JPH0527625U - Flow meter - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flow meter capable of easily confirming the position of a magnetic detection means such as a reed switch for detecting approach of a permanent magnet and capable of reliably operating the magnetic detection means. The purpose is to [Structure] An information processing circuit for measuring a rotational speed, a rotational speed, etc. of an impeller 24 to obtain a plurality of pieces of information such as a flow rate and a flow velocity of a fluid, and a measuring unit having a display device 32 capable of selectively displaying the information. 30 and a magnetic detecting means 34 arranged in the measuring section 30 for switching the information displayed on the display device 32 each time the magnetism is detected, and an outer surface of the measuring section 30, which is the magnetic detecting means. A concave portion 38 is provided at a position corresponding to a portion where 34 is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flow meter, and more particularly to a flow meter for measuring the flow rate or flow velocity of a fluid such as gas or liquid.

[0002]

[Prior Art]

 In recent flow meters, digital electronic technology has been applied to measure flow rates. For example, in gas, water, etc., a flow rate meter is used that detects the rotation of the impeller according to the amount used (flow rate), the flow rate, etc. as a pulse, and the microcomputer obtains information on the flow rate, flow rate, etc. The applicant of the present invention has also developed an electronic flow meter. An example is shown in FIG. In FIG. 2, when the impeller 104 arranged in the flow path 102 rotates due to the fluid pressure of water, the water magnet 100 rotates with the permanent magnet 106 fixed to the impeller 104. Changes occur. The data of the change in the magnetic field is processed by a microcomputer-controlled information processing circuit (not shown) including a Hall element or a magnetoresistive element housed in the measuring unit 108 to obtain information such as the amount of water and the flow velocity, and the display device 110 It can be displayed on. Since the information processing circuit can obtain a plurality of pieces of information such as the integrated flow rate, the flow velocity, and the current flow rate per unit time, it cannot be displayed on the small display device 110, and it is necessary to select information to be displayed from the outside. .. Therefore, a method is proposed in which the reed switch 112 is provided in the measuring unit 108, the permanent magnet 114 is brought close to the outside, and when the reed switch 112 is turned on, the information displayed on the display device 110 by the microcomputer is switched. Was done. The position of the reed switch 112 is printed or engraved with a colored mark at a corresponding position on the upper surface of the measuring unit 108 so that it can be seen from the outside.

[0003]

[Problems to be solved by the device]

 However, the above-mentioned conventional flow meter has the following problems. Water meters and the like are often installed in the soil, and the mark indicating the position of the lead switch 112 on the upper surface of the measuring unit 108 is often invisible, making it difficult to confirm the position. In particular, when the flow meter is provided in a deep place in a hole in the soil, it is extremely difficult to confirm the position of the reed switch 112, and sometimes the reed switch 112 cannot be operated properly. Therefore, an object of the present invention is to provide a flow meter that can easily confirm the position of a magnetic detection means such as a reed switch that detects the approach of a permanent magnet, and can reliably operate the magnetic detection means. To do.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has the following configuration. That is, an information processing circuit that measures a plurality of pieces of information such as a flow rate and a flow velocity of a fluid by measuring the rotation speed and the number of rotations of an impeller and a measurement unit that includes a display device that can selectively display the information, A magnetic detection unit arranged in the measuring unit for switching the information displayed on the display device each time the magnetism is detected, and an outer surface of the measuring unit corresponding to a portion where the magnetic detection unit is arranged. It is characterized in that it is provided with a recessed portion which is recessed at a position.

[0005]

[Action]

 The operation will be described. Since the concave portion is provided on the outer surface of the measuring portion at a position corresponding to the portion where the magnetic detecting means is arranged, even if the concave portion is difficult to see, feel groping or use some member. By searching and contacting the concave portion, the position of the magnetic detecting means can be easily detected.

[0006]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, an electronic flow meter will be described as an example of the flow meter. 1, reference numeral 10 denotes a housing, which includes a lower case 12, an inner case 14 fitted in the lower case 12, and an upper case 16 screwed onto an upper portion of the lower case 12. A water inlet 18 and a water outlet 20 are opened in the lower case 12, and a flow passage 22 that connects the water inlet 18 and the water outlet 20 is formed by fitting the inner case 14 therein. Reference numeral 24 denotes an impeller, which is rotatable about a shaft 26 provided upright in the flow path 22. A permanent magnet 28 is fixed to the upper end of the impeller 24.

