Lip-shaped sealing ring with low insertion force and good sealing performance

Abstract

The utility model discloses a lip-shaped sealing ring with low insertion force and good sealing performance, which comprises a first sealing lip and a second sealing lip, wherein the first sealing lip is in contact with an insertion female head to realize sealing; the second sealing lip is connected with the upper end of the first sealing lip and is in contact with an insertion male head to realize sealing; the second sealing lip obliquely extends downwards and is in contact with the outer wall of the plug male head to realize sealing, and a V-shaped groove is formed between the lower end of the first sealing lip and the second sealing lip; the first sealing lip comprises a first outer lip surface and a first inner lip surface which are oppositely arranged left and right, and an upper sealing surface and a lower sealing surface which are oppositely arranged up and down; the second sealing lip comprises a second outer lip face and a second inner lip face which are oppositely arranged. According to the utility model, the strength and the service life of the sealing ring can be ensured, the assembly difficulty between the plug male head and the plug female head can be reduced, and the sealing effect between the plug male head and the plug female head is improved.

Description

[0001] The utility model belongs to the technical field of sealing ring, especially, relate to a lip seal with low insertion force and good sealing performance.

[0002] In the development history of the quick connector for vehicle, the sealing ring has been an important accessory to ensure the sealing performance of the cooling system of the vehicle. With the development of electric vehicles, the quick connector is more commonly and frequently used. With the emphasis of automobile manufacturers on human-machine engineering, the high assembly force and sealing performance of the quick connector are gradually valued. During assembly, the sealing ring is first placed in the limiting groove 201 on the inner wall of the plug female head 200, and then the plug male head 300 is inserted into the plug female head 200, and the sealing ring is sleeved on the outer periphery of the plug male head 300, so as to realize the sealing of the plug female head 200 and the plug male head 300. During insertion, the resistance of the sealing ring to the plug male head is called insertion force F. If the insertion force F is too small, the sealing effect will be poor. If the insertion force F is too large, the resistance will be large when the plug male head 300 is assembled into the plug female head 200, which will increase the assembly difficulty and thus reduce the assembly efficiency. Therefore, the reasonable setting of the insertion force F plays a key role in the sealing performance and assembly efficiency.

[0003] In the prior art, a kind of extrusion type lip seal disclosed in Chinese patent authorized publication No.CN217422193U includes first sealing lip and second sealing lip;The first sealing lip has upper sealing surface, lower sealing surface, first inner lip surface and first outer lip surface;The second sealing lip has second inner lip surface and second outer lip surface, V-shaped groove is formed between the second inner lip surface and the first inner lip surface, the angle of the V-shaped groove is 40°~50°, and the second outer lip surface is parallelly arranged with the first outer lip surface;In the above scheme, there are still the following two problems:

[0004] (1) When the angle of V-shaped groove is 40°~50°, the angle is relatively large, and the pressure required for the second sealing lip to deform when the plug male head 300 is inserted is relatively large, i.e., the insertion force is relatively large, which will increase the assembly difficulty and thus reduce the assembly efficiency;

[0005] ​​(2) the second outer lip surface is arranged in parallel with the first outer lip surface, and when the first outer lip surface is in contact with the groove wall of the limiting groove 201 of the plug female head 200, the second outer lip surface is in contact with the outer wall of the plug male head 300, and as can be seen from the description of the drawings, the second outer lip surface is arranged in parallel with the first outer lip surface and remains in a vertical state, when the vertical plug male head 300 is just inserted into the plug female head 200 and is in contact with the sealing ring, the lower end of the second outer lip surface is completely in contact with the outer wall of the plug male head 300, and when the plug male head 300 is further inserted, the lower end of the second outer lip surface is elastically deformed and is extruded into the V-shaped groove and is extruded to the side of the first inner lip surface due to the V-shaped groove formed between the second inner lip surface and the first inner lip surface, and the lower end of the second outer lip surface is deformed greatly, and the upper end of the second outer lip surface is deformed slightly, therefore, when the plug male head 300 is inserted into position, the lower end of the second outer lip surface is deformed greatly, and the sealing property of the lower end of the second outer lip surface and the plug male head 300 is poor, and the sealing property between the lip-shaped sealing ring and the plug male head 300 is mainly realized by the upper end of the second outer lip surface being in contact with the plug male head 300 to form a seal, and the contact area is small, and the sealing effect is poor.

