CN1038158C

CN1038158C - Pressure self-adaption float

Info

Publication number: CN1038158C
Application number: CN93117962A
Authority: CN
Inventors: 陈明海
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-29
Filing date: 1993-09-29
Publication date: 1998-04-22
Anticipated expiration: 2013-09-29
Also published as: CN1101111A

Abstract

The present invention discloses a pressure self-adapting float which comprises a float body (1), a liquid-proof device (2) and a communicating pipe (3), wherein the liquid-proof device is a hollow cavity and is arranged above the float body (1), and the lower part of the liquid-proof device is provided with a hole (4); the communicating pipe (3) is tightly connected with the float body (1), the lower end of the communicating pipe (3) is arranged in the cavity of the float body (1), and the upper end of the communicating pipe (3) is arranged in the cavity of the liquid-proof device (2) and is high than the hole (4); the inner cavity of the float body (1) is communicated with the vessel gas phase via the communicating pipe (3) and the hole (4), realizing automatic balance of the pressure inside and outside of the float. Compared with existing floats, the present invention has the advantages of small volume, light weight, low cost, non-limited resistant pressure, etc. The present invention is suitable for medium with high pressure and low-density.

Description

Pressure self-adaption float

The present invention relates to a kind of pressure self-adaption float, it can be applicable to float type level gauge that pressure medium uses, liquid-level switch as sensing part, and also can be used for the float is the valve of relying on oneself, STEAM TRAP etc. of sensing actuating member.

Existing float substantially all is a sealed mode, and the measure that the voltage endurance capability of raising float is generally taked is: increase wall thickness; Segmentation is set up and is strengthened hoop; Adopt expensive high strength, low density material such as titanium material etc.; Also can take measures from the structure shape aspect, withstand voltage best as ball float, can adopt a plurality of ball floats to be associated in together and use as a float.In actual applications, often above-mentioned several measures are taken all factors into consideration.The float that adopts above-mentioned measure to make, it is big to have a volume, and structure is complicated, shortcomings such as cost height; Take all factors into consideration the relation of float volume and weight, when pressure was higher, the float that low-density medium uses was difficult for realizing, has promptly dwindled Media density Applicable scope; And the voltage endurance capability of taking above-mentioned measure to improve float also is limited.

Chinese patent ZL92215736 discloses a kind of by the air pressure balance conduit, the ball float that hollow ball and mounting pipe are formed, and this ball float is exclusively used in from the draining hot water tank.When liquid level had than great fluctuation process or other unusual conditions (as liquid canful etc.), liquid was very easily entered in the ball float by barometric pipe, makes ball float malfunctioning.

In view of the shortcoming that exists in the prior art, the purpose of this invention is to provide a kind of practicality, reliable pressure self-adaption float, but this float external and internal pressure autobalance not only, and under any use condition, can both prevent that liquid from entering the float body inner chamber, guarantee the float reliable operation.

Technical solution of the present invention is: this pressure self-adaption float comprises float body and siphunculus; Siphunculus and float body sealed attachment, its lower end is positioned at the float body chamber, and the upper end is positioned on the float body; It is characterized in that it also comprises anti-liquid device, this anti-liquid device is a hollow cavity, is positioned on the float body, and its underpart has the hole; The siphunculus upper end is positioned at anti-liquid device chamber and is higher than perforate; The inner chamber of float body communicates with anti-liquid device inner chamber by siphunculus, is communicated by the outer gas phase of perforate and float again.

Another technical solution of the present invention is: this pressure self-adaption float, comprise float body and siphunculus, and siphunculus and float body sealed attachment, its lower end is positioned at the float body intracavity bottom, and the upper end is positioned on the float body; It is characterized in that it also comprises anti-liquid device and guide rod sleeve pipe; Anti-liquid device is a hollow cavity, is positioned on the float body, and its underpart has the hole; The guide rod sleeve pipe runs through anti-liquid device and float body up and down, its upper end and anti-liquid device roof sealed attachment, the diapire sealed attachment of lower end and float body; The guide rod sleeve pipe is with siphunculus outward, and siphunculus is coaxial with guide rod sleeve pipe, anti-liquid device and float body; Form the circular cylindrical passage between the outer wall of the inwall of siphunculus and guide rod sleeve pipe; The siphunculus upper end is positioned at anti-liquid device chamber and is higher than perforate; The float body inner chamber communicates with anti-liquid device inner chamber by the annular pass, is communicated by the outer gas phase of hole and float again.

The principle because above-mentioned pressure self-adaption float is interlinked to the outside in having adopted, withstand voltage unlimited, fundamentally solved the problem of withstand voltage of float; Both made as high pressure, ultrahigh pressure float, its wall thickness also can be thin as the float that atmospheric dielectric uses, thereby float is in light weight, and volume is little, and cost is low, can also be applicable to low-density medium.

