A single switch two-point liquid level gauge

Abstract

The present invention relates to a liquid level gauge, and in particular to a single-switch two-point liquid level gauge. It comprises a shell, a slider, a micro switch and a spring are arranged in the shell, a pull rope is installed in the spring, one end of the pull rope is connected to the slider, and the other end penetrates the shell and extends to the outside of the shell, and a hollow ball counterweight and a solid ball counterweight are arranged on the pull rope in sequence from top to bottom. The core electrical components of the present invention are all arranged in the shell, do not contact the liquid, and can adapt to various environments from pure water to acid and alkali concentrated solutions or other corrosive liquids; the present invention does not need to increase the number of liquid level gauges, nor does it need to increase the switch points of the liquid level gauge. A micro switch can be used to realize the signal output when the rising control point and the falling control point are not at the same liquid level during the process of liquid level rising and liquid level falling; the heights of the two liquid point points of the present invention are adjusted by two limit blocks arranged at both ends of the hollow ball counterweight, and the structure is simple and easy to use.

Description

Technical Field

[0001] The present invention relates to a liquid level meter, in particular to a single-switch two-point liquid level meter, which can be widely used in water and sewage environments, acid and alkali, mud, food and other environments. Background Art

[0002] In industrial production, it is often necessary to detect whether the water level is normal to ensure that the production pressure is within the rated range. The commonly used liquid level controller currently uses a float to drive the connecting rod to move or rotate to achieve fixed-point detection and control of the liquid level. The liquid level controller in the prior art generally uses an inductive float sensor. When the water level changes, the silicon rod connected to the float moves in the inductor coil, causing the inductance at both ends of the inductor coil to change. This changed inductance is sent to the secondary instrument. When the secondary instrument receives the changed liquid level signal of this inductance, it is converted into an indication and signal corresponding to the liquid surface. The liquid level is controlled by the liquid level signal indication. However, the liquid level controller used in the prior art generally only includes one float, which can only realize one-point liquid level detection and cannot meet the requirements of detecting the liquid level at multiple locations and points. In addition, water is easy to enter the float, and the inductive sensor is easy to be damaged by water. If only one float sensor is installed, when the float sensor is damaged, it will inevitably lead to inaccurate liquid level measurement values, making the liquid level controller unable to be used normally.

[0003] The method of controlling the liquid level switch with a pull rope is simple in structure, easy to use, and can be applied in many occasions. When using a pull rope liquid level gauge, it is often required that the equipment start at a certain liquid point and stop at another liquid point. In order to achieve this requirement, there are many ways. For example, increase the number of liquid level gauges, increase the number of control points of the liquid level gauge, etc. However, installing two liquid level gauges in one place will not only increase the cost of use, but also cause the pull rope to be entangled during use, resulting in inability to work and affecting use. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a single-switch two-point liquid level gauge, which does not require additional liquid level gauges or switch points of the liquid level gauge. The original liquid level control switch is still used to achieve that during the process of liquid level rising and falling, the rising control point and the falling control point are not at the same liquid surface, and the heights of the two points can be easily adjusted arbitrarily.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a single-switch two-point liquid level gauge comprises a shell, a slider, a micro switch and a spring are arranged in the shell, a transmission element of the micro switch abuts against the slider, the spring is installed in the slider, a pull rope is installed in the spring, one end of the pull rope is connected to the slider, and the other end penetrates the shell and extends to the outside of the shell, a hollow ball counterweight block and a solid ball counterweight block are arranged on the pull rope in sequence from top to bottom.

[0006] Furthermore, a first limit block is provided on the pull rope above the hollow ball counterweight, and a second limit block is provided on the pull rope between the hollow ball counterweight and the full counterweight, and the first limit block and the second limit block can move up and down along the pull rope.

[0007] Furthermore, a mounting card is provided at the bottom end of the shell.

[0008] Furthermore, the hollow ball counterweight and the solid ball counterweight are both made of PVC material.

[0009] Furthermore, the drawstring is made of nylon.

[0010] The beneficial effects of the present invention are:

[0011] 1. The core electrical components of the present invention, the slider, micro switch and spring are all arranged in the housing and do not contact the liquid, thus eliminating the possibility of electrical failure caused by liquid leakage, and can adapt to various environments from pure water to acid and alkali concentrated liquid or other corrosive liquids;

[0012] 2. The present invention does not need to increase the number of liquid level gauges, nor does it need to increase the switch points of the liquid level gauges. A micro switch can be used to realize the signal output when the rising control point and the falling control point are not at the same liquid level during the process of liquid level rising and liquid level falling;

[0013] 3. The heights of the two liquid point points of the present invention are adjusted by two limit blocks arranged at both ends of the hollow ball counterweight block, which has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1It is a structural schematic diagram of a single-switch two-point liquid level gauge according to a specific embodiment of the present invention;

[0016] Figure 2-7 It is a diagram of the use state of the present invention in the process of liquid level rising and falling;

[0017] Figure 8 Schematic diagram of the state change of the micro switch during the rising and falling process of the liquid level.

