A solid carbon dioxide liquid feed throttling device

Abstract

The utility model discloses a solid carbon dioxide liquid inlet throttling device relates to dry ice manufacturing technical field, including throttle valve main part, damping component no.

Description

Technical Field

[0001] This utility model relates to the field of dry ice manufacturing technology, specifically to a solid carbon dioxide inlet throttling device. Background Technology

[0002] In industrial production, solid carbon dioxide (dry ice) is widely used in cold chain transportation, industrial cleaning, food processing, and medical freezing due to its low temperature and minimal residue. In dry ice manufacturing, the core process involves the expansion of high-pressure liquid carbon dioxide through a throttling valve to achieve a solid-gas phase change. Traditional throttling devices face the following technical challenges:

[0003] Under high pressure, carbon dioxide is prone to forming a gas-solid two-phase flow due to a sudden pressure drop during the throttling process. If there is a lack of reasonable flow channel design, unstable flow phenomena such as shock waves and turbulence are likely to occur, resulting in large flow fluctuations and affecting the forming effect of dry ice in the forming cavity.

[0004] After throttling, solid carbon dioxide particles are prone to adhering to the inner wall of the flow channel due to changes in flow velocity. Especially in areas where the flow velocity slows down, such as the diffusion chamber, ice crystals are easy to accumulate and form blockages, requiring frequent shutdowns for cleaning and reducing equipment operating efficiency. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a solid carbon dioxide inlet throttling device, which solves the aforementioned problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: a solid carbon dioxide inlet throttling device, comprising a throttling valve body, a shock-absorbing component one, a stepped diffuser assembly, a shock-absorbing component two, and an outlet valve port, wherein the upper and lower sides of the stepped diffuser assembly are respectively connected to the throttling valve body and the outlet valve port through the shock-absorbing component one and the shock-absorbing component two.

[0009] The stepped diffuser assembly includes a stepped diffuser, a primary diffuser cavity, a straight-tube flow stabilizing section, a secondary diffuser cavity, and an ultrasonic transducer. The stepped diffuser has a primary diffuser cavity, a straight-tube flow stabilizing section, and a secondary diffuser cavity arranged sequentially from top to bottom, and each cavity has a spiral guide groove. An ultrasonic transducer is installed in the middle of the outer side of the stepped diffuser.

[0010] Preferably, the inner diameters of the primary diffusion cavity and the secondary diffusion cavity gradually expand from top to bottom, and the inner diameters of the bottom of the primary diffusion cavity, the straight-tube flow stabilization section, and the top of the secondary diffusion cavity are the same.

[0011] Preferably, the inner walls of the primary diffusion cavity, the straight-tube flow stabilization section, and the secondary diffusion cavity of the stepped diffuser are all treated with nanoscale diamond-like coating.

[0012] Preferably, the damping component one and damping component two have the same structure. The damping component one includes a metal bellows, a rigid tube, flange one, flange two, a composite damping ring, and a clamp. The metal bellows has a rigid tube inside. The upper and lower sides of the damping component one are welded to the throttle valve body and flange one, respectively. Flange two is provided at the upper and lower ends of the stepped diffuser. The composite damping ring is installed between flange one and flange two, and flange one and flange two are pressed together by a clamp.

[0013] Preferably, the composite damping ring comprises a fluororubber layer, a metal mesh reinforced silicone layer, and a polyimide layer, which are sequentially fitted from the inside out and pressed between flange one and flange two.

[0014] Preferably, the throttle valve body includes a valve body, an inlet, a valve core, a valve stem assembly, and a servo motor. The inlet is located in the middle of the right side of the valve body. The valve core is located in the throttle groove of the valve body, and the throttle groove of the valve body communicates with the inlet. A servo motor is installed at the top of the valve body. The servo motor is connected to the valve core through the valve stem assembly. The bottom of the valve body is fixedly connected to the metal bellows and rigid straight pipe of the shock absorption assembly.

[0015] Preferably, the outer wall of the valve body of the throttle valve is connected to the outer wall of the outlet valve port via a connecting frame.

