Hybrid dry cooler for data centers

Abstract

The utility model discloses a mixed type dry cooler for data center, including dry -squeezing machine main part, dry -squeezing machine main part both sides are equipped with the air intake box, and the air intake box outer surface evenly sets up the air intake louvre, and inside installation wet film main part and sprinkler system, the inside of dry -squeezing machine main part is installed V type cooling coil, and the top is installed the exhaust fan, and the wet film main part below is equipped with wet film water tank and realizes circulation water supply through wet film water pump, and the sprinkler system includes water pipe, sprinkler pipe and atomizing nozzle, and water pipe and motor -driven carousel, connecting rod, slide and swing plate form linkage mechanism, make the reciprocating swing of realization of spraying, thereby guarantee the even spraying of V type cooling coil. The utility model discloses the combination operation mode through air cooling, wet film evaporation cooling and the spray evaporation cooling, effectively solved the traditional air cooling cooling effect is insufficient, and the problem that wet film is restricted by humidity and spraying unevenly covers, realized efficient, stable and energy -conserving cooling effect, is applicable to the temperature control demand of data center computer lab.

Description

Technical Field

[0001] This utility model belongs to the field of dry cooler technology, specifically relating to a hybrid dry cooler for data centers. Background Technology

[0002] As data centers continue to expand, the power consumption of servers and network equipment within the server room increases, generating a significant amount of heat during operation. To ensure stable equipment operation, an efficient cooling system is needed to dissipate this heat promptly. Currently, commonly used cooling methods mainly include air-cooled dry coolers and wet film assisted cooling. Traditional single-air-cooled dry coolers rely on heat exchange between ambient air and condenser pipes. While simple in structure, they are insufficiently effective in high-temperature summer conditions, often resulting in excessively high condensing temperatures and thus affecting the efficiency of the data center cooling system.

[0003] To improve cooling performance, some systems introduce wet film structures, which reduce the inlet air temperature through water evaporation to enhance heat exchange. However, existing wet film cooling methods typically have the following problems: First, the evaporation of water in the wet film relies on natural airflow, and the cooling effect is significantly limited by ambient humidity; when the humidity is high, it is difficult to achieve the expected cooling efficiency. Second, long-term operation of the wet film can lead to uneven humidification in certain areas, resulting in insufficient evaporation in some regions and affecting cooling stability. Third, existing wet film and spray systems often use fixed spray pipes for water distribution, leading to uneven spray coverage and potentially poor local heat exchange in the V-shaped cooling coil, thus reducing overall cooling performance.

[0004] In addition, some existing systems lack effective linkage control when switching between air-cooled and humidified cooling modes, which can easily lead to increased energy consumption. Furthermore, the water flow utilization rate of the sprinkler system is low, resulting in water waste. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a hybrid dry cooler for data centers, which ensures the basic heat dissipation capacity of air cooling while further improving the cooling uniformity and utilization rate of wet film and spray, thereby achieving energy saving and consumption reduction.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hybrid dry cooler for data centers includes a dry cooler body, the dry cooler body includes a support frame, a V-shaped cooling coil is installed on the inner side of the support frame, air inlet boxes are installed at the air inlets on both sides of the dry cooler body, air inlet louvers are evenly arranged on the outer surface of the air inlet boxes, and a wet film body is installed on the inner side of the air inlet boxes, the wet film body is used to reduce the temperature of the incoming air;

[0008] A spray system is installed on the inner side of the air inlet box. The spray system includes a water pipe that rotates horizontally above the inner side of the air inlet box, with one end of the water pipe rotatably connected to the water tank.

[0009] The water pipe surface is uniformly provided with spray pipes, and the spray pipe surface is uniformly provided with atomizing nozzles. The spray system is used to spray and cool the V-shaped cooling coil.

[0010] Furthermore, an exhaust fan is installed on the top of the dry cooler body, which is used to extract the gas inside the dry cooler body to form a circulating airflow.

[0011] Furthermore, a wet membrane water tank is provided at the bottom of the wet membrane body, and a wet membrane water pump is provided between the wet membrane body and the wet membrane water tank. The wet membrane water pump is used to transport water from inside the wet membrane water tank to the top of the wet membrane body.

