阅读说明：本技术 一种调节阀耐冲蚀密封结构 (Erosion-resistant sealing structure of regulating valve ) 是由 姜皓 王恒 张含 刘春玲 龚胜泉 王周杰 李连翠 贾俊阳 于 2020-05-20 设计创作，主要内容包括：本发明公开了一种调节阀耐冲蚀密封结构,其特征在于：包括阀体、阀座、阀芯、与阀芯配合的套筒,所述阀体内设有用于介质通过的流道,所述流道包括流入段、缓冲段、阀腔段和流出段,所述缓冲段的横截面积大于流入段、阀腔段、流出段的横截面积,所述阀腔段的出口处设有阀座,所述套筒设于缓冲段,所述阀芯设于阀腔段和套筒内,阀芯的底端位于阀腔段的出口处,阀芯的底端与阀腔段的出口之间通过阀芯的底端与阀座接触形成密封面,阀芯的底端设有轴向突出结构,所述轴向突出结构凸出于阀芯的底端位于阀座内与阀座相互配合。本发明能够有效减轻介质对阀芯密封面的直接冲刷作用,保护阀芯密封面的完整性,延长阀芯使用周期。(The invention discloses an erosion-resistant sealing structure of a regulating valve, which is characterized in that: the flow channel for medium to pass through is arranged in the valve body and comprises an inflow section, a buffering section, a valve cavity section and an outflow section, the cross sectional area of the buffering section is larger than that of the inflow section, the valve cavity section and the outflow section, the valve seat is arranged at an outlet of the valve cavity section, the buffering section is arranged in the sleeve, the valve core is arranged in the valve cavity section and the sleeve, the bottom end of the valve core is located at the outlet of the valve cavity section, the bottom end of the valve core and the outlet of the valve cavity section are in contact with the valve seat through the bottom end of the valve core to form a sealing surface, an axial protruding structure is arranged at the bottom end of the valve core, and the axial protruding structure protrudes out of the bottom end of the valve core and is located in the valve. The invention can effectively reduce the direct scouring action of the medium on the sealing surface of the valve core, protect the integrity of the sealing surface of the valve core and prolong the service life of the valve core.)

1. The utility model provides a resistant erosion seal structure of governing valve which characterized in that: the medium flow passage type valve comprises a valve body (1), a valve seat (2), a valve core (3) and a sleeve (4) matched with the valve core (3), wherein a flow passage for medium to pass through is arranged in the valve body (1), the flow passage comprises an inflow section (1-1), a buffer section (1-2), a valve cavity section (1-3) and an outflow section (1-4), the cross sectional area of the buffer section (1-2) is larger than that of the inflow section (1-1), the valve cavity section (1-3) and the outflow section (1-4), the valve seat (2) is arranged at an outlet of the valve cavity section (1-3), the sleeve (4) is arranged in the buffer section (1-2), the valve core (3) is arranged in the valve cavity section (1-3) and the sleeve (4), the bottom end of the valve core (3) is arranged at the outlet of the valve cavity section (1-3), the bottom end of the valve core (3) is in contact with the outlet of the valve cavity section (1-3) through the bottom end of the valve core (3) to form a sealing surface with the valve seat (2), an axial protruding structure (5) is arranged at the bottom end of the valve core (3), and the axial protruding structure (5) protrudes out of the bottom end of the valve core (3) and is located in the valve seat (2) to be matched with the valve seat (2).

2. The erosion resistant seal structure of a regulator valve of claim 1, wherein: the axial protruding structure (5) comprises a vertical section (5-1) and an arc section (5-2), the vertical section (5-1) is perpendicular to the end face of the bottom end of the valve core (3) and is connected with the bottom end of the valve core (3), and the arc section (5-2) is connected with the vertical section (5-1) in a smooth transition mode and is located in the valve seat (2).

3. The erosion resistant seal structure of a regulator valve of claim 1, wherein: the end surface of the vertical section (5-1) is in the same shape and size as the end surface of the bottom end of the valve core (3), and the end surface of the vertical section (5-1) is in the same shape and size as the cross section of the inner cavity of the valve seat (2).

