阅读说明：本技术 一种用于调节小流量的调节阀 (Regulating valve for regulating small flow ) 是由 王国俊 庞雁 于 2021-09-15 设计创作，主要内容包括：本发明涉及调节阀技术领域,具体涉及一种用于调节小流量的调节阀,包括阀座和阀芯,所述阀座与所述阀芯连接,所述阀芯上连接有阀杆,所述阀芯上设有球冠,所述球冠的表面设有调节槽,所述调节槽的起点不超过所述球冠的中心；所述调节槽的深度从球冠中心向外逐步增大。本发明通过在球冠上设置调节槽,调节槽的宽度是不变的,调节槽的深度是从球冠的中心向外逐步增大,随着球冠的旋转,介质流入调节槽,这样就能通过调节槽的深度变化进行控制调节阀的流量,由于本发明是对调节槽的深度进行调节,对于小口径管道也只需要转动比较小的角度即可实现较高精度的流量调节。(The invention relates to the technical field of regulating valves, in particular to a regulating valve for regulating small flow, which comprises a valve seat and a valve core, wherein the valve seat is connected with the valve core, a valve rod is connected onto the valve core, a spherical crown is arranged on the valve core, a regulating groove is arranged on the surface of the spherical crown, and the starting point of the regulating groove does not exceed the center of the spherical crown; the depth of the adjusting groove gradually increases from the center of the spherical cap to the outside. According to the invention, the adjusting groove is arranged on the spherical crown, the width of the adjusting groove is unchanged, the depth of the adjusting groove is gradually increased from the center of the spherical crown to the outside, and a medium flows into the adjusting groove along with the rotation of the spherical crown, so that the flow of the adjusting valve can be controlled through the depth change of the adjusting groove.)

1. A regulating valve for regulating small flow comprises a valve seat (1) and a valve core (2), wherein the valve seat (1) is connected with the valve core (2), and the valve core (2) is connected with a valve rod (3), and is characterized in that a spherical crown (4) is arranged on the valve core (2), a regulating groove (5) is arranged on the surface of the spherical crown (4), and the starting point of the regulating groove (5) is not more than the center of the spherical crown (4); the depth of the adjusting groove (5) is gradually increased from inside to outside.

2. Regulating valve for regulating small flows according to claim 1, characterized in that the curve of the variation of the depth of the regulating channel (5) is an equal percentage curve.

3. The regulating valve for regulating small flow according to claim 1, characterized in that the spherical cap (4) is hemispherical, a core holder (6) is further disposed on the valve core (2), the spherical cap (4) is located on the core holder (6), the valve rod (3) is connected with the core holder (6), a through hole (7) is disposed on the core holder (6), and the through hole (7) is communicated with the regulating groove (5).

4. Regulating valve for regulating small flows according to claim 3, characterized in that the valve stem (3), the spherical cap (4) and the cartridge (6) are integrally connected.

5. The regulating valve for regulating small flow according to claim 3, characterized in that a valve body (8) is arranged outside the valve seat (1), a dustproof sleeve (9) is sleeved outside the valve rod (3), the dustproof sleeve (9) is positioned at the joint of the valve rod (3) and the core seat (6), and a lower valve cover (10) is connected to the bottom of the valve body (8).

Technical Field

The invention relates to the technical field of regulating valves, in particular to a regulating valve for regulating small flow.

Background

In valve classification, a valve whose flow through the valve does not vary with inlet and outlet pressure fluctuations is referred to as a regulator valve. In the regulating valves supplied in the market at present, a V-shaped opening is generally designed on a ball core as a medium flow passage, and the valves adopt an eccentric structure and are beneficial to opening and closing of the valves.

As shown in fig. 1, CN202852050U discloses a low-temperature eccentric ball valve, in which a center B of a valve core spherical surface is disposed to the left with respect to a center line D of a valve stem, and the center line D of the valve stem is disposed to the lower with respect to a center line C of a flow passage, so as to form a double eccentric structure, thereby enhancing the sealing performance of the product. As shown in fig. 2, which is a cross-sectional view a-a of fig. 1, the flow channel on the valve element is designed along the surface of the valve element. As shown in fig. 1 and 2, the valve element is not a full sphere, and the spherical surface occupies only about 1/4 of the entire sphere. And only the edge of the outer surface of the valve core is provided with a V-shaped flow passage, as shown in figure 3, so that the adjusting range of the valve core is smaller during adjusting. As shown by line E in fig. 13, which is a graph of the relative opening degree of the valve element and the flow rate of the existing eccentric ball valve, the adjustable relative opening degree of the existing eccentric ball valve is narrow in the adjustment process, and the adjustment accuracy is not very high due to the narrow adjustable relative opening degree; meanwhile, the valve core and the valve seat of the valve are in eccentric fit, the friction between the valve core and the valve seat is small due to the eccentric action, the valve core and the valve seat can be quickly separated when the opening is small, and particularly for small-caliber pipelines, the valve core and the valve seat are not easy to adjust due to low precision.

