CN221921433U - Supercritical carbon dioxide anhydrous dyeing circulating pump - Google Patents

Abstract

The utility model relates to a supercritical carbon dioxide anhydrous dyeing circulating pump, which comprises: the device comprises an external sealing mechanism, a rotating assembly arranged inside the external sealing mechanism, a rotating piece 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 piece outside the external sealing mechanism is positioned between the external sealing mechanism and the power device mechanism; driving a rotating piece outside the external sealing mechanism to rotate through a power device in the power device mechanism; the pump has the advantages of no leakage, simple structure, low processing precision requirement, convenient flow regulation, stable operation and the like; the bearing in the pump body adopts a ceramic ball bearing, and compared with a sliding bearing, the friction area is small, the friction loss is small, and the transmission efficiency is high; the friction loss is small, the heating value is small, the influence of friction heat on the medium temperature is reduced, the medium vaporization is prevented, the supercritical state of the medium CO2 is kept, and the medium characteristics are not influenced.

Description

A supercritical carbon dioxide anhydrous dyeing circulation pump

Technical Field

The utility model relates to a supercritical carbon dioxide anhydrous dyeing circulation pump, belonging to the technical field of supercritical fluid medium transportation.

Background Art

At present, the circulation pumps used in the dyeing industry generally adopt plunger pumps, which are reciprocating positive displacement pumps. They are composed of motors, transmission boxes, plungers, cylinders, valve seats and other components. Driven by the motor through the transmission mechanism, the plunger reciprocates in the cylinder to achieve the suction and discharge of liquid. The existing pumps have the following defects: complex structure, high precision requirements for parts processing, easy wear of plungers, difficult flow adjustment, and easy pulsation;

At the same time, in the internal structure of the pump body, the main shaft or central shaft passing through the center of the pump body is usually connected to the pump body by bearings, and generally adopts the form of sliding bearings. This form has a large friction area, which not only has low transmission efficiency, but also generates a large amount of heat, increases the impact of friction on the temperature of the medium, and is prone to gasification of the medium, which is not conducive to the supercritical state of the medium carbon dioxide, affecting the medium properties.

Utility Model Content

In view of the above-mentioned technical problems, the purpose of the utility model is to provide a supercritical carbon dioxide anhydrous dyeing circulation pump, which is simple to operate, has a long service life, and a stable flow rate that is easy to adjust.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a supercritical carbon dioxide anhydrous dyeing circulation pump, comprising: an external sealing mechanism, a rotating assembly 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 rotating part outside the external sealing mechanism is driven to rotate by the power device in the power device mechanism, thereby driving the rotating assembly inside the external sealing mechanism to rotate inside the external sealing mechanism to realize the operation of the pump;

Further, the external sealing mechanism comprises: a pump cover, a pump body, an isolation sleeve, an inlet flange at the front end of the pump cover, an outlet flange at the upper part of the pump body, a sealing ring and bolts; the inlet flange is connected to the front end of the pump cover by bolts and is sealed by a sealing ring arranged in an annular manner, the rear end of the pump cover is connected to the pump body by bolts and is sealed between the pump cover and the pump body by a sealing ring arranged in an annular manner, the rear end of the pump body is connected to the isolation sleeve by bolts and is sealed between the pump body and the sealing ring by a sealing ring arranged in an annular manner, the upper end of the pump body is provided with an outlet flange, the outlet flange is connected to the pump body by bolts and a sealing ring is arranged in an annular manner between the outlet flange and the pump body;

Furthermore, the isolation sleeve is a semi-enclosed U-shaped sleeve structure, and one end of the U-shaped sleeve opening is connected to the rear end of the pump body;

In the above technical solution, the inlet flange, pump cover, pump body, outlet flange and isolation sleeve together form a sealing cavity through sealing rings and bolts at their respective positions, thereby forming an external sealing mechanism; wherein the sealing rings of each part are static seals to achieve complete leakage-free operation;

