CN101403550A

CN101403550A - Miniature pneumatic pressure balancer

Info

Publication number: CN101403550A
Application number: CNA2008102029210A
Authority: CN
Inventors: 武卫东; 庞常伟; 庞尚志; 郭永飞; 刘辉
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2008-11-18
Filing date: 2008-11-18
Publication date: 2009-04-08
Anticipated expiration: 2028-11-18
Also published as: CN101403550B

Abstract

The invention relates to a small-sized pneumatic pressure balancer, comprising a pressure balancing part and a pressure feedback part. The small-sized pneumatic pressure balancer is characterized in that: compressed nitrogen is adopted as the power source of pressure balancing; an electromagnetic valve is used for controlling the nitrogen which enters a steel pipe and acts on a rubber plate; the rubber plate then acts on the wall surfaces of a vessel to realize the balance between the pressures in and out of the vessel. With simple structure, excellent flexibility, easy control of exerted pressure and simple as well as convenient operation, the small-sized pneumatic pressure balancer is suitable for the pressure balancing in the visual absorption test equipment. Meanwhile, the small-sized pneumatic pressure balancer can also play a role in balancing the internal pressure for vessels incapable of bearing the excessive internal pressure, and in particular to vessels of easy transformation and device systems with vessels of changed internal pressure.

Description

Miniature pneumatic pressure balancer

Technical field

The present invention relates to a kind of pressurizer, particularly a kind of miniature pneumatic pressure balancer.

Background technology

Absorption refrigeration utilizes used heat, waste heat or solar energy as power source, demonstrates fully energy-conservation superiority.In absorption refrigerator, absorber is a very crucial element, and it has very big influence to absorption efficiency, but also is the key factor that influences COP.Therefore the experimental study around absorber just actively launches.

In the experimental study, absorber is designed to the cuboid formula sometimes, in order to be convenient to observe liquid level in the absorber and the internal solution situation of change that flows in testing, glass plate is loaded onto on the two sides of absorber, and with colloid with its adhering and sealing.Yet the glass plate bearing capacity is limited, and the used colloid of adhering glass plate does not allow to split yet, and reveals otherwise produce, and is unfavorable for the stable operation of system, so container internal pressure is restricted.For head it off, pressurizer can be acted on and realize the container internal and external pressure balance on the glass plate, reach the purpose that internal tank can bear big pressure then.If act on the glass plate, because defective such as poor in flexibility, glass plate unbalance stress, pressure be wayward makes the rigidity clamping device to use herein but use the rigidity clamping device.

Summary of the invention

The present invention be directed to the existing uppity problem of experiment container pressure, propose a kind of miniature pneumatic pressure balancer, solved some and be easy to generate the pressure control problem of the container and the apparatus system that some container internal pressures change in time of distortion.

Technical scheme of the present invention is: a kind of miniature pneumatic pressure balancer, comprise two rubber slabs 1,11, two

scalable rubber tubes

2,12, two

steel pipes

3,10, screw 5, handle 6, spring 7, flexible pipe 9, the equalizing pressure part that hose connection 8 is formed, two

steel pipes

3,10 afterbodys connect handle 6 two ends, handle 6 is connected by spring 7, screw 5 is spacing, two

steel pipes

3,10 inside are connected with flexible pipe 9 by hose connection 8, make two

steel pipes

3,10 inner conductings, two

steel pipes

3,10 heads are respectively by

scalable rubber tube

2,12 with rubber slab 1,11 connect, two blocks of rubber slabs 1, the 11 parallel containers that press from both sides, also comprise magnetic valve 13, nitrogen cylinder 14, the pressure feedback part that differential pressure controller 15 is formed, nitrogen cylinder 14 is by magnetic valve 13 and

steel pipe

3,10 internal communication, differential pressure controller 15 and two

steel pipes

3,10, be connected control magnetic valve 13 Push And Releases by pressure vessel 16.

Differential pressure controller 15 is set a pressure difference, and this setting pressure difference Δ Pc is P ₁Function, work as P ₁When constant, Δ Pc is a definite value; Work as P ₁During variation, Δ Pc is also with P ₁Change, wherein P ₁For by pressure vessel internal pressure value.

Described two steel pipes, 3,10 any last safety valves 4 of installing.

