Pressure sensor without FPC (Flexible Printed Circuit) wire connection

Abstract

The utility model provides a pressure sensor without FPC (Flexible Printed Circuit) wire connection, which comprises a screwed joint and an injection molding joint which are arranged on the upper side and the lower side of a sensor shell and can be conveniently connected with other equipment, a connecting mechanism is arranged in a mounting groove, and a second sealing ring with a certain buffering function is sleeved on the connecting mechanism. A first sealing ring is placed at the position, close to the threaded connector, of the mounting groove, deformation can be generated due to small deformation of the connecting mechanism, and the first sealing ring and the second sealing ring on the connecting mechanism can buffer the ceramic resistor and guarantee the air tightness of the mounting groove. A connector is arranged below the connecting mechanism, a sensor module is connected above the connector, and a ceramic material of the sensor module can keep stable physical and chemical properties in a high-temperature environment, so that the sensor can normally work in the high-temperature environment, and has an anti-aging characteristic due to the fact that the sensor does not change due to temperature.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure sensors, in particular to a pressure sensor without FPC line connection. Background Art

[0002] In order to adapt to the development of the refrigeration industry, many refrigeration companies have adopted frequency conversion technology. In order to solve the problem of frequency conversion technology, an electronic signal pressure protection controller is needed. This pressure sensor converts the mechanical signal of pressure into an electronic signal such as voltage or current. The electronic signal is transmitted to the electronic equipment, and then the pressure value is displayed on the computer. Most of the pressure sensors currently used use FPC lines to realize signal connection. In actual processing, the FPC lines need to be welded to the thick film resistors and connectors respectively to realize the connection between the thick film resistors and the connectors.

[0003] However, the welding process itself will complicate the assembly process and affect the overall assembly progress of the pressure sensor. The firmness of the welding process directly affects the service life of the FPC line. Once a cold weld or loose welding occurs during the welding process, the FPC line as the signal connection party cannot achieve effective signal transmission function, thus affecting the service life of the pressure sensor. On the other hand, the FPC line will also age during use due to the high temperature caused by the use of some high-temperature working environments. The aging of the FPC line will also affect the overall service life of the pressure sensor. Utility Model Content

[0004] The technical content of the utility model is to provide a pressure sensor without FPC line connection.

[0005] In order to solve the above problems, the utility model provides a pressure sensor without FPC line connection, including: threaded joints and injection molded joints installed on the upper and lower sides of the sensor housing for convenient connection with other equipment, an installation groove is opened on the inner wall of one side of the sensor housing close to the threaded joint, a connecting mechanism is installed inside the installation groove, a second sealing ring with a certain buffering effect is sleeved on the connecting mechanism, a first sealing ring is placed in the installation groove near the threaded joint, a connector is arranged below the connecting mechanism, and a sensor module is connected above the connector, and the connecting mechanism and the connector are electrically connected through the sensor module.

[0006] As a further solution of the present invention, the outer side of the threaded joint is evenly covered with threads, and the inner cavity of the threaded joint is communicated with the installation groove.

[0007] As a further solution of the present invention, a first sealing ring is placed at the position where the inner cavity of the threaded joint is connected to the mounting groove, and a circular groove matching the first sealing ring is opened on the mounting groove. The first sealing ring and the connecting mechanism cooperate to seal the mounting groove to ensure the air tightness of the device.

[0008] As a further solution of the present invention, the connecting mechanism includes a ceramic base and a ceramic resistor, and the ceramic base is a circular ring-shaped convex structure.

[0009] As a further solution of the present invention, a groove matching with the second sealing ring is formed on the outer side of the ceramic base.

[0010] As a further solution of the present invention, the ceramic resistor is a square structure, and a groove matching the ceramic resistor is provided on the top of the ceramic base.

[0011] As a further solution of the present invention, the sensor module is an octagonal structure and is in contact with the bottom of the ceramic resistor. The bottom of the ceramic base is provided with a groove that matches the sensor module, and the circuit board of the sensor module is composed of a ceramic sheet, so that the sensor module has better high temperature resistance.

[0012] As a further solution of the present invention, the connector is a T-shaped structure, a groove matching with the sensor module is provided on the top of the connector, and the sensor module is electrically connected on the top of the connector.

[0013] In summary, the utility model includes at least one of the following beneficial technical effects:

[0014] First, the utility model records a pressure sensor without FPC line connection. It records that by setting a connection mechanism in the installation groove, when displacement or vibration occurs, the ceramic base will limit the ceramic resistor and the sensor module, and has more than ten times the ability to resist destructive overload, and a first sealing ring and a second sealing ring are set on the connection mechanism. The sealing ring can protect the sensor from direct influence of the external environment, especially to prevent moisture, dust and other substances that may cause damage from entering the sensor. This is crucial to ensure the long-term stability of the sensor and reduce maintenance costs. The sensor may be subject to unexpected impact or vibration, and the sealing ring can play a certain buffering role, thereby improving the durability and reliability of the sensor.

