Air conditioner pressure sensor

Abstract

The utility model relates to an air conditioner pressure sensor, which comprises an upper shell, a circuit board, a core body, a lower shell and a base, the core body is welded with the circuit board, the core body and the circuit board are embedded in the lower shell, the lower shell is embedded in the base, the upper shell is fixedly connected with the base, and the lower shell comprises a first mounting cavity for the core body and the circuit board to be embedded and mounted. A metal shielding cover is fixedly connected in the first installation cavity, the part, arranged in the first installation cavity, of the metal shielding cover is exposed, the circuit board is provided with a plurality of pins in a surrounding mode along the core body, the pins abut against the exposed part of the metal shielding cover, and the metal shielding cover is fixedly installed in the lower shell to cover an external electric field, so that the interior of the lower shell is not affected. The metal shielding case is in electrostatic balance in the external electric field, the pins of the circuit board abut against the metal shielding case, so that the internal field intensity is always equal to zero, the external electric field does not affect the internal space, and interference signals are shielded.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an air-conditioning pressure sensor. Background Art

[0002] Air conditioning pressure sensors achieve fine control of the entire system by measuring pressure changes in the refrigeration system. These sensors can convert pressure changes into electronic signals. After receiving these signals, the ECU engine control unit or CPU main control board will perform logical analysis and make corresponding adjustment instructions. When the pressure in the system is abnormal, whether it is too high or too low, the control system will cut off the power supply of the compressor in time to prevent damage to the compressor caused by insufficient lubrication or abnormal pressure.

[0003] The publication number is: CN206235428U. A pressure sensor for air conditioning is disclosed, including a base assembly as a pressure introduction end, and an upper shell located above the base assembly. A cavity is defined between the base assembly and the upper shell. The base assembly is used to be sealed and connected to the air-conditioning refrigeration equipment. A valve needle is provided at the pressure guide port of the base assembly. A core body is fixedly arranged in the cavity, and a buffer mesh cap is arranged between the base assembly and the core body. The pressure sensing element and the amplification circuit of the core body are integrated into a single chip package; the core body is connected to a PCB board, and the PCB board is connected to a Packard male end arranged outside the upper shell. The product has a small appearance, is easy to install, and a special valve needle is designed for the pressure guide port.

[0004] In modern automobiles, the dense arrangement of various electronic devices and modules makes electromagnetic interference a common problem. Without proper signal shielding, the above-mentioned air-conditioning pressure sensor does not shield the interference signal. The signal emitted by the pressure sensor will be interfered by other electronic components, resulting in data transmission errors or failures. The interference signal will cause the ECU engine control unit to receive wrong data and cause system misjudgment. This misjudgment will cause the system to respond inappropriately, incorrectly adjust the working state of the compressor, and affect the cooling effect of the air-conditioning system. Therefore, there is still room for modification of the above-mentioned air-conditioning pressure sensor. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an air-conditioning pressure sensor in view of the deficiencies of the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an air-conditioning pressure sensor, comprising an upper shell, a circuit board, a core, a lower shell, and a base, the core and the circuit board are welded, the core and the circuit board are embedded in the lower shell, the lower shell is embedded in the base, the upper shell is fixedly connected to the base, and is characterized in that: the lower shell comprises a first installation cavity for embedded installation of the core and the circuit board, a metal shielding cover is fixedly connected to the first installation cavity, the metal shielding cover is placed in the first installation cavity and partially exposed, the circuit board is provided with a plurality of pins around the core, and the pins abut against the exposed part of the metal shielding cover.

[0007] By adopting the above technical scheme, a metal shielding cover is fixedly installed in the lower shell body, and the metal shielding cover can be installed in the first installation cavity by direct injection molding. In order to avoid the influence of the external electric field on the sensitive circuit, a metal shielding cover is used to shield the external electric field so that the interior is not affected and the electrical equipment is not affected by the outside world. The metal shielding cover is in electrostatic equilibrium in the external electric field, and the pins of the circuit board are abutted against the metal shielding cover, so that the internal field strength is always equal to zero, and the external electric field will not affect its internal space, thereby achieving the effect of shielding interference signals.

