Combined circulating pump for improving supercritical carbon dioxide conveying efficiency

Abstract

The invention relates to a combined circulating pump for improving supercritical carbon dioxide conveying efficiency, and belongs to the technical field of circulating pumps, the combined circulating pump comprises a plunger pump and a rotor pump, the rotor pump comprises a pump body, a pump cover and an inlet flange, the pump cover is arranged on the pump body, and the inlet flange is arranged on the pump cover; the inlet flange and the pump cover are provided with coaxial medium inflow channels and communicated with an inner cavity of the pump body, a liquid passing hole is formed in the pump body and communicated with the inner cavity of the pump body, a transition ring is arranged in the pump body, the transition ring is coaxial with the pump body and perpendicular to the axis direction of the pump body, one side of the transition ring is communicated with the liquid passing hole, and the other side of the transition ring is communicated with the liquid passing hole. And a plurality of cooling ports are formed in the other side of the transition ring, are uniformly distributed in the circumferential direction of the transition ring, and are formed towards the rotor. The rotor cooling device has the effect of improving the rotor cooling effect.

Description

Technical Field

[0001] This application relates to the field of circulating pump technology, and in particular to a combined circulating pump for improving the efficiency of supercritical carbon dioxide transport. Background Technology

[0002] In the dyeing and printing industry, supercritical carbon dioxide (SCCO) technology is an environmentally friendly alternative to traditional water washing and chemical processes. Supercritical carbon dioxide possesses both fluid and gas properties, making it an excellent solvent for dyeing and finishing textiles. During dyeing using SCCO2 technology, an efficient circulation system is required to maintain the flow of carbon dioxide in the supercritical state. The circulation pump is one of the key pieces of equipment in this system, and its main functions include: maintaining system pressure: To keep carbon dioxide in a supercritical state (i.e., temperature above 31°C and pressure above 73.8 MPa), the circulation pump needs to provide sufficient pressure to ensure the system conditions meet the requirements. Promoting solute dissolution: It can promote the dissolution of solutes such as dyes in supercritical carbon dioxide, thereby improving dyeing efficiency. Uniform dyeing with the help of the circulation pump: The circulation pump ensures sufficient contact between the fabric and the dye liquor, resulting in more uniform dyeing.

[0003] Circulation pumps typically employ plunger pumps, such as... Figure 1 As shown, the plunger pump has advantages such as high rated pressure, high efficiency, compact structure, and convenient flow regulation. However, the piston in the hydraulic end of the plunger pump is prone to temperature rise at the contact point between the piston and the cylinder due to reciprocating movement, which leads to an increase in the temperature of carbon dioxide. It is difficult to ensure that the carbon dioxide is in a supercritical state. Therefore, during the operation of the plunger pump, it is necessary to cool the contact point between the piston and the cylinder.

[0004] Currently, patent document CN117738934A discloses a supercritical carbon dioxide anhydrous dyeing circulation pump, including an external sealing mechanism, a rotating component placed inside the external sealing mechanism, a rotating part outside the external sealing mechanism, and a power device mechanism; the power device mechanism is fixedly connected to one end of the external sealing mechanism; the rotating part outside the external sealing mechanism is located between the external sealing mechanism and the power device mechanism; the power device in the power device mechanism drives the rotating part outside the external sealing mechanism to rotate, such as... Figure 2 As shown, the aforementioned rotary pump is used to cool the contact area between the piston and cylinder of the plunger, thereby ensuring that the carbon dioxide is in a supercritical state.

[0005] However, when carbon dioxide cools the rotor through the liquid passage, the temperature of the carbon dioxide near the rotor rises, and the carbon dioxide entering through the liquid passage is difficult to be delivered to the rotor in a targeted manner, resulting in a relatively poor cooling effect on the rotor. Summary of the Invention

[0006] To improve the cooling effect on the rotor, this application provides a combined circulating pump for improving the efficiency of supercritical carbon dioxide delivery.

[0007] This application provides a combined circulating pump for improving the efficiency of supercritical carbon dioxide transport, employing the following technical solution: A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport includes a plunger pump and a rotor pump. The plunger pump is used to transport supercritical carbon dioxide. The rotor pump includes a pump body, a pump cover, and an inlet flange. The pump cover is disposed on the pump body, and the inlet flange is disposed on the pump cover. The pump cover has an outlet hole communicating with the hydraulic end cylinder of the plunger pump. The inlet flange and the pump cover have coaxial medium inflow channels communicating with the inner cavity of the pump body. The pump body has a through hole communicating with the inner cavity of the pump body. A transition ring is disposed in the pump body. The transition ring is coaxial with the pump body and perpendicular to the axial direction of the pump body. One side of the transition ring communicates with the through hole, and the other side of the transition ring has multiple cooling ports. The cooling ports are evenly arranged along the circumference of the transition ring and face the rotor.