Reference numeral 30 denotes a measuring unit, which is fitted and fixed in the inner case 14. The measuring unit 30 includes a Hall element, a reed switch, etc. that detect a change in the magnetic field due to the rotation of the permanent magnet 28 accompanying the rotation of the impeller 24. A microcomputer-controlled information processing circuit (not shown) that detects a plurality of items such as water flow rate and flow velocity, and a display device (for example, LCD) that the microcomputer outputs and displays the information obtained through the information processing circuit. 32, a reed switch 34, which is an example of magnetic detection means, and the like are incorporated. A transparent resin plate 36 is fitted on a portion of the upper surface of the measuring unit 30 corresponding to the LCD 32, so that the information displayed on the LCD 32 can be read. On the outer surface of the measuring unit 30 corresponding to the reed switch 34, a recess 38 formed in a hemisphere is formed and colored for easy viewing. This allows the user to detect the position of the reed switch 34 from the outside. The thickness of the outer surface of the measuring unit 30, including the depth of the recess 38, is set, for example, at the tip of the operating rod 40, and the lead switch 34 is set when the permanent magnet 42 having a predetermined magnetic force approaches the recess 38. Be sure to make it thick enough to operate.

Each time the reed switch 34 detects magnetism, a signal generating circuit (not shown) is turned on, a switching signal is sent to the microcomputer, and the microcomputer switches the information displayed on the LCD 32 each time. The operating rod 40 of the reed switch 34 has a permanent magnet 42 attached to the end of a rod 44 via a universal joint 46 so as to be suitable for switching the display of a water meter arranged in a hole in the soil. Moreover, the lower end surface of the permanent magnet 42 is always vertically downward due to its own weight. Further, the lower end surface of the permanent magnet 42 is provided with a projection 48 that can be fitted (i.e., loosely fitted) into the recess 38 formed in the outer surface of the measuring unit 30. Therefore, even when it is difficult to see the water meter in the hole, the user slides the permanent magnet 42 on the upper surface of the measurement unit 30 and inserts the projection 48 of the permanent magnet 42 into the recess 38 of the measurement unit 30. The recess 38 serves as a guide, and the permanent magnet 42 can be accurately guided onto the reed switch 34. Reference numeral 50 denotes a lid, which is attached to the upper case 16 so as to be rotatable around a shaft 52. When the lid portion 50 rotates in the direction of the arrow 54, the lid portion 50 can cover the upper surface of the upper case 16 and thus the entire upper surface of the measurement unit 30. The lid 50 prevents sediment from accumulating on the upper surface of the measuring unit 30, especially on the recess 38.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, the magnetic detecting means may be a Hall element instead of a reed switch. Of course, many more modifications can be made without departing from the spirit of the invention.

[0010]

[Effect of the device]

 When the flowmeter according to the present invention is used, since the concave portion is provided on the outer surface of the measuring portion at a position corresponding to the portion where the magnetic detecting means is arranged, the concave portion may be difficult to see. Also, the position of the magnetic detecting means can be easily detected by groping or searching using some member and making contact with the concave portion. As a result, even if the flow rate meter is installed in a place that is difficult to see, it is easy to check the position of the magnetic detection means, and it is possible to operate the magnetic detection means reliably. It is very effective.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a flow meter according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional flow meter.

[Explanation of symbols]

 24 Impeller 30 Measuring Unit 32 LCD 34 Reed Switch 38 Recess

Claims (1)

[Scope of utility model registration request] 1. An information processing circuit for measuring a rotational speed, a rotational speed, etc. of an impeller to obtain a plurality of pieces of information such as a flow rate and a flow velocity of a fluid, and a measuring unit having a display device capable of selectively displaying the information. And a magnetic detection means disposed in the measuring unit for switching information displayed on the display device each time the magnetism is detected, and a portion on the outer surface of the measuring unit where the magnetic detection unit is disposed. And a concave portion provided at a position corresponding to the flow rate meter.