Pointer adjusting type dry contact metal tube float flowmeter alarm switch

Abstract

The utility model relates to the technical field of flow meters, in particular to a pointer adjusting type dry contact metal tube float flow meter alarm switch which comprises an alarm pointer, a shell is sleeved outside the alarm pointer, one end of the alarm pointer is connected with a magnetic switch, a supporting seat is arranged inside the shell, and a magnet is arranged at one end of the supporting seat. When the flow of the flow meter reaches a preset threshold value, the magnetic substance in the metal pipe triggers the ferromagnetic material in the reed pipe, so that the circuit in the reed pipe is closed, the magnetic switch and the alarm pointer are triggered at the moment, and then the flow meter outputs an alarm signal. A dry contact signal of the reed switch is controlled through the magnet, the reed switch can be directly connected into an electrical loop in series, an external power supply is not needed, an isolation gate or a relay is not needed, electric sparks are not generated when the reed switch is used as the dry contact signal during triggering, and therefore contact abrasion and electric arcs are not caused.

Description

Technical Field

[0001] The utility model relates to the technical field of flowmeters, in particular to an alarm switch for a pointer-adjustable dry-contact metal tube float flowmeter. Background Art

[0002] Usually, the metal tube float flow will use a two-wire or three-wire inductive alarm switch or infrared alarm switch. The two-wire alarm switch uses NUMAR signal transmission and needs to be powered by a power supply of 8.2V or above. The alarm status is determined by the current, but this switch needs to be connected to an isolation barrier and then converted into the dry contact signal required by the user.

[0003] The three-wire alarm switch is powered by 24V and can output 0V or 24V voltage signals, which are isolated by relays and then converted into dry contact signals required by users. Existing metal tube float flowmeters are equipped with upper or lower limit alarm switches to realize the alarm function when the flow rate is greater than or less than the set value. When users use this alarm switch, they need to equip it with an isolation fence or relay, which is very inconvenient. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a pointer-adjustable dry-contact metal tube float flowmeter alarm switch.

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

[0006] A pointer-adjustable dry contact metal tube float flowmeter alarm switch comprises an alarm pointer, an outer sleeve of which is provided with a shell, one end of the alarm pointer is connected to a magnetic switch, a support seat is provided inside the shell, one end of the support seat is provided with a magnet, one end of the magnet is provided with a flow pointer, a flow scale is provided below the flow pointer, and the flow pointer can swing back and forth within the range scale of the flow scale.

[0007] Preferably, a reed switch is provided between the magnetic switch and the flow pointer, and the reed switch is connected between the magnetic switch and the flow pointer as a dry contact.

[0008] Preferably, ferromagnetic material is provided inside the reed switch.

[0009] Preferably, an output pipe is provided inside the shell, and one end of the output pipe is provided with a connecting line for connecting to the reed switch.

[0010] The beneficial effects of the utility model are:

[0011] A reed switch is used as the dry contact signal of the flow meter alarm switch. When the flow of the flow meter reaches a preset threshold, the magnetic material in the metal tube will trigger the ferromagnetic material inside the reed switch, thereby closing the circuit inside the reed switch. At this time, the magnetic switch and the alarm pointer are triggered, and the flow meter then outputs an alarm signal. Since the reed switch is a contactless and wear-free switch component, the dry contact signal of the reed switch is controlled by a magnet and can be directly connected in series to the electrical circuit without the need for an additional external power supply and an isolation fence or relay. At the same time, when the reed switch is used as a dry contact signal, no electric sparks will be generated when triggered, thereby not causing contact wear and arcing, thereby reducing failures caused by contact wear. At the same time, since the reed switch is a contactless design, it is not easily affected by corrosion and pollution, thereby making the reed switch more stable and safer in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of the pointer-adjustable dry-contact metal tube float flowmeter alarm switch proposed by the utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the pointer-adjustable dry contact metal tube float flowmeter alarm switch proposed by the utility model;

[0014] Figure 3 The utility model provides a schematic diagram of the connection structure between the alarm pointer and the flow pointer of the alarm switch of the pointer-adjustable dry contact metal tube float flowmeter.

[0015] In the figure:

[0016] 1. Alarm pointer; 2. Magnetic switch; 3. Flow pointer; 4. Magnet; 5. Shell; 6. Flow scale. DETAILED DESCRIPTION

[0017] 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 of the embodiments.

[0018] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0019] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0020] Example:

[0021] Reference Figure 1-3 The pointer-adjustable dry contact metal tube float flowmeter alarm switch comprises an alarm pointer 1, an outer sleeve of which is provided with a shell 5, one end of which is connected with a magnetic switch 2, a support seat is provided inside the shell 5, a magnet 4 is provided at one end of the support seat, a flow pointer 3 is provided at one end of the magnet 4, a flow scale 6 is provided below the flow pointer 3, and the flow pointer 3 can swing back and forth within the range scale of the flow scale 6.

[0022] A reed switch is provided between the magnetic switch 2 and the flow pointer 3 , and the reed switch is connected between the magnetic switch 2 and the flow pointer 3 as a dry contact.

[0023] The reed switch is provided with ferromagnetic material inside.

[0024] An output pipe is arranged inside the housing 5, and a connecting line for connecting the reed switch is arranged at one end of the output pipe.

[0025] In this embodiment, when the flow meter alarm switch needs to be used, the flow meter alarm switch is installed on the metal tube, and then the reed switch is used as the dry contact signal of the flow meter alarm switch. When the flow of the flow meter reaches the preset threshold, the flow pointer 3 swings to the maximum range of the flow scale 6. At this time, the magnetic material in the metal tube will trigger the ferromagnetic material inside the reed switch, thereby closing the circuit inside the reed switch, and then triggering the magnetic switch 2. After the magnetic switch 2 is closed, the alarm pointer 1 is triggered, and then the flow meter outputs an alarm signal. Since the reed switch is a contactless and wear-free switch element, when the reed switch is used as a dry contact signal, no electric sparks will be generated when it is triggered, thereby not causing contact wear and arcing, thereby reducing faults caused by contact wear. At the same time, since the reed switch is a contactless design, it is not easily affected by corrosion and pollution, thereby making the reed switch more stable and safer in harsh environments.

[0026] In the description of the present invention, 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" 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 a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pointer-adjustable dry contact metal tube float flowmeter alarm switch, comprising an alarm pointer (1), characterized in that: The alarm pointer (1) is externally sleeved with a housing (5), one end of the alarm pointer (1) is connected to a magnetic switch (2), a support seat is provided inside the housing (5), one end of the support seat is provided with a magnet (4), one end of the magnet (4) is provided with a flow pointer (3), a flow scale (6) is provided below the flow pointer (3), and the flow pointer (3) can swing back and forth within the range scale of the flow scale (6).

2. The pointer-adjustable dry contact metal tube float flowmeter alarm switch according to claim 1 is characterized in that: A reed switch is provided between the magnetic switch (2) and the flow pointer (3), and the reed switch is connected between the magnetic switch (2) and the flow pointer (3) as a dry contact.

3. The pointer-adjustable dry contact metal tube float flowmeter alarm switch according to claim 2 is characterized in that: The reed switch is provided with ferromagnetic material inside.

4. The pointer-adjustable dry contact metal tube float flowmeter alarm switch according to claim 2, characterized in that: An output pipe is arranged inside the housing (5), and a connecting line for connecting to a reed switch is arranged at one end of the output pipe.

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