Heat preservation device for Coriolis mass flow meter

Abstract

The invention discloses a heat preservation device for a Coriolis mass flowmeter, and relates to the technical field of Coriolis mass flowmeters.The heat preservation device comprises a flowmeter, a heat preservation box is installed on the outer side of the flowmeter in a sleeving mode, an external box is fixedly installed on one side of the heat preservation box, and a built-in heat circulation mechanism is installed in the heat preservation box; an external driving mechanism is installed in the external box, a heat adjusting mechanism is installed in the heat preservation box, a plurality of temperature sensors are fixedly connected to the interior of the heat preservation box, and a fixed transmission mechanism and a movable transmission mechanism are installed in the heat preservation box; the interior of the heat preservation box can be heated through cooperation of an external driving mechanism and an internal heat circulation mechanism, the temperature in the heat preservation box can be more uniform through cooperation of a fixed transmission mechanism, a movable transmission mechanism, a heat adjusting mechanism and a plurality of temperature sensors, and therefore the flow meter can be kept warm in an environment with the balanced temperature; therefore, the measurement data accuracy of the flowmeter is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Coriolis mass flowmeter, and particularly relates to a heat preservation device for Coriolis mass flowmeter. BACKGROUND

[0002] Coriolis mass flowmeter, also known as Coriolis force flowmeter, is a device for directly measuring mass flow by using the principle that the fluid flowing in a vibrating pipeline generates Coriolis force proportional to mass flow. The Coriolis mass flowmeter directly measures mass flow, has high precision, can measure multiple media and multiple process parameters, and is widely used in petrochemical, pharmaceutical, food and other industries. When the Coriolis force flowmeter measures the mass flow of the medium, sometimes heat preservation treatment is needed. Through retrieval of public documents, a Coriolis mass flowmeter with a coil type structure heat preservation jacket is disclosed in document CN216717499U, a Coriolis mass flowmeter with a heat preservation jacket is disclosed in document CN108195438A, and other similar patents are not described one by one here. They all use external circulation of heat conducting medium to realize heat transfer to heat or heat preservation of the Coriolis force flowmeter. However, when the heat medium circulates externally, there is heat loss, which increases the heating cost and causes insufficient heat utilization.

[0003] Therefore, to solve the above problems, the present application provides a heat preservation device for Coriolis mass flowmeter. SUMMARY

[0004] The present application provides a heat preservation device for Coriolis mass flowmeter to solve the above technical problems.

[0005] To solve the above technical problems, the present application provides a heat preservation device for Coriolis mass flowmeter, which comprises a flowmeter, a heat preservation box is installed outside the flowmeter, an external box is fixedly installed on one side of the heat preservation box; The heat preservation device comprises an internal heat circulation mechanism, an external driving mechanism and a heat adjustment mechanism. The heat preservation device comprises an internal heat circulation mechanism, an external driving mechanism and a heat adjustment mechanism. The heat preservation device comprises an internal heat circulation mechanism, an external driving mechanism and a heat adjustment mechanism. The heat preservation device comprises an internal heat circulation mechanism, an external driving mechanism and a heat adjustment mechanism. The fixed transmission mechanism and the movable transmission mechanism are arranged in the heat preservation box, the movable transmission mechanism is arranged above the fixed transmission mechanism, and the fixed transmission mechanism and the movable transmission mechanism are used for power transmission to drive the heat adjusting mechanism to operate.

[0006] Preferably, the heat preservation box is composed of an upper box body, a lower box body and a detachable plate, the upper box body is fixedly connected to the top of the lower box body through bolts, the detachable plate is inlaid on the front side of the lower box body, the lower box body and the detachable plate are fixedly connected through bolts, and an opening is arranged on one side of the lower box body and communicates with the inside of the external box.

[0007] Preferably, the external box is composed of a main box body and a side plate, the main box body is fixedly connected to one side of the lower box body through bolts, the side plate is fixedly connected to the side of the main box body away from the lower box body through bolts, and a heat dissipation opening is arranged at the bottom of the main box body.

