JP4632282B2 - High pressure fluid sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-pressure fluid sealing device suitable for sealing a high-pressure fluid in a device such as a pump.
[0002]
[Prior art]
Generally, as a device for sealing a high-pressure fluid, a packing box made of an adapter ring, a packing ring, an elastic ring, a backup ring, etc. has been widely used, and the applicant of the present application is an example of such a device. A high-pressure fluid sealing device having high sealing performance and a long life has already been proposed (Japanese Patent Publication No. 7-35858).
[0003]
FIG. 5 is a sectional view of an example of the conventional apparatus. As shown in FIG. 5, the conventional apparatus includes a top adapter ring 4, an elastic ring 5, a packing ring 6, a backup ring 7, and a bottom adapter ring 8 b in the packing box 3 from the high pressure portion toward the low pressure portion. The conventional device seals the fluid from leaking from the high pressure side to the low pressure side while the inner member 2 repeatedly moves in the relative movement direction (see FIG. 1).
[0004]
In the case of a device composed of the same or equivalent ring as in FIG. 5, when part of the packing ring 6 and the backup ring 7 is worn and deformed, as shown in FIG. A gap A occurs between the two. When this gap A occurs, the relative movement direction of the inner member 2 generates not only the axial direction component but also the vertical direction component of the axial line. For this reason, a phenomenon (galling) occurs that bites the bottom adapter ring 8b.
[0005]
In order to prevent this galling, the inner surface of the bottom adapter ring 8b has been conventionally surface-treated.
[0006]
Furthermore, liquid lubrication was performed on the sliding contact surface between the inner member 2 and the bottom adapter ring 8b.
[0007]
[Problems to be solved by the invention]
However, if the packing ring 6 is greatly worn and deformed, and there is a problem with the uniformity of liquid lubrication on the sliding contact surface (that is, when lubrication failure occurs), galling occurs and the seal Sex is reduced. If galling occurs, not only will the bottom adapter ring 8b and the inner member 2 be damaged, but the wear and deformation of the packing ring 6 will be further promoted. Therefore, it was necessary to frequently replace the packing ring 6, the bottom adapter ring 8b, and the inner member 2, and the life was short.
[0008]
In particular, when the inner member 2 is relatively moved at high speed, the above-described wear and deformation are also remarkable, and the packing ring 6, the bottom adapter ring 8b, and the inner member 2 are frequently replaced, and the life is extremely short.
[0009]
Further, in the prior art, since a liquid lubrication means from the outside is necessary on the sliding contact surface between the inner member 2 and the bottom adapter ring 8b, it cannot be used in an environment where liquidless lubrication is required. It was.
[0010]
As described above, an object of the present invention is to provide a high-pressure fluid sealing device that has a long life and is capable of liquid-free lubrication.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, the annular gap formed between the two members composed of the outer member and the inner member that move relative to each other is sealed to separate the high pressure portion and the low pressure portion. A high-pressure fluid sealing device provided in
An elastic ring inserted in a direction facing the relative movement direction between the high-pressure part and the low-pressure part in a gap between the inner periphery of the outer member and the outer periphery of the inner member;
A packing ring for supporting the elastic ring on the low-pressure part side;
A backup ring that supports the packing ring on the low-pressure part side and has a higher yield strength than the packing ring;
The backup ring is supported on the low-pressure part side, and a bottom adapter ring arranged in a direction facing the relative movement direction;
In a high pressure fluid sealing device comprising at least
Some of the bottom adapter ring and the annular gap formed between the two members consisting of an inner member, the bearing sleeve wear-resistant resin material having self-lubricating property, the bottom adapter ring on the high pressure side one A metal part is provided and is inserted in a state of sliding contact with the inner member, and a predetermined gap is provided between the metal part and the inner member .
[0012]
As shown in FIG. 1, a bearing sleeve 9 made of a wear-resistant resin material having self-lubricating property is slidably connected to the inner member 2 in an annular gap formed between two members including the bottom adapter ring 8 and the inner member 2. Inserted in contact. Therefore, according to the present invention, due to the self-lubricating property of the material itself of the bearing sleeve 9, liquid lubrication means from the outside is not necessary for the sliding contact surface between the bearing sleeve 9 and the inner member 2. For this reason, unexpected lubrication failure caused by liquid lubrication means from the outside is eliminated, the sliding contact surface is always in a stable lubrication state, and galling as in the prior art can be prevented. Preventing galling leads to the effect of suppressing the promotion of abnormal wear of the bottom adapter ring 8, the packing ring 6 and the inner member 2, so that the sealing performance of the packing ring 6 is stable and the life can be extended. It becomes.
