A high efficiency fluid delivery pump

Abstract

This invention discloses a high-efficiency fluid transfer pump, comprising a shared mounting base and at least two sets of fluid transfer units arranged in parallel. Each fluid transfer unit includes a drive motor, a flexible coupling, an inertial flywheel, a pump shaft assembly, and a centrifugal pump body. The drive motor and the centrifugal pump body are both fixed to the upper surface of the shared mounting base. The output shaft of the drive motor is coaxially connected to the pump shaft assembly via the flexible coupling. The inertial flywheel is coaxially fixedly sleeved in the middle of the pump shaft assembly, and the other end of the pump shaft assembly is drively connected to the impeller of the centrifugal pump body. Multiple transfer units are arranged parallel along the length of the shared base, forming a parallel transfer structure that can operate independently or in combination. This invention adopts an integrated structure of a single shared base, dual pumps in parallel, and flywheel energy storage, solving the core problems of existing transfer pumps such as small flow adjustment range, large operating vibration, strong start-stop impact, and high energy consumption. It allows for flexible switching of operating modes according to flow requirements.

Description

Technical Field

[0001] This invention belongs to the field of fluid transport machinery technology, and specifically relates to a high-efficiency fluid transport pump. Background Technology

[0002] Fluid transfer pumps are among the most widely used general-purpose machines in all sectors of the national economy, consuming over 20% of the country's total electricity and making them a major energy-consuming device in the industrial sector. With the continuous expansion of industrial production and increasingly stringent requirements for energy conservation and emission reduction, ever-higher demands are being placed on the operating efficiency, stability, reliability, and flow regulation capabilities of fluid transfer pumps.

[0003] Existing fluid transfer pumps currently in practical applications suffer from the following unavoidable core technical defects, which are also the technical pain points that this invention specifically addresses: Single-pump systems have limited flow regulation range and extremely low efficiency under low load. Most existing fluid transport systems use a single-pump configuration, where flow regulation can only be achieved through valve throttling or frequency converter speed control. Valve throttling results in significant energy waste, and frequency converter speed control leads to a substantial drop in motor efficiency at low speeds. When system flow demand fluctuates significantly, single-pump systems cannot efficiently operate under both high and low flow conditions, resulting in an overall operating efficiency of less than 60% and severe energy waste.

[0004] Multi-pump parallel systems suffer from poor installation accuracy, significant operational vibration, and a high failure rate. Existing multi-pump parallel systems often employ independent bases for on-site installation. Due to limitations imposed by on-site construction conditions, it is difficult to guarantee the coaxiality of the motor and pump body; the coaxiality error typically exceeds 0.1mm. This results in severe vibration and noise during operation, accelerated wear of vulnerable components such as bearings and seals, and a reduction in service life of over 50%. Furthermore, the vibration can cause pipeline connections to loosen, creating a safety hazard of media leakage.

[0005] Without an energy storage buffer structure, the pumps experience significant shocks during start-up, shutdown, and sudden load changes. Existing transfer pumps lack dedicated energy storage devices. When starting the pump unit, the motor must overcome enormous rotational inertia and hydraulic resistance, with the starting current reaching 5-7 times the rated current, easily causing motor overload and burnout. Simultaneously, sudden load changes in the system generate strong hydraulic and mechanical shocks, easily leading to serious malfunctions such as pump shaft breakage, impeller damage, and pipe rupture, accounting for over 60% of all pump unit failures.

[0006] Insufficient base rigidity can easily lead to resonance. Existing independent bases are mostly made of thin steel plates with simple welding, resulting in poor structural rigidity. When the operating frequency of the pump unit is close to the natural frequency of the base, resonance will occur, further aggravating the vibration and damage of the equipment. In severe cases, it can cause the entire system to malfunction.

[0007] The transmission system lacks vibration damping compensation, resulting in significant transmission losses. Existing pump sets mostly use rigid couplings to connect the motor and pump shaft, which cannot compensate for installation coaxiality errors and axial movement during operation. This generates additional loads during transmission, increasing transmission losses and accelerating wear on bearings and couplings.