[0008] The above-mentioned air conditioning pressure sensor can be further configured as follows: the lower shell is provided with an embedded groove at the bottom of the installation cavity, the metal shielding cover is placed in the embedded groove to divide the embedded groove into an upper embedded groove and a lower embedded groove, and the upper embedded groove and the lower embedded groove are both embedded with sealing members.

[0009] By adopting the above technical solution, the metal shielding cover is placed in the embedded groove, and the metal shielding cover serves as a shield for the embedded groove through the upper embedded groove and the lower embedded groove. At the same time, a seal is installed in the upper embedded groove to enhance the sealing between the lower shell and the base, and a seal is installed in the upper embedded groove to enhance the sealing between the installation cavity and the core body. It not only prevents dust, moisture and other potential contaminants from entering the sensor, but also prevents the leakage of internal liquids such as lubricating oil, thereby extending the service life of the sensor and maintaining its performance.

[0010] The above-mentioned air-conditioning pressure sensor can be further configured as follows: a second installation cavity is opened at one end of the base, the lower shell is embedded in the second installation cavity, the circuit board includes a first circuit board and a second circuit board, the first circuit board and the second circuit board are electrically connected, a third installation cavity is opened at one end of the upper shell, the first circuit board and the second circuit board are embedded in the third installation cavity, the second circuit board is welded to the core body, a card slot is provided on one side of the third installation cavity, a card buckle is provided on one side of the first installation cavity, and the upper shell and the lower shell are connected by the card slot and the card buckle.

[0011] By adopting the above technical solution, the lower shell is embedded in the second mounting cavity of the base, and the first circuit board and the second circuit board are embedded in the third mounting cavity of the upper shell. This double embedded design greatly enhances the structural stability of the entire sensor. The electrical connection between the first circuit board and the second circuit board is protected in the embedded mounting cavity, thereby reducing the interference of the external environment on the circuit connection part, ensuring the stability of the circuit and the reliability of signal transmission. The upper shell and the lower shell are connected by means of a card slot and a buckle, which is easy to disassemble without additional tools or complicated operating steps. When the sensor needs maintenance or replacement of parts, it can be quickly disassembled and reassembled.

[0012] The above-mentioned air-conditioning pressure sensor may be further configured as follows: a plurality of fixing protrusions are arranged around the metal shielding cover, and the fixing protrusions are fixedly arranged in the first installation cavity.

[0013] By adopting the above technical solution, the several fixed protrusions arranged on the metal shielding cover are injection molded in the first installation cavity when the metal shielding cover is injection molded in the first installation cavity, thereby strengthening the connection with the plastic, preventing the metal shielding cover from rotating inside the first installation cavity and making the product more stable.

[0014] The above-mentioned air-conditioning pressure sensor may be further configured as follows: the lower shell is made of plastic, and the core is made of ceramic.

[0015] By adopting the above technical solution, the circuit board and the metal shielding cover are isolated by a plastic layer, which can withstand voltages above AC1800V and a leakage current within 0.75MA, meeting the use requirements of household appliances. Compared with other materials such as metals, ceramic materials are better in withstanding pressure and thermal expansion. In air-conditioning systems, sensors need to face constantly changing pressure and temperature environments. The ceramic core can ensure continuous operation under these conditions without losing accuracy.

