Special three-way heat preservation stop valve for asphalt

Abstract

The utility model discloses a three-way heat preservation stop valve special for asphalt, and relates to the technical field of valves, the three-way heat preservation stop valve special for asphalt comprises a valve body, three asphalt circulation channels and control channels are arranged in the valve body, the three asphalt circulation channels are communicated with one another, and the control channels correspond to the three asphalt circulation channels and are used for controlling the three asphalt circulation channels. According to the technical scheme provided by the utility model, the flowing direction of asphalt is controlled by arranging the valve rod, the valve rod is not easy to softly change, and the valve rod is provided with two sections of limiting parts in the control channels, so that the use requirement of the valve during asphalt production can be well met; a heat preservation jacket is designed outside the valve body, heat conduction oil is introduced into the heat preservation jacket to heat a medium in the valve body, the situation that the valve is stuck due to the fact that the medium in the valve body is solidified due to temperature reduction is avoided, the sealing face of the valve body is completely attached to the sealing face of the valve rod, it is guaranteed that no medium remains on the sealing face after the valve is closed, and the operation reliability of the valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a three-way thermal insulation cut-off valve special for asphalt. Background Art

[0002] Asphalt is a complex organic mixture composed of hydrocarbons of varying molecular weights and their non-metallic derivatives. It exhibits high viscosity, fluidity, and flexibility, becoming brittle at low temperatures. In the production process for high-softening-point asphalt, three-way plug valves are primarily used for diversion, with one channel connecting the normal production line and the other to the backup line. In the event of a production problem, one channel is closed and the other is opened, allowing the medium to flow entirely into the backup line. The multi-way valve design reduces and shortens piping, reducing the number of valves from two to one. It also eliminates the need for elbows, thereby minimizing the amount of medium remaining in the pipeline. Many manufacturers of asphalt-specific multi-way valves on the market use plug valves. The disadvantage of using three-way plug valves is that their sealing material is a PTFE-based product, which is not resistant to high temperatures. PTFE softens at high temperatures, causing the valve to leak, resulting in poor reliability. Utility Model Content

[0003] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a three-way thermal insulation cut-off valve specially designed for asphalt, which solves the problem that the sealing material of the existing valve will soften, leak easily and have poor reliability.

[0004] Technical Solution

[0005] In order to solve the above problems, the technical solution provided by the present invention is as follows:

[0006] A three-way thermal insulation shut-off valve dedicated to asphalt includes a valve body, wherein the valve body is provided with three asphalt circulation channels interconnected with each other, and control channels corresponding to the three asphalt circulation channels are provided for controlling the three asphalt circulation channels, and the three asphalt circulation channels are provided with control components with completely identical structures.

[0007] Furthermore, the control assembly includes a lower valve stem.

[0008] Furthermore, a valve stem sealing surface is provided on the lower valve stem, and valve body sealing surfaces corresponding to the valve body sealing surfaces are provided in the three control channels.

[0009] Furthermore, the three asphalt circulation channels are an asphalt inlet channel, a first asphalt outflow channel and a second asphalt outflow channel. The asphalt inlet channel is a vertical channel. The first asphalt outflow channel and the second asphalt outflow channel are located at the top of the asphalt inlet channel and are eccentrically arranged with respect to the asphalt inlet channel.

[0010] Furthermore, the three control channels are an asphalt inflow control channel, a first asphalt control channel, and a second asphalt control channel, and the asphalt inflow control channel, the first asphalt control channel, and the second asphalt control channel are respectively arranged corresponding to the asphalt inflow channel, the first asphalt outflow channel, and the second asphalt outflow channel.

[0011] Furthermore, the first asphalt control channel and the second asphalt control channel are communicated with the top of the asphalt inflow channel.

[0012] Furthermore, fillers are provided on the outside of the three control channels, and the outside of the control channels is inserted with a filler pressure cover.

[0013] Furthermore, each of the control channels faces a double-headed column on the outer end surface, the double-headed columns are symmetrically arranged, the double-headed column is fixed with a valve stem nut, an upper valve stem is rotated inside the valve stem nut, and the valve stem nut is threadedly matched with the upper valve stem.

[0014] Furthermore, an anti-rotation block is provided between the upper valve stem and the lower valve stem.

