A soil source heat pump buried pipe structure

Abstract

The utility model discloses a kind of soil source heat pump pipe-burying structures, including base, it is characterized by: the base is evenly provided with through hole along its length direction, support block is fixedly arranged on the base near one side position, transmission barrel is connected in the top of support block, water outlet interface is equipped in the transmission barrel one side near bottom position, filter is installed in the end inside of water outlet interface, heater base is equipped in the middle position of transmission barrel inner wall, heater is connected on the heater base, the heater is armored structure, exhaust port is equipped in the middle position of transmission barrel top, water inlet interface is equipped in the transmission barrel one side near top position, water collector and water distributor are side by side arranged on the side of base far from transmission barrel upper side. The structure described in the working principle, can realize fluid ordered delivery, temperature control, filtration and real-time monitoring, guarantee soil source heat pump pipe-burying system stable and efficient operation.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, specifically to a soil source heat pump buried pipe structure. Background Technology

[0002] With the increasing global energy shortage and environmental problems, the application of traditional fossil fuels (coal and natural gas) in building heating / cooling faces the dual challenges of "high energy consumption and high pollution." According to data from the "Annual Development Research Report on Building Energy Conservation in China," building energy consumption accounts for more than 30% of total social energy consumption, with heating and cooling energy consumption accounting for over 50%. Soil source heat pump systems, as a renewable energy utilization technology, rely on the stable temperature (typically 10-20℃) of the soil near the surface (10-100m depth) throughout the year. Through a buried pipe structure, heat exchange is achieved between the soil and the system, resulting in energy savings of 30%-50% and carbon emissions reduction of over 40% compared to traditional air conditioning systems.

[0003] Traditional buried pipe structures lack real-time monitoring of the buried pipe's operating status (such as fluid temperature, pressure, flow rate, and soil temperature field changes), and cannot dynamically adjust system operating parameters (such as variable frequency pump speed and main unit start-up and shutdown) according to actual working conditions, resulting in energy waste and system losses. Utility Model Content

[0004] The purpose of this utility model is to provide a soil source heat pump buried pipe structure to solve the problem that the traditional buried pipe structure mentioned in the background art lacks real-time monitoring of the buried pipe's operating status (such as the temperature, pressure, and flow rate of the fluid inside the pipe, and changes in the soil temperature field), and cannot dynamically adjust the system operating parameters (such as the speed of the variable frequency water pump and the start-up and shutdown of the main unit) according to the actual working conditions, resulting in energy waste and system loss.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a soil source heat pump buried pipe structure, including a base, on which through holes are evenly distributed along its length. A support block is fixedly installed on the base near one side, and a transmission tank is connected to the top of the support block. A water outlet is provided on one side of the transmission tank near the bottom, and a filter is installed on the inner side of the end of the water outlet. A heater base is provided in the middle of the inner wall of the transmission tank, and a heater is connected to the heater base. The heater has an armored structure. An exhaust port is provided in the middle of the top of the transmission tank. A water inlet is provided on one side of the transmission tank near the top. A water collector and a water distributor are arranged side by side on the side of the base away from the transmission tank. A buried pipe interface is provided on the side wall of the water collector, and the buried pipe interface is connected to an external buried pipe. A water collector cover covers the opening at the top of the water dispenser. A buried pipe interface is located on the side wall of the water distributor, connecting to an external buried pipe. A water distributor cover covers the opening at the top of the water distributor. A horizontal plate connects the top edges of the water collector cover and the water distributor cover. Fixing screws are inserted at the connection points of the horizontal plate to the water collector cover and the water distributor cover at both ends. A vertical plate is vertically connected to the lower surface of the middle of the horizontal plate. The bottom of the vertical plate is welded to the middle of the upper surface of the base. A connecting arm is connected to the base near the other edge. A monitoring box is connected to the end of the connecting arm away from the base. A monitoring panel is located on the upper part of the monitoring box, and an operation button is located below the monitoring panel. The inside of the monitoring box is electrically connected to the wiring terminals of the heater, the control terminal of the external variable frequency water pump, and the signal terminal of the main unit via wires.

