RU2793498C1 - Disc valve - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates valve devices, especially to pumps for pumping highly viscous liquids containing mechanical impurities and gas, namely, to drilling, oilfield and borehole rod pumps, and can be used in the oil and gas industry. The disc valve comprises a seat and a poppet installed in the body with an upper guide rod, interacting along the support-sealing surfaces of the seat and plate. The valve in the upper part is provided with a disc with through central and peripheral holes. The plate is spring-loaded relative to the disc to the seat. The support-sealing surface of the plate is made spherical, the radius of which is equal to the distance from the middle of the axis of the central hole to the thrust-sealing surface of the seat.

EFFECT: increased life and tightness of the valve.

3 cl, 8 dwg

Description

The invention relates to the field of mechanical engineering, in particular to valve devices, especially for pumps for pumping highly viscous liquids containing mechanical impurities and gas, including drilling, oilfield and borehole rod pumps, and can be used in the oil and gas industry.

Known poppet valve mud pump, containing installed in the pump housing seat with a conical sealing surface, a plate with a sealing ring, spring-loaded relative to the housing to the seat, the seat in the lower part is equipped with a bracket with a central through hole, and the plate is made in response to the hole guide rod (see Fig. patent of the Russian Federation No. 2223435, IPC F16K 15/02, published on February 10, 2004, Bull. No. 4).

The disadvantages of the valve are insufficient throughput due to the narrowing of the passage of the guide plate seat, as well as insufficient valve life due to intense wear of the conical sealing surface of the seat and plate when pumping abrasive-containing liquids and with a slight misalignment of the plate and seat.

Known valve assembly sucker rod pump (Catalogue "borehole rod pumps for oil production" TsINTIKHimneftemash, M. 1988, p. 22), containing a saddle, a shut-off body made in the form of a ball, a lift limiter of the shut-off body.

The disadvantages of the known valve are a significant delay in closing the valve, especially when lifting viscous oil, due to the limited weight of the ball.

A poppet valve of a borehole rod pump is known, containing a seat and a poppet installed in the housing, installed with the possibility of interaction along a conical support-sealing surface, through the central and peripheral holes are made in the upper part of the housing, and the poppet is equipped with an upper guide rod that responds to the central hole, with In this case, the plate is spring-loaded to the seat relative to the body (see T.M. Dolov. Study of the operation of valve assemblies of downhole sucker-rod pumping units. Thesis for the degree of Ph.D. M.: I.M. Gubkin Russian State University of Oil and Gas, 2017, l. 19-20, Fig. 1.6).

Equipping the poppet with a spring provides a reduction in valve closure.

The disadvantages of the known device are insufficient valve life due to intensive wear of the conical sealing surface of the seat and plate when pumping abrasive-containing liquids, as well as violation of the tightness of the valve when the plate and seat are misaligned, for example, when lifting oil from inclined wells. Regardless of the depth of the through center guide hole, the top guide rod of the cymbal is installed with guaranteed clearance. When the pump and valve are tilted relative to the vertical, the alignment of the plate and seat is disturbed.

A poppet valve is known, containing a seat and a poppet installed in the housing with a conical support-sealing surface, the housing and poppet are provided with a reciprocal central through hole and rod, while the poppet is spring-loaded to the seat relative to the housing (see book: Valitov M.Z. Calculation and design of drilling and oilfield pumps, Monograph, Volgograd, VolgGTU, 2003, p. 111, Fig. 3.12), which is taken as a prototype.

The absence of a guide plate in the seat passage increases the capacity of the valve.

The disadvantages of the known device are insufficient valve life due to intense wear of the conical sealing surface of the seat and plate when pumping abrasive-containing liquids, as well as violation of the tightness of the valve in case of misalignment of the plate and seat. If the valve deviates from the vertical, the alignment of the plate and seat may be violated.

The purpose of the proposed technical solution is to increase the life and tightness of the valve.

This goal is achieved by the fact that in a poppet valve containing a seat and a poppet with an upper guide rod installed in the body, interacting along the support and sealing surfaces of the seat and poppet, the valve in the upper part is equipped with a disk with through central and peripheral holes, and the poppet is spring-loaded relative to the disk to the seat, according to the technical solution, the support-sealing surface of the plate is made spherical, the radius of which is equal to the distance from the middle of the axis of the central hole to the support-seal surface of the seat.

The valve is equipped with a guide assembly, including a disk, rigidly connected to the seat by means of at least three rods.

The rods in the lower part are rigidly connected to the split spring ring, and in the upper part of the seat, an annular groove is made in response to the spring ring.

The design of the proposed device is illustrated by the drawing.

Figure 1 shows a General view of the poppet valve piston pump;

Figure 2 is a top view of figure 1;

Figure 3 - section A-A in figure 1;

Figure 4 - section B-B in figure 1;

Figure 5 - poppet valve downhole rod pump;

Figure 6 - section B-B in figure 5;

In Fig.7 - section GG in Fig.5;

Figure 8 - embodiment of the poppet valve with a spherical sealing surface of the seat.

