Electronically controlled self-sealing float level switch calibration device

Abstract

The present invention discloses an electrically controlled self-sealing float liquid level switch calibration device, comprising a box body, a horizontal panel fixedly installed on the top of the box body and a water level display transparent tube, a self-sealing mechanism, a wiring terminal and an electrical control box; two relatively arranged positioning V-shaped brackets are fixedly installed on the top of the horizontal panel, and the positioning V-shaped brackets are used to place the float liquid level switch to be calibrated; the electrically controlled self-sealing float liquid level switch calibration device of the present invention can automatically complete water inlet and outlet actions according to the water level, which can reduce the number of calibration staff and labor intensity on the one hand, and improve the calibration accuracy on the other hand; in addition, the present invention also discloses a self-sealing mechanism, which does not need to take other sealing measures after the float liquid level switch is installed, and automatic sealing without leakage can be completed by the gravity of the float liquid level switch.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal instrument inspection and calibration, and specifically relates to a calibration device for calibrating the switch action scale of a float liquid level switch before installation. Background Art

[0002] The float liquid level switch is a commonly used device for detecting the liquid level of a container. It can output an alarm signal of high or low liquid level, thereby ensuring the safe operation of the process system. It is commonly used in thermal power plants for liquid level detection of high-pressure heaters, low-pressure heaters, deaerators, drain bags, etc. Participate in the protection control and alarm function of the system. In the past, before on-site installation, the installation was carried out according to the mark on the liquid level switch at the factory, but the factory mark was marked according to the design, and its mark was determined according to the rated parameters of the production design, which was inconsistent with the rated parameters of the actual system used, resulting in a large error. Some use a sinking method to perform a simple action scale check. Two people lift the switch and slowly sink it into the water tank until the switch action is calibrated by a third person according to the water surface. In this way, the calibration is relatively large because the switch is not horizontal and the sight of the marker cannot be flush with the water surface. Both methods will cause inaccurate installation positions and easily lead to the phenomenon of false alarm signals. In order to solve the above problems, the present invention manufactures an electrically controlled self-sealing float liquid level calibration device to solve the above problems and improve the action accuracy of the float liquid level switch. Summary of the invention

[0003] The purpose of the present invention is to provide a calibration device for an electrically controlled self-sealing float liquid level switch.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] An electrically controlled self-sealing float liquid level switch calibration device comprises a box body, a horizontal panel fixedly mounted on the top of the box body and a water level display transparent tube, and also comprises a self-sealing mechanism, a wiring terminal and an electrical control box;

[0006] Two relatively arranged positioning V-shaped brackets are fixedly installed on the top of the horizontal panel. The positioning V-shaped brackets are used to place the float liquid level switch that needs to be calibrated. Since the two V-shaped brackets are exactly the same, when the float liquid level switch is placed, the float liquid level switch and the horizontal panel are kept in an equal state, which improves the accuracy of calibration.

[0007] The self-sealing mechanism includes a U-shaped bracket fixedly mounted on the horizontal panel, and the U-shaped bracket is fixedly mounted in the space formed by the horizontal panel and the box body. The self-sealing mechanism also includes a conical sealing head, which is sleeved on one end of the water level display transparent tube and the water inlet pipe. The side of the conical sealing head close to the horizontal panel is the side with a larger area. The horizontal panel is provided with a through hole corresponding to the conical sealing head, and the area of ​​the through hole is larger than the bottom area of ​​the conical sealing head. When the vertical float liquid level switch is detected, the compression spring contracts due to the gravity of the switch, and the bottom of the vertical float liquid level switch contacts the horizontal panel, achieving a fixing effect. The use of this device is also suitable for the calibration of the vertical float liquid level switch.

[0008] One end of the spring is connected to the bottom of the conical sealing head, and the other end of the spring is fixedly mounted on a U-shaped bracket. The spring is sleeved on one end of a water level display transparent tube and a water inlet pipe. A conical head positioning sleeve is also installed on the U-shaped bracket, and the conical head positioning sleeve is sleeved on the water inlet pipe, so that the conical head can reciprocate in the vertical direction.

