CN217422355U - Three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam - Google Patents
Three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam Download PDFInfo
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- CN217422355U CN217422355U CN202220237104.4U CN202220237104U CN217422355U CN 217422355 U CN217422355 U CN 217422355U CN 202220237104 U CN202220237104 U CN 202220237104U CN 217422355 U CN217422355 U CN 217422355U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The scheme discloses a three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam, wherein the three-way valve comprises a high-pressure feeding pipe, a low-pressure feeding pipe and a discharging pipe, and the high-pressure feeding pipe and the discharging pipe are coaxial; the axial direction of the low-pressure feeding pipe is vertical to the axial direction of the high-pressure feeding pipe; the motion terminal position of the valve core corresponds to the downstream end opening position of the low-pressure feeding pipe, and the cross section shape of the valve core is matched with the shape of the downstream end opening of the low-pressure feeding pipe; a porous pressure reducer is fixed in the downstream end of the high-pressure feed pipe, is in a cylindrical shape which is communicated up and down, and has two ends which are abutted against two sides of the pipe wall of the downstream end of the high-pressure feed pipe and are axially parallel to the axial direction of the low-pressure feed pipe; the low-pressure feed pipe end opening of the porous pressure reducer includes the downstream end opening of the low-pressure feed pipe; the side wall of the porous pressure reducer is provided with a plurality of pressure reducing holes in a penetrating way. The beneficial effects are that: effectively reduces the pressure of a high-pressure medium, can smoothly mix high-pressure caprolactam and low-pressure caprolactam to form proper pressure meeting the standard, and eliminates the cavitation phenomenon.
Description
Technical Field
The utility model relates to a polyester production field specifically is a high low pressure caprolactam mixes uses three-way valve.
Background
At present, the polyamide chips produced in chemical fiber textile industry at home and abroad usually adopt a polymerization process, and a caprolactam solution is used in the polymerization process. In order to save energy and protect environment, the caprolactam solution used in the polymerization process is recycled after the processes of rectification, evaporation, oligomer separation and the like, and is added into the polymerization process again for polymerization reaction, so that the cyclic use is realized. Since the purity of the recovered caprolactam solution is not as high as that of the fresh solution, impurities which affect the product quality are carried in the recovered caprolactam solution, and the viscosity of the recovered caprolactam solution is much higher than that of the fresh caprolactam solution, the temperature and the pressure of the recovered caprolactam solution passing through the pre-reactor are relatively high, so that it is difficult to mix the fresh low-viscosity and low-pressure caprolactam solution and the recovered high-temperature and high-pressure caprolactam solution together to enter the pre-reactor in a low-pressure manner. Chinese patent document CN209229096U discloses "a valve rod driving device for a high-temperature regulating valve" in 2019, 8.9.8.9, which includes a valve cover connected with a valve body through a bolt, the valve cover is integrally in a vertical cylindrical structure, the upper end of the valve cover is connected with a pneumatic actuator through a connecting seat, and a connecting rod inside the pneumatic actuator is fixedly connected with the upper end of a driving rod through a coupling; the driving rod penetrates through the central through hole of the valve cover; the method is characterized in that: a circular first groove is embedded in the upper end face of the valve cover in a downward mode, and the bottom face of the first groove is communicated with a central through hole of the valve cover to form a stepped hole structure; a first heat-resistant filling piece is arranged in an annular gap formed between the driving rod and the first groove, and a second heat-resistant filling piece is arranged below the first heat-resistant filling piece. The high-temperature regulating valve is simple to operate, convenient to use and suitable for various types of high-temperature regulating valves. Although the mixing of caprolactam of high pressure and low pressure can be realized by using the three-way converging valve with the structure, the cavitation phenomenon generated by changing the high pressure medium and the low pressure medium into low pressure after converging is still difficult to avoid.
Disclosure of Invention
In order to solve the problem, the utility model provides a high-low pressure caprolactam mixes uses three-way valve has effectively reduced the pressure of high-pressure medium, can make high, low pressure caprolactam mix smoothly, forms the suitable pressure that satisfies the standard, eliminates the cavitation phenomenon.
