Energy-saving centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, in particular to an energy-saving centrifugal pump which comprises a mounting seat, a pump shell fixedly connected to the mounting seat, a heating impeller arranged in the pump shell, a protective seat fixedly connected to the mounting seat, a motor fixedly connected to the interior of the protective seat, and a heat conduction pipe set arranged on the outer side of the motor. A heat conduction pipe set is arranged on the pump shell, a cleaning mechanism is arranged on the heat conduction pipe set in a sliding fit mode, a top cover is arranged on the protection base, and by arranging the heat conduction pipe set, in the using process of the centrifugal pump, a medium in the heat conduction pipe set collects heat generated by the motor, and the rotating heating impeller can suck the heated medium to the heating impeller and the inner wall of the inlet end of the pump shell; therefore, the conveyed oil liquid is heated. The waste heat is utilized, extra energy consumption is not needed to heat oil, and the overall utilization efficiency of energy is effectively improved. And the viscosity of the heated oil liquid is reduced, and the fluidity is enhanced, so that the power consumption when the centrifugal pump conveys the high-viscosity oil liquid is reduced, and the working efficiency of the pump is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and in particular to an energy-saving centrifugal pump. Background Art

[0002] A centrifugal pump is a fluid machine that uses centrifugal force to convert mechanical energy into kinetic and pressure energy. It is widely used in industries such as water pumps, chemicals, petroleum, metallurgy, pharmaceuticals, and food, and is particularly suitable for transporting a variety of liquids, including clean water, sewage, and chemical liquids.

[0003] The prior art document CN117329132A provides a centrifugal pump. Through a novel structural design, the impeller's rotation speed is accelerated while the motor's speed remains unchanged, increasing the pump's operating speed. This ensures the pump's flow rate and head, reduces energy consumption, and improves the pump's operating efficiency. When the motor drives the centrifugal pump's shaft and impeller to rotate, the impeller's blades drive the liquid to rotate together, generating centrifugal force. Under the action of the centrifugal force, the liquid in the impeller is flung along the blade flow path toward the outer edge of the impeller and into the pump chamber. At this time, the liquid generates a viscous force as it flows through the surfaces of multiple rotating discs behind the impeller. The viscous force of the liquid drives the discs to rotate, accelerating their rotation. While the motor's speed remains unchanged, the impeller's rotation speed is accelerated, increasing the pump's operating speed. This ensures the pump's flow rate and head, reduces energy consumption, and improves the pump's operating efficiency. Furthermore, no additional equipment or device is required to adjust the pump's operating speed, achieving the goal of improving the pump's operating efficiency and thus reducing costs.

[0004] However, in practical applications, when pumping oil, due to its high viscosity, the high-viscosity oil will adhere to the impeller, causing greater friction between the pump body and the impeller, resulting in reduced pump efficiency. To overcome the high resistance of viscous liquids, centrifugal pumps generally require higher power input, resulting in increased energy consumption.

[0005] In summary, the prior art lacks a technology for using heating to transport oil using a centrifugal pump. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an energy-saving centrifugal pump.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: an energy-saving centrifugal pump, comprising a mounting seat, a pump casing fixedly connected to the mounting seat, a heating impeller arranged inside the pump casing, a protective seat fixedly connected to the mounting seat, a motor fixedly connected inside the protective seat, a heat conduction pipe group arranged on the outside of the motor, a cleaning mechanism slidably provided on the heat conduction pipe group, and a top cover provided on the protective seat.

[0008] Preferably, a heating groove is provided on the inner wall of one end of the water inlet of the pump casing, a hollow disk is fixedly connected to the outer wall of one end of the water inlet of the pump casing, a guide tube is fixedly connected through one side of the hollow disk, and the other end of the guide tube is fixedly connected through the inner wall of the heating groove.

