Regulating valve based on redundant sealing structure

Abstract

The utility model relates to an adjusting valve based on a redundant sealing structure, which is provided with a valve body, a valve seat is embedded in the valve body between a feeding cavity and a discharging cavity, the upper end face of the valve body is fixedly connected with an upper valve cover, a valve rod is installed in the upper valve cover in a sliding mode, the bottom end of the valve rod is provided with a valve core of an integrated structure, and the valve core is provided with a conical section. The upper edge opening of the inner hole of the valve seat is provided with a chamfer, the chamfer is attached to the inclined face of the conical section to form a main sealing face, and the peripheral face of the valve element below the conical section is attached to the inner side face of the upper end of the inner hole of the valve seat to form an auxiliary sealing face. The outer peripheral surface of the valve core is attached to the inner side surface of the upper end of the inner hole of the valve seat to form the auxiliary sealing surface, when the valve tends to be closed, the auxiliary sealing surface plays a sealing role firstly, and when the valve tends to be opened, the main sealing surface is separated firstly, and then the auxiliary sealing surface is separated. Therefore, high-speed fluid is effectively prevented from impacting and wearing the main sealing surface under the action of the auxiliary sealing surface, the sealing performance of the valve is improved, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a regulating valve based on a redundant sealing structure. Background Art

[0002] The sealing surface of a traditional regulating valve is generally a single-channel sealing structure, which adopts a conical sealing form between the valve core and the valve seat, or a line seal or a face seal. If there is damage at the sealing part, the valve leakage will be large.

[0003] The valve core and valve seat structure of the traditional regulating valve is such that when the valve is in a small opening state, the valve core and the valve seat are separated. When the valve tends to close or open from a small opening, the high-speed fluid will pass through the gap between the valve core and the valve seat and have a great impact on the main sealing surface, thereby causing damage to the valve sealing surface and reducing the valve's sealing performance and service life. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides a regulating valve based on a redundant sealing structure to effectively avoid damage to the sealing surface caused by high-speed impact of the fluid.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a regulating valve based on a redundant sealing structure, comprising a valve body, a feed cavity on one side of the valve body, a discharge cavity on the other side of the valve body, a valve seat embedded in the valve body between the feed cavity and the discharge cavity, an upper valve cover fixedly connected to the upper end face of the valve body, a valve stem slidably installed in the upper valve cover, a valve core with an integrated structure at the bottom end of the valve stem, the valve core and the valve seat seal and cooperate to control the flow of medium between the feed cavity and the discharge cavity, the valve core has a conical section, the upper edge of the inner hole of the valve seat has a chamfer, the chamfer and the inclined surface of the conical section are fitted to form a main sealing surface, and the outer peripheral surface of the valve core below the conical section is fitted to the inner side surface of the upper end of the inner hole of the valve seat to form a secondary sealing surface.

[0006] Specifically, the valve core includes a first cylindrical section and a sealing section. The first cylindrical section is integrally fixed to the bottom of the valve stem. The sealing section is inserted into the inner hole of the valve seat to cooperate in controlling the flow of the medium. The large end of the conical section is connected to the first cylindrical section. The small end of the conical section is connected to the second cylindrical section. The second cylindrical section is connected to the sealing section. The sealing section gradually contracts inwardly from the connection with the second cylindrical section. The outer side surface of the second cylindrical section fits with the inner side surface of the upper end of the inner hole of the valve seat to form a secondary sealing surface.

[0007] Furthermore, the upper portion of the upper valve cover has a packing cavity, a packing assembly is arranged in the packing cavity, a gland assembly for pressing the packing assembly is arranged above the packing assembly, and the upper end of the valve stem extends out of the gland assembly.

[0008] Furthermore, the upper end surface of the upper valve cover is fixedly connected with a pressure plate for pressing the gland assembly.

[0009] The beneficial effect of the utility model is that the utility model forms a secondary sealing surface by fitting the outer peripheral surface of the valve core with the inner side surface of the upper end of the inner hole of the valve seat. When the valve tends to close, the secondary sealing surface first performs a sealing function, and when the valve tends to open, the main sealing surface is separated first and the secondary sealing surface is separated later, thereby relying on the secondary sealing surface to effectively prevent high-speed fluid from impacting and wearing the main sealing surface, thereby improving the sealing performance and service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0013] Figure 3 It is a structural schematic diagram of the valve core of the utility model.

[0014] In the figure: 1. valve body, 1-1. feed chamber, 1-2. discharge chamber, 2. valve seat, 2-1. chamfer, 3. upper valve cover, 4. valve stem, 5. valve core, 5-1. conical section, 5-2. first cylindrical section, 5-3. sealing section, 5-4. second cylindrical section, 6. primary sealing surface, 7. secondary sealing surface, 8. packing assembly, 9. gland assembly, 10. pressure plate. DETAILED DESCRIPTION

[0015] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0016] like Figure 1 , Figure 2 A regulating valve based on a redundant sealing structure is shown, comprising a valve body 1, a feed chamber 1-1 for inputting fluid on the left side of the valve body 1, a discharge chamber 1-2 for discharging fluid on the right side of the valve body 1, a stepped channel is provided in the valve body 1 between the feed chamber 1-1 and the discharge chamber 1-2, a valve seat 2 is embedded in the stepped channel, an upper valve cover 3 is fixedly connected to the upper end face of the valve body 1, a valve stem 4 is slidably installed in the upper valve cover 3, and a valve core 5 of an integrated structure is provided at the bottom end of the valve stem 4, the valve core 5 and the valve seat 2 are sealed and cooperated to control the flow of the medium between the feed chamber 1-1 and the discharge chamber 1-2.