[0008] Optionally, a negative pressure hole is provided in the circumferential direction of the transition ring. The negative pressure hole is connected to the inner cavity of the transition ring. The negative pressure hole is located at the bottom of the transition ring away from the liquid passage hole. A negative pressure component is provided in the pump body. The negative pressure component is used to generate a negative pressure environment at the negative pressure hole. The carbon dioxide extracted from the inner cavity of the transition ring is discharged through the cooling port at the bottom of the transition ring.

[0009] Optionally, the negative pressure component includes a negative pressure plate fixedly disposed at the end of the inner rotor. The length direction of the negative pressure plate is parallel to the axial direction of the pump body. The negative pressure plate extends to the transition ring and spans across the negative pressure hole. A gap is left between the negative pressure plate and the transition ring. The rotation of the inner rotor drives the negative pressure plate to rotate, thereby forming a negative pressure state at the negative pressure hole.

[0010] Optionally, multiple negative pressure plates are provided and evenly arranged along the circumference of the inner rotor, and the multiple negative pressure plates are combined into a sleeve shape and the transition ring is sleeved inside.

[0011] Optionally, the vertical cross-section of the transition ring is rectangular, the negative pressure plate is perpendicular to the transition ring, and rollers are provided on the side of the negative pressure plate. The rollers are supported on the circumference of the transition ring and are staggered with the negative pressure holes.

[0012] Optionally, the transition ring is provided with a ring magnet in the circumferential direction. The ring magnet is coaxial with the pump body, and the roller is a metal roller that is attracted to the ring magnet. The roller is attracted to the circumferential surface of the ring magnet.

[0013] Optionally, the inner rotor is provided with multiple inclined plates at its end. The inclined plates are evenly arranged around the end of the inner rotor. The inclined plates and the end face of the inner rotor form a cooling space. The rotation of the inner rotor drives the inclined plates to rotate, thereby retaining carbon dioxide in the cooling space and cooling the inner rotor.

[0014] Optionally, the inner ring of the transition ring is provided with a cooling pipe, which is connected to the inner cavity of the transition ring. The cooling pipe enters the pump body main shaft mounting hole and is connected to the main shaft mounting hole. The carbon dioxide in the transition ring enters the main shaft mounting hole through the cooling pipe to cool the main shaft.

[0015] Optionally, the negative pressure plate has multiple balance holes on its surface. These balance holes allow carbon dioxide to pass through the negative pressure plate and reduce its load when the negative pressure plate rotates.

[0016] Optionally, the negative pressure plate has multiple ribbed reinforcing bars on its surface.

[0017] In summary, this application includes at least one of the following beneficial technical effects: The rotary pump delivers supercritical carbon dioxide from the outflow channel to the cylinder of the hydraulic end of the plunger pump, cooling the cylinder and ensuring that the piston is at the same temperature as the delivered carbon dioxide, thus ensuring the supercritical state of the carbon dioxide. When supercritical carbon dioxide is transported, carbon dioxide enters the pump body through the medium inflow channel. Part of the pump body is transferred through the pump body outlet, and the rest enters the transition ring through the liquid passage. The carbon dioxide that enters the transition ring fills the transition ring and is discharged from the cooling port on the transition ring. The discharged carbon dioxide cools the inner rotor, thereby improving the cooling effect on the inner rotor. Multiple cooling vents are opened and evenly arranged circumferentially, which facilitates the injection of carbon dioxide from multiple outlets to cool the inner rotor, thereby improving the cooling effect on the inner rotor. Multiple cooling ports are provided to facilitate the more even distribution of carbon dioxide within the pump body cavity, thereby further improving the cooling effect on the inner rotor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a plunger pump; Figure 2 This is a schematic diagram of a structure that uses a rotary pump to cool a plunger pump; Figure 3 This is a schematic diagram of the overall structure of a rotor pump in a combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to an embodiment of this application; Figure 4 This is a cross-sectional view of the rotor pump in an embodiment of this application; Figure 5 yes Figure 4An enlarged schematic diagram of part A in the middle; Figure 6 This is a schematic diagram of the transition ring in a combined circulating pump used to improve the efficiency of supercritical carbon dioxide transport according to an embodiment of this application; Figure 7 This is an exploded schematic diagram of the rotor and transition ring in a combined circulating pump used to improve the efficiency of supercritical carbon dioxide transport according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Pump body; 2. Pump cover; 3. Inlet flange; 4. Medium inflow channel; 5. Transition ring; 6. Cooling port; 7. Negative pressure hole; 8. Negative pressure plate; 9. Annular magnet; 10. Roller; 11. Balance hole; 12. Inclined plate; 13. Cooling space; 14. Rotor; 15. Liquid passage hole; 16. Plunger pump; 17. Rotary pump; 18. Liquid outlet hole. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 3-7 This application will be described in further detail.