[0012] Furthermore, the water pipe penetrates one side of the air inlet box, and a swing plate is provided on one side of the water pipe surface, with the swing plate positioned outside the air inlet box.

[0013] Furthermore, a protrusion is provided on the upper side of one side of the air inlet box, and a sliding rod is vertically slidably mounted on the surface of the protrusion, with the sliding rod positioned above the swing plate.

[0014] Furthermore, a U-shaped groove is formed on the surface of the swing plate, the slide rod passes through the U-shaped groove, and two limiting plates are provided at the bottom of the slide rod, with the two limiting plates respectively placed above the swing plate.

[0015] Furthermore, a support plate is provided on one side of the upper surface of the air inlet box, and a turntable is rotatably mounted on the outer side of the support plate, with one end of the turntable mounted on a motor.

[0016] Furthermore, the top of the slide bar is provided with a mounting head, and a connecting rod is hinged to the surface of the mounting head. The end of the connecting rod facing away from the mounting head is hinged to the turntable.

[0017] The connecting rod is eccentrically positioned relative to the turntable.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention, by installing an exhaust fan at the top of the dry cooler body, can promptly remove the high-temperature gas inside the support frame, creating a negative pressure inside the dry cooler body. This guides external air into the air inlet box and achieves initial cooling through the wet film body, ensuring the stability of the internal airflow and solving the problems of insufficient internal circulation and low heat exchange efficiency caused by local gas stagnation in traditional air-cooled structures.

[0020] This invention sets up a wet film body inside the air inlet box and combines it with a wet film water tank and a wet film water pump to form a circulating water supply, so that the water flow can be evenly distributed on the surface of the wet film body. When the outside air passes through the wet film, the evaporation effect reduces the air inlet temperature, which effectively improves the problem of insufficient cooling capacity of single air cooling in high-temperature environments. At the same time, the water flow is recycled and reused, reducing water waste.

[0021] This invention installs a spray system inside the air inlet box, using water pipes, spray pipes, and atomizing nozzles to atomize water and spray it evenly onto the surface of the V-shaped cooling coil. When air cooling and wet film cooling are insufficient, it can further reduce the coil temperature, thereby improving the overall heat exchange efficiency and solving the technical problem that the existing wet film cooling effect is limited in high humidity environments.

[0022] This invention utilizes a linkage mechanism consisting of a swing plate, a sliding rod, a limiting plate, a turntable, and a connecting rod. Driven by a motor, the water pipe reciprocates, expanding the spray coverage area and ensuring more uniform spraying of the V-shaped cooling coil. This avoids the problem of insufficient local heat exchange caused by existing fixed spraying methods, ensuring the stability and consistency of the cooling effect. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the cooling system connection structure of this utility model;

[0025] Figure 3 For the present utility model Figure 1 A schematic diagram of the cross-sectional structure;

[0026] Figure 4 This is a schematic diagram of the projectile structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the inner structure of the air inlet box of this utility model;

[0028] Figure 6 This is a front view structural diagram of the air inlet box of this utility model;

[0029] Figure 7 This is a schematic diagram of the spray pipe structure of this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Dry cooler main body; 11. Support frame; 12. V-shaped cooling coil; 13. Exhaust fan; 2. Air inlet box; 21. Air inlet louvers; 22. Support plate; 23. Protrusion; 3. Wet film main body; 31. Wet film water tank; 32. Wet film water pump; 4. Spray system; 41. Water pipe; 42. Spray pipe; 43. Swing plate; 44. U-shaped groove; 45. Slide rod; 46. Limiting plate; 47. Mounting head; 48. Turntable; 49. Connecting rod. Detailed Implementation

[0032] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0033] Example 1:

[0034] like Figures 1-7 As shown, a hybrid dry cooler for data centers includes a dry cooler body 1. The dry cooler body 1 includes a support frame 11 for overall support. A V-shaped cooling coil 12 for connecting with the air conditioner condenser pipe to form a cooling cycle is installed inside the support frame 11. Air inlet boxes 2 are installed at the air inlets on both sides of the dry cooler body 1. Air inlet louvers 21 that can adjust the air intake volume are evenly arranged on the outer surface of the air inlet box 2. A wet film body 3 is installed inside the air inlet box 2. The wet film body 3 is used to reduce the temperature of the air entering the dry cooler body 1 to enhance the cooling effect. Existing single air-cooled devices often cannot meet the heat dissipation requirements in high-temperature environments. Therefore, by configuring a wet film body 3 at the air inlet, the temperature of the incoming air can be significantly reduced by water evaporation, thereby improving the heat exchange capacity of the V-shaped cooling coil 12.