[0016] The beneficial effects of the utility model are as follows: a metal shielding cover is fixedly installed in the lower shell to shield the external electric field, so that the interior is not affected and the electrical equipment does not affect the outside world; the metal shielding cover is in electrostatic equilibrium in the external electric field, and the pins of the circuit board are in contact with the metal shielding cover, so that the internal field strength is always equal to zero, and the external electric field will not affect its internal space, thereby shielding interference signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is the structural explosion diagram of the utility model;

[0019] Figure 3 It is a cross-sectional view of the lower shell of the utility model;

[0020] Figure 4 This is a schematic diagram of the upper shell structure of the utility model;

[0021] Label annotation: 1-upper shell, 2-circuit board, 3-core, 4-lower shell, 5-base, 6-first mounting cavity, 7-metal shielding cover, 8-pin, 9-embedded groove, 10-seal, 11-second mounting cavity, 12-third mounting cavity, 13-first circuit board, 14-second circuit board, 15-slot, 16-clip, 17-fixing bump, 901-upper embedded groove, 902-lower embedded groove. DETAILED DESCRIPTION

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention. Example 1

[0023] like Figure 1-2The utility model shown provides the following technical solution, an air conditioning pressure sensor, including an upper shell 1, a circuit board 2, a core 3, a lower shell 4, and a base 5. The core 3 is welded to the circuit board 2, and the core 3 and the circuit board 2 are embedded in the lower shell 4. The lower shell 4 is embedded in the base 5. The upper shell 1 is fixedly connected to the base 5. The lower shell 4 includes a first installation cavity 6 for the core 3 and the circuit board 2 to be embedded and installed. A metal shielding cover 7 is fixedly connected to the first installation cavity 6. The metal shielding cover 7 is placed in the first installation cavity 6 and partially exposed. The circuit board 2 is provided with a plurality of pins 8 around the core 3, and the pins 8 are in contact with the exposed part of the metal shielding cover 7. The metal shielding cover 7 is fixedly installed in the lower shell 4, and the metal shielding cover 7 can be installed in the first installation cavity 6 by direct injection molding. In order to avoid the influence of the external electric field on the sensitive circuit, a metal shielding cover 7 is used to shield the external electric field so that its interior is not affected and the sensor is not affected by the outside world. The metal shielding cover 7 is in a static state in the external electric field. Electrical balance, the pin 8 of the circuit board 2 is in contact with the metal shielding cover 7, so that the internal field strength is always equal to zero, and the external electric field will not affect its internal space, so as to achieve the effect of shielding interference signals. The lower shell 4 is provided with an embedded groove 9 at the bottom of the installation cavity. The metal shielding cover 7 is placed in the embedded groove 9, so that the embedded groove 9 is divided into an upper embedded groove 901 and a lower embedded groove 902. The upper embedded groove 901 and the lower embedded groove 902 are both embedded with a seal 10. The metal shielding cover 7 is placed in the embedded groove 9, and the metal shielding cover 7 is used as a shield for the embedded groove 9 through the upper embedded groove 901 and the lower embedded groove 902. At the same time, the seal 10 is installed in the upper embedded groove 901 to enhance the sealing between the lower shell 4 and the base 5. The seal 10 is installed in the upper embedded groove 901 to enhance the sealing between the installation cavity and the core body, which not only prevents dust, moisture and other potential pollutants from entering the sensor, but also prevents the leakage of internal liquids such as lubricating oil, thereby extending the service life of the sensor and maintaining its performance. Example 2

