Sensor

Abstract

The utility model relates to the technical field of pressure sensing, in particular to a sensor. A sensor comprises a core body and a shell, and the shell is provided with a cavity for installing the core body. The top and the bottom are oppositely arranged in the height direction X of the cavity, and the side portion is located between the top and the bottom. The top part is open, and grooves are formed in the bottom part and / or the side parts; and the groove extends towards the direction far away from the core body. Provided is a sensor that does not easily sense abnormalities after long-term use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure sensing, in particular to a sensor. BACKGROUND

[0002] The pressure sensor is one of the important components of the automobile air conditioning system. The pressure collection mode of the pressure sensor is that the pressure sensing surface of the ceramic pressure-sensitive core body senses the refrigerant pressure. The principle is that the refrigerant is introduced into the pressure chamber through the pipeline at the bottom of the metal aluminum shell and directly contacts the pressure sensing surface of the ceramic pressure-sensitive core body, so that the pressure sensing surface of the ceramic pressure-sensitive core body deforms and the capacitance of the core body changes.

[0003] The pressure chamber is jointly constituted by the shell, the sealing element and the ceramic pressure-sensitive core body, and the ceramic pressure-sensitive core body is assembled into the shell. Under the existing structure, the slight deformation of the ceramic pressure-sensitive core body caused by temperature change or the slight deformation caused by pressure during long-term use cannot be released, which causes extrusion stress at the contact surface between the ceramic pressure-sensitive core body and the shell and causes pressure sensing abnormality. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a sensor which is not easy to cause sensing abnormality during long-term use.

[0005] A sensor comprises a core body and a shell, the shell has a chamber for mounting the core body; the chamber has a top portion and a bottom portion which are oppositely arranged along the height direction X thereof, and a side portion between the top portion and the bottom portion; the top portion is provided with an opening, and a recess is formed in the bottom portion and / or the side portion; the recess is arranged to extend in a direction away from the core body.

[0006] In one of the embodiments, the recess is formed in the bottom portion.

[0007] In one of the embodiments, the recess is formed in the bottom portion at a position corresponding to the connection with the side portion, and the recess is arranged to extend along the height direction X of the chamber.

[0008] In one of the embodiments, the opening of the recess in communication with the bottom portion is in an expanded state, and the inner surface of the opening and the bottom portion are arranged to be continuous surfaces.

[0009] In one of the embodiments, an opening groove is formed in the shell to form the chamber; or, the shell comprises a shell body and a mounting element, the opening groove is formed in the shell body, the mounting element is arranged in the opening groove, and the inner wall of the opening groove and the side wall of the mounting element surround to form the chamber; the recess is formed in the mounting element.

[0010] In one of the embodiments, the depth of the recess is H1, and the thickness of the core body is T1, and T1 and H1 satisfy the following relationship: 0.2≥H1 / T1≥0.1.

[0011] In one of the embodiments, the sensor further comprises a sealing member, which is press-fitted between the core and the bottom; the bottom is provided with a mounting groove at the position corresponding to the sealing member, and the sealing member is partially arranged in the mounting groove.

[0012] In one of the embodiments, the width of the sealing member is D1, the width of the mounting groove is D2, D1 and D2 satisfy the relationship: D1 < D2; and / or, the mounting groove is arranged along the height direction X of the cavity, the depth of the mounting groove is H2, the thickness of the sealing member is T2, H2 and T2 satisfy the following relationship: 0.4 ≥ H2 / T2 ≥ 0.3.

[0013] In one of the embodiments, the diameter of the cavity is R, R satisfies the relationship: 21mm ≥ R ≥ 18mm.

[0014] In one of the embodiments, the sensor is a pressure sensor, and the sensor further comprises a plug-in member and a circuit board, one side of the circuit board is connected with the plug-in member along the thickness direction of the circuit board, and the other end is connected with the core; one end of the plug-in member connected with the circuit board is plugged into the cavity, and the diameter of the cavity and the outer diameter of the plug-in member are matched.

[0015] Compared with the prior art, the sensor is provided with a groove in the bottom and / or side of the shell cavity, and the deformation of the core caused by temperature change during use of the sensor can be released through the groove, so as to effectively offset the thermal stress between the core and the shell; in long-term use, the deformation of the core caused by the refrigerant pressure can be released through the groove, so as to avoid the extrusion stress at the contact surface between the core and the shell, avoid the abnormal pressure sensing, and improve the service life and detection accuracy of the sensor. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The sensor structure schematic diagram provided by the present application.

[0018] Figure 2 The shell structure schematic diagram provided by the present application.