[0018] Reference numerals:

[0019] 1-housing; 2-slider; 3-micro switch; 4-mounting card; 5-spring; 6-pull rope; 7-hollow ball counterweight; 8-solid ball counterweight; 9-first limit block; 10-second limit block; 11-low liquid level line; 12-auxiliary liquid level line. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0021] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example

[0026] The liquid level meter of the present invention is realized based on the following two points: first, the action characteristic of the micro switch, that is, the process in which the transmission element of the micro switch is pushed by an external force to change the original state is a reversal project. To make the micro switch change from a closed state to an open state, or vice versa, there is a "step" of force change. After this "step", the external force retreats to the original level, and the micro switch still maintains the same state; second, the weight of an object in the air and in the liquid is different and the object with a specific gravity greater than that of the liquid will sink (gravity downward); the object with a specific gravity less than that of the liquid will float (gravity upward). The principle of the liquid level meter invented based on this is described as follows:

[0027] The structure of a single switch two-point liquid level meter provided by the present invention is as follows Figure 1 As shown, it includes a micro switch 3, a slider 2 that triggers the micro switch 3, a spring 5 that pushes the slider 2 upward, a pull rope 6 connecting the slider 2, two counterweights on the pull rope 6 (including a hollow ball counterweight 7 and a solid ball counterweight 8), and a mounting card 4 for fixing the housing 1 on a wall or a pipe, two adjustable position limit blocks (including a first limit block 9 and a second limit block 10), and the first limit block 9, the hollow ball counterweight 7, the second limit block 10 and the solid ball counterweight 8 are sequentially installed on the pull rope 6 from top to bottom. The first limit block 9 and the second limit block 10 can move up and down along the pull rope 6 to adjust the range of motion of the hollow ball counterweight 7, so as to meet the needs of different customers. The present invention can realize the start and stop of the equipment when the liquid level is at the two liquid points of the low liquid level line 11 and the auxiliary liquid level line 12. In addition, a single-chip microcomputer for receiving the output of the micro switch signal is also provided in the monitoring room.

[0028] The working process of the single switch two-point liquid level gauge of the present invention is as follows:

[0029] 1. Liquid level rising process:

[0030] like Figure 2 As shown in the figure, when the liquid level line is lower than the solid ball counterweight, the pull rope bears the total weight of the hollow ball counterweight and the solid ball counterweight in the air, and the slider compresses the spring to the lowest position under the downward force of the pull rope, and triggers the micro switch (normally closed point: separation);

[0031] As the liquid level rises, when the liquid level line is higher than the solid ball counterweight, Figure 3 As shown, the weight of the pull rope becomes lighter, but this force change cannot restore the micro switch;

[0032] like Figure 4 As shown, the liquid level continues to rise, and the hollow ball counterweight rises with the liquid level line. The gravity on the pull rope remains unchanged, and the state of the liquid level gauge remains unchanged.

[0033] like Figure 5 As shown, the liquid level and the hollow ball counterweight continue to rise. When the liquid level line rises to the first limit block, the buoyancy of the hollow ball counterweight reduces the gravity on the pull rope again, the slider moves up, and the micro switch resets (normally closed point: closed).

[0034] 2. Liquid level drop process:

[0035] like Figure 6 As shown, when the liquid level is lower than the hollow ball counterweight, the micro switch remains in the original state (normally closed point: closed);

[0036] like Figure 7 As shown, when the liquid level continues to drop, the hollow ball counterweight will drop with the liquid level, and the micro switch will remain in its original state until the liquid level line is lower than the solid ball counterweight, the gravity of the pull rope increases, and the micro switch operates (normally closed point: separated).

[0037] The schematic diagram of the state change of the micro switch during the rising and falling process of the liquid level is as follows Figure 8 shown.

[0038] Through the above analysis: the opening and closing of the micro switch are in different liquid level states. This function is very useful. With only one micro switch, the function of high opening and low stopping or low opening and high stopping can be realized.

[0039] The single switch two-point level gauge of the present invention has the advantages of the pull-rope control level gauge, and also has the following advantages: 1. It is simple and reliable; 2. It simplifies and saves the control circuit, saves a signal transmission cable of a liquid point, and also saves an input point of the PLC. The number of level gauges required for a project is relatively large. After using the level gauge of this patent technology, the cost savings are considerable.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single switch two-point liquid level gauge, characterized in that: The invention comprises a shell, wherein a slider, a micro switch and a spring are arranged in the shell, a transmission element of the micro switch abuts against the slider, the spring is installed in the slider, a pull rope is installed in the spring, one end of the pull rope is connected with the slider, and the other end penetrates the shell and extends to the outside of the shell, a hollow ball counterweight and a solid ball counterweight are arranged on the pull rope in sequence from top to bottom, a first limit block is arranged on the pull rope above the hollow ball counterweight, a second limit block is arranged on the pull rope at a position between the hollow ball counterweight and the full counterweight, and the first limit block and the second limit block can move up and down along the pull rope; the action characteristic of the micro switch is that the process in which the transmission element of the micro switch is pushed by an external force to change the original state is a flipping project, and in order to make the micro switch turn from a closed state to an open state, or vice versa, there is a threshold of force change, after which the external force retreats to the original degree, and the micro switch still maintains the same state.

2. A single switch two-point liquid level gauge according to claim 1, characterized in that: A mounting card is arranged at the bottom end of the shell.

3. A single switch two-point liquid level gauge according to any one of claims 1 or 2, characterized in that: The hollow ball counterweight and the solid ball counterweight are both made of PVC material.

4. A single switch two-point liquid level gauge according to claim 3, characterized in that: The draw rope is made of nylon.

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