KR20030043077A - Level switch - Google Patents

Abstract

PURPOSE: A level switch is provided to improve a solidity degree and a waterproofing degree and to adjust an operating point of a magnet exactly according to a water level. CONSTITUTION: A guide rod(50) is connected to a signal line(30) and embeds a vacuum tube lead switch(40) for generating a signal by a magnetic force. A magnet(61) is inserted in an outer circumference of the guide rod(50) and provides a magnetic force through upward and downward motions within a region of two stopper pairs(51) which determine upward and downward motion limitation. An insulation plate(70) has two fixing hole pairs(71) which are provided to receive both ends of the switch(40) so as to correspond to the center of the switch(40) and is inserted in the guide rod(50).

Description

Level switch {LEVEL SWITCH}

The present invention relates to a level switch, and more particularly, to an insulation plate having a fixing hole for receiving both ends of the tube reed switch in order to securely hold the tube reed switch in the guide rod, It contains a heat shrink film that is sealed and contracted by heat while accommodating all the signal lines connected to both ends of the vacuum tube reed switch, so that the action point of the magnet according to the water level can be precisely matched. It is about.

Level switches are generally used to generate signals for driving a pump or other drive means depending on the level of flow. For example, when a level switch is installed to maintain a constant level in a tank, a signal is generated according to the level so that the pump can be controlled to determine the input or discharge of the solution.

As an example, Utility Model Registration Application No. 1990-005524 dated April 30, 1990 discloses a level switch under the name of a two-level float switch.

As shown in FIG. 1, the two-level float switch 10 is provided with two vacuum tube reed switches 13 connected to the signal line 12 in the guide rod 11 up and down. The external movement limit is determined by a stopper 14, and a float 16 having a magnet 15 for connecting or disconnecting the tube reed switch 13 by magnetization is fitted.

As a use operation of this application, the magnet 15, which has not influenced the initial tube reed switch 13, has the outer periphery of the guide rod 11 together with the float 16 when the water level in the tank (not shown) becomes high. As it rises, it generates a signal by applying a magnetic force to the tube reed switch 13 to cause a short circuit, and the signal is provided to an external pump (not shown) or the like to raise the water level in the tank (not shown). The flow rate will be adjusted to achieve a consistent fit.

However, the two-level float switch 10 shown in FIG. 1 has a structure in which two vacuum tube reed switches 13 are simply inserted into the guide rod 11 while being connected to the signal line 12. ) If the external flow rate penetrates itself, it may not only cause short circuit or malfunction, but also the position of up and down is not maintained closely to maintain the precision of the level switch (2-level float switch; 10). Every time the two-level float switch 10 was installed, it was very difficult to maintain its precision.

As another example, a utility model registration application No. 1992-004579 filed March 21, 1992 proposes a level switch, and the tube reed switch 13 proposed in this level switch is shown in FIG.

The vacuum tube reed switch 13 has a function of generating signals by connecting two leads 13a and 13b in the horizontal direction in the vacuum tube 13c to be interconnected by magnetic force.

As another example, the utility model registration application No. 1997-025727 filed on September 11, 1997 discloses a level switch 20 equipped with an anti-sticking device.

In this application, as shown in FIG. 3, the lower part is vertically fixed to the solution in the storage tank (not shown) and coupled to the upper surface of the support body 22 having the resistance circuit 21 therein. And a support 25 having a support cap 24 having a cable 23 for transmitting a signal sensed by the resistance circuit 21 to a controller (not shown) for operating a solution supply pump (not shown). , While floating freely fitted to the support body 22 and on the inside of the level switch 20 composed of a float 27 provided with a magnet 26 for contacting the support body 22 to change the resistance value, It is proposed that a plurality of blades 28 are formed on the outer circumferential surface of 27 in parallel in the longitudinal direction.

However, this application also has a resistance circuit 21 for generating a signal through the magnet 26 providing magnetic force while being moved up and down by the float 27 moving according to the water level. When the external flow rate penetrates, it may still cause a short circuit or malfunction. In particular, the vertical position relationship of the resistance circuit 21 for maintaining the precision of the level switch 20 is not maintained closely. As a result, each time the level switch 20 is installed in the storage tank, it is very difficult to match the precision.

Accordingly, the present invention has been made to solve the above-described problems, the object of the present invention is to accept the both ends of the vacuum tube reed switch to tightly fix the vacuum tube reed switch generating a signal by the magnetic force in the guide rod. Proposes an insulating plate having a fixing hole, and further includes a heat shrink film which is sealed and contracted by heat while accommodating all the signal lines connected to both ends of the vacuum tube reed switch fitted in the fixing hole of the insulating plate. It is possible to precisely match the working point of and to provide a level switch with improved robustness and waterproofness.

