CN111350672A

CN111350672A - Double-medium conveying device

Info

Publication number: CN111350672A
Application number: CN202010182094.4A
Authority: CN
Inventors: 徐惠敏; 张玉良; 李泽坤; 蒋超燕; 沈铖锋; 李金富; 陈秀芹
Original assignee: Quzhou University
Current assignee: Quzhou University
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-06-30
Anticipated expiration: 2040-03-16
Also published as: CN111350672B

Abstract

The invention provides a double-medium conveying device, and belongs to the technical field of conveying pumps. The double-medium conveying device solves the problems that an existing double-medium conveying device is large in vibration and poor in stability during working. The double-medium conveying device comprises a rack, a power source, a transmission mechanism and two medium conveying mechanisms, wherein the power source and the two medium conveying mechanisms are fixedly arranged on the rack, the transmission mechanism comprises a driving bevel gear connected with an output shaft of the power source and two driven bevel gears respectively positioned on two sides of the driving bevel gear, the two medium conveying mechanisms are respectively positioned on two sides of the transmission mechanism, the two driven bevel gears are respectively connected with rotating shafts of the two medium conveying mechanisms, and a spring vibration damping mechanism is further arranged between the two medium conveying mechanisms, and two ends of the spring vibration damping mechanism are respectively abutted against the two medium conveying mechanisms. The invention enables the two medium conveying mechanisms to form dynamic balance through ingenious structural design, avoids the superposition of vibration between the two medium conveying mechanisms, and has more stable work and more accurate conveying proportion.

Description

Double-medium conveying device

Technical Field

The invention belongs to the technical field of conveying pumps, and relates to a medium conveying device, in particular to a double-medium conveying device.

Background

In various fields such as petrochemical industry, aerospace, food processing, water and sewage treatment, a transfer pump is widely used to transfer various fluid media.

In many cases, it is necessary to mix and stir two media together in the same vessel before use. Most of the conventional delivery pumps can not deliver two media simultaneously, so that most of the conventional delivery pumps employ two delivery mechanisms to deliver one medium separately like a double-fluid pump disclosed in the chinese patent application (application No. 201910014391.5). However, since the two conveying mechanisms are respectively driven by independent motors, the conveying rates of the two conveying mechanisms cannot achieve an accurate 1:1 ratio, and particularly, when one pump stops running due to a fault in the using process, the other pump still continues to run, so that the mixing ratio of media is inconsistent, and the production is greatly influenced. Moreover, two conveying mechanism set up on the frame side by side, and conveying mechanism's pivot is in high-speed running state, leads to the vibration on two conveying mechanism to form the stack, thereby appears rocking easily, influences the stability of suction in-process, causes the output flow unstable.

The Chinese patent application (application number: 200810163872.4) also discloses a single-shaft parallel centrifugal pump for simultaneously conveying double media, which adopts the structure that two cavities are arranged on a pump body, blades are arranged in the two cavities, and the two blades are coaxially connected through the same motor, so that two conveying mechanisms working synchronously are formed on the pump body. Although this centrifugal pump can guarantee the transport ratio precision of two kinds of media, however, because two conveying mechanism on this centrifugal pump all connect in same pivot to the vibration that leads to two conveying mechanism to produce can form the stack on pivot and the pump body, can lead to violent vibration equally, thereby influences the stability in the suction process.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a double-medium conveying device, which aims to solve the technical problems that: how to improve the stability of two medium conveyor during operation.

The purpose of the invention can be realized by the following technical scheme: the double-medium conveying device comprises a rack, a power source, a transmission mechanism and two medium conveying mechanisms, wherein the power source and the two medium conveying mechanisms are fixedly arranged on the rack, and the double-medium conveying device is characterized in that the transmission mechanism comprises a driving bevel gear connected with an output shaft of the power source and two driven bevel gears respectively positioned on two sides of the driving bevel gear and meshed with the driving bevel gear, the two medium conveying mechanisms are respectively positioned on two sides of the transmission mechanism, the two driven bevel gears are respectively connected with rotating shafts of the two medium conveying mechanisms, and a spring vibration reduction mechanism is further arranged between the two medium conveying mechanisms, and two ends of the spring vibration reduction mechanism are respectively abutted against the two medium conveying mechanisms.

