CN111520494A - Cage sleeve, cage sleeve type throttle valve and throttling method - Google Patents

Abstract

The invention discloses a cage, a cage type throttle valve and a throttle method, and belongs to the technical field of cage type throttle valves. Wherein, the peripheral surface of the cage is provided with a number of orifices for communicating with the inlet of the cage-type throttle valve, and the sum of the flow areas of the orifices is the same as the opening of the cage in the axial direction. a linear relationship. In the cage type throttle valve of the invention, when the medium passes through the cage, the sum of the flow area of the medium and the opening degree of the cage in the axial direction have a linear relationship, so that the medium flow can be accurately adjusted.

Description

A cage, cage type throttle valve and throttling method

technical field

The invention belongs to the technical field of a cage type throttle valve, and relates to a cage, a cage type throttle valve and a throttling method.

Background technique

The choke valve of ultra-high pressure wells has short life, serious erosion damage, and expensive imports. The choke valve often occurs in the following failure modes during the working process: erosion damage of the valve core orifice, valve sleeve brittleness, valve The core falls off, the packing seal fails, the ring groove and the steel ring are damaged, etc., among which the main damage is the damage of the valve core, the valve sleeve and the plunger. In the process of natural gas exploitation, some gas wells have poor exploitation conditions (difficulty, large flow rate, etc.), so ordinary pressure reducing valves are not enough to adapt to the exploitation conditions. The application of cage type throttle valve can better meet the requirements.

However, the existing cage type throttle valve, such as the patent application number "201910369906.3" and the name "a cage type throttle valve", the patent application number "201820640406.X" and the name "a new type of throttle valve" In patents such as "Cage Throttle Valve", the orifice is a single row of holes arranged in the axial direction of the cage (or valve core), as shown in Figure 1. However, the arrangement of only one row of holes will make the cage The flow area of the sleeve has a step-like jumping state, as shown in Figure 2, which cannot meet the requirements of accurately adjusting the flow of the medium.

In addition, most of the existing cage type throttle valves are one-stage throttling, the adjustable pressure range of the cage type throttle valve is small, and multiple throttle valves are required to reduce the ultra-high pressure, and the cost is high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a cage, a cage type throttle valve and a throttle method that can precisely adjust the flow of the medium.

The purpose of the present invention is achieved as follows: the present invention provides a cage, the peripheral surface of the cage is provided with a plurality of throttle holes for communicating with the inlet of the cage type throttle valve, the throttle The sum of the flow area of the holes has a linear relationship with the axial opening of the cage.

Preferably, the orifice is a square hole.

Preferably, the throttling holes are arranged in two rows in a staggered arrangement along the axial direction of the cage, the axial height d0 of each throttling hole in the two throttling holes is equal, and the throttling holes in one row are adjacent to each other. The axial distance d1 between the two orifices is equal to the axial width d2 of the corresponding orifice in the other row of orifices.

Preferably, the throttling holes are arranged in three rows of dislocations along the axial direction of the cage, the axial heights e0 of the throttling holes in the three rows of the throttling holes are equal, and the throttling holes in the three rows include sequential heights e0. The first row of orifices, the second row of orifices and the third row of orifices are provided, and the axial distance e1 between two adjacent orifices in the second row of orifices is equal to the first row of throttles The axial width e2 of the corresponding orifice in the holes or the axial width e3 of the corresponding orifice in the third row of orifices.

Preferably, the orifices are arranged in three rows of staggered rows along the axial direction of the cage, and the three rows of orifices include a fourth row of orifices, a fifth row of orifices, and a sixth row of orifices , the axial spacing f1 between adjacent two orifices in the fifth row of orifices is equal to the axial width f2 of the corresponding orifices in the fourth row of orifices or the corresponding throttle in the sixth row of orifices The axial width f3 of the hole and the axial height f4 of the orifice in the fifth row are equal to the sum of the axial height f5 of the fourth row of orifices and the axial height f6 of the sixth row of orifices.

Further, the end of the cage used to communicate with the outlet of the cage type throttle valve is provided with a base that is sealed to it, and the base is provided with a number of second throttle holes for communicating with the cage type throttle valve. The outlet is connected.

Preferably, the cage and the base are integrally formed.

The present invention also provides a cage type throttle valve, comprising a valve body, wherein the above cage is provided in the valve body.