The poppet valve of the piston pump (Fig. 1-4) contains a valve 2 assembly installed in the pump housing 1 (not shown in the Fig.), including a seat 3, a plate 4, for example, with a spherical support and sealing surface 5 and an upper guide rod 6 The saddle 3 is equipped, for example, with a removable guide assembly 7, which includes an upper disk 8 with through central 9 and peripheral 10 holes. The central hole 9 is made in response to the rod 6. The assembly 7 in the lower part is provided with a split spring ring 11, which is in response to the annular groove 12 in the upper part of the seat 3. The upper disk 8 and the lower spring ring 11 are interconnected, for example, by at least three rods 13 located at the same angular distance from each other.

The plate 4 is spring-loaded by the spring 14 relative to the disk 8. The lower part 15 of the upper disk 8 in the central part can be cylindrical, corresponding to the inner diameter of the spring 14.

The center of the spherical support-sealing surface 5 with radius "R" is the middle of the central through hole 9 with length "L", which acts as a guide plate 4.

The poppet valve of a rod pump (Fig. 5-7) contains a seat 3 installed in the valve body 16, a plate 4, for example, with a spherical bearing and sealing surface 5 and an upper guide rod 6. The saddle 3 is fixed by a sub 17.

In the upper part of the body 16 of the valve is provided with a disc 18, which is made through the central 9 and peripheral 10 holes. The central hole 9 is made in response to the guide rod 6. The plate 4 is spring-loaded to the seat 3 by the spring 14.

The center of the spherical support-sealing surface 5 of the plate with a radius "R" coincides with the middle of the central hole 9 with a length "L", which is the guide of the plate 4.

The support-sealing surface 19 (Fig.8) of the valve seat 3 can be made spherical, while the center of the spherical surface 19 is in the middle of the central hole 9.

The plate 4 can be equipped with a sealing ring 20, which can interact with the thrust sealing surface 19.

Poppet valve, for example, piston pump works as follows.

With increasing pressure under the plate 4 (Fig.1-4), the latter rises, overcoming the force of the spring 14 and the weight of the plate 4. The liquid from under the plate 4 flows to the upper part of the plate 4.

When the fluid flow through the valve decreases, the pressure drop across the slot (not shown in Fig.) also decreases. Under the action of the force of the spring 14 and the weight of the plate 4, the latter falls onto the seat 3. If the plate 4 deviates from the axis of the through central hole 9, the plate 4 sits accurately and with high tightness on the seat 3, because the center of rotation of the plate 4 coincides with the center of the support-sealing spherical surface 5 of the plate 4.

When the pump is pumping a liquid containing mechanical impurities and abrasives, when the plate 4 is seated on the seat 3, they do not fall on the contact surface, which is a narrow strip.

The operation of the poppet valve (FIGS. 5-7) of the rod pump is similar to that of the previous valve.

When the pressure under the valve increases, the plate 4 rises, overcoming the weight of the plate 4 and the force of the spring 14. The liquid from under the valve through the gap formed (not shown in Fig.) between the seat 3 and the plate 4 rises. With a decrease in fluid flow through the valve, the pressure drop across the slot also decreases. In this case, the plate 4 begins to fall onto the saddle 3. When the pump is installed in inclined wells (not shown in the figure), the plate tilts from the axis of the central hole 9 by an amount depending on the size of the radial gap between the hole 9 and the guide rod 6. Since the center of rotation plate 4 coincides with the center of the spherical sealing surface 5 of the plate 4, the plate 4 is accurately lowered onto the seat 3 with high tightness.

When lifting an abrasive-containing formation medium by a rod pump, the ingress of abrasive particles on the contact surface of the disc with the seat is excluded.

The operation of the valve in Fig.8 is similar to the valve in Fig.1-4. Equipping the plate 4 with a sealing ring 20 reduces the complexity of manufacturing and maintenance costs.

Thus, the implementation of the valve guide above the plate, the bearing and sealing surface 5 of the plate 4 is spherical with a center in the middle part of the central hole, allow the exact fit of the bearing and sealing surface on the seat when the axis of the plate deviates from the axis of the central hole, the ingress of abrasive impurities between the sealing surfaces is excluded plates and seats.

Claims (3)

1. A poppet valve containing a seat and a poppet with an upper guide rod installed in the body, interacting along the supporting and sealing surfaces of the seat and poppet, the valve in the upper part is equipped with a disk with through central and peripheral holes, and the poppet is spring-loaded relative to the disk to the seat, characterized in that that the supporting-sealing surface of the plate or seat is made spherical, the radius of which is equal to the distance from the middle of the axis of the central hole to the thrust-sealing surface of the seat. 2. The valve according to claim. 1, characterized in that it is provided with a guide assembly, including a disk rigidly connected to the seat by means of at least three rods. 3. The valve according to claim. 2, characterized in that the rods in the lower part are rigidly connected to a split spring ring, and in the upper part of the seat, an annular groove is made in response to the spring ring.

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