High-pressure angle type regulating valve for urea

Abstract

The utility model belongs to the technical field of regulating valves, and discloses a high-pressure angle type regulating valve for urea. The device comprises a valve body, a dynamic guide mechanism is arranged in the valve body and comprises a valve seat arranged at the bottom of the side, close to a flow inlet channel, of an overflowing cavity, a valve cage is connected to the upper surface of the valve seat, and a plurality of throttling holes are evenly formed in the surface of the end, close to the valve seat, of the valve cage. A plurality of buffering ring chambers are further arranged in the end, close to the valve seat, of the valve cage, a stuffing box is arranged at the other end of the valve cage, a valve rod penetrates through the end, close to the stuffing box, of the interior of the valve cage, and a valve element head is connected to the end, close to the valve seat, of the valve rod. According to the valve cage, the buffer ring chamber is arranged to be matched with the throttling holes, stepped release of pressure in the valve cage can be achieved, damage to structures such as the valve cage and the valve rod caused by too large pressure difference at the overflowing cavity in the valve body is reduced, the turbulence effect is reduced, the problem of valve vibration under the high pressure difference is effectively solved, and therefore the vibration condition of the whole device is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of regulating valve, concretely is a high pressure angle type regulating valve for urea. BACKGROUND

[0002] The angle type regulating valve used in the urea device has the process production characteristics of high temperature, high pressure, high pressure difference, strong corrosion and the like severe working conditions. The highest pressure in the synthesis tower can reach 20MPa, the pressure decreases from 20MPa to about 2MPa in production, the pressure difference is as high as 18MPa, the temperature reaches above 180 DEG, the medium is roughly gas-liquid mixture of urea, aminomethylammonium, carbon dioxide, ammonia and the like, the chemical reaction is violent, the pressure fluctuation is large, and moreover is affected by the pressure of the material into the tower, the medium flow rate is high, and the fluctuation influence is large.

[0003] Since the existing angle type regulating valve used in the urea device is integrated with the valve body and the valve seat, the medium flow direction adopts bottom-in side-out, the inlet flow channel and the outlet flow channel are at right angles, and there is a large pressure difference between the inlet flow channel and the outlet flow channel, the fluid turns in the flow chamber, generates a lateral force on the valve rod, the bottom-in side-out flow direction leads to significant turbulent effect, the actual measurement data shows that the lateral force of the valve rod can reach 30-45% of the axial force, under this working condition, the valve rod is unevenly stressed, has large vibration and noise, is extremely easy to damage and even break, the valve core is abraded, the valve seat is eroded, and the service life of the whole regulating valve is short. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a high pressure angle type regulating valve for urea to solve the problems in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A high-pressure angle type regulating valve for urea comprises a valve body, an inlet channel arranged at the bottom of the valve body, an outlet channel arranged at one side of the valve body, a flow cavity arranged at the intersection of the inlet channel and the outlet channel, a dynamic guiding mechanism arranged inside the flow cavity, a valve seat arranged at the bottom of the flow cavity near the inlet channel, a valve cage connected to the upper surface of the valve seat, a plurality of throttling holes uniformly arranged on the surface of one end of the valve cage near the valve seat, a plurality of buffer ring chambers arranged inside the other end of the valve cage, a stuffing box arranged at the other end of the valve cage, a screw plug arranged at the top of the stuffing box, a valve rod arranged through one end of the valve cage near the stuffing box, a valve core head connected to the one end of the valve rod near the valve seat, the other end of the valve rod arranged through the valve body, a plurality of layers of stuffing and a plurality of layers of guiding sleeves arranged between the valve rod and the stuffing box and the screw plug, a pressing ring arranged outside the guiding sleeve near the top of the screw plug, and a gland connected to the outside of the pressing ring.

[0007] Further preferably, a lens is arranged at the connection between the inlet channel, the outlet channel and the valve body, and a flange is arranged at the side of the lens away from the valve body, and the flange is connected to the outside of the valve body through cooperation of a bolt and a nut.

[0008] Further preferably, an annular groove is arranged on the upper surface of the valve seat, and the lower end of the valve cage is arranged in the annular groove.

[0009] Further preferably, a valve rod is arranged through the inside of the pressing ring and the gland, and the pressing ring is connected to the top of the valve body through cooperation of a bolt and a nut.

[0010] Further preferably, the valve rod and the valve core head are fixedly connected through screwing.

[0011] Further preferably, the throttling holes are arranged in the length direction of the valve cage, and the throttling holes are in a long strip shape, and a plurality of protrusions are symmetrically arranged on the inner wall of the long strip-shaped throttling holes, and the four corners of the long strip-shaped throttling holes are in a round corner structure.

[0012] Further preferably, at least three layers of stuffing are filled between the adjacent guiding sleeves.

