Three-wire system temperature and liquid integrated switch

Abstract

The utility model discloses a three-wire system temperature and liquid integrated switch, which comprises a shell, a connecting piece and a probe rod, the connecting piece is fixedly arranged at the lower end of the shell, the probe rod is fixedly arranged at the lower end of the connecting piece, and a wiring module and a control module are arranged in the shell. A magnetic liquid level detection device and a temperature detection device are correspondingly arranged in the probe rod, the probe rod is slidably sleeved with a floating ball part, a permanent magnet is fixedly arranged in the floating ball part, and a limiting part is arranged at the lower end of the probe rod. According to the utility model, the structure of the connecting rod floating ball is improved, and the magnetic system and the temperature sensing resistor are matched, so that the liquid level height and the temperature can be detected synchronously, the whole device is convenient to disassemble, assemble and use, and the accuracy is higher.

Description

Technical Field

[0001] The utility model relates to the technical field related to a measurement system for measuring liquid level and temperature using resistance, and in particular to a three-wire temperature-liquid integrated switch. Background Art

[0002] With the rapid development of science and technology, high-tech applications are becoming increasingly widespread across various industries. High-tech magnetostrictive level gauge sensors are used in various liquid level measurements. These level gauges feature high accuracy, strong environmental adaptability, and easy installation. Therefore, they are widely used in the petroleum, chemical, and other liquid level measurement fields, gradually replacing other traditional sensors and becoming a top-notch level measurement tool. Liquid storage tanks in CNPC, Sinopec, and various industrial settings often require manual measurement of the liquid within the tanks. This involves using a metric steel tape measure with a weight or a graduated ruler, manually recording the readings, and manually looking up tables for conversion to obtain the final oil volume data. This measurement method is not only labor-intensive but also unsafe and lacks accuracy. Some areas use capacitive or diffused silicon pressure level gauges, but these sensors are unpopular due to their severe zero drift, large measurement deviation, and poor long-term stability. Other areas use isobaric diaphragm level gauges or mechanical float level gauges, but these are not widely used because diaphragm level gauges are significantly affected by temperature and suffer from air leakage, while mechanical float level gauges often experience steel strip jamming. Most importantly, these types of level gauges are expensive. Linked rod float switches are relatively inexpensive, cost-effective, and require no power supply.

[0003] Because the liquid level measurement function of the existing technology is single and cannot detect the liquid level and temperature at the same time, it requires two devices to operate simultaneously, which is inconvenient to operate and high cost. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a three-wire temperature-liquid integrated switch.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A three-wire temperature-liquid integrated switch, comprising a housing, a connector, and a probe, wherein the connector is fixedly disposed at the lower end of the housing, the probe is fixedly disposed at the lower end of the connector, and a wiring module and a control module are disposed within the housing;

[0007] A magnetic liquid level detection device and a temperature detection device are arranged in the probe rod, and the magnetic liquid level detection device and the temperature detection device are arranged on a common carrier in the probe rod.

[0008] Preferably, a threaded structure is provided at the lower end of the connecting piece and a flange structure is provided on the fixing sleeve of the connecting piece.

[0009] Preferably, the magnetic liquid level detection device and the temperature detection device are arranged on a common carrier in the probe rod, including:

[0010] The magnetic liquid level detection device is arranged on a circuit board inside the probe rod;

[0011] The temperature detection device is fixed on the circuit board in the probe rod by adhesive tape.

[0012] Preferably, the circuit board in the probe rod further includes resistor components respectively adapted to the specifications of the magnetic liquid level detection device and the temperature detection device.

[0013] Preferably, glue is poured into the probe rod to fix the magnetic liquid level detection device, the temperature detection device and the circuit board.

[0014] Preferably, the magnetic liquid level detection device adopts a reed switch structure.

[0015] Preferably, the temperature detection device adopts a three-wire PT1000.

[0016] Preferably, a floating ball is provided on the sliding sleeve of the probe rod, a permanent magnet is fixedly provided inside the floating ball, and a limiting member is provided at the lower end of the probe rod.

[0017] Preferably, the limiting member comprises a limiting sleeve sleeved on the lower end of the probe rod, a limiting bolt is threadedly provided on the limiting sleeve, and a limiting hole groove matching the limiting bolt is provided on the probe rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting up a structure similar to a connecting rod float liquid level switch, the float is made to float up and down within a certain range, and the magnetic system in the float is used to influence the internal reed switch to achieve the purpose of measuring the liquid level. The main measurement method is through collecting the output resistance of the connecting wire. This detection principle is basically unaffected when there is no magnetism in the outside world; at the same time, when the temperature changes, the current liquid level height and ambient temperature can be judged by the output resistance. The structure is simple, with high accuracy, convenient to use and good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the utility model;

[0021] Figure 3 This is a circuit diagram of the utility model.

[0022] In the picture:

[0023] 1. Shell, 2. Connecting piece, 3. Probe rod, 4. Magnetic liquid level detection device, 5. Temperature detection device, 6. Float, 7. Limit sleeve, 8. Limit bolt. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1-2 A three-wire temperature-liquid integrated switch is shown, comprising:

[0026] As the main body, the shell 1, the connecting member 2 and the probe rod 3, the connecting member 2 is fixedly arranged at the lower end of the shell 1, the probe rod 3 is fixedly arranged at the lower end of the connecting member 2, and the shell 1 is provided with a wiring module and a control module. The above structure is similar to the existing connecting rod float liquid level switch structure. In order to realize the detection function, further, a magnetic liquid level detection device 4 and a temperature detection device 5 are arranged in the probe rod 3. The magnetic liquid level detection device 4 and the temperature detection device 5 are arranged on a common carrier in the probe rod;

[0027] Specifically, the magnetic liquid level detection device 4 and the temperature detection device 5 are arranged on a common carrier in the probe rod, including: the magnetic liquid level detection device 4 is set on the circuit board in the probe rod; the temperature detection device 5 is fixed to the circuit board in the probe rod by tape.

