Heat and pressure preservation device for pouring of volute of hydropower station

Abstract

The utility model discloses a heat preservation and pressure maintaining device for casting a volute of a hydropower station, which belongs to the technical field of volute casting and comprises a heat preservation and pressure maintaining type volute assembly, the heat preservation and pressure maintaining type volute assembly comprises a volute body, a pressure sensor arranged outside the volute body and a temperature sensor arranged inside the volute body; the heat-preservation conduction assembly comprises two cold and hot water heat-preservation liquid pipe fittings which are integrally formed on the inner wall of the volute body and are symmetrically distributed, and a plurality of heat-preservation conduction arc-shaped plates which are symmetrically connected to the outer walls of the two cold and hot water heat-preservation liquid pipe fittings; the auxiliary heat-preservation fastening assembly comprises a plurality of heat-preservation rubber fastening belts which are distributed at equal intervals and wrap and adhere to the outer wall of the volute body. The two cold and hot water heat preservation liquid pipe fittings are arranged along the inner wall of the volute body in a bent mode. When heat preservation is conducted in the volute body, cold water or hot water is input into the cold and hot water heat preservation liquid pipe fitting according to needs, and cold and heat of the cold and hot water heat preservation liquid pipe fitting is conducted to the volute body and water in the volute body through the heat preservation conduction arc-shaped plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of volute casting, in particular to a heat preservation and pressure maintaining device for volute casting of a hydropower station. Background Art

[0002] In the construction of hydropower stations, the volute, as a key component of the turbine, plays an important role in guiding water flow and converting kinetic energy of water into rotational mechanical energy. The stability and durability of its structure are directly related to the operating efficiency and safety of the hydropower station. However, in the casting process of the volute, especially in the construction of large hydropower stations, how to effectively control the uniformity of temperature and pressure in the casting environment has become a crucial challenge.

[0003] At present, the traditional methods of volute casting technology are often not perfect in terms of insulation and pressure maintenance, lack of effective heat energy transmission, which can easily lead to uneven heat and cold inside the volute, easily causing cracking of the concrete and damage to the volute. Utility Model Content

[0004] The utility model aims to provide a heat preservation and pressure maintaining device for pouring a volute of a hydropower station, so as to solve the problems raised in the background technology.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a heat preservation and pressure maintaining device for casting a volute of a hydropower station, comprising:

[0006] The heat-insulating and pressure-insulating volute assembly comprises a volute body, a pressure sensor installed outside the volute body, and a temperature sensor installed inside the volute body;

[0007] The heat preservation and conduction component comprises two cold and hot water heat preservation liquid pipes integrally formed on the inner wall of the volute body and symmetrically distributed, and a plurality of heat preservation and conduction arc plates symmetrically connected to the outer walls of the two cold and hot water heat preservation liquid pipes and equidistantly distributed;

[0008] An auxiliary heat-insulating fastening assembly, comprising a plurality of heat-insulating rubber fastening belts which are equidistantly distributed and wrapped and bonded to the outer wall of the volute body;

[0009] Among them, the two cold and hot water insulation liquid pipes are bent along the inner wall of the volute body, and the two cold and hot water insulation liquid pipes are provided with insulation liquid pipe end faces on the opposite sides, and the insulation liquid pipe end faces are arranged on the outer wall of the volute body, and the outer wall of each of the insulation conduction arc plates is attached to the inner wall of the volute body. When the inside of the volute body is insulated, cold water or hot water is input into the cold and hot water insulation liquid pipes as required, and the cold and heat of the cold and hot water insulation liquid pipes are conducted to the volute body and the water inside the volute body through the insulation conduction arc plate.

[0010] Preferably, the centers of two adjacent heat-insulating conductive arc plates are opposite to each other and are spliced ​​on the outer walls of two cold and hot water insulation liquid pipes.

[0011] Preferably, the cold and hot water insulation liquid pipe fittings and the insulation conduction curved plate are made of copper, and a corrosion-resistant layer is provided on the outer walls of the cold and hot water insulation liquid pipe fittings and the insulation conduction curved plate.

[0012] Preferably, the plurality of thermal insulation rubber fastening belts compress and wrap each end face of the thermal insulation liquid pipe, the thermal insulation rubber fastening belts are placed between the volute body and the external concrete, and the free end of the volute body is integrally connected with a connecting flange.