[0035] A spray system 4 is installed on the inner side of the air inlet box 2. The spray system 4 includes a water pipe 41 that rotates horizontally above the inner side of the air inlet box 2. One end of the water pipe 41 is rotatably connected to a water tank to supply water. Spray pipes 42 are evenly arranged on the surface of the water pipe 41. Multiple atomizing nozzles are evenly arranged on the surface of the spray pipes 42. The atomizing nozzles can atomize the water flow and spray it evenly on the surface of the V-shaped cooling coil 12. The spray system 4 is used to spray and cool the V-shaped cooling coil 12 when the air cooling and wet film cooling effects are insufficient. It further improves the cooling effect through evaporative heat exchange and solves the problem of uneven coverage of traditional fixed spray systems.

[0036] like Figure 1 and Figure 3As shown, an exhaust fan 13 is installed on the top of the dry cooler body 1. The exhaust fan 13 is used to draw the high-temperature gas inside the dry cooler body 1 upward to form an internal negative pressure, so that the external gas enters the dry cooler body 1 through the air inlet box 2 and the wet film body 3, thereby forming a stable circulating airflow. The exhaust fan 13 can avoid local gas stagnation, enhance air flow, improve the overall heat dissipation efficiency, and solve the problem of poor heat exchange effect caused by insufficient internal circulation in existing air coolers.

[0037] like Figure 2 and Figure 5 As shown, a wet membrane water tank 31 is provided at the bottom of the wet membrane body 3. The wet membrane water tank 31 is used to store circulating water. A wet membrane water pump 32 is provided between the wet membrane body 3 and the wet membrane water tank 31. The wet membrane water pump 32 is used to stably transport the water inside the wet membrane water tank 31 to the top of the wet membrane body 3, so that the water is evenly distributed on the surface of the wet membrane body 3. The inlet air temperature is reduced through evaporation. Excess water flows back into the wet membrane water tank 31 to achieve recycling, thereby effectively saving water resources and ensuring the long-term stability of the wet membrane cooling effect.

[0038] like Figures 5-7 As shown, the water pipe 41 penetrates one side of the air inlet box 2. A swing plate 43 is provided on one side of the surface of the water pipe 41. The swing plate 43 is placed outside the air inlet box 2. The function of the swing plate 43 is to realize the swing of the water pipe 41 through the mechanical structure, so that the spray pipe 42 can swing back and forth within a certain angle range, thereby improving the uniformity of the spray coverage and solving the problem of insufficient local heat exchange caused by the existing fixed spray.

[0039] like Figures 5-7 As shown, a protrusion 23 is provided on the upper side of one side of the air inlet box 2. A slide rod 45 is vertically slidably installed on the surface of the protrusion 23. The slide rod 45 passes through the upper area of ​​the swing plate 43. The up-and-down reciprocating movement of the slide rod 45 can drive the swing plate 43 to produce an angle change, thereby realizing the reciprocating swing of the water pipe 41 and enhancing the dynamics of the spray coverage.

[0040] like Figures 5-7 As shown, a U-shaped groove 44 is provided on the surface of the swing plate 43, and the slide rod 45 passes through the U-shaped groove 44. Two limiting plates 46 are provided at the bottom of the slide rod 45, and the two limiting plates 46 are respectively located above the swing plate 43. Through the cooperation between the limiting plates 46 and the U-shaped groove 44, the movement range of the slide rod 45 can be effectively controlled, avoiding excessive swing of the swing plate 43 from affecting the spraying accuracy, thereby maintaining the working stability of the spraying system 4.

