) extruding the melt at a pressure of 800 to 1,200 kg / f and cooling the extrudate to room temperature to a size and shape appropriate for the pump, thereby completing the sealing .
At this time, the silica according to the present invention is prepared by mixing 0.1 to 5.0% by weight of silica powder having a spherical shape in 95 to 99.9% by weight of ethanol, and dispersing the particles by applying ultrasonic waves for 60 to 120 seconds Filtered, and dried naturally.
In addition, the carbon fiber according to the present invention may be produced by cutting a raw or plate-like raw material (carbon fiber) into 0.5 to 3.0 mm lengths, then immersing it in ethanol in a volume ratio of 1: 200, To disperse the particles, followed by filtration and naturally dried.
Also, the steps (A) and (B) according to the present invention are characterized in that the mixture is further stirred for 3 to 10 minutes at 1500 to 2500 rpm, followed by uniform mixing.
The sealing produced by the method according to the present invention is characterized in that silica particles of 10 to 50 mu m in diameter which improve abrasion resistance and strength are formed on ultrahigh molecular weight polyethylene and carbon fiber particles of 10 to 20 mu m which improve adhesion and workability are arranged in a line, Are arranged randomly and densely.
At this time, the sealing according to the present invention is characterized in that a site where silica and carbon fiber particles are mixedly arranged in ultrahigh molecular weight polyethylene and a site where silica or carbon fiber particles are separately arranged in ultrahigh molecular weight polyethylene are formed in a double manner along the boundary .
It should be understood, however, that the terminology or words of the present specification and claims should not be construed in an ordinary sense or in a dictionary, and that the inventors shall not be limited to the concept of a term It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.
As described in the above-mentioned constitution and operation, the present invention is based on the fact that particles impregnated by linearly dispersing silica and carbon fiber particles contained in ultrahigh molecular weight polyethylene, which are main materials of sealing, are uniformly and densely arranged, The doubling of the original role provides the effect of increasing overall life, as well as improving abrasion resistance, compressive strength and adhesion.
1 is a flow chart briefly illustrating a manufacturing process according to the present invention;
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The present invention relates to a method of producing a high pressure pump seal and a seal produced therefrom, and the seal is subjected to a mixing step (A), an addition step (B), a melting step (C) and a completion step (D) It completes. When the sealing of the present invention is compared with a concrete block, the main material, ultrahigh molecular weight polyethylene (UHMW-PE) corresponds to cement, silica (silica) as an additive, and carbon fiber as a reinforcing bar. That is, the main object of the present invention is to uniformly disperse and arrange gravel and reinforcing bars mixed with cement, gravel, and reinforcing bars together with proper mixing ratio. Hereinafter, an experimental example supporting this will be explained based on examples.
- Step (A)
First, 1.0 to 5.0% by weight of silica is mixed with 90 to 98% by weight of ultrahigh molecular weight polyethylene together with ethanol. That is, 1 to 3 g of silica is mixed with 100 g of ultra-high molecular weight polyethylene having a molecular weight of 5,000,000 or more, together with ethanol. The amount of ethanol to be mixed is not particularly important, but is preferably 5 to 10 times or more of the mixing volume of the ultrahigh molecular weight polyethylene and silica. Subsequently, the mixture is stirred at 1500 to 2500 rpm for 3 to 10 minutes to uniformly mix.
The mixed silica is prepared by mixing 0.1 to 5.0 wt% of spherical silica powder in an amount of 95 to 99.9 wt% of ethanol, dispersing the particles by applying ultrasonic waves for 60 to 120 seconds, . In other words, when silica powder is enlarged as shown in Table 1 below, spherical particles of 10 to 50 μm are clustered together and dispersed first.
Since silica is a hydrophilic material, it is dispersed well in water but not in oil components such as nucleic acids. The dispersed silica should be dispersed again in ethanol in the state of mixing with ultrahigh molecular weight polyethylene, and thus ethanol should be used. Furthermore, ethanol is an organic solvent harmless to the human body and can disperse carbon fibers described later.
On the other hand, as shown in Table 2 below, there is a clear difference between the ultrasonic wave treated examples and the untreated comparative examples.
