Sensor sealing structure

Abstract

The utility model relates to the technical field of sensors, and provides a sensor sealing structure which is characterized in that the sensor sealing structure comprises a connecting nut and a sealing ring, the connecting nut is arranged on a shell of a fuel filter, and a sensor is in threaded connection with the connecting nut; the sealing ring is arranged between the sensor and the connecting nut, and the sealing ring is located between the inner side wall of the connecting nut and the outer side wall of the sensor. By means of the technical scheme, the problems that in the related technology, when the pressure in the fuel filter is positive, the sealing ring is subjected to outward jacking pressure, the sealing ring is prone to being separated from the connecting nut and the sensor, and the sealing effect cannot be effectively achieved are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, and in particular to a sensor sealing structure. Background Art

[0002] The sensor is connected to the fuel filter by a threaded nut. To improve the sealing effect, a sealing ring is set between the outer end face of the connecting nut and the sensor. When the inside of the fuel filter is under negative pressure, the sealing ring can effectively seal the filter. When the inside of the fuel filter is under positive pressure, the sealing ring will be subjected to outward pressure, and the sealing ring is prone to separating from the connecting nut and the sensor, thus failing to provide an effective seal. Utility Model Content

[0003] The utility model provides a sensor sealing structure, which solves the problem in the related art that when the internal pressure of the fuel filter is positive, the sealing ring will be subjected to outward pressure, the sealing ring will easily separate from the connecting nut and the sensor, and the sealing effect cannot be effectively achieved.

[0004] The technical solution of the utility model is as follows: A sensor sealing structure, the key is: including,

[0005] A connecting nut, the connecting nut being arranged on the housing of the fuel filter, and the sensor being threadedly connected to the connecting nut;

[0006] A sealing ring is disposed between the sensor and the connecting nut, and the sealing ring is located between the inner side wall of the connecting nut and the outer side wall of the sensor.

[0007] An annular groove is formed on the inner wall of the outer end of the connecting nut, and the sealing ring is disposed between the annular groove and the sensor.

[0008] The annular groove includes:

[0009] The equal-diameter groove has a width d along the radial direction of the connecting nut, and the cross-sectional diameter of the sealing ring is D, where d is less than D;

[0010] The reducing groove is located outside the constant diameter groove, and the diameter of the reducing groove gradually increases from one end close to the constant diameter groove to the other end.

[0011] The wall of the variable diameter groove is arc-shaped.

[0012] The ratio of d to D is 0.2-0.3.

[0013] An annular positioning slot is provided on the outer wall of the connecting nut, and the housing is inserted into the positioning slot.

[0014] The depth of the positioning slot is h1, the wall thickness of the connecting nut is h2, and the ratio of h1 to h2 is 0.6-0.7.

[0015] It also includes a sealing ring, on which a sealing groove is formed, the sealing groove communicating with the positioning slot, the sealing groove being located inside the positioning slot, and the sealing ring being disposed at the sealing groove.

[0016] The depth of the positioning slot along the axial direction of the connecting nut gradually increases from the outside to the inside.

[0017] The sensor includes,

[0018] A sensor body, wherein the sensor body is disposed on the outside of the housing;

[0019] A connecting post is provided with an external thread, and the connecting post is threadedly connected to the connecting nut by means of the external thread. The outer end face of the connecting nut contacts the sensor body. A sealing ring is fitted around the connecting post and is located between the external thread and the sensor body.

[0020] The working principle and beneficial effects of the utility model are as follows: the connecting nut is arranged on the housing of the fuel filter, and the sensor is threadedly connected to the connecting nut; the sealing ring is arranged between the sensor and the connecting nut, and the sealing ring is located between the inner side wall of the connecting nut and the outer side wall of the sensor. When the inside of the fuel filter is under positive pressure, the sealing ring will be subjected to outward pressing pressure. At this time, the connecting nut can limit the sealing ring, prevent the sealing ring from separating from the connecting nut and the sensor, and can better achieve the sealing effect. Attached Figure Description

[0021] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0022] Figure 1 It is a structural diagram of the present utility model.

[0023] Figure 2 for Figure 1 A magnified view of center.

[0024] Figure 3 This is a schematic diagram of the connecting nut in this utility model.