[0009] As a further solution of the present invention, a leveling bubble is installed on the horizontal panel, and a plurality of adjustable legs are fixedly installed on the bottom of the box.

[0010] As a further solution of the present invention, the device also includes an inlet throttle plate and a drain throttle plate, wherein the inlet throttle plate is connected to the water inlet of the float liquid level switch to be calibrated through a pipe, and the drain throttle plate is connected to the water outlet of the float liquid level switch to be calibrated through a pipe.

[0011] As a further solution of the present invention, the electrical control box is provided with a water inlet solenoid valve, a drain solenoid valve, a water level rise switch action indicator light, a water level drop switch action indicator light, a stop button, a water inlet button and a drain button;

[0012] The electrical control box is also provided with an electrical control circuit for controlling the operation of the water inlet solenoid valve, the water discharge solenoid valve, the water level rise switch action indicator light and the water level drop switch action indicator light;

[0013] The water inlet button is used to connect the circuit to power on and operate the float liquid level switch to let water in;

[0014] The drain button is used to connect the circuit to power on and perform drain operation on the float liquid level switch;

[0015] The stop button is used to cut off or turn on the electrical control circuit.

[0016] As a further solution of the present invention, a method for calibrating a float liquid level switch by the above device comprises the following steps:

[0017] S1. Place the electric self-sealing float liquid level switch calibration device on a stable platform, connect the external water supply port to the water inlet of the electric self-sealing float liquid level switch calibration device, observe the bubble position of the level bubble, adjust the adjustable legs to make the bubble of the level bubble in the middle position, and ensure that the level panel is in a horizontal position;

[0018] S2. Connect the device to an external 220V AC power supply, and place the float level switch on the V-shaped frame. When placing the float level switch, align the water inlet with the conical sealing head. At this time, the float level switch is fixed on the V-shaped frame, and its own weight presses the conical sealing head to ensure no leakage.

[0019] S3. Connect the two contacts of the float level switch that close when the water level is high and the two contacts that close when the water level is low to the wiring terminals;

[0020] S4. Turn on the leakage protection air switch in the electrical control box, the water level drops and the switch action indicator lights up, press the water inlet button, and the water inlet solenoid valve is energized to let water into the float liquid level switch. Due to the water inlet throttling plate, the water inlet is slow, simulating the slow rise of the water level in actual use. When the water level rises to the high water level alarm value of the float liquid level switch, the switch contact acts, the high water level indicator lights up, the water inlet solenoid valve loses power, and the water inlet stops. At this time, the water level in the liquid level switch is displayed on the water level display transparent tube. According to the water level of the water level display transparent tube, use a marker to mark the scale line of the high water level action on the shell of the float liquid level switch;

[0021] S5. Press the drain button, and the drain solenoid valve will be energized to drain water to the float level switch. Due to the drain throttling plate, the water is drained slowly, simulating the slow drop of the water level in actual use. When the water level drops to the low water level alarm value of the float level switch, the switch contacts will be activated, the low water level indicator will light up, the drain solenoid valve will lose power, and the draining will stop. At this time, the water level in the float level switch will be displayed on the transparent tube of the water level display. According to the water level of the transparent tube, use a marker to mark the scale line of the low water level action on the shell of the float level switch;

[0022] S6. Remove the connection line between the electronically controlled self-sealing float level switch calibration device and the float level switch, press the drain button to drain the water in the switch, remove the float level switch, and the calibration is completed.

