Connecting rod floating ball liquid level switch

Abstract

The connecting rod floating ball liquid level switch comprises a shell, a connecting piece and a probe rod, an opening is formed in the lower side of the shell, the connecting piece correspondingly seals the opening and is fixedly connected with the shell through a flange, and a threaded insertion opening matched with the probe rod is formed in the lower end of the connecting piece. The probe rod is hollow, the probe rod, the connecting piece and the shell are communicated with one another, a junction box is fixedly arranged on the shell in a penetrating mode, the probe rod is sleeved with a floating ball piece in a sliding mode, a plurality of reed pipes are arranged in the probe rod, and a permanent magnet is fixedly arranged in the floating ball piece. Limiting detection of liquid can be carried out in the tank body, and the industrial application requirement is met; in the limiting detection mode, the liquid reaches the detected height, switching action is generated, and multiple functions such as overflow protection can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field related to liquid level control, in particular to a connecting rod float liquid level switch. Background Art

[0002] The GF series float level switch is suitable for liquid level control and alarming in various open or closed containers in the petroleum, chemical, textile printing and dyeing, and civil construction industries. The instrument features a simple structure, easy installation, and low price, making it suitable for liquid level control of various media. It uses multiple floats to independently control multiple control points, making operation more reliable. It is a liquid level control device commonly used in electronics, electricity, chemicals, water treatment, water supply and drainage, and other fields. This device is explosion-proof and corrosion-resistant, making it suitable for liquid level monitoring and control in flammable and explosive environments. The development of the connecting rod float can be traced back to the increasing demand for safe production. Over the past few decades, the petrochemical industry has experienced numerous major accidents, some of which were related to improper liquid level control. To ensure the safety and stability of production processes, people began to seek a float that could be used in hazardous environments.

[0003] The connecting rod float level switch is a custom product. For user convenience, a table detailing the float specifications, material properties, junction box specifications, connection specifications, and related component specifications is compiled to facilitate accurate model selection. Select the appropriate float based on the measured liquid's operating temperature, pressure, specific gravity, acid and alkali resistance, and explosion-proof properties. When purchasing, consider the connection specifications, the location of each actuating point, the operating mode (normally open or normally closed), and the overall length to ensure accuracy in harsh operating environments. This device plays a vital role in the electronics, power, chemical, water treatment, and water supply and drainage industries, providing reliable assurance for safe production process control.

[0004] With the diversification of user on-site needs, the existing connecting rod float is limited in application. Usually, one product is difficult to adapt to the needs of multiple scenarios. Sometimes multiple products have to be designed to suit different scenarios, making it difficult for the products to flexibly adapt to market needs and increasing production costs. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a connecting rod float liquid level switch.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The probe rod of the connecting rod float liquid level switch is hollow and has a plurality of reed switches inside. Adjacent reed switches are connected by fixing members. The reed switches send on / off signals to an external controller through signal lines at both ends.

[0008] Preferably, the fixing member comprises: iron wire, copper wire, or waveguide wire.

[0009] Preferably, the reed switches are connected via a fixing piece, comprising: the reed switches are tied to the fixing piece via a high-temperature adhesive tape.

[0010] Preferably, the probe rod is made of non-magnetic metal material or engineering plastic.

[0011] Preferably, it further comprises: a junction box; the junction box is electrically connected to the load unit.

[0012] Preferably, a switch unit is connected in series between the load unit and the junction box.

[0013] Preferably, it further comprises: a connecting piece; a flange structure is fixedly sleeved on the lower end of the connecting piece, suitable for process connection.

[0014] Preferably, the external controller is an external switch or a PLC controller.

[0015] Compared with the existing technology, the beneficial effects of the present invention are: different from the traditional solution, a fixing part is used instead of the PCB to connect adjacent reed switches, so the number and position of the reed switches can be changed at will, and the position of the control switch and the measurement point can be customized according to the specific needs of the user to meet the specific requirements of different liquid level control points; at the same time, since it is not limited to the size of the traditional PCB, the diameter of the probe rod can be made smaller, reducing development time and cost and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure of the reed switch and the waveguide wire of the utility model;

[0018] Figure 3 It is a schematic diagram of the principle of the utility model;

[0019] Figure 4 This is a schematic diagram of the installation of the present utility model.

[0020] In the picture:

[0021] 1. Housing, 2. Connecting parts, 3. Probe rod, 4. Flange, 5. Junction box, 6. Float, 7. Reed switch, 8. Positioning clamp. DETAILED DESCRIPTION

[0022] 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.

[0023] In the currently widely used connecting rod float solution, it is a common practice in the industry to use a slender PCB printed circuit board inside the probe rod. The size requirements for the PCB are that the length must be greater than the length of the maximum measuring point, and the width needs to be less than the diameter of the probe rod. There are pads on the PCB for welding the reed switch, and the reed switch needs to be soldered to the PCB during production and assembly. The applicant found that there are some problems in its application: first, the number of pads on the PCB is fixed, so the number of points measured is also fixed, and the position cannot be changed at will. This results in the same PCB only being able to achieve measurements with a fixed number of measuring points and fixed measurement positions. If the client has other requirements, the PCB can only be redesigned. Every time there is a new requirement, the PCB must be updated, which seriously affects the application of the product. More importantly, there may be deviations when grasping the position of the reed switch, affecting the accuracy of the measurement position. This is time-consuming and labor-intensive. In addition, if the diameter of the probe rod is too small and too many measuring points are required, it will make PCB routing difficult, easy to break, and easy to bend. In addition, the general two-layer board is difficult to meet the conditions for the use of multiple floats, and a multi-layer board is required. This will inevitably cause great difficulty in production and assembly, and also increase costs.