[0013] Preferably, the outer wall of the end face of each of the insulation liquid pipes and one end close to the connecting flange is provided with a water inlet countersunk hole, and a water inlet safety sealing nut is threadedly connected in the water inlet countersunk hole;

[0014] The outer wall of the end face of each of the thermal insulation liquid pipes and one end away from the connecting flange is threadedly connected with a drain outlet safety sealing nut.

[0015] In this solution, preferably, the two ends of the two heat-insulating conductive arc plates arranged with opposite centers have connection fracture portions for accommodating hot and cold water heat-insulating liquid pipes, and the two adjacent heat-insulating conductive arc plates distributed along the curved extension track of the volute body are symmetrically connected with heat-insulating conductive auxiliary strips, so that the heat-insulating conductive auxiliary strips can further conduct heat or cold to the inner cavity of the volute body, thereby making the heat preservation inside the volute body more sufficient and uniform.

[0016] Preferably, in this solution, a plurality of stress holes are evenly distributed on the surface of each of the heat-insulating conduction auxiliary strips.

[0017] Compared with the prior art, the technical effects and advantages of the utility model are as follows:

[0018] The heat preservation and pressure-maintaining device for pouring the volute of the hydropower station realizes rapid and uniform temperature regulation inside the volute through the combination of heat preservation and conduction components, especially the cold and hot water heat preservation liquid pipe fittings and the heat preservation and conduction arc plate. The cold and hot water circulate in the heat preservation liquid pipe fittings, and the heat is quickly transferred to the volute body and the internal water body through the arc plate, reducing the delay and unevenness of heat transfer. This design ensures that the poured concrete solidifies within the optimal temperature range, improves the early strength and long-term durability of the concrete, reduces cracks caused by temperature gradients, and thus improves the structural integrity of the volute.

[0019] The opening of stress holes on the insulation conduction auxiliary strips and the use of auxiliary insulation fastening components, especially the wrapping and fastening of the insulation rubber fastening belts, effectively alleviate the stress concentration caused by internal pressure and thermal expansion that the volute may encounter during casting and operation. This design significantly reduces the risk of structural damage caused by stress concentration, extends the service life of the volute, and improves the safety and reliability of the entire hydropower station system.

[0020] The integration of pressure sensors and temperature sensors enables real-time monitoring of the internal environment of the volute, and can instantly feed back data to the control system, automatically adjusting the flow and temperature of the insulation liquid according to actual working conditions. Automated temperature and pressure monitoring not only improves construction efficiency, but also ensures the accuracy of operations, reduces errors caused by manual intervention, and reduces energy consumption, thereby improving the economy and environmental performance of the overall project. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the water inlet safety plugging nut and the drain outlet safety plugging nut of the utility model;

[0024] Figure 3 It is a left side view of the cold and hot insulation liquid pipe fitting of the utility model;

[0025] Figure 4 It is a cross-sectional view of the connection port of the volute body of the utility model;

[0026] Figure 5 This is a schematic diagram of the disassembled state of the water inlet safety plugging nut of the utility model;

[0027] Figure 6 It is a schematic structural diagram of the connection state of the heat-insulating conduction arc plate and the heat-insulating conduction auxiliary strip of the utility model.

[0028] Description of reference numerals:

[0029] In the figure: 1. Insulation and pressure-keeping volute assembly; 2. Insulation conduction component; 3. Auxiliary insulation fastening component; 4. Volute body; 5. Impeller component; 6. End face of insulation liquid pipe; 7. Cold and hot water insulation liquid pipe fittings; 8. Insulation conduction arc plate; 9. Connecting flange; 10. Insulation rubber fastening belt; 11. Water inlet safety sealing nut; 12. Drain safety sealing nut; 13. Water inlet countersunk hole; 14. Connecting fracture part; 15. Insulation conduction auxiliary strip; 16. Stress hole; 17. Pressure sensor; 18. Temperature sensor. DETAILED DESCRIPTION

[0030] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0031] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside in the figures shown in the present utility model, and are explained here together.

[0032] This embodiment provides Figures 1 to 6 The heat preservation and pressure-maintaining device for casting a volute of a hydropower station shown comprises a heat preservation and pressure-maintaining volute assembly 1, a heat preservation and conduction component 2, and an auxiliary heat preservation and fastening component 3;

[0033] in;

[0034] The heat-insulating and pressure-retaining volute assembly 1 includes a volute body 4, a pressure sensor 17 installed on the outside of the volute body 4, and a temperature sensor 18 installed inside the volute body 4. The temperature sensor 18 is embedded in the pipe where the circulating water flows inside the volute body 4, so that the water temperature can be directly measured to ensure that the water temperature is controlled within the target range. The monitoring end of the pressure sensor 17 penetrates into the volute body 4 to directly measure the actual working pressure. The pressure sensor 17 monitors the internal pressure of the volute body 4, and timely feedbacks information to ensure safe operation and prevent overpressure risks. The temperature sensor 18 monitors the internal temperature of the volute body 4 in real time.

