A circular truncated cone plunger control valve

Abstract

The application discloses a circular-truncated-cone plunger control valve, which comprises a valve body, a material inlet is formed in the side wall of the valve body, a material outlet is formed in the bottom of the valve body, a cylindrical intermediate cavity is arranged in the valve body, a plunger gate is arranged in the intermediate cavity, the plunger gate can reciprocate along the axis direction of the intermediate cavity, a plurality of compressed air blowing pipes are arranged in the circumferential direction of the valve body and are used for blowing off solid particles in the valve body, a pneumatic power source is driven by compressed air, motion is transmitted through a valve rod, the plunger gate is driven to move, the working frequency of the pneumatic power source is adjusted, the reciprocating motion of the plunger gate is controlled, the conventional 'full-on / full-off' state is broken, the airflow and the material flow direction are reversed, downstream air enters the valve body from the material outlet, at this time, the reciprocating motion of the plunger gate forms a pulse type discharging channel, a plurality of plunger valves can be matched with each other, material sealing, air locking and pressure locking and horizontal conveying are realized.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and more specifically, to a frustum plunger control valve. Background Technology

[0002] As a commonly used device in the field of fluid control, the plunger valve is widely used for fluid on / off control and regulation under various conventional operating conditions due to its advantages of simple structure, good sealing performance, and long service life. Its core working principle is to achieve fluid control through the reciprocating motion of the plunger in the valve body, which closely cooperates with the valve seat.

[0003] However, existing plunger valves have significant limitations in high-temperature, high-pressure environments and in media containing solid particles. Firstly, high temperatures degrade the mechanical properties of the valve body, plunger, and sealing materials, leading to aging, deformation, or failure of seals and causing media leakage. Secondly, high-pressure environments easily cause stress concentration in the valve body and plunger structure, resulting in deformation or even cracking, affecting equipment safety and service life. Thirdly, solid particles easily accumulate on the sealing surfaces of the plunger and valve seat, causing seal failure or plunger jamming. Furthermore, under high temperature and pressure, particles exacerbate seal wear, further reducing equipment reliability.

[0004] In existing technologies, the aforementioned problems are mostly addressed by using filtration devices or regular maintenance. However, these methods fail to fundamentally resolve the core contradiction between structural design and material compatibility, resulting in high maintenance costs and limited effectiveness for plunger valves. Therefore, there is an urgent need to develop a plunger valve device that can operate stably under high temperature and high pressure environments while effectively resisting the effects of solid particles. Summary of the Invention

[0005] This invention provides a frustum plunger control valve, which can solve the problem that existing plunger valves are difficult to operate stably under high temperature and high pressure environments and cannot effectively resist the influence of solid particles.

[0006] A frustum plunger control valve includes a valve body, wherein a material inlet is provided on the side wall of the valve body, a material outlet is provided at the bottom, and a cylindrical intermediate cavity is provided inside the valve body. A plunger gate is provided in the intermediate cavity. The plunger gate can reciprocate along the axial direction of the intermediate cavity. A valve stem is fixedly installed at the top of the plunger gate. The bottom of the plunger gate is shaped like a frustum and cooperates with the sealing surface at the bottom of the valve body to form a sealing structure. The valve body is connected to the valve cover, the valve cover is connected to the pneumatic power source, and the valve stem passes through the valve cover and is connected to the pneumatic power source and the plunger gate respectively. The valve body is circumferentially arranged with multiple compressed air jet pipes for blowing away solid particles inside the valve body.