[0041] like Figures 5-7As shown, a support plate 22 is provided on one side of the upper surface of the air inlet box 2. A turntable 48 is rotatably mounted on the outer side of the support plate 22. One end of the turntable 48 is mounted on a motor. The motor drives the turntable 48 to rotate, providing a power source for the reciprocating motion of the swing plate 43 and the water pipe 41. The support plate 22 can fix the motor and the turntable 48, ensuring the stability of the moving structure.

[0042] like Figures 5-7 As shown, a mounting head 47 is provided on the top of the slide rod 45, and a connecting rod 49 is hinged to the surface of the mounting head 47. The end of the connecting rod 49 away from the mounting head 47 is hinged to the turntable 48, and the connecting rod 49 and the turntable 48 are eccentrically set. When the turntable 48 rotates, the connecting rod 49 moves with the eccentric point, causing the slide rod 45 to move up and down reciprocally. The slide rod 45 then cooperates with the swing plate 43 to realize the reciprocating swing of the water pipe 41, and finally makes the spray pipe 42 spray reciprocally within a certain angle range, thereby ensuring that the spray coverage of the V-shaped cooling coil 12 is more uniform and effectively solving the defect of uneven coverage in traditional spray systems.

[0043] Example 2:

[0044] See Figures 1-7 This embodiment provides a hybrid dry cooler for data centers. During operation, the exhaust fan 13 is first started. The exhaust fan 13 is fixed on the top of the dry cooler body 1. During operation, it can quickly extract the high-temperature gas accumulated inside the support frame 11, forming a negative pressure state inside the dry cooler body 1, so that the external ambient air enters the dry cooler body 1 through the air inlet box 2. The air inlet louvers 21 evenly distributed on the outer surface of the air inlet box 2 can initially guide the airflow when the air enters, ensuring that the air is evenly distributed through the wet film body 3. The wet film body 3 is fixedly installed inside the air inlet box 2. When the wet film water pump 32 is started, the wet film body 3 receives water flow from the wet film water tank 31. The water flow is stably delivered to the top of the wet film body 3 by the wet film water pump 32 and is evenly distributed along the surface of the wet film body 3 to form a water film. When the high temperature air entering from the outside passes through the wet film body 3, it comes into full contact with the water film. The evaporation effect of water is used to reduce the air inlet temperature. The cooled air then enters the support frame 11 and exchanges heat with the V-shaped cooling coil 12 to remove the heat in the condensation pipe to achieve the cooling effect.

[0045] When the wet film cooling effect is insufficient, the spray system 4 can be started simultaneously. The spray system 4 includes a water pipe 41 that is rotatably installed above the air inlet box 2. One end of the water pipe 41 is connected to a water tank to achieve continuous water supply. Spray pipes 42 are evenly distributed on the outer surface of the water pipe 41. Multiple atomizing nozzles are provided on the surface of the spray pipes 42, which can atomize the water flow into fine water droplets and spray them evenly on the surface of the V-shaped cooling coil 12. Through evaporation, the surface temperature of the coil can be significantly reduced, further improving the heat exchange efficiency. In order to avoid uneven cooling caused by concentrated spraying in local areas, a swing plate 43 is provided on the outside of the water pipe 41. The swing plate 43, in cooperation with the slide rod 45, the limiting plate 46 and the U-shaped groove 44, achieves periodic swinging under the rotation of the turntable 48 and the eccentric drive of the connecting rod 49, so that the spray pipes 42 can move back and forth within a certain angle range, thereby ensuring more uniform spray coverage of the V-shaped cooling coil 12 and improving the overall cooling effect.

[0046] During system operation, the wet film body 3 and the spray system 4 can be activated in stages according to temperature requirements. When the ambient temperature is low, the air-cooling circulation alone is sufficient to meet the needs. When the outside temperature rises, the wet film pump 32 starts, reducing the inlet air temperature through wet film evaporation cooling. When the condensation temperature continues to rise, the spray system 4 starts, cooling the V-shaped cooling coil 12 through dynamic spraying. This staged operation not only ensures the cooling needs of the data center under different operating conditions but also effectively reduces water waste and energy consumption. The entire device, through the coordinated operation of the exhaust fan 13, the wet film pump 32, the motor, and the turntable 48, forms a hybrid cooling system with triple coupling of air cooling, wet film cooling, and spray cooling. This solves the problems of insufficient cooling efficiency, uneven spray coverage, and low water utilization of traditional single air cooling or fixed spray systems under high temperature and high humidity conditions.