[0019] Figure 3 The Figure 2 The enlarged view of A in the middle.

[0020] Figure 4 Structure diagram of another embodiment of the shell provided in the present application.

[0021] Figure 5 Structure diagram of another embodiment of the shell provided in the present application. Figure 1 Structure diagram of another embodiment of the shell provided in the present application.

[0022] Figure 6 Structure diagram of another embodiment of the shell provided in the present application.

[0023] Reference signs: 1, core; 2, shell; 200, open slot; 201, shell body; 202, mounting; 21, cavity; 22, top; 23, bottom; 24, side; 25, recess; 26, mounting slot; 3, sealing member; 4, plug; 5, circuit board; 6, external sealing ring. DETAILED DESCRIPTION

[0024] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those specifically described herein, and it is to be understood that the present application is not limited to the specific embodiments described herein and that the specific embodiments are presented for illustrative purposes only. It is therefore clear that the scope of the present application is not limited to the specific embodiments disclosed and that many modifications and other embodiments can be made without departing from the scope of the present application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be an intervening component. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the description of the present application are used for illustrative purposes only and do not indicate the only orientation of the present application.

[0026] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0027] In the present application, unless specifically defined and limited otherwise, the first feature is "on", "under", "above" or "over" the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature is "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0029] Please refer to Figures 1 to 6 The present application provides a sensor, comprising a core 1 and a shell 2. Specifically, the shell 2 has a cavity 21 for mounting the core 1. The cavity 21 has a top 22 and a bottom 23 arranged opposite along the height direction X of itself, and a side 24 between the top 22 and the bottom 23. The top 22 is provided with an opening, and the bottom 23 and / or the side 24 is provided with a groove 25. The groove 25 is arranged extending away from the core 1.

[0030] It can be understood that the core 1 is assembled in the cavity 21, and the pressure sensing surface of the core 1 corresponds to the bottom 23 of the cavity 21, and the side 24 of the cavity 21 corresponds to the outer wall of the core 1. During use of the sensor, the core 1 will expand and deform due to temperature changes, and a small part of the core 1 can be squeezed into the groove 25, so that the deformation of the core 1 is released, effectively offsetting the thermal stress between the core 1 and the shell 2; in the long run, the deformation of the core caused by the pressure of the refrigerant can be released through the groove, avoiding extrusion stress at the contact surface between the core 1 and the shell 2, avoiding abnormal pressure sensing, and improving the service life and detection accuracy of the sensor.

[0031] In an embodiment, the groove 25 is provided on the bottom 23. The bottom 23 is the pressure sensing surface of the core 1, which is more likely to deform under the influence of the detected substance, and the groove 25 provided on the bottom 23 can better release the deformation of the core 1. Secondly, it is easier to process the groove 25 on the bottom 23, and the processing cost and difficulty are lower.

[0032] Of course, not limited to this, in other embodiments, the groove 25 can also be provided on the side 24.

[0033] As a preference, the recess 25 is arranged at the connecting position of the bottom 23 and the side 24. The recess 25 is arranged along the height direction X of the chamber 21. The connecting position of the bottom 23 and the side 24 has the least influence on the structure of the chamber 21 itself, and can further ensure the stability of the sensor test result.

[0034] In an embodiment, the opening of the recess 25 communicating with the bottom 23 is in an expanded state, and the inner surface of the opening and the bottom 23 are arranged in a continuous surface.

[0035] Understandably, the expanded state makes it easier for a small part of the core 1 to be extruded into the recess 25, and the continuity of the inner surface of the opening and the bottom 23 makes it less likely to generate shear force on the core 1 extruded into the recess 25 compared to the case where the two are beveled, reducing the possibility of damage to the core 1.

[0036] Exemplarily, the inner surface of the opening and the bottom 23 are arranged in a continuous inclined surface. Of course, it is not limited to this, and can also be arranged as a continuous arc surface or a smooth surface, etc., which can be selected according to actual needs.

[0037] Exemplarily, the inclined surface and the plane of the bottom 23 form an included angle a, and the angle of the included angle a can be 20°, 25°, 30°, 35°, 40°, etc. Of course, the angle of the included angle a can also be selected according to the actual situation, and will not be described here.

[0038] In an embodiment, an opening groove 200 is arranged on the shell 2 to form the chamber 21. The inner wall of the opening groove is the inner wall of the chamber.

[0039] Of course, it is not limited to this, and in other embodiments, the shell 2 includes a shell body 201 and a mounting member 202. The shell body 201 has an opening groove 200, and the mounting member 202 is arranged in the opening groove 200, and the inner wall of the opening groove 200 and the side wall of the mounting member 202 form the chamber 21.