[0007] The frustum plunger control valve provided by this invention has, but is not limited to, the following beneficial effects compared to the prior art: This frustum-shaped plunger control valve is pneumatically powered by compressed air. The movement is transmitted through the valve stem, driving the plunger gate to move. The plunger gate moves upward until it separates from the sealing surface at the bottom of the valve body. At this point, the material inlet and outlet form a through channel through the intermediate cavity. The medium enters the valve body from the material inlet, flows downward along the inner wall of the intermediate cavity, and finally exits from the material outlet, completing the forward conveying. The plunger gate moves downward until it comes into contact with the sealing surface at the bottom of the valve body, cutting off the connection between the material inlet, outlet, and intermediate cavity. At this point, the material enters the valve body from the inlet. The medium is blocked at the top of the central cavity by the plunger gate, and no medium is discharged from the material outlet, achieving complete shut-off. By adjusting the working frequency of the pneumatic power source, the plunger gate is controlled to reciprocate, breaking the conventional "full-on / full-off" state and reversing the flow direction of air and material. That is, downstream air enters the valve body from the material outlet. At this time, the reciprocating motion of the plunger gate forms a pulse-type feeding channel. With the auxiliary blowing of the compressed air jet pipe, solid particles in the central cavity of the valve body are removed, ensuring sealing reliability. Multiple plunger valves cooperate with each other to achieve lateral material conveying with sealed air and pressure. Its design not only solves the sealing failure problem of conventional plunger valves under harsh working conditions, but also improves control accuracy and equipment durability, thereby improving the stability of the equipment and effectively resisting the influence of solid particles.

[0008] Furthermore, the external structure of the valve body is any one of a cylinder, cone, frustum, column, or polygon, and the outer shell of the valve body is made of high-temperature resistant steel and filled with heat-resistant and fire-resistant materials.

[0009] Furthermore, an inlet connecting pipe and flange are provided at the material inlet, and an outlet connecting pipe and flange are provided at the material outlet. Both the inlet connecting pipe and flange and the outlet connecting pipe and flange are made of high-temperature resistant alloy material.

[0010] Furthermore, the outer layer of the plunger gate is made of high-temperature resistant cast steel, and the interior is filled with refractory casting material.

[0011] Furthermore, the top of the plunger gate is fixedly connected to the valve stem.

[0012] Furthermore, the pneumatic power source is a compressed air driven structure, which can drive the valve stem to drive the plunger gate to reciprocate.

[0013] Furthermore, the valve stem is cylindrical, and a protective steel frame is fitted onto the valve stem, which is fixedly installed on the valve body.

[0014] Furthermore, the blowing angle and blowing pressure of the compressed air jet pipe can be adjusted according to the working conditions.

[0015] Furthermore, the valve cover is fitted onto a portion of the valve body, and the two are sealed and fixed together. The valve cover has a through hole for fitting the valve stem, and the size of the through hole is adapted to the cross-sectional shape of the valve stem.

[0016] Furthermore, the pneumatic power source is connected to the valve stem via a double-ear connector, which is made of alloy material. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a frustum plunger control valve according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Pneumatic power source; 2. Protective steel frame; 3. Valve stem; 4. Double-ear connector; 5. Plunger gate; 6. Inlet connecting pipe and flange; 7. Valve; 8. Compressed air jet pipe; 9. Outlet connecting pipe and flange. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Existing plunger valve designs are primarily geared towards conventional operating conditions, i.e., operation at normal temperature and pressure or moderate temperature and pressure. Under these conditions, the material selection, sealing design, and structural strength of the plunger valve usually meet the requirements. However, when plunger valves are applied to high-temperature and high-pressure environments, existing designs often face numerous challenges. First, high temperatures can degrade the mechanical properties of the valve body and plunger materials, especially the insufficient heat resistance of the sealing materials, making them prone to deformation or failure, leading to leakage. Second, high-pressure environments place higher demands on the structural strength of the valve body and plunger; conventionally designed plunger valves are prone to deformation or cracking under high pressure, affecting their service life and safety.

[0026] Furthermore, existing designs have significant shortcomings when plunger valves are used with media containing solid particles. Solid particles easily accumulate on the sealing surface between the plunger and the valve seat, leading to seal failure or plunger jamming. Especially under high temperature and high pressure environments (high temperature environments typically refer to temperatures above 800°C, and high pressure refers to temperatures exceeding 1 bar, or 100 kPa), the presence of solid particles accelerates the wear of the seals, further reducing the reliability and service life of the plunger valve. Existing plunger valves typically address the solid particle problem with simple filtration devices or periodic maintenance, but these methods do not fundamentally solve the problem and increase maintenance costs and workload.

[0027] See Figure 1 As shown in the figure, an embodiment of the present invention provides a frustum plunger control valve, including a valve body, a material inlet on the side wall of the valve body, a material outlet at the bottom, and a cylindrical central cavity inside.