[0023] Beneficial effects of the present invention:

[0024] The electrically controlled self-sealing float liquid level switch calibration device described in the present invention can automatically complete the water inlet and outlet actions according to the water level. On the one hand, it can reduce the number of calibration staff and the labor intensity, and on the other hand, it can improve the calibration accuracy. In addition, the present invention also discloses a self-sealing mechanism. After the float liquid level switch is installed, no other sealing measures need to be taken. Automatic sealing without leakage can be completed through the gravity of the float liquid level switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 It is a front view of the electric-controlled self-sealing float liquid level switch calibration device of the present invention;

[0027] Figure 2 It is a side view of the electronically controlled self-sealing float liquid level switch calibration device of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the self-sealing mechanism. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] An electronically controlled self-sealing float level switch calibration device, such as Figures 1 to 3 As shown, it includes a box body 18, a horizontal panel 5 is fixedly installed on the top of the box body 18, and a plurality of adjustable legs 16 are fixedly installed on the bottom of the box body 18. In one embodiment of the present invention, the number of the adjustable legs 16 is 4; a self-sealing mechanism 2, a water level display transparent tube 3, a level bubble 4, a wiring terminal 6, a water inlet throttle plate 7, a water discharge throttle plate 8, a water inlet solenoid valve 9, a water discharge solenoid valve 10, a water level rise switch action indicator 11, a water level drop switch action indicator 12, a stop button 13, a water inlet button 14, a water discharge button 15, and an electrical control box 17 are also installed in the box body 18;

[0031] The electrical control box 17 is used to control the opening and closing actions of the water inlet solenoid valve 9, the water discharge solenoid valve 10, the water level rising switch action indicator light 11 and the water level falling switch action indicator light 12;

[0032] Two relatively arranged positioning V-shaped brackets 1 are fixedly installed on the top of the horizontal panel 5. The function of the positioning V-shaped bracket 1 is to place the float liquid level switch that needs to be calibrated. Since the bending angles of the two V-shaped clips are all the same, when the float liquid level switch is placed, it will automatically clamp and keep the liquid level switch parallel to the horizontal panel 5, which simplifies the work of fixing and adjusting the switch placement.

[0033] The self-sealing mechanism 2 includes a U-shaped bracket 22 fixedly mounted on the horizontal panel 5, and the U-shaped bracket is fixedly mounted in the space formed by the horizontal panel 5 and the box body 18. The self-sealing mechanism 2 also includes a conical sealing head 21, and the conical sealing head 21 is sleeved on one end of the water level display transparent tube 3 and the water inlet pipe 23. The side of the conical sealing head 21 close to the horizontal panel 5 is a side with a larger area. The horizontal panel 5 is provided with a through hole corresponding to the conical sealing head 21, and the area of ​​the through hole is larger than the area of ​​the bottom of the conical sealing head 21.

[0034] The water level display transparent tube 3 is a U-shaped tube structure, one end of the water level display transparent tube 3 is fixedly sleeved by a conical sealing head 21, and the other end of the water level display transparent tube 3 penetrates the horizontal panel 5 and is exposed to the external environment, which is convenient for detection personnel to detect the water level in the float liquid level switch;

[0035] The bottom of the conical sealing head 21 is connected to one end of a spring 25, and the other end of the spring 25 is fixedly mounted on a U-shaped bracket 22. The spring 25 is sleeved on one end of the water level display transparent tube 3 and the water inlet pipe 23. A conical head positioning sleeve 26 is also mounted on the U-shaped bracket 22, and the conical head positioning sleeve 26 is sleeved on the water inlet pipe 23, thereby achieving a positioning effect, so that the conical head 21 can reciprocate in the vertical direction;

[0036] When working, the float liquid level switch is placed on the V-shaped bracket 1, and the weight of the float liquid level switch itself is pressed on the conical head 21, the spring 25 is forced to shrink, and the conical head 21 is pressed on the horizontal panel 5, and the through hole on the horizontal panel 5 is sealed by the conical head 21. At the same time, the switch water inlet of the float liquid level switch is in close contact with the conical head 21, and the water inlet pipe 23 and the display connecting pipe 24 are respectively connected to the pipelines in the float liquid level switch;

[0037] After the float liquid level switch is placed on the device, the alarm contact of the float liquid level switch is connected to the electrical control box 17, and the float liquid level switch is calibrated;

[0038] The calibration method of the float liquid level switch by the above-mentioned electronically controlled self-sealing float liquid level switch calibration device is as follows:

