Regulating valve with stable sealing structure

Abstract

The utility model discloses a regulating valve with a stable sealing structure, which is characterized by comprising a valve body, a valve seat positioned in the valve body and a valve core forming hard seal with the valve seat, the valve core comprises a connecting part, a sealing part and a penetrating part which are connected in sequence, the valve core further comprises a slow flow part positioned between the sealing part and the penetrating part, and the valve core is connected with the connecting part. The flow slowing part and the sealing part are coaxially arranged, a flow expanding ring groove coaxial with the sealing part is formed in the circumferential wall of the flow slowing part, and the edges of the two opposite groove walls of the flow expanding ring groove are connected with the sealing part and the penetrating and inserting part correspondingly. A medium flows through the flow expanding ring groove, so that the flow speed of the medium flowing out of the flow expanding ring groove and flowing to the position between the sealing part and the valve seat is reduced, and the problem that in the prior art, a sealing structure is prone to abrasion, and consequently the sealing performance is reduced is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, and more specifically to a regulating valve with a stable sealing structure. Background Art

[0002] A regulating valve is a device used to change the flow rate of gas or liquid and achieve a certain requirement. It belongs to a precision control instrument and is usually composed of a master control device and other accessories. It can achieve the opening and closing action only by receiving the signal from the regulating instrument, so as to achieve the required purpose. The regulating valve is mainly used for controlling the measurement parameters such as pressure, liquid level and temperature in the automatic control of industrial production process, and can also be used as an intermediate relay in the remote continuous monitoring system and computer control system, playing an important role in the automatic regulation and control of fluids.

[0003] Referring to Figure 1 As shown, the valve core of the existing regulating valve includes a connecting part connected to the valve rod, a sealing part that can fit with the valve seat, and an inserting part that penetrates through the valve seat. The outer surface of the inserting part is approximately hemispherical. During the process that the inserting part gradually penetrates through the valve seat, the distance between the inner wall of the valve seat and the outer surface of the inserting part gradually decreases, resulting in the flow rate of the medium flowing through the gap between the sealing part and the valve seat becoming faster and the pressure becoming larger, leading to the sealing surface between the sealing part and the valve seat wearing faster and the sealing performance decreasing, and at the same time generating noise. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a regulating valve with stable sealing performance and no noise.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A regulating valve with a stable sealing structure, including a valve body, a valve seat positioned in the valve body, and a valve core that forms a hard seal with the valve seat. The valve core includes a connecting part, a sealing part, and an inserting part connected in sequence. The valve core further includes a flow buffering part located between the sealing part and the inserting part. The flow buffering part is coaxially arranged with the sealing part. An expansion flow ring groove coaxial with the sealing part is arranged on the peripheral wall of the flow buffering part. The two groove wall edges of the expansion flow ring groove facing each other are respectively connected to the sealing part and the inserting part. The medium flows through the expansion flow ring groove, so that the flow rate of the medium flowing out of the expansion flow ring groove and flowing towards the gap between the sealing part and the valve seat decreases.

[0006] As a further improvement of the utility model, the groove wall of the expansion flow ring groove connected to the sealing part is arc-shaped.

[0007] As a further improvement of the utility model, the groove wall of the expansion flow ring groove connected to the inserting part is inclined relative to the vertical plane.

[0008] As a further improvement of the utility model, the groove bottom of the expansion flow ring groove is arc-shaped and convex towards the center of the flow buffering part.

[0009] Advantages of the present utility model: By allowing the medium to flow through the flow-expanding ring groove, the flow rate of the medium flowing out of the flow-expanding ring groove and flowing towards the sealing part and the valve seat is reduced. Such a design can slow down the medium flowing between the sealing part and the valve seat compared with the prior art, effectively reducing the erosion degree of the medium on both the sealing part and the valve seat, ensuring the stability of the sealing surface structure of both the sealing part and the valve seat, indirectly improving the sealing performance, and at the same time, the reduction of the flow rate of the medium can reduce the noise generated during flow. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the prior art;

[0011] Figure 2 is a schematic structural diagram of the present utility model;

[0012] Figure 3 is Figure 2 an enlarged view of part A in

[0013] Figure 4 is a three-dimensional view of the valve core in the present utility model.

[0014] Reference signs: 1, valve body; 2, valve seat; 3, valve core; 31, connecting part; 32, sealing part; 33, inserting part; 34, flow-slowing part; 35, flow-expanding ring groove. Detailed Embodiments

[0015] The present utility model will be further described in detail below with reference to the drawings and embodiments. The same components are denoted by the same reference signs.