[0028] A plunger gate 5 is installed in the middle cavity. The plunger gate 5 can move back and forth along the axis of the middle cavity. A valve stem 3 is fixedly installed at the top of the plunger gate 5. The bottom of the plunger gate 5 is shaped like a frustum and cooperates with the sealing surface at the bottom of the valve body to form a sealing structure.

[0029] The valve body is connected to the valve cover, the valve cover is connected to the pneumatic power source 1, and the valve stem 3 passes through the valve cover and is connected to the pneumatic power source 1 and the plunger gate 5 respectively.

[0030] Multiple compressed air jet pipes 8 are arranged circumferentially on the valve body for blowing away solid particles inside the valve body.

[0031] In this embodiment, the pneumatic power source 1 is driven by compressed air, which transmits motion through the valve stem 3, driving the plunger gate 5 to move. The plunger gate 5 moves upward until it separates from the sealing surface at the bottom of the valve body. At this point, the material inlet and material outlet form a through channel through the intermediate cavity. The medium enters the valve body from the material inlet, flows downward along the inner wall of the intermediate cavity, and finally exits from the material outlet, completing the forward conveying. The plunger gate 5 moves downward until it comes into contact with the sealing surface at the bottom of the valve body, cutting off the communication path between the material inlet, material outlet, and intermediate cavity. At this point, the medium entering the valve body through the material inlet is blocked by the plunger gate 5 at the upper part of the intermediate cavity, and no medium is discharged from the material outlet, achieving complete shut-off. By adjusting the working frequency of the pneumatic power source 1, the plunger gate 5 is controlled to reciprocate, breaking the conventional "full open / full closed" state and realizing the reversal of the flow direction of airflow and material flow. That is, the downstream air (the gas-solid two-phase material that needs to be transported in reverse) enters the valve body from the material outlet. At this time, the reciprocating motion of the plunger gate 5 forms a pulse-type feeding channel. With the auxiliary blowing of the compressed air jet pipe 8, the solid particles in the middle cavity of the valve body are removed, ensuring the reliability of the seal. Multiple plunger valves cooperate with each other to finally realize the transverse conveying of material with sealed air and pressure.

[0032] This design not only solves the sealing failure problem of conventional plunger valves under harsh operating conditions, but also improves control accuracy and equipment durability, thereby enhancing equipment stability and effectively resisting the influence of solid particles.

[0033] In this frustum-shaped plunger control valve, the pneumatic power source 1 is located at the top, providing the power required for the plunger gate 5 to open and close. The pneumatic power source 1 uses high-temperature and corrosion-resistant pneumatic components, including but not limited to high-temperature corrosion-resistant pneumatic actuators (pneumatic actuators with titanium alloy cylinders and PTFE seals), ceramic-sealed pneumatic actuators (pneumatic actuators with zirconia ceramic seals and stainless steel cylinders), and high-temperature explosion-proof pneumatic actuators (single-acting pneumatic actuators with nickel-chromium steel cylinders and graphite seals), ensuring long-term stable operation under high-temperature and high-pressure environments. The valve stem 3 is made of tensile-resistant high-temperature alloy steel, with a special surface treatment to improve its tensile strength and corrosion resistance. The tensile-resistant high-temperature alloy steel stem extends from the pneumatic power source 1 into the valve body and is directly connected to the plunger gate 5.

[0034] In some embodiments, based on the actual usage environment, the pneumatic power source 1 may be replaced by a hydraulic cylinder or an electric motor drive device, all of which fall within the protection scope of this invention.

[0035] Optionally, the external structure of the valve body can be any one of cylindrical, conical, frustum, columnar, or polygonal shapes, and the valve body shell is made of high-temperature resistant steel and filled with heat-resistant and fire-resistant materials.

[0036] In this embodiment, the high-temperature resistant steel used for the valve body shell includes, but is not limited to, stainless steel, cobalt-based alloys, and nickel-based alloys. The valve body shell is made of steel sheet with an internal refractory castable material to withstand high-temperature and high-pressure environments and reduce heat loss.