4. The erosion resistant seal structure of a regulator valve of claim 1, wherein: the sealing surface is formed by arranging a chamfer (3-1) at the bottom end of the valve core (3) to be in contact with the inner side surface of the top of the valve seat (2).

5. The erosion resistant seal structure of a regulator valve of claim 1, wherein: the cross-sectional area of the buffer section (1-2) is larger than that of the sleeve (4).

Technical Field

The invention relates to an erosion-resistant sealing structure of a regulating valve, and belongs to the field of processing engineering and valves.

Background

The existing regulating valve is composed of a valve body 21, a valve seat 22, a valve core 23, a sleeve 24, a valve rod 25 and the like, wherein the valve core 23 acts on the valve seat 22 to play a sealing role as shown in fig. 1. As shown in fig. 2 and 3, in the opening and closing process of the valve, a medium flows into the valve cavity through the sleeve 24, then the medium directly erodes and acts on the sealing surface of the valve element 23, and then flows out through the valve body flow passage 26, after long-term use, the medium can generate relatively serious erosion and abrasion on the sealing surfaces of the valve element 23 and the valve seat 22, the sealing surface of the valve element 23 is easily damaged, the tightness is reduced, the frequency of repairing the sealing surface of the valve element 23 or replacing a new valve element 23 is high, the service cycle of the valve element 23 is relatively short, and the repair of the sealing surface is a large and important work, and the maintenance cost is increased.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the problem that a valve core sealing surface of an existing regulating valve sealing structure is easily eroded by a medium is solved.

In order to solve the problems, the technical scheme of the invention is to provide an erosion-resistant sealing structure of a regulating valve, which is characterized in that: the flow channel for medium to pass through is arranged in the valve body and comprises an inflow section, a buffering section, a valve cavity section and an outflow section, the cross sectional area of the buffering section is larger than that of the inflow section, the valve cavity section and the outflow section, the valve seat is arranged at an outlet of the valve cavity section, the buffering section is arranged in the sleeve, the valve core is arranged in the valve cavity section and the sleeve, the bottom end of the valve core is located at the outlet of the valve cavity section, the bottom end of the valve core and the outlet of the valve cavity section are in contact with the valve seat through the bottom end of the valve core to form a sealing surface, an axial protruding structure is arranged at the bottom end of the valve core, and the axial protruding structure protrudes out of the bottom end of the valve core and is located in the valve.

Preferably, the axial protrusion structure comprises a vertical section and an arc section, the vertical section is perpendicular to the end face of the bottom end of the valve core and is connected with the bottom end of the valve core, and the arc section and the vertical section are connected in a smooth transition mode and are located in the valve seat.

Preferably, the end surface of the vertical section is in the same shape and size as the end surface of the bottom end of the valve core, and the end surface of the vertical section is in the same shape and size as the cross section of the inner cavity of the valve seat.

Preferably, the sealing surface is formed by arranging a chamfer at the bottom end of the valve core to be in contact with the inner side surface of the top of the valve seat.

Preferably, the cross-sectional area of the buffer section is greater than the cross-sectional area of the sleeve.

Compared with the prior art, the invention has the beneficial effects that:

the axial protruding structure is arranged at the bottom end of the valve core, so that the direct scouring effect of the medium on the sealing surface of the valve core can be effectively reduced, the erosion and abrasion of the medium on the sealing surface of the valve core are reduced, the integrity of the sealing surface of the valve core is protected, the repairing or replacing frequency of the sealing surface of the valve core is reduced, the service cycle of the valve core is prolonged, and the maintenance cost is also reduced economically.