Furthermore, the rotating assembly inside the external sealing mechanism includes: a main shaft located at the center of the cavity of the external sealing mechanism, the front end of the main shaft is connected to an impeller through a key, and the rear end is connected to an inner rotor through a key, the impeller and the inner rotor are respectively connected in series through the two ends of the main shaft and are respectively fixed to the main shaft through shaft head bolts; a bearing group is provided at the rear end of the impeller and between the pump body and the main shaft;

The bearing group is composed of two sets of bearings, which are respectively located at the shoulders of the two ends of the main shaft; the bearing close to the impeller is called the first bearing, and the bearing close to the inner rotor is called the second bearing;

The key point in this solution is that the two bearings mentioned above are ceramic ball bearings, not sliding bearings in the prior art. Compared with sliding bearings, this design has a small friction area, small friction loss, and high transmission efficiency. It has small friction loss and low heat generation, which reduces the impact of friction heat on the medium temperature, prevents the medium from vaporizing, and is more conducive to maintaining the medium CO2 in a supercritical state without affecting the medium properties.

Furthermore, a keyway is provided on the inner diameter of the inner rotor corresponding to the outer diameter of the main shaft, and the inner rotor is connected to the main shaft by the cooperation of the key and the keyway; an axial center through hole is processed in the center of the shaft head bolt at the end of the main shaft, and after the shaft head bolt is screwed into the shaft end of the main shaft, the axial center through hole of the shaft head bolt is exactly matched with the axial center hole of the main shaft to be connected to form a through hole.

The outer diameter surface of the inner rotor is evenly provided with grooves, and permanent magnets are embedded in the grooves;

Furthermore, the rotating part outside the external sealing mechanism is an outer rotor, and an equal number of permanent magnets are also arranged at positions on the inner diameter surface of the outer rotor corresponding to the permanent magnets of the inner rotor; the permanent magnets on the inner rotor and the permanent magnets on the outer rotor are arranged alternately with N poles and S poles in the circumferential direction;

Furthermore, the power device mechanism includes: an electric motor, a motor shaft, a connecting frame and bolts; the rear end of the outer rotor is mounted on the motor shaft of the electric motor, a connecting frame is arranged between the electric motor and the pump body, the front end of the connecting frame is fixedly connected to the pump body by bolts, and the rear end of the connecting frame is connected to the electric motor by bolts; the bottom of the electric motor is fixed to the base by a motor bracket;

Furthermore, a magnetic conductive ring is designed inside the inner rotor to control the transmission route of magnetic lines of force, reduce magnetic force loss, and improve transmission efficiency;

Furthermore, the connecting frame and the outer rotor are made of magnetic conductive materials, and the magnetic line transmission route is designed to reduce magnetic loss and improve transmission efficiency. At the same time, the magnetic lines are enclosed in the connecting frame, and the magnetic lines do not leak out, thereby shielding the magnetic field, avoiding magnetic interference of the magnetic field on electronic components around the circulating pump, and improving electromagnetic compatibility.

Furthermore, the inlet flange and the center of the pump cover are both provided with a medium inflow channel, and the medium enters the pump through the medium inflow channel of the inlet flange and the pump cover in turn;

Furthermore, a liquid hole is provided on the pump body, and the liquid hole connects the inner cavity of the pump body with the cavity where the inner rotor is located to form a passage for a small amount of medium to flow in and take away the heat generated by the inner rotor and the isolation sleeve, thereby protecting the inner rotor from demagnetization.

Furthermore, the medium inflow channel of the pump cover is in the shape of a bell mouth that is narrow in the front and wide in the back, and the medium inflow channel of the inlet flange is in the shape of a straight cylinder;

The advantages of using the bell mouth as mentioned above are: 1. The smaller channel area of the inlet flange is smoothly transitioned to the larger channel area of the impeller inlet, the medium pressure will not change suddenly, and the medium flows smoothly, which is conducive to preventing vaporization; 2. The increase in the flow channel area will reduce the flow velocity of the medium at the impeller inlet channel, which is conducive to preventing vaporization.

