Oil spill prevention pressure sensor with biased pressure sensing unit

Abstract

The utility model relates to an oil spill prevention pressure sensor with a biased pressure sensing unit, which comprises an upper shell and a lower shell, a through hole is arranged in the middle of the upper shell, a cavity is arranged on the lower shell, the upper shell is fixedly connected onto the lower shell, sealant and a circuit board are arranged in the cavity of the lower shell, and the circuit board is fixedly connected onto the upper shell. The circuit board is provided with a pressure sensing unit, the pressure sensing unit and the through hole are arranged in a staggered manner, a contact pin is embedded in the lower shell, the upper end of the contact pin is electrically connected with the circuit board, the sealant coats the upper end of the contact pin and the circuit board, and the pressure sensing unit is not coated by the sealant. A gap is reserved between the sealant and the upper shell, and the through hole is communicated with the gap. The beneficial effects of the utility model are that the structure that the pressure sensing unit is biased and is matched with the pouring sealant is adopted, so that the service life of the circuit board and the pressure sensing unit is prolonged, the damage probability is reduced, and the influence of oil leakage on the circuit board can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to an anti-oil overflow pressure sensor with a biased pressure sensing unit. Background Art

[0002] Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, pipelines, etc.

[0003] An existing type of oil pressure sensor, when detecting pressure, in a sealed environment, after oil penetrates into the sensor housing, the pressure value is detected by the pressure sensing unit. The existing pressure sensing unit is usually arranged directly below the through hole, and the oil pressure it receives is relatively large, and the service life is relatively low. In addition, the circuit board with weak pressure bearing capacity may be damaged, and oil leakage may occur at the connection between the pin and the lower housing. Therefore, an anti-oil overflow pressure sensor with a biased pressure sensing unit is needed. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-oil overflow pressure sensor with a biased pressure sensing unit. The structure of the biased pressure sensing unit combined with the injection sealant can increase the service life of the circuit board and the pressure sensing unit, reduce the probability of damage, and avoid the impact of oil leakage on the circuit board.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-overflow pressure sensor with a biased pressure sensing unit, comprising an upper shell and a lower shell, a through hole being opened in the middle of the upper shell, a cavity being opened on the lower shell, the upper shell being fixedly connected to the lower shell, a sealant and a circuit board being arranged in the cavity of the lower shell, a pressure sensing unit being arranged on the circuit board, the pressure sensing unit being staggered with the through hole, a pin being embedded in the lower shell, the upper end of the pin being electrically connected to the circuit board, the sealant being coated on the upper end of the pin and the circuit board, the pressure sensing unit being not coated with the sealant, a gap being left between the sealant and the upper shell, and the through hole being connected to the gap.

[0006] Furthermore, an outer sealing ring is mounted on the outer wall of the upper shell, and an inner sealing ring is mounted on the outer wall of the lower shell.

[0007] Furthermore, an annular groove is formed on both the upper shell and the lower shell, and the outer sealing ring and the inner sealing ring are both located in the annular groove.

[0008] Furthermore, the sealant is specifically epoxy resin sealant.

[0009] Furthermore, the upper end surface of the sealant is a plane.

[0010] Furthermore, the lower shell is provided with an anti-fouling protrusion, and the circuit board is provided with a groove.

[0011] The beneficial effects of the present invention are as follows: the use of a pressure sensing unit biased structure combined with a sealant injection structure increases the service life of the circuit board and the pressure sensing unit, reduces the probability of damage, and can prevent oil seepage from affecting the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Fig. 1 This is a schematic diagram of the exploded perspective of the present invention.

[0013] Fig. 2 It is a front sectional view of the present utility model.