Disclosure of Invention

The invention provides an adjusting valve for adjusting small flow, aiming at the problems that the precision of an eccentric ball valve in the prior art cannot reach that of a V-shaped valve with an opening gradually increased at present for a small-diameter pipeline with a smaller diameter due to a narrow adjustable relative opening, and the small-diameter and high-precision control requirements cannot be met due to small opening and high medium flow speed of the V-shaped valve.

In order to achieve the above purpose, the invention provides the following technical scheme:

a regulating valve for regulating small flow comprises a valve seat and a valve core, wherein the valve seat is in contact connection with the valve core, a valve rod is connected to the valve core, a spherical crown is arranged on the valve core, a regulating groove is formed in the surface of the spherical crown, and the regulating groove does not exceed the center of the spherical crown; the depth of the regulating groove increases gradually from inside to outside.

Preferably, the depth variation curve of the adjustment groove is one of an equal percentage curve, a linear curve or a quick-opening characteristic curve. Different depth profiles can be selected according to the use requirement.

Preferably, the spherical crown is hemispherical, a strip-shaped core seat is further arranged on the valve core, the spherical crown is located on the core seat, the valve rod is connected with the core seat, a through hole is formed in the core seat, and the through hole is communicated with the adjusting groove. Through setting up the through-hole on the core print, just can make the medium follow through-hole internal flow when the case rotates 90 after to satisfy large-traffic demand. In order to reduce the friction between the valve core and the valve seat and reduce the damage to the valve core in the process that the valve rod drives the valve core to rotate, the core seat connected with the spherical crown is arranged instead of arranging the valve core into a whole spherical shape.

Preferably, the valve rod, the spherical crown and the core print are integrally connected, and the valve rod and the core print are integrated, so that the gap between the valve rod and the valve core can be reduced, and the adjustment is more convenient.

Preferably, the outside of disk seat is equipped with the valve body, the valve rod overcoat is equipped with the dirt proof boot, the dirt proof boot is located the valve rod with the core print handing-over department, the bottom of valve body is connected with lower valve gap.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the adjusting groove is arranged on the spherical crown, the width of the adjusting groove from inside to outside is not changed, the depth of the adjusting groove is gradually increased from one side close to the center of the spherical crown to outside, and a medium flows into the adjusting groove along with the rotation of the spherical crown, so that the flow of the adjusting valve can be controlled through the depth of the adjusting groove. The invention relates to a regulating valve for regulating small flow, which is characterized in that a V-shaped opening is formed in a spherical crown at present, the width of the opening is increased along with the increase of the opening degree of the spherical crown, so that the flow inlet is regulated.

Description of the drawings:

FIG. 1 is a schematic structural diagram of an eccentric regulating valve in the prior art;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of a conventional valve cartridge;

FIG. 4 is a cross-sectional view of a closed state of a regulator valve for regulating small flow provided by the present invention;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 6 is a first schematic view of the valve cartridge of FIG. 2 after rotation;

FIG. 7 is a second schematic view of the valve cartridge of FIG. 2 after rotation;

FIG. 8 is a schematic structural view of the valve cartridge;

FIG. 9 is an enlarged view of the valve cartridge of FIG. 2;

FIG. 10 is a left side view of the valve seat and poppet connection of FIG. 2;

FIG. 11 is a left side view of the valve seat and poppet connection of FIG. 3;

FIG. 12 is a left side view of the valve seat and poppet connection of FIG. 4;

FIG. 13 is a graph of relative spool opening versus flow rate for the same differential pressure.

The labels in the figure are: 1-valve seat, 2-valve core, 3-valve rod, 4-spherical crown, 5-regulating groove, 6-valve core seat, 7-through hole, 8-valve body, 9-dust-proof sleeve, 10-lower valve cover and 11-medium flow hole.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted" and "connected" are to be interpreted broadly, for example, communication between two elements may be achieved, direct connection may be achieved, indirect connection may be achieved through an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

As shown in fig. 4 to 8, the invention provides a regulating valve for regulating small flow, which comprises a valve seat 1 and a valve core 2, wherein the valve seat 1 is connected with the valve core 2 in a contact manner, and a valve rod 3 is connected on the valve core 2. Be equipped with hemispherical spherical crown 4 on case 2, case 2 includes hemispherical spherical crown 4 and bar-shaped core print 6, and spherical crown 4 sets up with core print 6 is integrative, and valve rod 3 also is an organic whole with core print 6 and is connected, can avoid having the clearance between valve rod 3 and the case 2 like this for case 2 is synchronous motion with valve rod 3 when adjusting, adjusts more accurately.

As shown in fig. 8 and 9, the surface of the spherical cap 4 is provided with an adjusting groove 5, the adjusting groove 5 does not exceed the center of the spherical cap 4, and the depth of the adjusting groove 5 gradually increases from the center of the spherical cap 4 to the outside. The depth curve of the regulating groove 5 from inside to outside can be designed into one of an equal percentage curve, a linear curve or a quick-opening characteristic curve according to requirements.

If the depth of the adjusting groove 5 is changed into a linear curve, the flow change caused by the change of the unit stroke opening degree is equal, the flow change is larger when the flow is small, the sensitivity is high, the control is not easy, the oscillation is easy to occur, and when the opening degree is large, the relative change value of the flow is small, and the adjustment is slow.