[0024] Therefore, in order to solve the above technical problems, this solution discloses a connecting rod float liquid level switch. Figure 1-4 As shown, a connecting rod float liquid level switch of this solution may include:

[0025] The housing 1, connector 2, and probe 3 have the following specific structure: the housing 1 has an open opening on its lower side, the connector 2 correspondingly closes the open opening and is fixedly connected to the housing 1 via a flange 4, and the lower end of the connector 2 is provided with a threaded insertion opening that matches the probe 3; the probe 3 of the connecting rod float liquid level switch is hollow and contains a plurality of reed switches 7; adjacent reed switches 7 are connected by a fixing member, which may include iron wire, copper wire, or waveguide wire; the fixing member connecting the reed switches 7 includes the reed switches being tied to the fixing member with high-temperature tape; the reed switches transmit on / off signals to an external controller via signal lines at both ends, which may be an external switch or a PLC controller;

[0026] It also includes a junction box 5; the junction box 5 is electrically connected to a load unit. In some embodiments, the junction box 5 is electrically connected to the load unit. Furthermore, a switch unit is connected in series between the load unit and the junction box 5, and the switch unit can be replaced by a PLC.

[0027] In order to test the liquid level, a float 6 is slidably sleeved on the probe 3. Several reed switches 7 are set in the probe 3. A permanent magnet is fixed in the float 6. When the float 6 is floated to different positions, it will affect the reed switches 7 at different positions to achieve liquid level monitoring. Specifically, the reed switches 7 will be placed Figure 1 When the solution is poured into the probe 3 from the inlet of the container, refer to Figure 4 When the solution in the container rises to the height of the float 6, it will provide an upward buoyancy to the float 6, and the float 6 will move upward. When the float 6 moves near the reed switch 7, it will trigger the conduction or disconnection of the reed switch 7. Depending on the different reed switches used, different results will be presented. At that time, the two wires connected to the reed switch 7 will also be in the conduction and disconnection states. This signal will be received by the PLC, thereby promoting the normal operation of the system.

[0028] In some embodiments, reference Figure 2 The fixing part uses a waveguide wire. The waveguide wire is a conductor used to transmit magnetic field signals on magnetostriction. In this connecting rod float, it does not play the role of transmitting signals. In this solution, the reed switch 7 is tied to the waveguide wire with high-temperature tape. The role of the waveguide wire is only to fix the position of the reed switch and has no other function. In the connecting rod float, it is the reed switch, not the waveguide wire, that plays the role of transmitting signals. The working principle of the connecting rod float is:

[0029] Reference Figure 3 The float outside the probe moves with the liquid. When it reaches the height of the reed switch inside the probe, the reed switch will be affected by the magnetic field of the float and will produce two states: switch or closed. The specific switch or closed state depends on the type of reed switch selected. The signal generated by the reed switch will be transmitted to the PLC by the wires at both ends. The PLC will adjust the operation of the entire system after receiving the signal.

[0030] In specific implementations, if waveguide wire is not used, iron wire or other materials capable of fixing the reed switch position can be used instead. However, compared to ordinary iron wire and other fixing materials, waveguide wire has better temperature characteristics, with minimal changes under thermal expansion and contraction conditions, which will not affect the accuracy of the connecting rod float, making it more effective in harsh environments. Compared to the product probe, which has a slender PCB inside, the core difference between the waveguide wire and the reed switch is that the former offers advantages such as simplicity, strong applicability, flexibility, customization, and low cost, while the latter clearly lacks these characteristics. The former's purpose is to address the latter's shortcomings. The position and number of reed switches on the waveguide wire can be freely changed, perfectly solving the problem of fixed points on the PCB being immutable.

[0031] The external structure adapts to the needs of detection and replacement, and the float part 6 is restricted on the probe rod 3. At the same time, the floating range of the float part 6 is limited. In order to achieve the above effect, positioning clamps 8 are provided on the upper and lower sides of the float part 6. The positioning clamps 8 are matched and clamped on the probe rod 3. The positioning clamps 8 adopt existing technology to achieve the clamping effect, and cooperate with the rubber pad to ensure the clamping stability.

[0032] Specifically, the probe rod 3 is made of non-magnetic metal material, and may also be made of engineering plastic material.

[0033] In order to facilitate the overall installation and fixation, a connecting piece 2 is also included; a flange structure is provided on the fixed sleeve at the lower end of the connecting piece 2, which is suitable for process connection.

[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 connecting rod float liquid level switch, characterized in that: The probe rod (3) of the connecting rod float liquid level switch is hollow and is provided with a plurality of reed switches (7); adjacent reed switches (7) are connected via fixing members; and the reed switches transmit on / off signals to an external controller via signal lines at both ends.

2. A connecting rod float liquid level switch according to claim 1, characterized in that: The fixing member includes: iron wire, copper wire, or waveguide wire.

3. The connecting rod float liquid level switch according to claim 1, characterized in that: The reed switches (7) are connected via a fixing piece, comprising: the reed switches are bound to the fixing piece via a high-temperature adhesive tape.

4. The connecting rod float liquid level switch according to claim 1, characterized in that: The probe rod (3) is made of non-magnetic metal material or engineering plastic.

5. The connecting rod float liquid level switch according to claim 1, characterized in that: Also includes: A junction box (5); the junction box (5) is electrically connected to a load unit.

6. The connecting rod float liquid level switch according to claim 5, characterized in that: A switch unit is connected in series between the load unit and the junction box (5).

7. The connecting rod float liquid level switch according to claim 1, characterized in that: Also includes: Connecting piece (2); a flange structure is fixedly provided on the lower end of the connecting piece (2), suitable for process connection.

8. The connecting rod float liquid level switch according to claim 1, characterized in that: The external controller is an external switch or a PLC controller.

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