[0008] In view of the above-mentioned shortcomings of existing technologies, there is currently no effective integrated solution in the industry. Therefore, the development of a high-efficiency fluid transfer pump with a wide flow adjustment range, high operating efficiency, low vibration, low impact, and high reliability has become an urgent need in the fluid transfer industry, and has extremely high energy-saving value and engineering application value. Summary of the Invention

[0009] In view of the problems mentioned in the background technology above, the purpose of this invention is to provide a high-efficiency fluid transfer pump. This invention adopts an integrated structure with a common base, dual pumps in parallel, and flywheel energy storage, which solves the core problems of existing transfer pumps such as small flow adjustment range, large operating vibration, strong start-stop impact, and high energy consumption. The operating mode can be flexibly switched according to flow requirements.

[0010] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A high-efficiency fluid delivery pump includes a common mounting base and at least two sets of fluid delivery units with identical structures; The fluid delivery unit includes a drive motor, a flexible coupling, an inertial flywheel, a pump shaft assembly, and a centrifugal pump body. The bottom of the drive motor is fixed to the upper surface of a common mounting base. The output shaft of the drive motor is horizontally oriented towards the centrifugal pump body. The driving end of the flexible coupling is coaxially and fixedly connected to the output shaft of the drive motor, and the driven end of the flexible coupling is coaxially and fixedly connected to the input end of the pump shaft assembly. The inertial flywheel is a disc-shaped structure, coaxially fixedly sleeved on the middle section of the pump shaft assembly. The output end of the pump shaft assembly extends into the internal cavity of the centrifugal pump body and is coaxially fixedly connected to the centrifugal pump body. The bottom of the centrifugal pump body is fixed to the upper surface of the common mounting base and located on the same side of the drive motor. At least two sets of fluid delivery units are arranged symmetrically and parallel to each other along the length direction of the common mounting base to form a multi-pump parallel fluid delivery structure.

[0011] Furthermore, the common mounting base is a rectangular channel steel structure welded in one piece. The base has cross-shaped reinforcing ribs welded inside. The upper surface of the base has multiple sets of bolt mounting holes adapted to the drive motor and centrifugal pump body. The bottom edge of the base has a downwardly extending flange structure.

[0012] Further defined, the flexible coupling includes a driving half-coupling, a driven half-coupling, and an elastic body; the driving half-coupling is fixedly connected to the output shaft of the drive motor, the driven half-coupling is coaxially fixedly connected to the input end of the pump shaft assembly, and the elastic body is embedded between the driving half-coupling and the driven half-coupling.

[0013] Furthermore, the inertial flywheel has a disc-shaped structure, with a shaft hole at its center. It is fixedly connected to the middle shaft section of the pump shaft assembly via a flat key. Locking nuts are provided on both sides of the inertial flywheel, and the locking nuts are threadedly connected to the pump shaft assembly to achieve axial positioning of the inertial flywheel.

[0014] Further specifying, the pump shaft assembly includes a rolling bearing, a shaft seal component, and a pump shaft. The rolling bearing is disposed inside the bearing housing of the centrifugal pump body and sleeved on the outside of the pump shaft. The shaft seal component is disposed at the mating gap between the pump shaft and the centrifugal pump body.

[0015] Further specified, the centrifugal pump body is a single-stage single-suction horizontal centrifugal pump, with a vertically upward inlet flange on the top of the pump body and a horizontal outlet flange on the side of the pump body. Both the inlet flange and the outlet flange have multiple bolt connection holes arranged equidistantly along the circumference on their end faces.

[0016] Further specifying, the number of fluid delivery units is set, with the drive motors of the two sets of fluid delivery units arranged symmetrically on the right side of the common mounting base, and the two sets of centrifugal pump bodies arranged symmetrically on the left side of the common mounting base. The inlet flanges and outlet flanges of the two sets of centrifugal pump bodies are connected in parallel through pipelines.

