MXPA97006582A - Automat seal head assembly - Google Patents

Abstract

The present invention relates to an automatic seal device, including the seal device: a tubular spring seat, a spring in contact with the spring seat, a patch in contact with the spring seat and a housing and a fixed housing the patch including a bellows, including in patch a metallic lining molded into the patch, the metal lining being at a predetermined distance from a shore wall of the spring seat, the spring seat forming a loose fit with the metal lining; seal insulator assembly, including the seal seat assembly a circumferential seal seat, and a seal sheave inside the patch, this seal bearing having a seal face that is in constant contact with the seal seat, in loose fit Holds the concentric seal face with the fixed end the patch and resor seat

Description

AUTOMATIC SEAL HEAD ASSEMBLY Background of the Invention Field of the Invention The present invention relates to seals and sealing, and more particularly to an automatic seal head assembly for use on an arrow. Description of the Related Art Rotating mechanical face seal assemblies commonly used in automotive water pumps and similar relatively low hydraulic pressure sealing applications typically include a sealing patch of a deformable elastomeric material, a seal seat, a sheave sealing means, a spring for forcing the sealing wheel against the seal seat, and a configuration for retaining the components in a sealing relationship with respect to a stationary housing and a rotary arrow pressing through the housing bore. A portion of the axial sealing force results from the sealing patch deforming from its molded free state to a used deformed state. The force required for this deformation normally does not contribute in an active way to the seal, and if necessary, will eventually decrease to a negligible level due to the relaxation and deterioration of the elastomer. In addition, springs that are commonly used in these assemblies, usually have nominal spring forces that are significantly higher than the minimum force required to ensure an appropriate seal even after accommodating the normal axial tolerances of the combined components. Seal devices of the prior art are adversely affected by variations in seal face lubrication, eccentricity, and deviations, all of which result in a lateral force on the face of the seal. This lateral force causes a radial displacement and a moment that forces the seal sheave to lose contact with the face of the seal. Once this force is removed or released, the faces of the seal will close forcefully, which causes fluid leakage and unwanted noise. Accordingly, there is a need in the art for an automatic seal assembly that maintains a continuous seal face contact through all operating conditions. SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic seal device. Another object of the present invention is to provide a seal that maintains constant contact of the seal face with its sealing surface. It is a further object of the present invention to prevent radial displacement of the seal face, by transmitting any lateral load to the spring seat, and subsequently to the housing. To achieve the above objects, the automatic seal device includes a spring seat that includes a spring inside the spring seat, a patch that is made of an elastomer that is in contact with the spring seat, and a fixed housing. The patch includes a metallic lining molded with it. The automatic seal device further includes a seal seat assembly that includes a circumferential seal seat made of a ceramic material. The automatic seal device also includes a seal sheave that is in constant contact with the seal seat assembly. An advantage of the present invention is that the moderate interference or the adjustment tolerance of the tubular section of the spring seat creates a damping effect and a direct advantage. This effect reduces the magnitude of the torsional force and the radial displacement fluctuations caused by the changes in friction coefficients and / or interfacial contamination. Another advantage of the present invention is the prevention of radial displacement of the seal sheave. A further advantage of the present invention is the elimination of noise and leakage at the interfaces of the seal.