[0015] Second, the utility model records a pressure sensor without FPC line connection, which records that by using ceramic sheets as the circuit board base of the sensor module, the ceramic material has better high temperature resistance, better insulation performance and more solid welding performance with electronic components. The ceramic material can maintain stable physical and chemical properties in a high temperature environment, and will not deform or degrade at high temperatures like some other materials, so that the sensor can work normally in a high temperature environment, and the measurement accuracy will not be affected by temperature changes while having aging resistance. At the same time, the thermal expansion coefficient of the ceramic material is relatively low, which means that when the temperature changes, the size changes little, which helps to maintain the accuracy and long-term stability of the sensor. The ceramic material has good electrical insulation, which is very important for electrical components in the sensor, especially in a high temperature environment. Good electrical insulation can prevent unnecessary electrical failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the pressure sensor without FPC line connection of the utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the sensor housing structure of the utility model of the pressure sensor without FPC line connection;

[0019] Figure 3 This is a schematic diagram of the overall structure of the pressure sensor without FPC line connection of the utility model;

[0020] Figure 4 It is a cross-sectional schematic diagram of the connection mechanism of the pressure sensor connected without FPC line and the second sealing ring structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the connection mechanism of the pressure sensor without FPC line connection of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the connector and sensor module of the pressure sensor connected without FPC line in the utility model.

[0023] Figure numerals: 1. sensor housing; 2. threaded joint; 3. injection molding joint; 4. mounting groove; 5. first sealing ring; 6. connecting mechanism; 61. ceramic base; 62. ceramic resistor; 7. second sealing ring; 8. connector; 9. sensor module. DETAILED DESCRIPTION

[0024] Please refer to Figure 1-6The pressure sensor without FPC line connection includes: a threaded joint 2 and an injection molded joint 3 installed on the upper and lower sides of the sensor housing 1 for convenient connection with other devices, a mounting groove 4 is provided on the inner wall of the sensor housing 1 near the threaded joint 2, a connecting mechanism 6 is installed inside the mounting groove 4, a second sealing ring 7 with a certain buffering effect is sleeved on the connecting mechanism 6, a first sealing ring 5 is placed near the threaded joint 2 in the mounting groove 4, a connector 8 is provided below the connecting mechanism 6, and a sensor module 9 is connected above the connector 8, and the connecting mechanism 6 and the connector 8 are electrically connected through the sensor module 9.

[0025] Preferably, the outer side of the threaded joint 2 is evenly covered with threads, and the inner cavity of the threaded joint 2 is communicated with the mounting groove 4. A first sealing ring 5 is placed at the portion where the inner cavity of the threaded joint 2 is connected to the mounting groove 4, and a circular groove matching the first sealing ring 5 is provided on the mounting groove 4. The connecting mechanism 6 includes a ceramic base 61 and a ceramic resistor 62. The ceramic base 61 is a circular convex structure, and a groove matching the second sealing ring 7 is provided on the outer side of the ceramic base 61. The ceramic resistor 62 is a square structure, and a groove matching the ceramic resistor 62 is provided on the top of the ceramic base 61. The first sealing ring 5 is in contact between the mounting groove 4 and the ceramic resistor 62 to fix and buffer the ceramic resistor 62. , to prevent the ceramic resistor 62 from being damaged and worn due to vibration. At the same time, the groove on the ceramic base 61 has a fixing effect on the second sealing ring 7. The second sealing ring 7 is sleeved on the ceramic base 61 and contacts the mounting groove 4 to achieve a sealing effect. When in use, the threaded connector 2 is threadedly connected to the device to be tested, and the signal is transmitted downward through the connecting mechanism 6. The pressure acts on the connecting mechanism 6 to produce a slight deformation. The ceramic resistor 62 generates a voltage signal proportional to the pressure through the Wheatstone bridge. Due to the slight deformation of the connecting mechanism 6, it will cause deformation, and the first sealing ring 5 and the second sealing ring 7 on the connecting mechanism 6 will buffer the ceramic resistor 62 and ensure the airtightness of the mounting groove 4.

