A T-MAP sensor gland exhaust and leak detection structure and sealing method

Abstract

The present invention relates to the technical field of pressure sensors, and specifically to an exhaust and leak detection structure of a T-MAP sensor gland, comprising a gland body, a circular groove is provided along the surface of the gland body, a cylinder perpendicular to the circular groove is provided along the center of the circular groove, and a cylindrical air hole that can penetrate the gland body is provided along the central axis of the cylinder; the height of the cylinder is greater than the depth of the circular groove. This solution is not only simple in structure, but also highly reliable. It can achieve a sealing effect without increasing costs and without the aid of external sealing components. It can not only improve the production and testing efficiency of the product, but also effectively extend the service life of the product.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensors, and in particular to an exhaust and leak detection structure and a sealing method for a T-MAP sensor gland. Background Art

[0002] During the assembly process of the T-MAP sensor, the last step is to glue and bond the gland and the shell and then cure them, so that a closed cavity is formed inside the shell and the gland after gluing. The current process is to make an air vent on the gland that communicates with the outside world. During the curing process of the glue, the gas that expands due to heat is discharged from the cavity through the air vent. Otherwise, the expansion of the heated gas will cause the gland to warp, which will affect the sealing of the outer shell and the appearance of the product. After the glue is cured, it is also necessary to apply compressed air of a certain pressure to the cavity through the air vent to detect whether there is any leakage in the sealed cavity. Products with leakage are called unqualified products and need to be discarded; for qualified products without leakage, the air vent needs to be sealed. The purpose of sealing is to ensure that the later products can be used in various harsh environments without causing damage to the internal components, thereby affecting the measurement accuracy and service life of the product. The current air vent sealing measures are, such as Figure 1 As shown, a steel ball with a diameter slightly larger than the vent hole is riveted into the vent hole reserved on the gland by a riveting device. This operation is a cold processing that relies on the interference fit between the steel ball and the reserved hole in the gland to ensure sealing.

[0003] However, because the steel ball and the vent hole on the gland are sealed by interference, the interference size will change when subjected to hot and cold shocks, which increases the risk of leakage. In addition, the steel ball is made of metal and will corrode or rust if exposed to harsh external environments for a long time, which is not conducive to the safety of the product. A new solution is urgently needed to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned problems of the prior art and to provide a venting and leak detection structure and a sealing method for a T-MAP sensor gland. It is only necessary to make physical changes to the gland body to form a cylinder with a cylindrical air hole. The cylinder is arranged in a circular groove to facilitate riveting and forming by a riveting device. It not only has a simple structure but also has strong reliability. It can achieve a sealing effect without increasing costs and without the aid of external sealing components. It can not only improve the production and testing efficiency of the product, but also effectively extend the service life of the product.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A venting and leak detection structure for a T-MAP sensor gland, comprising a gland body, a circular groove provided along the surface of the gland body, a cylinder perpendicular to the circular groove provided along the center of the circular groove, a cylindrical air hole penetrating the gland body provided along the central axis of the cylinder; the height of the cylinder being greater than the depth of the circular groove.

[0007] Furthermore, a semi-enclosed groove cavity is opened at the bottom of the gland body.

[0008] Furthermore, the circular groove, the cylinder, the cylindrical air hole and the gland body are integrally injection molded.

[0009] Furthermore, a 45° chamfer with a side length of 0.2 mm is provided along the top of the circular groove.

[0010] Furthermore, a 45° chamfer with a side length of 0.5 mm is provided along the bottom of the cylindrical air hole.

[0011] Furthermore, the length of the gland body is 23.8-23.9 mm, the width of the gland body is 19.5-19.6 mm, the height of the gland body is 3-3.2 mm, the depth of the groove cavity is 1.3 mm; the bottom of the cylindrical pore corresponds to the bottom edge of the groove cavity.

[0012] Furthermore, the inner diameter of the cylindrical pore is 0.6 mm, the diameter of the cylinder is 1.7-1.9 mm, the height of the cylinder is 1.3-1.4 mm, the inner diameter of the circular groove is 3-3.1 mm, and the depth of the circular groove is 0.5-0.8 mm.

[0013] Furthermore, the length of the gland body is 71.7-71.8 mm, the width of the gland body is 58.6-58.7 mm, the height of the gland body is 9.3-9.5 mm, the depth of the groove cavity is 4.0 mm; the bottom of the cylindrical pore corresponds to the bottom edge of the groove cavity.

[0014] Furthermore, the inner diameter of the cylindrical pore is 0.8 mm, the diameter of the cylinder is 5.3-5.5 mm, the height of the cylinder is 3.9-4.0 mm, the inner diameter of the circular groove is 8.9-9 mm, and the depth of the circular groove is 1.7-2 mm.