Furthermore, the spindle is provided with axial and radial center holes from the rear end to the front end, and the axial center hole and the radial center hole form a T-shaped arrangement; the radial center hole is opened at the center position between the two sets of bearings and the two ends are connected to the cavities where the two sets of bearings are located; one end of the axial center hole is located at the end of the spindle, and the other end extends to the radial center hole and is connected to the radial center hole;

In order to further optimize the above technical solution, a valve is installed in the pipeline connected to the outlet flange, and the output flow rate can be easily adjusted by adjusting the size of the valve opening.

The working process of the circulation pump adopting the above structure of the utility model is as follows:

When working, supercritical CO2 first flows into the sealing cavity of the external sealing mechanism from the medium flow channel of the inlet flange and fills it up, and the supercritical CO2 maintains a continuous supply state;

When the motor is powered on, the motor shaft drives the outer rotor to rotate. The outer rotor drives the inner rotor to rotate through the magnetic effect. The inner rotor drives the impeller to rotate through the shaft. The centrifugal force generated by the rotation of the impeller drives most of the supercritical CO2 in the pump body out through the outlet flange. At the same time, a vacuum is formed at the impeller inlet. Supercritical CO2 is replenished through the inlet flange and then driven out from the outlet flange through the impeller. This is repeated to achieve the purpose of supercritical CO2 circulation.

At the same time, a small part of the supercritical CO2 flows through the liquid hole of the pump body to the cavity where the inner rotor is located, and enters the axial center hole and radial center hole of the main shaft from the end of the main shaft through the gap between the outer circle of the inner rotor and the inner circle of the isolation sleeve, and reaches the cavity where the two sets of bearings are located, and then flows to the impeller through the gap of the first bearing close to the impeller direction. This process takes away the heat generated by the inner rotor and the isolation sleeve, protecting the inner rotor from demagnetization; the motor runs continuously, and the supercritical CO2 can be continuously pumped out by the impeller, and the operation is stable;

In the flow path design of a small portion of the supercritical CO2 liquid flow mentioned above, two flow paths can be formed; after flowing from the liquid hole of the pump body into the cavity where the inner rotor is located, the medium can not only enter the axial and radial center holes of the main shaft from the gap between the inner rotor and the isolation sleeve from the rear end of the main shaft to the cavity where the bearing is located, and finally flow to the impeller through the gap of the first bearing; the medium can also enter the cavity where the bearing is located from the cavity where the inner rotor is located through the gap of the second bearing, and then flow to the impeller through the gap of the first bearing.

The purpose of the flow path design of the small portion of the supercritical CO2 liquid flow mentioned above is to: 1. take away the heat generated by the inner rotor and the isolation sleeve to protect the inner rotor from demagnetization; 2. take away the friction heat of the bearing and lubricate the bearing at the same time to protect the bearing from normal operation and damage.

The beneficial effects of adopting the circulation pump of the utility model are:

The pump is a centrifugal magnetic drive pump with the advantages of no leakage, simple structure, low machining precision requirements, convenient flow adjustment and stable operation. Compared with existing pumps, the bearings in the pump body use ceramic ball bearings, which have a small friction area, small friction loss and high transmission efficiency compared with sliding bearings. The small friction loss and low heat generation reduce the influence of friction heat on the medium temperature, prevent the medium from vaporizing, and are more conducive to maintaining the supercritical state of the medium CO2 without affecting the medium properties.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a structural diagram of a supercritical carbon dioxide anhydrous dyeing circulation pump of the utility model.

FIG. 2 is a structural diagram of the shaft head bolt in FIG. 1 .

FIG. 3 is a side view of FIG. 2 .

