CN86208469U

CN86208469U - Pneumatic film adjusting valve

Info

Publication number: CN86208469U
Application number: CN 86208469
Authority: CN
Inventors: 王昌烈; 颜金发; 方逢岐
Original assignee: FUYANG INST FITTINGS SHOP ZHEJIANG
Current assignee: Fuyang Automatic Meter Factory
Priority date: 1986-12-30
Filing date: 1986-12-30
Publication date: 1987-11-18

Abstract

The utility model relates to a pneumatic film adjusting valve, and a spring set is installed in a film chamber. An actuating mechanism and an adjusting mechanism are connected into the integration by a column type bracket, which reduces the weight and decreases the size. A uniform section homogeneous flow passage and a diverting rib arranged in a valve body are used to reduce the resistance force generated in the flow passage and improve the rated flow coefficient. The utility model can be widely used for automatic adjustment for temperatures, pressures, flow quantities and other parameters of the chemical industry, the petroleum, the metallurgy, the electric power and the light weaving industry.

Description

Pneumatic film adjusting valve

Pneumatic diaphragm control valve is a kind of actuator in the pneumatic unit combination instrument, it is one of important step in the production process automatic regulating system, it is accepted the output signal of regulation meter and closes or Open valve, reach the isoparametric automatic adjusting of pressure, temperature, flow and liquid level, can be widely used in the automatic adjusting and the telecontrol of chemical industry, oil, metallurgy, electric power, light textile industry.

At present existing pneumatic diaphragm control valve, has performance easy to use and explosion-proof, but following shortcoming is arranged: 1. come the balancing run signal to act on the power that produces on the rubber matrix with a spring, medium is to the reaction force of spool in the controlling mechanism, and diaphragm, valve rod, the friction at the weight of movable parts such as spool and filler place, be these power more than the balance, make essential Spring Steel Wire diameter that will be thicker, and there is one than long running length, the free height that is spring is longer, therefore, have to increase the stent length of holding spring, so cause the pneumatic diaphragm control valve size bigger than normal and heavy.2. rated flow coefficient is an important technology parameter of pneumatic diaphragm control valve, the resistance of original technology valve body is big, there is the hurried variation of sectional area on the flow path designs of main modulating valve, the corresponding increase of the local resistance that produces when making fluid pass through valve body, in the valve body cavity is arranged simultaneously, make to produce eddy current and cause resistance, thereby caused rated flow coefficient lower.So above-mentioned situation steel consumption in process of production is excessive, transportation, install and to have brought inconvenience, to some narrow and small workplace,, use and maintenance brings unfavorablely because pneumatic diaphragm control valve is too heavy tall and big, and rated flow coefficient is lower.

The purpose of this utility model is: be designed to the pneumatic diaphragm control valve that a kind of physical dimension is little, in light weight and rated flow coefficient increases at above-mentioned shortcoming.

The technical solution of the utility model: 1. with many (2～6) spring parallel connections, 1/n(n when the rigidity of every spring is single spring is the spring radical), therefore, Spring Steel Wire diameter and free height greatly reduce, the corresponding physical dimension small scale problem that solved; 2. owing to use many springs, make the spring miniaturization, spring can be placed among the film chamber, supporting structure is greatly simplified, and changes original cast iron bracket into 2～4 root post supports, not only has been convenient to processing, but also has saved material, reduces weight and reduces size; 3. the valve flowing channel of fluid is designed to the even runner of uniform section, reduces the resistance that runner produces; 4. in order to make the fluid cross-section that flows through before and after the valve seat can both keep approximately equal, and flow to and to change,, and relatively flow into and hold or outflow end so valve seat planes will be lower than flange center; 5. the shunting muscle is set in valve body.Fluid is by valve rod fluid to be divided into two-way and then to merge into one the tunnel entering valve seat before flowing into valve seat, therefore the two-way fluid can bump against when converging, consumption to energy is bigger, directly influenced the valve resistance coefficient, can make the preceding flow direction that changes of fluid inflow valve seat then enter valve seat and be provided with the shunting muscle, reduce the collision between the fluid, the resistance of valve is corresponding to be reduced.

The utility model embodiment:

Fig. 1 is a pneumatic diaphragm control valve air to close structural representation.

Fig. 2 is a pneumatic diaphragm control valve gas force open type structural representation.

Fig. 3 is the runner front view among Fig. 1.

Fig. 4 is the runner plan view among Fig. 1.

