Unit for high-efficiency large-series pressure-bearing heat pump hot water engineering

Abstract

The utility model relates to the technical field of pressure-bearing heat pump hot water, and discloses an efficient large series pressure-bearing heat pump hot water engineering unit which comprises a mounting table, a control box is fixedly connected to the upper surface of the mounting table, a connecting plate is fixedly connected to the outer wall of the control box, and a heater is fixedly connected to the inner wall of the connecting plate. A heating water tank is fixedly connected to the outer wall of the heater, a second water passing pipe is fixedly connected to the inner wall of the heating water tank, a first heat storage water tank is fixedly connected to the outer wall of the second water passing pipe, and a first water passing pipe is fixedly connected to the inner wall of the first heat storage water tank. According to the utility model, when the water temperature does not reach the standard regulation, water in the water replenishing tank is conveyed into the heating water tank through the water return pump and the water return pipe to be heated again, so that the heating water tank and the water replenishing tank are separately designed, the stable supply of hot water is guaranteed, and the use efficiency of the hot water is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pressure-bearing heat pump hot water, especially to a high -efficient big series pressure -bearing heat pump hot water engineering unit. BACKGROUND

[0002] Pressure-bearing heat pump, also known as air source heat pump, is a kind of equipment that uses low-temperature heat source (such as heat energy in air) to improve heat through mechanical compression cycle and converts it into high-temperature heat. Its basic working principle relies on thermodynamic cycle, which specifically includes four main stages of evaporation, compression, condensation and expansion.

[0003] Evaporation stage: In this stage, low-temperature and low-pressure refrigerant (usually a special gas such as R-410A) exchanges heat with the outside air through the evaporator. The heat in the external air is absorbed into the refrigerant, causing it to evaporate and convert into a gaseous state.

[0004] Compression stage: The gaseous refrigerant is compressed by the compressor, and the pressure and temperature rise rapidly. Due to the physical properties of the compression process, the gas molecules obtain higher energy after compression.

[0005] Condensation stage: High-temperature and high-pressure gas enters the condenser, where the refrigerant transfers its heat to water or air through the heat exchanger, causing the refrigerant to condense into a liquid state. The heat generated in this process is used for heating or hot water supply.

[0006] Expansion stage: High-pressure liquid refrigerant flows into the low-pressure area through the expansion valve, and the gas expands and rapidly lowers the temperature, preparing to enter the evaporator again for circulation.

[0007] Through these four steps, the heat pump system continuously works in a cycle, converting low-temperature heat energy in the air into high-temperature heat energy, providing effective heating services for buildings or industrial facilities.

[0008] Pressure-bearing heat pumps have been widely used in many fields, and their advantages mainly lie in the following aspects:

[0009] High efficiency conversion rate: Pressure-bearing heat pumps have a significant advantage in high efficiency compared to traditional electric heaters, gas boilers and other heating equipment. Traditional electric heaters directly convert electrical energy into heat energy, with an efficiency of 100%, while gas boilers obtain heat by burning fossil fuels such as natural gas, with a higher efficiency, but still with some energy loss. The heating efficiency of pressure-bearing heat pumps is usually 300% to 500%, i.e. consuming 1kWh of electricity, it can obtain 3-5kWh of heat output. Therefore, the energy efficiency of pressure-bearing heat pumps is much higher than other traditional heating equipment.

[0010] Energy-saving and Environment-friendly: Since the pressure heat pump mainly uses the low-temperature heat energy in the air as the heat source, it does not rely on fossil energy (such as coal, oil, and natural gas), so its operation process has less impact on the environment and can significantly reduce carbon dioxide emissions. This makes the pressure heat pump an environmentally friendly heating device. Especially in the context of the increasingly serious global climate change problem, using low-carbon and environmentally friendly heating methods is of great significance to reducing greenhouse gas emissions.

[0011] Reducing energy consumption and cost: The pressure heat pump greatly reduces energy consumption through an effective energy conversion mechanism. According to different regional and energy market conditions, the pressure heat pump system can bring significant energy-saving effects to families or businesses. In many countries and regions, electricity prices are relatively low, and the electricity required by the pressure heat pump is only one-third to one-fifth of that of traditional electric heaters, so it can effectively reduce the cost of winter heating electricity bills. At the same time, in the long run, the pressure heat pump can also save a large amount of heating costs through its low energy consumption characteristics.