[0035] In this embodiment, the heat preservation and conduction component 2 includes two cold and hot water heat preservation liquid pipes 7 integrally formed on the inner wall of the volute body 4 and symmetrically distributed, and a plurality of heat preservation and conduction arc plates 8 symmetrically connected to the outer walls of the two cold and hot water heat preservation liquid pipes 7 and equidistantly distributed. The two cold and hot water heat preservation liquid pipes 7 are bent along the inner wall of the volute body 4, and the two cold and hot water heat preservation liquid pipes 7 are provided with heat preservation liquid pipe end faces 6 on the opposite sides, and the heat preservation liquid pipe end faces 6 are provided on the outer wall of the volute body 4. The outer wall of each heat preservation and conduction arc plate 8 is attached to the inner wall of the volute body 4. When the inside of the volute body 4 is heat-insulated, cold water or hot water is input into the cold and hot water heat preservation liquid pipes 7 as required, and the cold and heat of the cold and hot water heat preservation liquid pipes 7 are conducted to the volute body 4 and the water inside the volute body 4 through the heat preservation and conduction arc plates 8. An impeller 5 is provided in the middle of the volute body 4.

[0036] In this embodiment, the heat-insulating conduction component 2 is composed of a cold and hot water heat-insulating liquid pipe 7 and a heat-insulating conduction arc plate 8, and its main function is to adjust the temperature inside the volute body 4 by circulating cold and hot water to maintain a constant temperature environment required for the pouring process. This helps to improve the solidification quality and efficiency of the pouring material and avoid problems such as stress cracking caused by temperature changes. The heat-insulating conduction arc plate 8 fits the inner wall of the volute body 4 and effectively conducts heat through heat exchange with the cold and hot water heat-insulating liquid pipe 7, thereby improving the heat exchange efficiency and ensuring uniform temperature distribution.

[0037] In this embodiment, the centers of two adjacent thermal insulation conduction arc plates 8 are opposite and spliced ​​on the outer walls of two cold and hot water insulation liquid pipe fittings 7. The cold and hot water insulation liquid pipe fittings 7 and the thermal insulation conduction arc plates 8 are made of copper, and a corrosion-resistant layer is provided on the outer walls of the cold and hot water insulation liquid pipe fittings 7 and the thermal insulation conduction arc plates 8. The corrosion-resistant layer includes but is not limited to tin plating, passivation treatment, and nano-coating, which is selected according to the actual application scenario.

[0038] In this embodiment, the auxiliary insulation fastening assembly 3 includes a plurality of insulation rubber fastening belts 10 which are equidistantly distributed and wrapped and bonded to the outer wall of the volute body 4. The plurality of insulation rubber fastening belts 10 compress and wrap each insulation liquid pipe end face 6. The insulation rubber fastening belts 10 are placed between the volute body 4 and the external concrete. The free end of the volute body 4 is integrally connected with a connecting flange 9. The connecting flange 9 is used to connect the volute body 4 with other equipment or pipelines to ensure sealing and stability and facilitate installation and maintenance. An inlet countersunk hole 13 is provided on the outer wall of each insulation liquid pipe end face 6 and at one end close to the connecting flange 9. A water inlet safety sealing nut 11 is threadedly connected in the water inlet countersunk hole 13. A drain outlet safety sealing nut 12 is threadedly connected to the outer wall of each insulation liquid pipe end face 6 and at one end away from the connecting flange 9.

[0039] In this embodiment, the function of the thermal insulation rubber fastening belt 10 is to strengthen the sealing and fastening between the thermal insulation layer and the volute body 4, prevent heat loss, increase the stability of the structure, and ensure the durability and uniformity of the thermal insulation effect. The end face 6 of the thermal insulation liquid pipe serves as the interface between the hot and cold water thermal insulation liquid pipe fittings 7 and the outside world. The inlet countersunk hole 13 and the drain safety plugging nut 12 control the inlet and outlet of the liquid to achieve the temperature regulation function. The inlet safety plugging nut 11 and the drain safety plugging nut 12 can ensure the sealing of the hot and cold water system, which is convenient for system maintenance and safe operation.