This two medium conveyor's power supply is located between two medium conveying mechanism, and the power supply drives two medium conveying mechanism synchronous working simultaneously through the bevel gear transmission pair, makes two conveying mechanism's pivot rotational speed the same and rotation direction is opposite, has both guaranteed that the medium that two medium conveying mechanism carried forms 1: the proportion of 1 can guarantee again because of the dynamic balance that the pivot rotated to produce between two medium conveying mechanism, still sets up spring damping mechanism simultaneously between two medium conveying mechanism, avoids medium conveying mechanism to transmit the vibration that the during operation produced to another medium conveying mechanism on, makes and reaches axial force balance between two medium conveying mechanism's the pivot to the vibration formation stack that two medium conveying mechanism produced has been avoided and has been increased amplitude. Therefore, the double-medium conveying mechanism not only ensures the dynamic balance between the two medium conveying mechanisms, but also ensures the balance of the axial force, greatly reduces the vibration of the whole machine, ensures the work of the whole machine to be more stable, and avoids the fluctuation of the conveying efficiency of the two medium conveying mechanisms, thereby ensuring the matching precision of the media conveyed by the two medium conveying devices.

In the above dual-media conveying device, the rotating shafts of the two media conveying mechanisms are located on the same axis, and the output shaft of the power source is perpendicular to the rotating shafts of the two media conveying mechanisms. The power source and the two medium conveying mechanisms are symmetrically distributed, so that the integral dynamic balance and axial force balance are further ensured.

In foretell two medium conveyor, spring damping mechanism includes damping spring and two bearing side covers that are located the damping spring both ends respectively, two bearing side cover is connected to each other with adjacent medium conveyor is solid respectively and is coaxial with the pivot, bearing side cover all opens the arc recess with the damping spring one-to-one on damping spring's the terminal surface, damping spring's both ends all are connected with the spring holder, the outer end of spring holder has outside convex arc portion, arc portion supports with the inner wall of arc recess and leans on and can move the inner wall of arc recess relatively. The two medium conveying mechanisms are respectively provided with a bearing side cover, and the spring forms pre-tightening between the two bearing side covers. When the vibration between the two medium conveying mechanisms is not completely coaxial, the vibration reduction spring can move in the arc groove through the arc part of the spring seat to change the angle, so that the stress between the two medium conveying mechanisms is balanced, and the vibration reduction effect is ensured.

In the above double-medium conveying device, the number of the damping springs is two or more, and the damping springs are uniformly distributed at intervals along the circumferential direction of the rotating shaft. The damping spring is arranged around the rotating shaft, so that the axial stress balance between the two medium conveying mechanisms is further ensured.

In foretell two medium conveyor, the outside of spring damping mechanism still is equipped with the dustcoat that is used for sealing spring damping mechanism, the dustcoat is the tube-shape, the inner wall of dustcoat have a plurality of supplies damping spring embedding and with the groove of stepping down of damping spring one-to-one, the both ends of the groove diapire of stepping down all have outside convex guide part, all open the guide way that supplies the embedding of spring seat along damping spring's length direction on the guide part. The groove of stepping down on the dustcoat forms the position of stepping down to damping spring, and forms the location through the guide way of stepping down the inslot and the spring holder at damping spring both ends, guarantees complex stability.

In the above dual media conveying device, the cross section of the spring seat is circular, and the diameter of the guide groove is larger than that of the cross section of the spring seat. Therefore, the guide groove is slightly larger than the spring seat, so that the spring seat can move in the guide groove to a certain extent, and the influence of the guide groove on the self-balance of the vibration reduction spring is avoided.

In the above dual-media conveying device, the spring seat includes a seat body and a roller, one end of the spring seat has an insertion portion that is in insertion fit with the damping spring, the other end of the spring seat is provided with an installation groove, the roller is a roller or a ball, the roller is arranged in the installation groove in a rolling manner, and the roller partially protrudes out of the installation groove and forms the arc portion. The roller is used as the arc-shaped part, so that the relative sliding between the spring seat and the arc-shaped groove is smoother, and the self-balancing effect of the damping spring is further ensured.

In the double-medium conveying device, the clutch mechanisms are arranged between the driven bevel gear and the rotating shaft and comprise a first half clutch and a second half clutch, the first half clutch is fixedly connected with the driven bevel gear, and the second half clutch is connected with the rotating shaft through a guide flat key. Through setting up clutching mechanism, this two medium conveyor can reach the synchronous transport that realizes two mediums simultaneously, also can realize the transport of single medium, and it is more nimble convenient to use.