[0006] Therefore, it is necessary to provide a lip-shaped sealing ring with low insertion force and good sealing property to solve the above technical problems.

Utility model content

[0007] The main purpose of the utility model is to provide a lip-shaped sealing ring with low insertion force and good sealing property, which can not only ensure the strength and service life of the sealing ring, but also reduce the assembly difficulty between the plug male head and the plug female head and improve the sealing effect between the plug male head and the plug female head.

[0008] The utility model discloses a lip-shaped sealing ring with low insertion force and good sealing property, which comprises a first sealing lip in contact with a plug female head to realize sealing and a second sealing lip connected with the upper end of the first sealing lip and in contact with a plug male head to realize sealing, the second sealing lip extends downwardly and obliquely and is in contact with the outer wall of the plug male head to realize sealing, and a V-shaped groove is formed between the lower end of the first sealing lip and the second sealing lip.

[0009] Further, the second outer lip surface and the second inner lip surface both extend downwardly and obliquely, and the second outer lip surface is in contact with the outer wall of the plug male head to realize sealing.

[0010] Further, the first inner lip surface and the second inner lip surface form the V-shaped groove, a groove bottom of the V-shaped groove is transitioned through a first circular arc B, and an included angle between the first inner lip surface and the second inner lip surface on both sides of the V-shaped groove is an angle A.

[0011] Further, the angle A is set to 33°-37°.

[0012] Further, the first circular arc B is set to a circular arc with a radius of 0.35-0.40 mm.

[0013] Further, a connection between the first outer lip surface and the lower sealing surface is transitioned through a second circular arc C, and the second circular arc C is set to be profiled with a groove bottom of a limiting groove of a female plug.

[0014] Further, the first outer lip surface is outwardly convex with an arc convex sealing part.

[0015] Further, a guide surface for facilitating insertion of a male plug into the second sealing lip is arranged between the upper sealing surface and the second outer lip surface, and the guide surface is set to be angled with an axial direction of the female plug.

[0016] Further, the guide surface is set to be angled with the axial direction of the female plug at an angle of 50°-60°.

[0017] Further, the guide surface is located obliquely above the second outer lip surface, and an arc convex part is formed at a connection between the guide surface and the second outer lip surface, and when the male plug is inserted into the second sealing lip through the guide surface, a bottom of the male plug first contacts the arc convex part.

[0018] Compared with the prior art, the lip-shaped sealing ring has the advantages that:

[0019] (1) The second sealing lip is obliquely extended downward, and in the whole process of insertion of the male plug, the second sealing lip is elastically deformed and squeezed into the V-shaped groove, the second inner lip surface is close to the first inner lip surface, and the second outer lip surface is sealed with the outer wall of the male plug, so that the sealing area is increased and the sealing effect is improved.

[0020] (2) the first inner lip surface and the second inner lip surface form a V-shaped groove, the groove bottom of the V-shaped groove is transitioned through a first circular arc B, the included angle of the first inner lip surface and the second inner lip surface on both sides of the V-shaped groove is angle A, the angle A is set to 33°-37°, the first circular arc B is set to a circular arc with a radius of 0.35-0.40 mm, the parameter setting of the angle A can not only ensure the sealing between the plug male head and the second sealing lip, but also make the insertion force low and appropriate, and can reduce the assembly difficulty; the parameter setting of the first circular arc B can not only ensure the strength of the second sealing lip, but also make the insertion force low and appropriate, and can reduce the assembly difficulty;

[0021] (3) the first outer lip surface is in contact sealing with the limiting groove side wall of the plug female head, and an arc-shaped protruding sealing part protrudes outward on the first outer lip surface, compared with an ordinary straight outer wall, the elastic deformation amount after being pressed can be obviously increased, the bearing capacity of the sealing ring is enhanced, thereby the damage to the sealing ring is reduced, and the service life of the sealing ring is prolonged;

[0022] (4) a guide surface that facilitates the insertion of the plug male head into the second sealing lip is arranged between the upper sealing surface and the second outer lip surface, the guide surface is arranged at an angle with the axial direction of the plug female head, the guide surface is arranged to be in contact with the plug male head first, so that the plug male head is slid onto the second outer lip surface of the second sealing lip from the guide surface, and the guide surface can reduce the acting force when the plug male head is inserted, and facilitates the plug male head to quickly enter the lip-shaped sealing ring and realize sealing with the second sealing lip. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 it is the cross section structure schematic diagram that the low insertion force and the good lip-shaped sealing ring of the utility model embodiment realize the sealing between the plug female head and the plug male head;