In order to realize the purpose of the invention, the utility model adopts the following technical scheme: a three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam comprises a pneumatic film mechanism, an actuating mechanism and a three-way pipe, wherein the actuating mechanism comprises a movable valve core, the three-way pipe comprises a high-pressure feeding pipe, a low-pressure feeding pipe and a discharging pipe,
the high-pressure feed pipe and the discharge pipe are coaxial;
the axial direction of the low-pressure feeding pipe is vertical to the axial direction of the high-pressure feeding pipe;
the motion terminal position of the valve core corresponds to the downstream end opening position of the low-pressure feeding pipe, and the cross section shape of the valve core is matched with the shape of the downstream end opening of the low-pressure feeding pipe;
a porous pressure reducer is fixed in the downstream end of the high-pressure feed pipe, is in a cylindrical shape which is communicated up and down, and has two ends which are abutted against two sides of the pipe wall of the downstream end of the high-pressure feed pipe and are axially parallel to the axial direction of the low-pressure feed pipe; the low-pressure feed pipe end opening of the porous pressure reducer includes the downstream end opening of the low-pressure feed pipe; the side wall of the porous pressure reducer is provided with a plurality of pressure reducing holes in a penetrating way.
Preferably, the porous pressure reducer is cylindrical and the axis of the porous pressure reducer coincides with the axis of the low-pressure feed pipe.
Preferably, the ratio of the pipe diameter of the downstream end of the high-pressure feeding pipe to the diameter of the porous pressure reducer is 0.8-0.85.
Preferably, the ratio of the pipe diameter of the downstream end of the high-pressure feeding pipe to the aperture of the pressure reducing holes is 6.3-6.5, and the number of the pressure reducing holes is 35-40.
Preferably, the pressure-reducing holes are regularly arranged in a rectangular array on the side wall of the porous pressure-reducer.
Preferably, the high-pressure feed pipe is flared with a small upstream end and a large downstream end.
Preferably, the low-pressure feed pipe is in the shape of an inverted trumpet with a large upstream end and a small downstream end.
Preferably, the three-way pipe is wrapped with a heat preservation sleeve, and the heat preservation sleeve is filled with constant temperature fluid.
The three-way valve for mixing the high-pressure caprolactam and the low-pressure caprolactam is provided with main components such as a pneumatic film mechanism, an actuating mechanism, a three-way pipe and the like. The three directions of the three-way pipe are respectively a high-pressure feeding pipe, a low-pressure feeding pipe and a discharging pipe. The recovered high-temperature and high-pressure caprolactam solution flows in from a high-pressure feeding pipe, the fresh normal-temperature and normal-pressure caprolactam solution flows in from a low-pressure feeding pipe, and the caprolactam solution is mixed and then led out from a discharging pipe. The high-pressure feeding pipe and the discharging pipe are designed to be coaxial, and the axial direction of the low-pressure feeding pipe is perpendicular to that of the high-pressure feeding pipe, so that the whole three-way pipe is T-shaped. The actuating mechanism is driven by a pneumatic film mechanism, necessary components such as a valve core and the like are designed, the valve core can be driven by external power to move, and the position, the shape and the size of the valve core are matched with the opening at the downstream end of the low-pressure feeding pipe, so that the opening can be blocked or the opening of the opening can be slightly adjusted when the valve core moves to the opening at the downstream end of the low-pressure feeding pipe, so as to adjust the on-off or flow rate of fresh normal-temperature and normal-pressure caprolactam solution. A porous pressure reducer is additionally arranged at the communication position of the three-way pipe, namely the downstream end of the high-pressure feed pipe. The porous pressure reducer is a cylindrical structural member which is communicated up and down and is made of rigid material, and a plurality of pressure reducing holes are communicated on the cylinder wall. The porous pressure reducer is preferably cylindrical, axially coincident with the axial direction of the low-pressure feed pipe, and is fixedly mounted on the downstream end of the high-pressure feed pipe, and an opening of the porous pressure reducer near the end of the low-pressure feed pipe includes the opening of the downstream end of the low-pressure feed pipe. If the valve core moves along the axial direction of the low-pressure feeding pipe, the valve core rod can be axially arranged in the porous pressure reducer in a penetrating way, one end of the valve core rod is connected with the actuating mechanism, and the other end of the valve core rod can drive the valve core to move along the axial direction of the low-pressure feeding pipe.
In the design, the low-pressure caprolactam solution flowing in from the low-pressure feeding pipe is firstly released into the space inside the porous pressure reducer, while the high-pressure lactam solution flowing in from the high-pressure feeding pipe is firstly released into the space outside the porous pressure reducer, and can enter the porous pressure reducer through the speed reduction and pressure reduction effects of the pressure reduction holes, so that the low-pressure caprolactam solution and the high-pressure lactam solution can be mixed. The design parameters of the porous pressure reducer in this design are therefore critical. According to the parameters of temperature, pressure and the like of the caprolactam solution recovered in the actual production, the inventor recommends after passing a plurality of tests that: the ratio of the pipe diameter of the downstream end of the high-pressure feeding pipe to the diameter of the porous pressure reducer is 0.8-0.85, the ratio of the pipe diameter of the downstream end of the high-pressure feeding pipe to the aperture of the pressure reducing holes is 6.3-6.5, the number of the pressure reducing holes is 35-40, and the pressure reducing holes are regularly arranged in a rectangular array on the side wall of the porous pressure reducer.
