Special three-way heat preservation stop valve for asphalt

Abstract

The invention 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 the 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, the flowing direction of asphalt is controlled by arranging the valve rod, the valve rod is not prone to soft change, the valve rod is provided with two limiting sections in the control channels, the valve use requirement during asphalt production can be well met, the heat preservation jacket is designed outside the valve body, the heat preservation jacket is arranged outside the valve body, and therefore the heat preservation effect is good. 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 invention relates to the technical field of valves, and in particular to a three-way thermal insulation cut-off valve dedicated to asphalt. Background Art

[0002] Asphalt is a complex organic mixture composed of hydrocarbons of different molecular weights and their non-metallic derivatives. It has high viscosity, fluidity and flexibility, and becomes brittle at low temperatures. In the production process of high softening point asphalt, three-way plug valves are mainly used for diversion. One channel connects the normal production line and the other channel connects the spare production line. When there is a problem in production, one end of the channel is closed and the other end of the channel is opened, and all the media enter the spare production line channel. The design of the multi-way valve reduces the pipeline and shortens the pipeline, from 2 valves to 1 valve, while reducing the use of elbows, thereby reducing the residual medium in the pipeline. Many manufacturers of multi-way valves for asphalt on the market use plug valves. The disadvantage of using three-way plug valves is that the sealing material of the plug valve is a PTFE product, which is not resistant to high temperatures. At high temperatures, PTFE products will soften, causing the valve to leak. The reliability is poor. Summary of the invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention 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] To solve the above problems, the technical solution provided by the present invention is:

[0006] A three-way thermal insulation shut-off valve dedicated to asphalt includes a valve body, wherein three asphalt circulation channels are arranged in the valve body and are interconnected, and control channels 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. The three asphalt circulation channels in the valve body are surrounded by heat transfer oil channels, and the control component includes a lower valve stem.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] Furthermore, the first asphalt control channel and the second asphalt control channel are communicated with the top of the asphalt inflow channel.

[0011] Furthermore, fillers are arranged inside the outer sides of the three control passages, and a cover covered by the fillers is inserted into the outer sides of the control passages.

[0012] Furthermore, each of the control channels has 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 rotatably arranged inside the valve stem nut, and the valve stem nut is threadably matched with the upper valve stem.

[0013] Furthermore, an anti-rotation block is provided between the upper valve stem and the lower valve stem.

[0014] Furthermore, a jacket partitioning heat-insulating baffle is centrally provided in the heat-conducting oil channel outside the asphalt inflow channel.

[0015] Beneficial Effects

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] The technical solution provided by the present invention 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 positions 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 reduction and causing the valve to be stuck. The valve body sealing surface and the valve stem sealing surface are completely 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

[0018] Figure 1 This is a fully closed vertical cross-sectional view of the asphalt channel of Example 1 of the present invention;

[0019] Figure 2 This is a fully closed transverse cross-sectional view of the asphalt channel of Example 1 of the present invention;

[0020] Figure 3 This is a vertical cross-sectional view of a fully opened asphalt channel of Example 1 of the present invention;

[0021] Figure 4 This is a fully open transverse cross-sectional view of the asphalt channel of Example 1 of the present invention. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1

[0024] Combined with Figure 1-4 A three-way thermal insulation cut-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℃, including a valve body 7, which is composed of three asphalt flow channels connected to 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 at 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 at the top outlet height of the asphalt inflow channel 25, respectively.

[0025] The first asphalt outflow channel 21 is arranged on the left side of the top front side, and the second asphalt outflow channel 22 is arranged on the right side of the top front side. The eccentric arrangement 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 connectivity and isolation between the three channels, so that the first asphalt outflow channel 21 and the second asphalt outflow channel 22 can work independently.

[0026] The top of the asphalt inlet channel 25 in the valve body 7 is correspondingly set as an asphalt inlet 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, and 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, and the inner ends of the asphalt inlet control channel 35, the first asphalt control channel 31, and the second asphalt control channel 32 are cross-arranged.

[0027] The asphalt inflow control channel 35 , the first asphalt control channel 31 , and the second asphalt control channel 32 are all provided with control components 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.

