JPH01234601A - Pressure tank - Google Patents

Abstract

PURPOSE: To prevent damage of a separator in a pressure tank by arranging a valve whose upper surface of a head is a domed shape having a circular profile in a plan view, and specifying the relation between the diameter of the circular profile and a radius of sphere containing the dome. CONSTITUTION: An upper surface 31 of a head 22 of a valve 21 has a domed shape contained in a sphere having a radius R, and having a circular prifile of a diameter D in a plan view. The relation between the diameter D and a radius R is indicated by the following relation: 0.8<R/D<1.5. The upper surface 31 of the head 22 of the valve 21 is thus reinforced. A more rigid separator 11 can be used for preventing biting and breakage of the separator 11. Closing of the valve 21 can be retarded, so that an amount of liquid which a pressure tank can discharge before closing is increased, and efficiency of the pressure tank can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION AND PRIOR ART The present invention generally relates to pressure tanks of the type used, for example, as pressure transmissors or accumulators.

In particular, the present invention provides a rigid body having an elastically deformable separator dividing an internal volume into two different chambers (i.e. a gas chamber and a liquid chamber) and communicating the exterior of the rigid body with the liquid chamber. an opening in the rigid body for connecting the valve seat (and in fact for connecting the circuit), the opening having a head extending perpendicularly to the valve seat surrounding the opening, and having a head extending perpendicularly to the valve seat surrounding the opening, and having a head extending perpendicularly to the valve seat surrounding the opening; It relates to a pressure tank controlled by a valve with the valve being acted on by biasing elastic means.

In use, a valve is normally open with its head held spaced apart from the valve seat by associated resilient means (i.e., usually just a coil spring type spring) and The chamber is filled with liquid at a pressure equal to the pressure in the communicating circuit and commensurate with the pressure in the gas chamber.

However, if negative pressure occurs in the communication circuit,
Liquid is drawn from the liquid chamber, thereby tending to empty the liquid within the liquid chamber.

Due to the pressure in the gas chamber, the elastically deformable separator undergoes expansion, which forces it against the head of the valve controlling the opening of the corresponding liquid.

Because of this push, the upper surface of the head, which has a circular profile in plan, is usually more or less convex.

In practice, this upper surface is usually in the form of a spherical dome.

However, so far this upper surface is relatively flat, and the corresponding spherical dome has a radius that is much larger than the total diameter of its profile.

In any case, due to the synergistic effect of the contact pressure exerted by the elastically deformable separator when it is pressed against the upper side of the valve head, and the suction force exerted from below by the exiting liquid, the valve controlling the liquid orifice. The valve has a tendency to close despite the action of elastic means biasing the valve against the valve seat, and the elastically deformable separator in the communicating circuit has a tendency to close, which is clearly detrimental to the good strength of the assembly. This is necessary to avoid extrusion.

However, in at least some types of applications, the liquid to be discharged (i.e., the liquid commonly referred to as water discharge)
It is desirable for the valve to be open as fully and as long as possible in order to maximize the flow rate before closing, thus optimizing the efficiency of the pressure tank.

In order to delay the closure of a valve, it is common to increase the stiffness of the resilient means that keep it open.

However, in the absence of other conditions, this results in rapid damage to the elastically deformable separator, as experience has confirmed.

Indeed, in view of the strength provided by the elastic means, which in this case is increased in stiffness, this elastically deformable separator, when pressed against the upper side of the valve head, rapidly joins with the entire valve and, on the one hand, delimits it. On the other hand, even after bypassing this ridge, there is a risk of being caught between the head and the valve seat, and in either case, the life of the valve may be shortened. It will be damaged.

SUMMARY OF THE INVENTION The present invention is based on the discovery that simply preferential selection of geometry dimensions can increase assembly performance while avoiding such risks.

The object of the invention is a pressure tank that makes use of such a choice of geometric dimensions.