[0006] Preferably, the base is a plate-shaped structure with through holes evenly distributed along the length of the base, penetrating the upper and lower surfaces of the base. The support block is located on one side of the upper surface of the base, and the bottom of the support block is connected to the upper surface of the base by bolts. The filter is installed on the inner side of the end of the water outlet, and the outer ring of the filter fits against the inner wall of the water outlet. The outer ring of the filter screen frame is provided with external threads, which cooperate with the internal threads of the inner wall of the water outlet to achieve fixation.

[0007] Preferably, the heater base is disposed inside the transfer barrel and fits against the inner wall of the transfer barrel. The heater is snapped into the slot in the middle of the heater base, and the outer wall of the heater fits against the inner wall of the slot. The exhaust port is disposed in the middle of the top of the transfer barrel. The lower end of the exhaust port communicates with the inside of the transfer barrel, and the upper end extends upward and is welded and fixed to the top of the transfer barrel. The water inlet is disposed on the other side wall of the transfer barrel, located near the top of the transfer barrel. One end of the water inlet communicates with the inside of the transfer barrel, and the other end extends outward and is welded and fixed to the side wall of the transfer barrel.

[0008] Preferably, the water collector is located on the side above the base away from the transmission tank. The axis of the water collector is parallel to the upper surface of the base. The buried pipe interfaces are respectively located on the side walls of the water collector and the water distributor, distributed along the circumference of the water collector and the water distributor. The water collector cover is closed at the opening at the top of the water collector, and the lower surface of the water collector cover is attached to the upper surface of the water collector. It is connected to the top of the water collector by bolts. The water distributor is arranged side by side with the water collector above the base. The water distributor cover is closed at the opening at the top of the water distributor, and the lower surface of the water distributor cover is attached to the upper surface of the water distributor.

[0009] Preferably, the horizontal plate is connected between the top edges of the water collector cover and the water distributor cover, and the vertical plate is vertically connected to the lower surface of the middle part of the horizontal plate. The top of the vertical plate is welded and fixed to the lower surface of the horizontal plate, and the bottom is welded and fixed to the middle position of the upper surface of the base. Fixing screws are inserted at the connection positions of the two ends of the horizontal plate with the water collector cover and the water distributor cover. The monitoring box is connected to the base through the connecting arm. The monitoring box is a cuboid box.

[0010] Preferably, the monitoring panel is located at the upper part of the surface of the monitoring box, embedded in the surface of the monitoring box and flush with the surface of the monitoring box. The operation button is located on the surface of the monitoring box, below the monitoring panel. One end of the operation button is embedded inside the monitoring box, and the other end protrudes from the surface of the monitoring box. The connecting arm is an L-shaped metal rod, with one end connected to the base near the other edge and the other end connected to the bottom of the monitoring box. The two ends of the connecting arm are fixed to the base and the monitoring box by welding or bolts, respectively.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This type of soil-source heat pump buried pipe structure, during daily use, firstly, the fluid from the external buried pipe enters the water collector through the buried pipe interface on the side wall of the water collector. After being collected by the water collector, it is transported to the inlet interface of the transfer tank, and then flows into the transfer tank. While the fluid is in the transfer tank, the temperature is regulated by the heater fixed by the heater base, and at the same time, the vent in the middle of the top of the transfer tank discharges the gas entrained in the fluid. When the temperature-regulated fluid flows through the outlet interface on one side of the transfer tank, impurities are filtered by the filter on the inner side of the outlet interface, and then it flows out and enters the distributor through the buried pipe interface on the side wall of the distributor, and finally is distributed back to the external buried pipe by the distributor. Throughout the process, the monitoring box receives signals from the heater, the external variable frequency water pump and the main unit in real time through internal wires. The operator can view the operating data through the monitoring panel and adjust the equipment operation status through the operation buttons. The structure described in this working principle can realize orderly fluid transportation, temperature control, filtration and real-time monitoring, ensuring the stable and efficient operation of the soil-source heat pump buried pipe system. Attached Figure Description

[0012] Figure 1 This is a connection diagram of the various components of this utility model; Figure 2 This is a three-dimensional top view of the present invention; Figure 3 This is a three-dimensional side view of the present invention; Figure 4 This is a three-dimensional installation diagram of the present invention.