[0040] Further, the recess 25 is arranged on the mounting member 202. This facilitates processing.

[0041] Exemplarily, the top surface of the mounting member 202 constitutes the bottom 23 of the chamber 21. The recess 25 is arranged on the top surface of the mounting member 202, i.e., on the bottom 23 of the chamber 21.

[0042] Of course, in other embodiments, the top surface of the mounting member 202 and the bottom surface of the opening groove 200 can jointly constitute the bottom 23 of the chamber 21.

[0043] Further, the depth of the groove 25 is H1. The thickness of the core 1 is T1, and T1 and H1 satisfy the following relationship: 0.2≥H1 / T1≥0.1. In the range of the ratio, the depth of the groove is set more reasonably, and the deformation of the core can be better released.

[0044] Exemplarily, the value of H1 / T1 can be 0.1, 0.12, 0.14, 0.16, 0.18, 2.0, etc. Of course, the value of H1 / T1 can also select the corresponding value according to the actual situation, which is not described here.

[0045] In the embodiment, H1 satisfies the following relationship: 2mm≥H1≥0.5mm. Exemplarily, the value of H1 can be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc. Of course, the value of H1 can also select the corresponding value according to the actual situation, which is not described here.

[0046] Exemplarily, the thickness of the core 1 is 3mm-4mm. It can be 3mm, 3.3mm, 3.4mm, 3.54mm, 3.64mm, 3.8mm, 4mm, etc. Of course, the value of the core thickness can also select the corresponding value according to the actual situation, which is not described here.

[0047] In an embodiment, the sensor further comprises a sealing member 3. The sealing member 3 is pressed between the core 1 and the bottom 23. The bottom 23 is provided with a mounting groove 26 at the position corresponding to the sealing member 3, and the sealing member 3 is partially arranged in the mounting groove 26.

[0048] As can be understood, when the sealing member 3 is installed, it is usually placed into the cavity 21 manually or mechanically, and the sealing member 3 is prone to distortion during the placement process and is pressed into place in a distorted state. After the mounting groove 26 is provided, when the sealing member 3 is placed into the cavity 21, it is first placed into the mounting groove 26, the position of the sealing member 3 is positioned through the mounting groove 26, and then the sealing member 3 can be pressed into place after it returns to the normal state. This avoids affecting the sealing performance due to the distortion of the sealing member 3 and ensures that the sealing performance of the sensor is not affected.

[0049] Exemplarily, the sealing member 3 is of an annular structure, such as a sealing ring.

[0050] Further, the width of the sealing member 3 is set as D1, and the width of the mounting groove 26 is set as D2. In the embodiment, D1 and D2 satisfy the relationship: D1

[0051] As can be understood, the width of the mounting groove 26 is set to be greater than the thickness of the sealing member 3, so that the sealing member 3 has enough space to recover after being placed in the mounting groove 26.

[0052] In an embodiment, the mounting groove 26 is arranged along the height direction X of the chamber 21. The depth of the mounting groove 26 is H2, and the thickness of the sealing member 3 is T2. The ratio of H2 to T2 satisfies the following relationship: 0.4≥H2 / T2≥0.3.

[0053] It can be understood that the depth of the mounting groove 26 is set to be smaller than the thickness of the sealing member 3, so that after the sealing member 3 is placed in the mounting groove 26, part of the sealing member 3 is still higher than the bottom 23 of the mounting groove 26 (extends out of the plane of the bottom 23 of the chamber 21), ensuring that the sealing member 3 can still be in sealing contact with the core 1 after being placed in the mounting groove 26.

[0054] For example, the value of H2 / T2 can be 3.1, 3.12, 3.14, 3.16, 3.18, 4.0, etc. Of course, the value of H2 / T2 can also be selected according to the actual situation, and details are not described here.

[0055] Further, H2 satisfies the following relationship: 1mm≥H2≥0.5mm. For example, the value of H2 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Of course, the value of H2 can also be selected according to the actual situation, and details are not described here.

[0056] Further, the sensor further comprises a plug-in part 4 and a circuit board 5. Along the thickness direction of the circuit board 5 itself, one side of the circuit board 5 is connected with the plug-in part 4, and the other end is connected with the core 1. One end of the plug-in part 4 connected with the circuit board 5 and the core 1 is inserted into the chamber 21, and the diameter of the chamber 21 matches the outer diameter of the plug-in part 4.

[0057] For example, one side of the circuit board 5 is welded with the plug-in part 4, and the other end is welded with the core 1. The side of the shell 2 away from the plug-in part 4 is also sleeved with an external sealing ring 6.