[0037] Optionally, an inlet connecting pipe and flange 6 are provided at the material inlet, and an outlet connecting pipe and flange 9 are provided at the material outlet. Both the inlet connecting pipe and flange 6 and the outlet connecting pipe and flange 9 are made of high-temperature resistant alloy material.

[0038] In this embodiment, the inlet connecting pipe and the inlet connecting pipe in flange 6 are used to introduce high-temperature, high-pressure gas-solid two-phase media into the valve body. The flange is made of high-temperature resistant alloy material to ensure the sealing and durability of the connection. Correspondingly, the outlet connecting pipe and the connecting pipe in flange 9 are used to discharge the controlled media from the valve body. The flange is also made of high-temperature resistant alloy material to ensure reliable sealing under high-temperature and high-pressure environments.

[0039] The material inlet is located on one side of the valve body, and an opening with valve 7 is located on the other side of the valve body. Valve 7 is designed to withstand high temperatures and pressures, ensuring the safe and stable operation of the equipment. By closing valve 7, the valve body can achieve excellent sealing, effectively preventing media leakage.

[0040] Optionally, the outer layer of the plunger gate 5 is made of high-temperature resistant cast steel, and the interior is filled with refractory castable material. The top of the plunger gate 5 is fixedly connected to the valve stem 3.

[0041] In this embodiment, the high-temperature resistant cast steel includes, but is not limited to, stainless steel, cobalt-based alloys, and nickel-based alloys, and the refractory casting material is heat-resistant concrete. The inner and outer casting materials of the plunger gate 5 adopt one of the following two structural forms: the outer layer uses a high-temperature resistant cast steel sleeve, and the inner layer is cast with heat-resistant concrete; or the inner layer uses a high-temperature resistant cast steel structure, and the outer layer is cast with heat-resistant concrete. Both structural forms ensure a perfect match between the plunger gate 5 and the valve body, achieving strict sealing control and preventing material leakage. The aforementioned heat-resistant concrete includes, but is not limited to, silicate concrete, aluminate concrete, magnesium-aluminate concrete, and siliceous concrete.

[0042] Optionally, the pneumatic power source 1 is a compressed air driven structure, which can drive the valve stem 3 to drive the plunger gate 5 to reciprocate.

[0043] Optionally, the valve stem 3 is cylindrical, and a protective steel frame 2 is fitted onto the valve stem 3, which is fixedly installed on the valve body.

[0044] In this embodiment, the protective steel frame 2 is used to limit the valve stem 3, so that the valve stem 3 is not easy to shake while moving axially, and it can also protect the valve stem 3 to prevent it from deforming or breaking.

[0045] Optionally, the blowing angle and blowing pressure of the compressed air jet pipe 8 can be adjusted according to the working conditions.

[0046] In this embodiment, the compressed air jet pipe 8 is used to jet compressed air when the plunger gate 5 is closed to remove residual solid particles in the valve body and prevent particle accumulation from affecting the sealing performance. The arrangement angle and jet pressure of the compressed air jet pipe 8 can be adjusted according to specific working conditions to ensure the best cleaning effect.

[0047] Optionally, the valve cover is fitted onto a portion of the valve body, and the two are sealed and fixed. The valve cover has a through hole for fitting the valve stem 3, and the size of the through hole is adapted to the cross-sectional shape of the valve stem 3 to ensure the sealing performance of the valve stem 3 during its movement.

[0048] Optionally, the pneumatic power source 1 and the valve stem 3 are connected by a double-ear connector 4, which is made of alloy material.

[0049] In this embodiment, the dual-ear connector 4 can withstand tensile and torsional forces under high-temperature conditions, ensuring the stability and reliability of power transmission.

[0050] In this application, the frustum-shaped plunger control valve is driven by a pneumatic power source 1 to drive the valve stem 3, which in turn drives the plunger gate 5 to reciprocate within the valve body, thereby achieving on / off control of the medium. The specific working process is as follows: Open state: Pneumatic power source 1 pulls valve stem 3 through double-ear connector 4, causing plunger gate 5 to move upward and open the medium passage. High temperature and high pressure gas-solid two-phase medium enters the valve body through inlet connecting pipe and flange 6, and is discharged through outlet connecting pipe and flange 9.