In other words, it was observed that the ultrasonic waves applied to the silica particles were all dispersed and dispersed. However, when the ultrasonic waves were not applied, the silica particles were partially dispersed without being dispersed. Therefore, in order to uniformly disperse and arrange the silica particles on the ultrahigh molecular weight polyethylene, it is preferable to disperse by applying ultrasonic waves.
- Step (B)
The mixture of ultra high molecular weight polyethylene, silica and ethanol is heated to 80 to 90 占 폚 to evaporate ethanol. Then, 1.0 to 5.0% by weight of carbon fiber is added to the mixture. That is, 1 to 3 g of carbon fiber is added to a mixture in which silica particles are evenly dispersed and arranged on ultra high molecular weight polyethylene. Then, the mixture is stirred at 1500 to 2500 rpm for 3 to 10 minutes to homogeneously mix.
At this time, the carbon fiber to be added is cut into a length of 0.5 to 3.0 mm of a raw or plate-like raw material (carbon fiber), then immersed in ethanol of a volume ratio of 1: 200, and then ultrasonic waves are applied for 5 to 40 seconds to disperse the particles Filtered in the back and dried naturally. The diameter of the carbon fiber is 5 ~ 10㎛, and the raw material is a bundle of thousands of strands that are rolled up like a thread, or they come out as cloth. If these carbon fibers are used as they are, they can not be evenly dispersed and arranged on ultra-high molecular weight polyethylene. Therefore, it is preferable to disperse all the strands after cutting as shown in Table 3 below.
The carbon fiber is hydrophobic and does not disperse on the surface when dispersed in water, but it is easily mixed with ethanol and dispersed well.
On the other hand, as shown in Table 4 below, there is a clear difference between the ultrasonic wave treated examples and the untreated comparative examples.
In other words, it was observed that the ultrasonic wave was applied to all the carbon fiber particles (strands) dispersed and dispersed. However, when the ultrasonic wave was not applied, the carbon fiber particles were partially dispersed without being dispersed. Therefore, in order to uniformly disperse and arrange the carbon fiber particles on the ultrahigh molecular weight polyethylene, it is preferable to apply ultrasonic waves to disperse the carbon fiber particles.
- Step (C)
An additive in which silica and carbon fibers are mixed with ultrahigh molecular weight polyethylene is sealed in a mold. Subsequently, the mold is immersed in oil heated at 150 to 200 ° C for 30 to 120 minutes to melt the additive in the hot water. That is, when the additive completely sealed in a mold is soaked in oil heated at 180 ° C for 60 minutes, it is melted in a gel state.
- Step (D)
The molten material gelled with the hot water is extruded by a round bar under a pressure of 800 to 1200 kg / f. Then, the semi-finished product (round bar) cooled to room temperature is processed into a size and shape suitable for the pump to complete the sealing. That is, the melted material gelled with the hot water is passed through a die having a predetermined diameter at a pressure of 1,000 kg / f and then melted at 180 ° C to produce a semi-finished product of a round bar. It is preferable to incorporate a screw for mixing the melt inside the die so that the bubbles contained in the melt are removed at the time of extrusion. The manufactured semi-finished product is cut to a predetermined length and then cut into a suitable size and shape of the pump by a shelf as shown in Table 5.
The finished sealings were prepared by mixing 10-50 탆 spherical silica particles on ultra-high molecular weight polyethylene as shown in Table 6 below and 10-50 탆 spherical silica particles improving adhesion and 10- .
In the meantime, the sealing of the present invention is characterized in that a portion where silica and carbon fiber particles are mixedly dispersed in ultrahigh molecular weight polyethylene and a portion where ultrafine molecular weight polyethylene silica or carbon fiber particles are individually dispersed are formed in a double manner It is possible. For example, a melt mixed with ultrahigh molecular weight polyethylene and silica may be injected into a specific region in the process of extruding a melt mixed with ultrahigh molecular weight polyethylene, silica and carbon fibers.
That is, it is preferable that silica and carbon fiber particles are compositely formed in the ultrahigh molecular weight polyethylene and frictional is generated in the site where the frictional is generated in the sealing, and only the silica particles are formed in the ultrahigh molecular weight polyethylene. Such sealing can have a composite property capable of coping with various pump environments.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.