[0024] like Figure 2-4The air conditioning pressure sensor shown in the figure has a second mounting cavity 11 at one end of the base 5, the lower shell 4 is embedded in the second mounting cavity 11, the circuit board 2 includes a first circuit board 13 and a second circuit board 14, the first circuit board 13 and the second circuit board 14 are electrically connected, a third mounting cavity 12 is opened at one end of the upper shell 1, the first circuit board 13 and the second circuit board 14 are embedded in the third mounting cavity 12, the second circuit board 14 is welded to the core 3, a card slot 15 is provided on one side of the third mounting cavity 12, a card buckle 16 is provided on one side of the first mounting cavity 6, and the upper shell 1 is connected to the lower shell The upper shell 1 and the lower shell 4 are connected by the card slot 15 and the card buckle 16, the lower shell 4 is embedded in the second installation cavity 11 of the base 5, and the first circuit board 13 and the second circuit board 14 are embedded in the third installation cavity 12 of the upper shell 1. This double embedded design greatly enhances the structural stability of the entire sensor. The electrical connection between the first circuit board 13 and the second circuit board 14 is protected in the embedded installation cavity, thereby reducing the interference of the external environment on the circuit connection part, ensuring the stability of the circuit and the reliability of signal transmission. The card connection mode of the card slot 15 and the buckle 16 is convenient for disassembly without additional tools or complicated operation steps. When the sensor needs maintenance or replacement of parts, it can be quickly disassembled and reassembled. The metal shielding cover 7 is surrounded by a plurality of fixed protrusions 17, and the fixed protrusions 17 are fixedly arranged in the first installation cavity 6. The metal shielding cover 7 is provided with a plurality of fixed protrusions 17. When the metal shielding cover 7 is injection-molded and installed in the first installation cavity 6, the fixed protrusions 17 are injection-molded in the first installation cavity 6 to strengthen the connection with the plastic, so that the metal shielding cover 7 will not rotate inside the first installation cavity 6, making the product more stable. The lower shell 4 is plastic, and the core 3 is ceramic. The first circuit board 13, the second circuit board 14 and the metal shielding cover 7 are isolated by a plastic layer, which can withstand a voltage above AC1800V, and the leakage current is within 0.75MA, which can meet the use requirements of household appliances. Compared with other materials such as metals, ceramic materials are more excellent in bearing pressure and thermal expansion. In the air-conditioning system, the sensor needs to face the constantly changing pressure and temperature environment, and the ceramic core 3 can ensure continuous operation under these conditions without losing accuracy.

[0025] The beneficial effects of the utility model are as follows: the metal shielding cover 7 is fixedly installed in the lower shell 4 to shield the external electric field, so that the interior is not affected and the sensor is not affected by the outside world. The metal shielding cover 7 is in electrostatic equilibrium in the external electric field, and the pins 8 of the circuit board 2 are in contact with the metal shielding cover 7, so that the internal field strength is always equal to zero, and the external electric field will not affect its internal space, thereby shielding the interference signal.

Claims

1. An air conditioning pressure sensor, comprising an upper shell, a circuit board, a core, a lower shell, and a base, wherein the core is welded to the circuit board, the core and the circuit board are embedded in the lower shell, the lower shell is embedded in the base, and the upper shell is fixedly connected to the base, characterized in that: The lower shell includes a first installation cavity for embedding the core body and the circuit board, a metal shielding cover is fixedly connected to the first installation cavity, the metal shielding cover is placed in the first installation cavity and partially exposed, the circuit board is provided with a plurality of pins around the core body, and the pins abut against the exposed part of the metal shielding cover.

2. An air conditioning pressure sensor according to claim 1, characterized in that: The lower shell is provided with an embedded groove at the bottom of the installation cavity, and the metal shielding cover is placed in the embedded groove to divide the embedded groove into an upper embedded groove and a lower embedded groove, and the upper embedded groove and the lower embedded groove are both embedded with sealing components.

3. An air conditioning pressure sensor according to claim 2, characterized in that: A second mounting cavity is provided at one end of the base, and the lower shell is embedded in the second mounting cavity. The circuit board includes a first circuit board and a second circuit board, and the first circuit board and the second circuit board are electrically connected. A third mounting cavity is provided at one end of the upper shell, and the first circuit board and the second circuit board are embedded in the third mounting cavity. The second circuit board is welded to the core body, a card slot is provided on one side of the third mounting cavity, and a buckle is provided on one side of the first mounting cavity. The upper shell and the lower shell are connected by the card slot and the buckle.

4. The air conditioning pressure sensor according to claim 3, characterized in that: The metal shielding cover is surrounded by a plurality of fixing protrusions, and the fixing protrusions are fixedly arranged in the first installation cavity.

5. The air conditioning pressure sensor according to claim 1, characterized in that: The lower shell is made of plastic, and the core is made of ceramic.

Images