JP2009236252A - Seal structure by liquid packing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal structure by a liquid packing, preventing water leakage even when the liquid packing is deformed by receiving internal pressure. <P>SOLUTION: The liquid packing 24 is interposed between mutually opposed contact surfaces 22a, 23a of a member to be joined. The contact surfaces 22a, 23a are formed with grooves 26, 27 in a predetermined area with the contact surfaces 22a, 23a mutually overlapped in order to surround the inner area of the member to be joined. The liquid packing 24 is filled between the contact surfaces 22a, 23a, and into the grooves 26, 27. The liquid packing 24 functions as an elastic body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seal structure using a liquid packing, and particularly relates to a seal structure in a pump casing.

  Conventionally, as this type of technology, for example, there is one shown in FIG. As shown in FIG. 3A, the liquid packing 2 applied between the flange joint surfaces 1a facing each other in the pump casing 1 is cured and the flange joint surfaces 1a are bonded and sealed together.

  Since there are various known liquid packings, description thereof is omitted. The liquid packing 2 withstands a shearing force acting due to a difference in internal and external pressures by applying thinly. Moreover, the adhesive force of the liquid packing 2 with respect to the flange joint surface 1a may be increased by interposing a thread or string between the flange joint surfaces 1a.

  Another prior art is disclosed in Patent Document 1. This is because when O-ring seals the joint end face of the case, the followability is poor and the sealing performance is lowered. A groove is formed on the joint end face of the case, and a liquid gasket is formed in the groove. It is filled and cured with time.

Moreover, what is described in Patent Document 2 is to prevent the liquid packing from protruding inside the casing. The liquid packing is interposed between the side wall joint surface of the water jacket portion and the joint surface of the pump housing. Both are joined, and a filling groove having a rectangular cross section for storing the liquid packing agent is formed on the joining surface of the pump housing.
JP 2002-213616 A Japanese Utility Model Publication No. 7-42405

  However, in the above-described configuration, the interface between the liquid packing 2 and the flange joint surface 1a forms a flat surface along the flange joint surface 1a. In Patent Documents 1 and 2, since a groove is not provided on one joint surface even when a groove is formed on the joint surface, the interface between the liquid packing and the joint surface forms a flat surface along the joint surface. .

  In this structure, as shown in FIG. 3B, when the internal pressure increases, the internal / external pressure difference increases, and when the liquid packing 2 is pushed outward by the internal pressure, the liquid packing 2 is deformed and the flange joint surface 1a. And the gap 3 is generated at the interface between the liquid packing 2 and the flange joint surface 1a, causing water leakage.

  The present invention solves the above-described problems, and an object of the present invention is to provide a seal structure using a liquid packing that can prevent water leakage even when the liquid packing is deformed due to internal pressure.

  In order to solve the above-described problems, the sealing structure using the liquid packing according to the present invention is configured such that the liquid packing is interposed between the opposing bonding surfaces of the members to be bonded, and the inner surfaces of the members to be bonded at the respective bonding surfaces. A groove formed so as to surround the region is provided in a predetermined region where both joint surfaces overlap each other, and a liquid packing is filled between both the joint surfaces and in the groove, and the liquid packing forms an elastic body.

  Further, in the sealing structure using the liquid packing according to the present invention, the grooves on both joint surfaces have a shape in which the inner wall surface on the low pressure side is substantially perpendicular to the joint surface and serves as the pressure receiving surface and the seal surface. The liquid packing filled in the groove forms an integral wall that separates the high-pressure side and the low-pressure side and penetrates both joint surfaces.

  Further, in the sealing structure using the liquid packing according to the present invention, the grooves on both the joining surfaces have a shape in which the inner wall surface on the low pressure side is inclined toward the high pressure side.

  As described above, according to the present invention, the liquid packing forms a thin seal layer between the joining surfaces, the seal layer forms a wall body in the groove, and the seal layer wall body has a high pressure side and a low pressure side. Separate.

  For this reason, when the pressure on the high pressure side is received, the liquid packing is deformed, the liquid packing is deformed and peels off from the flange joint surface, and a gap is formed at the interface between the liquid packing and the flange joint surface. Acts on the wall of the seal layer and presses the wall of the seal layer against the inner wall surface on the low pressure side of the groove. Therefore, a self-sealing function for applying a high pressure in the inner region of the joining target member is realized in the liquid packing.

  At this time, the liquid packing filled in both grooves forms an integral wall that separates the high-pressure side and the low-pressure side and penetrates both joint surfaces, thereby reliably preventing water leakage. Further, the inner wall surface on the low pressure side of the groove is substantially perpendicular to the joint surface and serves as a pressure receiving surface and a sealing surface, so that the inner wall of the seal layer of the liquid packing and the inner surface of the groove on the low pressure side are formed. The pressure contact force with the wall surface is increased and the sealing performance is improved.