1 is a front sectional view showing a level switch (two-level float switch) according to a conventional example.

2 is a structural diagram showing a vacuum tube reed switch applied to a level switch according to another conventional example.

3 is a perspective view including a partial cutaway showing a level switch according to another conventional example.

Figure 4 is an exploded perspective view showing a tube reed switch, an insulation plate and a heat shrink film applied to the level switch according to the present invention.

5 is an exploded perspective view showing a level switch according to the present invention.

6 is a sectional view showing a level switch according to the present invention;

7 is a perspective view of a level switch according to the present invention;

Explanation of symbols on the main parts of the drawings

30 signal line 31 covering

32: packing 40: tube reed switch

50: guide rod 51: stopper

60: plotter 61: magnet

70: insulation plate 71: fixing hole

80: heat shrink film 90: epoxy resin

100: level switch

The present invention for achieving the above object,

A guide rod connected to a signal line and sealed by incorporating a vacuum tube reed switch that generates a signal by magnetic force, and a pair of two sets which are fitted into the outer periphery of the guide rod to determine a vertical movement limit around each of the vacuum tube reed switches In a level switch comprising a plotter having a magnet that provides a magnetic force while moving up and down in the region of the stopper,

And an insulating plate fitted into the guide rod having a two-hole fixing hole for receiving both ends of the tube reed switch so that the center of the tube reed switch coincides with the center of the region of the two-piece stopper. It is made into the basic feature on the technical structure.

Hereinafter, a preferred embodiment of the level switch 100 according to the present invention will be described in detail with reference to the drawings. There may be many embodiments of the invention and these embodiments will better understand the objects, features and advantages of the invention.

4 is an exploded perspective view showing a tube reed switch 40, an insulating plate 70, and a heat shrink film 80 applied to a level switch according to the present invention, and FIG. 5 is an exploded view showing a level switch 100 according to the present invention. Perspective view.

As shown in FIGS. 4 and 5, the level switch 100 according to the present invention is installed in a tank mainly for controlling the flow rate, and thus the magnetic force of the magnet 61 provided in the floater 60 moving according to the water level. The vacuum tube reed switch 40 which generate | occur | produces a signal by the main structure is made.

The vacuum tube reed switch 40 is typically as shown in FIG. 2 and is not particularly limited as long as it generates a signal by magnetic force. Of course, the vacuum tube reed switch 40 is connected to the signal line 30 and inside the guide rod 50. It is built in and sealed with the packing 32 or the like.

The value of the present invention described below will be further enhanced in view of the fact that water or other flow rates may enter between the packings 32 if the guide rods 50 are simply sealed with the packings 32 or the like.

More specifically, the guide rod 50 has an open shape on one side and a closed rod shape on the other side to allow the signal line 30 to be drawn therein, and its length can be determined according to the number of the vacuum tube reed switches 40. Until now, a material mainly made of metal has been selected and used.

At this time, the magnetic force of the magnet 61 moved up and down with the plotter 60 according to the water level must accurately affect the vacuum tube reed switch 40, so that the flow rate in the tank can be maintained at a desired reference value. Often, the guide rod 50 is magnetized in advance by the magnetic force of the magnet 61 so that the tube reed switch 40 must generate a signal in advance or irregularly in response to the standard level. As a result, pump malfunction or frequent leveling in the tank occurred frequently.

Therefore, in the present invention, the material of the guide rod 50 is provided as a synthetic resin, and thus the guide rod 50 made of synthetic resin can be formed by the first injection process, so that the processing of the guide rod 50 made of metal is performed. It is much more efficient than the production by the cost and can reduce the cost, and the influence (magnetic force) of the pure magnet 61 is reflected in the vacuum tube reed switch 40 as it is not affected or affected by the magnetic force of the second magnet (61) And, third, when trying to fix the stopper 51 to be described later has the usefulness to freely implement the fixing of the stopper 51 by exhibiting a fine elastic force of the synthetic resin itself.

In this way, two pairs of stoppers 51 are fixed to the outer periphery of the guide rod 50 made of synthetic resin, which determines the upper and lower limits of movement, with each of the tube tube reed switches 40 fitted therein. In the region of the stopper 51 formed of one set, a plotter 70 is provided with a magnet 61 which is fitted to the outer periphery of the guide rod 50 and moves up and down to provide magnetic force to the vacuum tube reed switch 40. .