[0012] The pressure heat pump not only can be used for heating, but also can be used for providing hot water, and even providing cooling function in summer, with high adaptability and flexibility. This makes the pressure heat pump system work continuously in all seasons, maximizing the needs of different users. For families, a heat pump device can not only provide heating needs in winter, but also provide cooling function in summer, and even supply hot water all year round, avoiding repeated investment in different devices.

[0013] Compared with traditional boilers and air conditioning equipment, the working principle of the pressure heat pump system is relatively simple, and its main components such as compressors, expansion valves, and evaporators have a long service life. Generally, the service life of the pressure heat pump can reach 15-20 years, and the maintenance cost is low under normal use conditions. Only regular cleaning and inspection are required to avoid equipment efficiency decline due to excessive dust or corrosion, so the operation and maintenance costs can be reduced in the long-term use process.

[0014] The pressure heat pump is widely used in heating, cooling, and hot water supply, and other fields, especially in the context of increasing demand for energy-saving and environmentally friendly and low-carbon buildings today, the application prospect of the pressure heat pump is more promising.

[0015] In family life, the pressure heat pump is often used as the main heating method in modern energy-saving homes. Especially in cold winter areas, the pressure heat pump not only provides comfortable indoor temperature, but also provides stable hot water supply for the family. In addition, with the development of smart home and Internet of Things technology, the combination of the pressure heat pump and the intelligent control system also makes its use more convenient, and users can remotely control the operation status of the device through the mobile phone APP, improving energy utilization efficiency.

[0016] In commercial buildings and industrial fields, pressure-bearing heat pump systems are also widely used. For example, many office buildings, hotels, large shopping malls and factories have begun to use pressure-bearing heat pumps as the main equipment for air conditioning and heating systems. Especially in the case of high energy cost pressure, pressure-bearing heat pumps save a lot of heating and cooling costs for enterprises. In addition, pressure-bearing heat pumps can also be used in combination with other energy systems (such as solar energy) to further optimize energy management and improve the overall efficiency of energy use.

[0017] In the field of agriculture, pressure-bearing heat pumps are used for heating and cooling in greenhouse sheds. Since the temperature and humidity inside the greenhouse are crucial for crop growth, pressure-bearing heat pump systems can effectively regulate the temperature and humidity in the greenhouse environment to ensure that crops grow in the best conditions, while saving energy and reducing dependence on traditional heating and air conditioning equipment.

[0018] Pressure-bearing heat pump systems can not only be used for heating, but also often be used to provide hot water supply. Whether it is a family, a hotel or an industrial enterprise, high-efficiency hot water service can be provided by using a heat pump. Especially in places where a large amount of hot water is needed (such as hotels, hospitals, etc.), pressure-bearing heat pumps can provide hot water supply all day long, with high energy efficiency ratio, reducing the cost of hot water supply.

[0019] As a high-efficiency and environmentally friendly heating technology, pressure-bearing heat pumps are gradually replacing traditional electric heaters, gas boilers and other equipment, becoming the main choice for modern energy-saving buildings and low-carbon life. With the continuous progress of technology and the increasing market demand, pressure-bearing heat pumps will play an important role in future energy transformation and make positive contributions to the sustainable development of global energy.

[0020] The traditional pressure-bearing heat pump hot water engineering unit has a simple structure design and low cost, which is easy to mass produce. However, the traditional pressure-bearing heat pump hot water engineering unit has a compact structure, and the heating tank and the water supplement tank are fixed together, which may cause great disturbance to the heating water temperature during the water supplement process, especially in the case of high demand for hot water and frequent water supplement. This disturbance will be more obvious, making it difficult to provide stable hot water supply and affecting the efficiency of hot water use. SUMMARY

[0021] In order to make up for the above shortcomings, the utility model provides a kind of high-efficiency large series pressure-bearing heat pump hot water engineering unit, to improve the traditional pressure-bearing heat pump hot water engineering unit heating tank and the water supplement tank are fixed together, it is difficult to guarantee the stable supply of hot water, and the problem of affecting the efficiency of hot water use.