[0008] Preferably, the built-in heat circulation mechanism comprises a coil pipe, the coil pipe is fixedly connected to the inside of the heat preservation box, an oil tank is fixedly connected between the two end portions of the coil pipe, a fixing seat is fixedly connected to the bottom of the oil tank, the oil tank is fixedly connected to the bottom end of the inside of the heat preservation box through the fixing seat, an electric heater is fixedly connected to the inside of the oil tank, a transmission rod is movably connected to one side of the oil tank, a propeller is fixedly connected to one end of the transmission rod, and the propeller is located between the two end portions of the coil pipe.

[0009] Preferably, the external driving mechanism comprises a fixed plate, the fixed plate is fixedly connected to the inside of the external box, an alternating current servo motor is fixedly connected to the top of the fixed plate, a damping pad is fixedly connected between the fixed plate and the alternating current servo motor, the transmission rod is located in the oil tank and extends into the inside of the external box, the transmission rod is movably connected to the heat preservation box, a first belt pulley is fixedly connected to the other end of the transmission rod and the output shaft of the alternating current servo motor, two first belt pulleys are connected to each other through a first belt, and a first tensioner mechanism is further connected to the first belt.

[0010] Preferably, the fixed transmission mechanism comprises a second belt pulley, the second belt pulley is fixedly connected to the outer end of the transmission rod, the transmission rod is located in the heat preservation box, a first shaft rod is movably connected to the inner side wall of the heat preservation box, a third belt pulley is fixed to the tail end of the first shaft rod, the second belt pulley and the third belt pulley are connected to each other through a second belt, and a first friction wheel is fixedly connected to the outer end of the first shaft rod.

[0011] Preferably, the heat adjusting mechanism comprises a second shaft rod, the second shaft rod is movably connected to the inner side wall of the lower box body, and a fan blade is fixedly connected to the tail end of the second shaft rod.

[0012] Preferably, the movable transmission mechanism comprises a movable block, the movable block penetrates through the opening, the movable block is slidably connected with the incubator through the opening, one side of the movable block is movably connected with a third shaft rod, the outer end of the third shaft rod is fixedly connected with a second friction wheel, the tail end of the third shaft rod is fixedly connected with a fourth belt pulley, the outer end of the second shaft rod is fixedly connected with a fifth belt pulley, the fourth belt pulley and the fifth belt pulley are connected with each other through a third belt, the third belt is further connected with a second tensioner mechanism, the other side of the movable block is fixedly connected with a connecting block, the connecting block is located in the external box, and an electric push rod is fixedly connected between the top of the connecting block and the top end of the internal top of the external box.

[0013] Preferably, the movable block is composed of a long plate, a rectangular block and a short plate, the rectangular block is fixedly connected between the long plate and the short plate, the long plate and the short plate are located in the internal top of the incubator and the external box respectively, and the rectangular block is slidably connected in the opening.

[0014] Preferably, the second tensioner mechanism comprises a sliding rail, the sliding rail is fixedly connected to the inner side wall of the incubator, a sliding block is slidably connected to the sliding rail, a fourth shaft rod is fixedly connected to the sliding block, a tensioner pulley is movably connected to the tail end of the fourth shaft rod, and a tension spring is fixedly connected between the outer end of the fourth shaft rod and the rear side of the internal top of the incubator.

[0015] Compared with the related art, the incubator for the Coriolis mass flowmeter has the following beneficial effects: The internal heating and circulation of the heat medium can heat the air in the incubator, thereby realizing the incubation function of the flowmeter, and the cooperation of the fixed transmission mechanism, the movable transmission mechanism, the thermal regulation mechanism and the plurality of temperature sensors can make the temperature in the incubator more uniform, thereby making the flowmeter be incubated in a temperature-balanced environment, so as to ensure the accuracy of the measurement data of the flowmeter. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a first perspective view of the overall structure of the present application. Figure 2 It is a second perspective view of the overall structure of the present application. Figure 3 It is a structure diagram of the flowmeter of the present application. Figure 4 It is an exploded view of the incubator and the external box of the present application. Figure 5 It is a sectional view of the overall structure of the present application. Figure 6 It is a structure diagram of the internal heat circulation mechanism, the external driving mechanism and the fixed transmission mechanism of the present application. Figure 7 It is the schematic diagram of partial section structure of built-in thermal cycle mechanism of the application; Figure 8 It is the schematic diagram of thermal adjustment mechanism and movable transmission mechanism structure of the application; Figure 9 It is the schematic diagram of movable block structure of the application; Figure 10 It is the schematic diagram of second tension pulley mechanism structure of the application.