[0040] In this embodiment, there are connection fracture portions 14 for accommodating the hot and cold water insulation liquid pipe fittings 7 between the two ends of the two heat-insulating conduction arc plates 8 arranged with the center of the circle facing each other, and heat-insulating conduction auxiliary strips 15 are symmetrically connected between the two adjacent heat-insulating conduction arc plates 8 distributed along the curved extension track of the volute body 4. The heat-insulating conduction auxiliary strips 15 can further conduct heat or cold to the inner cavity of the volute body 4, so that the heat preservation inside the volute body 4 is more sufficient and uniform, and a plurality of stress holes 16 are evenly distributed on the surface of each heat-insulating conduction auxiliary strip 15.

[0041] In this embodiment, the thermal insulation conduction auxiliary strip 15 enhances the thermal insulation conduction effect, especially in the area between the thermal insulation conduction arc plates 8, to ensure more uniform heat transfer and improve the thermal insulation efficiency. Stress holes 16 are equidistantly opened on the surface of the thermal insulation conduction auxiliary strip 15 to release structural stress, improve the stability and life of the overall structure, and prevent cracks or damage caused by stress concentration.

[0042] In this embodiment, the pressure sensor 17 and the temperature sensor 18 data are continuously monitored during the pouring process, and the liquid temperature and pressure in the insulation liquid pipe are adjusted according to the feedback to ensure the pouring quality. When the pressure in the volute body 4 is too large or too small, the main function of the pressure sensor 17 is to monitor this pressure change and transmit these data to the PLC of the monitoring platform in real time through wired or wireless methods (selected according to the actual use occasion, such as GPRS, 433MHz, 2.4GHz, ZigBee, LoRa, NB-IoT and other communication technologies). The model of the PLC should be selected according to the actual use occasion. The appropriate model, similarly, when the temperature sensor 18 detects that the internal temperature of the volute body 4 is not suitable (too high or too low), it will also feedback the temperature information to the PLC. After the PLC receives the sensor data, the central processor is responsible for processing these data, comparing the actual measurement value with the set target value, and judging whether it is necessary to take adjustment measures. For example, if it is detected that the pressure or temperature exceeds the preset range, the PLC will send a command to the alarm to alarm and remind the staff to check and intervene.

[0043] In this embodiment, when pouring concrete in winter, firstly, pre-heated hot water is input into the volute body 4 through the hot and cold water insulation liquid pipe 7 in the heat-insulating and pressure-keeping volute assembly 1. This step is intended to increase the initial temperature inside the volute and the pouring area to prevent poor solidification or reduced strength of the concrete due to low temperature. The temperature sensor 18 is used to monitor the temperature of the water body inside the volute to ensure that it gradually rises to the temperature range specified in the design. At this time, the heat-insulating conduction component 2 and the auxiliary heat-insulating fastening component 3 work together to promote uniform heat distribution and maintain temperature stability through the heat-insulating conduction arc plate 8 and the heat-insulating rubber fastening belt 10. When the temperature reaches the predetermined value, the outer concrete is poured. At the same time, the heat-insulating and pressure-keeping device maintains the temperature and pressure inside the volute body 4 to ensure that the newly poured concrete hardens in an ideal warm and humid environment and prevents early freezing damage caused by low external temperatures.

[0044] In this embodiment, when pouring concrete in summer, the hot and cold water insulation liquid pipe 7 is replaced by cold water to reduce the initial temperature of the water body inside the volute. This helps to offset the adverse effects of high temperature outside on the concrete solidification process, such as reducing the evaporation rate of water and controlling the internal temperature of the concrete, and preventing cracking caused by too fast hydration heat release. Similarly, the temperature sensor 18 continuously monitors the internal temperature and adjusts the cold water flow to ensure that the temperature drops to within the design requirements. This process also relies on the insulation conduction component 2 and the auxiliary insulation fastening component 3 to maintain uniform and stable temperature. After reaching a suitable low temperature environment, concrete pouring begins. At this time, in addition to maintaining the necessary temperature, the insulation and pressure device also needs to properly control the pressure to ensure high-quality concrete pouring in high temperature seasons and prevent the concrete structure strength from decreasing due to excessively high temperatures.