Further, the shapes of the high-pressure feed pipe and the low-pressure feed pipe can be beneficially improved: the high-pressure feeding pipe is in a horn shape with a small upstream end and a large downstream end, and the high-pressure caprolactam solution can release pressure after entering a large space; the low-pressure feeding pipe is in an inverted trumpet shape with a large upstream end and a small downstream end, and the pressure of the low-pressure caprolactam solution can be increased after the low-pressure caprolactam solution enters a small space. The two can carry out pressure preconditioning through the pipeline, has reduced the pressure difference, has improved the mixed effect, has reduced the emergence probability of cavitation phenomenon.
Furthermore, a heat-insulating sleeve is coated outside the three-way pipe, and constant-temperature fluid, such as circulating water, is filled in the heat-insulating sleeve to adjust the temperature of the high-pressure caprolactam solution and the low-pressure caprolactam solution, so that the temperature difference between the high-pressure caprolactam solution and the low-pressure caprolactam solution before mixing is further reduced, and the temperature after mixing is more suitable for the reaction requirement.
To sum up, the beneficial effects of the utility model are that: effectively reduces the pressure of a high-pressure medium, can smoothly mix high-pressure caprolactam and low-pressure caprolactam to form proper pressure meeting the standard, and eliminates the cavitation phenomenon.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: the device comprises a pneumatic film mechanism 1, an execution mechanism 2, a valve core 21, a valve core rod 22, a high-pressure feeding pipe 3, a low-pressure feeding pipe 4, a discharging pipe 5, a porous pressure reducer 6, pressure reducing holes 61 and a heat preservation sleeve 7.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Examples
The embodiment is a three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam, which is applied to a certain polyester synthesis production line.
Referring to fig. 1, the present embodiment includes three main components: the pneumatic film mechanism 1 at the upper part, the actuating mechanism 2 at the middle part and the three-way pipe at the lower part. The three-way pipe is T-shaped and comprises a high-pressure feeding pipe 3, a low-pressure feeding pipe 4 and a discharging pipe 5, wherein the high-pressure feeding pipe 3 is arranged on the right side, the discharging pipe 5 is arranged on the left side, and the high-pressure feeding pipe 3, the low-pressure feeding pipe and the discharging pipe are coaxial; the low-pressure feed pipe 4 is arranged at the lower part, and the axial direction of the low-pressure feed pipe is vertical to the axial direction of the high-pressure feed pipe 3. The flow direction of the fluid is: the recovered high-temperature high-pressure caprolactam solution flows from right to left along the high-pressure feeding pipe 3, as shown in the direction A; the fresh normal-temperature low-pressure caprolactam solution flows along the low-pressure feeding pipe 4 from bottom to top, as shown in the figure C; the mixed liquid mixed in the three-way pipe flows from right to left along the discharge pipe 5 as shown in the diagram B.
A porous pressure reducer 6 is fixed inside the downstream end of the high-pressure feed pipe 3. The porous pressure reducer 6 of this embodiment is made of a high-temperature-resistant, corrosion-resistant stainless steel material, and has a cylindrical shape that penetrates vertically, and a plurality of pressure reducing holes 61 are provided in the cylindrical wall. The axial direction of the porous pressure reducer 6 coincides with the axial direction of the low-pressure feed pipe 4, and the lower end diameter of the porous pressure reducer 6 is slightly larger than the opening at the upper end, i.e., the downstream end, of the low-pressure feed pipe 4.
The ratio of the pipe diameter of the downstream end of the high-pressure feeding pipe 3 to the diameter of the porous pressure reducer 6 is 0.8-0.85, in this case 0.83; the ratio of the pipe diameter of the downstream end of the high-pressure feeding pipe 3 to the aperture of the pressure reducing hole 61 is 6.3-6.5, in this case 6.35; the number of the decompression holes 61 is 35-40, in this example 36; the pressure-reducing holes 61 are regularly arranged in a rectangular array on the side wall of the porous pressure-reducer 6.
The actuator 2 includes a spool rod 22 and a spool 21. The valve core rod 22 is arranged in the porous pressure reducer 6 in a penetrating way, the upper part of the valve core rod is connected with the execution mechanism 22, the lower part of the valve core rod is connected with the valve core 21, and the valve core 21 can be driven to move up and down by the pneumatic membrane mechanism 1. The shape, size and position of the spool 21 are adapted to the upper end opening of the low pressure feed pipe 4. When the valve core 21 moves to the lowest end, the opening at the upper end of the low-pressure feeding pipe 4 can be blocked.