[0016] (III) Beneficial Effects

[0017] This invention provides a solid carbon dioxide inlet throttling device. It has the following beneficial effects:

[0018] 1. By setting up a stepped diffuser assembly, the stepped diffuser is equipped with a primary diffuser chamber for progressive diffusion, a straight-tube stabilizing section, and a secondary diffuser chamber. The primary diffuser chamber initially reduces the flow velocity and suppresses shock waves. The straight-tube stabilizing section ensures thorough mixing of the gas-solid two-phase flow. The secondary diffuser chamber further smooths the flow velocity and avoids local turbulence. The spiral guide channel inside the flow channel guides the fluid to form a swirling flow, reducing dead zones and ensuring uniform distribution of solid particles, thus reducing pressure loss caused by particle enrichment. The inner wall of the stepped diffuser is treated with a nano-scale diamond-like carbon coating, which utilizes the super-ice-repellent properties of the coating to reduce the adhesion of solid carbon dioxide. The ultrasonic transducer on the outside of the stepped diffuser generates micro-vibrations, breaking the bonding force between ice crystals and the inner wall. The swirling flow formed by the spiral guide channel continuously scours the inner wall. This dual effect significantly reduces the risk of blockage.

[0019] 2. A vibration damping component is installed between the stepped diffuser and the throttle valve body and the outlet. The vibration damping component achieves vibration isolation through multi-layer buffering. Among them, the fluororubber layer isolates high-frequency vibration, the metal mesh reinforced silicone layer converts vibration energy into heat energy, the polyimide layer reflects the remaining vibration wave, and finally the vibration is further filtered out by the metal bellows, so as to avoid the vibration generated by the ultrasonic transducer from being transmitted to the throttle valve body and the inlet. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the stepped diffuser assembly structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the shock absorption component in this utility model;

[0023] Figure 4 This is a top view of the composite damping ring structure in this utility model;

[0024] Figure 5 This is a schematic diagram of the main valve body structure in this utility model.

[0025] In the diagram: Throttling valve body-1, shock absorption component one-2, stepped diffuser assembly-3, shock absorption component two-4, outlet valve port-5, connecting frame-6;

[0026] Valve body-11, inlet-12, valve core-13, valve stem assembly-14, servo motor-15;

[0027] Metal corrugated pipe-21, rigid straight pipe-22, flange one-23, flange two-24, composite damping ring-25, clamp-26;

[0028] Fluororubber layer-251, metal mesh reinforced silicone layer-252, polyimide layer-253;

[0029] Stepped diffuser-31, primary diffuser cavity-32, straight-tube flow stabilizing section-33, secondary diffuser cavity-34, ultrasonic transducer-35. Detailed Implementation

[0030] 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.

[0031] Example 1: A solid carbon dioxide inlet throttling device (see example 1) Figure 1 Figure 2 and Figure 5 It includes a throttle valve body 1, a shock absorber assembly 2, a stepped diffuser assembly 3, a shock absorber assembly 4, and an outlet valve port 5. The upper and lower sides of the stepped diffuser assembly 3 are connected to the throttle valve body 1 and the outlet valve port 5 through the shock absorber assembly 2 and the shock absorber assembly 4, respectively.

[0032] The stepped diffuser assembly 3 includes a stepped diffuser 31, a primary diffuser cavity 32, a straight-tube flow stabilizing section 33, a secondary diffuser cavity 34, and an ultrasonic transducer 35. The stepped diffuser 31 has a primary diffuser cavity 32, a straight-tube flow stabilizing section 33, and a secondary diffuser cavity 34 arranged sequentially from top to bottom inside, and each of them is provided with a spiral guide groove. An ultrasonic transducer 35 is installed in the middle of the outer side of the stepped diffuser 31.

[0033] The inner diameters of the primary diffuser 32 and the secondary diffuser 34 gradually expand from top to bottom, and the inner diameters of the bottom of the primary diffuser 32, the straight-tube flow stabilizing section 33, and the top of the secondary diffuser 34 are the same.

[0034] The cone angle of the primary diffuser 32 is 30°, and the cone angle of the secondary diffuser 34 is 15°;

[0035] The stepped diffuser tube 31 is made of 316L stainless steel. The first-stage diffuser cavity 32, the straight-tube flow stabilizing section 33, and the second-stage diffuser cavity 34 of the stepped diffuser tube 31 are all treated with nano-diamond-like coating.

[0036] A flat mounting base for mounting an ultrasonic transducer 35 is provided in the middle of the outer wall of the stepped diffuser 31. The ultrasonic transducer 35 is installed in contact with the flat mounting base by bolts. The ultrasonic transducer 35 is a mature existing technology, such as the ultrasonic transducer with model number SonicsUHP-50-28.