[0022] To achieve the above purpose, the utility model provides the following technical scheme:

[0023] The utility model provides a kind of efficient large series pressure-bearing heat pump hot water engineering unit, including installation platform, the upper surface of the installation platform is fixedly connected with control box, the outer wall of the control box is fixedly connected with connecting plate, the inner wall of the connecting plate is fixedly connected with heater, the outer wall of the heater is fixedly connected with heating water tank, the inner wall of the heating water tank is fixedly connected with second water pipe, the outer wall of the second water pipe is fixedly connected with first heat storage water tank, the inner wall of the first heat storage water tank is fixedly connected with first water pipe, the outer wall of the first water pipe is fixedly connected with second heat storage water tank, the inner wall of the second heat storage water tank is fixedly connected with connecting pipe, the outer wall of the connecting pipe is fixedly connected with water replenishing tank, the upper surface of the installation platform is provided with support assembly.

[0024] Further, the support assembly includes a support frame, the lower surface of the support frame is fixedly connected to the upper surface of the installation platform, the inner wall of the support frame is fixedly connected with a return water pipe, and the outer wall of the support frame is fixedly connected with a return water pump.

[0025] Further, the lower surface of the heating water tank is fixedly connected to the upper surface of the installation platform, and the lower surface of the first heat storage water tank is fixedly connected to the upper surface of the installation platform.

[0026] Further, the lower surface of the second heat storage water tank is fixedly connected to the upper surface of the installation platform, and the lower surface of the water replenishing tank is fixedly connected to the upper surface of the installation platform.

[0027] Further, the inner wall of the second water pipe is fixedly connected with a bottom plate, the outer wall of the bottom plate is provided with a transmission assembly, the inner wall of the transmission assembly is rotatably connected with a transmission arm, and the outer wall of the transmission arm is rotatably connected with a fan blade.

[0028] Further, the transmission assembly includes a swivel ring, the inner wall of the swivel ring is slidably connected to the outer wall of the bottom plate, and the outer wall of the swivel ring is fixedly connected with a handle.

[0029] Further, the inner wall of the bottom plate is slidably connected with a limiting column, and the outer wall of the limiting column is arranged on the outer wall of the transmission arm.

[0030] Further, the outer wall of the fan blade is slidably connected to the outer wall of the bottom plate.

[0031] The design idea of the high-efficiency large-series pressure-bearing heat pump hot water engineering unit of the present application mainly focuses on how to realize efficient hot water heating, heat storage and water recycling, ensure stable operation, energy saving and high efficiency, and facilitate maintenance and operation. The specific design ideas mainly include the following aspects:

[0032] 1. System integration and modular design

[0033] Integration: This design integrates multiple key components onto a single mounting platform, using a unified mounting base to connect the various functional modules. This design simplifies the installation process, reduces system complexity, and provides better structural stability.

[0034] Modular design: Each component, such as the heater, hot water tank, hot water storage tank, and return water pump, can be designed and manufactured independently as a module, facilitating individual testing, replacement, or maintenance.

[0035] 2. Heat transfer and storage

[0036] Heater and hot water tank: The heater and hot water tank work together to efficiently heat the water source, with the tank providing heat storage. The heater raises the water temperature in the tank to meet subsequent hot water demand.

[0037] Series-connected hot water storage tank design: By setting up a first hot water storage tank and a second hot water storage tank in series, multi-stage heat storage can be achieved, ensuring that the system can store sufficient heat. This series design helps to increase the system's heat capacity and reduce heat loss.

[0038] Water pipe design: The combination of heating water tank, hot water storage tank and water pipe ensures smooth water flow, and at the same time enables water exchange and heat transfer in different heat storage areas.

[0039] 3. Circulation and return water system

[0040] Return water pipe and return water pump: The return water pipe and return water pump in the support assembly form a closed loop, ensuring continuous water circulation during the heating process. Driven by the return water pump, the returned cold water is sent back into the heating system, realizing a continuous supply and recovery of hot water.