In the above-mentioned two medium conveyor, be equipped with in the pivot and be used for pushing away half clutch two and make the top that half clutch two and half clutch one interlock push away the spring, medium conveyor all includes the pump case and the pivot shell that the cover was located in the pivot and one end is connected with the pump case, still be equipped with on the pivot shell and be used for controlling the shift fork that half clutch two and half clutch one separated or were connected and be used for forming the stopper of location to the shift fork. The shifting fork is shifted to realize the connection and the separation of the clutch mechanism, and the pushing spring can ensure the stability of the connection of the first half clutch and the second half clutch.

In the above-mentioned double medium conveying device, the medium conveying mechanism is a horizontal centrifugal pump.

Compared with the prior art, the invention has the following advantages:

1. the invention adopts a power source to drive the two medium conveying mechanisms simultaneously through the bevel gear transmission pair, thereby not only ensuring the synchronous conveying of the two media, but also forming dynamic balance between the two medium conveying mechanisms and reducing vibration, and simultaneously avoiding the superposition of axial vibration by arranging the spring vibration reduction mechanism between the two medium conveying mechanisms, thereby greatly reducing the vibration of the whole machine, ensuring that the work of the invention is more stable and the conveying proportion of the two media is more accurate.

2. The spring vibration reduction mechanism adopts a self-balancing structure, so that the angle of the vibration reduction spring can be automatically adjusted according to the vibration stress direction between the two medium conveying mechanisms, and the vibration between the two medium conveying mechanisms can be better eliminated.

3. The invention can select two medium conveying mechanisms to work simultaneously or only one medium conveying mechanism to work according to the use requirement, and the use is more flexible.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a top view of the present invention with the outer cover hidden;

FIG. 3 is a side view of the present invention after the outer cover has been hidden;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2 (with the frame omitted);

FIG. 5 is a schematic structural view of a spring damper mechanism and a transmission mechanism;

FIG. 6 is a schematic illustration of the engagement of the spring damper mechanism and the transmission mechanism;

FIG. 7 is a schematic structural view of a damping spring and spring seat;

FIG. 8 is a schematic structural view of a load side cover;

FIG. 9 is a schematic view of an alternative spring seat construction;

FIG. 10 is a schematic view of the construction of the housing;

FIG. 11 is a schematic structural view of a clutch mechanism;

fig. 12 is a schematic view of the stopper structure.

In the figure, 1, a frame; 2. a power source; 3. a medium conveying mechanism; 31. a rotating shaft; 31a, a shoulder; 32. a pump housing; 33. a rotating shaft housing; 4. a transmission mechanism; 41. a drive bevel gear; 42. a driven bevel gear; 5. a spring damping mechanism; 51. a load-bearing side cover; 51a, an arc-shaped groove; 52. a damping spring; 53. a spring seat; 53a, an arc; 531. a base body; 532. a plug-in part; 533. a roller; 534. a pin shaft; 61. a housing; 61a, a half cover; 62. a yielding groove; 63. a guide portion; 64. a guide groove; 65. a supporting seat; 66. an end cap; 7. a clutch mechanism; 71. a first half clutch; 72. a second half clutch; 72a, a positioning groove; 73. a pushing spring; 8. a shifting fork; 81. a deflector rod; 82. an engaging portion; 9. a stopper; 91. a limiting stop lever; 92. a limiting spring; 10. an encoder.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1, a double-medium conveying device comprises a frame 1, a power source 2 and two medium conveying mechanisms 3, wherein the power source 2 is in transmission connection with the two medium conveying mechanisms 3 through a transmission mechanism 4 consisting of a driving bevel gear 41 and two driven bevel gears 42, and a spring damping mechanism 5 is further arranged between the two medium conveying mechanisms 3, so that the double-medium conveying device achieves dynamic balance and reduces vibration generated by work when in work.

Specifically, as shown in fig. 1 to 6, the power source 2 and the two medium conveying mechanisms 3 are both fixed to the frame 1, the transmission mechanism 4 includes a driving bevel gear 41 and two driven bevel gears 42, wherein the driving bevel gear 41 is fixedly connected to an output shaft of the power source 2, the two driven bevel gears 42 are respectively located on two sides of the driving bevel gear 41 and engaged with the driving bevel gear 41, the two medium conveying mechanisms 3 have the same structure and are respectively located on two sides of the transmission mechanism 4, and the two driven bevel gears 42 are respectively connected to the rotating shafts 31 of the two medium conveying mechanisms 3. In this embodiment, the output shaft of the power source 2 is arranged along the longitudinal direction of the rack 1, the rotating shafts 31 of the two medium conveying mechanisms 3 are both arranged along the transverse direction of the rack 1, and the two rotating shafts 31 are located on the same axis, so that the output shaft of the power source 2 is perpendicular to the rotating shafts 31 of the two medium conveying mechanisms 3, and thus the power source 2 can simultaneously drive the rotating shafts 31 of the two medium conveying mechanisms 3 to synchronously rotate, and the rotating directions of the two rotating shafts 31 are opposite, so that dynamic balance between the two rotating shafts 31 is achieved.