This pressure tank has two chambers with different internal volumes (
That is, it includes a rigid body having an elastically deformable separator dividing the rigid body into a gas chamber and a liquid chamber, and an opening in the rigid body for communicating the outside of the rigid body with the liquid chamber. The opening is controlled by a valve having a head extending perpendicularly to the valve seat surrounding it and acting on resilient means biasing the head in a direction opposite to the valve seat. The upper side of the valve head is shaped, at least in its central zone, by an approximately spherical dome of radius R with a diametrical circular contour in plan view, said radius R and The diameter is
It is characterized by a relationship of 0.8 <--< 1.5.

For example, the upper surface of the head is formed by such a generally spherical dome of radius R as a whole.

As a variant, the upper side is formed by an approximately spherical dome of radius R with a circular contour of diameter in plan in its central zone; A peripheral zone of external shape Ds is provided which extends in the axial direction over a height H of and Ds/3.

As experience has shown and calculations have confirmed, as a result of the convexity of the upper side of the head being emphasized more than is normally permissible, the pressure with which the elastically deformable separator is pressed against said upper side at any moment is Other things being equal, it is desirable to have a more even and correspondingly larger resultant force than would be seen with a flatter top surface.

Since this resultant force is thus larger,
The stiffness of the elastic means acting on this valve is preferably higher than itself, and as a result, while adopting the above-mentioned value for the radius R according to the invention, there is no risk of any pinching against the elastically deformable separator. It must not be brought about.

Thus, with other relevant parameters constant, by doubling the stiffness of the elastic means used, for example, compared to the case of hitherto known embodiments,
It is possible to increase the water discharge limit by 40%.

Naturally, the increased stiffness of the elastic means thus keeping the valve open delays the closing of the valve;
The amount of liquid that can be discharged from the pressure tank before closing is increased, and the efficiency of the pressure tank is thereby improved when the pressure tank is arranged horizontally.

The features and advantages of the invention will be better understood from the description given below by way of example with reference to the accompanying drawings, in which: FIG.

Embodiment As shown in the drawings, a pressure tank according to the invention is constructed by a known method into two chambers with different internal volumes, namely a gas chamber 12 and a liquid chamber 13.
) comprises a rigid body 10 having an elastically deformable separator 11 dividing the body into two parts.

In the illustrated embodiment, the rigid body 10 is elongated with a generally cylindrical central portion and a generally hemispherical central portion.
The main body is made in one piece, for example by molding.

One opening 14A is provided in the center of the upper end in the axial direction, and an opening 14B is provided in the center of the lower end in the axial direction in alignment with the opening.

The elastically deformable separator 11, which is usually made of a synthetic material (e.g. an elastomeric material) selected to provide a certain elasticity and sufficient airtightness, is in the form of a bag.

A support 16 is mounted on the inside of the rigid body 10 from a circular outlet made around the upper opening 14A of the rigid body 10, which support is for this purpose attached to the inner surface of the rigid body 10. This exit 15 is attached.

For example, as shown, the support 16 has an axial adapter 17 through which the support traverses the opening 14A of the rigid body 10;
The support also extends beyond the body 10 through which it interacts with means for fixing it in a suitably gas-tight manner to the body 10.

The gas chamber 12 includes an elastically deformable separator 11
The adapter 17 of the support 16 is axially provided with a hole 18 suitably controlled by a valve (not shown) for its loading. There is.

These structures, which are known per se and do not form part of the invention, will not be described in detail here.

Since the liquid chamber is constituted by a part of the internal volume of the rigid body 10 outside the bag formed by the elastically deformable separator 11, the outside of the rigid body 10 and the liquid chamber 13 are communicated with each other. opening 1 for
4B is controlled in a known manner by a valve 20 having a head 22 extending perpendicular to the valve seat surrounding the opening 14B and biasing the head in a direction opposite to the valve seat 23. A valve 21 is provided, which is acted upon by elastic means 24 which act on the valve.