[0028] 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.

[0029] The control assembly includes a lower valve stem 5 sliding in three control channels. Only the lower valve stem 5 is arranged in the three control channels to control the three asphalt flow channels. In the conventional technical solution, a valve flap is arranged on the valve stem to seal the three asphalt flow channels. In the present technical solution, the valve stem and the valve flap are designed 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 plays the role of both the valve flap and the valve stem.

[0030] The lower valve stem 5 can directly serve as an integrated structure of the valve stem and the 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.

[0031] 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 larger, and the sealing effect is better.

[0032] Valve body sealing surfaces are provided at the ports facing the interior of the asphalt inlet channel 25, the first asphalt outflow channel 21 and the second asphalt outflow channel 22. 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 after the valve is closed, thereby improving the reliability of valve operation. At the same time, the sealing structure of the valve body is placed on the lower valve stem 5 to reduce 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 after the valve is closed, thereby improving the reliability of valve operation.

[0033] 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.

[0034] When the asphalt flows, the top of the asphalt inflow channel 25 is located 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 one with the asphalt inflow channel 25, and the asphalt flowing out of the asphalt inflow channel 25 cannot enter the closed asphalt control channel.

[0035] The gap at the outer end of the lower valve stem 5 located in the three control channels is filled with 6, and a packing gland 9 for pressure-maintaining packing 6 is provided on the outer side of the three control channels. When the lower valve stem 3 is in an 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 a 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.

[0036] 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 fixed with a valve stem nut 2. An upper valve stem 3 is rotatably arranged 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 fixedly arranged, the upper valve stem 3 can slide inside the valve stem nut 2 toward the direction of the inner and outer valve bodies.

[0037] The lower valve stem 5 is designed with a two-stage limiter, which is respectively to set a limiter 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 inlet 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.

[0038] 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, thereby preventing the asphalt medium from entering the valve body cavity and reducing the residue of the asphalt viscous medium.

[0039] 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, and an anti-rotation block 10 is fixedly provided 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 limiting of the anti-rotation block 10. The upper valve stem 3 drives the lower valve stem 5 to slide in the direction of 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.

[0040] The two-stage valve stem structure design is adopted, the upper valve stem 3 rotates and moves, and the lower valve stem 5 only moves and does not rotate. The two-stage valve stem reduces the processing difficulty, reduces the wear of the packing due to the rotation of the valve stem, and increases the service life of the packing.

[0041] 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 .

[0042] The valve body 7 is wrapped with a jacket 8, and the valve body 7 is provided with the jacket 8 for surrounding and setting 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.

[0043] 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 valve from getting stuck due to the solidification of the medium in the valve body caused by the temperature drop.

[0044] 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 which 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 .

[0045] The heat transfer oil channel 40 wrapped outside the three asphalt channels is provided with an outflow channel and an inflow channel for the circulation of heat transfer oil. The heat transfer oil channel 40 outside the first asphalt outflow channel 21 and the second asphalt outflow channel 22 is connected with a heat transfer oil inflow channel, and the heat transfer oil channel 40 outside the asphalt inflow channel 25 is connected with heat transfer oil outflow channels on both sides. The jacket partition insulation baffle 14 divides the heat transfer oil channel 40 on the valve body 7 into two independent circulation channels. The heat transfer oil inflow channel of the heat transfer oil channel 40 located in the first asphalt outflow channel 21 and the heat transfer oil outflow channel of the heat transfer oil channel 40 outside the asphalt inflow channel 25 on the same side form a complete cycle, and the heat transfer oil flows in through the heat transfer oil inflow channel of the heat transfer oil channel 40 belonging to the first asphalt outflow channel 21, and flows out through the heat transfer oil outflow channel of the heat transfer oil channel 40 outside the asphalt inflow channel 25 on the same side.

[0046] The heat transfer oil inlet channel of the heat transfer oil channel 40 of the second asphalt outflow channel 22 and the heat transfer oil outflow channel of the heat transfer oil channel 40 outside the asphalt inflow channel 25 on the same side form a complete cycle, flowing in through the heat transfer oil inlet channel of the heat transfer oil channel 40 belonging to the second asphalt outflow channel 22, and flowing out through the heat transfer oil outflow channel of the heat transfer oil channel 40 outside the asphalt inflow channel 25 on the same side.