[0024] Figure 2 it is the cross section structure schematic diagram of the low insertion force and the good lip-shaped sealing ring of the utility model embodiment;

[0025] Figure 3 it is the cross section structure schematic diagram that the arc-shaped part outer periphery of the bottom of the plug male head is in contact with the arc-shaped protrusion when the plug male head is just inserted;

[0026] Figure 4 it is the cross section structure schematic diagram that the plug male head is in contact sealing with the arc-shaped protrusion and the second outer lip surface when the insertion force of the plug male head is maximum;

[0027] Figure 5 it is the cross section structure schematic diagram that the plug male head is in contact sealing with the arc-shaped protrusion and the second outer lip surface when the plug male head is inserted into position;

[0028] Numerical indication in the drawing:

[0029] 100 - lip seal with low insertion force and good sealing performance; 200 - female connector, 201 - limiting groove; 300 - male connector, 301 - arc-shaped part, 302 - straight wall;

[0030] 1 - first sealing lip, 11 - first outer lip surface, 111 - arc-shaped convex sealing part, 12 - first inner lip surface, 13 - upper sealing surface, 14 - lower sealing surface;

[0031] 2 - second sealing lip, 21 - second outer lip surface, 22 - second inner lip surface, 23 - connecting surface;

[0032] 3 - V-shaped groove; 4 - guiding surface; 5 - arc-shaped protrusion.

DETAILED DESCRIPTION

[0033] Please refer to Figures 1-5 The embodiment is a lip seal with low insertion force and good sealing performance 100, which is used to realize the sealing between a female connector 200 and a male connector 300. The lip seal with low insertion force and good sealing performance 100 includes a first sealing lip 1 in contact with the female connector 200 to realize sealing, and a second sealing lip 2 connected to the upper end of the first sealing lip 1 and in contact with the male connector 300 to realize sealing. The second sealing lip 2 extends downwardly and is in contact with the outer wall of the male connector 300 to realize sealing. A V-shaped groove 3 is formed between the lower end of the first sealing lip 1 and the second sealing lip 2.

[0034] The first sealing lip 1 includes a first outer lip surface 11 and a first inner lip surface 12 arranged oppositely, and an upper sealing surface 13 and a lower sealing surface 14 arranged oppositely. The second sealing lip 2 includes a second outer lip surface 21 and a second inner lip surface 22 arranged oppositely, and a connecting surface 23 connecting the second outer lip surface 21 and the second inner lip surface 22.

[0035] The second outer lip surface 21 and the second inner lip surface 22 both extend downwardly. Preferably, the second outer lip surface 21 and the second inner lip surface 22 are arranged in parallel. The second outer lip surface 21, the connecting surface 23, and the second inner lip surface 22 form an inclined U-shaped surface structure. In other embodiments, the second outer lip surface 21 and the second inner lip surface 22 are arranged at an angle. The angle is set according to the actual sealing scene and is not limited herein. When the second sealing lip 2 is in contact with the male connector 300 to realize sealing, the second outer lip surface 21 is in contact with the outer wall of the male connector 300 to realize sealing. At the same time, the second sealing lip 2 is elastically deformed by being extruded by the male connector 300, and the second sealing lip 2 is extruded into the V-shaped groove 3.