Preferably, the valve body is provided with a valve rod, the valve rod extends into the inner hole of the cage, and one end of the valve rod which protrudes into the cage is in clearance fit with the cage.

The invention also provides a throttling method, comprising the following steps: providing a cage-type throttle valve, so that the medium enters from the inlet of the cage-type throttle valve, and then passes through the throttle hole on the cage; making the medium pass through the cage When there is an orifice on the sleeve, the sum of the flow area of the medium has a linear relationship with the opening of the cage in the axial direction;

When the medium passes through the cage outlet end of the cage type throttle valve, a secondary throttling is formed;

Finally, the medium passing through the cage is allowed to flow out of the outlet of the cage throttle.

Due to the adoption of the above technical solutions, the present invention has the following beneficial effects: when the medium passes through the cage, the sum of the flow area of the medium and the axial opening of the cage are linearly related to the cage type throttle valve of the present invention. Accurate adjustment of medium flow is achieved.

Description of drawings

Fig. 1 is the structural representation of cage in the prior art;

2 is a schematic diagram of the relationship between the flow area and the axial opening of the cage in the prior art;

Fig. 3 is the three-dimensional schematic diagram of the cage in Embodiment 1 of the present invention;

4 is a cross-sectional view of the cage in Embodiment 1 of the present invention;

Fig. 5 is the unfolded schematic diagram of the cage in Embodiment 1 of the present invention;

Fig. 6 is the unfolded schematic diagram of the cage in Embodiment 2 of the present invention;

Fig. 7 is the unfolded schematic diagram of the cage in Embodiment 3 of the present invention;

8 is a schematic structural diagram of a cage type throttle valve in Embodiment 4 of the present invention;

FIG. 9 is a schematic diagram of the flow direction of the medium in FIG. 8 .

reference number

In the drawings, 100 is a cage, 101 is an orifice, 102 is a base, 103 is a second orifice, 200 is a valve body, 300 is a valve stem, O is the outlet of the cage-type throttle valve, and I is Inlet of caged throttle valve.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, in a specific manner construction and operation, and therefore should not be construed as limiting the invention. The terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Example 1

3-5, a cage 100, the peripheral surface of the cage 100 is provided with a plurality of orifices 101 for communicating with the inlet I of the cage-type throttle valve, and the flow area of the orifice 101 is The sum has a linear relationship with the axial opening y of the cage 100 . The orifice 101 is a square hole. The setting of the square hole makes the flow area and the opening degree y of the cage 100 in the axial direction form a linear equation, which satisfies a linear relationship. In this embodiment, the orifice 101 is a thin-walled orifice.

The orifices 101 are arranged in two rows of dislocations along the axial direction of the cage 100 , the axial heights d0 of each orifice 101 in the two rows of orifices 101 are equal, and the two adjacent orifices 101 in one row of orifices have the same axial height d0 . The axial distance d1 between them is equal to the axial width d2 of the corresponding orifice 101 in the other row of orifices.

One end of the cage 100 used for communicating with the outlet O of the cage type throttle valve is provided with a base 102 which is sealed to it, and a plurality of second throttle holes 103 are provided on the base 102 for connecting with the cage type throttle valve. Outlet O is connected. It is beneficial to increase the adjustable pressure range and reduce the cost.

The cage 100 and the base 102 are integrally formed. It is beneficial to improve the overall strength of the cage 100 .

Example 2

As shown in FIG. 6 , the difference between this embodiment and Embodiment 1 is that the orifices 101 are arranged in three rows of dislocations along the axial direction of the cage 100 , and the axial height e0 of each orifice 101 in the three rows of orifices Equally, the three rows of orifices include a first row of orifices, a second row of orifices, and a third row of orifices, and the second row of orifices between two adjacent orifices 101 The axial spacing e1 is equal to the axial width e2 of the corresponding orifice 101 in the first row of orifices or the axial width e3 of the corresponding orifice 101 in the third row of orifices.

Example 3

As shown in FIG. 7 , the difference between this embodiment and the previous embodiment is that the orifices 101 are arranged in three rows of dislocations along the axial direction of the cage 100 , and the three rows of orifices include a fourth row of orifices, a fifth row of orifices The orifice, the sixth row of orifices, and the axial spacing f1 between two adjacent orifices 101 in the fifth row of orifices are equal to the axial width of the corresponding orifice 101 in the fourth row of orifices f2 or the axial width f3 of the corresponding orifice 101 in the sixth row of orifices, and the axial height f4 of the orifice 101 in the fifth row of orifices is equal to the axial height f5 of the fourth row of orifices and the The sum of the axial heights f6 of the six rows of orifices.