[0025] In the diagram: 1. Connecting nut, 2. Housing, 3. Sensor, 3-1. Sensor body, 3-2. Connecting post, 3-3. External thread, 4. Sealing ring, 5. Annular groove, 5-1. Equal diameter groove, 5-2. Variable diameter groove, 6. Positioning slot, 7. Sealing ring, 8. Sealing groove. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0027] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0028] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] Example, refer to Figures 1-2 , which is an embodiment of the present utility model, proposes a sensor sealing structure, including a connecting nut 1 and a sealing ring 4. The connecting nut 1 is arranged on the housing 2 of the fuel filter, and the sensor 3 is threadedly connected to the connecting nut 1; the sealing ring 4 is arranged between the sensor 3 and the connecting nut 1, and the sealing ring 4 is located between the inner wall of the connecting nut 1 and the outer wall of the sensor 3.

[0031] Furthermore, an annular groove 5 is provided on the inner wall of the outer end of the connecting nut 1, and a sealing ring 4 is provided between the annular groove 5 and the sensor 3. Figure 1 and Figure 2 As shown, the annular groove 5 can limit the sealing ring 4, preventing the sealing ring 4 from deviating toward the inside of the housing 2 under the action of external force, thereby improving the sealing effect.

[0032] Furthermore, the annular groove 5 includes a constant diameter groove 5-1 and a variable diameter groove 5-2. The width of the constant diameter groove 5-1 along the radial direction of the connecting nut 1 is d, and the cross-sectional diameter of the sealing ring 4 is D, which is smaller than D. The variable diameter groove 5-2 is located outside the constant diameter groove 5-1, and the diameter of the variable diameter groove 5-2 gradually increases from one end close to the constant diameter groove 5-1 to the other end. Figure 3 As shown, the step at the inner end of the equal-diameter groove 5-1 can limit the sealing ring 4 to prevent the sealing ring 4 from deviating toward the inside of the shell 2 under the action of external force, and the variable-diameter groove 5-2 allows the sealing ring 4 to have a sufficiently large deformation space.

[0033] Furthermore, the groove wall of the variable diameter groove 5-2 is an arc-shaped surface, such as... Figure 3 As shown, the arc-shaped surface can increase the contact area between the sealing ring 4 and the connecting nut 1, thereby improving the sealing effect.

[0034] Furthermore, the ratio of d to D is 0.2-0.3, that is, the ratio of d to D can be 0.2:1, or 0.3:1, or 0.27:1, so that the equal-diameter groove 5-1 can effectively limit the sealing ring 4 along the axial direction of the connecting nut 1, and the sealing ring 4 can have a sufficiently wide part exposed outside the annular groove 5, so as to have a sufficiently large deformation capacity.

[0035] Furthermore, an annular positioning slot 6 is provided on the outer wall of the connecting nut 1, and the housing 2 is inserted into the positioning slot 6. For example... Figure 1 and Figure 2 As shown, the housing 2 is plugged into the positioning slot 6 on the outer wall of the connecting nut 1, which can limit the connecting nut 1 and prevent the connecting nut 1 from shifting axially under the action of external force, making the connection more firm and reliable and the sealing effect better.

[0036] Furthermore, the depth of the positioning slot 6 is h1, the wall thickness of the connecting nut 1 is h2, and the ratio of h1 to h2 is 0.6-0.7. Figure 3 As shown, the ratio of h1 to h2 can be 0.6:1, or 0.7:1, or 0.66:1, which requires that the positioning slot 6 has a sufficiently large depth so that a sufficiently long portion of the housing 2 can be inserted into the positioning slot 6 to effectively limit the connecting nut 1. At the same time, it is also necessary to avoid the positioning slot 6 being too deep to affect the strength of the connecting nut 1.

[0037] Furthermore, it also includes a sealing ring 7, and a sealing groove 8 is provided on the connecting nut 1. The sealing groove 8 communicates with the positioning slot 6 and is located inside the positioning slot 6. The sealing ring 7 is disposed at the sealing groove 8. Figure 2 and Figure 3 As shown, the sealing ring 7 is located between the connecting nut 1 and the housing 2 and on the inner side of the housing 2 , which can improve the sealing effect between the connecting nut 1 and the housing 2 .

[0038] Furthermore, the depth of the positioning slot 6 along the axial direction of the connecting nut 1 gradually increases from the outside to the inside. Figure 2 and Figure 3 As shown, the depth of the positioning slot 6 gradually increases, which can reduce the bending requirement on the outer end of the connecting nut 1 while ensuring reliable sealing between the connecting nut 1 and the housing 2.