[0017] The figure mark: 1, flow meter, 2, heat preservation box, 21, upper box body, 22, lower box body, 221, opening, 23, detachable plate, 3, external box, 31, main box body, 311, heat dissipation port, 32, side plate, 4, temperature sensor, 5, built-in thermal cycle mechanism, 51, coil pipe, 52, oil tank, 53, fixed seat, 54, electric heater, 55, transmission rod, 56, propeller, 6, external driving mechanism, 61, fixed plate, 62, shock pad, 63, alternating current servo motor, 64, first belt pulley, 65, first belt, 66, first tension pulley mechanism, 7, fixed transmission mechanism, 71, second belt pulley, 72, second belt, 73, third belt pulley, 74, first shaft rod, 75, first friction wheel, 8, thermal adjustment mechanism, 81, second shaft rod, 82, fan blade, 9, movable transmission mechanism, 91, movable block, 911, long plate, 912, rectangular block, 913, short plate, 92, third shaft rod, 93, fourth belt pulley, 94, fifth belt pulley, 95, third belt, 96, second friction wheel, 97, connecting block, 98, electric push rod, 99, second tension pulley mechanism, 991, slide rail, 992, slide block, 993, fourth shaft rod, 994, tension belt pulley, 995, tension spring. DETAILED DESCRIPTION

[0018] Please refer to Figures 1-10 The technical scheme provided by the application specifically includes the following embodiments: The application includes a flow meter 1, a heat preservation box 2 is installed outside the flow meter 1, and an external box 3 is fixedly installed on one side of the heat preservation box 2. A built-in thermal cycle mechanism 5 is installed inside the heat preservation box 2, and the built-in thermal cycle mechanism 5 is used for heating and heat preservation of the flow meter 1. An external driving mechanism 6 is installed inside the external box 3, and the external driving mechanism 6 is used for driving the circulation of heat conducting oil in the built-in thermal cycle mechanism 5. A thermal adjustment mechanism 8 is installed inside the heat preservation box 2, and the thermal adjustment mechanism 8 is used for uniform distribution of heat inside the heat preservation box 2. Temperature sensor 4, a plurality of temperature sensors 4 are fixedly connected inside the incubator 2, and the temperature sensors 4 are used to measure the real-time temperature of multiple parts inside the incubator 2. Fixed transmission mechanism 7 and movable transmission mechanism 9, the fixed transmission mechanism 7 and the movable transmission mechanism 9 are installed inside the incubator 2, the movable transmission mechanism 9 is located above the fixed transmission mechanism 7, and the fixed transmission mechanism 7 and the movable transmission mechanism 9 are used for power transmission to drive the heat adjusting mechanism 8 to run.

[0019] The incubator 2 is composed of an upper box body 21, a lower box body 22 and a detachable plate 23, the upper box body 21 is fixedly connected on the top of the lower box body 22 through bolts, the detachable plate 23 is inlaid on the front side of the lower box body 22, the lower box body 22 and the detachable plate 23 are fixedly connected through bolts, and the lower box body 22 is provided with an opening 221 on one side.

[0020] The incubator 2 is divided into the upper box body 21, the lower box body 22 and the detachable plate 23, so that the flowmeter 1 can be more conveniently installed inside the incubator 2, and all the components installed in the incubator 2 are installed on the lower box body 22, the detachable plate 23 is removed, and the components inside the lower box body 22 can be conveniently assembled, disassembled and maintained, after the detachable plate 23 is installed on the lower box body 22, the inside of the incubator 2 is in a closed state, and the inner wall of the incubator 2 is also sprayed with heat insulation paint, so that the incubator 2 can have better heat preservation effect.

[0021] The outer box 3 is composed of a main box body 31 and a side plate 32, the main box body 31 is fixedly connected on one side of the lower box body 22 through bolts, and the side plate 32 is fixedly connected on the side of the main box body 31 away from the lower box body 22 through bolts.

[0022] The outer box 3 can be used to install the external driving mechanism 6, and the outer box 3 is divided into the main box body 31 and the side plate 32, so that when the external driving mechanism 6 and other components are installed, the side plate 32 can be removed first, and then the side plate 32 can be installed after assembly, the outer box 3 does not need heat preservation effect, and at the same time, the heat dissipation port 311 at the bottom of the outer box 3 can also make a small amount of heat from the heat radiation of the incubator 2 into the outer box 3 and the heat generated by the operation of the components to dissipate.