[0017] A packing cavity is provided at the upper part of the upper valve cover 3, in which a packing assembly 8 is arranged, a gland assembly 9 is provided above the packing assembly 8, a pressing plate 10 for pressing the gland assembly 8 is fixedly connected to the upper end surface of the upper valve cover 3, the gland assembly 8 presses the packing assembly 8, and the upper end of the valve stem 4 extends out of the pressing plate 10 through the packing assembly 8 and the gland assembly 9.

[0018] like Figure 3 As shown, the valve core 5 includes a conical section 5-1, a first cylindrical section 5-2, a sealing section 5-3 and a second cylindrical section 5-4 from top to bottom, wherein the first cylindrical section 5-2 is integrally fixed to the bottom of the valve stem 4, the large end of the conical section 5-1 is connected to the first cylindrical section 5-2, the small end of the conical section 5-3 is connected to the second cylindrical section 5-4, the second cylindrical section 5-4 is connected to the sealing section 5-3, the sealing section 5-3 gradually contracts inwardly from the connection with the second cylindrical section 5-4, and the sealing section 5-3 cooperates with the inner hole of the valve seat 2 to control the flow of the medium.

[0019] The upper edge of the inner hole of the valve seat 2 has a chamfer 2-1, and a stepped hole with a larger aperture than the inner hole of the valve seat 2 is provided below the chamfer 2-1. When the inclined surface of the conical section 5-1 fits with the chamfer 2-1, a main sealing surface 6 is formed. The lower end of the outer side surface of the second cylindrical section 5-4 fits with the inner side surface of the upper end of the inner hole of the valve seat 2 connected to the stepped hole to form a secondary sealing surface 7.

[0020] During normal use, the valve core 5 is out of contact with the valve seat 2, and the fluid entering from the feed cavity 1-1 flows into the discharge cavity 1-2 through the inner hole of the valve seat 2. When the valve is closing, the valve core 5 gradually enters the inner hole of the valve seat 2, and the secondary sealing surface 7 plays a sealing role first, thereby preventing the high-speed fluid from impacting the main sealing surface 6 and causing damage to the main sealing surface 6; similarly, when the valve is opening, the main sealing surface 6 is out of the sealing state first, and the secondary sealing surface 7 is out of the state later, and the secondary sealing surface 7 can effectively prevent the high-speed fluid from impacting the main sealing surface 6.

[0021] The utility model forms a conical main sealing surface 6 by fitting the inclined surface of the conical section 5-1 of the valve core 5 with the chamfer 2-1 of the upper edge of the inner hole of the valve seat 2, and forms a cylindrical secondary sealing surface 7 by fitting the lower end of the outer side surface of the second cylindrical section 5-4 of the valve core 5 with the inner side surface of the upper end of the inner hole of the valve seat 2, so as to realize redundant sealing between the valve core 5 and the valve seat 2. When the valve tends to close or open, the pilot sealing effect of the secondary sealing surface 7 is relied on to effectively prevent the high-speed fluid from impacting and wearing the main sealing surface 6, thereby improving the sealing performance and service life of the valve.

[0022] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A regulating valve based on a redundant sealing structure, comprising a valve body (1), a feed cavity (1-1) on one side of the valve body (1), a discharge cavity (1-2) on the other side of the valve body (1), a valve seat (2) embedded in the valve body (1) between the feed cavity (1-1) and the discharge cavity (1-2), an upper valve cover (3) fixedly connected to the upper end surface of the valve body (1), a valve stem (4) slidably mounted in the upper valve cover (3), a valve core (5) of an integral structure at the bottom end of the valve stem (4), the valve core (5) and the valve seat (2) sealingly cooperate to control the flow of a medium between the feed cavity (1-1) and the discharge cavity (1-2), wherein: The valve core (5) has a conical section (5-1), and the upper edge of the inner hole of the valve seat (2) has a chamfer (2-1). The chamfer (2-1) and the inclined surface of the conical section (5-1) fit together to form a main sealing surface (6). The outer peripheral surface of the valve core (5) below the conical section (5-1) fits with the inner side surface of the upper end of the inner hole of the valve seat (2) to form a secondary sealing surface (7).

2. The regulating valve based on the redundant sealing structure according to claim 1, characterized in that: The valve core (5) comprises a first cylindrical section (5-2) and a sealing section (5-3); the first cylindrical section (5-2) is integrally fixed to the bottom of the valve stem (4); the sealing section (5-3) is inserted into the inner hole of the valve seat (2) to cooperate in controlling the flow of the medium; the large end of the conical section (5-1) is connected to the first cylindrical section (5-2); the small end of the conical section (5-1) is connected to the second cylindrical section (5-4); the second cylindrical section (5-4) is connected to the sealing section (5-3); the sealing section (5-3) gradually contracts inwardly from the point where it is connected to the second cylindrical section (5-4); the outer side surface of the second cylindrical section (5-4) fits with the inner side surface of the upper end of the inner hole of the valve seat (2) to form a secondary sealing surface (7).

3. The regulating valve based on the redundant sealing structure according to claim 1, characterized in that: The upper part of the upper valve cover (3) is provided with a packing cavity, in which a packing assembly (8) is arranged, and above the packing assembly (8) is provided a gland assembly (9) for pressing the packing assembly (8), and the upper end of the valve stem (4) extends out of the gland assembly (9).

4. The regulating valve based on the redundant sealing structure according to claim 3, characterized in that: The upper end surface of the upper valve cover (3) is fixedly connected with a pressing plate (10) for pressing the gland assembly (9).

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