[0013]
According to a second aspect of the present invention, in the high pressure fluid sealing device according to the first aspect, a stopper ring for supporting the bottom adapter ring and the bearing sleeve on the low pressure part side is provided. .
[0014]
Since the pressure of the fluid to be sealed acts from the high-pressure part side toward the low-pressure part side, the bearing sleeve 9 may be pushed by the pressure in the configuration shown in FIG. If the bearing sleeve 9 is displaced toward the low-pressure portion side, it may adversely affect the lubrication state of the sliding contact surface with the inner member 2, which may cause galling and accelerate wear of the packing ring 6 and the inner member 2. . Therefore, in the present invention, as shown in FIG. 2, the bearing sleeve 9 is shifted to the low pressure portion side by providing the stopper ring 10 for supporting the bottom adapter ring 8 and the bearing sleeve 9 on the low pressure portion side. And can be held stably in the bottom adapter ring 8. Thereby, since the lubrication state of the said sliding contact surface is stabilized, lifetime extension becomes possible.
[0015]
According to a third aspect of the present invention, in the high-pressure fluid sealing device according to the first or second aspect, the inner diameter of the bearing sleeve is the same as or smaller than the inner diameter of the bottom adapter ring. .
[0016]
When the inner diameter of the bearing sleeve 9 is larger than the inner diameter of the bottom adapter ring 8, the bearing sleeve 9 and the inner member 2 are not in sliding contact with each other, and the self-lubricating property of the bearing sleeve 9 cannot be used. Therefore, the inner diameter of the bearing sleeve 9 needs to be at least the same as or smaller than the inner diameter of the bottom adapter ring.
[0017]
More preferably, the bearing sleeve 9 may have a longer life when the inner diameter of the bearing sleeve 9 is smaller than the inner diameter of the bottom adapter ring 8 by about 0.02 mm.
[0018]
According to a fourth aspect of the present invention, in the high-pressure fluid sealing device according to the second or third aspect, the bottom adapter ring and the stopper ring have an integral structure.
[0019]
According to the present invention, as shown in FIG. 3, since the bottom adapter ring 8a is integrated with a member corresponding to the stopper ring 10 of FIG. 2, the stopper ring 10 is detached or loosened. And the lubrication state of the sliding contact surface between the bearing sleeve 9 and the inner member 2 is stabilized.
[0020]
Further, since the structure of the parts is simplified, maintenance can be easily performed. Furthermore, if the bottom adapter ring 8a is manufactured so that the thickness B and the thickness C shown in FIG. 3 are the same, the insertion direction of the bottom adapter ring 8a will not be mistaken. It is possible to improve the efficiency of the assembly work of the stopper.
[0021]
According to the fifth aspect of the present invention, the annular gap formed between the two members composed of the outer member and the inner member that move relative to each other is sealed to separate the high pressure portion and the low pressure portion. A high-pressure fluid sealing device provided in
An elastic ring inserted in a direction facing the relative movement direction between the high-pressure part and the low-pressure part in a gap between the inner periphery of the outer member and the outer periphery of the inner member;
A packing ring for supporting the elastic ring on the low-pressure part side;
A backup ring that supports the packing ring on the low-pressure part side and has a higher yield strength than the packing ring;
The backup ring is supported on the low-pressure part side, and a bottom adapter ring arranged in a direction facing the relative movement direction;
In a high pressure fluid sealing device comprising at least
Wherein a portion of said inner member and sliding contact surface with the inner surface of the bottom adapter ring, wear-resistant resin material having self-lubricating property is provided some metal part on its high pressure side is lined, the metal portion And a predetermined gap between the inner member and the inner member .
[0022]
That is, as shown in FIG. 4 instead of the bearing sleeve, a part of the inner surface of the bottom adapter ring 8c is subjected to a lining treatment 11 with a wear-resistant resin having self-lubricating properties. Thereby, liquid-free lubrication is possible with a long life without inserting a bearing sleeve. Of course, since the component configuration can be simplified, the work efficiency during assembly is also improved. Here, as shown in FIG. 4, it is necessary to provide an unlined portion (metal portion) on the high pressure portion side of the bottom adapter ring 8c, and it is desirable that the metal portion has a slight gap E. . This is because if the metal part does not exist and the entire inner peripheral surface of the bottom adapter ring 8c is subjected to a lining process, the backup ring 7 causes the lining process 11 to pass the lining process 11 by the pressure of the fluid from the high pressure part side. This is because there is a possibility of being pushed out.
[0023]
The thickness of the lining treatment 11 is preferably about 0.1 to 3 mm.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the part which attached | subjected the same code | symbol represents the part which is the same or corresponds.
