Temperature compensation type liquid level transmitter

Abstract

A temperature compensation type liquid level transmitter comprises a base body box, a wiring board is arranged in an inner cavity of the base body box, a digital display meter is arranged on the surface of the base body box, two detection parts are connected to the base body box, the detection parts are connected with the wiring board, each detection part comprises a detection cylinder, a detection cavity is formed in each detection cylinder, and the detection cylinders are connected with the digital display meter. A circuit board is arranged in the detection cavity; pressure and temperature of corresponding positions are respectively measured through the capacitive core and the temperature sensor, the liquid level in the container at the moment is calculated through the pressure and the temperature, the influence of temperature change in the container on liquid level height calculation can be reduced through the device, the accuracy of calculating the liquid level height through the pressure is further improved, and the accuracy of measuring the liquid level height is improved. And the measurement result is more accurate, and the error is smaller.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sensor especially a temperature compensation type liquid level transmitter. BACKGROUND

[0002] The liquid level sensor is a sensor for detecting the liquid level height in a container, and is widely used in occasions such as fermentation tanks, fine chemical storage tanks and the like where the liquid level height in the container needs to be monitored. The capacitive liquid level sensor is one of the mainstream forms in the field of liquid level detection, and is a liquid level sensor that converts the liquid level between capacitor plates into capacitance, and then calculates the liquid level height based on the linear relationship between capacitance and liquid level.

[0003] At present, the measurement accuracy of the liquid level sensor is generally low, because the measurement accuracy of the liquid level sensor is mainly affected by temperature. In view of this situation, it is necessary to provide a liquid level sensor that can eliminate the influence of environmental factors such as temperature changes and realize high-reliability liquid level height measurement. SUMMARY

[0004] The utility model discloses a temperature compensation type liquid level transmitter to solve the problem raised in the above background technology.

[0005] The utility model solves its technical problem and is implemented by the following technical scheme:

[0006] A temperature compensation type liquid level transmitter, comprising a base box, a wiring board is arranged in the inner cavity of the base box, a digital display meter is arranged on the surface of the base box, two detection parts are connected to the base box, the detection parts are connected to the wiring board, the detection part comprises a detection cylinder, a detection cavity is arranged in the detection cylinder, a circuit board is arranged in the detection cavity, a capacitive core is fixedly arranged at the bottom of the detection cavity, the capacitive core is connected to the circuit board, a sanitary chuck is arranged at the lower end of the detection cylinder, a T-shaped cavity is communicated with the lower side of the detection cavity, the top end of the T-shaped cavity is in contact with one end of the detection surface of the capacitive core, silicon oil is filled in the inner cavity of the T-shaped cavity, the other end of the T-shaped cavity is communicated with the outer side of the bottom of the sanitary chuck, a diaphragm is fixedly arranged at the bottom of the sanitary chuck, the silicon oil in the T-shaped cavity is sealed in the T-shaped cavity by the diaphragm, a temperature sensor is arranged in the wall of the detection cylinder beside the T-shaped cavity, the temperature sensor is connected to the circuit board, and the circuit board is connected to the wiring board through a wire.

[0007] Preferably, mounting holes are symmetrically arranged on the left and right outer sidewalls of the base box, and the base box can be fixed at a specified position by screws.

[0008] Preferably, a sheath is arranged at the connection between the detection cylinder and the wire.

[0009] As preferred, the base box is further provided with a power supply port and an output port.

[0010] As preferred, the temperature sensor is a thermal resistance.

[0011] The utility model discloses the advantages and positive effects are:

[0012] 1. The utility model discloses a capacitor type core body and temperature sensor two respectively measure the pressure and temperature of corresponding position, calculate the liquid level in the container through pressure and temperature, through this equipment can reduce the influence of temperature change in the container to the calculation liquid level height, and then increase the accuracy of pressure calculation liquid level height, make the measurement result more accurate, and the error is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further described below in connection with the drawings and examples.

[0014] Figure 1 It is the main view structural schematic diagram of the utility model of a temperature compensation type liquid level transmitter whole;

[0015] Figure 2 It is the utility model Figure 1 The enlarged structural schematic diagram of A place in it;

[0016] Figure 3 It is the utility model Figure 1 The structural schematic diagram of B-B place in it.

[0017] The marks in the drawings are described as follows: 10, base box; 11, detection part; 12, wire; 13, sheath; 14, detection cylinder; 15, circuit board; 16, capacitor type core body; 17, T-shaped cavity; 18, diaphragm; 19, temperature sensor; 20, digital display meter; 21, mounting hole; 22, power supply port; 23, output port; 24, wiring board; 25, detection cavity; 26, sanitary chuck. DETAILED DESCRIPTION

[0018] The utility model will be further described below in connection with the drawings and examples.

[0019] The utility model will be further described below in connection with the drawings and examples. Figures 1-3 The utility model will be further described below in connection with the drawings and examples, wherein, for the convenience of narration, now the direction of the following said is defined as follows: the up-down and left-right and front-back direction of the following said is identical with the up-down and left-right and front-back direction of the view direction, Figure 1 The direction shown in the view direction is identical with the up-down and left-right and front-back direction of the view direction of the utility model device, Figure 1 It is the front view of the utility model device, Figure 1 The direction shown in the view direction is identical with the up-down and left-right and front-back direction of the view direction of the utility model device.