[0023] The built-in heat cycle mechanism 5 includes a coil pipe 51 fixedly connected inside the heat preservation box 2, an oil tank 52 fixedly connected between both ends of the coil pipe 51, a fixed seat 53 fixedly connected to the bottom of the oil tank 52, the oil tank 52 fixedly connected to the bottom end inside the heat preservation box 2 through the fixed seat 53, an electric heater 54 fixedly connected inside the oil tank 52, a transmission rod 55 penetratingly and movably connected to one side of the oil tank 52, a propeller 56 fixedly connected to one end of the transmission rod 55, and the propeller 56 located between both ends of the coil pipe 51.

[0024] The built-in heat cycle mechanism 5 can use heat conducting oil as a liquid medium, the electric heater 54 as a driven heating component, and the transmission rod 55 and the propeller 56 driven to rotate by the external driving mechanism 6, so that the heat conducting oil in the coil pipe 51 is driven to circulate and flow by the rotation of the propeller 56, to heat the air inside the heat preservation box 2 by heat radiation, and then heat and preserve the flow meter 1. The connection between the transmission rod 55 and the oil tank 52 can adopt a sealing mode including but not limited to mechanical sealing, which can prevent the heat conducting oil from leaking and does not affect the rotation of the transmission rod 55. The oil tank 52 and the coil pipe 51 can be made of metal materials with good heat conducting performance, including but not limited to copper pipes.

[0025] The external driving mechanism 6 includes a fixed plate 61 fixedly connected inside the external box 3, an alternating current servo motor 63 fixedly connected to the top of the fixed plate 61, a damping pad 62 fixedly connected between the fixed plate 61 and the alternating current servo motor 63, the transmission rod 55 located inside the oil tank 52 and extending into the external box 3, the transmission rod 55 movably connected to the heat preservation box 2, a first belt pulley 64 fixedly connected to the other end of the transmission rod 55 and the output shaft of the alternating current servo motor 63, two first belt pulleys 64 connected to each other through a first belt 65, and a first tensioner mechanism 66 connected to the first belt 65.

[0026] The external driving mechanism 6 is installed inside the external box 3, and the fixed plate 61 for installing the alternating current servo motor 63 is also provided with the damping pad 62. The alternating current servo motor 63 has very small noise and vibration, and is used in combination with the damping pad 62 and externally installed on the outside of the heat preservation box 2, so that the vibration generated by the external driving mechanism 6 during operation is very small and almost cannot be transmitted to the flow meter 1, so as not to affect the normal operation of the flow meter 1. The first belt pulley 64 and the first belt 65 can be used for transmission to drive the transmission rod 55 to rotate, and the first tensioner mechanism 66 can keep the first belt 65 in a taut state to avoid the elastic deformation of the first belt 65 and the vibration of the first belt 65 caused by other factors during operation, and also can ensure the normal transmission ratio of the belt transmission.

[0027] The fixed transmission mechanism 7 comprises a second pulley 71 fixedly connected to the outer end of a transmission rod 55 located inside the heat preservation box 2, a first shaft rod 74 movably connected to the inner side wall of the heat preservation box 2, a third pulley 73 fixed to the end of the first shaft rod 74, and a first friction wheel 75 fixedly connected to the outer end of the first shaft rod 74.

[0028] The fixed transmission mechanism 7 is achieved by the second pulley 71, the second belt 72 and the third pulley 73 to drive the first friction wheel 75 to rotate when the transmission rod 55 rotates.

[0029] The heat adjustment mechanism 8 comprises a second shaft rod 81 movably connected to the inner side wall of the lower box body 22, and a fan blade 82 fixedly connected to the end of the second shaft rod 81.

[0030] The cooperation of the fixed transmission mechanism 7 and the movable transmission mechanism 9 enables the heat adjustment mechanism 8 to be driven to rotate the fan blade 82 by rotating the transmission rod 55, and the rotation of the fan blade 82 can blow the air inside the heat preservation box 2 to flow, so that the air in each part of the heat preservation box 2 flows turbulently, and the air flow carries heat, thereby making the heat in the heat preservation box 2 evenly distributed, i.e. the temperature of each part is completely or tends to be completely the same, so that the flow meter 1 can be in a heat preservation state in a required temperature environment.