In the figure, 1, pump cover, 2, pump body, 3, isolation sleeve, 4, inlet flange, 5, outlet flange, 6, sealing ring, 7, bolt, 8, main shaft, 9, impeller, 10, inner rotor, 11, shaft head bolt, 11.1, axial center through hole of shaft head bolt, 12, first bearing, 13, second bearing, 14, permanent magnet, 15, outer rotor, 16, motor, 17, motor shaft, 18, connecting frame, 19, motor bracket, 20, base, 4.1, medium inflow channel of inlet flange, 1.1, medium inflow channel of pump cover, 21, liquid hole, 22, axial center hole, 23, radial center hole.

DETAILED DESCRIPTION

In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

A supercritical carbon dioxide anhydrous dyeing circulation pump as shown in Figure 1-3 includes: an external sealing mechanism, a rotating assembly 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 rotating part outside the external sealing mechanism is driven to rotate by the power device in the power device mechanism, thereby driving the rotating assembly inside the external sealing mechanism to rotate inside the external sealing mechanism to realize the operation of the pump;

The external sealing mechanism comprises: a pump cover 1, a pump body 2, an isolation sleeve 3, an inlet flange 4 located at the front end of the pump cover 1, an outlet flange 5 at the upper part of the pump body 2, a sealing ring 6 and bolts 7; the inlet flange 4 is connected to the front end of the pump cover 1 by bolts 7 and is sealed by a sealing ring 6 arranged in an annular manner, the rear end of the pump cover 1 is connected to the pump body 2 by bolts 7 and is sealed between the pump cover 1 and the pump body 2 by a sealing ring 6 arranged in an annular manner, the rear end of the pump body 2 is connected to the isolation sleeve 3 by bolts 7 and is sealed between the pump body 2 and the sealing ring 6 by a sealing ring 6 arranged in an annular manner, the upper end of the pump body 2 is provided with an outlet flange 5, the outlet flange 5 is connected to the pump body 2 by bolts 7 and a sealing ring 6 is arranged in an annular manner between the outlet flange 5 and the pump body 2;

The isolation sleeve 3 is a semi-enclosed U-shaped sleeve structure, and one end of the U-shaped sleeve opening is connected to the rear end of the pump body 2;

In the above technical solution, the inlet flange 4, the pump cover 1, the pump body 2, the outlet flange 5, and the isolation sleeve 3 together form a sealing cavity through the sealing rings 6 and bolts 7 at their respective positions, thereby forming an external sealing mechanism; wherein the sealing rings 6 of each part are static seals, achieving complete leakage-free;

The rotating assembly inside the external sealing mechanism includes: a main shaft 8 located at the center of the cavity of the external sealing mechanism, the front end of the main shaft 8 is connected to an impeller 9 through a key, and the rear end is connected to an inner rotor 10 through a key, the impeller 9 and the inner rotor 10 are connected in series through the two ends of the main shaft 8 and are fixed to the main shaft 8 through shaft head bolts 11 respectively; a bearing group is provided at the rear end of the impeller 9 and between the pump body 2 and the main shaft 8;

The bearing group is composed of two sets of bearings, which are respectively located at the shoulder positions at both ends of the main shaft 8; the bearing close to the impeller 9 is called the first bearing 12, and the bearing close to the inner rotor 10 is called the second bearing 13; the two bearings are ceramic ball bearings;

A keyway is arranged on the inner diameter of the inner rotor 10 corresponding to the outer diameter of the main shaft 8, and the inner rotor 10 is connected to the main shaft 8 by the cooperation of the key and the keyway; an axial center through hole 11.1 is processed in the center of the shaft head bolt 11 at the end of the main shaft 8, and after the shaft head bolt 11 is screwed into the shaft end of the main shaft 8, the axial center through hole 11.1 of the shaft head bolt just cooperates with the axial center hole 22 of the main shaft 8 to form a through hole.

The outer diameter surface of the inner rotor 10 is uniformly provided with grooves, and permanent magnets 14 are embedded in the grooves;

The rotating part outside the external sealing mechanism is the outer rotor 15, and the positions of the inner diameter surface of the outer rotor 15 corresponding to the permanent magnets 14 of the inner rotor 10 are also provided with an equal number of permanent magnets 14; the permanent magnets 14 on the inner rotor 10 and the permanent magnets 14 of the outer rotor 15 are alternately arranged with N poles and S poles in the circumferential direction;

The two bearing outer rings are mounted on the pump body 2 as stationary parts, and the outer rotor 15 is mounted on the motor shaft 17 as a rotating part. The gap between the stationary parts and the rotating parts is large, and the general matching tolerance can be used, and the processing accuracy requirement is low.