[0021] This application discloses a combined circulating pump for improving the efficiency of supercritical carbon dioxide transport. (Refer to...) Figure 3 and Figure 4 The combined circulating pump for improving the efficiency of supercritical carbon dioxide transport includes a plunger pump 16 and a rotor pump 17. The rotor pump 17 includes a pump body 1, a pump cover 2 and an inlet flange 3. The pump cover 2 is disposed on the pump body 1 and has an outlet hole 18 that communicates with the hydraulic end cylinder of the plunger pump 16. The inlet flange 3 is disposed on the pump cover 2 and has a coaxial medium inflow channel 4 that communicates with the inner cavity of the pump body 1 on the inlet flange 3 and the pump cover 2. A liquid passage hole 15 is provided in the pump body 1 and communicates with the inner cavity of the pump body 1. Combination Figure 4 and Figure 5 A transition ring 5 is provided inside the pump body 1. The transition ring 5 is fixedly installed inside the pump body 1. The transition ring 5 is coaxial with the pump body 1 and perpendicular to the axis of the pump body 1. One side of the transition ring 5 is connected to the liquid passage hole 15. Multiple cooling ports 6 are opened on the other side of the transition ring 5. The cooling ports 6 are evenly arranged along the circumference of the transition ring 5 and are opened towards the rotor 14.

[0022] When supercritical carbon dioxide is transported, carbon dioxide enters the pump body 1 through the medium inflow channel 4. Part of the pump body 1 is transferred through the pump body 1 outlet, and the rest enters the transition ring 5 through the liquid passage 15. The carbon dioxide entering the transition ring 5 fills the transition ring 5 and is discharged from the cooling port 6 on the transition ring 5. The discharged carbon dioxide cools the inner rotor 14, thereby improving the cooling effect on the inner rotor 14.

[0023] Reference Figure 5 , Figure 6 and Figure 7 In this embodiment, after carbon dioxide enters the transition ring 5, it is easy for the carbon dioxide to move out from the cooling port 6 near the inlet, resulting in less carbon dioxide flowing out from the lower cooling port 6, which leads to a relatively poor cooling effect on the inner rotor 14. Therefore, in order to facilitate a more uniform flow of carbon dioxide, a negative pressure hole 7 is provided in the circumferential direction of the transition ring 5. The negative pressure hole 7 is connected to the inner cavity of the transition ring 5. The negative pressure hole 7 is located at the bottom of the transition ring 5 away from the liquid passage hole 15. A negative pressure component is provided in the pump body 1. The negative pressure component is used to generate a negative pressure environment at the negative pressure hole 7, and the carbon dioxide drawn from the inner cavity of the transition ring 5 is discharged through the cooling port 6 at the lower part of the transition ring 5. Reference Figure 5 , Figure 6 and Figure 7 The negative pressure component includes a negative pressure plate 8 fixedly installed at the end of the inner rotor 14. The negative pressure plate 8 is elongated and its length direction is parallel to the axis of the pump body 1. The negative pressure plate 8 extends to the transition ring 5 and crosses to the negative pressure hole 7. A gap is left between the negative pressure plate 8 and the transition ring 5. The rotation of the inner rotor 14 drives the negative pressure plate 8 to rotate, and a negative pressure state is formed at the negative pressure hole 7.

[0024] When the motor drives the rotor 14 to rotate, the rotor 14 drives the negative pressure plate 8 to rotate. The rotation of the negative pressure plate 8 causes the gas near the negative pressure hole 7 to move out and form a negative pressure state at the above-mentioned location. This draws the carbon dioxide from the upper part of the inner cavity of the transition ring 5 to the lower part, so that the carbon dioxide in the transition ring 5 can be more evenly filled in the inner cavity of the transition ring 5. This also makes it easier for the cooling port 6 on the transition ring 5 to release carbon dioxide to cool the rotor 14.

[0025] Reference Figure 5 , Figure 6 and Figure 7 In this embodiment of the application, multiple negative pressure plates 8 are provided and are evenly arranged along the circumference of the inner rotor 14. The multiple negative pressure plates 8 are combined into a sleeve shape and the transition ring 5 is sleeved inside. The multiple negative pressure plates 8 make it easy for the negative pressure hole 7 to be in a negative pressure state, and to facilitate the extraction of carbon dioxide from the transition ring 5 to the lower part.