Example 4

As shown in FIG. 8 and FIG. 9 , a cage type throttle valve includes a valve body 200 , and the above cage 100 is provided in the valve body 200 .

In this embodiment, the valve body 200 is provided with a valve stem 300 , the valve stem 300 extends into the inner hole of the cage 100 , and one end of the valve stem 300 that extends into the cage 100 is in clearance fit with the cage 100 . Through the axial movement of the valve stem 300 in the cage 100, the sum of the flow area of the orifice 101 and the axial opening of the cage 100 have a linear relationship, so that the precise adjustment of the medium flow can be realized.

The above-mentioned cage-type throttle valve can realize a throttling method, comprising the following steps: providing the above-mentioned cage-type throttle valve, so that the medium enters from the inlet I of the cage-type throttle valve, and then passes through the cage 100. When the medium passes through the orifice 101 on the cage 100, the sum of the flow area of the medium and the opening of the cage 100 in the axial direction have a linear relationship;

A secondary throttling is formed when the medium passes through the outlet end of the cage 100 of the cage type throttle valve;

Finally, the medium passing through the cage 100 is allowed to flow out of the outlet O of the cage throttle.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should Various changes may be made in details without departing from the scope of the invention as defined by the claims.

Claims (10)

1. A cage, the peripheral surface of the cage is provided with a number of orifices for communicating with the inlet of the cage-type throttle valve, it is characterized in that, the sum of the flow area of the orifice It has a linear relationship with the axial opening of the cage. 2 . The cage according to claim 1 , wherein the orifice is a square hole. 3 . 3 . The cage according to claim 2 , wherein the orifices are dislocated in two rows along the axial direction of the cage, and the axis of each orifice in the two rows of the orifices is staggered. 4 . The heights d0 are equal, and the axial distance d1 between two adjacent orifices in one row of the orifices is equal to the axial width d2 of the corresponding orifices in the other row of orifices. 4 . The cage according to claim 2 , wherein the orifices are arranged in three rows of dislocation along the axial direction of the cage, and the axial direction of each orifice in the three rows of the orifices is The heights e0 are equal, and the three rows of orifices include a first row of orifices, a second row of orifices, and a third row of orifices, and two adjacent orifices in the second row of orifices The axial distance e1 therebetween is equal to the axial width e2 of the corresponding orifices in the first row of orifices or the axial width e3 of the corresponding orifices in the third row of orifices. 5 . The cage according to claim 2 , wherein the orifices are arranged in three rows of dislocations along the axial direction of the cage, and the three rows of the orifices comprise a fourth row of orifices, The fifth row of orifices and the sixth row of orifices, the axial distance f1 between the adjacent two orifices in the fifth row of orifices is equal to the axial direction of the corresponding orifice in the fourth row of orifices The width f2 or the axial width f3 of the corresponding orifice in the sixth row of orifices, the axial height f4 of the orifice in the fifth row of orifices is equal to the axial height f5 of the fourth row of orifices and the sixth row of orifices. The sum of the axial heights f6 of the row orifices. 6. The cage according to any one of claims 1-5, wherein the end of the cage used to communicate with the outlet of the cage type throttle valve is provided with a base for sealing it, and the base is A plurality of second throttle holes are provided for communicating with the outlet of the cage type throttle valve. 7 . The cage according to claim 6 , wherein the cage and the base are integrally formed. 8 . 8. A cage type throttle valve, comprising a valve body, wherein the valve body is provided with the cage according to any one of claims 1-7. 9 . The cage type throttle valve according to claim 8 , wherein the valve body is provided with a valve rod, the valve rod extends into the inner hole of the cage, and the valve rod extends One end that goes into the cage is in clearance fit with the cage. 10. A throttling method, comprising the steps of: providing a cage type throttle valve, so that the medium enters from the inlet of the cage type throttle valve, and then passes through the throttle hole on the cage; When there is an orifice on the cage, the sum of the flow area of the medium has a linear relationship with the axial opening of the cage; When the medium passes through the cage outlet end of the cage type throttle valve, a secondary throttling is formed; Finally, the medium passing through the cage is allowed to flow out of the outlet of the cage throttle.

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