[0013] In the diagram: 1. Base; 2. Through hole; 3. Support block; 4. Filter; 5. Water outlet; 6. Heater base; 7. Heater; 8. Vent; 9. Transfer tank; 10. Water inlet; 11. Water collector; 12. Underground pipe interface; 13. Water collector cover; 14. Water distributor; 15. Water distributor cover; 16. Horizontal plate; 17. Vertical plate; 18. Fixing screw; 19. Monitoring box; 20. Monitoring panel; 21. Operation button; 22. Connecting arm. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0015] like Figure 1-4 As shown, this utility model provides a technical solution: a soil source heat pump buried pipe structure, including a base 1, through holes 2 evenly distributed along its length direction on the base 1, a support block 3 fixedly installed on the base 1 near one side, a transmission tank 9 connected to the top of the support block 3, a water outlet 5 provided on one side of the transmission tank 9 near the bottom, the base 1 is a plate structure, the through holes 2 are opened on the plate of the base 1, evenly distributed along the length direction of the base 1, penetrating the upper and lower surfaces of the base 1, the support block 3 is set on the upper surface of the base 1 near one side, the bottom of the support block 3 is connected to the upper surface of the base 1 by bolts, a filter 4 is installed on the inner side of the end of the water outlet 5, the outer ring of the filter 4 fits against the inner wall of the water outlet 5, the outer ring of the filter screen frame of the filter 4 is provided with external threads, which cooperate with the internal threads of the inner wall of the water outlet 5 to achieve fixation, the filter 4 is installed on the inner side of the end of the water outlet 5, a heater base 6 is provided in the middle of the inner wall of the transmission tank 9, and a heater 7 is connected to the heater base 6.

[0016] The coolant can be transferred to the filter 4 via the transfer tank 9. Example

[0017] like Figure 1-4As shown, this utility model provides a technical solution: a soil source heat pump buried pipe structure, including a base 1, with through holes 2 evenly distributed along its length direction on the base 1, a support block 3 fixedly installed on one side of the base 1, a transmission tank 9 connected to the top of the support block 3, and a water outlet 5 located near the bottom on one side of the transmission tank 9. The base 1 is a plate-shaped structure, with the through holes 2 evenly distributed along the length direction of the base 1, penetrating the upper and lower surfaces of the base 1. The support block 3 is located on one side of the upper surface of the base 1, and its bottom is bolted to the upper surface of the base 1. A filter 4 is installed inside the end of the water outlet 5, and the outer ring of the filter 4 is connected to the water outlet 5. The inner wall of the filter 4 is fitted together with the filter screen frame. The outer ring of the filter screen frame is provided with external threads, which are engaged with the internal threads of the inner wall of the water outlet 5 for fixation. The filter 4 is installed on the inner side of the end of the water outlet 5. The heater base 6 is located in the middle of the inner wall of the transfer tank 9. The heater 7 is connected to the heater base 6. The heater 7 is an armored structure. The exhaust port 8 is located in the middle of the top of the transfer tank 9. The water inlet 10 is located on one side of the transfer tank 9 near the top. The heater base 6 is located inside the transfer tank 9 and fits against the inner wall of the transfer tank 9. The heater 7 is snapped into the slot in the middle of the heater base 6. The outer wall of the heater 7 fits against the inner wall of the slot. The exhaust port 8 is located in the middle of the top of the transfer tank 9. The lower end of the air inlet 8 is connected to the interior of the transfer tank 9, and the upper end extends upward and is welded and fixed to the top of the transfer tank 9. The water inlet 10 is located on the other side wall of the transfer tank 9, near the top of the transfer tank 9. One end of the water inlet 10 is connected to the interior of the transfer tank 9, and the other end extends outward and is welded and fixed to the side wall of the transfer tank 9. A water collector 11 and a water distributor 14 are arranged side by side on the side of the base 1 away from the transfer tank 9. The side wall of the water collector 11 is provided with a buried pipe interface 12, which is connected to an external buried pipe. The opening at the top of the water collector 11 is covered with a water collector cover 13. The side wall of the water distributor 14 is provided with a buried pipe interface 12, which is connected to an external buried pipe. A water distributor cover 15 covers the opening at the top of the device 14. The water collector 11 is located on the side of the base 1 away from the transmission tank 9. The axis of the water collector 11 is parallel to the upper surface of the base 1. The underground pipe interface 12 is respectively located on the side wall of the water collector 11 and the water distributor 14, and is distributed along the circumference of the water collector 11 and the water distributor 14. The water collector cover 13 covers the opening at the top of the water collector 11. The lower surface of the water collector cover 13 is attached to the upper surface of the water collector 11 and is connected to the top of the water collector 11 by bolts. The water distributor 14 is arranged side by side with the water collector 11 above the base 1. The water distributor cover 15 covers the opening at the top of the water distributor 14. The lower surface of the water distributor cover 15 is attached to the upper surface of the water distributor 14.