[0028] The circuit board inside the probe rod also includes resistor devices that are respectively adapted to the specifications of the magnetic liquid level detection device 4 and the temperature detection device 5, using existing technology; the magnetic liquid level detection device 4, the temperature detection device 5 and the circuit board are fixed with glue in the probe rod 3 to ensure the stability of the sound field and the overall structure.

[0029] Among them, the magnetic liquid level detection device 4 adopts a reed switch structure, the temperature detection device 5 adopts a three-wire PT1000, and a number of resistors are connected in series on the magnetic liquid level detection device 4 and the temperature detection device 5. Specifically, according to the magnetism of the float, the number of reed switches affected by the float part 6 is set to about 5; no power supply is required during operation. Based on the working principle of the reed switch, when the float moves, the attached reed switch will be turned on, and the resistance value will change. The current liquid level height is read according to the size of the resistance value. PT1000 also obtains the current environmental temperature based on the read resistance value.

[0030] At the same time, a floating ball part 6 is provided on the sliding sleeve of the probe rod 3, and a permanent magnet is fixed inside the floating ball part 6. A limiting part is provided at the lower end of the probe rod 3. In some embodiments, the limiting part includes a limiting sleeve 7 sleeved on the lower end of the probe rod 3, and a limiting bolt 8 is threaded through the limiting sleeve 7. A limiting hole groove matching the limiting bolt 8 is provided on the probe rod 3, which can facilitate disassembly and replacement of the floating ball part 6; in order to further facilitate the installation and fixation of the overall device, a threaded structure is provided at the lower end of the connecting member 2 and a flange structure is provided on the fixed sleeve of the connecting member 2.

[0031] connect Figure 2 The 2-wire and 3-wire shown can be used to test the current liquid level. When the float is at the bottom, it affects the five reed switches at the bottom, and the resistance is 8K. When the float is at the top, the top reed switch is turned on, and the resistance is 2K. Therefore, the resistance range is 2K-8K, and each 200 ohm resistance is one scale.

[0032] connect Figure 2 In the case of 1-wire and 3-wire as shown, the resistance between 1-wire and 3-wire is between 7.8K and 8.2K due to the influence range of the reed switch.

[0033] The internal approximate circuit of the three-wire PT1000 is as follows Figure 3 As shown, R△ changes resistance depending on temperature. Ra, Rb, and Rc are the wire resistances, which are not significantly affected by temperature. Wires 4, 5, and 6 are connected to the outside world, and different temperatures are detected based on their resistance values.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-wire temperature-liquid integrated switch, characterized in that: It comprises a housing (1), a connecting piece (2) and a probe (3), wherein the connecting piece (2) is fixedly arranged at the lower end of the housing (1), the probe (3) is fixedly arranged at the lower end of the connecting piece (2), and a wiring module and a control module are arranged in the housing (1); A magnetic liquid level detection device (4) and a temperature detection device (5) are arranged in the probe rod (3); the magnetic liquid level detection device (4) and the temperature detection device (5) are arranged on a common carrier in the probe rod.

2. A three-wire temperature-liquid integrated switch according to claim 1, characterized in that: The lower end of the connecting piece (2) is provided with a threaded structure, and the fixing sleeve on the connecting piece (2) is provided with a flange structure.

3. The three-wire temperature-liquid integrated switch according to claim 1, characterized in that: The magnetic liquid level detection device (4) and the temperature detection device (5) are arranged on a common carrier inside the probe rod and include: The magnetic liquid level detection device (4) is arranged on a circuit board inside the probe rod; The temperature detection device (5) is fixed to the circuit board inside the probe rod by adhesive tape.

4. The three-wire temperature-liquid integrated switch according to claim 1, characterized in that: The circuit board in the probe rod also includes resistance components that are respectively adapted to the specifications of the magnetic liquid level detection device (4) and the temperature detection device (5).

5. The three-wire temperature-liquid integrated switch according to claim 3, characterized in that: The probe rod (3) is filled with glue to fix the magnetic liquid level detection device (4), the temperature detection device (5) and the circuit board.

6. The three-wire temperature-liquid integrated switch according to claim 3, characterized in that: The magnetic liquid level detection device (4) adopts a reed switch structure.

7. The three-wire temperature-liquid integrated switch according to claim 3, characterized in that: The temperature detection device (5) adopts a three-wire PT1000.

8. The three-wire temperature-liquid integrated switch according to claim 1, characterized in that: A floating ball component (6) is provided on the sliding sleeve of the probe rod (3), a permanent magnet is fixedly provided inside the floating ball component (6), and a limiting component is provided at the lower end of the probe rod (3).

9. The three-wire temperature-liquid integrated switch according to claim 8, characterized in that: The limiting member comprises a limiting sleeve (7) sleeved on the lower end of the probe rod (3); a limiting bolt (8) is threadedly provided on the limiting sleeve (7); and a limiting hole groove matching the limiting bolt (8) is provided on the probe rod (3).

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