[0013] Further preferably, the buffer ring chambers are provided with at least three layers.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] By using a buffer ring chamber in conjunction with a throttling orifice, the valve cage can achieve a stepped release of internal pressure, reducing damage to the valve cage and valve stem caused by excessive pressure differential at the flow chamber inside the valve body. This also reduces turbulence and effectively reduces valve vibration under high pressure differential, thereby reducing the overall vibration of the high-pressure angle regulating valve for urea.

[0016] By integrating the stuffing box and valve cage into a single structure, the packing inside the stuffing box is deeply embedded within the valve body, eliminating the possibility of packing leakage. Furthermore, the packing is positioned between adjacent guide sleeves to further ensure that packing leakage does not occur.

[0017] The valve cage and valve seat are nested together by annular grooves, which increases the overall mechanical strength of the valve cage and reduces the risk of valve cage breakage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the dynamic guiding mechanism of this utility model;

[0020] Figure 3 This is an enlarged schematic diagram of the lens structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the valve cage structure of this utility model;

[0022] Figure 5 This utility model Figure 4 Schematic diagram of the cross-sectional structure along the AA direction;

[0023] In the diagram: 1. Valve body; 2. Bolt; 3. Nut; 4. Flange; 5. Lens; 6. Packing; 7. Plug; 8. Pressure ring; 9. Gland; 10. Valve stem; 11. Valve core head; 12. Valve cage; 13. Valve seat; 14. Throttling orifice; 15. Annular groove; 16. Stuffing box; 17. Buffer ring chamber; 18. Guide sleeve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution:

[0026] A high-pressure angle regulating valve for urea includes a valve body 1. An inlet channel is located at the bottom of the valve body 1, and an outlet channel is located on one side of the valve body 1. A flow passage is located at the junction of the inlet and outlet channels. A dynamic guiding mechanism is located inside the flow passage. The dynamic guiding mechanism includes a valve seat 13 located at the bottom of the flow passage near the inlet channel. A valve cage 12 is connected to the upper surface of the valve seat 13. Multiple throttling orifices 14 are evenly distributed on the surface of the valve cage 12 near the valve seat 13. Multiple buffers are also provided inside the end of the valve cage 12 near the valve seat 13. The annular chamber 17 and the valve cage 12 are provided with a stuffing box 16 at the other end. A screw plug 7 is provided on the top of the stuffing box 16. A valve stem 10 is provided through the valve cage 12 at one end near the stuffing box 16. A valve core head 11 is connected to one end of the valve stem 10 near the valve seat 13. The other end of the valve stem 10 is provided through the valve body 1. Multiple layers of packing 6 and multiple layers of guide sleeves 18 are also provided between the valve stem 10, the stuffing box 16 and the screw plug 7. A pressure ring 8 is provided on the outside of the guide sleeve 18 near the top of the screw plug 7. A pressure cap 9 is also connected to the outside of the pressure ring 8.

[0027] In this utility model, a lens 5 is provided at the connection between the inlet channel, the outlet channel and the valve body 1. A flange 4 is provided on the side of the lens 5 away from the valve body 1. The flange 4 is connected to the outside of the valve body 1 by bolts 2 and nuts 3 respectively.

[0028] In this invention, an annular groove 15 is provided on the upper surface of the valve seat 13, and the lower end of the valve cage 12 is nested within the annular groove 15. This increases the overall mechanical strength of the valve cage 12 and reduces the risk of the valve cage 12 breaking.

[0029] In this utility model, a valve stem 10 is provided through the inside of the pressure cap 9 and the pressure ring 8, and the pressure cap 9 is connected to the top of the valve body 1 by bolts 2 and nuts 3.

[0030] In this invention, the valve stem 10 and the valve core head 11 are fixedly connected by a screw connection. The valve core head 11 and the valve stem 10 are combined to form a solid structure.

[0031] In this utility model, the throttling orifice 14 is arranged along the length of the valve cage 12 and has a long strip-shaped structure. The inner wall of the long strip-shaped throttling orifice 14 is symmetrically provided with multiple protrusions, and the four corners of the long strip-shaped throttling orifice 14 are all rounded.

[0032] In this invention, at least three layers of filler 6 are filled between adjacent guide sleeves 18.

[0033] In this invention, the buffer ring chamber 17 is provided with at least 3 layers.

[0034] In this invention, the valve cage 12, valve stem 10, valve core head 11, and valve seat 13 are all made of Ferralium 255 steel, and their surfaces are all nitrided to a thickness of at least 0.15 mm and electropolished, thereby slowing down the corrosion of the gas-liquid two-phase fluid during long-term use and extending its service life.