[0036] The first inner lip surface 12 and the second inner lip surface 22 form a V-shaped groove 3, the groove bottom of the V-shaped groove 3 is transitioned through a first circular arc B, and the included angle of the first inner lip surface 12 and the second inner lip surface 22 on both sides of the V-shaped groove 3 is an angle A. When the plug-in male head 300 is inserted, the second sealing lip 2 will be elastically deformed and be extruded to the side of the first inner lip surface 12, and the angle A will gradually decrease. The setting of the angle A is very critical to the insertion force of the plug-in male head 300. When the angle A is large, the second sealing lip 2 is upwardly buckled, the second sealing lip 2 is severely extruded after the plug-in male head 300 is inserted, the deformation amount of the second sealing lip 2 is large, the sealing between the first sealing lip 2 and the plug-in male head 300 is good, but the pressure required for the deformation of the second sealing lip 2 is large, that is, the insertion force is large, which increases the assembly difficulty and reduces the assembly efficiency. When the angle A is small, the deformation amount of the second sealing lip 2 is small, and the sealing between the plug-in male head 300 and the second sealing lip 2 is poor. In order to reduce the assembly difficulty and also ensure the sealing, preferably, the angle A is set to 33°-37°, which can not only ensure the sealing between the plug-in male head 300 and the second sealing lip 2, but also appropriately reduce the insertion force and make it appropriate, thereby reducing the assembly difficulty. The size of the first circular arc B will affect the strength of the second sealing lip 2. When the first circular arc B is too large, the pressure required for the deformation of the second sealing lip 2 is large, that is, the insertion force is large, which increases the assembly difficulty and reduces the assembly efficiency. When the first circular arc B is too small, cracks are prone to occur at the first circular arc B when the second sealing lip 2 is deformed, and the first circular arc B is prone to cracking after the plug-in male head 300 is repeatedly inserted and pulled out, thereby reducing the strength of the second sealing lip 2. In order to reduce the assembly difficulty and also ensure the strength of the second sealing lip 2, the first circular arc B is set to a circular arc with a radius of 0.35-0.40 mm, and preferably, the first circular arc B is set to R0.38, that is, the first circular arc B is set to a circular arc with a radius of 0.38 mm, which can not only ensure the strength of the second sealing lip 2, but also appropriately reduce the insertion force and make it appropriate, thereby reducing the assembly difficulty.

[0037] The first outer lip surface 11 is in contact with the side wall of the limiting groove 201 of the plug-in female head 200 for sealing, and the upper sealing surface 13 and the lower sealing surface 14 are respectively in contact with the upper and lower groove walls of the limiting groove 201 of the plug-in female head 200 for sealing. In order to better realize the sealing between the first sealing lip 1 and the plug-in female head 200, the connection between the first outer lip surface 11 and the lower sealing surface 14 is transitioned through a second circular arc C, and the second circular arc C is shaped with the groove bottom of the limiting groove 201 of the plug-in female head 200, so as to improve the sealing effect of the first sealing lip 1 and the plug-in female head 200. The first outer lip surface 11 outwardly protrudes an arc-shaped protruding sealing part 111. Compared with the ordinary straight outer wall, the elastic deformation amount after being pressed can be obviously increased, the bearing capacity of the sealing ring is enhanced, the damage to the sealing ring is reduced, and the service life of the sealing ring is prolonged.

[0038] The guide surface 4 is arranged between the upper sealing surface 13 and the second outer lip surface 21, and is arranged at an angle with respect to the axial direction of the female connector 200. The position where the guide surface 4 contacts the upper sealing surface 13 is at a high position, and the position where the guide surface 4 contacts the second outer lip surface 21 is at a low position. The guide surface 4 is arranged at an angle of 50°-60° with respect to the axial direction of the female connector 200, and preferably at an angle of 55°. The guide surface 4 is arranged to be contacted by the male connector 300 first, so that the male connector 300 slides from the guide surface 4 to the second outer lip surface 21 of the second sealing lip 2. The guide surface 4 can reduce the force acting on the male connector 300 when the male connector 300 is inserted, and facilitate the male connector 300 to enter the lip-shaped sealing ring quickly and realize sealing with the second sealing lip 2.

