RU86236U1 - LIQUID OR GAS FLOW CONTROL DEVICE - Google Patents

Abstract

1. A device for controlling the flow of liquid or gas, consisting of a housing with a saddle for a locking element and an annular magnet in the magnetic circuit, rigidly fixed to the housing, a rod to which the locking element with a seal is rigidly fixed, a disk of soft magnetic material, a throttle that is in the way flow when open, characterized in that it contains a set of shaped springs, which at one end abut against a disk of magnetically soft material, exerting pressure on the rod, and others on the inner cylindrical body surface, or in lieu of shaped springs comprises a magnet system providing similar force on the rod. ! 2. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the shaped springs are arranged uniformly around the circumference radially. ! 3. The device for controlling the flow of liquid or gas according to claim 1, characterized in that each link of the shaped spring is made with the ability to swing relative to (around) its ends so that it simultaneously performs the function of a lever on hinges. ! 4. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the adjustment screw is made of magnetically hard steel magnetized. ! 5. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the shaped spring is made so that its inner ends of the links are interconnected. ! 6. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the shaped spring is made of an elastic rod.

Description

Application area

The utility model relates to the oil industry and can be used to measure well production. Flow meters designed to measure the liquid phase of well production typically have a very limited flow range, which ensures high measurement accuracy. To ensure such a flow range, a real (or: proposed) product is installed on the flow meter line, which allows the accumulated liquid to be measured and passed at a speed corresponding to the flow range of a specific flow meter.

State of the art

Existing products for this purpose have certain disadvantages: a large number of rubbing (wearing out) parts, which leads to a “freeze” of the regulator (that is, the regulator remains in a half-open state). Due to the rapid wear of the sealing elements and the wear of the rubbing parts, a “freeze” or leakage of the measured medium occurs.

Known magnetically controlled valve containing a seat, an anchor with a spool, placed in the separation tube made of soft magnetic material, and a permanent magnet located between two disks of soft magnetic material, fixedly mounted on the separation tube, and enclosed in a cage of soft magnetic material, made with the possibility axial displacement (SU, copyright certificate No. 406483 dated 02.25.72, F16K 31/08).

A disadvantage of the known magnetically controlled valve is the inability to control the values: spring force and magnetic flux; in order to adjust the magnetically controlled valve to a predetermined pressure drop of the working medium on the valve shut-off element, which narrows the scope of the valve in terms of pressure drop. A known valve comprising a housing, a spring-loaded locking element with a rod, a seat, a throttle, a spring equipped with a washer of magnetic material mounted on the stem and located between two ring magnets located in two magnetic circuits, rigidly attached to the housing, and alternately interacting with the washer in its extreme positions when it moves with the rod, while the throttle in the form of a throttling disk is installed in the passage section of the valve seat and is rigidly fixed to the locking body (RU, patent No. 2199662, C2 on the image ix on 29.05.2001, at E 21 B 47/10).

A disadvantage of the known valve is the difficulty of regulating the quantities: the force of the spring and the holding magnetic force of the magnetic circuit formed from an annular magnet, magnetic circuit and washer; in order to adjust the valve to a predetermined value of the differential pressure of the working medium on the valve at the moments of opening and closing of the valve, which narrows the scope of the valve in terms of pressure drop. The closest analogue is the valve magnetically adjustable (KMP), options (RU, patent No. 2307279). The magnetically adjustable valve comprises a housing, a spring-loaded locking element with a stem, a seat, a washer made of magnetic material on the stem, two ring magnets, and a one-stage throttle in the form of a throttling disk. The one-stage throttle is installed in the bore of the saddle nozzle and is rigidly fastened to the locking element. The housing consists of a base with a baffle in which the saddle is fixed, the first sleeve with a magnetic circuit rigidly fixed in it and screwed into the base, the second sleeve with the magnetic circuit rigidly fixed in it, screwed into the first sleeve on the thread, a cup with a screw device for adjusting the preliminary compressive forces of a spring loading a locking member screwed onto a thread in a second sleeve. The first and second bushings and the cup are installed with the possibility of movement along the thread to regulate axial clearances between the washer, in its extreme positions, and magnetic circuits, while the movement of the washer, rigidly fixed on the rod, from one extreme position to the other is limited in one direction by the stop of the locking element about the saddle, in another - focusing the shoulder of the rod on the partition of the base of the body.

This device is difficult to manufacture, contains many rubbing pairs, unreliable in operation.

All of the above devices are spring-loaded with a conventional coil spring, in which the force exerted on the rod increases as the valve opens (according to Hooke's law), and this fact worsens the “relay” operation of the device. In all the above-mentioned devices, a large area choke is used to ensure “relay” operation, which greatly reduces the device’s throughput in the open state, which also limits their scope.

The purpose of the utility model is to minimize the above disadvantages, increase reliability, stability in work.