[0014] In the figure: 1. Upper shell; 101. Through hole; 102. Outer sealing ring; 2. Lower shell; 201. Cavity; 202. Pin; 3. Inner sealing ring; 4. Circuit board; 401. Pressure sensing unit; 5. Sealant. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] refer to Figs. 1-2 The shown embodiment shows an anti-overflow oil pressure sensor with a biased pressure sensing unit, comprising an upper shell 1 and a lower shell 2. A through hole 101 is opened in the middle of the upper shell 1, and a cavity 201 is opened on the lower shell 2. The upper shell 1 is fixedly connected to the lower shell 2. A sealant 5 and a circuit board 4 are arranged in the cavity 201 of the lower shell 2. A pressure sensing unit 401 is arranged on the circuit board 4. The pressure sensing unit 401 is staggered with the through hole 101. A pin 202 is embedded in the lower shell 2, and the upper end of the pin 202 is electrically connected to the circuit board 4. The sealant 5 is coated on the upper end of the pin 202 and the circuit board 4. The pressure sensing unit 401 is not coated by the sealant 5. A gap is left between the sealant 5 and the upper shell 1, and the through hole 101 is connected to the gap.

[0017] An outer sealing ring 102 is mounted on the outer wall of the upper shell 1, and the outer sealing ring 102 can ensure the sealing of the upper shell 1 when the utility model is installed. An inner sealing ring 3 is mounted on the outer wall of the lower shell 2, and the inner sealing ring 3 can ensure the sealing of the connection between the lower shell 2 and the upper shell 1.

[0018] Annular grooves are provided on both the upper shell 1 and the lower shell 2 , and the outer sealing ring 102 and the inner sealing ring 3 are both located in the annular grooves. The annular grooves can limit the outer sealing ring 102 and the inner sealing ring 3 to prevent misalignment.

[0019] The sealant 5 is specifically epoxy resin sealant, which has excellent sealing properties and high bonding strength.

[0020] The upper end surface of the sealant 5 is flat, which improves the fluidity of oil injection.

[0021] The lower shell 2 is provided with anti-fouling protrusions, and the circuit board 4 is provided with grooves, so as to facilitate the installation of the circuit board 4 at a specified angle.

[0022] The working principle of the present invention is: oil enters the gap through the through hole of the upper shell 1, and the pressure sensing unit 401 senses the hydraulic pressure and feeds back pressure data. The present invention adopts a structure in which the pressure sensing unit 401 is offset and the sealant 5 is injected to increase the service life of the circuit board 4 and the pressure sensing unit 401, reduce the probability of damage, and avoid the impact of oil leakage on the circuit board 4.

[0023] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be understood to be within the scope of protection of the present invention.

Claims

1. An anti-overflow oil pressure sensor with a biased pressure sensing unit, characterized in that: The invention comprises an upper shell (1) and a lower shell (2), wherein a through hole (101) is formed in the middle of the upper shell (1), and a cavity (201) is formed on the lower shell (2), wherein the upper shell (1) is fixedly connected to the lower shell (2), and a sealant (5) and a circuit board (4) are provided in the cavity (201) of the lower shell (2), and a pressure sensing unit (401) is provided on the circuit board (4), and the pressure sensing unit (401) is staggered with the through hole (101), and a pin (202) is embedded in the lower shell (2), and the upper end of the pin (202) is electrically connected to the circuit board (4), and the sealant (5) is coated on the upper end of the pin (202) and the circuit board (4), and the pressure sensing unit (401) is not coated by the sealant (5), and a gap is left between the sealant (5) and the upper shell (1), and the through hole (101) is connected to the gap.

2. The anti-overflow oil pressure sensor with a biased pressure sensing unit according to claim 1, characterized in that: An outer sealing ring (102) is sleeved on the outer wall of the upper shell (1), and an inner sealing ring (3) is sleeved on the outer wall of the lower shell (2).

3. The anti-overflow oil pressure sensor with a biased pressure sensing unit according to claim 2, characterized in that: An annular groove is provided on both the upper shell (1) and the lower shell (2), and the outer sealing ring (102) and the inner sealing ring (3) are both located in the annular groove.

4. The anti-oil overflow pressure sensor with a biased pressure sensing unit according to claim 1, characterized in that: The sealant (5) is specifically an epoxy resin sealant.

5. The anti-overflow oil pressure sensor with a biased pressure sensing unit according to claim 4, characterized in that: The upper end surface of the sealant (5) is a plane.

6. The anti-overflow oil pressure sensor with a biased pressure sensing unit according to claim 1, characterized in that: The lower shell (2) is provided with an anti-fouling protrusion, and the circuit board (4) is provided with a groove.

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