The power device mechanism includes: an electric motor 16, a motor shaft 17, a connecting frame 18 and bolts 7; the rear end of the outer rotor 15 is installed on the motor shaft 17 of the electric motor 16, and a connecting frame 18 is arranged between the electric motor 16 and the pump body 2. The front end of the connecting frame 18 is fixedly connected to the pump body 2 by bolts 7, and the rear end of the connecting frame 18 is connected to the electric motor 16 by bolts 7; the bottom of the electric motor 16 is fixed to the base 20 by a motor bracket 19;

In the above structure, the inlet flange 4 and the center of the pump cover 1 are both provided with a medium inflow channel, and the medium enters the pump through the medium inflow channel of the inlet flange and the pump cover in turn;

The pump body 2 is provided with a liquid hole 21, which connects the inner cavity of the pump body 2 with the cavity where the inner rotor 10 is located to form a passage. The medium inflow channel 1.1 of the pump cover is in a trumpet shape that is narrow in front and wide in the back, and the medium inflow channel 4.1 of the inlet flange is in a straight cylindrical shape.

The spindle 8 is provided with axial and radial center holes from the rear end to the front end, and the axial center hole 22 and the radial center hole 23 form a T-shaped arrangement; the radial center hole 23 is opened at the center position between the two sets of bearings and both ends are connected to the cavities where the two sets of bearings are located; one end of the axial center hole 22 is located at the end of the spindle 8, and the other end extends to the radial center hole 23 and is connected to the radial center hole 23.

The working process of the circulation pump adopting the above structure of the utility model is as follows:

When working, supercritical CO2 first flows from the medium of the inlet flange into the channel 4.1 and enters the sealing cavity of the external sealing mechanism and fills it up, and the supercritical CO2 maintains a continuous supply state;

The motor 16 is powered on, and the motor shaft 17 drives the outer rotor 15 to rotate. The outer rotor 15 drives the inner rotor 10 to rotate through the magnetic effect. The inner rotor 10 drives the impeller 9 to rotate through the main shaft 8. The centrifugal force generated by the rotation of the impeller 9 drives most of the supercritical CO2 in the pump body 2 out through the outlet flange 5. At the same time, a vacuum is formed at the inlet of the impeller 9, and the supercritical CO2 is replenished through the inlet flange 4 and then driven out from the outlet flange 5 through the impeller 9. This is repeated to achieve the purpose of supercritical CO2 circulation.

At the same time, a small portion of supercritical CO2 flows through the liquid hole 21 of the pump body 2 to the cavity where the inner rotor 10 is located, and enters the axial center hole 22 and the radial center hole 23 of the main shaft 8 from the end of the main shaft 8 through the gap between the outer circle of the inner rotor 10 and the inner circle of the isolation sleeve 3, and reaches the cavity where the two sets of bearings are located, and then flows to the impeller 9 through the gap of the first bearing 12 close to the impeller 9. This process takes away the heat generated by the inner rotor 10 and the isolation sleeve 3, protecting the inner rotor 10 from demagnetization; the motor 16 runs continuously, and the supercritical CO2 can be continuously pumped out by the impeller 9, and the operation is stable;

In the flow path design of the above-mentioned small portion of the supercritical CO2 liquid flow, two flow paths can be formed; after flowing from the liquid hole 21 of the pump body 2 into the cavity where the inner rotor 10 is located, the medium can not only enter the axial and radial center holes of the main shaft 8 from the rear end of the main shaft 8 through the gap between the inner rotor 10 and the isolation sleeve 3 to reach the cavity where the bearing is located, and finally flow to the impeller 9 through the gap of the first bearing 12; the medium can also enter the cavity where the bearing is located from the cavity where the inner rotor 10 is located through the gap of the second bearing 13, and then flow to the impeller 9 through the gap of the first bearing 12.