If the depth of the regulating groove 5 is of equal percentage type, the flow rate change is small when the stroke opening is small, and the flow rate change is large when the stroke opening is large, so that the method is suitable for a system with large load change amplitude, and is also of logarithmic characteristic type.

If the depth of the adjusting groove 5 is changed into a quick-opening curve type, and the stroke opening degree is small, the flow is large, and the flow can reach the maximum rapidly along with the increase of the stroke. When the depth curve of the adjusting groove 5 is used for a small-caliber pipeline, an equal percentage curve is preferably selected.

The existing V-shaped valve is always in close contact with the valve seat 1 when being adjusted, so that the friction between the valve core 2 and the valve seat 1 can be increased in the adjusting process, the adjustment cannot be carried out more accurately, and the service life of the valve core 2 can be shortened. Although the existing eccentric ball valve is provided with a V-shaped opening or other openings on the surface of the spherical crown, the relative opening degree of the spherical crown is smaller, the adjustable stroke of the whole spherical crown is shorter, and the precision of each point of adjustment is lower. This application sets up the equal width adjustment tank on the spherical crown, carries out flow control through the degree of depth that changes the adjustment tank to the regulation stroke of spherical crown has been increased, makes the precision of ball valve higher.

In order to reduce the friction between the valve core 2 and the valve seat 1 when the valve core 2 is opened, the center of the spherical surface of the spherical cap 4 and the center of the rotating shaft of the valve rod 3 are eccentrically arranged and do not coincide with each other, as shown in fig. 6, the rotating center of the valve rod 3 is an M point, the center of the cross section of the spherical cap 4 is an N point, and the N point is positioned on the side far away from the adjusting groove 5, and in the actual use process, the N point is generally deviated from the M point by 10-20 wires. Therefore, when the valve rod drives the spherical crown to rotate, the spherical crown has a certain eccentric angle relative to the axis of the rotation of the valve rod, and when the valve rod is opened, the spherical crown 4 is not clung to the valve seat 1, so that the friction between the spherical crown 4 and the valve seat 1 is reduced, and the service life of the valve core 2 is prolonged. In the existing eccentric valve, the eccentric distance between the center of the spherical surface of the spherical cap and the rotation center of the valve rod is about 2-3mm, and if the eccentricity is closer, the adjustment is more difficult because the V-shaped opening is formed on the surface of the spherical cap.

The valve rod 3 rotates around the point M, and because the point N is not coincident with the point M, when the valve core 2 rotates around the point M, when the valve core 2 is opened, a certain gap is formed between the spherical crown 4 near the adjusting groove 5 and the valve seat 1, so that the friction between the valve core 2 and the valve seat 1 is reduced, the friction is reduced, the adjusting precision is higher, and the service life of the valve core 2 can be prolonged. As shown in fig. 7, 8 and 9, the width of the adjustment groove 5 is constant all the way from the center of the spherical cap 4 to the outside.

The outside of disk seat 1 is equipped with valve body 8, 3 overcoat of valve rod is equipped with dirt proof boot 9, dirt proof boot 9 is located valve rod 3 with 6 handing-over departments of core print, the bottom of valve body 8 is connected with lower valve gap 10.

The spherical crown 4 is hemispherical, the valve core 2 is further provided with a strip-shaped core seat 6, the spherical crown 4 is located on the core seat 6, the valve rod 3 is connected with the core seat 6, the core seat 6 is provided with a through hole 7, and the through hole 7 is communicated with the adjusting groove 5.

As shown in fig. 6, in the closed state, the central portion of the spherical cap 4 is blocked by the medium flow hole 11 contacting with the valve seat 1, when the valve element 2 is rotated and the adjustment groove 5 is slightly opened, the distance between the valve seat 1 and the bottom of the adjustment groove is the opening degree of the adjustment groove, the adjustment groove 5 enters the range of the medium flow hole 11, and the medium flows to the right side along the adjustment groove 5, as shown in fig. 3 and 8.

With the continuous rotation of the valve core 2, the opening degree of the adjusting groove is continuously increased, as shown in fig. 7 and 12, because the depth H of the adjusting groove 5 is gradually increased along with the rotation of the valve core 2, when a large flow is needed, the valve core 2 is rotated by 90 degrees, so that the medium can flow through the through hole 7 of the valve core seat 6.

As shown in fig. 13, the curve E is a relative opening degree and relative flow rate curve of the eccentric ball valve of the prior art, and the opening curve of the V-shaped port is an involute curve, and as can be seen from fig. 13, when the relative opening degree is about 0.1% to 17%, the control is good, but when the relative opening degree is more than 17%, the control between the relative opening degree and the relative flow rate is not related to the opening on the spherical crown. The curve F is a curve of the relative opening degree and the relative flow of the micro-eccentric ball valve, and as can be seen from the graph, the depth change curve of the adjusting groove represented by the curve F in the graph is an involute curve, and the adjusting valve for adjusting the small flow provided by the application can enable the valve core to be controllably adjusted when the relative opening degree is 0.1% -80%.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.