  In addition, the groove on both joint surfaces has a shape in which the inner wall surface on the low-pressure side is inclined toward the high-pressure side, so that the area of the wall surface on the low-pressure side that becomes the sealing surface without deepening the groove that is troublesome for processing. Can be increased to improve the sealing performance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown to Fig.1 (a), the pump casing 21 as a joining object member has the flanges 22 and 23 in a division | segmentation surface, and the surfaces which the flanges 22 and 23 oppose make the joining surfaces 22a and 23a. The flanges 22 and 23 have a liquid packing 24 interposed between the joint surfaces 22a and 23a, and are fastened by bolts and nuts 25. The liquid packing 24 is a conventionally known general one, and although detailed explanation is omitted, it is cured and elastic after being applied to the joining surfaces 22a and 23a.

  Grooves 26 and 27 are formed in predetermined areas where the joint surfaces of the flanges 22 and 23 overlap with each other, and the grooves 26 and 27 are formed on the joint surfaces 22a and 23a of the pump casing 21. It is formed surrounding the inner region.

  The cross-sectional shape of both grooves 26 and 27 is a rectangular shape, and the inner wall surfaces 26a and 27a on the low-pressure side are substantially perpendicular to the joint surfaces 22a and 23a and serve as a pressure receiving surface and a sealing surface. Eggplant. By forming a rectangular shape, processing is easy, and a shape that serves as both a pressure receiving surface and a sealing surface can be best realized.

  The liquid packing 24 is cured between the joint surfaces 22a and 23a and after filling the grooves 26 and 27 to form an elastic body, and the liquid packing 24 filled in both the grooves 26 and 27 is placed on the high pressure side (inside the pump casing). ) And the low-pressure side (outside of the pump casing), and an integral wall body 28 penetrating both joint surfaces 22a and 23a is formed.

  As described above, according to the present invention, the liquid packing 24 forms a thin seal layer between the joint surfaces 22a and 23a, and the seal layer forms the wall body 28 in the grooves 26 and 27. A wall 28 separates the high pressure side and the low pressure side.

  For this reason, as shown in FIG. 1 (b), the liquid packing 24 is deformed by receiving the pressure inside the pump casing 21 on the high pressure side, and the liquid packing 24 is deformed to join the joining surfaces 22a of the flanges 22 and 23. 23a, and a gap 29 is formed at the interface between the liquid packing 24 and the joint surfaces 22a and 23a, the high-pressure side pressure acts on the wall 28 of the seal layer through the gap 29, and the wall 28 of the seal layer. Are pressed against the inner wall surfaces 26a, 27a on the low pressure side of the grooves 26, 27. Therefore, a self-sealing function in which the pressure inside the pump casing 21 is the working pressure is realized in the liquid packing 24.

  At this time, the liquid packing 24 forms an integral wall body 28 in both the grooves 26 and 27 and penetrates both the joint surfaces 22a and 23a, thereby reliably preventing water leakage. The inner wall surfaces 26a, 27a on the low pressure side of the grooves 26, 27 are substantially perpendicular to the joint surfaces 22a, 23a and serve as a pressure receiving surface and a sealing surface, so that the wall of the sealing layer of the liquid packing 24 The pressure contact force between the body 28 and the inner wall surfaces 26a, 27a on the low pressure side of the grooves 26, 27 is increased, and the sealing performance is improved.

  As shown in FIG. 2, the sectional shape of both grooves 26 and 27 may be a triangle, a circle, or a rhombus. The sealing area can be improved by increasing the area of the wall surface on the low-pressure side that becomes the sealing surface.

The schematic diagram which shows the seal structure by the liquid packing in embodiment of this invention The schematic diagram which shows the groove structure in other embodiment of this invention Schematic diagram showing the seal structure with conventional liquid packing

Explanation of symbols

21 Pump casing 22, 23 Flange 22a, 23a Joint surface 24 Liquid packing 25 Bolt / Nut 26, 27 Groove 26a, 27a Inner wall 28 Wall 29 Clearance

Claims (3)

  A liquid packing is interposed between the opposing joining surfaces of the joining target members, and a groove is formed in each joining surface so as to surround the inner region of the joining target member in a predetermined region where both joining surfaces overlap. A sealing structure using a liquid packing, characterized in that a liquid packing is filled between both joint surfaces and in a groove, and the liquid packing forms an elastic body.   The grooves on both joint surfaces have a shape in which the inner wall surface on the low pressure side is substantially perpendicular to the joint surface and serves as a pressure receiving surface and a sealing surface, and the liquid packing filled in both grooves is on the high pressure side and the low pressure side. The seal structure by the liquid packing of Claim 1 which makes | forms the integral wall body which penetrates both the joint surfaces.   2. The sealing structure using a liquid packing according to claim 1, wherein the grooves on both the joining surfaces have a shape in which the inner wall surface on the low pressure side is inclined toward the high pressure side.

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