[0045] Working principle:

[0046] The heat preservation and pressure-maintaining device for casting the volute of the hydropower station has a pressure sensor 17 installed outside the volute body 4 to monitor the pressure state inside the volute in real time to ensure that no overpressure occurs during the casting process; the internal temperature sensor 18 monitors the temperature to ensure that the casting material solidifies within a suitable temperature range to avoid cracks or strength reduction caused by excessive temperature difference. Cold water or hot water circulates inside the cold and hot water insulation liquid pipe 7 to adjust the internal temperature of the volute body 4 as needed. The heat preservation and conduction arc plate 8 is close to the inner wall of the volute body 4, and the cold and hot water insulation liquid pipe 7 is transferred to the volute body 4 through the heat conduction mechanism, thereby affecting the internal environment of the volute body 4, maintaining a uniform temperature, and preventing local overheating or overcooling. The stress holes 16 opened on the heat preservation and conduction auxiliary strips 15 can effectively disperse the stress generated by the volute body 4 under the internal and external pressure difference or temperature change, avoid structural damage caused by stress concentration, and improve the stability and durability of the device.

[0047] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat preservation and pressure maintaining device for casting a volute of a hydropower station, characterized in that: include: A heat-insulating and pressure-insulating volute assembly (1) comprises a volute body (4), a pressure sensor (17) installed outside the volute body (4), and a temperature sensor (18) installed inside the volute body (4); The heat-insulating conduction component (2) comprises two cold and hot water heat-insulating liquid pipes (7) integrally formed on the inner wall of the volute body (4) and symmetrically distributed, and a plurality of heat-insulating conduction arc plates (8) symmetrically connected to the outer walls of the two cold and hot water heat-insulating liquid pipes (7) and equidistantly distributed; An auxiliary heat-insulating fastening assembly (3) comprising a plurality of heat-insulating rubber fastening belts (10) which are equidistantly distributed and wrapped and bonded to the outer wall of the volute body (4); The two cold and hot water insulation liquid pipes (7) are bent along the inner wall of the volute body (4), and the two cold and hot water insulation liquid pipes (7) are provided with insulation liquid pipe end faces (6) on opposite sides thereof, and the insulation liquid pipe end faces (6) are arranged on the outer wall of the volute body (4), and the outer wall of each of the insulation conduction arc plates (8) is in contact with the inner wall of the volute body (4). When the interior of the volute body (4) is insulated, cold water or hot water is input into the cold and hot water insulation liquid pipes (7) as required, and the cold and hot water of the cold and hot water insulation liquid pipes (7) are conducted to the volute body (4) and the water inside the volute body (4) through the insulation conduction arc plates (8).

2. A heat preservation and pressure maintaining device for casting a volute of a hydropower station according to claim 1, characterized in that: The centers of two adjacent heat-insulating conductive arc plates (8) are opposite to each other and are spliced ​​on the outer walls of two cold and hot water heat-insulating liquid pipes (7).

3. A heat preservation and pressure maintaining device for casting a hydropower station volute according to claim 2, characterized in that: The cold and hot water insulation liquid pipe fittings (7) and the insulation conduction curved plate (8) are made of copper, and a corrosion-resistant layer is provided on the outer walls of the cold and hot water insulation liquid pipe fittings (7) and the insulation conduction curved plate (8).

4. A heat preservation and pressure maintaining device for casting a hydropower station volute according to claim 3, characterized in that: A plurality of the thermal insulation rubber fastening bands (10) compress and wrap each thermal insulation liquid pipe end face (6); the thermal insulation rubber fastening bands (10) are placed between the volute body (4) and the external concrete; the free end of the volute body (4) is integrally connected with a connecting flange (9).

5. A heat preservation and pressure maintaining device for casting a volute of a hydropower station according to claim 4, characterized in that: A water inlet countersunk hole (13) is provided on the outer wall of the end face (6) of each of the heat-insulating liquid pipes and at one end close to the connecting flange (9), and a water inlet safety plugging nut (11) is threadedly connected to the water inlet countersunk hole (13); The outer wall of each end face (6) of the heat-insulating liquid pipe and one end away from the connecting flange (9) is threadedly connected with a drain outlet safety sealing nut (12).

6. A heat preservation and pressure maintaining device for casting a volute of a hydropower station according to claim 5, characterized in that: There are connecting openings (14) for accommodating the cold and hot water insulation liquid pipes (7) between the two ends of the two heat-insulating conductive arc plates (8) arranged with their centers facing each other; A thermal insulation conduction auxiliary strip (15) is symmetrically connected between two adjacent thermal insulation conduction arc plates (8) distributed along the curved extension track of the volute body (4).

7. A heat preservation and pressure maintaining device for casting a volute of a hydropower station according to claim 6, characterized in that: The surface of each heat-insulating conduction auxiliary strip (15) is provided with a plurality of stress holes (16) distributed evenly.

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