[0039] Furthermore, the sensor 3 includes a sensor body 3-1 and a connecting post 3-2. The sensor body 3-1 is arranged outside the housing 2. The connecting post 3-2 is provided with an external thread 3-3. The connecting post 3-2 is threadedly connected to the connecting nut 1 via the external thread 3-3. The outer end surface of the connecting nut 1 contacts the sensor body 3-1. The sealing ring 4 is sleeved on the outer periphery of the connecting post 3-2 and is located between the external thread 3-3 and the sensor body 3-1. Figure 2 As shown, the sealing ring 4 is located in the cavity between the sensor body 3-1, the connecting column 3-2, the external thread 3-3 and the connecting nut 1. The connecting column 3-2 can position the sealing ring 4 to prevent the sealing ring 4 from shifting radially. The connecting column 3-2 and the connecting nut 1 can cooperate to limit the sealing ring 4 radially. The sensor body 3-1 and the external thread 3-3 can cooperate to limit the sealing ring 4 axially, so that the sealing ring 4 can better perform the sealing function.

[0040] In this embodiment, the sealing ring 4 is mounted on the outer periphery of the connecting column 3-2 of the sensor 3, located in the annular groove 5 of the connecting nut 1, and located between the sensor body 3-1 and the external thread 3-3. The sensor 3 is threadedly connected to the connecting nut 1 through the external thread 3-3. When the internal pressure of the fuel filter is positive, the sealing ring 4 will be subjected to outward pushing pressure. At this time, the connecting nut 1 can limit the sealing ring 4, preventing the sealing ring 4 from separating from the connecting nut 1 and the sensor 3, thereby achieving a better sealing effect.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A sensor sealing structure, characterized in that: include, A connecting nut (1), the connecting nut (1) being arranged on a housing (2) of a fuel filter, and the sensor (3) being threadedly connected to the connecting nut (1); A sealing ring (4), the sealing ring (4) being arranged between the sensor (3) and the connecting nut (1), the sealing ring (4) being located between the inner side wall of the connecting nut (1) and the outer side wall of the sensor (3).

2. A sensor sealing structure according to claim 1, characterized in that: An annular groove (5) is provided on the inner wall of the outer end of the connecting nut (1), and the sealing ring (4) is arranged between the annular groove (5) and the sensor (3).

3. A sensor sealing structure according to claim 2, characterized in that: The annular groove (5) comprises: An equal-diameter groove (5-1), wherein the width of the equal-diameter groove (5-1) along the radial direction of the connecting nut (1) is d, and the cross-sectional diameter of the sealing ring (4) is D, and d is smaller than D; A diameter-changing groove (5-2), wherein the diameter-changing groove (5-2) is located outside the equal-diameter groove (5-1), and the diameter of the diameter-changing groove (5-2) gradually increases from one end close to the equal-diameter groove (5-1) to the other end.

4. A sensor sealing structure according to claim 3, characterized in that: The groove wall of the diameter-changing groove (5-2) is an arc-shaped surface.

5. A sensor sealing structure according to claim 3, characterized in that: The ratio of d to D is 0.2-0.

3.

6. A sensor sealing structure according to claim 1, characterized in that: An annular positioning slot (6) is provided on the outer wall of the connecting nut (1), and the housing (2) is plugged into the positioning slot (6).

7. A sensor sealing structure according to claim 6, characterized in that: The depth of the positioning slot (6) is h1, the wall thickness of the connecting nut (1) is h2, and the ratio of h1 to h2 is 0.6-0.

7.

8. A sensor sealing structure according to claim 6, characterized in that: It also comprises a sealing ring (7), a sealing groove (8) is provided on the connecting nut (1), the sealing groove (8) is communicated with the positioning slot (6), the sealing groove (8) is located inside the positioning slot (6), and the sealing ring (7) is arranged at the sealing groove (8).

9. A sensor sealing structure according to claim 6, characterized in that: The depth of the positioning slot (6) along the axial direction of the connecting nut (1) gradually increases from the outside to the inside.

10. The sensor sealing structure according to claim 1, characterized in that: The sensor (3) comprises: A sensor body (3-1), the sensor body (3-1) being arranged outside the housing (2); A connecting column (3-2), wherein the connecting column (3-2) is provided with an external thread (3-3), the connecting column (3-2) is threadedly connected to the connecting nut (1) by means of the external thread (3-3), and the outer end surface of the connecting nut (1) is in contact with the sensor body (3-1); the sealing ring (4) is sleeved on the outer periphery of the connecting column (3-2), and the sealing ring (4) is located between the external thread (3-3) and the sensor body (3-1).

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