CN2536997Y

CN2536997Y - Flow signal transducer for flow metering

Info

Publication number: CN2536997Y
Application number: CN 01259077
Authority: CN
Inventors: 陈德州; 张建国
Original assignee: LIANYI WEIHUA HIGH TECHNOLOGIES Co Ltd DAQING CITY
Current assignee: LIANYI WEIHUA HIGH TECHNOLOGIES Co Ltd DAQING CITY
Priority date: 2001-09-14
Filing date: 2001-09-14
Publication date: 2003-02-19
Anticipated expiration: 2011-09-14

Abstract

The utility model relates to a converter device of flow signal, belonging to the field of fluid measurement, which comprises an elastic conductive contactor of needle shape or flaky shape and a circular shaft with conductive layer attached outside; wherein the conductive layer has a certain length in the direction of the circumference of the circular shaft; the elastic contactor, which is connected with the circular shaft with conductive layer attached outside through line contact or point contact, always has a pressure on the circular shaft. When the outside mechanical movement drives the circular shaft to rotate around a central axis, the external conductive layer of the circular shaft will contact with or break contact with the elastic conductive contactor periodically, which enables the elastic conductive contactor break-over and break contact periodically and finally realizes the conversion from mechanical movement into the signal of the quantity of electricity. The utility model has the advantages of accurate measurement, no interference from magnetic field, small influence on the measuring precision of the measuring instrument, low power consumption and simple technology, being suitable for the pre-charging field.

Description

The flow signal conversion equipment that is used for the fluid metering field

Technical field

The utility model relates to a kind of flow signal conversion equipment that is used for the fluid metering field.

Background technology

In the fluid metering field, when measurement instrument work, when the external world will sample to it, need convert the mechanical signal of measurement instrument to electric quantity signal, discern to offer external circuit.Three kinds of conversion equipments that the flow signal conversion equipment that use in present this field mainly contains mechanical microswitch, tongue tube and utilizes photoelectricity transformation principle wherein are most widely used in the metering field of prepaid field with tongue tube.The tongue tube switching device is to adopt magnetic principle of operation to carry out conversion of signals, during its work, being installed in the part of mechanical switch or motion has a little magnet steel, and when rotating or the part of motion when driving little magnet steel motion near tongue tube, two contacts with magnetic in the tongue tube will contact, when little magnet steel moves at a distance, two contacts in the tongue tube separate again, thereby finish the collection of a signal, and so forth, little magnet steel is every near tongue tube once, with regard to once sampling; Because this body structure of tongue tube and work, when tongue tube work, the contact of its two magnetic very easily was subjected to the interference of external magnetic field, caused when little magnet steel during near tongue tube, and two interior contacts of tongue tube will contact, thereby cause the signals collecting inefficacy.In addition, the resistance of mechanical microswitch own is big, and is very big to the measuring accuracy influence of the accurate measurement instrument of working of palpus, causes measurement deviation serious; Utilize the device of photovoltaic principals, because of its principle of work, self power consumption is big, and technology is loaded down with trivial details, and the price height does not utilize on a large scale and promotes the use of.

The utility model content

The purpose of this utility model is to provide a kind of not external magnetic field to disturb, and little to the measuring accuracy influence of gauging table, not power consumption and process structure simply are used for the flow signal conversion equipment in fluid metering field.

The utility model is formed with the circular shaft with conductive layer by having the elastic conduction contact, be attached to the outer conductive layer of circular shaft and have respective length at the circumferencial direction of circular shaft, spring contact remains certain pressure on circular shaft, and adopts line to contact each other or the some contact with the circular shaft of having conductive layer; The elastic conduction contact is two, three, four or more, specifically looks the outer signals demand and different, and the shape of elastic conduction contact can be the thread or sheet of pin.During the utility model work, extraneous mechanical motion drives circular shaft around its central axis rotation, like this, skin on the circular shaft will periodically contact with the elastic conduction contact and disconnect, thereby make periodically conducting and disconnection between the elastic conduction contact, realization converts mechanical rotation the work of electric quantity signal to, discerns to external circuit so that electric signal to be provided.

The advantage that the utility model compared with prior art has is as follows:

1. accurate measurement is not subjected to magnetic interference, and has vibration proof and anlistatig function;

2. little to the measuring accuracy influence of gauging table;

3. not power consumption, and technology is simple, is particularly suitable for making conversion of signals in the measurement instrument of prepaid field

Use.