[0047] By forming a circulation of the heat transfer oil, the heat transfer oil is maintained at a relatively high temperature, so that the valve body 7 is maintained at a relatively high temperature, so that the asphalt in the valve body will not solidify.

[0048] When designing the insulation jacket 8, a partitioned insulation design is performed, with the left and right separated to prevent the insulation medium from forming a dead zone in the large jacket area, resulting in reduced insulation efficiency and increased energy consumption. The jacket partition insulation baffle 14 between the first asphalt outflow channel 21 and the second asphalt outflow channel 22 can improve the insulation efficiency and avoid a large insulation area, forming a dead zone, and affecting the insulation effect.

[0049] The outer ends of the three asphalt channels are provided with valve body flanges 12, and the valve body flanges 12 are used for fixed connection with external equipment.

[0050] 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.

[0051] When the valve is opened, 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.

[0052] During normal use, the asphalt inflow channel 25 remains open, and the first asphalt outflow channel 21 and the second asphalt outflow channel 22 are connected to different production lines respectively; when the production line of the asphalt outflow channel as the normal production channel has a problem, it can be closed and the other asphalt outflow channel can be opened, and the production line can be switched at any time as needed, and the production line is highly efficient and does not need to be stopped for maintenance. The production line can be switched by switching the channel of the valve.

[0053] Valve body assembly: Install the lower valve stem 3, packing 6, packing gland 9 on the valve body 7, and tighten the packing gland 9 with bolts and nuts; install the double-headed column 4 and the valve stem nut 2, the upper valve stem 3, tighten the bolts and nuts, and install the handwheel 1; repeat the above assembly process twice. After the parts are assembled, perform a pressure test, and the valve performs a shell strength test to ensure that there is no external leakage point in the valve shell. After the pressure test is qualified, install the insulation jacket, and after the insulation jacket is assembled, perform a pressure test again. Ensure that the function of the valve meets the use requirements.

[0054] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A three-way thermal insulation cut-off valve for asphalt, characterized in that: It includes a valve body, wherein three asphalt circulation channels are arranged in the valve body and are interconnected, and control channels are arranged corresponding to the three asphalt circulation channels for controlling the three asphalt circulation channels. The three asphalt circulation channels are provided with control components with completely identical structures. The three asphalt circulation channels in the valve body are surrounded by heat transfer oil channels, and the control component includes a lower valve stem.

2. The three-way thermal insulation cut-off valve for asphalt according to claim 1 is characterized in that: The lower valve stem is provided with a valve stem sealing surface, and the three control channels are provided with valve body sealing surfaces corresponding to the valve body sealing surfaces.

3. The three-way thermal insulation cut-off valve for asphalt according to claim 1 is characterized in that: The three asphalt circulation channels are an asphalt inlet channel, a first asphalt outlet channel and a second asphalt outlet 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.

4. The three-way thermal insulation cut-off valve for asphalt according to claim 3 is 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.

5. The three-way thermal insulation cut-off valve for asphalt according to claim 4 is characterized in that: The first asphalt control channel and the second asphalt control channel are communicated with the top of the asphalt inflow channel.

6. The three-way thermal insulation cut-off valve for asphalt according to claim 1 is characterized in that: The outer sides of the three control passages are provided with fillers, and the outer sides of the control passages are inserted with a filler gland.

7. The three-way thermal insulation cut-off valve for asphalt according to claim 1 is 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 rotatably arranged inside the valve stem nut, and the valve stem nut is matched with the upper valve stem thread.

8. The three-way thermal insulation cut-off valve for asphalt according to claim 7 is characterized in that: An anti-rotation block is provided between the upper valve stem and the lower valve stem.

9. The three-way thermal insulation cut-off valve for asphalt according to claim 3 is characterized in that: A jacket partitioning heat-insulating partition is centrally arranged in the heat-conducting oil channel outside the asphalt inflow channel.

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