In the present invention, as the conventional example indicates, the tube reed switch 40 connected by the signal line 30 is simply inserted in the guide rod 50 so that the corresponding position with the magnet 61 can be assembled. In consideration of the fact that an error occurs every time, an insulation plate capable of determining the position of the vacuum tube reed switch 40 in advance so that the center of the vacuum tube reed switch 40 coincides with the center of the region of the two pairs of stoppers 51. 70 is to propose.

The insulating plate 70 has two sets of fixing holes 71 for receiving both ends of the vacuum tube reed switch 40, and the fixing holes 71 are fitted to the outer circumference of the guide rod 50. Considering the position of the magnet 61 is drilled in advance (before assembly) to the insulating plate 70.

Since both ends of the vacuum tube reed switch 40 are inserted into the fixing holes 71 and connected to the signal line 30, the position of the vacuum tube reed switch 40 is inevitably dependent on the insulating plate 70. It can be seen that the fixing force is maximized as compared to the one put in the guide rod 50 while being simply connected to the signal line 30, as the vacuum tube reed switch 40 is dependent on the insulating plate 70 When the insulating plate 70 manufactured as the same size as the length of 50 is inserted into the guide rod 50, both ends of the vacuum tube reed switch 40 can be received in advance in consideration of the position of the magnet 61. Since two sets of fixing holes 71 can be precisely drilled, the working point of the magnet 61 according to the water level can be accurately matched in using the actual level switch 100.

In addition, the level switch 100 according to the present invention receives all the signal lines 30 connected to both ends of the tube reed switch 40 fitted in the fixing hole 71 of the insulating plate 70 by heat. The heat shrink film (Heat Shrinkable Film) 80 is further included.

The heat shrinkable film 80 generates residual stresses by stretching polymers having inherent physical properties, that is, polymers having a molecular chain length of a certain level or higher, and the residual stress is increased when a certain amount of heat is supplied while the residual stresses are retained. Using the characteristic that shrinkage occurs as it is eliminated, the heat is removed after the exterior is covered with all the signal lines 30 connected to both ends of the vacuum tube reed switch 40 fitted in the fixing hole 71 of the insulating plate 70. By receiving and sealing itself, the tube reed switch 40 is inserted into the fixing hole 71 of the insulating plate 70 to maintain the state connected to the signal line 30 more firmly, and at the same time, the guide rod ( 50) It has the effect of not being influenced by the moisture (fluid) that can flow into the inside of the product, and can achieve both robustness and waterproofness.

In this way, the vacuum tube reed switch 40 and the insulating plate 70 connected to the signal line 30 are integrated in the heat shrink film 80 and integrated so that the end of the signal line 30 is peeled off to be connected to the vacuum tube reed switch 40. ) Is bundled together with the sheath 31 of the signal line 30 exposed to the outside of the guide rod 50 by the heat shrink film 80 to facilitate the handling, as well as the guide rod 50 If the vacuum tube reed switch 40 is put in the) it may not have any influence on the vacuum tube reed switch 40, and cooperate to more freely fill the epoxy resin 90 in the guide rod (50) Additional benefits can be obtained.

The epoxy resin 90 can supplement the fear of deformation or breakage of the guide rod 50 made of synthetic resin when the flow rate in the tank is low or high temperature, and can further improve the airtightness together with the heat shrink film 80. It's very useful in that sense.

Level switch 100 according to the present invention having such a configuration may be made of a single tube tube reed switch 40 and the magnet 61, but to control a plurality of pumps, etc. according to the height of the water level or adjust the cold temperature In order to control a separate driving means to provide two or more vacuum tube reed switch 40, in this case, the insulating plate 70 or under the condition that the heat shrink film 80, the insulating plate 70 ) Is further provided with two to five pairs of fixing holes 71 of two pairs in a vertical line to fix two to five vacuum tube reed switches 40 connected to the signal line 30, respectively. The guide rod 50 has a vertical movement limit so that the centers of the movement limits of the two to five plotters 60 having the magnets 61 at the centers of the two to five vacuum tube reed switches 40 coincide with each other. The crystallization may further include two to five pairs of stoppers 51 in two pairs.

If briefly described the operation and operation of the level switch 100 according to the present invention as described above.

6 is a cross-sectional view showing a level switch 100 according to the present invention, Figure 7 is a perspective view showing a level switch 100 according to the present invention.

The level switch 100 according to the present invention is usefully fixed to a place, for example, a tank, for controlling a pump or a cold driving means by checking a flow rate or a water level such as ice.