[0016] Referring to Figures 1 to 4 as shown, a regulating valve with a stable sealing structure in this embodiment includes a valve body 1, a valve seat 2 positioned in the valve body 1, and a valve core 3 that forms a hard seal with the valve seat 2. The valve core 3 includes a connecting part 31, a sealing part 32, and an inserting part 33 that are connected in sequence;

[0017] Based on the aforementioned prior art, the blank of the valve core 3 is clamped on a lathe, and the connecting part 31, the sealing part 32, the flow-slowing part 34, and the inserting part 33 are sequentially machined on the valve core 3 by turning. A flow-expanding ring groove 35 coaxial with the sealing part 32 is machined on the peripheral wall of the flow-slowing part 34, and the two groove wall edges of the flow-expanding ring groove 35 facing each other are respectively connected to the sealing part 32 and the inserting part 33;

[0018] During the process of the valve core 3 moving towards the valve seat 2, the insertion part 33 first enters the inner cavity of the valve seat 2. The distance between the inner wall of the valve seat 2 and the insertion part 33 gradually decreases along the opening direction of the valve core 3. When the flow-attenuating part 34 enters the inner cavity of the valve seat 2, there is a minimum gap between the insertion part 33 and the valve seat 2, which can prevent some particulate impurities from reaching between the sealing part 32 and the valve seat 2. The velocity of the medium flowing from bottom to top gradually increases as the distance between the insertion part 33 and the valve seat 2 changes. At this time, the distance between the sealing part 32 and the valve seat 2 is large, and the scouring force of the medium on the sealing surfaces of both the sealing part 32 and the valve seat 2 is small. As the flow-attenuating part 34 continues to penetrate into the inner cavity of the valve seat 2, the sealing part 32 gradually approaches the valve seat 2, and a chamber for the medium to enter is formed between the diffusion ring groove 35 and the inner wall of the valve seat 2. When the medium flows through the insertion part 33 and enters the diffusion ring groove 35, the medium first fills the diffusion ring groove 35 and flows towards the gap between the sealing part 32 and the valve seat 2. The flow velocity of the medium decreases and becomes gentle in the diffusion ring groove 35, and the scouring force of the medium on the sealing surfaces of both the sealing part 32 and the valve seat 2 is small until the sealing part 32 is in close contact with the valve seat 2 and the medium stops flowing;

[0019] Such a design can slow down the medium flowing between the sealing part 32 and the valve seat 2 compared with the prior art, effectively reduce the scouring degree of the medium on both the sealing part 32 and the valve seat 2, ensure the structural stability of the sealing surfaces of both the sealing part 32 and the valve seat 2, indirectly improve the sealing performance, and at the same time, the decrease in the flow velocity of the medium can reduce the noise generated during flow.

[0020] As a specific embodiment of the improvement, referring to Figure 3 and Figure 4 As shown, the groove wall where the diffusion ring groove 35 is connected to the sealing part 32 is arc-shaped. When the medium rushes into the diffusion ring groove 35 and impacts on the arc surface, the flow direction of the medium changes under the guidance of the arc surface, the flow velocity of the medium decreases, and the scouring effect on the groove wall of the diffusion ring groove 35 is small. Such a design can effectively slow down the structural wear degree of the diffusion ring groove 35 compared with the design where the groove wall of the diffusion ring groove 35 is a plane, and prolong the service life of the valve core 3.

[0021] As a specific embodiment of the improvement, referring to Figure 3 and Figure 4 As shown, the groove wall where the diffusion ring groove 35 is connected to the insertion part 33 is inclined relative to the vertical plane. After the valve core 3 is opened upward, the medium and impurities in the diffusion ring groove 35 flow out of the diffusion ring groove 35 along the inclined groove wall. Such a design can avoid the phenomenon that impurities accumulate and adhere in the diffusion ring groove 35 compared with the design where the groove wall where the diffusion ring groove 35 is connected to the insertion part 33 is a horizontal plane, which is beneficial to the repeated use of the diffusion ring groove 35.

[0022] As a specific embodiment of the improvement, referring to Figure 3 and Figure 4As shown, the bottom of the flow-expanding annular groove 35 is an arc surface and convex towards the center of the flow-slowing portion 34. Such a design can further slow down the scouring effect on the inner wall of the flow-expanding annular groove 35 when the medium first enters the flow-expanding annular groove 35, effectively improving the structural stability of the flow-expanding annular groove 35.

[0023] The above description is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A regulating valve with a stable sealing structure, comprising a valve body (1), a valve seat (2) positioned in the valve body (1), and a valve core (3) forming a hard seal with the valve seat (2), wherein the valve core (3) comprises a connecting portion (31), a sealing portion (32), and an interpenetrating portion (33) connected in sequence, and characterized in that: The valve core (3) further comprises a slow flow portion (34) located between the sealing portion (32) and the insertion portion (33); the slow flow portion (34) is coaxially arranged with the sealing portion (32); a flow expansion annular groove (35) coaxial with the sealing portion (32) is arranged on a peripheral wall of the slow flow portion (34); two groove wall edges of the flow expansion annular groove (35) facing each other are respectively connected with the sealing portion (32) and the insertion portion (33); a medium flows through the flow expansion annular groove (35), so that a flow velocity of the medium flowing out of the flow expansion annular groove (35) and flowing toward between the sealing portion (32) and the valve seat (2) is reduced.

2. A regulating valve with a stable sealing structure according to claim 1, characterized in that: The groove wall where the expansion ring groove (35) connects with the sealing portion (32) is in an arc shape.

3. A regulating valve with a stable sealing structure according to claim 1 or 2, characterized in that: The groove wall where the expansion annular groove (35) and the insertion portion (33) are connected is arranged to be inclined relative to the vertical surface.

4. A regulating valve with a stable sealing structure according to claim 1 or 2, characterized in that: The bottom of the flow expansion annular groove (35) is an arc surface and convex toward the center of the slow flow portion (34).

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