CN1041220A

CN1041220A - Lower-limit pressure indicator for liquified gas tank

Info

Publication number: CN1041220A
Application number: CN 88106437
Authority: CN
Inventors: 尹蓝宁
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-09-17
Filing date: 1988-09-17
Publication date: 1990-04-11

Abstract

Lower-limit pressure indicator for liquified gas tank is mounted on the reduction valve of liquefied gas apparatus, be used to show the indicating instrument of household liquified bottle threshold pression reserves, its design feature is that screw putter and stem gear are slidingly connected, the rotation of drive pointer, this table has and does not contact inflammable gas fully, advantage simple in structure, safe in utilization.

Description

Lower-limit pressure indicator for liquified gas tank

Lower-limit pressure indicator for liquified gas tank belongs to mechanical quantity detection technique field, is the indicating instrument that is used to show household liquified bottle threshold pression reserves.

Before this, existing many liquefied gas reserves indicators occur, its structure is nothing more than two kinds of forms, a kind of is that gas cylinder is carried out weighing, another kind is to change existing reliever, because liquid weight and the often disproportionate relation of pressure of the inside of a bottle in the gas cylinder, therefore, the difficulty of weight method is conspicuous.Be divided into from the angle of manufacturer and change and change and change existing reliever from user's angle, thereby the difficulty of two aspects arranged also: it is more to be for manufacturer that prior art increases cost, the manufacturing process of carrying out deep processing on the basis of original reliever is immature, and it is complicated to do manual work; For the user is that prior art relates to national departments concerned and forbids that the user changes the reliever structure, avoid taking place the relevant regulations of unsafe factor, purpose of the present invention just is to provide a kind of and is transferred by manufacturer production, avoid that the user is dried to give, substantially do not change the reliever original structure, do not influence the reliever original function, simple in structure again, can clearly illustrate the indicating instrument of jar interior threshold pression.

Fig. 1 is the sectional view of original reliever 1 to 1, and wherein symbol description is as follows:

(1) loam cake (2) pressure regulating screw (3) pressing spring (4) trip bolt (5) clamp nut (6) leverage (7) rotating shaft (8) push rod (9) pressure-bearing reed (10) diaphragm.

Fig. 2 is screw putter 2 to 1 sectional views, and garden shape partly is its top view.

Fig. 3 is the sectional view of the indication gauge outfit of threshold pression indicating gauge, and wherein symbol description is as follows:

(1) the transparent table of scale dial plate (2) indication indicator (3) covers (4) pinion wheel (5) stem gear (6) hold-down nut.

The ultimate principle of this indicating gauge is as follows:

Because the reduction valve in the liquefied gas apparatus has the control characteristic of self, this has determined the diaphragm position of reduction valve also to have certain movement law, it shows as: in a very long time after the liquefied gas bottle of canful comes into operation, the diaphragm position of reduction valve is higher always; After liquefied gas bottle used a period of time, the diaphragm position of reduction valve began to descend, and surveyed not decline of top hole pressure at this moment, and reduction valve is still being regulated; The diaphragm position is along with the continuous decline that reduces of pressure of the inside of a bottle from now on, and to drop to reduction valve out of control always, and at this moment the top hole pressure of reduction valve just begins to descend, and flame just begins to weaken on the kitchen range; This begins to quicken to descend up to extreme lower position with rear film, and at this moment flame can only have been heated up water on the kitchen range.So, if the pressure zone when we have just begun the diaphragm position of reduction valve to descend in the jar bottle calls " threshold pression district ", from diaphragm, just can take out corresponding pressure signal at an easy rate so, in fact have only this section pressure zone to be only the place of users' real concern, so, problem obtains simplifying thus, as long as we convert displacement signal downward on the diaphragm to the swing offset amount of pointer.The change value of pressure in this " threshold pression district " just can have been read from dial plate at an easy rate.

Concrete implementing method is as follows:

Earlier reliever is transformed a little with reference to Fig. 1, the loam cake (1) of reliever among Fig. 1 is removed, again the clamp nut on the diaphragm (5) is removed, change the screw putter on Fig. 2, diameter of the centre drill of the pressure regulating screw in Fig. 1 (2) hole consistent then with the screw putter on Fig. 2, so that the screw putter on the new clothes can pass from the hole, more drilled pressure regulating screw (2) is screwed in again.

With reference to Fig. 1 Fig. 2 Fig. 3, the reliever upper end of threshold pression indicating gauge shown in Figure 3 having been removed loam cake (1) from Fig. 1 screws in downwards, make the top that is contained in the screw putter among Fig. 1 and pinion wheel one end in contact of the stem gear among Fig. 3 (5), it is bigger that the two is designed to helix angle, the form that lead angle is less.So that the upper and lower displacement conversion of signals of diaphragm among Fig. 1 (10) is become the swing offset signal of middle stem gear (5) among Fig. 4, length with axial stroke obtains certain angle of revolution, stem gear (5) rotates with the gear (4) that certain speed ratio drives on Fig. 3 again, make with Fig. 3 on the coaxial pointer (2) of gear (4) produce 270 corners of spending, on dial plate (1), indicate corresponding force value.

The described hold-down nut of Fig. 3 (6) is used for regulating this table height and fastening table in reliever, in order not influence the adjusting of pressure regulating screw shown in Figure 1 (2) to static pressure, manufacturer or liquefied gas administrative authority can make interdigital simple specific purpose tool and operate, earlier static pressure is mixed up and refill gauge outfit, make the top of the screw putter on Fig. 2 touch stem gear (5) on Fig. 3 (this moment pointer can along with rotating), the hold-down nut blended rubber that screws then on Fig. 3 is sealed, screwing off table at last covers, not having under the situation of pressure indicator to be pushed zero place, screw on the table illiteracy again and get final product.

Fig. 4 is the reduction valve that has installed the threshold pression indicating gauge.

Fig. 5 locates the continuous burning curve map (two kitchen range standard-sized sheets are to maximum) that data that pressure chamber's threshold pression indicating gauge and U-shaped pipe differential pressure gauge make are drawn according to the china institute of metrology thermal technology.Horizontal ordinate is the time among the figure, and unit is hour, and ordinate is the corner Q of top hole pressure P2 and threshold pression indicating gauge, and the unit of P2 is the millimeter of water, the unit degree of being of Q.

As can see from Figure 5: this table can begin to indicate the pressure downward trend before about 5 hours of reduction valve top hole pressure drop point (B point).

The advantage and disadvantage of this dial gauge is:

Volume simple in structure is little, does not need the energy, does not contact fuel gas, production safeguards that by debuging examination reading is directly perceived easily, can not cause gas leakage owing to be contained in the diaphragm top, can not touch fuel gas and be subjected to the corrosion of fuel gas, and can be used for leak test.

Claims

Lower-limit pressure indicator for liquified gas tank is the mechanical type indicating instrument that directly diaphragm of reduction valve taking-up signal driven gear mechanism and pointer rotate from have the liquefied gas apparatus now, it is characterized in that:

1, power resources are in the diaphragm of reduction valve.

2, gear mechanism adopts stem gear (5) and screw putter to be slidingly connected.

3, indicating section comprises indicator (2) and is printed on the dial plate (1) of threshold pression district and zone of alarm.