[0037] The throttle valve body 1 includes a valve body 11, an inlet 12, a valve core 13, a valve stem assembly 14, and a servo motor 15. The inlet 12 is located in the middle of the right side of the valve body 11. The valve core 13 is located in the throttle groove of the valve body 11, and the throttle groove of the valve body 11 is connected to the inlet 12. The servo motor 15 is installed at the top of the valve body 11. The servo motor 15 is connected to the valve core 13 through the valve stem assembly 14. The bottom end of the valve body 11 is fixedly connected to the metal bellows 21 and the rigid straight pipe 22 of the shock absorption assembly 2.

[0038] The output end of the servo motor 15 is equipped with a reducer. The valve core 13 is a mature existing technology, which includes a ball screw, a screw nut, a valve stem, and a guide key. The ball screw is connected to the output shaft of the reducer through a coupling. The screw nut is connected to the valve stem. The valve stem is milled with a keyway and assembled with the guide key. The output of the servo motor 15 drives the ball screw to rotate through the reducer. The ball screw drives the screw nut, valve stem, and valve core 13 to move synchronously through the threaded engagement between the ball screw and the screw nut, thereby controlling the movement of the valve core 13. The guide key is used to limit the rotation of the valve stem.

[0039] The outer wall of the valve body 11 of the throttle valve body 1 is connected to the outer wall of the outlet valve port 5 through a connecting frame; to avoid the self-weight of the throttle valve body 1 from putting pressure on the shock absorption component 1 2 and the shock absorption component 2 4, and at the same time to provide stable support for the throttle valve body 1.

[0040] The implementation principle of this application embodiment is as follows:

[0041] High-pressure carbon dioxide enters the valve body 11 from the inlet 12, and after being initially depressurized by the throttling slot of the valve core 13, it enters the stepped diffuser 31.

[0042] After carbon dioxide enters the stepped diffuser 31, it initially expands in the first-stage diffuser 32, suppressing the generation of shock waves.

[0043] The straight-tube steady flow section 33 ensures thorough mixing of the gas-solid two-phase flow and prevents local enrichment of solid particles;

[0044] The secondary diffusion chamber 34 further reduces the flow velocity, allowing the dry ice and snow particles to settle smoothly;

[0045] High-speed carbon dioxide forms a swirling flow through the spiral guide groove, continuously scouring the inner wall of the stepped diffuser tube 31. The super-ice-repellent properties of the nano-diamond-like coating reduce solid adhesion. At the same time, the ultrasonic transducer 35 causes the valve body to vibrate slightly, breaking the bonding force between the ice crystals and the inner wall of the stepped diffuser tube 31, thus achieving an anti-clogging effect.

[0046] Example 2: A solid carbon dioxide inlet throttling device (see example 2) Figure 1 , Figure 3 and Figure 4 The damping components 1 and 2 have the same structure. The damping component 1 includes a metal bellows 21, a rigid tube 22, a flange 1 23, a flange 2 24, a composite damping ring 25, and a clamp 26. The metal bellows 21 has a rigid tube 22 inside. The upper and lower sides of the damping component 1 are welded to the throttle valve body 1 and the flange 1 23 respectively. The upper and lower ends of the stepped diffuser 31 are respectively provided with flange 2 24. The composite damping ring 25 is installed between flange 1 23 and flange 2 24, and flange 1 23 and flange 2 24 are pressed together by clamp 26.

[0047] The top end of the rigid tube 22 of the shock absorber assembly 1 is fixedly connected to the throttle valve body 1, and the throttle groove of the throttle valve body 1 is consistent with the inner diameter of the rigid tube 22. The top end of the rigid tube 22 of the shock absorber assembly 2 is fixed to the flange 24, and the inner diameter of the rigid tube 22 of the shock absorber assembly 2 is consistent with the bottom inner diameter of the secondary diffuser chamber 34.

[0048] The clamp 26 adopts an upper and lower split clamp, which presses the flange 23 and flange 24 together through the upper and lower clamps, and the upper and lower clamps are connected by bolts. The clamp applies a clamping force of 80kN, which compresses the composite damping ring 25 by 30% of its thickness, so that it reaches the optimal energy dissipation state.

[0049] The composite damping ring 25 includes a fluororubber layer 251, a metal mesh reinforced silicone layer 252, and a polyimide layer 253. The fluororubber layer 251, the metal mesh reinforced silicone layer 252, and the polyimide layer 253 are sequentially fitted from the inside to the outside and pressed between flange one 23 and flange two 24.

[0050] The metal bellows 21 is made of Hastelloy C-276, which has good low-temperature toughness, fatigue resistance and corrosion resistance, and meets the vibration reduction effect in low-temperature environments.