Drawings

FIG. 1 is a schematic view of a conventional regulator valve;

FIG. 2 is an enlarged schematic view of a portion of the valve cartridge of FIG. 1;

FIG. 3 is a schematic diagram of the operation process of the prior regulating valve when medium flows through the valve core;

FIG. 4 is a schematic view of an erosion resistant seal structure for a regulator valve according to the present invention;

FIG. 5 is an enlarged schematic view of a portion of the valve cartridge of FIG. 4;

fig. 6 is a schematic diagram of the working process of the medium flowing through the valve core.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in figures 4 and 5, the erosion-resistant sealing structure of the regulating valve comprises a valve body 1, a valve seat 2, a valve core 3 and a sleeve 4 matched with the valve core 3, wherein a flow passage for medium to pass through is processed in the valve body 1, the flow passage comprises an inflow section 1-1, a buffer section 1-2, a valve cavity section 1-3 and an outflow section 1-4, the cross section area of the buffer section 1-2 is larger than that of the inflow section 1-1, the valve cavity section 1-3 and the outflow section 1-4, the valve seat 2 is installed at an outlet of the valve cavity section 1-3, the sleeve 4 is installed in the buffer section 1-2, the cross section area of the buffer section 1-2 is larger than that of the sleeve 4, the valve core 3 passes through the valve cavity section 1-3 and the sleeve 4 and is located in the valve cavity section 1-3 and the sleeve 4, the bottom end of the valve core 3 is located at the outlet of the, and a chamfer 3-1 is processed at the bottom end of the valve core 3, and the chamfer 3-1 of the valve core 3 is contacted with the inner side surface of the top of the valve seat 2 to form a sealing surface for sealing the bottom end of the valve core 3 and an outlet of the valve cavity section 1-3. The bottom end of the valve core 3 is provided with an axial protruding structure 5, the axial protruding structure 5 protrudes out of the bottom end of the valve core 3 and is positioned in the valve seat 2 to be matched with the valve seat 2, the axial protruding structure 5 comprises a vertical section 5-1 and an arc section 5-2, the vertical section 5-1 is perpendicular to the bottom end face of the valve core 3 and is connected with the bottom end of the valve core 3, the shape and size of the end face of the vertical section 5-1 are consistent with the shape and size of the end face of the bottom end of the valve core 3, and the shape and size of the end face of the vertical section 5-1 are consistent with the shape and. The circular arc section 5-2 and the vertical section 5-1 are connected in a smooth transition way and are positioned in the valve seat 2.

The axial protruding structure 5 is a component of the valve core 3 and can be integrally formed with the valve core 3, when the valve of the valve body 1 is closed, the axial protruding structure 5 of the valve core 3 is arranged at an inner cavity flow channel of the sealing surface of the valve seat 2, namely at the position of the valve cavity section 1-3, and the axial protruding structure 5 of the valve core 3 can play a role in guiding and throttling; as shown in fig. 6, in the process of opening the valve, the axial protrusion structure 5 of the valve element 3 is initially disposed in the flow channel of the inner cavity of the valve seat 2, and when the axial protrusion structure 5 of the valve element 3 is not away from the valve seat 2, the axial protrusion structure 5 is not opened yet, no medium flows through the sealing surface of the valve element 3, so that no medium acting force is flushed on the sealing surface, and no erosion and abrasion effect is generated on the sealing surface; with the further opening of the valve, when the vertical section 5-1 of the axial protruding structure 5 of the valve core 3 completely leaves the valve seat, the medium starts to flow out from the middle cavity of the labyrinth sleeve 4, at this time, a certain amount of interval exists between the sealing surface of the valve core 3 and the sealing surface of the valve seat 2, and the medium directly washes the axial protruding structure 5 of the valve core 3 after passing through the middle cavity of the labyrinth sleeve 4 and then flows out through the outlet flow channel 6 of the valve body 1, and the direct washing effect on the sealing surface of the valve core 3 is avoided. Therefore, the erosion and abrasion of the sealing surface of the valve core 3 by the medium can be effectively reduced, and the effect of protecting the sealing surface is achieved. In the process of closing the valve, a medium flows out through the axial protruding structure 5 of the valve core 3 at the beginning, the axial protruding structure 5 is washed, the medium is not directly washed on the sealing surface, the sealing surface of the valve core 3 has no erosion and abrasion action, and the sealing surface of the valve core 3 can be effectively protected; with the further closing of the valve, when the axial protruding structure 5 of the valve core 3 is closed to the sealing surface of the valve seat 2, the medium does not flow out any more and does not erode the valve core 3 any more, at this time, the valve core 3 is continuously closed, no medium erodes and acts on the sealing surface, and the valve core 3 is not eroded and abraded by the medium any more.