[0009] Preferably, a hollow shaft is fixedly connected to the middle of the heating impeller, a suction pipe is fixedly connected through the inner wall of one end of the hollow shaft, the suction pipe is arranged in an L-shaped structure, the other end of the suction pipe passes through the inner wall of the pump casing and extends into the hollow disk, one end of the hollow shaft passes through the inner wall of the pump casing and extends to the outside and is fixedly connected with a shaft sleeve, the shaft sleeve is slidingly fitted with the output end of the motor, a guide ring is rotatably connected to the outer wall of the outer end of the hollow shaft, and a plurality of guide holes are opened through the outer wall of the hollow shaft located in the guide ring.

[0010] Preferably, a fixed rack is fixedly connected to an outer wall of one side of the protective seat, and a wave-shaped guide frame is fixedly connected to an inner wall of the bottom end of the protective seat, and a guide groove is provided on the wave-shaped guide frame.

[0011] Preferably, both ends of the heat-conducting pipe group extend through the inner wall of the protective seat to the outside, and the two ends of the heat-conducting pipe group are respectively fixedly connected to the heating groove and the inner wall of the guide ring. The heat-conducting pipe group is arranged in an annular structure on the outside of the motor, and the outer walls of the two ends of the heat-conducting pipe group located on the outside are both covered with insulation sleeves.

[0012] Preferably, the cleaning mechanism includes an arc-shaped frame, a plurality of cleaning sleeves are rotatably connected to the arc-shaped frame, the inner wall of the cleaning sleeve is in sliding contact with the outer wall of the heat conduction tube group, a transmission wheel is fixedly connected to the outer wall of the cleaning sleeve, a limit bar is fixedly connected to the outer wall of the arc-shaped frame, an adjustment frame is slidably matched with the outer wall of the limit bar, an arc-shaped rack is fixedly connected to the adjustment frame, and the arc-shaped rack is meshed with a plurality of transmission wheels for transmission.

[0013] Preferably, a limit block is fixedly connected to one side of the bottom end of the arc frame, a guide rod is slidingly provided on the limit block, one end of the guide rod is slidingly fitted with the inner wall of the guide groove, the other end of the guide rod is fixedly connected to a connecting rod, the other end of the connecting rod is rotatably connected to the adjustment frame, and a transmission push rod is fixedly connected to one side of the limit block.

[0014] Preferably, an electric push rod is fixedly connected to one side of the top cover, the other end of the electric push rod is fixedly connected to the inner wall of the protective seat, an inclined frame is fixedly connected to the lower surface of the top cover, the inner wall of the inclined frame is slidingly matched with the outer wall of the bottom end of the transmission push rod, and side panels are rotatably connected on both sides of the top cover.

[0015] Preferably, a worm is provided in a rotatable connection through the inner wall of one side of the top cover, an adjusting wheel is fixedly connected to the outer end of the worm, the adjusting wheel is meshed with a fixed rack for transmission, a worm wheel is meshed with the inner end of the worm for transmission, a universal joint group is fixedly provided on the worm wheel, and both ends of the universal joint group are fixedly connected to one end of the two side plates respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By installing a heat pipe assembly, the medium within the heat pipe assembly collects heat generated by the motor during operation. The rotating heating impeller draws the heated medium toward the impeller and the inner wall of the pump casing inlet, thereby heating the pumped oil. This waste heat is utilized, eliminating the need for additional energy to heat the oil, effectively improving overall energy efficiency. The heated oil's viscosity decreases, enhancing its fluidity. This reduces the power consumption of the centrifugal pump when conveying high-viscosity oils, thereby improving pump efficiency.

[0017] 2. A cleaning mechanism is installed. When the top cover is opened and closed, the cleaning mechanism moves. Under the action of the wavy guide frame, the cleaning sleeve reciprocates to clean the outer wall of the heat pipe assembly, effectively removing accumulated dirt and sediment on the surface and reducing heat conduction efficiency loss. Keeping the heat pipe assembly clean not only improves heat exchange efficiency, but also reduces corrosion and wear caused by dirt and impurities accumulation, thereby extending the service life of the heat pipe assembly.