[0015] Furthermore, the three asphalt circulation channels in the valve body are surrounded by a heat transfer oil channel, and a jacket partitioning heat insulation partition is centrally provided in the heat transfer oil channel outside the asphalt inflow channel.

[0016] Beneficial effects

[0017] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0018] The technical solution provided by the utility model controls the flow direction of asphalt by setting a valve stem, and the valve stem is not easy to be replaced softly, and the valve stem is provided with two limit sections in the control channel, which can well meet the valve use requirements during asphalt production. An insulation jacket is designed outside the valve body, and heat transfer oil is introduced into the insulation jacket to heat the medium in the valve body to prevent the medium in the valve body from solidifying due to temperature drop and causing the valve to be stuck. The valve body sealing surface and the valve stem sealing surface are fully fitted to ensure that after the valve is closed, there is no medium residue at the sealing surface position, thereby improving the reliability of the valve operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a vertical cross-sectional view of the asphalt channel of Example 1 of the present utility model when fully closed;

[0020] Figure 2 This is a fully closed transverse cross-sectional view of the asphalt channel of Example 1 of the present utility model;

[0021] Figure 3 This is a vertical cross-sectional view of a fully opened asphalt channel of Example 1 of the present utility model;

[0022] Figure 4 This is a fully open transverse cross-sectional view of the asphalt channel of Example 1 of the utility model. DETAILED DESCRIPTION

[0023] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] Combined with attachment Figure 1-4 A three-way thermal insulation shut-off valve for asphalt, suitable for working conditions such as asphalt pipelines with a caliber range of ≤100mm, a pressure range of ≤5.0MPa, and a temperature of ≤400°C, includes a valve body 7, which is composed of three asphalt flow channels interconnected with each other, and control channels corresponding to the three asphalt flow channels for controlling the three asphalt flow channels. The three asphalt flow channels are an asphalt inflow channel 25 located on the lower side of the valve body, and a first asphalt outflow channel 21 and a second asphalt outflow channel 22 located at the left front side and the right rear side, respectively, at the top outlet height of the asphalt inflow channel 25.

[0026] The first asphalt outflow channel 21 is set on the left side of the top front side, and the second asphalt outflow channel 22 is set on the right side of the top front side. The eccentric setting of the first asphalt outflow channel 21 and the second asphalt outflow channel 22 relative to the asphalt inflow channel 25 can conveniently control the connection and isolation between the three channels, so that the first asphalt outflow channel 21 and the second asphalt outflow channel 22 can work independently.

[0027] The top of the asphalt inflow channel 25 in the valve body 7 is correspondingly set as an asphalt inflow control channel 35. The first asphalt outflow channel 21 located on the front side of the valve body 7 is provided with a first asphalt control channel 31 on the left side of the valve body. The second asphalt outflow channel 22 located on the rear side of the valve body 7 is provided with a second asphalt control channel 32 on the right side of the valve body 7. The inner ends of the asphalt inflow control channel 35, the first asphalt control channel 31, and the second asphalt control channel 32 are cross-arranged.

[0028] The asphalt inflow control channel 35 , the first asphalt control channel 31 , and the second asphalt control channel 32 are each provided with a control component for controlling the opening and closing of the asphalt inflow channel 25 , the first asphalt outflow channel 21 , and the second asphalt outflow channel 22 , respectively.

[0029] The control components in the asphalt inflow control channel 35 , the first asphalt control channel 31 , and the second asphalt control channel 32 are exactly the same.

[0030] The control assembly includes a lower valve stem 5 that slides in three control channels. Only the lower valve stem 5 is set in the three control channels to control the three asphalt flow channels. In the conventional technical solution, a valve flap is set on the valve stem to seal the three asphalt flow channels. This technical solution designs the valve stem and the valve flap as an integrated structure. The inner end of the lower valve stem 5 can be directly used as a valve flap. The lower valve stem 5 simultaneously plays the role of a valve flap and a valve stem.

[0031] The lower valve stem 5 can directly serve as an integrated structure of the valve stem and valve disc, thereby avoiding the dead angle that is easy to appear in the valve stem and valve disc connection structure, avoiding the residue of viscous asphalt medium, and preventing the valve from being abnormally stuck during use.