Technical result: the flow rate of the fluid is optimal for the flowmeter. In addition, the device is simple to manufacture, contains a small number of parts, rubbing pairs. Provides an increase in reliability, stability in operation.

Brief Description of the Drawings

Figure 1 shows the state of the device for regulating the flow of liquid or gas in the closed state, where 1 is the housing, 2 is the seat, 3 is the throttle, 4 is the shut-off element with a seal, 5 is the rod, 6 is the magnet in the magnetic circuit, 7 is the disk of soft magnetic material, 8 - adjusting screw, 9 - shaped springs.

Figure 2 shows the state of the device for regulating the flow of liquid or gas in the open state.

Figure 3 shows a variant of replacing shaped springs with a system of magnets operating in the repulsion mode.

Utility Model Implementation

The claimed technical result is achieved due to the fact that (see Figure 1, Figure 2) a device for controlling the flow of liquid or gas, consisting of a housing (1) with a seat (2) for the locking element and the ring magnet in the magnetic circuit (6), rigidly fixed to the housing (1); rod (5), to which a locking element with a seal (4) is rigidly fixed, a disk of soft magnetic material (7), a throttle (3), which is in the flow path when open, characterized in that it contains a set of shaped springs (9) which at one end abut against a disk of soft magnetic material (7), exerting pressure on the rod (5), and at the other against the inner cylindrical surface of the housing (1), or instead of shaped springs, contain a system of magnets providing a similar force effect on the rod. Shaped springs can be arranged uniformly around the circumference radially.

Each link of the shaped spring (9) is made with the ability to swing relative to (around) its ends so that it simultaneously performs the function of a lever on hinges. Hard magnetic steel adjusting screw can be magnetized. This will provide a more secure hold in the open state. The shaped spring (9) can be made so that its inner ends of the links are interconnected (made of solid metal).

Also, the shaped spring can be made of an elastic rod (i.e., circular cross section). Thanks to the throttle (3), a powerful flow keeps the valve open. The rod (5) connects the moving parts. A magnet (6) keeps the valve closed to a certain pressure. The adjusting screw (8) limits the stroke of the rod (5) from above so as not to jump to the unstable position of the springs. Shaped springs (9) are levers that in the operating range work like a spring with a “negative” characteristic - the more you move the rod from bottom to top, the less the resistance of the springs becomes. In addition, the springs provide centering of the upper end of the rod, thereby eliminating another rubbing pair, resulting in movement without friction. Any friction contributes to "freezing", that is, the device remains in a half-open state.

All this as a whole also provides a small number of parts rubbing pairs. Thanks to the use of the shaped spring, there is no need to fix the open state of the liquid or gas flow control device with a second magnet, there is no need to center the upper end of the rod, the number of rubbing parts decreases (the service life is increased), “freezing” in the half-open state is eliminated, and the material consumption is reduced.

Thus, in general, an increase in reliability, stability in operation is provided. The rod with parts fixed to it has the ability to move in the axial direction: the downward movement is limited by a locking element and a disk of magnetic material, which abuts against a magnet that is stationary relative to the body. The upward movement is limited by the adjusting screw.

A distinctive feature of the device for regulating the flow of liquid or gas is a set of shaped springs arranged uniformly around the circumference radially, which at one end abut against the stem, and with the other on the inner cylindrical surface of the housing. Each link of the shaped spring has the ability to swing relative to (around) its ends, thereby simultaneously fulfilling the function of a lever on hinges. The same set of springs holds the upper end of the rod in the geometric axis of the cylindrical part of the body (that is, in the center), thereby eliminating the need to center the rod in the body, which means there is no rubbing pair.

Thus, the shaped springs "swing" relative to their ends and at the same time work as a lever. Due to this, the vertical component of the elastic force decreases as the rod moves upward, fulfilling the function of a spring with a “negative” characteristic.

In the state of the device for controlling the flow of liquid or gas, when the valve is closed (see Figure 1), the elastic force of each element of the shaped spring is directed from one support point (from one end) to the other (to the other end). If the elastic force is decomposed into vertical and horizontal components, then the vertical components “push” the rod with the hinged parts down, and the horizontal ones hold the rod in the center of the body.

Consider another state of the device for regulating the flow of liquid or gas when the valve is open (see Figure 2). As can be seen from the drawing, when moving the rod upward, the elements of the shaped spring compressed slightly, while the elastic force increased, but the vertical component decreased. This is the basic principle of the device, distinguishing it from prototypes. Due to this property of this shaped spring, the "relay" of the device for controlling the flow of liquid or gas is improved.

A suitable (optimal) flowmeter for the flowmeter is achieved by cyclically opening and locking the flow of the measured fluid.

The device should work relayly, that is, it must have two stable states: “open” and “closed”. It is a spring with a "negative" characteristic that provides good relaying.