[0026] Preferably, the sensor module 9 is an octagonal structure and is in contact with the bottom of the ceramic resistor 62. A groove matching the sensor module 9 is provided at the bottom of the ceramic base 61, and the circuit board base of the sensor module 9 is composed of a ceramic sheet. The connector 8 is a T-shaped structure, and the connector 8 is a T-shaped structure with a groove matching the sensor module 9 provided above. The sensor module 9 is electrically connected above the connector 8. The sensor module 9 is in contact with the ceramic resistor 62 above and is stuck at the bottom of the ceramic base 61, so that the sensor module 9 will not be offset due to vibration during operation, making it impossible to achieve effective signal transmission function, and the ceramic material of the sensor module 9 can maintain stable physical and chemical properties in a high temperature environment, and will not deform or degrade at high temperature like some other materials, so that the sensor can work normally in a high temperature environment, will not be affected by temperature changes. The measurement accuracy is also resistant to aging.

[0027] The working principle of the pressure sensor without FPC line connection provided by the utility model is as follows:

[0028] Understand the working principle of the pressure sensor, that is, the pressure acts on the connecting mechanism 6 to produce a small deformation, and the ceramic resistor 62 generates a voltage signal proportional to the pressure through the Wheatstone bridge.

[0029] Thread the threaded connector 2 onto the pressure source of the device to be tested, ensure that the power supply voltage of the pressure sensor is within the range of 5 to 30 VDC to meet its normal power supply requirements, ensure that it can accurately detect pressure changes, supply the sensor with rated excitation power, and ensure sufficient stabilization time for accurate measurement. During the pressure measurement process, the connecting mechanism 6 will deform due to slight deformation, and the first sealing ring 5 and the second sealing ring 7 on the connecting mechanism 6 will buffer the ceramic resistor 62 and ensure the airtightness of the mounting groove 4.

[0030] Connect a test instrument with an input impedance greater than the sensor load impedance to read and record data. Determine the calibration points based on the measuring range, including at least the zero point and the full-scale point. Perform positive and reverse stroke calibration and record the data at each calibration point. Check the excitation voltage during the measurement process to ensure its stability to ensure the stability of the sensor output signal.

[0031] Record data at each calibration point, including forward and reverse stroke readings, to evaluate the performance of the sensor. Static calibration requires at least three consecutive cycles to ensure data consistency and reliability. Monitor the performance of the sensor regularly during use and perform necessary maintenance to ensure long-term stable operation.

[0032] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations or direct or indirect applications may be made to these embodiments without departing from the principles and spirit of the present invention. In other related technical fields, the scope of the present invention is defined by the attached claims and their equivalents, which are equally included in the scope of patent protection of the present invention.

Claims

1. No FPC line connected to the pressure sensor, including: A threaded joint (2) and an injection molded joint (3) are mounted on the upper and lower sides of a sensor housing (1) to facilitate connection with other equipment, characterized in that: a mounting groove (4) is provided on the inner wall of the sensor housing (1) near the threaded joint (2), a connecting mechanism (6) is mounted inside the mounting groove (4), a second sealing ring (7) with a certain buffering effect is sleeved on the connecting mechanism (6), a first sealing ring (5) is placed in the mounting groove (4) near the threaded joint (2), a connector (8) is arranged below the connecting mechanism (6), a sensor module (9) is connected above the connector (8), and the connecting mechanism (6) and the connector (8) are electrically connected through the sensor module (9); The connecting mechanism (6) comprises a ceramic base (61), wherein the ceramic base (61) is installed in the installation groove (4).

2. The pressure sensor without FPC line connection according to claim 1, characterized in that: The outer side of the threaded joint (2) is evenly covered with threads, and the inner cavity of the threaded joint (2) is in communication with the installation groove (4).

3. The pressure sensor without FPC line connection according to claim 2, characterized in that: A first sealing ring (5) is placed at the portion where the inner cavity of the threaded joint (2) is connected to the mounting groove (4), and a circular groove matching the first sealing ring (5) is provided on the mounting groove (4).

4. The pressure sensor without FPC line connection according to claim 1, characterized in that: The connecting mechanism (6) comprises a ceramic base (61) and a ceramic resistor (62); the ceramic base (61) is a circular convex structure.

5. The pressure sensor without FPC line connection according to claim 4, characterized in that: The outer side of the ceramic base (61) is provided with a groove which matches the second sealing ring (7).

6. The pressure sensor without FPC line connection according to claim 5, characterized in that: The ceramic resistor (62) is of a square structure, and a groove matching the ceramic resistor (62) is provided on the top of the ceramic base (61).

7. The pressure sensor without FPC line connection according to claim 1, characterized in that: The sensor module (9) is of an octagonal structure and is in contact with the bottom of the ceramic resistor (62); a groove matching the sensor module (9) is provided at the bottom of the ceramic base (61); and the circuit board of the sensor module (9) is composed of a ceramic sheet.

8. The pressure sensor without FPC line connection according to claim 1, characterized in that: The connector (8) is a T-shaped structure, a groove matching the sensor module (9) is provided on the top of the connector (8), and the sensor module (9) is electrically connected to the top of the connector (8).

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