As a preferred embodiment, as shown in FIGS. 6 and 7, when the water level of the flow rate is increased, the plotter 60 including the magnet 61 rises along the outer circumference of the guide rod 50 to allow the vacuum tube reed switch 40. ), And the tube reed switch 40 is opened and connected to each other by the magnetic force of the magnet 61 to generate a signal.

This signal is a kind of short-circuit signal, which is used as a signal for controlling a pump or other cold and hot driving means. Then, when the pump is driven to pump the flow rate, the water level in the tank is lowered again, and accordingly, the plotter 60 is lowered. Since the magnetic force of the magnet 61 provided to the tube reed switch 40 does not reach, the tube reed switch 40 is opened and does not provide any more signal. The flow rate is filled again, and this operation is repeated continuously.

As described above, the level switch 100 according to the present invention has a fixing hole 71 for receiving both ends of the tube reed switch 40 in order to securely fix the tube reed switch 40 in the guide rod 50. By providing the insulation plate 70, the position of the vacuum managed switch 40 depends on the insulation plate 70, thereby accurately correcting the operating point of the magnet 61 according to the water level in using the actual level switch 100. It is useful to be able to match.

In addition, the level switch 100 according to the present invention receives all the signal lines 30 connected to both ends of the tube reed switch 40 fitted in the fixing hole 71 of the insulating plate 70 by heat. It further includes a heat shrink film 80 which is sealed and contracted to be inserted into the fixing hole 71 of the insulating plate 70 to maintain the state connected to the signal line 30 more firmly and tightly, and at the same time, the guide rod 50 It has the effect of not being influenced by the moisture that can flow into the inside of the device, thereby achieving both robustness and waterproofness.

Then, the vacuum line reed switch 40 and the insulating plate 70 connected to the signal line 30 are integrated in the heat shrink film 80 and integrated so that the end of the signal line 30 is peeled off to be connected to the vacuum line reed switch 40. ) Is bundled together with the sheath 31 of the signal line 30 exposed to the outside of the guide rod 50 by the heat shrink film 80 is not only easier to handle but also guide rod 50 If it is put inside, it may not have any influence on the vacuum tube reed switch 40, and the additional benefit of more freely filling the epoxy resin 90 in the guide rod 50 can be obtained.

In addition, the epoxy resin 90 can compensate for the deformation or damage of the guide rod 50 made of synthetic resin when the flow rate in the tank is low or high temperature, and further improves the airtightness together with the heat shrink film 80. Exercising can be.

In addition, since the material of the guide rod 50 may be molded by an injection process using a synthetic resin, it may be much more efficient and reduce the cost than the production by the processing of the guide rod 50 made of metal, and the magnet 61 The influence (magnetic force) of the pure magnet 61 can be reflected in the vacuum tube reed switch 40 as it is not influenced or not affected by the magnetic force of the) and exhibits a fine elastic force of the synthetic resin itself when fixing the stopper 51. There is a useful that can be achieved more freely the fixing of the stopper (51).

Claims (5)

A guide rod 50 which is connected to the signal line 30 and is sealed by having a vacuum tube reed switch 40 which generates a signal by magnetic force, and is inserted into an outer circumference of the guide rod 50 and is inserted into the outer tube periphery of the guide rod 50. A level comprising a floater 60 having a magnet 61 which provides magnetic force while moving up and down within an area of two pairs of stoppers 51 which determine the upper and lower movement limits with respect to each center. In the switch 100, It is provided with two one set fixing hole 71 which receives both ends of the said tube tube reed switch 40 so that the center of the said tube tube reed switch 40 may coincide with the center of the area | region of the said two sets of stopper 51. The level switch 100, characterized in that it comprises an insulating plate 70 is fitted into the guide rod (50). The method of claim 1, The heat-shrink film 80 which is sealed and shrinked by heat while accommodating the signal line 30 connected to both ends of the tube reed switch 40 fitted in the fixing hole 71 of the insulating plate 70 is contained. Level switch 100, characterized in that further comprises. The method according to claim 1 or 2, Level switch (100) characterized in that it further comprises an epoxy resin (90) filled in the guide rod (50). The method according to claim 1 or 2, The insulation plate 70 has two to five pairs of fixing holes 71 formed of two in order to fix the two to five vacuum tube reed switches 40 connected to the signal line 30, respectively. It is further equipped with a vertical straight line, The guide rod 50 moves up and down so that the centers of the moving limits of the two to five plotters 60 each having the additional magnets 61 at the centers of the two to five vacuum tube reed switches 40 coincide with each other. Level switch (100), characterized in that it further comprises two to five pairs of stoppers (51) of delimiting limits. The method according to claim 1 or 2, The guide rod 50 is a level switch 100, characterized in that the synthetic resin.