[0047] Example 3:

[0048] See Figures 1-2 This embodiment provides a practical operating scheme for a hybrid dry cooler for data centers. The main body of the dry cooler is installed outdoors in the data center. Multiple sets of parallel heat exchange coils are installed inside the main body. The surface of the heat exchange coils is coated with a corrosion-resistant epoxy resin coating to resist the corrosion risks from spray water over the long term. A steel structure support frame is fixed to the outside of the main body to support the wet film assembly and spray assembly, while ensuring the stability of outdoor operation. Air inlet louvers are installed on both sides of the main body to regulate the airflow entering the dry cooler, and work in conjunction with the variable frequency exhaust fan at the top to form a stable airflow circulation.

[0049] During operation, when the control module detects that the coil water supply temperature has risen to 30℃, the PLC controller issues a command to activate the wet film assembly. The wet film assembly consists of two modified cellulose wet film plates, each 60mm thick. A solenoid valve controls the water supply pipeline, and the wet film pump evenly distributes water across the wet film surface. Air passing through the wet film experiences a dry-bulb temperature reduction of approximately 3-5℃ before entering the main body and exchanging heat with the heat exchange coil. If the outdoor dry-bulb temperature exceeds 35℃ at this time, the control module further activates the coil spray assembly. The spray pump operates at a pressure of 0.3MPa, driving the spray pipeline and atomizing nozzles at a speed of 5m. 3 A flow rate of / h is sprayed onto the surface of the heat exchange coil to form a uniform water film, thereby enhancing coil cooling through evaporation.

[0050] To avoid uneven spray coverage, the atomizing nozzles connected to the spray pipes are mounted on a swingable spray frame. The spray frame reciprocates via a motor-driven turntable, connecting rod, and sliding rod, allowing the atomizing nozzles to swing and spray within a certain angle range, thus ensuring uniform cooling of the coil surface. The control module collects the inlet and outlet water temperatures of the coil in real time. When the supply water temperature drops below 32℃, the spray system automatically adjusts to low flow operation to reduce water consumption.

[0051] Under extreme high-temperature conditions in summer (outdoor dry-bulb temperature 40°C, wet-bulb temperature 28°C), this embodiment reduces the coil water supply temperature from 35°C to 31°C through the synergistic effect of wet film and spraying. The downstream natural cooling type dual-coil water-cooled air conditioner switches from compressor refrigeration to "partial natural cooling" mode, reducing compressor energy consumption by about 55% and reducing the annual PUE to 1.18.

[0052] During the spring and autumn transition seasons (outdoor dry-bulb temperature around 15℃), the system only operates in natural heat exchange mode, without activating wet film and spraying, to avoid unnecessary energy and water consumption. When operating in water-scarce areas, the system can switch to water-saving mode, and the control module only activates spraying when the coil supply water temperature exceeds 32℃, with the average WUE controlled at 0.07L / kWh.

[0053] Through the above operating logic, this embodiment demonstrates the dynamic synergistic process of wet film cooling and spray cooling, effectively solving the problems of insufficient cooling or excessive water consumption in high-temperature environments caused by existing single air cooling or single spray methods, and realizing efficient, stable, energy-saving and water-saving operation of data center cooling systems under different operating conditions.

[0054] The working principle of this utility model is as follows: the air conditioning condenser pipe of the data center is connected to the V-shaped cooling coil 12 to form a cooling cycle. When the exhaust fan 13 is started, the high temperature gas inside the support frame 11 can be drawn upward. When a negative pressure is formed inside the dry cooler body 1, the external gas can enter the dry cooler body 1 through the air inlet box 2, thereby forming an air circulation and cooling.

[0055] When air cooling alone cannot meet the cooling effect, the wet film water pump 32 can be started to transport the water inside the wet film water tank 31 to the top of the wet film body 3 to humidify the wet film body 3. The temperature of the incoming air is reduced by the evaporation of water. Excess water will flow back down into the wet film water tank 31 to improve the cooling effect and save water.