In the present embodiment, the power source 2 is not limited to a motor, and other power devices capable of outputting torque, such as a gasoline engine or an engine, may be used. The medium conveying mechanism 3 can adopt equipment such as a centrifugal pump, a screw pump, a mixed flow pump and the like, and the medium conveying mechanism 3 is a horizontal centrifugal pump in the embodiment.

Further, as shown in fig. 5, an encoder 10 is further provided right in front of the drive bevel gear 41 for monitoring the rotational speed of the drive bevel gear 41 in real time.

As shown in fig. 3, 4, 6, 7 and 8, the spring damping mechanism 5 is disposed between two medium conveying mechanisms 3, each medium conveying mechanism 3 includes a pump housing 32, a rotating shaft 31 and a rotating shaft housing 33, the rotating shaft 31 is rotatably disposed in the pump housing 32, one end of the rotating shaft extends out of the pump housing 32, the rotating shaft housing 33 is sleeved on one end of the rotating shaft 31 extending out of the pump housing 32 and is fixedly connected with the pump housing 32, and the rotating shaft housing 33 is rotatably connected with the rotating shaft 31 through a bearing. The spring damping mechanism 5 comprises two bearing side covers 51 arranged at intervals and a damping spring 52 located between the bearing side covers 51, the bearing side covers 51 are in an annular disc shape, the two bearing side covers 51 are respectively fixedly connected with the adjacent medium conveying mechanisms 3 and coaxial with the rotating shaft 31, the transmission mechanism 4 is also located between the two bearing side covers 51, arc-shaped grooves 51a corresponding to the damping springs 52 one by one are formed in the end faces, facing the damping spring 52, of the bearing side covers 51, spring seats 53 are connected to the two ends of the damping spring 52, the spring seats 53 are embedded into the arc-shaped grooves 51a, arc-shaped portions 53a protruding outwards and abutting against the inner wall of the spring seats 53 are formed in the outer ends of the spring seats 53, the diameters of the arc-shaped grooves 51a are larger than those of the arc-shaped portions 53a, and the arc-shaped portions 53a can move in the arc. In this embodiment, the arc portion 53a and the spring seat 53 are of an integral structure. After the installation, damping spring 52 is in the pressurized pretension state, make the arc portion 53a of spring holder 53 support with arc recess 51a respectively and lean on, when the vibration atress between two medium conveying mechanism 3 was not located the axis of pivot 31, arc portion 53a can change position and angle in arc recess 51a according to the atress, thereby make damping spring 52 angle of adjustment, the length direction of damping spring 52 is unanimous with the vibration direction between two medium conveying mechanism 3, realize the axial force self-balancing between two medium conveying mechanism 3, in order to reach best damping effect.

Further, the number of the damping springs 52 may be two or more, and the damping springs 52 are uniformly spaced along the circumferential direction of the rotating shaft 31 to improve the damping effect. In this embodiment, two damping springs 52 are disposed above and below the rotating shaft 31.

As shown in fig. 1 and 5, an outer cover 61 is further disposed outside the spring damping mechanism 5, the outer cover 61 is fixedly connected to the frame 1 through a support seat 65 disposed below the outer cover 61, the outer cover 61 includes two half covers 61a disposed up and down, the two half covers 61a surround to form a cylinder shape and enclose the spring damping mechanism 5 and the transmission mechanism 4, the outer cover 61 is disposed along the axial direction of the rotating shaft 31, the two bearing side covers 51 are respectively located at two ends of the outer cover 61, and no fixed structure is disposed between the two bearing side covers 51 and the outer cover 61, so that the bearing side covers 51 can move relative to the outer cover 61 during vibration, and vibration transmission between the two medium conveying mechanisms 3 through the outer cover 61 is avoided. Furthermore, end covers 66 positioned at the outer sides of the adjacent bearing side covers 51 are fixedly arranged at the two ends of the outer cover 61.