[0026] Reference Figure 5 , Figure 6 and Figure 7 In this embodiment, the vertical cross-section of the transition ring 5 is rectangular, the negative pressure plate 8 is perpendicular to the transition ring 5, and the side of the negative pressure plate 8 is provided with a roller 10. The roller 10 is supported on the circumference of the transition ring 5 and is intersected with the negative pressure hole 7. When the negative pressure plate 8 rotates, the roller 10 is supported on the transition ring 5, which reduces the possibility that the negative pressure plate 8 will collide with the transition ring 5 during the rotation process, thereby facilitating the stabilization of the negative pressure plate 8 and creating a negative pressure strip at the negative pressure hole 7.

[0027] Reference Figure 5 , Figure 6 and Figure 7 Furthermore, a ring magnet 9 is fixedly arranged circumferentially on the transition ring 5. The ring magnet 9 is ring-shaped and coaxial with the pump body 1. The roller 10 is a metal roller that is attracted to the ring magnet 9. The roller 10 is attracted to the circumferential surface of the ring magnet 9. The roller 10 is attracted to the ring magnet 9 to reduce the possibility that the roller 10 will continuously collide with the transition ring 5 under the drive of the negative pressure plate 8, thereby facilitating the stable operation of the negative pressure plate 8.

[0028] Reference Figure 5 , Figure 6 and Figure 7 When the rotor 14 rotates at high speed, carbon dioxide greatly hinders the rotation of the negative pressure plate 8, which can easily cause the negative pressure plate 8 to bend. Therefore, in this embodiment, a plurality of balance holes 11 are provided on the surface of the negative pressure plate 8. The balance holes 11 are used to allow carbon dioxide to pass through the negative pressure plate 8 when the negative pressure plate 8 rotates, thereby reducing the load on the negative pressure plate 8. During the process of passing through the balance holes 11, it is convenient for carbon dioxide to pass through the balance holes 11, thereby reducing the possibility of the negative pressure plate 8 bending.

[0029] Reference Figure 5 , Figure 6 and Figure 7 Furthermore, to reduce the possibility of bending of the negative pressure plate 8, multiple ribbed reinforcing bars are provided on the surface of the negative pressure plate 8.

[0030] Reference Figure 5 , Figure 6 and Figure 7 To improve the cooling effect of carbon dioxide on rotor 14, multiple inclined plates 12 are provided at the end of inner rotor 14. The inclined plates 12 are evenly arranged circumferentially along the end of inner rotor 14 and are inclinedly disposed on the end face of inner rotor 14. The inclined plates 12 and the end face of inner rotor 14 form a cooling space 13. When inner rotor 14 rotates, it drives the inclined plates 12 to rotate, thereby retaining carbon dioxide in the cooling space 13 and cooling inner rotor 14. When rotor 14 rotates at high speed, carbon dioxide is placed in the cooling space 13, thereby continuously cooling the end face of inner rotor 14 and improving the cooling effect on rotor 14.

[0031] Reference Figure 5 , Figure 6 and Figure 7 In this embodiment, a cooling pipe is provided in the inner ring of the transition ring 5. The cooling pipe communicates with the inner cavity of the transition ring 5 and enters the main shaft mounting hole of the pump body 1 and communicates with the main shaft mounting hole. Carbon dioxide in the transition ring 5 enters the main shaft mounting hole through the cooling pipe to cool the main shaft. Carbon dioxide entering the transition ring 5 enters the main shaft mounting hole through the cooling pipe. The carbon dioxide cools the main shaft and lubricates the mounting bearing of the main shaft, thereby facilitating the rotation of the main shaft and reducing the wear of the main shaft.