Below in conjunction with accompanying drawing the present invention is elaborated.

Fig. 1 is first embodiment's of a pressure self-adaption float of the present invention sectional view.

Fig. 2 is another embodiment's of a pressure self-adaption float of the present invention sectional view.

In the sectional view shown in Figure 1, be provided with anti-liquid device 2 on the open column shape float body 1, both weld connection.Anti-liquid device 2 is actually a hollow cap, and its foot has hole 4, and hole 4 apertures are unsuitable too small, with discharge opeing degree of being in the anti-liquid device 2 swimmingly.The roof sealed attachment (welding) of siphunculus 3 and float body 1, the float body intracavity bottom is directed reach in its lower end, and the underpart is a slope mouth, and top of chamber and slightly downward elbows in the anti-liquid device 2 are directed reach in the upper end.

Float vertically swims in the medium 5 during application, in normal state, the perforate 4 of anti-liquid device 2 bottoms of float is exposed in the gas on medium 5 liquid levels, float body 1 inner chamber communicates with the container gas phase by siphunculus 3 and anti-liquid device bottom perforate 4, float body 1 chamber pressure is changed with the variation of container inner pressure, realize float external and internal pressure autobalance.Big or the abnormal condition when the medium level fluctuation (as the medium canful etc.) time, hole 4 is immersed in the medium, a little medium can enter anti-liquid device 2 by hole 4, and the gas in anti-liquid device of compression and the float body, makes it pressure to raise, and has stoped the continuation feed liquor.In the case, if container inner pressure raises, the fluid column that enters anti-liquid device 2 inner chambers when fluid column rises to the siphunculus upper end-hole, has reached the capacity limit that anti-liquid device 2 prevents feed liquor also with corresponding rising.If this moment, container pressure raise again, medium will enter float body 1 inner chamber.Therefore, though pressure self-adaption float is withstand voltage unlimited, float is operated in the designed anti-liquid capacity limit scope.Following surface analysis is Floater Structure parameter and each relationship between parameters of technology once.If the medium submergence hole 4 interior pressure of container constantly is P ₁, temperature is T ₁, the pressure when fluid column reaches siphunculus 3 upper end-hole (can think that medium is full of anti-liquid device 2 inner chambers) in the anti-liquid device 2 is P ₂, temperature is T ₂Float body 1 volume is V _This, anti-liquid device 2 is V at the volume of perforate more than 4 _Anti-, hole 4 is H to perpendicular distance between siphunculus 3 upper end-hole, the density of medium 5 is γ, can get according to equation of state of gas PV=ZnRT;

P ₁(V _This+ V _Anti-)=Z ₁NRT

(P ₂-H _γ) V _This=Z ₂NRT ₂Then:

Formula (1) is exactly the structural parameter V of pressure self-adaption float _This, V _Anti-, the relation between H and technology and medium parameter.

In the formula (1), Z ₁For gas phase gas in the container at P ₁, T ₁Compressibility factor under the state can be by P ₁, T ₁And the calculating of the critical parameter of gas is tabled look-up and can be got; Z ₂Be P ₂, T ₂Compressibility factor under the state in like manner also can obtain.

Under the high-pressure situations, H _γRelative P ₂Can ignore, then (1) formula can be reduced to:

In actual applications can be according to Media density, gas phase component, process parameter (pressure, temperature), the process parameter that comprises abnormal condition, by formula (1) and/each structural parameter of (2) calculating pressure self-adaption float, and reasonably design, can make pressure self-adaption float in each practical application, ensure not to float body 1 inner chamber feed liquor, to reach the purpose of pressure self-adaption float reliable operation reliably.

In a single day above-mentioned abnormal condition is eliminated, and promptly the medium liquid level drops under the hole 4, and the liquid in the anti-liquid device 2 can be discharged automatically by hole 4.

With the passing of time float body 1 inner chamber may have lime set and accumulate, thereby will be inserted into the lower end mouth fluid-tight of the siphunculus 3 of its bottom, when the float pressure outside slightly descends, because the effect of float inside and outside differential pressure makes lime set discharge along siphunculus 3 and hole 4.

Also can design another embodiment of pressure self-adaption float according to same inventive concept.Fig. 2 is its sectional view, in Fig. 2, the float body 1 of hollow ball-shape ' on be provided with the anti-liquid device 2 of open column shape, both weld connection.Anti-liquid device 2 foots have hole 4, and hole 4 is unsuitable too small, with can be swimmingly in the anti-liquid device 2 discharge opeing degree of being.Have a guide rod sleeve pipe 6 run through up and down anti-liquid device 2 and float body 1 ', its upper end and anti-liquid device 2 roof sealed attachment, lower end and float body 1 ' the diapire sealed attachment.The guide rod sleeve pipe be with outward siphunculus 3 '; Siphunculus 3 ' with guide rod sleeve pipe 6, anti-liquid device 2 and float body 1 ' be coaxial, like this siphunculus 3 ' inwall and the outer wall of guide rod sleeve pipe 6 between formation circular cylindrical passage 7, this passage 7 should be narrow as far as possible, but with the unimpeded degree of being of gas-liquid.Siphunculus 3 ' with float body 1 ' item wall sealed attachment, siphunculus 3 ' go up to support anti-liquid device 2 tops supports float body 1 ' bottom down, and float body 1 ' inner chamber is communicated with anti-liquid device 2 inner chambers by annular pass 7, is communicated by gas phase outside hole 4 and the float again.Realize float external and internal pressure autobalance.

