CN2073149U

CN2073149U - Discharger

Info

Publication number: CN2073149U
Application number: CN 90220422
Authority: CN
Inventors: 莫湖
Original assignee: Beijing Xicheng District Newly Opened General Test Plant
Current assignee: Beijing Xicheng District Newly Opened General Test Plant
Priority date: 1990-09-19
Filing date: 1990-09-19
Publication date: 1991-03-13

Abstract

The utility model discloses a discharger, which is used for protecting the sensing elements in a differential pressure transducer from damaging in the industrial process control. The structure of the discharger is that two U-shaped casings are respectively fixedly connected to the two sides of a flat partition board whose middle is provided with a conic through hole, and two sealing cavities are formed; the two side surfaces of the flat partition board are respectively adhered with one layer of aluminum foil; each casing is provided with a bolt hole which can enable the sealing cavities and the fluid pipelines with difference pressure to form passages. The utility model which has simple structure, easy fabrication, and reliable work can be connected with a sensor in parallel as a single product as well as can be arranged in the sensor as a part to play the action.

Description

Discharger

The utility model relates to a kind of emptier that is used for protecting the differential pressure pick-up sensitive element, belongs to the base components technical field in the electromechanical integration industrial automation control system.

Using in industrial process control system has panoramic sensor, and wherein also the sensor with other kinds is the same for the differential pressure pick-up of measurement gas or fluid pressure, adopts electronic devices and components to replace traditional mechanical type sensing functional element more and more.The force-sensing parts that the applying silicon diaphragm is made in the differential pressure sensory field is just enough in formation and development as the trend of position-sensing unit.But the overload capacity of silicon diaphragm is very low, in case careless manipulation causes apparatus overload, the range tolerance band that exceeds sensor just is easy to cause device damage.And accurate differential pressure pick-up is very expensive, for example, Japanese North Star motor make DPF110 type electronics differential pressure pickup, its range is-1～100kgf/cm ², about 300,000 yen of price.Homemade differential pressure pick-up price is also wanted hundreds of units～thousands of units.(referring to, " the 160th page of practical sensor handbook electronics industry version).In case the damage sensor not only influences commercial production, its maintenance and repair also are the things that part is taken a lot of work and mistaken and spend the big worry of expense.

The purpose of this utility model is that a kind of differential pressure pick-up of protecting of design exempts from overload impact, meets overload and can make its automatic unloading when occurring, thereby prevent the emptier that force-sensing parts damages in the sensor.

Structure of the present utility model as shown in Figure 1, it is by housing 1,2, dividing plate 3, diaphragm 4, packing washer 5 formed.Two housings 1,2 that are the U type are fastenedly connected respectively its middle both sides that the flat partition board 3 of a cone-shaped hole 6 is arranged; form two sealed cavities; on two sides of flat partition board 3, be pasted with layer of metal protective film sheet 4 respectively; packing washer 5 also is equipped with in junction at housing 1,2 and flat partition board 3, respectively has a fluid circuit that is used to make its sealed cavity and two different pressures to constitute the aperture 7 of path on each housing.Wherein protect diaphragm 4 to make with aluminium foil, its thickness is selected between 0.1～0.2 millimeter.The centre of flat partition board 3 is cone-shaped holes 6, and its diameter is to require to be processed into different size dimension series according to different unloading pressures, is equipped with the aluminium foil of suitable thickness again, just can make the approved product that adapts to different unloading pressure conditions.

The mode of action of the present utility model and principle of work can 2 be introduced in conjunction with the accompanying drawings.10 is differential pressure sensors among Fig. 2, the 11st, the low-pressure fluid pipeline, the 12nd, the high-pressure fluid pipeline, the 13rd, with the differential pressure pick-up the utility model emptier that inserts the fluid circuit of different pressures in parallel, and it should insert the place in the more close fluid operating pressure of ratio sensor source.14 is the pipe valve on being connected on two paths of emptier and sensor respectively.The fluid circuit of 11 and 12 two different pressures, when the hydrodynamic pressure in it did not exceed rated load, emptier was failure to actuate, normal operation of sensor.In case pressure no to scale scope in the pipeline; the emptier of supporting setting will react action: the protection diaphragm of both sides, hole, flat partition board garden is oppressed breaking; make the conical bore of two fluids in the endoceliac different pressures pipeline of shell on flat partition board constitute bypass unloading step-down; thereby avoid the force-sensing parts of 10 li of differential pressure pick-ups to suffer damage, finish the utility model purpose.

Emptier action can not restore to the original state after crushing the protection diaphragm automatically, must unload it from working line, and installation in position again behind the protective film that more renews again just can make sensor recover operate as normal.Normally when abuse and process conditions; just can destroy nominal situation; cause overloading and emptier action rupture disc; so; in case after finding the utility model action, at first should find out the foundation of fault; get rid of after incorrect operating conditions and the technology trouble, change the protection diaphragm again and reinstall emptier, could guarantee that working sensor is normal and avoid emptier repetitive operation once more.

The utility model is simple in structure, and handling ease is with low cost, reliable operation.It both can be used as the independent product test pipeline (as shown in Figure 2) that is loaded on simultaneously in parallel with differential pressure pick-up, and the annex or the parts that also can be used as force-sensing sensor are contained in the differential pressure pick-up the inside, and its effect is good equally, can realize the utility model intention.

Claims

1, a kind of emptier that is used for protecting the differential pressure pick-up sensitive element; it is characterized in that it is made up of housing, dividing plate, diaphragm and packing washer; two housings that are the U type are fastenedly connected respectively its middle both sides that a dividing plate of a cone-shaped hole is arranged; form two sealed cavities; on two sides of flat partition board, closely be pasted with layer of metal protection diaphragm respectively; packing washer also is equipped with in junction at the housing flat partition board, respectively has one to be used to make its sealed cavity and fluid circuit to constitute the aperture of path on each and housing.

2, emptier as claimed in claim 1 is characterized in that the metal coating diaphragm can make with aluminium foil, and its thickness is between 0.1～0.2 millimeter.

3, emptier as claimed in claim 1 is characterized in that the diameter of the cone-shaped hole that flat partition board is middle can require to be processed into different size dimension series according to different unloading pressures.