[0032] A welded sealing surface is provided on the lower valve stem 5, and a welded sealing surface is provided on the inner end of the lower valve stem 5 as a sealing part. The interior of the valve stem sealing part is designed to be a hollow structure, which not only reduces the overall weight of the lower valve stem 5, but also makes the valve stem sealing part elastic, the deformation of the valve stem sealing surface is greater, and the sealing effect is better.

[0033] Valve body sealing surfaces are provided at the ports facing the interior of the asphalt inflow channel 25, the first asphalt outflow channel 21 and the second asphalt outflow channel 22. The valve body sealing surfaces and the valve stem sealing surfaces are completely fitted together to ensure that no medium remains at the sealing surface position after the valve is closed, thereby improving the reliability of the valve operation. At the same time, the sealing structure of the valve body is placed on the lower valve stem 5, reducing the gap generated at the connection between the valve stem and the valve disc. The valve body sealing surface and the valve stem sealing surface are completely fitted together to ensure that no medium remains at the sealing surface position after the valve is closed, thereby improving the reliability of the valve operation.

[0034] When the asphalt in the first asphalt outflow channel 21 and the second asphalt outflow channel 22 flows, the asphalt flows from the asphalt inflow channel 25 into any control channel corresponding to the first asphalt outflow channel 21 and the second asphalt outflow channel 22, and then flows into any channel of the first asphalt outflow channel 21 and the second asphalt outflow channel 22.

[0035] When the asphalt flows, the top end of the asphalt inflow channel 25 is flush with the end faces of the flow channel outlets of the control flow channels of the first asphalt outflow channel 21 and the second asphalt outflow channel 22. Therefore, when the asphalt in the asphalt inflow channel 25 flows from bottom to top, it can directly enter the control channels of the first asphalt outflow channel 21 and the second asphalt outflow channel 22 in the open state, and further enter the first asphalt outflow channel 21 and the second asphalt outflow channel 22. When the first asphalt outflow channel 21 and the second asphalt outflow channel 22 are closed, the end faces of the lower valve stems 3 in the corresponding control channels are only flush with the inner end faces of the corresponding control channels. Therefore, when any one of the first asphalt outflow channel 21 and the second asphalt outflow channel 22 is closed, it will not affect the connection of the other with the asphalt inflow channel 25, and the asphalt flowing out of the asphalt inflow channel 25 cannot enter the closed asphalt control channel.

[0036] The lower valve stem 5 is located in the three control channels and the outer end gap is filled with 6. The three control channels are provided with a packing gland 9 for maintaining pressure 6. When the lower valve stem 3 is in the open state, the end face of the valve stem sealing surface of the lower valve stem 3 is flush with the packing, and the inner end face of the lower valve stem 3 is flush with the flow channel outlet of the asphalt channel, so that the flow channel space of the asphalt channel is exposed. When the lower valve stem 3 is in the closed state, the inner end face of the lower valve stem 3 is flush with the inner end face of the control channel, so that asphalt cannot enter the control channel of the closed asphalt channel at all.

[0037] A double-headed column 4 is provided on the end face of one end of each control channel facing outward, and the double-headed column 4 is symmetrically arranged. One end of the double-headed column 4 is installed on the end face of the control channel facing outward, and the other end is jointly fixed with a valve stem nut 2. An upper valve stem 3 is provided for rotation inside the valve stem nut 2, and the valve stem nut 2 is threadedly matched with the upper valve stem 3. By rotating the upper valve stem 3, since the valve stem nut 2 is fixed, the upper valve stem 3 can slide inside the valve stem nut 2 toward the inner and outer valve bodies.

[0038] The lower valve stem 5 is designed with a two-stage limit, which is respectively to set a limit at the port of the control channel for blocking the flow channel, and to make the end face of the lower valve stem 5 flush with the outer tangent of the flow channel outlet inside the control channel. When the asphalt inflow channel 25 is closed and the first asphalt outflow channel 21 and the second asphalt outflow channel 22 are opened, since the lower valve stem 5 is limited at the inner end of the asphalt inflow control channel 35, the medium cannot enter the valve cavity corresponding to the asphalt inflow channel 25, that is, it cannot enter the internal channel of the asphalt inflow control channel 35 corresponding to the asphalt inflow channel 25, thereby reducing the residue of viscous media such as asphalt.

[0039] When the first asphalt outflow channel 21 is opened, the inner end surface of the lower valve stem 5 is flush with the tangent line of the outer side of the flow channel outlet, preventing the asphalt medium from entering the valve body cavity and reducing the residue of the asphalt viscous medium.