According to shown in Figure 1, pneumatic diaphragm control valve air to close structure is that cluster spring (2～6) (2) evenly is installed in down in the membrane cover (5) by circumferencial direction, when not having operation signal to enter, under this cluster spring effect, make diaphragm (4), valve rod (7), spool (9) upwards promotes, make spool (9) lift off a seat (12), when operation signal in hole (3) enter membrane cover (1), and act on above the diaphragm (4), to make diaphragm (4) together with valve rod (7), spool (9) moves down together, be pressed on the valve seat (12) until spool (9), close the fluid that flows into valve body (11).

By last membrane cover (1), cluster spring (2), diaphragm (4), the actuator that forms of membrane cover (5) down, make support with 2～4 φ 15～30mm columns, the controlling mechanism that valve rod (7), spool (9), valve seat (12) and valve body (11) are formed is formed one.In order to prevent that medium leaks outside between valve rod (7) and the valve body (11), use filler (8) to seal.

According to shown in Figure 4, the processing of shunting muscle (10) symmetry flows into the medium in the valve body (11) on valve body (11) center line both sides, goes up the shunting back at shunting muscle (10) and flows out valve body (11) again by valve seat (12).The utility model adopts the even runner valve body of uniform section conceptual design in addition, as shown in Figure 3, fluid is after the direction of arrow flows into valve body, progressively by cross section 1 '-1 ', 2 '-2 ' ... n '-1-n '-1, n '-n ' outflow valve body, establish 1 '-1 ', 2 '-2 ' ... n '-1-n '-1, n '-n ' sectional area everywhere is respectively F ₁, F ₂F _N-1, F _n, owing to be designed to even runner so F ₁≈ F ₂≈ ... F _N-1≈ F _n, know that by fluid mechanics principle fluid is by the corresponding resistance that is less than non-homogeneous runner of the resistance loss that even runner produced.According to modulating valve rated flow coefficient C=5.04F _n/

\sqrt{ξ}

At identical sectional area F _nDown, rated flow coefficient and valve resistance coefficient ξ square root are inversely proportional to, simultaneously because the homogeneous phase of runner should reduce the vortex.

Owing to make uniform flow passage, guarantee that fluid flows through before the valve seat and the sectional area behind the valve seat can both approximately equal, and flow to and progressively to change that the valve seat operative position will be lower than flange center, and relatively valve body flows into end or outflow end.

The utility model second embodiment: as shown in Figure 2, component and gas force closed type that the pneumatic diaphragm control valve gas force open type is used are general, only cluster spring (2～6) (2) evenly is installed in the membrane cover (1) by circumferencial direction, when not having operation signal to enter, under this cluster spring effect, make diaphragm (4), valve rod (7), spool (9) to pressing down, spool (9) is pressed on the valve seat (12).When operation signal in hole (3) enter down membrane cover (5), and act on diaphragm below, diaphragm (4) is moved up together with valve rod (7), spool (9), spool (9) is lifted off a seat (12), open the medium that flows into valve body (11).When this gas force open type modulating valve was installed, " O " type circle (13) was put in the cooperation place of following membrane cover and valve rod (7), leaks outside with the gas that prevents operation signal.

Rated flow coefficient of the present utility model improves about 40% than original technology, and height and weight respectively reduce about 35%.

Claims

1, a kind of pneumatic diaphragm control valve of being formed by last membrane cover [1], following membrane cover [5], diaphragm [4], spring [2], support [7], valve body [11], spool [9], valve seat [12], it is characterized in that a. cluster spring (2～6) [2], evenly be installed in up and down among the membrane cover [1] and [5] by circumferencial direction, b. the sectional area everywhere of valve body [11] runner is near equating, c. valve seat [12] plan-position is lower than flange center, and relatively valve body flows into end or outflow end, d. valve body [11] center line both sides are arranged with the shunting muscle.

2, pneumatic diaphragm control valve according to claim 1 is characterized in that air to close evenly is installed in down cluster spring (2) in the membrane cover (5) by circumferencial direction.

3, pneumatic diaphragm control valve according to claim 1 is characterized in that gas force open type with cluster spring (2), evenly is installed in the membrane cover (1) by circumferencial direction.

4, pneumatic diaphragm control valve according to claim 1, it is characterized in that the actuator that membrane cover (1), cluster spring (2), diaphragm (4), following membrane cover (5) are formed, make support with 2～4 φ 15～30mm columns, make valve rod (7), spool (9), valve seat (12) and valve body (11) institute composition controlling mechanism form one.