[0020] The utility model embodiment is further described in detail below with reference to the drawings:

[0021] Please refer to Figures 1-3 An embodiment provided by the utility model: a temperature compensation type liquid level transmitter, including base box 10, the base box 10 inner chamber is equipped with terminal block 24, the base box 10 surface is equipped with digital display table 20, two detection parts 11 are connected on the base box 10, the detection part 11 is connected with the terminal block 24, the detection part 11 includes detection cylinder 14, the detection cylinder 14 inside is equipped with detection cavity 25, the detection cavity 25 is equipped with circuit board 15, the detection cavity 25 bottom is fixedly provided with capacitive core 16, the capacitive core 16 is connected with the circuit board 15, the detection cylinder 14 lower end is equipped with sanitary chuck 26, the detection cavity 25 lower side is communicated and is equipped with T-shaped cavity 17, the T-shaped cavity 17 top end is in contact with one end of the capacitive core 16 detection surface, the T-shaped cavity 17 inner chamber is filled with silicone oil, the other end of the T-shaped cavity 17 is communicated with the detection cylinder sanitary chuck 26 bottom outer side, the sanitary chuck 26 bottom is fixedly provided with diaphragm 18. The diaphragm 18 seals the silicone oil in the T-shaped cavity 17 inside the T-shaped cavity 17, the detection cylinder 14 wall body in the T-shaped cavity 17 side is equipped with temperature sensor 19, the temperature sensor 19 is connected with the circuit board 15, the circuit board 15 is connected with the terminal block 24 through wire 12.

[0022] In addition, in an embodiment, the base box 10 outer side wall is symmetrically provided with mounting hole 21, and the base box 10 can be fixed at a specified position by screws.

[0023] In addition, in an embodiment, the detection cylinder 14 is provided with a sheath 13 at the connection with the wire 12.

[0024] In addition, in an embodiment, the base box 10 is further provided with a power supply port 22 and an output port 23.

[0025] In addition, in an embodiment, the temperature sensor 19 is a thermal resistance.

[0026] In specific implementation, the two detection parts 11 are respectively installed at positions close to upper ends and lower ends of the containers to be detected, the sanitary chuck is fixedly connected with the detection ports of the upper ends and the lower ends of the containers through the clamps, a pressure is applied to the diaphragm 18 through the fluids above and below in the containers, the diaphragm 18 extrudes the silicone oil in the T-shaped cavity 17, the silicone oil extrudes the detection surface of the capacitive core body 16, so that the pressure of the corresponding position is detected, meanwhile, the temperature of the corresponding position is measured through the temperature sensor 19, the pressure signal and the temperature signal are transmitted to the circuit board 15, the pressure signal and the temperature signal are comprehensively processed and analyzed, the liquid level in the container is calculated, then the liquid level is displayed through the digital display meter 20, the pressure and the temperature of the corresponding positions are respectively measured through the capacitive core body 16 and the temperature sensor 19, the liquid level in the container at this time is calculated through the pressure and the temperature, the influence of the temperature change in the container on the calculation of the liquid level is reduced, the accuracy of the pressure calculation of the liquid level is further increased, the measurement result is more accurate, and the error is smaller.

[0027] It should be emphasized that the embodiments of the utility model are illustrative rather than restrictive, and thus the utility model is not limited to the embodiments described in the specific embodiments, and any other embodiments derived by those skilled in the art according to the technical scheme of the utility model also belong to the protection scope of the utility model.

Claims

1. A temperature-compensated liquid level transmitter comprising a base box (10), characterized in that: The inner cavity of the base box (10) is provided with a wiring board (24), the surface of the base box (10) is provided with a digital display table (20), two detection parts (11) are connected to the base box (10), the detection part (11) is connected with the wiring board (24), the detection part (11) comprises a detection cylinder (14), the detection cylinder (14) is internally provided with a detection cavity (25), the detection cavity (25) is provided with a circuit board (15), the bottom of the detection cavity (25) is fixedly provided with a capacitive core (16), the capacitive core (16) is connected with the circuit board (15), the lower end of the detection cylinder (14) is provided with a sanitary chuck (26), the lower side of the detection cavity (25) is communicated with a T-shaped cavity (17), the top end of the T-shaped cavity (17) is in contact with one end of the detection surface of the capacitive core (16), the inner cavity of the T-shaped cavity (17) is filled with silicone oil, the other end of the T-shaped cavity (17) is communicated with the bottom outer side of the sanitary chuck (26), the bottom of the sanitary chuck (26) is fixedly provided with a diaphragm (18). The diaphragm (18) seals the silicone oil in the T-shaped cavity (17) in the T-shaped cavity (17), the temperature sensor (19) is arranged in the wall of the detection cylinder (14) beside the T-shaped cavity (17), the temperature sensor (19) is connected with the circuit board (15), and the circuit board (15) is connected with the wiring board (24) through the lead wire (12).

2. A temperature-compensated liquid level transmitter according to claim 1, characterized in that: The left and right outer sidewalls of the base box (10) are symmetrically provided with mounting holes (21), and the base box (10) can be fixed at a specified position by screws.

3. A temperature-compensated liquid level transmitter according to claim 1, characterized in that: The detection cylinder (14) is provided with a sheath (13) at the connection position of the lead wire (12).

4. A temperature-compensated liquid level transmitter as defined in claim 1, wherein: The outer part of the base box (10) is further provided with a power supply port (22) and an output port (23).

5. A temperature-compensated liquid level transmitter as recited in claim 1, wherein: The temperature sensor (19) is a thermal resistance.

Images