Beneficial effect of the present invention is: miniature pneumatic pressure balancer of the present invention, and solved for general rigidity clamping device and should not use, need the stress problems of the container of balance internal pressure again, guaranteed the security that container uses.Have simple in structurely, pliability is good, institute's control easily of exerting pressure, characteristics easy and simple to handle.

Description of drawings

Fig. 1 miniature pneumatic pressure balancer structural representation of the present invention;

Fig. 2 miniature pneumatic pressure balancer Pneumatic pressure of the present invention acts on by the pressure vessel schematic diagram;

Conduct is by the cuboid formula container schematic diagram of pressure vessel in Fig. 3 miniature pneumatic pressure balancer of the present invention.

The specific embodiment

As Fig. 1 miniature pneumatic pressure balancer structural representation of the present invention, system mainly is made up of two parts.First comprises two rubber slabs 1,11, two

scalable rubber tubes

2,12, two

steel pipes

3,10, screw 5, handle 6, spring 7, flexible pipe 9, hose connection 8, they are combined and play balance by the effect of pressure vessel internal pressure, two

steel pipes

3,10 inside are connected with flexible pipe 9 by hose connection 8, make two

steel pipes

3,10 inner conductings, two

steel pipes

3,10 heads are respectively by

scalable rubber tube

2,12 with rubber slab 1,11 connect two blocks of rubber slabs 1,11 is parallel; Second portion comprises magnetic valve 13, nitrogen cylinder 14, differential pressure controller 15, they combine the effect of playing pressure feedback, nitrogen cylinder is communicated with steel duct by magnetic valve, pressure controller is with steel pipe, be connected by pressure vessel, control magnetic valve Push And Release, these two parts have constituted the Pneumatic pressure balance sysmte together.

The miniature pneumatic pressure balancer Pneumatic pressure acts on by the pressure vessel schematic diagram as shown in Figure 2, this miniature pneumatic pressure balancer is to utilize compressed nitrogen as power source, entering steel pipe by magnetic valve 13 control nitrogen acts on the rubber slab 1,11, act on active force on 16 liang of walls of container by rubber slab again, realize the container internal and external pressure balance.In the pressure feedback system, set a pressure difference by differential pressure controller 15, this setting pressure difference is by being formed by gas differential pressure in gas in the pressure vessel 16 and the

steel pipe

3,10, when being risen by pressure vessel 16 internal pressures, the actual pressure differential value is less than setting pressure difference, at this moment, magnetic valve 13 is open-minded, nitrogen in the nitrogen cylinder 14 is pressed into steel pipe, gas pressure increases in the steel pipe,

scalable rubber tube

2,12 has a little elongation, and the pressure that rubber slab 1,11 acts on container 16 top and bottom increases, and is accompanied by that gas differential pressure increases gradually between steel pipe and container.When pressure reduction increases to when setting pressure difference and equate, magnetic valve 13 cuts out, and nitrogen stops to enter steel pipe, and it is stable that the steel pipe internal pressure keeps.

Is example as conduct among Fig. 3 by the cuboid formula container of pressure vessel, analyzes the pressure balance process.

The screw 5 of at first outwarding winding makes the distance of 1,11 of two rubber slabs increase by spring 7 effects, two rubber slabs 1,11 is clipped in gently the ABB of container 16 ₁A ₁Face and DCC ₁D ₁On the face, then screw 5 is screwed, guarantee two rubber slabs and container A BB ₁A ₁Face and DCC ₁D ₁Face well contacts.When container 16 internal pressures changed, by the differential pressure controller correlation, the Push And Release of control magnetic valve 13 was realized the adjusting of steel pipe internal pressure then.

