Combined sealing gasket

Abstract

The utility model discloses a combined sealing gasket, which relates to the technical field of sealing gaskets and comprises a rigid gasket and an elastic sealing ring, the thickness of the elastic sealing ring is larger than that of the rigid gasket, the elastic sealing ring is arranged in the rigid gasket, the rigid gasket is arranged in the middle of the elastic sealing ring, and the elastic sealing ring is in interference fit with the rigid gasket. Good sealing can be formed between the needle valve and the oil sprayer body through the elastic sealing ring, the phenomena of oil dripping and excessive oil spraying are avoided, meanwhile, under the condition of high pressure, the rigid gasket can support the elastic sealing ring, the possibility that the elastic sealing ring is extruded and deformed is reduced, and therefore the service life of the elastic sealing ring can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of gaskets, and particularly relates to a combined gasket. Background Art

[0002] The common rail injection fuel supply system consists of a high-pressure fuel pump, a common fuel supply pipe, an injector, an electronic control unit (ECU), and some pipeline pressure sensors. Each injector in the common rail injection fuel supply system is connected to the common fuel supply pipe through its respective high-pressure fuel pipe, and the common fuel supply pipe plays a role of hydraulic pressure accumulation for the injector. During operation, the high-pressure fuel pump transports fuel to the common fuel supply pipe at high pressure. The high-pressure fuel pump, pressure sensor, and ECU form a closed-loop operation to precisely control the oil pressure in the common fuel supply pipe, ensuring that the fuel is only ejected within the predetermined spray time.

[0003] The injector is a precision device with very high machining accuracy, requiring a large dynamic flow range, strong anti-blocking and anti-pollution capabilities, good atomization performance, and high requirements for sealing performance. When the seal between the injector body and the needle valve is poor, there will be oil dripping and over-injection phenomena, which not only pose safety hazards but also increase fuel consumption, making it impossible to accurately measure the fuel injection volume. Therefore, a sealing gasket is installed at the connection between the injector body and the needle valve. The sealing gasket in the prior art is only a simple rubber gasket, which is easily squeezed and deformed under long-term large pressure. Content of the Utility Model

[0004] The purpose of the utility model is to provide a combined gasket, which can support the elastic sealing ring through a rigid washer, reducing the possibility of the elastic sealing ring being squeezed and deformed.

[0005] To achieve the above purpose, the utility model adopts the following technical solution: a combined gasket includes a rigid washer and an elastic sealing ring. The thickness of the elastic sealing ring is greater than that of the rigid washer. The elastic sealing ring is arranged inside the rigid washer, and the rigid washer is arranged in the middle of the elastic sealing ring. The elastic sealing ring and the rigid washer are in interference fit.

[0006] The technical principle of the utility model is as follows:

[0007] The elastic sealing ring can be in contact with both the injector body and the needle valve at the same time. A good seal can be formed between the needle valve and the injector body through the elastic sealing ring. The elastic sealing ring can be supported by the rigid washer, reducing the possibility of the elastic sealing ring being squeezed and deformed, thereby improving the service life of the elastic sealing ring.

[0008] Further, the thickness range of the rigid washer is 3 - 5 mm, and the thickness range of the elastic sealing ring is 6 - 8 mm.

[0009] Further, an arc-shaped groove is formed on the inner side wall of the rigid washer, and the outer side wall of the elastic sealing ring is high in the middle and gradually decreases towards both sides. The inner side wall of the rigid washer is arranged in cooperation with the outer side wall of the elastic sealing ring.

[0010] Further, a groove is formed on the inner side wall of the rigid washer, and a protrusion is provided on the outer side wall of the elastic sealing ring. The protrusion is arranged in cooperation with the groove.

[0011] Further, gaskets are arranged on the upper and lower surfaces of the rigid washer.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. A good seal can be formed between the needle valve and the injector body through the elastic sealing ring, avoiding the phenomena of oil dripping and excessive oil injection. At the same time, under high pressure, the rigid washer can support the elastic sealing ring, reducing the possibility of the elastic sealing ring being squeezed and deformed, thereby improving the service life of the elastic sealing ring.

[0014] 2. Through the cooperative arrangement of the shape of the inner side wall of the rigid washer and the shape of the outer side wall of the elastic sealing ring, it is ensured that the elastic sealing ring is always arranged inside the rigid washer, preventing the rigid washer from falling off the elastic sealing ring. At the same time, the structure of the present utility model is simple, easy to use, has good end face sealing effect and long service life.

[0015] 3. Through the arrangement of the gaskets, the sealing performance between the needle valve and the injector body can be further improved, and the rigid contact between the rigid washer and the needle valve or the injector body can be avoided, improving the service life of the device. Description of the Drawings

[0016] Figure 1 is the first structural schematic diagram of the present utility model;

[0017] Figure 2 is the second structural schematic diagram of the present utility model;

[0018] Figure 3 is the first cross-sectional view of the present utility model;

[0019] Figure 4 is the third structural schematic diagram of the present utility model;

[0020] Figure 5 is the second cross-sectional view of the present utility model.

[0021] In the above-mentioned drawings:

[0022] 1. Rigid washer; 101. Arc-shaped groove; 102. Groove; 2. Elastic sealing ring; 201. Protrusion; 3. Gasket. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments; the structures described in various embodiments can be freely combined without conflicts in terms of structure or principle.