[0018] 3. The adjustable top cover and side panels protect the motor when the temperature is moderate, optimizing heat conduction and insulation while preventing dust accumulation. When the temperature is too high, effective heat dissipation is achieved. This not only improves the stability, performance, and energy efficiency of the equipment, extending its service life, but also reduces maintenance costs and manual intervention, giving the device a higher level of automation and intelligence, and enhancing its energy-saving and environmental advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an energy-saving centrifugal pump of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of a pump casing structure of an energy-saving centrifugal pump of the present invention; Figure 3 This is a partial cross-sectional schematic diagram of a heating impeller structure of an energy-saving centrifugal pump of the present invention; Figure 4 This is a schematic structural diagram of a protective seat of an energy-saving centrifugal pump according to the present invention; Figure 5 This is a schematic structural diagram of a heat transfer pipe group of an energy-saving centrifugal pump of the present invention; Figure 6This is a schematic structural diagram of a cleaning mechanism of an energy-saving centrifugal pump of the present invention; Figure 7 It is a partial cross-sectional schematic diagram of a top cover structure of an energy-saving centrifugal pump of the present invention; Figure 8 The present invention is an energy-saving centrifugal pump Figure 7 A magnified schematic diagram of the structure in the middle.

[0020] The following are marked in the figure: 1. Mounting seat; 2. Pump casing; 3. Heating impeller; 4. Protective seat; 5. Motor; 6. Heat pipe assembly; 7. Cleaning mechanism; 8. Top cover; 201. Heating tank; 202. Hollow plate; 203. Flow guide pipe; 301. Hollow shaft; 302. Suction pipe; 303. Bushing; 304. Flow guide ring; 305. Flow guide hole; 401. Fixed rack; 402. Wave-shaped guide frame; 40 3. Guide groove; 701. Arc frame; 702. Cleaning sleeve; 703. Transmission wheel; 704. Limiting strip; 705. Adjusting frame; 706. Arc rack; 707. Limiting block; 708. Guide rod; 709. Connecting rod; 710. Transmission push rod; 801. Electric push rod; 802. Bevel frame; 803. Side plate; 804. Worm; 805. Adjusting wheel; 806. Worm gear; 807. Universal joint assembly. DETAILED DESCRIPTION

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0022] like Figures 1-8 An energy-saving centrifugal pump shown includes a mounting base 1, a pump casing 2 is fixedly connected to the mounting base 1, a heating impeller 3 is provided in the pump casing 2, a protective base 4 is fixedly connected to the mounting base 1, a motor 5 is fixedly connected in the protective base 4, a heat conduction pipe group 6 is provided on the outside of the motor 5, a cleaning mechanism 7 is slidably provided on the heat conduction pipe group 6, and a top cover 8 is provided on the protective base 4.

[0023] like Figure 2 As shown, a heating groove 201 is provided on the inner wall of one end of the water inlet of the pump casing 2, and a hollow disk 202 is fixedly connected to the outer wall of one end of the water inlet of the pump casing 2. A guide tube 203 is fixedly connected to one side of the hollow disk 202, and the other end of the guide tube 203 is fixedly connected to the inner wall of the heating groove 201.

[0024] like Figure 3As shown, a hollow shaft 301 is fixedly connected to the middle of the heating impeller 3, and a suction pipe 302 is fixedly connected to the inner wall of one end of the hollow shaft 301. The suction pipe 302 is arranged in an L-shaped structure, and the other end of the suction pipe 302 passes through the inner wall of the pump casing 2 and extends to the hollow disk 202. One end of the hollow shaft 301 passes through the inner wall of the pump casing 2 and extends to the outside and is fixedly connected to a shaft sleeve 303. The shaft sleeve 303 is slidingly matched with the output end of the motor 5. A guide ring 304 is rotatably connected to the outer wall of the outer end of the hollow shaft 301, and a plurality of guide holes 305 are opened through the outer wall of the hollow shaft 301 located in the guide ring 304. When the hollow shaft 301 rotates, the connected suction pipe 302 will be driven to rotate. Since the suction pipe 302 is arranged in an L-shaped structure, when the suction pipe 302 rotates, the heated medium in the heat conduction pipe group 6 is sucked into the guide ring 304, and then enters the hollow shaft 301 through the guide hole 305, thereby heating the hollow shaft 301 and the connected heating impeller 3, so that the heating impeller 3 heats the oil in contact with it. At the same time, the medium discharged from the suction pipe 302 will be injected into the inner wall of the water inlet of the pump housing 2 through the guide pipe 203 on the hollow disk 202.