[0035] Example: In use, the entire urea is first connected to the inlet and outlet pipes of the gas-liquid two-phase fluid via a high-pressure angle regulating valve through flange 4. By adjusting the height of valve stem 10, the gas-liquid two-phase fluid is ensured to enter the valve cage 12 after passing through the inlet channel and lens 5. After passing through the buffer ring chamber 17 inside the valve cage 12 for layer-by-layer pressure reduction, it flows into the flow passage cavity through the throttling hole 14 on the surface of the valve cage 12. Finally, it flows from the flow passage cavity through the lens 5 at the connection between the outlet channel and the valve body 1 into the outlet pipe connected to the outlet channel.

[0036] When adjusting the height of the valve stem 10, the multi-layered packing 6 and guide sleeve 18 guide the valve stem 10 left and right, reducing the eccentric load on the valve stem 10 and thus improving its service life. The valve stem 10 and valve core head 11 are fixedly connected by screws. The valve core head 11 and valve stem 10 are combined in a solid structure, reducing the risk of the valve core head 11 falling off due to long-term erosion, thereby improving the stability of fluid flow at the surface of the valve core head 11.

[0037] The throttling orifice 14 is set along the length of the valve cage 12 and has a long strip-shaped structure. The inner wall of the long strip-shaped throttling orifice 14 has multiple protrusions symmetrically arranged. The four corners of the long strip-shaped throttling orifice 14 are all rounded. Together with the three layers of buffer ring chambers 17 set on the inner wall of the valve cage 12, it can realize the step-by-step release of internal pressure. It avoids damage to the valve cage 12 and valve stem 10 and other structures caused by excessive pressure difference in the flow cavity inside the valve body 1. It reduces turbulence effect and effectively reduces valve vibration under high pressure difference, thereby reducing the vibration of the entire high-pressure angle regulating valve for urea.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-pressure angle regulating valve for urea, comprising a valve body (1), wherein an inlet channel is provided at the bottom of the valve body (1), an outlet channel is provided on one side of the valve body (1), and a flow cavity is provided at the junction of the inlet channel and the outlet channel, characterized in that: The flow passage is equipped with a dynamic guiding mechanism, which includes a valve seat (13) located at the bottom of the flow passage near the inlet channel. A valve cage (12) is connected to the upper surface of the valve seat (13). A plurality of throttling holes (14) are evenly arranged on the surface of the valve cage (12) near the valve seat (13). A plurality of buffer ring chambers (17) are also provided inside the end of the valve cage (12) near the valve seat (13). A stuffing box (16) is provided at the other end of the valve cage (12). A screw plug (7) is provided on the top of the stuffing box (16). A valve stem (10) is provided through one end of the valve cage (12) near the stuffing box (16). A valve core head (11) is connected to one end of the valve stem (10) near the valve seat (13). The other end of the valve stem (10) is provided through the valve body (1). Multiple layers of packing (6) and multiple layers of guide sleeves (18) are provided between the valve stem (10), the stuffing box (16), and the screw plug (7). A pressure ring (8) is provided on the outside of the guide sleeve (18) near the top of the screw plug (7). A pressure cap (9) is also connected to the outside of the pressure ring (8).

2. The high-pressure angle regulating valve for urea according to claim 1, characterized in that: Lenses (5) are provided at the connection points of the inlet channel, the outlet channel, and the valve body (1). Flanges (4) are provided on the side of the lens (5) away from the valve body (1). The flanges (4) are connected to the outside of the valve body (1) by bolts (2) and nuts (3).

3. The high-pressure angle regulating valve for urea according to claim 1, characterized in that: The valve seat (13) has an annular groove (15) on its upper surface, and the lower end of the valve cage (12) is nested with the annular groove (15).

4. The high-pressure angle regulating valve for urea according to claim 1, characterized in that: A valve stem (10) is provided through the inside of the pressure cap (9) and the pressure ring (8). The pressure cap (9) is connected to the top of the valve body (1) by bolts (2) and nuts (3).

5. A high-pressure angle regulating valve for urea according to claim 1, characterized in that: The valve stem (10) and the valve core head (11) are fixedly connected by screws.

6. The high-pressure angle regulating valve for urea according to claim 1, characterized in that: The throttling orifice (14) is arranged along the length of the valve cage (12) and has a long strip-shaped structure. The inner wall of the long strip-shaped throttling orifice (14) is symmetrically provided with multiple protrusions, and the four corners of the long strip-shaped throttling orifice (14) are all rounded.

7. A high-pressure angle regulating valve for urea according to claim 1, characterized in that: At least three layers of filler (6) are filled between adjacent guide sleeves (18).

8. A high-pressure angle regulating valve for urea according to claim 1, characterized in that: The buffer ring chamber (17) has at least 3 layers.

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