[0017] Further specified, the drive motor is a three-phase asynchronous motor, the top of the drive motor is provided with a square junction box, the rear end of the drive motor is provided with a fan cover with heat dissipation holes, and the bottom of the drive motor is provided with multiple mounting holes, which are fixedly connected to a common mounting base by anchor bolts.

[0018] The beneficial effects of this invention are: The invention adopts a dual-pump parallel structure, which can flexibly select single or dual pump operation according to the system flow demand, and has a large flow adjustment range. When the flow is low, the single pump operates to avoid the energy waste of valve throttling. When the flow is high, the dual pumps operate together to meet the peak flow demand, and the overall system operating efficiency is improved.

[0019] This invention adopts an integrated welded common base, and all mounting holes are precision machined in the factory. The coaxiality of the motor and pump body can be controlled within millimeters, which is far higher than the precision of on-site installation. At the same time, the base is equipped with reinforcing ribs, which significantly improves the structural rigidity and completely avoids resonance.

[0020] This invention features an inertial flywheel mounted on the pump shaft. The flywheel's rotational inertia stores kinetic energy. When the pump unit starts, the flywheel releases kinetic energy to assist the motor in starting, reducing the starting current and preventing motor overload. When the system load changes abruptly, the flywheel absorbs the impact energy, smoothing load fluctuations and eliminating hydraulic and mechanical impacts. This reduces the incidence of impact-related failures such as pump shaft breakage and impeller damage, significantly improving the reliability of equipment operation.

[0021] This invention uses an elastic coupling to connect the motor and pump shaft, which can effectively compensate for installation coaxiality errors and axial movement during operation, eliminate additional loads, and improve transmission efficiency. At the same time, the elastic body can absorb vibrations during transmission, further reducing the operating vibration and noise of the pump set and extending the service life of the coupling and bearings. Attached Figure Description

[0022] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of the equiaxed side structure of an embodiment of a high-efficiency fluid transport pump according to the present invention; Figure 2 This is a schematic diagram of the structure of an embodiment of a high-efficiency fluid delivery pump according to the present invention; Figure 3 This is a side view of an embodiment of a high-efficiency fluid delivery pump according to the present invention.

[0023] The symbols for the main components are explained as follows: 1. Drive motor; 2. Common mounting base; 3. Flexible coupling; 4. Inertia flywheel; 5. Pump shaft assembly; 6. Centrifugal pump body; 11. Square junction box; 12. Fan cover; 21. Reinforcing rib; 31. Active half coupling; 32. Driven half coupling; 33. Elastic body; 51. Shaft seal component; 52. Pump shaft; 61. Inlet flange; 62. Outlet flange; 63. Bolt connection hole. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] like Figure 1 As shown, a high-efficiency fluid delivery pump of the present invention includes a common mounting base 2 and at least two sets of fluid delivery units with identical structures. The fluid transport unit includes a drive motor 1, a flexible coupling 3, an inertial flywheel 4, a pump shaft assembly 5, and a centrifugal pump body 6. The bottom of the drive motor 1 is fixed to the upper surface of the common mounting base 2. The output shaft of the drive motor 1 is horizontally oriented towards the centrifugal pump body 6. The driving end of the flexible coupling 3 is coaxially and fixedly connected to the output shaft of the drive motor 1, and the driven end of the flexible coupling 3 is coaxially and fixedly connected to the input end of the pump shaft assembly 5. The inertial flywheel 4 is a disc-shaped structure, coaxially fixedly sleeved on the middle shaft section of the pump shaft assembly 5. The output end of the pump shaft assembly 5 extends into the internal cavity of the centrifugal pump body 6 and is coaxially fixedly connected to the centrifugal pump body 6. The bottom of the centrifugal pump body 6 is fixed to the upper surface of the common mounting base 2 and located on the same side of the drive motor 1. At least two sets of fluid delivery units are arranged symmetrically and parallel to each other along the length direction of the common mounting base 2 to form a multi-pump parallel fluid delivery structure.