[0039] The guide surface 4 is located obliquely above the second outer lip surface 21, and an arc-shaped protrusion 5 is formed at the connection between the guide surface 4 and the second outer lip surface 21, as shown in FIG. 4. Figure 3 When the male connector 300 is inserted into the second sealing lip 2 through the guide surface 4, the outer periphery of the arc-shaped portion 301 at the bottom of the male connector 300 first contacts and seals the arc-shaped protrusion 5. Compared with a common straight outer wall, the elastic deformation amount after being pressed can be obviously increased, the bearing capacity of the sealing ring is enhanced, the damage to the sealing ring is reduced, and the service life of the sealing ring is prolonged. Figure 4 When the male connector 300 is continuously inserted into the lip-shaped sealing ring, the outer periphery of the arc-shaped portion 301 of the male connector 300 contacts the second outer lip surface 21, and the second sealing lip 2 is elastically deformed as a whole by the male connector 300. The second sealing lip 2 is extruded into the V-shaped groove 3, the second inner lip surface 22 approaches the first inner lip surface 12, and the angle A becomes smaller. At this time, the insertion force is the largest, and the arc-shaped protrusion 5 and the second outer lip surface 21 both contact and seal the outer periphery of the arc-shaped portion 301 of the male connector 300. Figure 5As shown, when the plug 300 is continuously inserted into position, the outer periphery of the straight wall 302 of the plug 300 will be sealed with the lip-shaped sealing ring, the second sealing lip 2 will be further pressed and elastically deformed by the plug 300, the second sealing lip 2 is further pressed into the V-shaped groove 3, the second inner lip surface 22 is further close to the first inner lip surface 12, and the angle A becomes smaller. At this time, the arc-shaped protrusion 5 and the second inner lip surface 22 will be in contact with the outer periphery of the arc-shaped portion 301 of the plug 300, so that the arc-shaped protrusion 5 and the second inner lip surface 22 are in contact with the outer periphery of the arc-shaped portion 301 of the plug 300 when the plug 300 is inserted into position. The entire contact surface of the second inner lip surface 22 is always in good sealing with the outer wall of the plug 300. When the plug 300 is not inserted, the second sealing lip 2 extends downwardly and elastically deforms as a whole and is pressed into the V-shaped groove 3 during the entire process of inserting the plug 300. The second inner lip surface 22 is further close to the first inner lip surface 12, and the second outer lip surface 21 is in sealing with the outer wall of the plug 300 as a whole, which can improve the sealing area and the sealing effect.

[0040] In the embodiment, the lip-shaped sealing ring 100 with low insertion force and good sealing performance is made of acrylic rubber or hydrogenated nitrile rubber and has great elasticity. In other embodiments, the sealing ring with appropriate material can be selected according to the use environment, and the sealing ring only needs to have appropriate elasticity to better realize the supporting effect of the sealing ring.

[0041] The above only describes some embodiments of the present application. Those skilled in the art can make some modifications and improvements without departing from the concept of the present application, and these modifications and improvements are within the protection scope of the present application.

Claims

1. A lip seal ring having low insertion force and good sealability for achieving sealing between a female spigot and a male spigot, characterized by: The first sealing lip is provided with a first outer lip surface and a first inner lip surface arranged oppositely, and an upper sealing surface and a lower sealing surface arranged oppositely.

2. The lip seal ring having low insertion force and good sealing performance according to claim 1, characterized in that: The second outer lip surface and the second inner lip surface are both inclined downward.

3. The lip seal ring having low insertion force and good sealing performance according to claim 1, characterized in that: The first inner lip surface and the second inner lip surface form the V-shaped groove, and the groove bottom of the V-shaped groove is connected by a first circular arc B.

4. The lip seal ring having low insertion force and good sealing performance according to claim 3, characterized in that: The angle A is set to be 33°-37°.

5. The lip seal ring having low insertion force and good sealing performance according to claim 3, characterized in that: The first circular arc B is set to be a circular arc with a radius of 0.35-0.40 mm.

6. The lip seal ring having low insertion force and good sealing performance according to claim 1, characterized in that: The first outer lip surface and the lower sealing surface are connected by a second circular arc C, and the second circular arc C is shaped according to the groove bottom of the limiting groove of the plug female head.

7. The lip seal ring having low insertion force and good sealing performance according to claim 1, wherein: The first outer lip surface is provided with an arc-shaped convex sealing part outwardly.

8. The lip seal ring of claim 1, wherein: An inclined surface is arranged between the upper sealing surface and the second outer lip surface, and the inclined surface is arranged at an angle with the axial direction of the plug female head.

9. The lip seal ring having low insertion force and good sealing performance according to claim 8, characterized in that: The inclined surface is arranged at an angle of 50°-60° with the axial direction of the plug female head.

10. The lip seal ring having low insertion force and good sealing performance according to claim 8, characterized in that: The inclined surface is arranged above the second outer lip surface, and an arc-shaped convex part is arranged at the connection between the inclined surface and the second outer lip surface. When the plug male head is inserted into the second sealing lip through the inclined surface, the bottom of the plug male head first contacts the arc-shaped convex part.

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