[0025] like Figure 4 As shown, a fixed rack 401 is fixedly connected to the outer wall of one side of the protective seat 4, and a wave-shaped guide frame 402 is fixedly connected to the inner wall of the bottom end of the protective seat 4. A guide groove 403 is opened on the wave-shaped guide frame 402.

[0026] like Figure 5 As shown, both ends of the heat pipe group 6 pass through the inner wall of the protective seat 4 and extend to the outside. The two ends of the heat pipe group 6 are respectively fixedly connected to the inner wall of the heating groove 201 and the guide ring 304. The heat pipe group 6 is arranged in a ring structure on the outside of the motor 5, and the outer walls of the two ends of the heat pipe group 6 are both covered with insulation sleeves.

[0027] By providing heat pipe assembly 6, during operation of the centrifugal pump, the medium within heat pipe assembly 6 collects heat generated by motor 5. The rotating heating impeller 3 draws the heated medium toward the impeller 3 and the inner wall of the inlet end of the pump casing 2, thereby heating the conveyed oil. Utilizing this waste heat eliminates the need for additional energy consumption to heat the oil, effectively improving overall energy efficiency. The heated oil reduces viscosity and enhances fluidity, thereby reducing the power consumption of the centrifugal pump when conveying high-viscosity oil and improving pump efficiency.

[0028] like Figure 6As shown, the cleaning mechanism 7 includes an arc-shaped frame 701, on which a plurality of cleaning sleeves 702 are rotatably connected. The inner wall of the cleaning sleeve 702 is in sliding contact with the outer wall of the heat-conducting tube group 6. A transmission wheel 703 is fixedly connected to the outer wall of the cleaning sleeve 702. A limit bar 704 is fixedly connected to the outer wall of the arc-shaped frame 701. An adjustment frame 705 is slidably provided on the outer wall of the limit bar 704. An arc-shaped rack 706 is fixedly connected to the adjustment frame 705. The arc-shaped rack 706 is meshed with the plurality of transmission wheels 703. The adjustment frame 705 is driven to rotate back and forth by a connecting rod 709, so that the arc-shaped rack 706 on the adjustment frame 705 can drive the cleaning sleeve 702 connected to the transmission wheel 703 to rotate, thereby cleaning the outer wall of the heat-conducting tube group 6.

[0029] A limit block 707 is fixedly connected to one side of the bottom end of the arc frame 701. A guide rod 708 is slidably mounted on the limit block 707. One end of the guide rod 708 is slidably mounted in the inner wall of the guide groove 403. The other end of the guide rod 708 is fixedly connected to a connecting rod 709. The other end of the connecting rod 709 is rotatably connected to the adjustment frame 705. A transmission push rod 710 is fixedly connected to one side of the limit block 707. When the top cover 8 moves upward, the transmission push rod 710 is driven by the connected inclined frame 802, so that the transmission push rod 710 drives the arc frame 701 connected to the limit block 707 to move. At this time, under the action of the guide groove 403 on the wave-shaped guide frame 402, the guide rod 708 can be driven to move back and forth.

[0030] like Figure 7 、 Figure 8 As shown, an electric push rod 801 is fixedly connected to one side of the top cover 8, and the other end of the electric push rod 801 is fixedly connected to the inner wall of the protective seat 4. An inclined frame 802 is fixedly connected to the lower surface of the top cover 8, and the inner wall of the inclined frame 802 is slidingly matched with the outer wall of the bottom end of the transmission push rod 710. Side panels 803 are rotatably connected on both sides of the top cover 8.