[0028] In the practical application of this embodiment, the common mounting base 2 is a rectangular channel steel structure welded in one piece. The base has a cross-shaped reinforcing rib plate 21 welded inside. The upper surface of the base has multiple sets of bolt mounting holes adapted to the drive motor 1 and the centrifugal pump body 6. The bottom edge of the base has a downwardly extending flange structure.

[0029] In the practical application of this embodiment, the flexible coupling 3 includes an active half coupling 31, a driven half coupling 32, and an elastic body 33; the active half coupling 31 is fixedly connected to the output shaft of the drive motor 1, the driven half coupling 32 is coaxially fixedly connected to the input end of the pump shaft assembly 5, and the elastic body is embedded between the active half coupling 31 and the driven half coupling 32.

[0030] Specifically, the flexible coupling 3 adopts an ML5 type plum blossom-shaped flexible coupling with a nominal torque of 250 N·m and an allowable speed of 3800 r / min; the driving half coupling 31 is fixedly connected to the output shaft of the drive motor 1 by a flat key, and the driven half coupling 32 is fixedly connected to the input end of the pump shaft 52 by a flat key; the plum blossom-shaped elastomer is made of polyurethane material, which has good elasticity and wear resistance.

[0031] In the practical application of this embodiment, the inertial flywheel 4 has a disc-shaped structure. The center of the inertial flywheel 4 has a shaft hole and is fixedly connected to the middle shaft section of the pump shaft assembly 5 by a flat key. Locking nuts are provided on both sides of the inertial flywheel 4 and are threadedly connected to the pump shaft assembly 5 to achieve axial positioning of the inertial flywheel 4.

[0032] Specifically, the inertia flywheel 4 is a solid disc structure made of HT200 gray cast iron, with a diameter of 300mm and a thickness of 50mm; the center of the inertia flywheel 4 has a φ42mm shaft hole, and M42×1.5 locking nuts are provided on both sides of the inertia flywheel 4 to achieve axial positioning.

[0033] In the practical application of this embodiment, the pump shaft assembly 5 includes a rolling bearing, a shaft seal component 51, and a pump shaft 52. The rolling bearing is disposed in the bearing housing of the centrifugal pump body 6 and sleeved on the outside of the pump shaft 52. The shaft seal component 51 is disposed at the fitting gap between the pump shaft and the centrifugal pump body 6.

[0034] Specifically, the pump shaft 52 is a stepped shaft made of 40Cr alloy steel, with a total length of 650mm and a shaft diameter of φ42mm. It has undergone heat treatment to achieve a hardness of HRC28-32. The shaft seal component 51 adopts a type 108 mechanical seal with a sealing cavity pressure ≤1.6MPa and an applicable temperature of -20℃~120℃.

[0035] In the practical application of this embodiment, the centrifugal pump body 6 is a single-stage single-suction horizontal centrifugal pump. The top of the pump body is provided with a vertically upward inlet flange 61, and the side of the pump body is provided with a horizontal outlet flange 62. Multiple bolt connection holes 63 are provided on the end faces of the inlet flange 61 and the outlet flange 62, which are arranged equidistantly along the circumference.

[0036] Specifically, the centrifugal pump body 6 adopts the IS80-65-160 type single-stage single-suction horizontal centrifugal pump. The top inlet flange 61 of the centrifugal pump body 6 is a DN80 PN16 flange, and the side outlet flange 62 is a DN65 PN16 flange.

[0037] In the practical application of this embodiment, there are two sets of fluid delivery units. The drive motors 1 of the two sets of fluid delivery units are symmetrically arranged on the right side of the common mounting base 2, and the two sets of centrifugal pump bodies 6 are symmetrically arranged on the left side of the common mounting base 2. The inlet flanges 61 and outlet flanges 62 of the two sets of centrifugal pump bodies 6 are connected in parallel through pipes.