[0041] Energy-saving design: The return water system effectively recovers heated water, reducing heat loss and improving the system's energy efficiency. Especially in high-efficiency heat pump systems, the return water pipeline reduces energy waste and saves operating costs.

[0042] 4. Automation control and transmission components

[0043] Transmission components and fan blade design: The transmission components and fan blade design on the base plate enhance water circulation, especially the rotating fan blades which increase water flow velocity and promote rapid heat transfer. The combination of the transmission arm and fan blades effectively improves hot water circulation efficiency and further optimizes the heat exchange process.

[0044] Rotary ring and limit post design: The rotating ring can adjust the movement of the fan blades, further controlling the speed and direction of the water flow. The limit post ensures that the drive arm moves within a predetermined trajectory, avoiding excessive deviation or uneven movement.

[0045] 5. Equipment protection and safety design

[0046] The role of the water replenishment tank: The water replenishment tank is designed to allow the system to automatically replenish water, ensuring that there is no shortage of water during long-term operation, and preventing equipment failure due to insufficient water.

[0047] Stable installation and support: The support frame and support assembly provide stability to the equipment, allowing all components to function normally under vibration or external forces, while the design of the support assembly facilitates maintenance and repair of the equipment.

[0048] 6. Optimized water flow and heat transfer path

[0049] Water flow path design: The arrangement of the second water pipe, the first heat storage tank and other water storage tanks ensures that water can flow and exchange heat during heating and heat storage. The optimization of the water flow path helps to reduce energy loss and improve heat exchange efficiency.

[0050] 7. Easy maintenance and operation

[0051] Convenient structure design: Through modular design and clear separation between components, maintenance and repair are facilitated. In particular, the transmission assembly, return water system and other components can be individually inspected and replaced, reducing system downtime and improving system reliability and long-term operation efficiency.

[0052] The design of the heat pump water heater combines hot water heating, heat storage, water circulation, transmission and other functions, and optimizes the performance of the entire system through modularization, series heat storage design, circulating water system, automation control and other methods, aiming to improve energy utilization efficiency, ensure continuous and stable hot water supply, and have high maintenance convenience. In addition, the design of the fan blade and transmission assembly can enhance heat transfer and further improve the efficiency of the heat pump. This design reflects the high pursuit of energy saving, efficiency and reliability in modern engineering.

[0053] The utility model has the following beneficial effects:

[0054] 1、In the utility model, after the hot water heated by the heater is delivered to the water replenishment tank through the first heat storage tank and the second heat storage tank, the water replenishment tank detects the water temperature, and when the water temperature does not reach the standard, the water in the water replenishment tank is delivered to the heating tank through the return water pump and the return water pipe for re-heating, thereby realizing the effect of separating the heating tank and the water replenishment tank, ensuring stable hot water supply, and improving hot water use efficiency.

[0055] 2、 The utility model discloses, need to drain water first pull out the limiting column and then rotate the handle, and the handle will drive the swivel ring synchronous rotation when rotating, and when the swivel ring rotates, will drive transmission arm to rotate, and further drive the fan blade to rotate, and then realize the effect that rotating handle fast opening fan blade and draining water. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 A kind of high-efficiency large series pressure-bearing heat pump hot water engineering unit's three-dimensional structure schematic diagram is proposed for the utility model;

[0057] Figure 2 A kind of high-efficiency large series pressure-bearing heat pump hot water engineering unit's control box partial structure schematic diagram is proposed for the utility model;

[0058] Figure 3 A kind of high-efficiency large series pressure-bearing heat pump hot water engineering unit's return water pump partial structure schematic diagram is proposed for the utility model;

[0059] Figure 4 A kind of high-efficiency large series pressure-bearing heat pump hot water engineering unit's limiting column partial structure schematic diagram is proposed for the utility model;

[0060] Legend:

[0061] 1, installation platform;2, control box;3, connecting plate;4, heater;5, heating water tank;6, first hot water storage tank;7, first water pipe;8, second hot water storage tank;9, connecting pipe;10, water supplement tank;11, return water pipe;12, support frame;13, return water pump;14, bottom plate;15, swivel ring;16, handle;17, transmission arm;18, fan blade;19, limiting column;20, second water pipe. DETAILED DESCRIPTION

