Sensor module positioning block

Abstract

The utility model discloses a sensor module positioning block which comprises a main body (1), a main groove (2) matched with a sensor chip is arranged in the main body (1), and the upper end of the main groove (2) is communicated with a through groove (3). A square groove (4) communicated with the main groove (2) is formed in the lower end of the main body (1), a square bayonet (5) communicated with the through groove (3) is formed in the upper end of the square groove (4), and the square bayonet (5) and the square groove (4) jointly form a stepped channel opening (6); and the other end of the square groove (4) is provided with an oil injection channel (7) communicated with the square groove (4). According to the utility model, the welding ring can be positioned, and the subsequent welding of the welding ring and the PCB bonding pad can be stabilized.

Description

Technical Field

[0001] The utility model relates to the field of sensor components, in particular to a sensor module positioning block. Background Art

[0002] The pressure sensor is composed of a base, a welding ring, a diaphragm, and a PCB pad, wherein the welding ring and the PCB pad are welded together by solder paste, and the installation requirement of the two is that the welding ring and the PCB pad are in a concentric position. There is a sensor disclosed, which includes a body, a PCB, a chip, a base, and a diaphragm. The body is an annular structure, and the interior of the body is an oil-filled cavity; the front of the PCB is sealed and connected with the back of the body; the chip is arranged on the front of the PCB, and the chip is located in the oil-filled cavity; the back of the base is provided with a first groove, and the bottom of the first groove is provided with a first through hole, and the back of the base is sealed and connected with the front of the body; the diaphragm is arranged between the base and the body, and is used to divide the oil-filled cavity and the first groove. However, since the solder paste will have a certain pulling force during the high-temperature melting process, causing the welding ring to deviate, it is easy to cause the production of defective sensors. The welding ring and the PCB pad in this type of sensor completely rely on the operator's operating experience, and the product quality is not easy to guarantee. Utility Model Content

[0003] The purpose of the utility model is to provide a sensor module positioning block, which can position the welding ring and stabilize the subsequent welding of the welding ring and the PCB pad.

[0004] The technical solution of the utility model is as follows: a sensor module positioning block comprises a main body, a main groove matched with a sensor chip is arranged in the main body, and the upper end of the main groove is connected with a through groove; a square groove connected with the main groove is arranged at the lower end of the main body, and a square bayonet connected with the through groove is arranged at the upper end of the square groove, and the square bayonet and the square groove together form a stepped channel opening; the other end of the square groove is provided with an oil injection channel connected with the square groove.

[0005] In the above-mentioned sensor module positioning block, a transition arc is provided at the bottom of the main groove.

[0006] In the aforementioned sensor module positioning block, a guide arc is provided at the opening of the oil injection channel.

[0007] In the aforementioned sensor module positioning block, the outer side of the main body has a stepped annular groove, and the right angle of the stepped annular groove is an arc portion.

[0008] In the aforementioned sensor module positioning block, one end of the main body is provided with a flat surface portion close to the sensor assembly.

[0009] In the aforementioned sensor module positioning block, the lower port of the oil injection channel has a liquid expansion port for facilitating the spreading of the oil.

[0010] In the aforementioned sensor module positioning block, the height of the main body is higher than the thickness of the chip in the sensor module.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] 1. In the utility model, the main groove and the through groove in the main body will fit with the chip of the sensor assembly, and then the welding ring will cooperate with the main body to realize the positioning of the welding ring, and the direction of the main body placement is determined by setting the square groove; by positioning the welding ring, it plays a stabilizing role for the subsequent welding of the welding ring and the PCB pad, ensuring that the welding ring and the PCB pad are in a concentric state.

[0013] 2. The main body has a certain volume thickness and can occupy a certain space in the entire sensor assembly. In the subsequent oil filling process, the amount of oil can be reduced and the cost can be reduced.

[0014] 3. The height of the main body is higher than the thickness of the chip in the sensor module, which can effectively protect the pressure sensing hole on the chip and prevent the pressure sensing hole from being blocked by the pressure of the stainless steel diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 Schematic diagram of a square slot.