[0038] In the practical application of this embodiment, the drive motor 1 is a three-phase asynchronous motor. A square junction box 11 is provided on the top of the drive motor 1, a fan cover 12 with heat dissipation holes is provided at the rear end of the drive motor 1, and multiple mounting holes are provided at the bottom of the drive motor 1, which are fixedly connected to the common mounting base 2 by anchor bolts.

[0039] The drive motor 1 is a Y160M-4 type three-phase asynchronous motor with a rated power of 15kW, a rated speed of 1450r / min, and a rated voltage of 380V. The top of the drive motor 1 is equipped with a 200×200mm square junction box. The bottom of the drive motor 1 is equipped with 4 M16 mounting holes, which are fixedly connected to the common mounting base 2 by M16 anchor bolts.

[0040] The working principle of this invention is as follows: After the drive motor 1 is powered on, it outputs rotational power and transmits the torque to the pump shaft assembly 5 through the flexible coupling 3, which drives the pump shaft 52 and the inertial flywheel 4 to rotate synchronously. The pump shaft 52 drives the impeller inside the centrifugal pump body 6 to rotate at high speed, converting mechanical energy into the pressure energy and kinetic energy of the fluid, thereby realizing the pressurized delivery of the fluid. During the transmission process, the flexible coupling 3 uses the elastic deformation of the elastic body 33 to compensate for the coaxiality error and axial movement of the two shafts, while absorbing vibration to ensure smooth and efficient transmission.

[0041] Fluid enters the centrifugal pump body 6 through the inlet flange 61 at the top of the centrifugal pump body 6. The high-speed rotating impeller drives the fluid to make circular motion. Under the action of centrifugal force, the fluid is thrown to the edge of the impeller. After gaining pressure energy and kinetic energy, it is discharged from the outlet flange 62 on the side of the centrifugal pump body 6 and enters the conveying pipeline. The fluid is continuously sucked in and discharged under the action of the impeller, realizing continuous fluid delivery.

[0042] The dual-pump parallel system can flexibly switch operating modes according to the system's flow demand: when the system's flow demand is small, one set of conveying units can be started to operate independently, and the pump set will work in the high-efficiency range, avoiding the inefficient operation of large pumps with small flow rates; when the system's flow demand is large, both sets of conveying units can be started to operate together, doubling the flow rate to meet peak flow demand; the two sets of conveying units can serve as backups for each other, and when one set fails, the other set can continue to operate, ensuring continuous water supply to the system.

[0043] The inertial flywheel 4 rotates synchronously with the pump shaft 52, storing a certain amount of kinetic energy. When the pump unit starts, the drive motor 1 drives the inertial flywheel 4 to accelerate, and the inertial flywheel 4 stores kinetic energy, reducing the starting load of the drive motor 1 and reducing the starting current. When the system load suddenly increases, the inertial flywheel 4 releases the stored kinetic energy, and the drive motor 1 drives the pump shaft 52, avoiding overload of the drive motor 1. When the system load suddenly decreases, the inertial flywheel 4 absorbs the excess kinetic energy, preventing the pump shaft 52 speed from suddenly increasing and ensuring stable system operation. At the same time, the inertial flywheel 4 can effectively absorb water impact in the pipeline, protecting the centrifugal pump body 6 and the pipeline from damage.

[0044] This invention adopts an integrated design, with all components pre-installed on a common mounting base 2. On-site, only the inlet and outlet pipes and power supply need to be connected for it to be put into use, shortening the installation cycle. The equipment has a simple structure, few vulnerable parts, convenient maintenance, reduced annual maintenance costs, and significantly reduced total life cycle cost.