[0051] In the closed state: the pneumatic power source 1 pushes the valve stem 3, causing the plunger gate 5 to move downwards and close the medium passage. During the closing process, compressed air is sprayed through the compressed air jet pipe 8 to remove residual solid particles in the valve body and ensure the sealing surface is clean.

[0052] Reverse transport: By controlling the switching frequency of the plunger gate 5 and the timing of the compressed air jet pipe 8, reverse transport of the gas-solid two-phase medium is achieved.

[0053] This frustum-shaped plunger control valve boasts advantages such as high temperature and pressure resistance, strict sealing, efficient control, and long service life. Specifically, by employing high-temperature resistant materials and thermal insulation design, it can withstand high-temperature and high-pressure environments, making it suitable for reverse transport of gas-solid two-phase media. The matching design between the plunger gate 5 and the valve body, combined with the cleaning function of the compressed air jet pipe 8, ensures strict sealing control. The coordinated design of the pneumatic power source 1 and the valve stem 3 enables rapid and precise control of the plunger gate 5, meeting the needs of industrial automation. Through reasonable material selection and structural design, the service life and reliability of this frustum-shaped plunger control valve are significantly improved. These advantages make the plunger valve device of this invention widely used in high-temperature and high-pressure air and material pipelines in the cement, metallurgy, and chemical industries, and it is particularly suitable for the reverse transport process control of gas-solid two-phase media.

[0054] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A frustum-shaped plunger control valve, characterized in that, The valve body includes a material inlet on its side wall, a material outlet at its bottom, and a cylindrical central cavity inside. A plunger gate (5) is provided in the intermediate cavity. The plunger gate (5) can reciprocate along the axial direction of the intermediate cavity. A valve stem (3) is fixedly installed at the top of the plunger gate (5). The bottom of the plunger gate (5) is in the shape of a frustum and cooperates with the sealing surface at the bottom of the valve body to form a sealing structure. The valve body is connected to the valve cover, the valve cover is connected to the pneumatic power source (1), and the valve stem (3) passes through the valve cover and is connected to the pneumatic power source (1) and the plunger gate (5) respectively. The valve body is circumferentially arranged with multiple compressed air jet pipes (8) for blowing away solid particles inside the valve body.

2. The frustum plunger control valve as described in claim 1, characterized in that, The external structure of the valve body can be any one of cylindrical, conical, frustum, columnar, or polygonal shapes. The outer shell of the valve body is made of high-temperature resistant steel and is filled with heat-resistant and fire-resistant materials.

3. The frustum plunger control valve as described in claim 1, characterized in that, An inlet connecting pipe and flange (6) are provided at the material inlet, and an outlet connecting pipe and flange (9) are provided at the material outlet. Both the inlet connecting pipe and flange (6) and the outlet connecting pipe and flange (9) are made of high-temperature resistant alloy material.

4. The frustum plunger control valve as described in claim 1, characterized in that, The outer layer of the plunger gate (5) is made of high-temperature resistant cast steel, and the interior is filled with refractory casting material.

5. The frustum plunger control valve as described in claim 4, characterized in that, The top of the plunger gate (5) is fixedly connected to the valve stem (3).

6. The frustum plunger control valve as described in claim 1, characterized in that, The pneumatic power source (1) is a compressed air driven structure, which can drive the valve stem (3) to drive the plunger gate (5) to reciprocate.

7. The frustum plunger control valve as described in claim 1, characterized in that, The valve stem (3) is cylindrical, and a protective steel frame (2) is fitted on the valve stem (3). The protective steel frame (2) is fixedly installed on the valve body.

8. The frustum plunger control valve as described in claim 1, characterized in that, The spray angle and spray pressure of the compressed air jet pipe (8) can be adjusted according to the working conditions.

9. The frustum plunger control valve as described in claim 1, characterized in that, The valve cover is fitted onto a portion of the valve body and the two are sealed and fixed together. The valve cover has a through hole for fitting the valve stem (3), and the size of the through hole is adapted to the cross-sectional shape of the valve stem (3).

10. The frustum plunger control valve as described in claim 1, characterized in that, The pneumatic power source (1) is connected to the valve stem (3) via a double-ear connector (4), which is made of alloy material.

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