[0015] Furthermore, at least one gland reinforcement rib is provided at the bottom of the groove cavity, and the circular groove corresponds to the gland reinforcement rib.

[0016] A sealing method for an exhaust and leak detection structure of a T-MAP sensor gland comprises the following steps:

[0017] Step (1) installing a rivet head matching the cylinder and the circular groove on a hot press riveting machine and starting the machine for preheating, wherein a port of the rivet head is provided with a hemispherical cavity groove;

[0018] After the leak detection in step (2) is completed, the gland body is placed on the hot press riveting machine, the cylinder is located directly below the rivet head, and the cylindrical pore and the rivet head are located on the same central axis;

[0019] Step (3) moves the rivet head downward until it contacts the circular groove, and after 1 to 5 seconds, lifts the rivet head upward, so that the cylinder forms a hemispherical sealing cover that can seal the cylindrical air hole.

[0020] Beneficial Effects

[0021] The exhaust and leak detection structure and sealing method of a T-MAP sensor gland provided by the present invention only require physical changes to the gland body to form a cylinder with a cylindrical air hole. The cylinder is arranged in a circular groove to facilitate riveting and forming by a riveting device. It not only has a simple structure but also has high reliability. It can achieve a sealing effect without increasing costs and without the aid of external sealing components. It can not only improve the production and testing efficiency of the product, but also effectively extend the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a traditional vent hole sealed with a steel ball;

[0023] Figure 2 A three-dimensional diagram of the exhaust and leak detection structure of a T-MAP sensor gland according to the present invention;

[0024] Figure 3 It is a back schematic diagram of the exhaust and leak detection structure of a T-MAP sensor gland according to the present invention;

[0025] Figure 4 It is a cross-sectional schematic diagram of the exhaust and leak detection structure of a T-MAP sensor gland according to the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the exhaust and leak detection structure of the T-MAP sensor gland after hot-press riveting according to the present invention.

[0027] Reference numerals

[0028] 1- gland body, 2- circular groove, 3- cylinder, 4- cylindrical air hole, 5- groove cavity, 6- gland reinforcement rib, 7- hemispherical sealing cover, 8- air outlet, 9- steel ball DETAILED DESCRIPTION

[0029] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0030] like Figure 1 As shown, as a traditional exhaust and leak detection structure of the T-MAP sensor gland, an exhaust hole 8 is punched on the gland body 1. After the exhaust and leak detection are completed, a steel ball 9 with a diameter slightly larger than the aperture of the exhaust hole 8 is directly riveted into the exhaust hole 8 by a riveting device, thereby achieving the purpose of sealing the exhaust hole 8.

[0031] As an improvement of the traditional structure, such as Figure 2-4 As shown, a venting and leak detection structure of a T-MAP sensor gland comprises a gland body 1, a circular groove 2 is provided along the surface of the gland body 1, a cylinder 3 perpendicular to the circular groove 2 is provided along the center position of the circular groove 2, and a cylindrical air hole 4 that can penetrate the gland body 1 is provided along the central axis of the cylinder 3; the height of the cylinder 3 is greater than the depth of the circular groove 2.

[0032] Specifically, in this embodiment, a semi-enclosed groove cavity 5 is opened at the bottom of the gland body 1, and the edge of the groove cavity 5 is used for point gluing and curing with the shell.

[0033] In this embodiment, the circular groove 2 , the cylinder 3 , the cylindrical air hole 4 and the gland body 1 are integrally injection molded.

[0034] As an optimization of this embodiment:

[0035] A 45° chamfer with a side length of 0.2 mm is provided along the top of the circular groove 2. This arrangement facilitates the riveting equipment to be well positioned with the cylinder 3;

[0036] like Figure 3 As shown, a 45° chamfer with a side length of 0.5 mm is provided along the bottom of the cylindrical air hole 4 .

[0037] As a specific implementation of this embodiment:

[0038] The length of the gland body 1 is 23.8-23.9 mm, the width of the gland body 1 is 19.5-19.6 mm, the height of the gland body 1 is 3-3.2 mm, and the depth of the groove cavity 5 is 1.3 mm; the bottom of the cylindrical air hole 4 corresponds to the bottom edge of the groove cavity 5. The inner diameter of the cylindrical air hole 4 is 0.6 mm, the diameter of the cylinder 3 is 1.7-1.9 mm, the height of the cylinder 3 is 1.3-1.4 mm, the inner diameter of the circular groove 2 is 3-3.1 mm, and the depth of the circular groove 2 is 0.5-0.8 mm.