[0025]
FIG. 1 shows a first example of the embodiment of the present invention. In order to seal the annular gap formed between two members consisting of the outer member 1 (for example, a cylinder) and the inner member 2 (for example, a plunger or a piston), and to partition the high pressure portion and the low pressure portion, the annular gap A packing box 3 is inserted into the. The packing box 3 includes a top adapter ring 4 disposed in a direction facing the relative movement direction of the inner member 2, an elastic ring 5 in contact with the low pressure portion side of the top adapter ring 4, and the elastic ring 5 as a low pressure portion. A packing ring 6 that is supported on the side, a backup ring 7 that supports the packing ring 6 on the low pressure side, and a backup ring 7 that has a higher yield strength than the packing ring 6, and a backup ring 7 that is supported on the low pressure side. A self-lubricating wear-resistant resin material is formed in an annular gap formed between the bottom adapter ring 8 arranged in a direction facing the moving direction and the bottom adapter ring 8 and the inner member 2. It comprises a bearing sleeve 9. The inner diameter of the bearing sleeve 9 is made smaller than the inner diameter of the bottom adapter ring 8.
[0026]
The packing ring 6 is in sliding contact with the inner member 2 being pressed by the elastic force of the elastic ring 5, and seals leakage of fluid from the high-pressure part side to the low-pressure part side. Accordingly, when part of the packing ring 6 and the backup ring 7 is worn and deformed with the passage of time, a gap (for example, the gap A in FIG. 6) is formed in a part between the inner member 2 and the inner ring. When such a gap is generated, not only the axial direction component but also the vertical direction component of the axial line is generated in the relative movement direction of the inner member 2. As a result, the inner member 2 moves not only relative to the axial direction but also in the direction perpendicular to the axial line. If the bottom adapter ring is of the prior art (8b in FIG. 6), the bottom adapter ring Will bite.
[0027]
However, in the present invention, since the bearing sleeve 9 made of a wear-resistant resin material having self-lubricating property is inserted as shown in FIG. 1, the self-lubricating property is maintained even when the inner member moves in the direction perpendicular to the axis. Therefore, the galling can be prevented, and the life of the packing ring 6 and the inner member 2 can be extended.
[0028]
Further, since the bearing sleeve 9 has self-lubricating properties, it is not necessary to liquid lubricate the sliding contact surface with the inner member 2 from the outside, and the bearing sleeve 9 should be used even in an environment where liquidless lubrication is required. Can do.
[0029]
FIG. 2 shows a second example of the embodiment of the present invention. Here, the description of the part having the same configuration as in FIG. 1 is omitted. In the second embodiment, since the stopper ring 10 for supporting the bottom adapter ring 8 and the bearing sleeve 9 on the low pressure part side is inserted, the bearing sleeve 9 is shifted to the low pressure part side due to the fluid pressure from the high pressure part side. Can be prevented. As a result, the lubrication state of the sliding contact surface between the bearing sleeve 9 and the inner member 2 is always stable, so that galling can be prevented and a longer life can be achieved.
[0030]
It is more preferable that the thickness C of the stopper ring 10 and the thickness B of the bottom adapter ring 8 shown in FIG. 2 are the same or equivalent.
[0031]
Preferably, the thicknesses B and C are about 1 to 5 mm.
[0032]
On the other hand, it is preferable that the clearance D between the high pressure part side metal part of the bottom adapter ring and the stopper ring 10 and the inner member 2 is in a range of about 0.01 to 0.1 mm.
[0033]
FIG. 3 shows a third example of the embodiment of the present invention. Here, the description of the part having the same configuration as in FIGS. 1 and 2 is omitted. In the third embodiment, the bottom adapter ring 8 a has an integral structure having the function of the stopper ring 10.
[0034]
The thickness B and the thickness C of the bottom adapter ring 8a shown in FIG. 3 are manufactured with the same dimensions, and are devised so as not to cause an error in the insertion direction of the bottom adapter ring 8a during the assembly operation. .
[0035]
FIG. 4 shows a fourth example of the embodiment of the present invention. Here, the description of the part having the same configuration as in FIGS. 1, 2 and 3 is omitted. In the fourth embodiment, instead of inserting the bearing sleeve into the bottom adapter ring 8c, a part of the inner surface of the bottom adapter ring 8c (with a metal part on the high-pressure part side) has self-lubrication resistance. Wear resin material is lined. This lining process 11 not only can provide the same function as the bearing sleeve, but can also reduce the number of parts, thereby contributing to improvement in assembly work efficiency.