[0039] S1. Place the electric self-sealing float liquid level switch calibration device on a stable platform, connect the external water supply port to the water inlet of the electric self-sealing float liquid level switch calibration device, observe the bubble position of the level bubble 4, adjust the adjustable legs 16, make the bubble of the level bubble in the middle position, and ensure that the level panel 5 is in a horizontal position;

[0040] S2. Connect the device to an external 220V AC power supply, and place the float level switch on the V-shaped frame 1. When placing the float level switch, align the water inlet of the float level switch with the conical sealing head 2. At this time, the float level switch is fixed on the V-shaped frame, and its own weight presses the conical sealing head 21 to ensure that there is no leakage.

[0041] S3, connect the two contacts of the float liquid level switch that close when the water level is high and the two contacts that close when the water level is low to the wiring terminal 6;

[0042] S4, turn on the leakage protection air switch in the electrical control box 17, the water level drop switch action indicator light 12 lights up, press the water inlet button 14, the water inlet solenoid valve 9 is energized to let water into the float liquid level switch, because of the water inlet throttling plate 7, the water inlet is slow, simulating the slow rise of the water level in actual use, when the water level rises to the high water level alarm value of the float liquid level switch, the switch contact is actuated, the intermediate relay K1 is actuated, the high water level indicator light 11 lights up, the AC contactor KM1 loses power, the water inlet solenoid valve 9 loses power, and the water inlet stops. At this time, the water level in the liquid level switch is displayed on the water level display transparent tube 3, and the scale line of the high water level action is marked on the housing of the float liquid level switch with a marker according to the water level of the water level display transparent tube 3;

[0043] S5, press the drain button 15, the drain solenoid valve 10 is energized to drain the float liquid level switch. Due to the drain throttling plate, the water is drained slowly, simulating the slow drop of the water level in actual use. When the water level drops to the low water level alarm value of the float liquid level switch, the switch contacts are actuated, the intermediate relay K2 is actuated, the low water level indicator 12 is lit, the AC contactor KM2 loses power, the drain solenoid valve 10 loses power, and the draining stops. At this time, the water level in the float liquid level switch is displayed on the water level display transparent tube 3. According to the water level of the transparent material tube, the scale line of the low water level action is marked on the housing of the float liquid level switch with a marker pen;

[0044] S6. Remove the connection line between the electronically controlled self-sealing float liquid level switch calibration device and the float liquid level switch, press the drain button 15 to drain the water in the switch, remove the float liquid level switch, and the calibration is completed.

[0045] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An electric controlled self-sealing float liquid level switch calibration device, comprising a box (18), a horizontal panel (5) fixedly mounted on the top of the box (18) and a water level display transparent tube (3), characterized in that: It also includes a self-sealing mechanism (2), a wiring terminal (6) and an electrical control box (17); Two positioning V-shaped brackets (1) arranged opposite to each other are fixedly mounted on the top of the horizontal panel (5), and the positioning V-shaped brackets (1) are used to place a float liquid level switch that needs to be calibrated; The self-sealing mechanism (2) comprises a U-shaped bracket (22) fixedly mounted on the horizontal panel (5), the U-shaped bracket (22) being fixedly mounted in a space formed by the horizontal panel (5) and the box body (18), the self-sealing mechanism (2) also comprises a conical sealing head (21), the conical sealing head (21) being sleeved on one end of the water level display transparent tube (3) and the water inlet pipe (23), the side of the conical sealing head (21) close to the horizontal panel (5) being a side with a larger area, the horizontal panel (5) being provided with a through hole corresponding to the conical sealing head (21), and the area of ​​the through hole being larger than the bottom area of ​​the conical sealing head (21); The bottom of the conical sealing head (21) is connected to one end of a spring (25), the other end of the spring (25) is fixedly mounted on a U-shaped bracket (22), the spring (25) is sleeved on one end of a water level display transparent tube (3) and a water inlet pipe (23), and a conical head positioning sleeve (26) is also mounted on the U-shaped bracket (22), the conical head positioning sleeve (26) is sleeved on the water inlet pipe (23), so that the conical sealing head (21) can reciprocate in the vertical direction; The device also includes a water inlet throttle plate (7) and a water discharge throttle plate (8), wherein the water inlet throttle plate (7) is connected to the water inlet of the float liquid level switch to be calibrated through a pipeline, and the water discharge throttle plate (8) is connected to the water outlet of the float liquid level switch to be calibrated through a pipeline; The electrical control box (17) is provided with a water inlet solenoid valve (9), a water discharge solenoid valve (10), a water level rise switch action indicator light (11), a water level drop switch action indicator light (12), a stop button (13), a water inlet button (14) and a water discharge button (15); An electrical control circuit is also provided in the electrical control box (17) for controlling the operation of the water inlet electromagnetic valve (9), the water discharge electromagnetic valve (10), the water level rise switch operation indicator light (11) and the water level drop switch operation indicator light (12); The water inlet button (14) is used to connect the circuit to power on and operate the float liquid level switch to inlet water; The drainage button (15) is used to connect the circuit to power on and perform drainage operation on the float liquid level switch; The stop button (13) is used to cut off or turn on the electrical control circuit.