Other objects, features, and advantages of the present invention will become clearer from the following description and the appended claims taken in conjunction with the accompanying drawings. Brief Description of the Drawings Figure 1 shows a plan view of the present invention. Figure 2 shows an enlarged cross-sectional view of Figure 1 of the present invention. Figure 3 shows an enlarged cross-sectional view of the head of the seal. Figure 4 shows a seal device of the prior art. Figure 5 shows a sealing device of the prior art, applying a force Fs. Figure 6 shows the present invention of an automatic seal device, with a force Fs being applied. Best Way to »Perform the Invention and Description of the Preferred Modes Referring to the drawings and Figures 1 to 6, an automatic seal assembly 16 is shown inside a housing 10 surrounding an arrow 12 of a pump, such as a water pump, of an internal combustion engine. The automatic seal assembly 16 includes a seal head assembly 20 and a seal seat assembly 18. The automatic seal assembly 16 will prevent liquid from penetrating from one side of the hole 14 through the seal 16 around the arrow 12, and to the other side of the hole 14. The automatic seal assembly 16 prevents fluid from leaking from one end of the pump assembly to the lower portion of the pump assembly, by force applied with the spring 34 at the sealing interface 40. The seal head assembly 20 includes a patch 26 which is preferably made of an elastomer, but can be made of any other suitable type of flexible deformable material capable of withstanding the associated operating conditions of any number of operating environments. The elastomeric patch 26 has a circumferential shape, and forms the outer surface of the seal head assembly 20, which is secured inside the housing 10 by snap fit into a counter-bore of the housing 10. The outer surface portion of the elastomeric patch 26 it also includes an angled corner 42 that leaves an opening between the wall of the housing 10 and the elastomeric patch 26. The elastomeric patch 26 generally has a U-shaped cross section. The elastomeric patch 26 has an inner leg 44 and an outer leg 46. The elastomeric patch 26 also includes at least one bellows 48 disposed between the inner leg 44 and the outer leg 46. The bellows 48 of the elastomeric patch 26 has an S-shaped or wave-shaped cross section. The outer leg 46 has an inwardly radiating flange 50 on which the spring member 32 is positioned. The outer leg 46 also includes an indentation or channel 52 on its inner surface. The indentation 52 receives and secures the outwardly extending flange 38 of the spring seat member 32. The inner leg 44 of the elastomeric patch 26 includes an axial surface 54 on which abuts the radial seal sheave 30. The inner leg 44 of the elastomeric patch 26 includes a protrusion 36. The protrusion 36 remains on the external surface of the inner leg 44. The seal head assembly 20 also includes a metal liner 28 which is preferably made of a metal material, but is also You can make any ceramic material or other hard plastic. The metal liner 28 is molded directly into the inner wall of the elastomeric patch member 26, and has an S-shaped cross section. The metal liner 28 has an axial surface 58 that is parallel to the seal face 56 of the seal sheave 30. The metal liner 28 is in contact with the spring 34, which is used to create the force for the seal sheave 30. The seal head assembly 20 also includes a tubular spring seat 32. The spring seat 32 has a generally U-shaped cross section. The spring seat 32 includes an outwardly extending flange 38 on its outer circumference, which engages the indentation or channel 52 of the inner wall of the elastomeric patch 26. This allows a secure attachment of the spring seat 32 with the elastomeric patch 26, and a correct alignment of the seal head assembly 20 with the assembly of the seal seat 18. The seat of the spring 32 is also in contact with the housing 10. The seat of the spring 32 engages with the protrusion 36 on its inner surface. The coupling between the protrusion 36 and the spring seat 32 is snapped or secured by any other suitable element, and tends to dampen any vibrations that pass through the seal sheave 30, the metal liner 28, and the seat of the spring 32. The tolerance between the outer edge 60 of the metallic lining 28 and the inner wall 62 of the seat of the spring 32, is preferably from 25.4 to 152.4 microns, but may be within the range of 2.54 to 1.524 microns. This interference or tolerance of small or moderate adjustment of the spring seat 32 and the inner edge of the metal fitting 28, creates a cushioning effect and a guiding advantage for the overall seal member. This effect will reduce the magnitude of the torsional forces and the fluctuations of the radial displacement that are caused by changes in the coefficients of friction and / or interfacial contamination of the face of the seal 56. The seat of the spring 32 forms an interference or moderate adjustment tolerance with the metal liner 22 which is attached to the spring 34, which in turn then stops the seal face 56 concentric to the fixed end of the seal head assembly 20. The seal head assembly 20 also includes a radial seal sheave 30 that snaps or is secured by any other suitable element within the elastomeric patch 26. The seal sheave 30 has a seal seat face 56 that is in constant contact with a seal seat assembly 18. The seal sheave 30 can be made of a ceramic material or any other material of hardened plastic or fiule, depending on the operating conditions and n that the seal sheave 30 will be used. The seal sheave 30 is in constant contact with the seal seat assembly 18 through a spring 34, which provides a biased force. The automatic seal assembly 16 also includes a seal seat assembly 18 that includes a radial ceramic seal seat 24, which is configured in a circumferential manner, and secured within a circumferential elastomeric patch member 22. The member of patch 22 is snapped or secured by any other suitable element within a counter-hole, inside an opposite face of housing 10 from seal head assembly 20. Ceramic seal seat 24 inside of the The seal seat assembly 18 is in constant contact with the seal face 56 on the seal sheave 30 from the seal head assembly 20. It should be noted that the preferred seal seat 24 is made of a ceramic material, but other comparable materials can also be used. Figures 4 and 5 show a seal member of the prior art 16. Figure 5 shows the seal assembly 116, applying a lateral force Fs from below. This creates a moment 174 around the spring member 134, which forces the seal sheave 130 to disengage from the seal seat 118, creating a space for fluid leakage to occur around the arrow 112. The lateral force FB that causes this seal violation, may be caused by variations in the lubrication of the seal face, variations in eccentricity, deviations, and other forces found inside the housing unit 110. The radial displacement that is caused by this lateral force creates the moment around a fixed point in space, in such a way that the contact of the face of the seal is lost, and when the force is changed or the seal or lateral force is completely removed, this sudden change causes the face of the seal to close instantly, which causes leakage and noise inside the housing unit. Figure 6 shows the present invention when a lateral force Fs is transmitted to the seal sheave 30, causing a radial displacement and a moment around a fixed point in space. The lateral force Fa of the present invention is transmitted to the spring seat 32, which is fixed to the housing 10, and subsequently the force Ft that was transferred to the spring seat 32 is transferred to the housing 10 as FH. Consequently, the lateral force Fs will be equal to the force of the spring seat Ft, which will be equal to the force FH that is applied to the housing. This will prevent any radial displacement from occurring in the seal sheave 30, and will keep the face of the seal 56 in constant contact with the "seal seat 18" assembly. This will stop any opening or closing of the seal face, which It will eliminate any associated noise and leakage inside the housing unit The present invention has been described in an illustrative manner It should be understood that the terminology that has been used is intended to be in the nature of the words of the description, rather than is a limitation Many modifications and variations of the present invention are possible in light of the above teachings Therefore, within the scope of the claims, the present invention can be practiced in a manner different from that specifically described and claimed.