[0036]
The thickness of the lining treatment 11 is preferably in the range of about 0.1 to 3 mm.
[0037]
Thus, it is possible to provide a high-pressure fluid sealing device that has a long life and can be liquid-free lubricated. In addition, since a synergistic effect of increasing the sealing performance can be obtained if a material having a high sealing performance is used for the bearing sleeve or the lining treatment, it is preferable to select a material for the bearing sleeve or the lining treatment according to the purpose.
[0038]
Although the Example in which the top adapter ring 4 is arrange | positioned was shown in FIGS. 1-4, it is good also as a structure which substitutes the outer side member 1 as a top adapter ring, and does not arrange | position this top adapter ring. In this case, it is desirable to make the corner R portion of the packing box 3 as small as possible.
[0039]
The high-pressure fluid sealing device of the present invention is not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.
[0040]
【The invention's effect】
As described above, according to the high-pressure fluid sealing device according to claims 1 to 5 of the present invention, it is possible to prevent galling, have a long life, and achieve an excellent effect that liquid-free lubrication is possible. As a result of the present invention, it has been confirmed in the performance test that the packing life has increased by about five times from about 200 hours to about 900 hours compared to the conventional product.
[0041]
In addition, since the maintenance cycle becomes longer, it is possible to achieve excellent effects such as cost reduction and improvement of the reliability of the entire apparatus.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a high-pressure fluid sealing apparatus showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a high-pressure fluid sealing device showing a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of a high-pressure fluid sealing device showing a third embodiment of the present invention.
FIG. 4 is a cross-sectional view of a high-pressure fluid sealing device showing a fourth embodiment of the present invention.
FIG. 5 is a cross-sectional view for explaining a conventional high-pressure fluid sealing device.
FIG. 6 is a cross-sectional view of a high-pressure fluid sealing device for explaining that an inner member is gnawed.
[Explanation of symbols]
1: Outer member 2: Inner member 3: Packing box 4: Top adapter ring 5: Elastic ring 6: Packing ring 7: Backup ring 8, 8a, 8b, 8c: Bottom adapter ring 9: Bearing sleeve 10: Stopper ring 11: Lining process

Claims (5)

A high-pressure fluid sealing device provided in the annular gap for sealing an annular gap formed between two members consisting of an outer member and an inner member that move relative to each other to partition a high-pressure part and a low-pressure part. ,
An elastic ring inserted in a direction facing the relative movement direction between the high-pressure part and the low-pressure part in a gap between the inner periphery of the outer member and the outer periphery of the inner member;
A packing ring for supporting the elastic ring on the low-pressure part side;
A backup ring that supports the packing ring on the low-pressure part side and has a higher yield strength than the packing ring;
A bottom adapter ring that supports the backup ring on the low-pressure part side and is arranged in a direction facing the relative movement direction;
In a high pressure fluid sealing device comprising at least
A bearing sleeve made of a wear-resistant resin material having self-lubricating property is formed in a part of an annular gap formed between the two members including the bottom adapter ring and the inner member, and a bottom adapter ring is provided on the high-pressure part side. A high-pressure fluid sealing device , wherein a metal part is provided and inserted in a state of sliding contact with the inner member, and a predetermined gap is provided between the metal part and the inner member . The high-pressure fluid sealing device according to claim 1, further comprising a stopper ring that supports the bottom adapter ring and the bearing sleeve on the low-pressure part side. 3. The high-pressure fluid sealing device according to claim 1, wherein an inner diameter of the bearing sleeve is the same as or smaller than an inner diameter of the bottom adapter ring. The high-pressure fluid sealing device according to claim 2 or 3, wherein the bottom adapter ring and the stopper ring have an integral structure. A high-pressure fluid sealing device provided in the annular gap for sealing an annular gap formed between two members consisting of an outer member and an inner member that move relative to each other to partition a high-pressure part and a low-pressure part. ,
An elastic ring inserted in a direction facing the relative movement direction between the high-pressure part and the low-pressure part in a gap between the inner periphery of the outer member and the outer periphery of the inner member;
A packing ring for supporting the elastic ring on the low-pressure part side;
A backup ring that supports the packing ring on the low-pressure part side and has a higher yield strength than the packing ring;
A bottom adapter ring that supports the backup ring on the low-pressure part side and is arranged in a direction facing the relative movement direction;
In a high pressure fluid sealing device comprising at least
Wherein a portion of said inner member and sliding contact surface with the inner surface of the bottom adapter ring, wear-resistant resin material having self-lubricating property is provided some metal part on its high pressure side is lined, the metal portion A high-pressure fluid sealing device having a predetermined gap between the inner member and the inner member .

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