[0045] This invention can be configured with 2-4 sets of conveying units according to actual needs, adapting to conveying requirements of different flow levels; it can convey various fluids such as clean water, oil, and chemical media, and is widely used in water supply and drainage, chemical, petroleum, municipal and other fields, with strong versatility and scenario adaptability.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A high-efficiency fluid transport pump, characterized in that: Includes a shared mounting base (2) and at least two sets of fluid delivery units with identical structures; The fluid transport unit includes a drive motor (1), a flexible coupling (3), an inertial flywheel (4), a pump shaft assembly (5), and a centrifugal pump body (6). The bottom of the drive motor (1) is fixed to the upper surface of a common mounting base (2). The output shaft of the drive motor (1) is horizontally oriented towards the centrifugal pump body (6). The driving end of the flexible coupling (3) is coaxially fixedly connected to the output shaft of the drive motor (1), and the driven end of the flexible coupling (3) is coaxially fixedly connected to the input end of the pump shaft assembly (5). The inertial flywheel (4) is a disc-shaped structure and is coaxially fixedly sleeved on the middle shaft section of the pump shaft assembly (5). The output end of the pump shaft assembly (5) extends into the internal cavity of the centrifugal pump body (6) and is coaxially fixedly connected with the centrifugal pump body (6). The bottom of the centrifugal pump body (6) is fixed to the upper surface of the common mounting base (2) and located on the same side as the drive motor (1). At least two sets of fluid transport units are arranged symmetrically and parallel to each other along the length direction of the common mounting base (2) to form a multi-pump parallel fluid transport structure.

2. The high-efficiency fluid transport pump according to claim 1, characterized in that: The common mounting base (2) is a rectangular channel steel structure welded in one piece. The base has a cross-shaped reinforcing rib plate (21) welded inside. The upper surface of the base has multiple sets of bolt mounting holes adapted to the drive motor (1) and centrifugal pump body (6). The bottom edge of the base has a downwardly extending flange structure.

3. The high-efficiency fluid transport pump according to claim 1, characterized in that: The flexible coupling (3) includes a driving half coupling (31), a driven half coupling (32), and an elastic body (33); the driving half coupling (31) is fixedly connected to the output shaft of the drive motor (1), the driven half coupling (32) is coaxially fixedly connected to the input end of the pump shaft assembly (5), and the elastic body is embedded between the driving half coupling (31) and the driven half coupling (32).

4. The high-efficiency fluid transport pump according to claim 1, characterized in that: The inertial flywheel (4) has a disc-shaped structure. The center of the inertial flywheel (4) has a shaft hole and is fixedly connected to the middle shaft section of the pump shaft assembly (5) by a flat key. Locking nuts are provided on both sides of the inertial flywheel (4) and are threadedly connected to the pump shaft assembly (5) to achieve axial positioning of the inertial flywheel (4).

5. The high-efficiency fluid transport pump according to claim 1, characterized in that: The pump shaft assembly (5) includes a rolling bearing, a shaft seal component (51) and a pump shaft (52). The rolling bearing is located inside the bearing housing of the centrifugal pump body (6) and is sleeved on the outside of the pump shaft (52). The shaft seal component (51) is located at the mating gap between the pump shaft and the centrifugal pump body (6).

6. The high-efficiency fluid transport pump according to claim 1, characterized in that: The centrifugal pump body (6) is a single-stage single-suction horizontal centrifugal pump. The top of the pump body is provided with a vertically upward inlet flange (61), and the side of the pump body is provided with a horizontal outlet flange (62). Multiple bolt connection holes (63) are provided on the end faces of the inlet flange (61) and the outlet flange (62) along the circumference.

7. The high-efficiency fluid transport pump according to claim 6, characterized in that: The fluid delivery unit consists of two sets. The drive motors (1) of the two sets of fluid delivery units are symmetrically arranged on the right side of the common mounting base (2). The centrifugal pump bodies (6) are symmetrically arranged on the left side of the common mounting base (2). The inlet flanges (61) and outlet flanges (62) of the two sets of centrifugal pump bodies (6) are connected in parallel through pipelines.

8. The high-efficiency fluid transport pump according to claim 1, characterized in that: The drive motor (1) is a three-phase asynchronous motor. A square junction box (11) is provided on the top of the drive motor (1). A fan cover (12) with heat dissipation holes is provided at the rear end of the drive motor (1). Multiple mounting holes are provided at the bottom of the drive motor (1), and it is fixedly connected to the common mounting base (2) by anchor bolts.

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