[0031] The operation time of the heat adjustment mechanism 8 is controlled by the detection results of the plurality of temperature sensors 4, and the number of temperature sensors 4 is set to four, which are respectively arranged on the two sides, the bottom and the rear side of the heat preservation box 2. The four temperature sensors 4 almost cover all places inside the heat preservation box 2. First, the temperature sensor 4 can measure the temperature inside the heat preservation box 2 to control the operating heating temperature of the built-in heat circulation mechanism 5. When the temperature difference detected by the four temperature sensors 4 is large, i.e. exceeds the set temperature difference, it means that the temperature inside the heat preservation box 2 is not uniform, and the non-uniform temperature may have adverse effects on the heat preservation effect of the flow meter 1 and the operation measurement effect of the flow meter 1. Therefore, the heat adjustment mechanism 8 can be operated to make the temperature of all corners inside the heat preservation box 2 the same, so that the flow meter 1 is in a heat preservation state in a heat preservation box 2 with the same temperature.

[0032] The movable transmission mechanism 9 comprises a movable block 91 which penetrates the opening 221 and is in sliding connection with the heat preservation box 2 through the opening 221, one side of the movable block 91 is movably connected with a third shaft rod 92, the outer end of the third shaft rod 92 is fixedly connected with a second friction wheel 96, the tail end of the third shaft rod 92 is fixedly connected with a fourth belt wheel 93, the outer end of the second shaft rod 81 is fixedly connected with a fifth belt wheel 94, the fourth belt wheel 93 and the fifth belt wheel 94 are connected with each other through a third belt 95, the third belt 95 is further connected with a second tensioner mechanism 99, the other side of the movable block 91 is fixedly connected with a connecting block 97, the connecting block 97 is located inside the external box 3, and the top of the connecting block 97 is fixedly connected with the electric push rod 98.

[0033] When the heat adjustment mechanism 8 needs to be driven to operate, the connecting block 97, the movable block 91 and the third shaft rod 92 can be pushed downward by the electric push rod 88 at this time, until the second friction wheel 96 on the third shaft rod 92 moves downward and contacts the first friction wheel 75, at this time, the rotation of the second friction wheel 96 can drive the fourth belt wheel 93, the fifth belt wheel 94 and the third belt 95 to operate to drive the heat adjustment mechanism 8 to operate, and the second tensioner mechanism 99 can make the third belt 95 always in a taut state when the fourth belt wheel 93 moves up and down, so as to avoid affecting the transmission ratio of the belt transmission.

[0034] The movable block 91 is composed of a long plate 911, a rectangular block 912 and a short plate 913, the rectangular block 912 is fixedly connected between the long plate 911 and the short plate 913, the long plate 911 and the short plate 913 are respectively located inside the heat preservation box 2 and the external box 3, the rectangular block 912 is in sliding connection inside the opening 221, and the long plate 911 can completely cover the opening 221.

[0035] The movable block 91 can be made of heat insulation material, and when the movable block 91 moves up and down, the long plate 911 always covers the opening 221, so that the heat in the heat preservation box 2 can be prevented from being directly transmitted to the inside of the external box 3, and meanwhile, the up and down movement of the movable block 91 is not affected.

[0036] The second tensioner mechanism 99 comprises a slide rail 991 which is fixedly connected to the inner side wall of the heat preservation box 2, a sliding block 992 which is in sliding connection with the slide rail 991, a fourth shaft rod 993 which is fixedly connected to the sliding block 992, a tensioner belt wheel 994 which is movably connected to the tail end of the fourth shaft rod 993, and a tension spring 995 which is fixedly connected between the outer end of the fourth shaft rod 993 and the back side of the inside of the heat preservation box 2.