[0062] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings of the specification of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0063] Reference Figures 1-3The utility model provides a kind of embodiment: a kind of efficient large series pressure-bearing heat pump hot water engineering unit, including installation platform 1, the upper surface of installation platform 1 is fixedly connected with control box 2, the outer wall of control box 2 is fixedly connected with connecting plate 3, the inner wall of connecting plate 3 is fixedly connected with heater 4, the outer wall of heater 4 is fixedly connected with heating water tank 5, the inner wall of heating water tank 5 is fixedly connected with second water pipe 20, the outer wall of second water pipe 20 is fixedly connected with first heat storage water tank 6, the inner wall of first heat storage water tank 6 is fixedly connected with first water pipe 7, the outer wall of first water pipe 7 is fixedly connected with second heat storage water tank 8, the inner wall of second heat storage water tank 8 is fixedly connected with connecting pipe 9, the outer wall of connecting pipe 9 is fixedly connected with water replenishing tank 10, the upper surface of installation platform 1 is provided with support assembly;

[0064] Specifically, installation platform 1 is used for supporting control box 2, heating water tank 5, first heat storage water tank 6, second heat storage water tank 8 and water replenishing tank 10, heater 4 is used for heating water source, first water pipe 7 is used for connecting first heat storage water tank 6 and second heat storage water tank 8, and connecting pipe 9 is used for connecting second heat storage water tank 8 and water replenishing tank 10.

[0065] Referring to Figure 1 and Figure 3 , the support assembly includes support frame 12, the lower surface of support frame 12 is fixedly connected to the upper surface of installation platform 1, the inner wall of support frame 12 is fixedly connected with return water pipe 11, the outer wall of support frame 12 is fixedly connected with return water pump 13, and the outer wall of return water pump 13 is fixedly connected to the inner wall of return water pipe 11; the lower surface of heating water tank 5 is fixedly connected to the upper surface of installation platform 1, and the lower surface of first heat storage water tank 6 is fixedly connected to the upper surface of installation platform 1; the lower surface of second heat storage water tank 8 is fixedly connected to the upper surface of installation platform 1, and the lower surface of water replenishing tank 10 is fixedly connected to the upper surface of installation platform 1.

[0066] Specifically, support frame 12 is used for supporting return water pipe 11 and return water pump 13, return water pipe 11 and return water pump 13 cooperate with each other to deliver water in water replenishing tank 10 to heating water tank 5, thereby realizing that heating water tank 5 and water replenishing tank 10 are separated, water temperature is stable, and the effect of improving hot water use efficiency is achieved.

[0067] Referring to Figure 3 and Figure 4 , the inner wall of second water pipe 20 is fixedly connected with bottom plate 14, the outer wall of bottom plate 14 is provided with transmission assembly, the inner wall of transmission assembly is rotatably connected with transmission arm 17, and the outer wall of transmission arm 17 is rotatably connected with fan blade 18; the transmission assembly includes rotating ring 15, the inner wall of rotating ring 15 is slidably connected to the outer wall of bottom plate 14, the outer wall of rotating ring 15 is fixedly connected with handle 16; the inner wall of bottom plate 14 is slidably connected with limiting column 19, and the outer wall of limiting column 19 is arranged on the outer wall of transmission arm 17; the outer wall of fan blade 18 is slidably connected to the outer wall of bottom plate 14.

[0068] Specifically, pull out the limiting column 19, rotate the handle 16, through the fixed effect of the handle 16 and the rotating ring 15, the rotating ring 15 will be driven to rotate, the rotating ring 15 rotates to drive the transmission arm 17 to rotate, the transmission arm 17 rotates to drive the fan blade 18 to rotate on the outer wall of the bottom plate 14, thereby realizing the effect of rotating the handle 16 and quickly discharging water.