[0024] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0026] The following describes some embodiments of the present utility model in conjunction with the accompanying drawings:

[0027] As Figures 1-5 shown, the present utility model proposes a combined gasket, which includes a rigid washer 1 and an elastic sealing ring 2. The thickness of the elastic sealing ring 2 is greater than the thickness of the rigid washer 1. The elastic sealing ring 2 is arranged inside the rigid washer 1, and the rigid washer 1 is arranged in the middle of the elastic sealing ring 2. The elastic sealing ring 2 is in interference fit with the rigid washer 1.

[0028] The rigid washer 1 is made of 42CrMo material and is quenched and tempered to HRC44 - 48. Through the above treatment, the Rockwell hardness range of the rigid washer 1 is between 44 and 48, meeting the required hardness requirements, so as to avoid the rigid washer 1 being crushed under high pressure; the material of the elastic sealing ring 2 can be silicone rubber (VMQ), fluororubber (FPM), nitrile rubber (NBR), etc. The above materials have excellent oil resistance, elasticity and wear resistance, and can maintain a stable sealing effect under high pressure and high temperature.

[0029] The elastic sealing ring 2 can be in contact with both the fuel injector body and the needle valve simultaneously. Through the elastic sealing ring 2, a good seal can be formed at the connection between the needle valve and the fuel injector body. The rigid washer 1 can support the elastic sealing ring 2, reducing the possibility of the elastic sealing ring 2 being squeezed and deformed, thereby being able to improve the service life of the elastic sealing ring 2.

[0030] Furthermore, as Figure 1 shown, the thickness range of the rigid washer 1 is 3 - 5 mm, and the thickness range of the elastic sealing ring 2 is 6 - 8 mm.

[0031] In actual use, according to the actual distance between the fuel injector body and the needle valve, select the appropriate thicknesses of the rigid washer 1 and the elastic sealing ring 2 to ensure that the thickness of the elastic sealing ring 2 is greater than that of the rigid washer 1, and there is an interference fit between the elastic sealing ring 2 and the fuel injector body and the needle valve. According to the fuel injector in the prior art, the thickness of the rigid washer 1 is preferably 4 mm, and the thickness of the elastic sealing ring 2 is preferably 7 mm. By selecting these thicknesses, the best compressive effect is achieved, further reducing the possibility of the elastic sealing ring 2 being squeezed and deformed, and being able to improve the service life of the elastic sealing ring 2.

[0032] Furthermore, as Figure 2 and Figure 3 shown, an arc-shaped groove 101 is formed on the inner sidewall of the rigid washer 1, and the outer sidewall of the elastic sealing ring 2 is higher in the middle and gradually decreases towards both sides. The inner sidewall of the rigid washer 1 and the outer sidewall of the elastic sealing ring 2 are arranged in cooperation.

[0033] By the cooperation of the inner sidewall of the rigid washer 1 and the outer sidewall of the elastic sealing ring 2, it can be ensured that the rigid washer 1 is always sleeved outside the elastic sealing ring 2 and is not easy to fall off, ensuring the stability of the device.

[0034] Furthermore, as Figure 4 and Figure 5 shown, a groove 102 is formed on the inner sidewall of the rigid washer 1, and a protrusion 201 is provided on the outer sidewall of the elastic sealing ring 2. The protrusion 201 and the groove 102 are arranged in cooperation.

[0035] By the cooperation of the protrusion 201 and the groove 102, it can be ensured that the rigid washer 1 is always sleeved outside the elastic sealing ring 2 and is not easy to fall off, ensuring the stability of the device.

[0036] Furthermore, gaskets 3 are provided on both the upper and lower surfaces of the rigid washer 1.

[0037] Here, the material of the gasket 3 is preferably the same rubber material as the elastic sealing ring 2. Through the setting of the gasket 3, the sealing performance between the needle valve and the fuel injector body can be further improved, and the rigid contact between the rigid washer 1 and the needle valve or the fuel injector body can be avoided, which can improve the service life of the device.

Claims

1. A combined sealing gasket, characterized in that: The invention comprises a rigid gasket (1) and an elastic sealing ring (2); the thickness of the elastic sealing ring (2) is greater than the thickness of the rigid gasket (1); the elastic sealing ring (2) is arranged inside the rigid gasket (1); and the rigid gasket (1) is arranged in the middle of the elastic sealing ring (2); the elastic sealing ring (2) and the rigid gasket (1) are interference fit.

2. A combined sealing gasket according to claim 1, characterized in that: The thickness of the rigid gasket (1) is in the range of 3-5 mm, and the thickness of the elastic sealing ring (2) is in the range of 6-8 mm.

3. A combined sealing gasket according to claim 1 or 2, characterized in that: The inner wall of the rigid gasket (1) is provided with an arc groove (101), and the outer wall of the elastic sealing ring (2) is high in the middle and gradually decreases towards both sides. The inner wall of the rigid gasket (1) and the outer wall of the elastic sealing ring (2) are arranged in coordination.

4. A combined sealing gasket according to claim 1 or 2, characterized in that: The inner wall of the rigid gasket (1) is provided with a groove (102), and the outer wall of the elastic sealing ring (2) is provided with a protrusion (201), and the protrusion (201) is arranged in coordination with the groove (102).

5. A combined sealing gasket according to claim 1 or 2, characterized in that: Gaskets (3) are provided on the surfaces of the upper and lower sides of the rigid gasket (1).

6. A combined sealing gasket according to claim 3, characterized in that: Gaskets (3) are provided on the surfaces of the upper and lower sides of the rigid gasket (1).

7. A combined sealing gasket according to claim 4, characterized in that: Gaskets (3) are provided on the surfaces of the upper and lower sides of the rigid gasket (1).

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