It should be noted that the purpose of the flow path design of the above-mentioned small part of the supercritical CO2 liquid flow is: 1. to take away the heat generated by the inner rotor and the isolation sleeve to protect the inner rotor from demagnetization; 2. to take away the friction heat of the bearing and lubricate the bearing at the same time to protect the bearing from normal operation and damage.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims (6)

1. A supercritical carbon dioxide anhydrous dyeing circulation pump, comprising: the device comprises an external sealing mechanism, a rotating assembly arranged inside the external sealing mechanism, a rotating piece 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 piece outside the external sealing mechanism is positioned between the external sealing mechanism and the power device mechanism;

The rotary component inside the external sealing mechanism comprises: the main shaft is positioned in the center of the cavity of the external sealing mechanism, the front end of the main shaft is connected with an impeller through a key, the rear end of the main shaft is connected with an inner rotor through a key, and the impeller and the inner rotor are respectively connected in series through two ends of the main shaft and are respectively fixed on the main shaft through shaft head bolts; a bearing group is arranged at the rear end of the impeller and between the pump body and the main shaft; the bearing sets are two sets of bearings and are respectively positioned at shaft shoulders at two ends of the main shaft; the bearing near the direction of the impeller is called a first bearing, and the bearing near the direction of the inner rotor is called a second bearing; the two bearings are ceramic ball bearings.

2. The supercritical carbon dioxide anhydrous dyeing circulation pump of claim 1, wherein: the external sealing mechanism comprises: the device comprises a pump cover, a pump body, a spacer bush, an inlet flange positioned at the front end of the pump cover, an outlet flange positioned at the upper part of the pump body, a sealing ring and bolts; the inlet flange is connected with the front end of the pump cover through bolts and is sealed through a ring-shaped sealing ring, the rear end of the pump cover is connected with the pump body through bolts and is sealed through a ring-shaped sealing ring between the pump cover and the pump body, the rear end of the pump body is connected with the isolation sleeve through bolts and is sealed through a ring-shaped sealing ring between the pump body and the sealing ring, the upper end of the pump body is provided with an outlet flange, and the outlet flange is connected with the pump body through bolts and is provided with a sealing ring in a ring manner between the outlet flange and the pump body.

3. A supercritical carbon dioxide anhydrous dyeing circulation pump according to claim 2 and characterized in that: the inlet flange, the pump cover, the pump body, the outlet flange and the isolation sleeve form a sealing cavity together through sealing rings and bolts at the respective positions, so that an external sealing mechanism is formed.

4. The supercritical carbon dioxide anhydrous dyeing circulation pump of claim 1, wherein: the power device mechanism comprises: the motor, the motor shaft, the connecting frame and the bolts; the rear end of the outer rotor is arranged on a motor shaft of the motor, a connecting frame is arranged between the motor and the pump body, the front end of the connecting frame is fixedly connected with the pump body through a bolt, and the rear end of the connecting frame is connected with the motor through a bolt; the bottom of the motor is fixed on the base through a motor bracket.

5. The supercritical carbon dioxide anhydrous dyeing circulation pump of claim 1, wherein: the pump body is provided with a liquid through hole, and the liquid through hole communicates the inner cavity of the pump body with the cavity of the inner rotor to form a passage.

6. The supercritical carbon dioxide anhydrous dyeing circulation pump of claim 1, wherein: the spindle is provided with an axial central hole and a radial central hole from the rear end to the front end, and the axial central hole and the radial central hole form a T-shaped arrangement; the radial center hole is arranged at the center position between the two sets of bearings, and two ends of the radial center hole are communicated with the cavities where the two sets of bearings are positioned; one end of the axial center hole is positioned at the tail end of the main shaft, the other end extends to and communicates with the radially central bore.