Description of drawings

Fig. 1 is a structural front view of the present utility model;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the structure vertical view of the utility model elastic conduction contact when adopting three;

Fig. 4 is the structure vertical view of the utility model elastic conduction contact when adopting four;

Three-dimensional structure diagram when Fig. 5 adopts sheet for the utility model elastic conductive component;

Fig. 6 for the utility model center coiling in the direction of the clock or the stereographic map when counterclockwise rotating.

Embodiment

Referring to accompanying drawing 1,2,3,4,5,6, present embodiment is made up of with the circular shaft 2 with conductive layer 3 the elastic conduction contact 1 of pin thread (seeing figure attached 2) or sheet (seeing accompanying drawing 5), conductive layer 2 on the circular shaft 2 has corresponding length in the circumferencial direction design, elastic conduction contact 1 remains certain pressure on circular shaft, and and with being in contact with one another between the circular shaft 3 of conductive layer 2, when elastic conduction contact 1 adopts pin thread, it with circular shaft 2 between adopt point to contact, when elastic conduction contact 1 adopts sheet, it with circular shaft 2 between the employing line contact; Elastic conduction contact 1 can adopt two (seeing accompanying drawing 2), three (seeing accompanying drawing 3) or four different types such as (seeing accompanying drawing 4), specifically look the outer signals demand and different, the output terminal of elastic conduction contact 1 is guided to the outside by lead, with the output electric quantity signal.

During the work of this device, extraneous mechanical motion drives circular shaft 2 around its central axis rotation, like this, the conductive layer 3 that has certain-length on the circumference of circular shaft is also just along with circular shaft rotates, when conductive layer 3 turns to wherein position in the elastic conduction contact 1, this contact promptly with conductive layer 3 conductings, and along with the rotation of conductive layer 3, this contact is remaining with conductive layer 3 and is contacting dynamically, i.e. conducting; Because conductive layer 3 has corresponding length on the circumference of circular shaft 2, so, continuous rotation along with conductive layer 3, at conductive layer 3 with when first contact contacts, conductive layer 3 will contact with second contact, thereby make second contact also contact conducting with conductive layer 3, and finally make conducting between two contacts, then, along with the rotation of circular shaft 2, conductive layer 3 disconnects with first contact earlier, then, disconnect with second contact, thereby, the conversion work that one-time mechanical converts electric signal to finally finished.Because the parts of this chromacoder are all nonmagnetic, so the work of device is not subjected to the interference of external magnetic field fully.In addition, this special structure based on a little kinds of devices: first, elastic conduction contact 1 is little with the contact area of conductive layer 3, second, circle diameter with conductive layer 3 can be made lessly, the 3rd, conductive contact 1 all can be done very smoothly with circumferential surface, according to the computing formula of physics: the computing formula of F=μ N and moment of torsion: M=FR about friction force, in the time of can drawing the circular shaft rotation, conductive contact to the resistance moment of torsion of circular shaft 2 is: M=μ NR, wherein, M is the resistance moment of torsion of a conductive contact to circular shaft 2, μ is the friction factor of conductive contact to the circular shaft surface, and both surfaces are smooth more, and the μ value is more little, N is the contact pressure of conductive contact to circular shaft 2 surfaces, because the conductive contact 1 that we adopt is to have a fine flexible part, so, the N value is very little, R rotates the circular shaft radius exactly in addition, and its value is also very little, as seen from the above analysis, the M value is very little, just contact is very little to the resistance moment of torsion that rotates circular shaft, thereby draws, and this device rotates easily, influence to outside mechanical system is minimum, can not influence the measuring accuracy of gauging table.

The novel extraneous high-intensity magnetic field that is subject to of tongue tube of having avoided fully of this usefulness disturbs and the conventional mechanical switch all drawback big to outside mechanical system resistance, and it is easy to manufacture, cheap, has use value.

Claims

1, the flow signal conversion equipment that is used for the fluid metering field, it is characterized in that: have the elastic conduction contact and form with circular shaft with conductive layer, be attached to the outer conductive layer of circular shaft and have respective length at the circumferencial direction of circular shaft, spring contact remains certain pressure on circular shaft, and adopts line to contact each other or the some contact with the circular shaft of having conductive layer.

2, the flow signal conversion equipment that is used for the fluid metering field according to claim 1 is characterized in that: above-mentioned elastic conduction contact is two, three, four.

3, the flow signal conversion equipment that is used for the fluid metering field according to claim 1 is characterized in that: above-mentioned elastic conduction contact shape is the thread or sheet of pin.