[0069] Working principle: the hot water engineering unit, through the control box 2 controls the heater 4 to heat the water source, through the second water pipe 20, the water in the heating water tank 5 is sent to the first heat storage water tank 6, the water in the first heat storage water tank 6 is sent to the second heat storage water tank 8 through the first water pipe 7, the water in the second heat storage water tank 8 is sent to the water supplement tank 10 through the connecting pipe 9, when the temperature does not reach the standard, the water in the water supplement tank 10 will be returned to the heating water tank 5 under the cooperation of the backwater pump 13 and the backwater pipe 11, through the separate design of the heating water tank 5 and the water supplement tank 10, the water temperature is stable, thereby improving the hot water use efficiency; when water needs to be discharged, first pull out the limiting column 19, after pulling out the limiting column 19, rotate the handle 16, the handle 16 rotates to drive the rotating ring 15 to rotate on the outer wall of the bottom plate 14, the rotating ring 15 rotates to drive the transmission arm 17 to rotate, the transmission arm 17 rotates to drive the fan blade 18 to rotate on the outer wall of the bottom plate 14, thereby achieving the effect of quickly opening the fan blade 18 to discharge water, finally, the hot water engineering unit not only can improve the hot water use efficiency through the separate design of the heating water tank 5 and the water supplement tank 10, but also can achieve the effect of quickly opening the fan blade 18 to discharge water through rotating the handle 16.

[0070] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A high-efficiency, large-series pressurized heat pump unit for hot water engineering, comprising an installation platform (1), characterized in that: A control box (2) is fixedly connected to the upper surface of the mounting platform (1). A connecting plate (3) is fixedly connected to the outer wall of the control box (2). A heater (4) is fixedly connected to the inner wall of the connecting plate (3). A heating water tank (5) is fixedly connected to the outer wall of the heater (4). A second water pipe (20) is fixedly connected to the inner wall of the heating water tank (5). A first hot water storage tank (6) is fixedly connected to the outer wall of the second water pipe (20). A first water pipe (7) is fixedly connected to the inner wall of the first hot water storage tank (6). A second hot water storage tank (8) is fixedly connected to the outer wall of the first water pipe (7). A connecting pipe (9) is fixedly connected to the inner wall of the second hot water storage tank (8). A water replenishment tank (10) is fixedly connected to the outer wall of the connecting pipe (9). A support assembly is provided on the upper surface of the mounting platform (1).

2. The high-efficiency large-series pressurized heat pump water heating system according to claim 1, characterized in that: The support assembly includes a support frame (12), the lower surface of which is fixedly connected to the upper surface of the mounting platform (1), a return water pipe (11) is fixedly connected to the inner wall of the support frame (12), and a return water pump (13) is fixedly connected to the outer wall of the support frame (12), with the outer wall of the return water pump (13) fixedly connected to the inner wall of the return water pipe (11).

3. The high-efficiency large-series pressurized heat pump water heating system according to claim 1, characterized in that: The lower surface of the heating water tank (5) is fixedly connected to the upper surface of the mounting platform (1), and the lower surface of the first hot water storage tank (6) is fixedly connected to the upper surface of the mounting platform (1).

4. The high-efficiency large-series pressurized heat pump water heating system according to claim 1, characterized in that: The lower surface of the second hot water storage tank (8) is fixedly connected to the upper surface of the mounting platform (1), and the lower surface of the water replenishment tank (10) is fixedly connected to the upper surface of the mounting platform (1).

5. The high-efficiency large-series pressurized heat pump water heating system according to claim 1, characterized in that: The inner wall of the second water pipe (20) is fixedly connected to a base plate (14), and the outer wall of the base plate (14) is provided with a transmission assembly. The inner wall of the transmission assembly is rotatably connected to a transmission arm (17), and the outer wall of the transmission arm (17) is rotatably connected to a fan blade (18).

6. The high-efficiency large-series pressurized heat pump water heating system according to claim 5, characterized in that: The transmission assembly includes a rotating ring (15), the inner wall of which is slidably connected to the outer wall of the base plate (14), and a handle (16) is fixedly connected to the outer wall of the rotating ring (15).

7. The high-efficiency large-series pressurized heat pump water heating system according to claim 5, characterized in that: The inner wall of the base plate (14) is slidably connected to a limiting post (19), and the outer wall of the limiting post (19) is set on the outer wall of the transmission arm (17).

8. The high-efficiency large-series pressurized heat pump water heating system according to claim 5, characterized in that: The outer wall of the fan blade (18) is slidably connected to the outer wall of the base plate (14).

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