[0037] The first tensioner mechanism 66 and the second tensioner mechanism 99 have the same structure and the same function, and the difference is that the first tensioner mechanism 66 and the second tensioner mechanism 99 are respectively used for the first belt 65 and the third belt 95, so the specific structure of the first tensioner mechanism 66 will not be described here. The rear end of the tension spring 995 is connected to the rear side of the heat preservation box 2, and the fourth shaft rod 993 of the tension belt pulley 994 is slidably connected to the inner side wall of the heat preservation box 2 through the slide rail 991 and the sliding block 992. When the second tensioner 96 moves downward, the fourth belt pulley 93 moves downward together, and at this time the third belt 95 is tightened, and the tension belt pulley 994 moves to adapt to the tightness of the third belt 95, so that the third belt 95 is always in a good state of tension.

[0038] Working principle: When in use, the transmission rod 55 and the propeller 56 in the built-in heat circulation mechanism 5 are driven to rotate by the external driving mechanism 6. When the propeller 56 rotates, it can drive the heat transfer oil in the oil tank 52 and the coil pipe 51 to circulate. During this period, the heat transfer oil is heated by the electric heater 54. The heat in the heat transfer oil is transferred to the air in the heat preservation box 2 through the coil pipe 51, and the temperature sensor 4 detects the temperature of each part of the heat preservation box 2. When the temperature difference detected by the multiple temperature sensors 4 is large, the electric push rod 98 in the movable transmission mechanism 9 pushes the movable block 91 to move downward through the connecting block 97, so that the second friction pulley 96 installed on one side of the movable block 91 moves downward and contacts the first shaft rod 74 in the fixed transmission mechanism 7. At this time, the fixed transmission mechanism 7 and the movable transmission mechanism 9 cooperate with each other to transmit the driving force of the transmission rod 55 to the heat regulating mechanism 8 during rotation. During this period, the second shaft rod 81 rotates and drives the fan blade 82 to rotate. When the fan blade 82 rotates, it can blow the air in the heat preservation box 2 to flow, so that the air in the heat preservation box 2 flows in a chaotic manner, and the heat is carried away by the flowing air, so that the heat in the heat preservation box 2 is evenly distributed, that is, the temperature of each part is completely or tends to be completely the same, so that the flow meter 1 can be in a heat preservation state in a required temperature environment.

Claims

1. A thermal insulation device for a Coriolis mass flowmeter comprising a flowmeter (1), characterized in that: The flow meter (1) is externally sleeved with a heat preservation box (2), and one side of the heat preservation box (2) is fixedly provided with an external box (3); The heat preservation box (2) is internally provided with a built-in heat circulation mechanism (5), and the built-in heat circulation mechanism (5) is used for heating and preserving the flow meter (1); The external box (3) is internally provided with an external driving mechanism (6), and the external driving mechanism (6) is used for driving the heat-conducting oil in the built-in heat circulation mechanism (5) to circulate; The heat preservation box (2) is internally provided with a heat adjusting mechanism (8), and the heat adjusting mechanism (8) is used for uniformly distributing the heat in the heat preservation box (2); The heat preservation box (2) is internally fixedly connected with a plurality of temperature sensors (4), and the temperature sensors (4) are used for measuring the real-time temperatures of a plurality of parts in the heat preservation box (2); The heat preservation box (2) is internally provided with a fixed transmission mechanism (7) and a movable transmission mechanism (9), the movable transmission mechanism (9) is located above the fixed transmission mechanism (7), and the fixed transmission mechanism (7) and the movable transmission mechanism (9) are used for power transmission and driving the heat adjusting mechanism (8) to operate.

2. The thermal isolating device for a Coriolis mass flowmeter of claim 1 wherein, The heat preservation box (2) is composed of an upper box body (21), a lower box body (22) and a detachable plate (23), the upper box body (21) is fixedly connected to the top of the lower box body (22) through bolts, the detachable plate (23) is inlaid on the front side of the lower box body (22), the lower box body (22) and the detachable plate (23) are fixedly connected through bolts, and one side of the lower box body (22) is provided with an opening (221) which is in communication with the inside of the external box (3).

3. The thermal isolating device for a Coriolis mass flowmeter of claim 2 wherein, The external box (3) is composed of a main box body (31) and a side plate (32), the main box body (31) is fixedly connected to one side of the lower box body (22) through bolts, the side plate (32) is fixedly connected to the side of the main box body (31) away from the lower box body (22) through bolts, and the bottom of the main box body (31) is provided with a heat dissipation opening (311).