[0031] A worm 804 is provided on the inner wall of one side of the top cover 8 for rotational connection. An adjusting wheel 805 is fixedly connected to the outer end of the worm 804. The adjusting wheel 805 is meshed with the fixed rack 401 for transmission. A worm wheel 806 is provided on the inner end of the worm 804 for transmission. A universal joint assembly 807 is fixedly provided on the worm wheel 806. The ends of the universal joint assembly 807 are respectively fixedly connected to one end of the two side panels 803. When the electric push rod 801 is used to drive the connected top cover 8 upward, the adjusting wheel 805 will mesh with the fixed rack 401, thereby driving the worm 804 connected to the adjusting wheel 805 to rotate, so that the worm 804 can drive the universal joint assembly 807 connected to the worm wheel 806 to rotate, so that the universal joint assembly 807 drives the connected side panels 803 to rotate and open.

[0032] Working principle: When oil needs to be transported, the motor 5 is first used to drive the sleeve 303 to rotate, so that the sleeve 303 drives the connected hollow shaft 301 to rotate, so that the hollow shaft 301 drives the heating impeller 3, thereby sucking the oil into the pump casing 2 and transporting it to other locations through the pump casing 2. At this time, the motor 5 will generate heat, and the heat will heat the medium in the heat pipe group 6; As hollow shaft 301 rotates, it drives the connected suction tube 302. Due to its L-shaped structure, the fluid within the tube is subject to centrifugal force. According to the principles of fluid dynamics, a rotating object causes the fluid to move away from the center of rotation, creating a pressure differential. Between the two ends of suction tube 302, this centrifugal force "pushes" the fluid out at one end, while creating a low-pressure area at the other end. This low-pressure area can promote the suction force of the suction pipe 302, thereby sucking the heated medium in the heat pipe group 6 into the guide ring 304, and then entering the hollow shaft 301 through the guide hole 305, thereby heating the hollow shaft 301 and the connected heating impeller 3, so that the heating impeller 3 heats the oil in contact with it. At the same time, the medium discharged from the suction pipe 302 will be injected into the inner wall of the water inlet of the pump housing 2 through the guide pipe 203 on the hollow disk 202, thereby heating the drawn-in oil. When the motor 5 is detected to be overheated, the electric push rod 801 is used to drive the connected top cover 8 to move upward. At this time, the adjusting wheel 805 will engage with the fixed rack 401, thereby driving the worm 804 connected to the adjusting wheel 805 to rotate, so that the worm 804 can drive the universal joint assembly 807 connected to the worm wheel 806 to rotate, so that the universal joint assembly 807 drives the connected side plate 803 to rotate and open, so that the motor 5 is exposed to the outside, thereby improving the heat dissipation effect; At the same time, when the top cover 8 moves up, the transmission push rod 710 will be driven to move through the connected inclined frame 802, so that the transmission push rod 710 drives the arc frame 701 connected to the limit block 707 to move. At this time, under the action of the guide groove 403 on the wavy guide frame 402, the guide rod 708 can be driven to move back and forth, so that the guide rod 708 can drive the adjustment frame 705 to rotate back and forth through the connecting rod 709, so that the arc rack 706 on the adjustment frame 705 can drive the cleaning sleeve 702 connected to the transmission wheel 703 to rotate, thereby cleaning the outer wall of the heat conduction pipe group 6 to ensure its thermal conductivity.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving centrifugal pump, comprising a mounting base (1), characterized in that: A pump casing (2) is fixedly connected to the mounting seat (1), a heating impeller (3) is arranged inside the pump casing (2), a protective seat (4) is fixedly connected to the mounting seat (1), a motor (5) is fixedly connected inside the protective seat (4), a heat conduction pipe group (6) is arranged outside the motor (5), a cleaning mechanism (7) is slidably provided on the heat conduction pipe group (6), and a top cover (8) is provided on the protective seat (4).

2. An energy-saving centrifugal pump according to claim 1, characterized in that: A heating groove (201) is provided on the inner wall of one end of the water inlet of the pump housing (2), and a hollow disk (202) is fixedly connected to the outer wall of one end of the water inlet of the pump housing (2). A flow guide tube (203) is fixedly connected and penetrated through one side of the hollow disk (202), and the other end of the flow guide tube (203) is fixedly connected and penetrated through the inner wall of the heating groove (201).