The high-pressure feeding pipe 3 is in a horn shape with a small upstream side and a large downstream side, so that pressure reduction is facilitated; the low-pressure feeding pipe 4 adopts a trumpet shape with a large upstream side and a small downstream side to facilitate pressurization. The discharge pipe 5 has the same downstream end caliber as the high-pressure feed pipe 3.
And a heat insulation sleeve 7 is further arranged outside the three-way pipe, the heat insulation sleeve 7 is a sealed jacket, circulating water is filled inside the heat insulation sleeve 7 and can be circulated and circulated, and the heat insulation sleeve is used for pre-adjusting the temperature of fluid in the high-pressure feeding pipe 3, the low-pressure feeding pipe 4 and the discharging pipe 5 so as to reduce the temperature difference.
The rest parts comprise springs, films, couplers, valve covers, packing assemblies, packing covers and the like, which are all arranged conventionally, and are not described in detail herein.
Claims (8)
1. A three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam comprises a pneumatic film mechanism (1), an actuating mechanism (2) and a three-way pipe, wherein the actuating mechanism (2) comprises a movable valve core (21), the three-way pipe comprises a high-pressure feeding pipe (3), a low-pressure feeding pipe (4) and a discharging pipe (5), and is characterized in that,
the high-pressure feeding pipe (3) and the discharging pipe (5) are coaxial;
the axial direction of the low-pressure feeding pipe (4) is vertical to the axial direction of the high-pressure feeding pipe (3);
the motion terminal position of the valve core (21) corresponds to the downstream end opening position of the low-pressure feeding pipe (4), and the cross section shape of the valve core (21) is matched with the shape of the downstream end opening of the low-pressure feeding pipe (4);
a porous pressure reducer (6) is fixed in the downstream end of the high-pressure feeding pipe (3), the porous pressure reducer (6) is in a cylindrical shape which is communicated up and down, two ends of the porous pressure reducer are abutted against two sides of the pipe wall of the downstream end of the high-pressure feeding pipe (3), and the axial direction of the porous pressure reducer is parallel to the axial direction of the low-pressure feeding pipe (4); the low-pressure feed pipe end opening of the porous pressure reducer (6) includes the downstream end opening of the low-pressure feed pipe (4); the side wall of the porous pressure reducer (6) is provided with a plurality of pressure reducing holes (61) in a penetrating way.
2. A three-way valve for mixing high and low pressure caprolactam according to claim 1, characterized in that the porous pressure reducer (6) has a cylindrical shape and the axis of the porous pressure reducer (6) coincides with the axis of the low pressure feed pipe (4).
3. The three-way valve for mixing high and low pressure caprolactam according to claim 2, wherein the ratio of the pipe diameter of the downstream end of the high pressure feeding pipe (3) to the diameter of the porous pressure reducer (6) is 0.8 to 0.85.
4. The three-way valve for mixing high and low pressure caprolactam according to claim 1 or 2, wherein the ratio of the pipe diameter of the downstream end of the high pressure feeding pipe (3) to the diameter of the pressure reducing holes (61) is 6.3 to 6.5, and the number of the pressure reducing holes (61) is 35 to 40.
5. A three-way valve for mixing high and low pressure caprolactam according to claim 1 or 2, wherein the pressure reducing holes (61) are arranged in a regular rectangular array on the side wall of the porous pressure reducer (6).
6. A three-way valve for mixing high and low pressure caprolactam according to claim 1 or 2, characterized in that the high pressure feeding pipe (3) is flared with a small upstream end and a large downstream end.
7. A three-way valve for mixing high and low pressure caprolactam according to claim 1 or 2, characterized in that the low pressure feed pipe (4) is in the shape of an inverted trumpet with a large upstream end and a small downstream end.
8. The three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam as claimed in claim 1 or 2, which is characterized in that the three-way valve is coated with a heat-insulating sleeve (7), and the heat-insulating sleeve (7) is filled with a constant-temperature fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220237104.4U CN217422355U (en) | 2022-01-28 | 2022-01-28 | Three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220237104.4U CN217422355U (en) | 2022-01-28 | 2022-01-28 | Three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam |
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| Publication Number | Publication Date |
|---|---|
| CN217422355U true CN217422355U (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220237104.4U Active CN217422355U (en) | 2022-01-28 | 2022-01-28 | Three-way valve for mixing high-pressure caprolactam and low-pressure caprolactam |
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| CN (1) | CN217422355U (en) |
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- 2022-01-28 CN CN202220237104.4U patent/CN217422355U/en active Active
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