[0039] As another specific implementation of this embodiment:

[0040] The length of the gland body 1 is 71.7-71.8 mm, the width of the gland body 1 is 58.6-58.7 mm, the height of the gland body 1 is 9.3-9.5 mm, and the depth of the groove cavity 5 is 4.0 mm; the bottom of the cylindrical air hole 4 corresponds to the bottom edge of the groove cavity 5. The inner diameter of the cylindrical air hole 4 is 0.8 mm, the diameter of the cylinder 3 is 5.3-5.5 mm, the height of the cylinder 3 is 3.9-4.0 mm, the inner diameter of the circular groove 2 is 8.9-9 mm, and the depth of the circular groove 2 is 1.7-2 mm.

[0041] In the above embodiment, if Figure 3 As shown, in order to increase the strength of the gland body 1 , at least one gland reinforcement rib 6 is provided at the bottom of the groove cavity 5 , and correspondingly, the circular groove 2 corresponds to the gland reinforcement rib 6 .

[0042] like Figure 5 As shown, after the leak detection is completed, the cylindrical pore 4 needs to be sealed to achieve the purpose of sealing the internal components. The top of the cylinder 3 is riveted by a matching hot press riveting machine to form a hemispherical sealing cover 7 that can seal the cylindrical pore 4.

[0043] Specifically, a sealing method for the exhaust and leak detection structure of a T-MAP sensor gland includes the following steps:

[0044] Step (1) installing a rivet head matching the cylinder 3 and the circular groove 2 on a hot press riveting machine and starting the machine for preheating, wherein a port of the rivet head is provided with a hemispherical cavity groove;

[0045] After the leak detection in step (2) is completed, the gland body 1 is placed on the hot press riveting machine, the cylinder 3 is located directly below the rivet head, and the cylindrical pore 4 and the rivet head are located on the same central axis;

[0046] In step (3), the rivet head is moved downward until it contacts the circular groove 2 , and the rivet head is lifted upward after 1 to 5 seconds, so that the cylinder 3 forms a hemispherical sealing cover 7 that can seal the cylindrical air hole 4 .

[0047] The hemispherical sealing cover 7 matches the hemispherical cavity of the rivet head port.

[0048] The above description is only for illustrating the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing method for the exhaust and leak detection structure of a T-MAP sensor gland, characterized in that: The exhaust and leak detection structure of the T-MAP sensor gland includes a gland body, a circular groove is provided along the surface of the gland body, a cylinder is provided at the center of the circular groove and is perpendicular to the circular groove, and a cylindrical air hole is provided along the central axis of the cylinder and can penetrate the gland body; the height of the cylinder is greater than the depth of the circular groove; The sealing method comprises the following steps: Step (1) installing a rivet head matching the cylinder and the circular groove on a hot press riveting machine and starting the machine for preheating, wherein a port of the rivet head is provided with a hemispherical cavity groove; After the leak detection in step (2) is completed, the gland body is placed on the hot press riveting machine, the cylinder is located directly below the rivet head, and the cylindrical pore and the rivet head are located on the same central axis; Step (3) moves the rivet head downward until it contacts the circular groove, and after 1 to 5 seconds, lifts the rivet head upward, so that the cylinder forms a hemispherical sealing cover that can seal the cylindrical air hole.

2. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 1, characterized in that: A semi-enclosed groove cavity is formed at the bottom of the gland body.

3. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 1, characterized in that: The circular groove, the cylinder, the cylindrical air hole and the gland body are integrally injection molded.

4. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 1, characterized in that: A 45° chamfer with a side length of 0.2 mm is provided along the top of the circular groove.

5. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 1, characterized in that: A 45° chamfer with a side length of 0.5 mm is provided along the bottom of the cylindrical air hole.

6. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 2, characterized in that: The length of the gland body is 23.8-23.9 mm, the width of the gland body is 19.5-19.6 mm, the height of the gland body is 3-3.2 mm, the depth of the groove cavity is 1.3 mm; the bottom of the cylindrical pore corresponds to the bottom edge of the groove cavity.

7. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 5, characterized in that: The inner diameter of the cylindrical pore is 0.6 mm, the diameter of the cylinder is 1.7-1.9 mm, the height of the cylinder is 1.3-1.4 mm, the inner diameter of the circular groove is 3-3.1 mm, and the depth of the circular groove is 0.5-0.8 mm.

8. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 2, characterized in that: The length of the gland body is 71.7-71.8 mm, the width of the gland body is 58.6-58.7 mm, the height of the gland body is 9.3-9.5 mm, the depth of the groove cavity is 4.0 mm; the bottom of the cylindrical pore corresponds to the bottom edge of the groove cavity.

9. The sealing method of the exhaust and leak detection structure of the T-MAP sensor gland according to claim 8, characterized in that: The inner diameter of the cylindrical pore is 0.8 mm, the diameter of the cylinder is 5.3-5.5 mm, the height of the cylinder is 3.9-4.0 mm, the inner diameter of the circular groove is 8.9-9 mm, and the depth of the circular groove is 1.7-2 mm.

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