3. An energy-saving centrifugal pump according to claim 2, characterized in that: A hollow shaft (301) is fixedly connected to the middle of the heating impeller (3), and a suction pipe (302) is fixedly connected and provided through the inner wall of one end of the hollow shaft (301), and the suction pipe (302) is arranged in an L-shaped structure. The other end of the suction pipe (302) passes through the inner wall of the pump casing (2) and extends into the hollow disk (202). One end of the hollow shaft (301) passes through the inner wall of the pump casing (2) and extends to the outside and is fixedly connected and provided with a shaft sleeve (303), and the shaft sleeve (303) is slidingly matched with the output end of the motor (5). A guide ring (304) is rotatably connected to the outer wall of the outer end of the hollow shaft (301), and a plurality of guide holes (305) are opened through the outer wall of the hollow shaft (301) located inside the guide ring (304).

4. An energy-saving centrifugal pump according to claim 3, characterized in that: A fixed rack (401) is fixedly connected to the outer wall of one side of the protection seat (4), and a wavy guide frame (402) is fixedly connected to the inner wall of the bottom end of the protection seat (4). A guide groove (403) is provided on the wavy guide frame (402).

5. An energy-saving centrifugal pump according to claim 4, characterized in that: Both ends of the heat-conducting pipe group (6) extend through the inner wall of the protective seat (4) to the outside, and the two ends of the heat-conducting pipe group (6) are respectively fixedly connected to the inner wall of the heating groove (201) and the guide ring (304). The heat-conducting pipe group (6) is arranged in an annular structure outside the motor (5), and the outer walls of both ends of the heat-conducting pipe group (6) located outside are both covered with insulation sleeves.

6. The energy-saving centrifugal pump according to claim 5, characterized in that: The cleaning mechanism (7) comprises an arc-shaped frame (701), a plurality of cleaning sleeves (702) are rotatably connected and provided on the arc-shaped frame (701), the inner wall of the cleaning sleeve (702) is arranged in sliding contact with the outer wall of the heat conduction pipe group (6), the outer wall of the cleaning sleeve (702) is fixedly connected and provided with a transmission wheel (703), the outer wall of the arc-shaped frame (701) is fixedly connected and provided with a limit bar (704), the outer wall of the limit bar (704) is slidably matched and provided with an adjustment frame (705), the adjustment frame (705) is fixedly connected and provided with an arc-shaped rack (706), and the arc-shaped rack (706) is meshed with the plurality of transmission wheels (703) for transmission.

7. An energy-saving centrifugal pump according to claim 6, characterized in that: A limit block (707) is fixedly connected to one side of the bottom end of the arc frame (701), a guide rod (708) is slidably provided through the limit block (707), one end of the guide rod (708) is slidably provided with the inner wall of the guide groove (403), and a connecting rod (709) is fixedly connected to the other end of the guide rod (708), and the other end of the connecting rod (709) is rotatably connected to the adjustment frame (705), and a transmission push rod (710) is fixedly connected to one side of the limit block (707).

8. The energy-saving centrifugal pump according to claim 7, characterized in that: An electric push rod (801) is fixedly connected to one side of the top cover (8), and the other end of the electric push rod (801) is fixedly connected to the inner wall of the protective seat (4). An inclined frame (802) is fixedly connected to the lower surface of the top cover (8), and the inner wall of the inclined frame (802) is slidably matched with the outer wall of the bottom end of the transmission push rod (710). Side plates (803) are rotatably connected to both sides of the top cover (8).

9. The energy-saving centrifugal pump according to claim 8, characterized in that: A worm (804) is provided on the inner wall of one side of the top cover (8) for rotational connection, an adjusting wheel (805) is fixedly provided on the outer end of the worm (804), the adjusting wheel (805) is meshed with the fixed rack (401) for transmission, a worm wheel (806) is provided on the inner end of the worm (804) for meshing transmission, a universal joint assembly (807) is fixedly provided on the worm wheel (806), and both ends of the universal joint assembly (807) are fixedly provided on one end of the two side plates (803).

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