[0040] The inner end of the upper valve stem 3 and the outer end of the lower valve stem 5 are both provided with an annular notch for limiting connection. An anti-rotation block 10 is fixed on the annular notches of the upper valve stem 3 and the lower valve stem 5, so that the upper valve stem 3 and the lower valve stem 5 can move synchronously through the limitation of the anti-rotation block 10. The upper valve stem 3 drives the lower valve stem 5 to slide toward the inner and outer valve bodies through the anti-rotation block 10, thereby realizing the control of the lower valve stem 5 on the connection and closure of the three asphalt flow channels.

[0041] The two-stage valve stem design allows the upper valve stem 3 to rotate while the lower valve stem 5 only moves without rotating. This reduces machining difficulty, reduces wear on the packing due to stem rotation, and increases the packing's service life.

[0042] A hand wheel 1 is fixedly provided at the outer end of the upper valve stem 3 , and a worker drives the upper valve stem 3 to rotate by turning the hand wheel 1 .

[0043] The valve body 7 is wrapped with a jacket 8, and the jacket 8 is provided on the valve body 7 for surrounding a heat transfer oil channel 40 outside the asphalt inflow channel 25 and the first asphalt outflow channel 21 and the second asphalt outflow channel 22.

[0044] The heat transfer oil channel 40 surrounds the asphalt inlet channel 25 and the first asphalt outflow channel 21 and the second asphalt outflow channel 22, and is used to fill and flow the heat transfer oil. After the heat transfer oil channel 40 is filled with the heat transfer oil, the asphalt inlet channel 25, the first asphalt outflow channel 21 and the second asphalt outflow channel 22 are heated so that when the asphalt flows in the asphalt inlet channel 25, the first asphalt outflow channel 21 and the second asphalt outflow channel 22, the asphalt will not solidify, thereby preventing the medium in the valve body from solidifying due to temperature drop and causing the valve to become stuck.

[0045] The heat transfer oil channel 40 on the valve body 7 surrounding the asphalt inflow channel 25 is provided with a jacket partition insulation partition 14 that divides the heat transfer oil channel 40 on the valve body 7 into two left and right zones based on the center position of the asphalt flow channel 25.

[0046] The thermal oil channel 40 wrapped around the three asphalt channels is provided with an outflow channel and an inflow channel for the circulation of thermal oil. The thermal oil channel 40 located outside the first asphalt outflow channel 21 and the second asphalt outflow channel 22 is connected to a thermal oil inflow channel, and the thermal oil channel 40 located outside the asphalt inflow channel 25 is connected to thermal oil outflow channels on both sides. The jacket partitioning insulation partition 14 divides the thermal oil channel 40 on the valve body 7 into two independent circulation channels. The thermal oil inflow channel of the thermal oil channel 40 located in the first asphalt outflow channel 21 and the thermal oil outflow channel of the thermal oil channel 40 outside the asphalt inflow channel 25 on the same side form a complete cycle, flowing in through the thermal oil inflow channel of the thermal oil channel 40 belonging to the first asphalt outflow channel 21, and flowing out through the thermal oil outflow channel of the thermal oil channel 40 outside the asphalt inflow channel 25 on the same side.

[0047] The thermal oil inlet channel of the thermal oil channel 40 of the second asphalt outflow channel 22 and the thermal oil outflow channel of the thermal oil channel 40 outside the asphalt inflow channel 25 on the same side form a complete cycle, flowing in through the thermal oil inlet channel of the thermal oil channel 40 belonging to the second asphalt outflow channel 22 and flowing out through the thermal oil outflow channel of the thermal oil channel 40 outside the asphalt inflow channel 25 on the same side.

[0048] By forming a circulation of the heat transfer oil, the heat transfer oil is maintained at a relatively high temperature, thereby keeping the valve body 7 at a relatively high temperature, so that the asphalt in the valve body will not solidify.

[0049] When designing the insulation jacket 8, a zoned insulation design is implemented, with left and right sections separated. This prevents the insulation medium from forming a dead zone within a large jacket area, which would reduce insulation efficiency and increase energy consumption. The jacket's zoned insulation baffles 14 between the first asphalt outlet channel 21 and the second asphalt outlet channel 22 improve insulation efficiency and prevent dead zones from forming over a large insulation area, which would otherwise affect the insulation effect.