Claims (6)
(A) mixing 90 to 98% by weight of ultrahigh molecular weight polyethylene (UHMW-PE) with 1.0 to 5.0% by weight of silica with ethanol;
(B) heating the mixture to 80 to 90 占 폚 to evaporate ethanol, and adding 1.0 to 5.0% by weight of carbon fiber to the mixture;
(C) sealing the additive in a mold and immersing the mold in oil heated at 150 to 200 DEG C for 30 to 120 minutes to melt the additive in a hot bath; And
(D) extruding the melt at a pressure of 800 to 1200 kg / f, and processing the semi-finished product having the extrudate cooled to room temperature to a size and shape suitable for the pump to complete the sealing. A method for manufacturing a pump seal.
The silica is prepared by mixing 0.1 to 5.0% by weight of a spherical silica powder in 95 to 99.9% by weight of ethanol, dispersing the particles by applying ultrasonic waves for 60 to 120 seconds, Wherein the high-purity pump is a high-pressure pump.
The carbon fiber is cut into a length of 0.5 to 3.0 mm and then immersed in ethanol in a volume ratio of 1: 200. Then, ultrasonic waves are applied for 5 to 40 seconds to disperse the particles Followed by filtration and natural drying.
Wherein the step (A) and the step (B) are further carried out by stirring the mixture at 1500 to 2500 rpm for 3 to 10 minutes, followed by uniform mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150127022A KR101664089B1 (en) | 2015-09-08 | 2015-09-08 | Method of manufacturing a sealing for high-pressure pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150127022A KR101664089B1 (en) | 2015-09-08 | 2015-09-08 | Method of manufacturing a sealing for high-pressure pump |
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| Publication Number | Publication Date |
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| KR101664089B1 true KR101664089B1 (en) | 2016-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020150127022A KR101664089B1 (en) | 2015-09-08 | 2015-09-08 | Method of manufacturing a sealing for high-pressure pump |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050039797A (en) | 2005-03-31 | 2005-04-29 | 주식회사 에이.텍한독 | Airless pump's packing |
| KR200391421Y1 (en) | 2005-04-06 | 2005-08-04 | 주식회사 에이.텍한독 | pressure pump's packing |
| KR20060019550A (en) * | 2003-06-10 | 2006-03-03 | 엔티엔 가부시키가이샤 | Sliding bearing |
| KR20080005905A (en) | 2000-06-14 | 2008-01-15 | 미츠비시 덴센 고교 가부시키가이샤 | A seal material, a resin ring produed by the material and a seal produced by the ring |
| JP2014035013A (en) * | 2012-08-08 | 2014-02-24 | Ntn Corp | Plain bearing |
| KR101419956B1 (en) * | 2008-06-13 | 2014-07-16 | 후지쿠라 고무 코교 가부시끼가이샤 | Rubber composition and method for producing the same, seal member by using the same and apparatus having the same, and a rubber composition for resistance to dme |
-
2015
- 2015-09-08 KR KR1020150127022A patent/KR101664089B1/en active IP Right Grant
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080005905A (en) | 2000-06-14 | 2008-01-15 | 미츠비시 덴센 고교 가부시키가이샤 | A seal material, a resin ring produed by the material and a seal produced by the ring |
| KR20060019550A (en) * | 2003-06-10 | 2006-03-03 | 엔티엔 가부시키가이샤 | Sliding bearing |
| KR20050039797A (en) | 2005-03-31 | 2005-04-29 | 주식회사 에이.텍한독 | Airless pump's packing |
| KR200391421Y1 (en) | 2005-04-06 | 2005-08-04 | 주식회사 에이.텍한독 | pressure pump's packing |
| KR101419956B1 (en) * | 2008-06-13 | 2014-07-16 | 후지쿠라 고무 코교 가부시끼가이샤 | Rubber composition and method for producing the same, seal member by using the same and apparatus having the same, and a rubber composition for resistance to dme |
| JP2014035013A (en) * | 2012-08-08 | 2014-02-24 | Ntn Corp | Plain bearing |
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