[0032] The implementation principle of a combined circulating pump for improving the efficiency of supercritical carbon dioxide transport in this application embodiment is as follows: During supercritical carbon dioxide transport, carbon dioxide enters the pump body 1 through the medium inflow channel 4. Part of the carbon dioxide is transferred through the pump body 1 outlet, and the rest enters the transition ring 5 through the liquid passage 15. The carbon dioxide entering the transition ring 5 fills the transition ring 5 and is discharged from the cooling port 6 on the transition ring 5. The discharged carbon dioxide cools the inner rotor 14, thereby improving the cooling effect of the inner rotor 14. Multiple cooling ports 6 are opened and evenly arranged in the circumferential direction, which facilitates the multiple outlets of carbon dioxide to spray out and cool the inner rotor 14, thereby improving the cooling effect of the inner rotor 14. The multiple cooling ports 6 also facilitate the more uniform filling of carbon dioxide in the cavity of the pump body 1, which cools the inner rotor 14, further improving the cooling effect of the inner rotor 14.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport, characterized in that: The system includes a plunger pump (16) and a rotary pump (17). The plunger pump (17) is used to transport supercritical carbon dioxide, and the rotary pump (17) is used to transport carbon dioxide into the plunger pump (16) for cooling. The rotary pump (17) includes a pump body (1), a pump cover (2), and an inlet flange (3). The pump cover (2) is disposed on the pump body (1), and the inlet flange (3) is disposed on the pump cover (2). The pump cover (1) has an outlet hole (18) communicating with the hydraulic end cylinder of the plunger pump (1). The inlet flange (3) and the pump cover (2) have coaxial... The medium flows into the channel (4) and communicates with the inner cavity of the pump body (1). The pump body (1) has a liquid passage (15) and communicates with the inner cavity of the pump body (1). The pump body (1) is provided with a transition ring (5). The transition ring (5) is coaxial with the pump body (1). The transition ring (5) is perpendicular to the axial direction of the pump body (1). One side of the transition ring (5) is connected to the liquid passage (15). The other side of the transition ring (5) is provided with multiple cooling ports (6). The cooling ports (6) are evenly arranged along the circumference of the transition ring (5). The cooling ports (6) are opened towards the rotor (14).

2. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 1, characterized in that: The transition ring (5) has a negative pressure hole (7) on its circumference. The negative pressure hole (7) is connected to the inner cavity of the transition ring (5). The negative pressure hole (7) is located at the bottom of the transition ring (5) away from the liquid passage hole (15). The pump body (1) is equipped with a negative pressure component. The negative pressure component is used to generate a negative pressure environment at the negative pressure hole (7). The carbon dioxide extracted from the inner cavity of the transition ring (5) is discharged through the cooling port (6) at the bottom of the transition ring (5).

3. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 2, characterized in that: The negative pressure component includes a negative pressure plate (8) fixedly installed at the end of the inner rotor (14). The length direction of the negative pressure plate (8) is parallel to the axial direction of the pump body (1). The negative pressure plate (8) extends to the transition ring (5) and spans across the negative pressure hole (7). There is a gap between the negative pressure plate (8) and the transition ring (5). The rotation of the inner rotor (14) drives the negative pressure plate (8) to rotate, and a negative pressure state is formed at the negative pressure hole (7).

4. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 3, characterized in that: The negative pressure plates (8) are arranged in multiple ways and are evenly distributed along the circumference of the inner rotor (14). The multiple negative pressure plates (8) are combined into a sleeve shape and the transition ring (5) is sleeved inside.

5. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 3, characterized in that: The vertical cross section of the transition ring (5) is rectangular. The negative pressure plate (8) is perpendicular to the transition ring (5). Rollers (10) are provided on the side of the negative pressure plate (8). The rollers (10) are supported on the circumference of the transition ring (5) and are intersected with the negative pressure holes (7).

6. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 5, characterized in that: The transition ring (5) is provided with a ring magnet (9) in the circumferential direction. The ring magnet (9) is coaxial with the pump body (1). The roller (10) is a metal roller that is attracted to the ring magnet (9). The roller (10) is attracted to the circumferential surface of the ring magnet (9).

7. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 1, characterized in that: Multiple inclined plates (12) are provided at the end of the inner rotor (14). The inclined plates (12) are evenly arranged circumferentially along the end of the inner rotor (14). The inclined plates (12) and the end face of the inner rotor (14) form a cooling space (13). The rotation of the inner rotor (14) drives the inclined plates (12) to rotate, thereby retaining carbon dioxide in the cooling space (13) and cooling the inner rotor (14).

8. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 1, characterized in that: The transition ring (5) is provided with a cooling pipe in the inner ring. The cooling pipe is connected to the inner cavity of the transition ring (5). The cooling pipe enters the main shaft mounting hole of the pump body (1) and is connected to the main shaft mounting hole. The carbon dioxide in the transition ring (5) enters the main shaft mounting hole through the cooling pipe to cool the main shaft.

9. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 3, characterized in that: The negative pressure plate (8) has multiple balance holes (11) on its surface. The balance holes (11) are used to allow carbon dioxide to pass through the negative pressure plate (8) when the negative pressure plate (8) rotates, thereby reducing the load on the negative pressure plate (8).

10. A combined circulating pump for improving the efficiency of supercritical carbon dioxide transport according to claim 9, characterized in that: The negative pressure plate (8) has multiple ribbed reinforcing bars on its surface.

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