[0018] The connection and layout of components such as base 1 and transfer bucket 9 facilitate stable installation and improve assembly efficiency. Example

[0019] like Figure 1-4As shown, this utility model provides a technical solution: a soil source heat pump buried pipe structure, including a base 1, with through holes 2 evenly distributed along its length direction on the base 1, a support block 3 fixedly installed on one side of the base 1, a transmission tank 9 connected to the top of the support block 3, and a water outlet 5 located near the bottom on one side of the transmission tank 9. The base 1 is a plate-shaped structure, with the through holes 2 evenly distributed along the length direction of the base 1, penetrating the upper and lower surfaces of the base 1. The support block 3 is located on one side of the upper surface of the base 1, and the bottom of the support block 3 is bolted to the upper surface of the base 1. A filter 4 is installed inside the end of the water outlet 5, with the outer ring of the filter 4 fitting against the inner wall of the water outlet 5. The filter screen frame of the filter 4 has an external thread on its outer ring. The internal thread of the outlet 5 is used for fixing. A filter 4 is installed on the inner side of the end of the outlet 5. A heater base 6 is located in the middle of the inner wall of the transfer tank 9. A heater 7 is connected to the heater base 6. The heater 7 has an armored structure. An exhaust port 8 is located in the middle of the top of the transfer tank 9. A water inlet 10 is located on one side of the transfer tank 9 near the top. The heater base 6 is located inside the transfer tank 9 and fits against the inner wall of the transfer tank 9. The heater 7 is snapped into the slot in the middle of the heater base 6. The outer wall of the heater 7 fits against the inner wall of the slot. The exhaust port 8 is located in the middle of the top of the transfer tank 9. The lower end of the exhaust port 8 communicates with the inside of the transfer tank 9, and the upper end extends upward and is welded to the top of the transfer tank 9. The water inlet 10 is provided with Located on the other side wall of the transfer tank 9, near the top of the transfer tank 9, one end of the water inlet 10 is connected to the inside of the transfer tank 9, and the other end extends outward and is welded and fixed to the side wall of the transfer tank 9. A water collector 11 and a water distributor 14 are arranged side-by-side on the side of the base 1 away from the transfer tank 9. The side wall of the water collector 11 has a buried pipe interface 12, which is connected to an external buried pipe. The opening at the top of the water collector 11 is covered by a water collector cover 13. The side wall of the water distributor 14 has a buried pipe interface 12, which is connected to an external buried pipe. The opening at the top of the water distributor 14 is covered by a water distributor cover 15. The water collector 11 is located on the side of the base 1 away from the transfer tank 9, and the axis of the water collector 11 is parallel to the upper surface of the base 1. Interfaces 12 are respectively provided on the side walls of the water collector 11 and the water distributor 14, distributed circumferentially along the water collector 11 and the water distributor 14. The water collector cover 13 covers the opening at the top of the water collector 11, and the lower surface of the water collector cover 13 is attached to the upper surface of the water collector 11. It is connected to the top of the water collector 11 by bolts. The water distributor 14 is arranged side by side with the water collector 11 above the base 1. The water distributor cover 15 covers the opening at the top of the water distributor 14, and the lower surface of the water distributor cover 15 is attached to the upper surface of the water distributor 14. A horizontal plate 16 is connected between the top edges of the water collector cover 13 and the water distributor cover 15. Fixing screws 18 are provided at the connection positions of the horizontal plate 16 to the water collector cover 13 and the water distributor cover 15. A vertical plate 17 is vertically connected to the lower surface of the middle part of the horizontal plate 16.The bottom of the upright plate 17 is welded to the middle of the upper surface of the base 1. A connecting arm 22 is connected to the base 1 near the other edge. The end of the connecting arm 22 away from the base 1 is connected to the monitoring box 19. The horizontal plate 16 is connected between the top edges of the water collector cover 13 and the water distributor cover 15. The upright plate 17 is vertically connected to the lower surface of the middle part of the horizontal plate 16. The top of the upright plate 17 is welded to the lower surface of the horizontal plate 16, and the bottom is welded to the middle of the upper surface of the base 1. Fixing screws 18 are inserted at the connection positions of the horizontal plate 16 to the water collector cover 13 and the water distributor cover 15 at both ends. The monitoring box 19 is connected to the base 1 through the connecting arm 22. The monitoring box 19 is a rectangular box. A monitoring panel 20 is located on the upper part of the surface of the monitoring box 19, and an operation button 21 is located below the monitoring panel 20. The interior of the monitoring box 19 is electrically connected to the wiring terminals of the heater 7, the control terminal of the external variable frequency water pump, and the signal terminal of the main unit via wires. The monitoring panel 20 is embedded in the surface of the monitoring box 19 and flush with it. The operation button 21 is located on the surface of the monitoring box 19, below the monitoring panel 20. One end of the operation button 21 is embedded inside the monitoring box 19, and the other end protrudes from the surface of the monitoring box 19. The connecting arm 22 is an L-shaped metal rod, with one end connected to the base 1 near the other edge, and the other end connected to the bottom of the monitoring box 19. Both ends of the connecting arm 22 are fixed to the base 1 and the monitoring box 19 by welding or bolts.