[0051] The rigid tube 22 is made of 316L stainless steel, and the inner wall is treated with a nano-diamond-like coating.

[0052] The implementation principle of this application embodiment is as follows:

[0053] First, the fluororubber layer 251 isolates high-frequency vibrations due to its low stiffness.

[0054] Second, the metal mesh reinforced silicone layer 252 undergoes shear deformation, converting vibration energy into heat energy. The metal mesh of the metal mesh reinforced silicone layer 252 is made of 304 stainless steel and impregnated with methyl phenyl silicone rubber. The metal mesh prevents silicone from being extruded and failing under high pressure.

[0055] Third, the polyimide layer 253 reflects the residual vibration wave;

[0056] Fourth, the fluid is finally filtered through the metal bellows 21 and then fed into the throttle valve body 1.

[0057] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0058] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solid carbon dioxide liquid feed throttling device characterized by: It includes a throttle valve body (1), a shock absorber assembly one (2), a stepped diffuser assembly (3), a shock absorber assembly two (4), and an outlet valve port (5). The upper and lower sides of the stepped diffuser assembly (3) are connected to the throttle valve body (1) and the outlet valve port (5) through the shock absorber assembly one (2) and the shock absorber assembly two (4), respectively. The stepped diffuser assembly (3) includes a stepped diffuser (31), a primary diffuser cavity (32), a straight-tube flow stabilizing section (33), a secondary diffuser cavity (34), and an ultrasonic transducer (35). The stepped diffuser (31) is provided with a primary diffuser cavity (32), a straight-tube flow stabilizing section (33), and a secondary diffuser cavity (34) from top to bottom, and each of them is provided with a spiral guide groove. An ultrasonic transducer (35) is installed in the middle of the outer side of the stepped diffuser (31).

2. A solid carbon dioxide liquid feed throttling device according to claim 1, wherein: The inner diameters of the primary diffusion cavity (32) and the secondary diffusion cavity (34) gradually expand from top to bottom, and the inner diameters of the bottom of the primary diffusion cavity (32), the straight-tube flow stabilizing section (33), and the top of the secondary diffusion cavity (34) are the same.

3. A solid carbon dioxide liquid feed throttling device according to claim 1, wherein: The inner walls of the primary diffusion chamber (32), the straight-tube flow stabilization section (33), and the secondary diffusion chamber (34) of the stepped diffuser (31) are all treated with nano-diamond-like coating.

4. A solid carbon dioxide liquid feed throttling device according to claim 1, wherein: The damping component one (2) and damping component two (4) have the same structure. The damping component one (2) includes a metal bellows (21), a rigid pipe (22), a flange one (23), a flange two (24), a composite damping ring (25), and a clamp (26). The metal bellows (21) is provided with a rigid pipe (22). The upper and lower sides of the damping component one (2) are welded to the throttle valve body (1) and the flange one (23) respectively. The upper and lower ends of the stepped diffuser (31) are provided with flange two (24) respectively. The composite damping ring (25) is installed between flange one (23) and flange two (24), and flange one (23) and flange two (24) are pressed together by clamp (26).

5. A solid carbon dioxide liquid feed throttling device according to claim 4, wherein: The composite damping ring (25) includes a fluororubber layer (251), a metal mesh reinforced silicone layer (252), and a polyimide layer (253). The fluororubber layer (251), the metal mesh reinforced silicone layer (252), and the polyimide layer (253) are sequentially fitted from the inside out and pressed between flange one (23) and flange two (24).

6. A solid carbon dioxide liquid feed throttling device according to claim 1, wherein: The throttle valve body (1) includes a valve body (11), an inlet (12), a valve core (13), a valve stem assembly (14), and a servo motor (15). The inlet (12) is provided in the middle right side of the valve body (11). The valve core (13) is provided in the throttle groove of the valve body (11), and the throttle groove of the valve body (11) is connected to the inlet (12). The servo motor (15) is installed at the top of the valve body (11). The servo motor (15) is connected to the valve core (13) through the valve stem assembly (14). The bottom end of the valve body (11) is fixedly connected to the metal bellows (21) and the rigid straight pipe (22) of the shock absorption assembly (2).

7. A solid carbon dioxide liquid feed throttling device as defined in claim 1, wherein: The outer wall of the valve body (11) of the throttle valve body (1) is connected with the outer wall of the outlet valve port (5) through a connecting frame.

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