[0017] Explanation of the markings in the accompanying drawings: 1. Main body; 2. Main groove; 3. Through groove; 4. Square groove; 5. Square bayonet; 6. Step channel opening; 7. Oil filling channel; 8. Transition arc; 9. Guide arc; 10. Step ring groove; 11. Plane part; 12. Liquid expansion opening. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Embodiment: A sensor module positioning block, including a main body 1, as shown in the attached Figure 1 and 2As shown, the main body 1 has a main groove 2 that matches the sensor chip, and the upper end of the main groove 2 is connected with a through groove 3. The main groove and the through groove can be used to fit the chip, the ring covers the chip, and the bottom of the main body is in contact with the PCB pad; the lower end of the main body 1 is provided with a square groove 4 connected to the main groove 2, and the upper end of the square groove 4 is provided with a square bayonet 5 connected to the through groove 3. The square bayonet 5 and the square groove 4 together form a stepped channel opening 6, which is used to determine the direction in which the main body is placed, and the chip pins can be placed in the stepped channel opening to prevent the tin beads generated when the subsequent welding ring is welded to the PCB pad from causing tin connection to the chip and the chip pins, thereby causing signal loss; the other end of the square groove 4 is provided with an oil injection channel 7 connected to the square groove 4. The sensor involved in this embodiment is an oil-filled piezoresistive sensor. This type of sensor has high reliability and accuracy, is suitable for manufacturing high-precision pressure sensors, and is widely used in industrial control, engineering machinery and other fields. The chip can sense external pressure and convert it into voltage output, but this chip is relatively fragile and not resistant to dust, acid and alkali corrosion. The external packaging structure of the oil-filled core uses a corrugated diaphragm and a metal base to seal the diffused silicon chip, and fills it with silicone oil to conduct external pressure, so that the entire sensor is resistant to acid and alkali corrosion and can work reliably under various harsh working conditions. The bottom of the main groove 2 is provided with a transition arc 8. The lower end of the oil injection channel 7 has a liquid expansion port 12 that facilitates the dispersion of the oil. The opening of the oil injection channel 7 is provided with a guide arc 9. The oil enters from the oil injection channel, and the guide arc at the upper end can make the oil smoothly enter the oil, and finally flow into the main groove through the liquid expansion port, so that the oil fills the main groove and the chip is soaked in the oil. The outer side of the main body 1 has a stepped annular groove 10, and the right angle of the stepped annular groove 10 is an arc portion. The stepped annular groove structure can make the bottom diameter of the main body smaller than the diameter of the main body, so that the main body can be placed more stably. One end of the main body 1 has a flat portion 11 close to the sensor component. Other sensor components are also installed on the PCB pad. The flat portion can be set closely with the sensor component to facilitate better positioning of the main body. The height of the main body 1 is higher than the thickness of the chip in the sensor module, which can effectively protect the pressure sensing hole on the chip and prevent the stainless steel diaphragm from blocking the pressure sensing hole due to pressure.

[0020] The working principle of the utility model is as follows: the main groove and the through groove in the main body will fit with the chip of the sensor component, and then the welding ring will cooperate with the main body to realize the positioning of the welding ring. The direction of the main body placement is determined by setting the square groove. Secondly, it can prevent the tin beads generated when the subsequent welding ring is welded to the PCB pad from causing tin connection to the chip and the chip pins, thereby causing signal loss; the welding ring has a positioning effect, which plays a stabilizing role for the subsequent welding of the welding ring and the PCB pad, ensuring that the welding ring and the PCB pad are in a concentric state.

Claims

1. A sensor module positioning block, characterized in that: The invention comprises a main body (1), wherein a main groove (2) matching with a sensor chip is provided in the main body (1), and the upper end of the main groove (2) is connected with a through groove (3); the lower end of the main body (1) is provided with a square groove (4) connected with the main groove (2), and the upper end of the square groove (4) is provided with a square bayonet (5) connected with the through groove (3), and the square bayonet (5) and the square groove (4) together form a stepped channel opening (6); and the other end of the square groove (4) is provided with an oil injection channel (7) connected with the square groove (4).

2. The sensor module positioning block according to claim 1, characterized in that: The bottom of the main groove (2) is provided with a transition arc (8).

3. The sensor module positioning block according to claim 1, characterized in that: A guide arc (9) is provided at the opening of the oil injection channel (7).

4. The sensor module positioning block according to claim 1, characterized in that: The outer side of the main body (1) is provided with a stepped annular groove (10), and the right angle of the stepped annular groove (10) is an arc portion.

5. The sensor module positioning block according to claim 4, characterized in that: One end of the main body (1) is provided with a plane portion (11) close to the sensor component.

6. The sensor module positioning block according to claim 1, characterized in that: The lower end of the oil injection channel (7) has a liquid expansion port (12) for facilitating the spreading of oil.

7. The sensor module positioning block according to claim 1, characterized in that: The height of the main body (1) is higher than the thickness of the chip in the sensor module.

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