Claims (20)

1. NOVELTY OF THE INVENTION Having described the foregoing invention, it is considered as a novelty, and therefore, property is claimed as contained in the following: CLAIMS 1. An automatic seal device, including this seal device: a seat tubular spring; a spring in contact with the spring seat; a patch in contact with the spring seat and a fixed housing, the patch including a bellows, the bellows including a metal liner molded into the patch, the metal liner being at a predetermined distance from a shore wall of the spring seat; a seal seat assembly, including the seal seat assembly a circumferential seal seat; and a seal sheave inside the patch, this seal sheave having a seal face that is in constant contact with the seal seat.
2. 2. The automatic seal device according to claim 1, characterized in that the patch is made of an elastomer.
3. 3. The automatic seal device according to claim 1, characterized in that the seal seat is ceramic.
4. 4. The automatic seal device according to claim 1, characterized in that the stamp-sheave is made of ceramic.
5. 5. The automatic seal device according to claim 1, characterized in that the predetermined distance is between approximately 25.4 microns and 162.4 microns.
6. 6. The automatic seal device according to claim 1, characterized in that the patch is between the metal lining and the spring seat.
7. 7. The automatic seal device according to claim 6, characterized in that it also includes a protrusion on the patch
8. 8. The automatic seal device according to claim 7, characterized in that the protrusion is in contact with the spring seat
9. 9. An automatic seal device, including: a seal head assembly that is disposed within a housing member; a seal seat assembly that is disposed within an opposite wall of the housing; housing member, directly through the seal head assembly, the seal head assembly that is in constant contact with the seal seat assembly; the seal head assembly including a patch member having generally a U-shaped cross section, the patch including a bellows, which patch includes a protrusion on an outer surface of an inner leg of the patch member, further including the seal head assembly a spring seat member having in general a U-shaped cross section connected to said patch member on both end walls of the spring seat, the spring seat being in a constant engagement with the protuberance of the patch member; the patch member further comprising a metal liner having a leg portion that is in contact with a spring, an opposite end of this spring being in contact with, and seated upon, said spring seat, the metal liner being at a distance predetermined from an inner edge of the spring seat wall; a circumferential seal sheave inside an indentation of the patch member, and the seal seat assembly including a circumferential seal seat within a patch assembly, said seal member of the patch member having a seal face that is in constant contact with said seal seat
10. 10. The automatic seal device according to claim 9, characterized in that the patch is made of an elastomer.
11. 11. The automatic seal device in accordance with that claimed in claim 9, characterized in that the seal sheave of the patch member is made of a rubber material.
12. 12. The automatic seal device according to claim 9, characterized in that the patch is disposed between the metallic lining and said spring seat.
13. 13. The automatic seal device according to claim 9, characterized in that the predetermined distance is between 25.4 and 152.4 microns.
14. 14. * The automatic seal device according to claim 9, characterized in that the seal seat is made of a ceramic type material.
15. 15. The automatic seal device according to claim 9, characterized in that the patch member includes an angled corner.
16. 16. The automatic seal device as claimed in claim 9, characterized in that the patch member includes a flange portion for receiving the spring seat, said spring seat interengaging with the elastomeric patch for a snap fit inside. of the mentioned seal head assembly.
17. 17. The automatic seal device according to claim 9, characterized in that the spring forces the seal sheave to a constant direct contact with the seal seat, to prevent liquids from flowing around an arrow through the seal. from a hole in the housing.
18. 18. An automatic seal device for use on an arrow inside a pump unit, this automatic seal device comprising: a seal head member and a seal seat member working at the u * h to surround the arrow to prevent leaks; the seal head member includes an elastomeric patch member, said patch member including an outer leg and an inner leg, said outer leg including a flange that radiates inwardly; an internal surface of said outer leg including an indentation, the inner leg including an axial surface and a protuberance, the patch member including at least one bellows disposed between said outer and inner legs; a tubular spring seat member in contact with the inner surface of the outer leg of the patch member and in contact with an inner surface of the inner leg of the patch member, the inner wall of the spring seat member in a contact constant with the protrusion of the inner leg, the spring seat member including an outwardly extending flange, which is secured inside said indentation of the outer leg; a metal lining molded into the inner leg of the patch member, this metal liner having an axial surface, said metal lining being at a predetermined distance from the internal wall of the said spring seat member; a spring disposed radially inside the spring seat member, this spring being in constant contact with the spring seat member and the metal gasket; and a radial sheave radially disposed within the patch member, including this radial seal sheave a seal face that is in constant contact with the seal seat assembly, including this seal seat assembly a seal seat circumferential, said spring providing a biased force to keep the radial seal sheave in constant contact with the mentioned seal seat.
19. 19. The automatic seal device according to claim 18, characterized in that the predetermined distance is between about 2.54 microns 152.4 microns.
20. 20. The automatic seal device as claimed in claim 18, characterized in that the patch member is disposed between the metal liner and the said "spring" seat.