When this pressure self-adaption float is used, insert a guide rod (not shown) in its guide rod sleeve pipe 6, guide rod is perpendicular to the liquid level of medium 5, and float is along with the lifting of liquid level, and is upper and lower mobile along guide rod.In normal working, hole 4 is exposed in the gas on medium 5 liquid levels, and float body 1 ' inner chamber communicates with the outer gas phase of float by annular pass 7 and hole 4, realizes float external and internal pressure autobalance.

The anti-liquid device 2 of present embodiment prevents the principle of float body 1 ' inner chamber feed liquor, the relation between Floater Structure parameter and medium, process parameter, and the discharge principle of floating body 1 ' interior lime set is identical with the embodiment of Fig. 1, does not repeat them here.

Certainly float body 1 or 1 ' and the shape of anti-liquid device 2 be not limited to above-mentioned two embodiments' shape, also can be designed to other shapes.Among above-mentioned two embodiments, float body 1 or 1 ' with anti-liquid device 2 all is directly to go up lower link (welding), certainly both also can upper and lowerly keep at a certain distance away, and by siphunculus 3 or 3 ' and/or other parts link indirectly, during this kind situation, anti-liquid device 2 bottom perforates 4 can be opened in its bottom.

Among above-mentioned two embodiments, siphunculus 3 or 3 ' by body 1 or 1 ' the top inject its inner chamber and reach the bottom, can certainly be designed to insert float body 1 or 1 ' inner chamber by bottom or other positions, what but no matter insert from position, siphunculus 3 or 3 ' with float body 1 or 1 ' the insertion position must sealed attachment, and the lower end of siphunculus is positioned at float body 1 or 1 ' intracavity bottom.Among above-mentioned two embodiments, siphunculus 3 or 3 ' enter its inner chamber by the bottom of preventing liquid device 2 also can enter its inner chamber by its top or other positions, this kind situation certainly, siphunculus 3 and the necessary sealed attachment of the entry site of anti-liquid device 2, and the upper end is positioned at anti-liquid device 2 top of chamber.

Claims

1. pressure self-adaption float, it comprises float body (1) and siphunculus (3); Siphunculus (3) and float body (1) sealed attachment, its lower end is positioned at float body (1) chamber, and the upper end is positioned on the float body (1); It is characterized in that it also comprises anti-liquid device (2), this anti-liquid device (2) is a hollow cavity, is positioned on the float body (1), and its underpart has hole (4); Siphunculus (3) upper end is positioned at anti-liquid device (2) chamber and is higher than perforate (4); The inner chamber of float body (1) communicates with anti-liquid device (2) inner chamber by siphunculus (3), is communicated by the outer gas phase of perforate (4) and float again.

2. pressure self-adaption float according to claim 1 is characterized in that, said float body is an open column shape, the intracavity bottom that float body (1) is directed reach in siphunculus (3) lower end, and the underpart is a slope mouth; The top of anti-liquid device (2) inner chamber is directed reach in the upper end, and slightly downward elbow.

3. pressure self-adaption float, it comprises float body (1 ') and siphunculus (3 '); Siphunculus (3 ') and float body (1 ') sealed attachment, its lower end is positioned at float body (1 ') intracavity bottom, and the upper end is positioned on the float body (1 '); It is characterized in that it also comprises anti-liquid device (2) and guide rod sleeve pipe (6); Anti-liquid device (2) is a hollow cavity, is positioned on the float body (1 '), and its underpart has hole (4); Guide rod sleeve pipe (6) runs through anti-liquid device (2) and float body (1 ') up and down, its upper end and anti-liquid device (2) roof sealed attachment, the diapire sealed attachment of lower end and float body (1 '); The guide rod sleeve pipe is with siphunculus (3 ') outward, and siphunculus (3 ') is coaxial with guide rod sleeve pipe (6), anti-liquid device (2) and float body (1 '); Form circular cylindrical passage (7) between the outer wall of the inwall of siphunculus (3 ') and guide rod sleeve pipe (6); Siphunculus (3 ') upper end is positioned at anti-liquid device (2) chamber and is higher than perforate (4); Float body (1 ') inner chamber communicates with anti-liquid device (2) inner chamber by annular pass (7), is communicated by the outer gas phase of hole (4) and float again.