2. The electronically controlled self-sealing float liquid level switch calibration device according to claim 1 is characterized in that: A level bubble (4) is installed on the level panel (5), and a plurality of adjustable legs (16) are fixedly installed on the bottom of the box body (18).

3. The electronically controlled self-sealing float liquid level switch calibration device according to claim 1 is characterized in that: The method for calibrating the float level switch by the above device includes the following steps: S1. Place the electric-controlled self-sealing float liquid level switch calibration device on a stable platform, connect the external water supply port to the water inlet of the electric-controlled self-sealing float liquid level switch calibration device, observe the bubble position of the level bubble (4), adjust the adjustable legs (16) so that the bubble of the level bubble (4) is in the middle position, and ensure that the level panel (5) is in a horizontal position; S2. Connect the device to an external 220V AC power supply, and place the float liquid level switch on the V-shaped frame (1). When placing the float liquid level switch, the water inlet is aligned with the conical sealing head (21). At this time, the float liquid level switch is fixed on the V-shaped frame (1), and its own weight presses the conical sealing head (21) to ensure that there is no leakage. S3, connect the two contacts of the float liquid level switch that close when the water level is high and the two contacts that close when the water level is low to the wiring terminal (6); S4, the leakage protection air switch in the electrical control box (17) is turned on, the water level drop switch action indicator (12) is lit, the water inlet button (14) is pressed, and the water inlet solenoid valve (9) is energized to let water into the float liquid level switch. Due to the water inlet throttling plate (7), the water inlet is slow, simulating the slow rise of the water level during actual use. When the water level rises to the high water level alarm value of the float liquid level switch, the switch contact is actuated, the water level rise switch action indicator (11) is lit, the water inlet solenoid valve (9) loses power, and the water inlet stops. At this time, the water level in the liquid level switch is displayed on the water level display transparent tube (3). According to the water level of the water level display transparent tube (3), the scale line of the high water level action is marked on the housing of the float liquid level switch with a marker pen; S5, press the drain button (15), the drain solenoid valve (10) is energized to drain water from the float liquid level switch. Due to the drain throttling plate (8), the water is drained slowly, simulating the slow drop of the water level in actual use. When the water level drops to the low water level alarm value of the float liquid level switch, the switch contact is actuated, the water level drop switch action indicator (12) is lit, the drain solenoid valve (10) loses power, and the draining stops. At this time, the water level in the float liquid level switch is displayed on the water level display transparent tube (3). According to the water level of the transparent material tube, the scale line of the low water level action is marked on the housing of the float liquid level switch with a marker pen; S6. Remove the connection line between the electronically controlled self-sealing float liquid level switch calibration device and the float liquid level switch, press the drain button (15) to drain all the water in the switch, remove the float liquid level switch, and the calibration is completed.

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