[0056] When the V-shaped cooling coil 12 is at a relatively high stability, the wet film body 3 and the spray system 4 can be activated. The water pipe 41 is rotatably installed on the water tank, and the water flows through the spray pipe 42 and multiple atomizing spray pipes on its surface to spray the V-shaped cooling coil 12, thereby spraying the V-shaped cooling coil 12 and further improving the cooling effect through evaporation. At the same time, the motor can be activated to control the rotation of the turntable 48. Because the connection end between the turntable 48 and the connecting rod 49 is eccentric, the slide rod 45 can be driven to move up and down reciprocally when the turntable 48 rotates. Then, through the cooperation of the limiting plate 46 and the U-shaped groove 44, the swing plate 43 is controlled to swing back and forth, which in turn controls the water pipe 41 to swing, thereby controlling the spray pipe 42 to swing back and forth within a certain angle, improving the uniformity of spraying onto the V-shaped cooling coil 12 and ensuring the cooling effect.

[0057] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A hybrid dry cooler for data centers, comprising a dry cooler body (1), characterized in that: The dry cooler body (1) includes a support frame (11), a V-shaped cooling coil (12) is installed inside the support frame (11), and air inlet boxes (2) are installed at the air inlets on both sides of the dry cooler body (1). Air inlet louvers (21) are evenly arranged on the outer surface of the air inlet box (2). A wet film body (3) is installed inside the air inlet box (2). The wet film body (3) is used to reduce the temperature of the incoming air. A spray system (4) is installed on the inner side of the air inlet box (2). The spray system (4) includes a water pipe (41) that rotates horizontally above the inner side of the air inlet box (2). One end of the water pipe (41) is rotatably connected to the water tank. The water pipe (41) is uniformly provided with spray pipes (42), and the spray pipes (42) are uniformly provided with atomizing nozzles. The spray system (4) is used to spray and cool the V-shaped cooling coil (12).

2. The hybrid dry cooler for data centers according to claim 1, characterized in that: The dry cooler body (1) is equipped with an exhaust fan (13) on top. The exhaust fan (13) is used to extract the gas inside the dry cooler body (1) to form a circulating airflow.

3. A hybrid dry cooler for data centers according to claim 1, characterized in that: The bottom of the wet membrane body (3) is provided with a wet membrane water tank (31), and a wet membrane water pump (32) is provided between the wet membrane body (3) and the wet membrane water tank (31). The wet membrane water pump (32) is used to transport water inside the wet membrane water tank (31) to the top of the wet membrane body (3).

4. A hybrid dry cooler for data centers according to claim 1, characterized in that: The water pipe (41) penetrates one side of the air inlet box (2), and a swing plate (43) is provided on one side of the surface of the water pipe (41). The swing plate (43) is placed outside the air inlet box (2).

5. A hybrid dry cooler for data centers according to claim 4, characterized in that: A protrusion (23) is provided on the upper side of one side of the air inlet box (2), and a slide rod (45) is vertically slidably installed on the surface of the protrusion (23), and the slide rod (45) is placed above the swing plate (43).

6. A hybrid dry cooler for data centers according to claim 5, characterized in that: The surface of the swing plate (43) is provided with a U-shaped groove (44), the slide rod (45) passes through the U-shaped groove (44), and two limiting plates (46) are provided at the bottom of the slide rod (45), with the two limiting plates (46) respectively placed above the swing plate (43).

7. A hybrid dry cooler for data centers according to claim 6, characterized in that: A support plate (22) is provided on one side of the upper surface of the air inlet box (2), and a turntable (48) is rotatably installed on the outer side of the support plate (22). One end of the turntable (48) is installed on the motor.

8. A hybrid dry cooler for data centers according to claim 7, characterized in that: The top of the slide bar (45) is provided with a mounting head (47), and a connecting rod (49) is hinged to the surface of the mounting head (47). The end of the connecting rod (49) away from the mounting head (47) is hinged to the turntable (48). The connecting rod (49) is eccentrically positioned relative to the turntable (48).

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