As shown in fig. 10, the inner wall of the half cover 61a has a recess 62 into which the damper spring 52 is inserted and corresponding to the damper spring 52 one by one, both ends of the bottom wall of the recess 62 have outwardly protruding guide portions 63, and the guide portions 63 have guide grooves 64 slidably engaged with the spring seats 53 along the length direction of the damper spring 52. The cross section of the spring seat 53 is circular, the cross section of the guide groove 64 is also arc-shaped, and the diameter of the guide groove 64 is slightly larger than that of the cross section of the spring seat 53, so that the guide groove 64 can play a certain guiding role when the spring seat 53 vibrates, and can avoid interference on self-balance of the damping spring 52.

The bottom wall of the relief groove 62 may be formed integrally with the half shell or may be formed separately from the half shell, so that the damping spring 52 and the spring seat 53 can be easily mounted.

As shown in fig. 4, 11 and 12, a clutch mechanism 7 is provided between the rotating shaft 31 and the driven bevel gear 42 of the two medium conveying mechanisms 3 to facilitate the switching between the double medium conveying and single medium conveying modes of the present invention. In this embodiment, the clutch mechanism 7 is a jaw clutch, and includes a first half clutch 71 and a second half clutch 72, where the first half clutch 71 is fixedly connected to the driven bevel gear 42, and the second half clutch 72 is connected to the rotating shaft 31 through a guide flat key. The rotating shaft 31 is sleeved with a pushing spring 73, one end of the pushing spring 73 is abutted against the shoulder 31a on the rotating shaft 31, and the other end of the pushing spring 73 is abutted against the second half clutch 72, so that the pushing spring 73 can push the second half clutch 72 to be meshed with the first half clutch 71, and the meshing stability of the clutch mechanism 7 is ensured. Meanwhile, the rotating shaft shell 33 is further hinged with a shifting fork 8, the shifting fork 8 comprises a shifting rod 81 and an engagement part 82, the engagement part 82 is located below the shifting rod 81, a positioning groove 72a which is annularly arranged along the circumferential direction is formed in the second half clutch 72, and after the engagement part 82 of the shifting fork 8 is engaged with the positioning groove 72a, the second half clutch 72 can be driven to slide along the axial direction by shifting the shifting fork 8, so that the clutch of the clutch mechanism 7 is realized. In order to realize the positioning of the shifting fork 8, the rotating shaft shell 33 is further provided with a limiting stopper 9, the limiting stopper 9 comprises two limiting stopper rods 91 and two limiting springs 92, the two limiting stopper rods 91 are respectively hinged at two sides of the shifting rod 81 and positioned above the hinged point of the shifting fork 8, two ends of the two limiting springs 92 are respectively connected with the limiting stopper rods 91 and the rotating shaft shell 33, the front ends of the two limiting stopper rods 91 are in a mutually close state and positioned in front of the moving direction of the shifting rod 81 so as to seal the moving path of the shifting rod 81, when the shifting fork 8 swings and controls the second half clutch 72 to be separated from the first half clutch 71, the shifting fork 8 overcomes the thrust of the limiting springs 92 and drives the two limiting stopper rods 91 to swing so as to open the moving path, when the shifting fork 8 is positioned at the rear position of the separation clutch mechanism 7, the two limiting stopper rods 91 close the moving path again under the action of the, the second half clutch 72 is prevented from being reset under the action of the thrust spring. Similarly, when the clutch mechanism 7 is engaged, only the shifting fork 8 needs to be shifted to overcome the pulling force of the limiting spring 92 on the limiting stop lever 91, and the operation is simple and convenient.

Example two

As shown in fig. 9, the present embodiment is substantially the same as the first embodiment, except that in the present embodiment, the spring seat 53 is a split structure, and includes a seat body 531 and a roller 533, one end of the spring seat 53 has an insertion portion 532 engaged with the damping spring 52, the other end of the spring seat 53 is provided with a mounting groove, the roller 533 is arranged in the mounting groove in a rolling manner, and a portion of the roller 533 protrudes out of the mounting groove and forms the arc-shaped portion 53a, so that the spring seat 53 moves symmetrically with the arc-shaped groove 51 a. In this embodiment, the rollers 533 are rollers and are installed in the installation groove through the pin 534, but the rollers 533 may also be balls.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms frame 1, power source 2, medium transport mechanism 3, spring damping mechanism 5, clutch mechanism 7, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A double-medium conveying device comprises a frame (1), a power source (2), a transmission mechanism (4) and two medium conveying mechanisms (3), the power source (2) and the two medium conveying mechanisms (3) are fixedly arranged on the frame (1), the medium conveying mechanism is characterized in that the transmission mechanism (4) comprises a driving bevel gear (41) connected with an output shaft of the power source (2) and two driven bevel gears (42) respectively positioned on two sides of the driving bevel gear (41) and meshed with the driving bevel gear (41), the two medium conveying mechanisms (3) are respectively positioned on two sides of the transmission mechanism (4), the two driven bevel gears (42) are respectively connected with rotating shafts (31) of the two medium conveying mechanisms (3), and spring damping mechanisms (5) with two ends respectively abutted against the two medium conveying mechanisms (3) are further arranged between the two medium conveying mechanisms (3).