[0020] Through the precise layout of components such as filter 4 and heater 7, and the configuration of monitoring box 19, filtration, temperature control and monitoring are achieved, enhancing the operational efficiency of the buried pipe structure.

[0021] Working principle: Fluid from the external buried pipe enters the water collector 11 through the buried pipe interface 12 on the side wall of the water collector 11. After being collected by the water collector 11, it is transported to the water inlet 10 of the transfer tank 9 and then flows into the transfer tank 9. When the fluid is in the transfer tank 9, the temperature is regulated by the heater 7 fixed by the heater base 6. At the same time, the exhaust port 8 at the middle of the top of the transfer tank 9 discharges the gas entrained in the fluid. When the temperature-regulated fluid flows through the water outlet 5 on one side of the transfer tank 9, impurities are filtered by the filter 4 on the inner side of the end of the water outlet 5. Then it flows out and enters the water distributor 14 through the buried pipe interface 12 on the side wall of the distributor 14. Finally, it is distributed back to the external buried pipe through the water distributor 14. Throughout the process, the monitoring box 19 receives signals from the heater 7, the external variable frequency water pump and the main unit in real time through internal wires. The staff can view the operating data through the monitoring panel 20 and adjust the equipment operation status through the operation button 21.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil source heat pump buried pipe structure, comprising a base (1), characterized in that: The base (1) has through holes (2) evenly distributed along its length. A support block (3) is fixedly installed on one side of the base (1). A transmission tank (9) is connected to the top of the support block (3). A water outlet (5) is provided on one side of the transmission tank (9) near the bottom. A filter (4) is installed on the inner side of the end of the water outlet (5). A heater base (6) is provided in the middle of the inner wall of the transmission tank (9). A heater (7) is connected to the heater base (6). The heater (7) is... The structure is armored. An exhaust port (8) is located in the middle of the top of the transmission tank (9). A water inlet (10) is located on one side of the transmission tank (9) near the top. A water collector (11) and a water distributor (14) are arranged side-by-side on the side of the base (1) away from the transmission tank (9). A buried pipe interface (12) is located on the side wall of the water collector (11), which is connected to an external buried pipe. A water collector cover (13) is fitted over the opening at the top of the water collector (11). The water distributor (14)... The side wall is provided with a buried pipe interface (12), which is connected to an external buried pipe. The opening at the top of the water distributor (14) is covered with a water distributor cover (15). A horizontal plate (16) is connected between the top edge of the water collector cover (13) and the water distributor cover (15). Fixing screws (18) are provided at the connection positions of the two ends of the horizontal plate (16) with the water collector cover (13) and the water distributor cover (15). A vertical plate (17) is vertically connected to the lower surface of the middle part of the horizontal plate (16). The bottom of the vertical plate (17) The part is welded to the middle position of the upper surface of the base (1). A connecting arm (22) is connected to the base (1) near the other edge. A monitoring box (19) is connected to the end of the connecting arm (22) away from the base (1). A monitoring panel (20) is provided on the upper part of the surface of the monitoring box (19). An operation button (21) is provided below the monitoring panel (20). The inside of the monitoring box (19) is electrically connected to the wiring terminal of the heater (7), the control terminal of the external variable frequency water pump and the signal terminal of the host through wires.