The setting pressure difference is analyzed:

Suppose that two rubber slabs 1,11 act on container A BB respectively ₁A ₁Face and DCC ₁D ₁Face, setting pressure difference is Δ Pc, and the steel pipe internal pressure is P, and environmental pressure is P _O, container A BCD-A ₁B ₁C ₁D ₁Internal pressure is P ₁, rubber slab is to container A BB ₁A ₁The amount of force of face is N, container A BB ₁A ₁The area of face is S, and the rubber slab radius is R, when the container internal and external pressure balance:

For the rubber slab face, have according to stress balance in the horizontal direction:

N-PπR ²＝0

Had: N=P π R ²

For ABB ₁A ₁Face has according to stress balance in the horizontal direction:

P ₁S-P _O(S-πR ²)-N＝0

That is: P ₁S-P _O(S-π R ²)-P π R ²=0

Had: P=(P ₁-P _O) S/ (π R ²)+P _O

So, set pressure difference: Δ Pc=P-P ₁

＝(P ₁-P _O)S/(πR ²)+P _O-P ₁

＝(P ₁-P _O)(S-πR ²)/(πR ²)

Know that by following formula setting pressure difference Δ Pc is container 16 internal pressure P ₁Function, work as P ₁When constant, Δ Pc is a definite value; Work as P ₁During variation, Δ Pc is also with P ₁Change.

The related control of differential pressure controller magnetic valve:

When actual pressure differential value Δ P and setting pressure difference Δ Pc are unequal, by the differential pressure controller effect, making magnetic valve carry out switch, is three kinds of states of its effect below:

I is when Δ P＜Δ Pc, and magnetic valve is open-minded

II when Δ P=Δ Pc, closed electromagnetic valve

III when Δ P＞Δ Pc, closed electromagnetic valve, if the steel pipe internal pressure reaches certain value, when system stable operation is impacted, safety valve will be opened, and reduce the steel pipe internal pressure, when reaching Δ P and equating with Δ Pc, safety valve cuts out.

The device element function:

It (is ABB by pressure surface that rubber slab 1,11 helps in time pressure being passed to container ₁A ₁Face and DCC ₁D ₁Face); The scalability of

scalable rubber tube

2,12 makes nitrogen easily to being produced Pneumatic pressure by pressure vessel;

Steel pipe

3,10 serves as gas container and plays the effect of securing device; When safety valve 4 guarantees that the steel pipe internal pressure is excessive, discharge some nitrogen to reduce pressure; Spring 7 is used for realizing transferring the aperture between big two rubber slabs, and the effect of screw 5 is the distances of fixing between two rubber slabs, makes whole system become stable under 5 and 7 the effect simultaneously; Flexible pipe 9 is communicated with two steel pipes by two hose connections 8, and its length can suitably be regulated, and guarantees between two rubber slabs that distance changes and can not influence that gas communicates in two steel pipes; Magnetic valve 13 is pressed into steel pipe with the nitrogen in the nitrogen cylinder, realizes supercharging in the steel pipe; After differential pressure controller 15 recorded pressure reduction in container and the steel pipe, related control magnetic valve was carried out pressure reduction and is regulated.

Claims

1, a kind of miniature pneumatic pressure balancer, comprise two rubber slabs (1,11), two scalable rubber tubes (2,12), two steel pipes (3,10), screw (5), handle (6), spring (7), flexible pipe (9), the equalizing pressure part that hose connection (8) is formed, two steel pipes (3,10) afterbody connects handle (6) two ends, handle (6) is connected by spring (7), screw (5) is spacing, two steel pipes (3,10) inside is connected with flexible pipe (9) by hose connection (8), make two steel pipes (3,10) inner conducting, two steel pipes (3,10) head is respectively by scalable rubber tube (2,12) with rubber slab (1,11) connect, two blocks of rubber slabs (1,11) the parallel container that presss from both sides, it is characterized in that, also comprise magnetic valve (13), nitrogen cylinder (14), differential pressure controller (15) decomposition pressure feedback fraction, nitrogen cylinder (14) is by magnetic valve (13) and steel pipe (3,10) internal communication, differential pressure controller (15) and two steel pipes (3,10), be connected control magnetic valve (13) Push And Release by pressure vessel (16).

According to the described miniature pneumatic pressure balancer of claim 1, it is characterized in that 2, differential pressure controller (15) is set a pressure difference, this setting pressure difference Δ Pc is P ₁Function, work as P ₁When constant, Δ Pc is a definite value; Work as P ₁During variation, Δ Pc is also with P ₁Change, wherein P ₁For by pressure vessel internal pressure value.

According to the described miniature pneumatic pressure balancer of claim 1, it is characterized in that 3, any one of described two steel pipes (3,10) are gone up installation one safety valve (4).