2. The dual media feeding device according to claim 1, wherein the rotation shafts (31) of the two media feeding mechanisms (3) are located on the same axis, and the output shaft of the power source (2) is perpendicular to the rotation shafts (31) of the two media feeding mechanisms.

3. The double media conveying device according to claim 2, wherein the spring damping mechanism (5) comprises a damping spring (52) and two bearing side covers (51) respectively located at two ends of the damping spring (52), the two bearing side covers (51) are respectively fixed with the adjacent media conveying mechanisms (3) and coaxial with the rotating shaft (31), arc-shaped grooves (51a) corresponding to the damping spring (52) in a one-to-one manner are formed in end faces of the bearing side covers (51) facing the damping spring (52), spring seats (53) are connected to two ends of the damping spring (52), an arc-shaped portion (53a) protruding outwards is arranged at the outer end of each spring seat (53), and the arc-shaped portions (53a) abut against inner walls of the arc-shaped grooves (51a) and can move relative to the inner walls of the arc-shaped grooves (51 a).

4. The double media conveying device according to claim 3, wherein the number of the damping springs (52) is two or more, and the damping springs (52) are uniformly distributed at intervals in the circumferential direction of the rotating shaft (31).

5. The double-medium conveying device according to claim 3 or 4, wherein an outer cover (61) for closing the spring damping mechanism (5) is further arranged on the outer side of the spring damping mechanism (5), the outer cover (61) is cylindrical, a plurality of yielding grooves (62) for embedding the spring damping springs (52) and corresponding to the spring damping springs (52) in a one-to-one mode are formed in the inner wall of the outer cover (61), outwards-protruding guide portions (63) are arranged at two ends of the bottom wall of each yielding groove (62), and guide grooves (64) in sliding fit with the spring seats (53) are formed in each guide portion (63) along the length direction of the spring damping springs (52).

6. The dual media transport device of claim 5, wherein the spring seat (53) is circular in cross-section, the guide groove (64) is also arcuate in cross-section, and the diameter of the guide groove (64) is greater than the diameter of the spring seat (53) in cross-section.

7. The dual media conveying device according to claim 6, wherein the spring seat (53) comprises a seat body (531) and a roller (533), one end of the spring seat (53) has an insertion portion (532) for insertion and engagement with the damping spring (52), the other end of the spring seat (53) is provided with a mounting groove, the roller (533) is a roller or a ball, the roller (533) is arranged in the mounting groove in a rolling manner, and the roller (533) partially protrudes from the mounting groove and forms the arc-shaped portion (53 a).

8. The double-medium conveying device according to claim 1, 2 or 3, wherein a clutch mechanism (7) is arranged between the driven bevel gear (42) and the rotating shaft (31), the clutch mechanism (7) comprises a first half clutch (71) and a second half clutch (72), the first half clutch (71) is fixedly connected with the driven bevel gear (42), and the second half clutch (72) is connected with the rotating shaft (31) through a guide flat key.

9. The double-medium conveying device according to claim 8, wherein the rotating shaft (31) is provided with a pushing spring (73) for pushing the second half clutch (72) and engaging the second half clutch (72) with the first half clutch (71), each medium conveying mechanism (3) comprises a pump shell (32) and a rotating shaft shell (33) sleeved on the rotating shaft (31) and having one end connected with the pump shell (32), and the rotating shaft shell (33) is further provided with a shifting fork (8) for controlling the separation or connection of the second half clutch (72) and the first half clutch (71) and a stopper (9) for positioning the shifting fork (8).

10. Double medium conveying device according to claim 1 or 2 or 3, characterized in that the medium conveying means (3) is a horizontal centrifugal pump.