[0050] The outer ends of the three asphalt channels are provided with valve body flanges 12, which are used for fixed connection with external equipment.

[0051] The heat transfer oil inlet channel and the heat transfer oil outlet channel of each asphalt channel are provided with a heat transfer oil flange 11, and the heat transfer oil flange 11 is used to connect the heat transfer oil supply equipment.

[0052] When the valve is opening, no medium remains in the upper cavity of the valve body, which prevents the viscous medium asphalt from agglomerating in the cavity and causing the valve to become abnormally stuck.

[0053] During normal use, the asphalt inflow channel 25 remains open, while the first and second asphalt outflow channels 21 and 22 are connected to different production lines. If a problem occurs on the production line of the asphalt outflow channel that serves as the normal production channel, it can be closed and the other asphalt outflow channel opened, allowing the production line to be switched at any time as needed. This improves production line efficiency and eliminates the need to shut down for maintenance. Switching production lines is accomplished by switching the channels of the valve.

[0054] Valve Body Assembly: Install the lower stem 3, packing 6, and packing gland 9 onto the valve body 7. Tighten the packing gland 9 with bolts and nuts. Install the stud 4 and stem nut 2, then the upper stem 3. Tighten the bolts and nuts, and install the handwheel 1. Repeat this assembly process twice. After all parts are assembled, a pressure test is performed, and the valve housing undergoes a strength test to ensure there are no external leaks. After passing the pressure test, the insulation jacket is installed. Once the jacket is assembled, another pressure test is performed to ensure the valve meets the required functionality.

[0055] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A three-way thermal insulation shut-off valve for asphalt, characterized in that: The valve body comprises three asphalt circulation channels which are interconnected, and control channels which are arranged corresponding to the three asphalt circulation channels and are used to control the three asphalt circulation channels. The three asphalt circulation channels are provided with control components with completely identical structures.

2. The asphalt-specific three-way thermal insulation shut-off valve according to claim 1, characterized in that: The control assembly includes a lower valve stem.

3. The asphalt-specific three-way thermal insulation shut-off valve according to claim 2, characterized in that: A valve stem sealing surface is provided on the lower valve stem, and valve body sealing surfaces corresponding to the valve body sealing surfaces are provided in the three control channels.

4. The asphalt-specific three-way thermal insulation shut-off valve according to claim 1, characterized in that: The three asphalt circulation channels are an asphalt inlet channel, a first asphalt outflow channel and a second asphalt outflow channel. The asphalt inlet channel is a vertical channel. The first asphalt outflow channel and the second asphalt outflow channel are located at the top of the asphalt inlet channel and are eccentrically arranged with respect to the asphalt inlet channel.

5. The asphalt-specific three-way thermal insulation shut-off valve according to claim 4, characterized in that: The three control channels are an asphalt inflow control channel, a first asphalt control channel, and a second asphalt control channel. The asphalt inflow control channel, the first asphalt control channel, and the second asphalt control channel are respectively arranged corresponding to the asphalt inflow channel, the first asphalt outflow channel, and the second asphalt outflow channel.

6. The asphalt-specific three-way thermal insulation shut-off valve according to claim 5, characterized in that: The first asphalt control channel and the second asphalt control channel are communicated with the top of the asphalt inflow channel.

7. The asphalt-specific three-way thermal insulation shut-off valve according to claim 1, characterized in that: Fillers are arranged on the outside of the three control channels, and the outside of the control channels are inserted with a filler gland.

8. The asphalt-specific three-way thermal insulation shut-off valve according to claim 2, characterized in that: Each of the control channels faces a double-headed column on the outer end surface, and the double-headed columns are symmetrically arranged. A valve stem nut is fixed to the double-headed column, and an upper valve stem is rotated inside the valve stem nut, and the valve stem nut is threadedly matched with the upper valve stem.

9. The asphalt-specific three-way thermal insulation shut-off valve according to claim 8, characterized in that: An anti-rotation block is provided between the upper valve stem and the lower valve stem.

10. The asphalt-specific three-way thermal insulation shut-off valve according to claim 4, characterized in that: The three asphalt circulation channels in the valve body are surrounded by a heat transfer oil channel, and a jacket partitioning heat insulation partition is centrally provided in the heat transfer oil channel outside the asphalt inflow channel.

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