2. The soil source heat pump buried pipe structure according to claim 1, characterized in that: The base (1) is a plate structure. Through holes (2) are opened on the plate of the base (1) and are evenly distributed along the length of the base (1), penetrating the upper and lower surfaces of the base (1). The support block (3) is set on the upper surface of the base (1) near one side. The bottom of the support block (3) is connected to the upper surface of the base (1) by bolts. The filter (4) is installed on the inner side of the end of the water outlet (5). The outer ring of the filter (4) fits against the inner wall of the water outlet (5). The outer ring of the filter screen frame of the filter (4) is provided with external threads, which cooperate with the internal threads of the inner wall of the water outlet (5) to achieve fixation.

3. The soil source heat pump buried pipe structure according to claim 1, characterized in that: The heater base (6) is located inside the transmission barrel (9) and fits against the inner wall of the transmission barrel (9). The heater (7) is snapped into the slot in the middle of the heater base (6). The outer wall of the heater (7) fits against the inner wall of the slot. The exhaust port (8) is located in the middle of the top of the transmission barrel (9). The lower end of the exhaust port (8) is connected to the inside of the transmission barrel (9), and the upper end extends upward and is welded and fixed to the top of the transmission barrel (9). The water inlet (10) is located on the other side wall of the transmission barrel (9) and is located near the top of the transmission barrel (9). One end of the water inlet (10) is connected to the inside of the transmission barrel (9), and the other end extends outward and is welded and fixed to the side wall of the transmission barrel (9).

4. The soil source heat pump buried pipe structure according to claim 1, characterized in that: The water collector (11) is located on the side above the base (1) away from the transmission tank (9). The axis of the water collector (11) is parallel to the upper surface of the base (1). The buried pipe interface (12) is located on the side wall of the water collector (11) and the water distributor (14) respectively, and is distributed along the circumference of the water collector (11) and the water distributor (14). The water collector cover (13) is closed on the opening at the top of the water collector (11). The lower surface of the water collector cover (13) is attached to the upper surface of the water collector (11) and is connected to the top of the water collector (11) by bolts. The water distributor (14) is arranged side by side with the water collector (11) above the base (1). The water distributor cover (15) is closed on the opening at the top of the water distributor (14). The lower surface of the water distributor cover (15) is attached to the upper surface of the water distributor (14).

5. The soil source heat pump buried pipe structure according to claim 1, characterized in that: The horizontal plate (16) is connected between the top edge of the water collector cover (13) and the water distributor cover (15). The vertical plate (17) is vertically connected to the lower surface of the middle part of the horizontal plate (16). The top of the vertical plate (17) is welded and fixed to the lower surface of the horizontal plate (16), and the bottom is welded and fixed to the middle position of the upper surface of the base (1). The fixing screws (18) are inserted at the connection positions of the two ends of the horizontal plate (16) with the water collector cover (13) and the water distributor cover (15). The monitoring box (19) is connected to the base (1) through the connecting arm (22). The monitoring box (19) is a cuboid box.

6. The soil source heat pump buried pipe structure according to claim 1, characterized in that: The monitoring panel (20) is located on the upper part of the surface of the monitoring box (19). The monitoring panel (20) is embedded in the surface of the monitoring box (19) and is flush with the surface of the monitoring box (19). The operation button (21) is located on the surface of the monitoring box (19) and below the monitoring panel (20). One end of the operation button (21) is embedded inside the monitoring box (19) and the other end protrudes from the surface of the monitoring box (19). The connecting arm (22) is an L-shaped metal rod. One end is connected to the position on the base (1) near the other edge, and the other end is connected to the bottom of the monitoring box (19). The two ends of the connecting arm (22) are fixed to the base (1) and the monitoring box (19) by welding or bolts, respectively.

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