4. The thermal isolating device for a Coriolis mass flowmeter of claim 1 wherein, The built-in heat circulation mechanism (5) comprises a coil pipe (51), the coil pipe (51) is fixedly connected to the inside of the heat preservation box (2), oil tanks (52) are fixedly connected between the two ends of the coil pipe (51), fixed seats (53) are fixedly connected to the bottoms of the oil tanks (52), the oil tanks (52) are fixedly connected to the bottom end of the heat preservation box (2) through the fixed seats (53), electric heaters (54) are fixedly connected to the insides of the oil tanks (52), transmission rods (55) penetrate the oil tanks (52) and are movably connected to one side of the heat preservation box (2), propellers (56) are fixedly connected to one end of the transmission rods (55), and the propellers (56) are located between the two ends of the coil pipe (51).

5. The thermal isolating device for a Coriolis mass flowmeter of claim 4 wherein, The external driving mechanism (6) includes a fixed plate (61) fixedly connected inside the external box (3), the top of the fixed plate (61) is fixedly connected with an alternating current servo motor (63), a damping pad (62) is fixedly connected between the fixed plate (61) and the alternating current servo motor (63), the transmission rod (55) is located inside the oil tank (52) and extends into the external box (3), the transmission rod (55) is movably connected with the heat preservation box (2), the other end of the transmission rod (55) and the output shaft of the alternating current servo motor (63) are fixedly connected with first belt pulleys (64), the two first belt pulleys (64) are connected with each other through a first belt (65), and the first belt (65) is also connected with a first tensioner mechanism (66).

6. The thermal isolating device for a Coriolis mass flowmeter of claim 5 wherein, The fixed transmission mechanism (7) includes a second belt pulley (71) fixedly connected to the outer end of the transmission rod (55), the transmission rod (55) is located inside the heat preservation box (2), a first shaft rod (74) is movably connected to the inner side wall of the heat preservation box (2), a third belt pulley (73) is fixed to the end of the first shaft rod (74), the second belt pulley (71) and the third belt pulley (73) are connected with each other through a second belt (72), and the outer end of the first shaft rod (74) is fixedly connected with a first friction wheel (75).

7. The thermal isolating device for a Coriolis mass flowmeter of claim 2 wherein, The heat adjusting mechanism (8) includes a second shaft rod (81) movably connected to the inner side wall of the lower box body (22), and a fan blade (82) is fixed to the end of the second shaft rod (81).

8. The thermal insulating device for a Coriolis mass flowmeter of claim 7 wherein, The movable transmission mechanism (9) includes a movable block (91) penetrating through an opening (221), the movable block (91) is slidably connected with the heat preservation box (2) through the opening (221), a third shaft rod (92) is movably connected to one side of the movable block (91), a second friction wheel (96) is fixed to the outer end of the third shaft rod (92), a fourth belt pulley (93) is fixed to the end of the third shaft rod (92), a fifth belt pulley (94) is fixed to the outer end of the second shaft rod (81), the fourth belt pulley (93) and the fifth belt pulley (94) are connected with each other through a third belt (95), the third belt (95) is also connected with a second tensioner mechanism (99), a connecting block (97) is fixed to the other side of the movable block (91), the connecting block (97) is located inside the external box (3), and an electric push rod (98) is fixedly connected between the top of the connecting block (97) and the top end of the inside of the external box (3).

9. The thermal insulation device for a Coriolis mass flowmeter of claim 8 wherein, The movable block (91) is composed of a long plate (911), a rectangular block (912) and a short plate (913), the rectangular block (912) is fixedly connected between the long plate (911) and the short plate (913), the long plate (911) and the short plate (913) are located inside the heat preservation box (2) and the external box (3) respectively, the rectangular block (912) is slidably connected inside the opening (221), and the long plate (911) can completely cover the opening (221).

10. The thermal isolating device for a Coriolis mass flowmeter of claim 8 wherein, The second tensioning wheel mechanism (99) comprises a sliding rail (991) fixedly connected to the inner side wall of the heat preservation box (2), a sliding block (992) slidably connected to the sliding rail (991), a fourth shaft rod (993) fixedly connected to the sliding block (992), and a tensioning belt pulley (994) movably connected to the end of the fourth shaft rod (993); the outer end of the fourth shaft rod (993) and the inner rear side of the heat preservation box (2) are fixedly connected with a tension spring (995).

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