For example, the valve seat 23 may be connected to an adapter 25 extending on either side of the opening 14B of the rigid body 10 and suitably secured to the rigid body 10.
The adapter has a hole 26 in which the tail 27 of the valve 21 is slidably engaged for guiding the valve 21 in the axial direction, and has a hole 26 for communication between the outside and the liquid chamber 13. It further has a hole 28 parallel to the hole or holes 26 .

In reality, the adapter 25 is inserted into the communication circulation path.
By means of an adapter 25, whether it belongs to a cross-section coupling or whether the adapter itself can be attached to this coupling, a pressure tank constructed as described above can be attached to the communication circuit.

At the same time, in the illustrated embodiment, the elastic means 24 provided on the valve 21 are secured against the shoulder 30 of the adapter 25.
It is supported by the valve 21 and is in contact with the lower surface of the head 22 of the valve 21, and is composed of a coil spring type spring centered on the tail portion 27 of the valve 21.

Similarly, in a known manner, the upper side 31 of the head 22 is shaped, at least in its central zone, by an approximately spherical dome with a circular contour in plan view.

In the embodiment shown more specifically in FIGS. 1 and 2, the upper surface 31 of the head 22 is generally shaped as a generally spherical dome as described above.

Let R be the radius of this approximately spherical dome, D be the diameter of its circular contour, and Ds be the total diameter of the circular contour of the entire upper surface 31 in question.

If a spherical dome of radius R extends over the entire upper side 31, as is the case in this case, these circular contours will be identical.

In practice, the corresponding circular contour is embodied in the form of more or less gentle edges 32.

According to the invention, the radius R and the diameter have the following relationship: O,8<-<1.5 Similarly as before, the radius R may be approximately equal to the diameter.

This is the case in the illustrated embodiment, where the radius R is slightly smaller than the diameter.

To appreciate the originality of choosing such geometric dimensions, reference is now made to FIG. 3, which shows the prior art.

As can be seen in FIG. 3, the upper surface 31 of the valve head
The radius of the spherical dome forming the spherical dome usually greatly exceeds the diameter of its profile, so that this upper surface 31 is fairly flat.

As indicated by the arrow P in FIGS. 2 and 3, the convex shape of the upper surface 31 according to the present invention is stronger, so that when the elastically deformable separator 11 is pressed against it, the contact pressure P is more uniform and larger at least in the central zone of this upper side 31.

At this time, the resultant force itself is larger.

As a result, other conditions being equal, the stiffness of the elastic means 24 used can be increased, for example by a factor of two.

Also, as shown in FIG. 2, the elastically deformable separator 11 actually allows the upper side 31 of the head 22 to reach the ridge 32 before the valve 21 is closed; If this upper surface 31 were more flat, as shown in FIG. There is sex.

Since the rigidity of the elastic means 24 increases, the abscissa in FIG.
Curve I is for a pressure tank according to the invention and curve ■ is for a comparable pressure tank of known type. is larger, and the residual volume V is smaller.

Note that since the elastically deformable separator 11 does not reach the ridge 32 of the head 22, it is installed in a preferable state.

In order to more reliably maintain this state, that is, to more reliably prevent the elastically deformable separator 11 from being damaged, the rigidity of the elastic means 24 acting on the valve 21 is set as follows.
The contact pressure P pressing the elastically deformable separator 11 against the head 22 of the valve 21 is preferably selected to be between 0.02 and 0.04 MPa for a normal elastically deformable separator.

In the variant shown in FIG. 5, the upper side 31 of the head 22 of the valve 21 is shaped in its central zone 33 by an approximately spherical dome of radius R, which has a circular contour in plan view with a diameter smaller than Ds. Around the central zone 33 there is provided an annular peripheral zone 34 extending axially over a height H of O to Ds/3.

If this axial height H is zero, the above-mentioned embodiment will be used.

In any case, as before, the diameter and radius R in the plane of the circular contour of the spherical dome forming the central zone 33 of the head 22 are in the following relationship: O,8<-<1
．． 5 Similarly as before, the radius R may for example be approximately equal to the diameter.