The basics of the relay operation of the device are as follows.

The task of the device for regulating the flow of liquid or gas is to jump open at a given pressure, jump to close at a given reduced pressure.

Consider the forces that act on the moving parts of a device for regulating the flow of liquid or gas (ie, on the stem with the parts attached to it), and how they change during the movement of the rod “up” and “down”.

The force of attraction to the magnet in the lower position of the rod is maximum, after the separation of the magnetic disk from the magnet sharply decreases to almost zero. This power is negative.

Friction forces are always directed against the direction of motion, they are quite small.

When the rod moves up, the friction forces are negative, and when it moves down, it is positive.

The pressure force of the pressure on the locking element (valve) with the valve closed increases as the pressure drop increases. When the value of this force begins to exceed the sum of the opposing forces (magnet force, vertical components of the elastic forces, friction forces), the rod starts to move up. When the valve opens, the pressure decreases sharply. In this case, the movement of the controlled medium begins and the force of the dynamic pressure of the flow on the throttle appears. Further, as the valve opens, this force decreases markedly. With further opening, the flow increases, this force is replaced by the force of the dynamic pressure of the flow on the throttle.

The opening process occurs very quickly, then the accumulated liquid is drained, while the pressure gradually decreases, the force of dynamic pressure decreases. When this force becomes less than the sum of the downward forces (insignificant magnet force, spring force, friction force), the rod starts to move down.

The stem has dropped, the valve is closed — fluid accumulation begins, pressure increases — the cycle repeats.

In the process of moving the rod down, the modulus of the resultant forces decreases markedly. Under unfavorable circumstances (for example, if the friction force is large), the valve may “hang” at this point, that is, it may remain in the “half-closed” position.

The principle of operation of the device

The device begins its work with a closed state - the fluid flow is blocked (see Figure 1). As the liquid accumulates (the liquid accumulation tank is located up to the device for regulating the liquid or gas flow), the pressure starts to increase, which presses the shut-off element (4) of the liquid or gas flow control device, but it remains closed, since the pressure forces the vertical components of the elastic forces and the holding force of the magnet (6). As pressure increases, the pressure force begins to exceed the sum of these forces, and the rod (5), tearing the disk (7) from the magnetically soft material away from the magnet, rushes up. As you move, the vertical component of the forces decreases, but the locking element (4) opens a bit too - the liquid rushes to the outlet. In this case, the pressure force of the flow on the shut-off element decreases. But the fast fluid flow creates a force of dynamic pressure on the throttle (3). Due to this force, the device for controlling the flow of liquid or gas remains in the open state. As the fluid leaves, the flow rate decreases, which means that the force of the dynamic pressure of the flow decreases. Under the action of the vertical component of the elastic forces, the rod (5) begins to move downward, while the vertical pressure force increases sharply, the device for controlling the flow of liquid or gas closes confidently, the disk (7) from magnetically soft material adheres to the magnet (6) - fluid collection begins for the next work cycle.

As an embodiment, shaped springs can be replaced by a system of magnets operating in the repulsion mode and having a similar force effect. Such a result can be obtained, for example, by a pair of radially magnetized bushings with different magnetic polarity (see the example in figure 3). The outer magnetic sleeve is rigidly attached to the body, and the inner one to the stem. Figure 3 on the left shows the state of the stem with the valve closed when the repulsive effect of the magnets is close to maximum. Figure 3 on the right - the upper position of the rod (valve "open"), the repulsive force of the magnets is close to zero. With further movement of the rod upward, a state of unstable equilibrium of the magnetic system occurs, using the adjusting screw, the necessary value of the repulsive force in the open state of the valve is set. The same magnets provide alignment of the rod relative to the cylindrical body.

It is possible to use other magnetic systems with a similar force effect.

Claims (6)

1. A device for controlling the flow of liquid or gas, consisting of a housing with a saddle for a locking element and an annular magnet in the magnetic circuit, rigidly fixed to the housing, a rod to which the locking element with a seal is rigidly fixed, a disk of soft magnetic material, a throttle that is in the way flow when open, characterized in that it contains a set of shaped springs, which at one end abut against a disk of magnetically soft material, exerting pressure on the rod, and others on the inner cylindrical body surface, or in lieu of shaped springs comprises a magnet system providing similar force on the rod. 2. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the shaped springs are arranged uniformly around the circumference radially. 3. The device for controlling the flow of liquid or gas according to claim 1, characterized in that each link of the shaped spring is made with the ability to swing relative to (around) its ends so that it simultaneously performs the function of a lever on hinges. 4. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the adjustment screw is made of magnetically hard steel magnetized. 5. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the shaped spring is made so that its inner ends of the links are interconnected. 6. The device for controlling the flow of liquid or gas according to claim 1, characterized in that the shaped spring is made of an elastic rod.