[0058] During assembly, one side of the circuit board 5 is welded with the plug-in part 4, and the other side of the circuit board 5 is welded with the core 1. Then the sealing member 3 is placed into the mounting groove 26, and after the sealing member 3 is in a normal state, one end of the plug-in part 4 is inserted into the chamber 21 together with the circuit board 5 and the core 1 which are welded, to complete the basic assembly. Then the sensor is tested electrically, and after the test is normal, it is placed into a servo press for riveting and sealing. After sealing, size checking is performed, and after no abnormalities are found, the riveting interface is sealed with sealant. Finally, the external sealing ring 6 is sleeved on the side of the shell 2 away from the plug-in part 4, and the assembly is completed.

[0059] In an embodiment, the diameter of the chamber 21 is R, and the relationship satisfies: 21mm≥R≥18mm. Under this diameter, the shell 2 can adapt to the core 1 with a diameter of 18mm-21mm and the plug-in part 4 with different electrical interface forms, and the application range is wider.

[0060] Exemplarily, the value of R can be 18mm, 19m, 20, 21mm. Of course, the value of R can also be selected according to the actual situation, and the corresponding value is not described here.

[0061] Exemplarily, the sensor is a pressure sensor.

[0062] Exemplarily, the sealing member 3 can be made of rubber, resin and the like. The external sealing ring 6 can be made of rubber, resin and the like.

[0063] Exemplarily, the core 1 can be a ceramic pressure-sensitive core 1. The shell 2 can be a metal aluminum shell 2. The circuit board 5 can be a flexible circuit board 5. The sealing glue can be RTV rubber.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0065] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A sensor comprising a core (1) and a housing (2), the housing (2) having a chamber (21) for mounting the core (1); characterized in that, The chamber (21) has a top (22) and a bottom (23) arranged opposite to each other along its height direction X, and a side portion (24) located between the top (22) and the bottom (23); the top (22) is provided with an opening, and the bottom (23) and / or the side portion (24) are provided with a groove (25); the groove (25) extends in a direction away from the core (1).

2. The sensor according to claim 1, characterized in that, The groove (25) is formed at the bottom (23).

3. The sensor according to claim 2, characterized in that, The groove (25) is formed at the connection between the bottom (23) and the side (24), and the groove (25) extends along the height direction X of the chamber (21).

4. The sensor according to claim 2, characterized in that, The opening of the groove (25) communicating with the bottom (23) is in an expanded state, and the inner surface of the opening is set as a continuous surface with the bottom (23).

5. The sensor according to claim 1, characterized in that, The outer shell (2) has an opening groove (200) to form the cavity (21); or, the outer shell (2) includes a shell (201) and a mounting member (202), the shell (201) has an opening groove (200), the mounting member is disposed in the opening groove (200), and the inner wall of the opening groove (200) and the side wall of the mounting member (202) surround each other to form the cavity (21); the groove (25) is formed on the mounting member (202).

6. The sensor according to any one of claims 1-5, characterized in that, The depth of the groove (25) is H1, and the thickness of the core (1) is T1. T1 and H1 satisfy the following relationship: 0.2≥H1 / T1≥0.

1.

7. The sensor according to claim 1, characterized in that, The sensor also includes a seal (3), which is press-fitted between the core (1) and the bottom (23); the bottom (23) has an installation groove (26) at the position corresponding to the seal (3), and part of the seal (3) is placed in the installation groove (26).

8. The sensor according to claim 7, characterized in that, The width of the seal (3) is D1, and the width of the mounting groove (26) is D2. D1 and D2 satisfy the relationship: D1 < D2; and / or, the mounting groove (26) extends along the height direction X of the chamber (21), the depth of the mounting groove (26) is H2, and the depth of the seal (3) is T2. H2 and T2 satisfy the following relationship: 0.4 ≥ H2 / T2 ≥ 0.

3.

9. The sensor according to claim 1, 7, or 8, characterized in that, The diameter of the chamber (21) is R, and R satisfies the relationship: 21mm ≥ R ≥ 18mm.

10. The sensor according to claim 1, 7, or 8, characterized in that, The sensor is a pressure sensor, and the sensor also includes a connector (4) and a circuit board (5). Along the thickness direction of the circuit board (5), one side of the circuit board (5) is connected to the connector (4), and the other end is connected to the core (1). One end of the connector (4) that connects the circuit board (5) and the core (1) is inserted into the chamber (21), and the diameter of the chamber (21) matches the outer diameter of the connector (4).

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