However, since the convex shape of the upper surface of the head 22 is stronger overall, for example, the relationship with D does not satisfy the prescribed relational expression, and by adopting the radius R, an elastic means with higher rigidity is used. (In other words, the limit water discharge amount P can be further increased). However, in this case, the fatigue of the separator 11 increases to some extent, but this does not affect at least certain fields of use.
So it's not a disadvantage.

Preferably, in this case the peripheral zone 34 of the upper side 31 of the head 22 is conical, and this peripheral zone 34 and the central zone 33 of its extension are tangentially connected to each other.

C is the half angle at the apex of the cone to which the peripheral zone 34 belongs.

The following relational expressions that can be determined based on their mutual relationships hold between the various required parameters. : tgC In any case, since the peripheral zone 34 acts almost like a shield, there is no possibility that the elastically deformable separator 11 will reach the ridge 32 of the head, or it will do so with a contact pressure P of almost zero. There is only one.

Therefore, there is almost no risk of being caught when the valve 21 is closed.

Naturally, the invention is not limited to the embodiments shown and described, but encompasses all embodiments.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view of a pressure tank according to the invention having an elastically deformable separator of normal configuration. FIG. 2 is an enlarged view at H in FIG. 1 of the form of the separator that is elastically deformable when pressed against the upper surface of the head. FIG. 3 is a diagram similar to FIG. 2 relating to the prior art. FIG. 4 is a graph showing the results obtained with a pressure tank according to the invention. FIG. 5 is a partial front view of a modification of the head of a valve provided in a pressure tank according to the invention. 10... Rigid main body, 12... Gas chamber, 13
...Liquid chamber, 14A, B...Opening, 20
...Valve, 21...Valve, 22...Head, 23
...Valve seat, 24...Elastic means, 31...Upper side,
33... Central zone, 34... Peripheral zone.

Claims (7)

[Claims] (1) A rigid body 10 having an elastically deformable separator that divides the internal volume into a gas chamber 12 and a liquid chamber 13, and a rigid body 10 for communicating the outside of the rigid body 10 with the liquid chamber. The opening 14B has a head 22 extending perpendicularly to the valve seat 23 surrounding the opening 14B, and the opening 14B receives the action of an elastic means 24 biasing the head in a direction opposite to the valve seat 23. receiving valve 2
1, the upper side 31 of the head 22 of the valve 21 has an approximately spherical dome of radius R with a circular contour of diameter D in plan, at least in its central zone. It is shaped by
A pressure tank characterized in that the radius R and the diameter D have a relationship of 0.8<R/D<1.5. (2) The pressure tank according to claim (1), wherein the radius R and the diameter D are approximately equal. (3) The pressure tank according to claim 1 or 2, wherein the upper surface 31 of the head 22 of the valve 21 is formed as a generally spherical dome with a radius R as a whole. (4) The upper side 31 of the head 22 of the valve 21 has a radius R in its central zone 33 which has a circular contour with a diameter D in plan view.
The upper surface 3 is shaped like a substantially spherical dome.
Claim 1, characterized in that the central zone 33 is provided with an annular peripheral zone 34 having an outer diameter Ds and extending axially over a height of 0 to Ds/3.
Or the pressure tank described in (2). 5. Pressure tank according to claim 4, characterized in that the peripheral zone 34 of the upper side 31 of the head 22 of the valve 21 is conical. (6) Pressure tank according to claim 4 or 5, characterized in that the peripheral zone 34 and the central zone 33 of the upper side 31 of the head 22 of the valve 21 are tangentially connected to each other. (7) The rigidity of the elastic means 24 acting on the valve 21 is selected so that the contact pressure P for pressing the elastically deformable separator 11 against the head 22 of the valve 21 is 0.02 to 0.04 MPa. Claim (1) characterized by
The pressure tank according to any one of (6) to (6).