Water distribution ring pipe pouring temperature adjusting device

Abstract

The utility model discloses a pouring temperature adjusting device for a water distribution ring pipe. The pouring temperature adjusting device is composed of a heat preservation pipe, a heat dissipation plate and a supporting device. The heat preservation pipe is a hollow heat transfer pipe matched with the water distribution ring pipe in length, four sets of electric heating rods are coaxially arranged in the heat preservation pipe, one end of the heat preservation pipe is closed, and the other end of the heat preservation pipe is provided with a plug matched with the diameter of a pipe opening of the water distribution ring pipe in a sealed mode. The plug end is provided with a heating rod joint and a temperature sensor joint; the heat preservation pipe is fixed to the center of the water distribution ring pipe through supporting devices which are arranged at intervals in the axial direction and are of a cross structure. The temperature sensors are arranged on the cross support arms of the support device; a plurality of sets of heat dissipation plates are arranged at intervals in the axial direction of the heat preservation pipe, and each set comprises four heat dissipation plates which are fixed to the outer wall of the heat preservation pipe in a cross shape. The adjusting device disclosed by the utility model is uniform in heating, large in heating area and capable of avoiding bubbles; the heat dissipation plate and the cross-shaped support can ensure that the water outlet temperatures of different pipe diameters are consistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete pouring of water conservancy and hydropower construction projects, in particular to the technical field of concrete pouring of water distribution ring pipes of hydro-turbine generator sets, and specifically relates to a temperature regulating device for pouring heat-insulating and pressure-maintaining concrete for water distribution ring pipes of pelton-type hydro-turbine generator sets. Background Art

[0002] In cold and high altitude areas, the temperature difference between day and night is large. The casting of the huge 800MPa water distribution ring pipe is often subject to the influence of the temperature difference between day and night and the heat of concrete hydration, which causes the water distribution ring pipe to deform greatly during the casting process, and the deformation cannot be controlled. If insulation measures are not taken, a large gap will be generated between the water distribution ring pipe and the concrete casting layer, which will directly affect the operating conditions of the unit. The 800MPa water distribution ring pipe is cast with insulation and pressure. The internal medium of the water distribution ring pipe is common water. The volume of the water distribution ring pipe is about 400m 3 The required holding pressure is 5.2MPa. Therefore, the thermal insulation and pressure-maintaining casting of high-pressure and large-capacity water distribution ring pipes is a world problem. At the same time, the 500MPa-level water distribution ring pipe is limited by high-strength steel materials, and no welding form of rigid support can be made on the inner and outer walls of the water distribution ring pipe, which further increases the technical difficulty of casting. Summary of the invention

[0003] The utility model discloses a water distribution ring pipe pouring temperature regulating device based on the defects of the prior art. The utility model aims to provide a pouring temperature regulating device which can effectively solve the problem of accurate control of the high-pressure water temperature inside the water distribution ring pipe and ensure that the deformation of the water distribution ring pipe during concrete pouring is within a controllable range.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A water distribution ring pipe pouring temperature regulating device, characterized in that it is composed of a heat preservation pipe, a heat dissipation plate and a supporting device;

[0006] The insulation pipe is a hollow heat transfer pipe that matches the length of the water distribution ring pipe. Four groups of parallel electric heating rods are coaxially arranged in the insulation pipe. One end of the insulation pipe is closed and the other end is sealed with a plug that matches the diameter of the water distribution ring pipe. The insulation pipe is filled with heating medium. A hollow through-tube for arranging the temperature sensor cable is also arranged along the outer wall of the insulation pipe. The insulation pipe at the plug end extends out of the plug surface and is provided with a heating rod joint and a temperature sensor joint.

[0007] The supporting device fixes the insulation pipe at the center of the water distribution ring pipe; a plurality of heat dissipation plates are arranged at intervals along the axial direction of the insulation pipe, and each group of heat dissipation plates has four plates, which are fixed to the outer wall of the insulation pipe in a cross shape.

[0008] Furthermore, the supporting device is a cross structure, and multiple groups of the insulating pipes are arranged at intervals along the axial direction of the insulating pipes to fix the insulating pipes to the center of the water distribution ring pipe; the temperature sensors are arranged on each cross supporting arm of the supporting device.

[0009] Furthermore, the heat sink is a sealed sandwich cavity structure, and the cavity is in fluid communication with the heat preservation pipe heating medium.

[0010] Furthermore, the heat dissipation area of ​​each group of heat dissipation plates is proportional to the volume of the water distribution ring pipe.

[0011] Furthermore, each group of heating rods is arranged in sections, and each section of the heating rod is independently connected to a power source and a control switch via a cable.

[0012] Compared with the prior art, the utility model patent has the following beneficial effects: the utility model regulating device is provided with an insulation pipe inside the water distribution ring pipe, and a heating rod is provided in the insulation pipe. The heating rod is immersed in the heating medium, which can avoid direct contact between the heating rod and water, increase the heating area, and avoid adverse phenomena such as bubbles; different sizes and numbers of heat sinks are provided according to the different cross-sectional diameters of the water distribution ring pipe or the volume of the water distribution ring pipe to ensure that the outlet water temperature of different pipe diameters is basically the same. The insulation pipe is arranged in the center of the water distribution ring pipe through multiple groups of crosses, and the heating is more uniform through the heat sink, and the temperature control is more stable; the independently arranged heating rods can achieve more accurate temperature control in different areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the assembly diagram of the water temperature regulating device of the utility model;

[0014] Figure 2 This is a schematic diagram of a plug of a water temperature regulating device of the utility model;

[0015] Figure 3 This is a schematic diagram of the interior of the insulation pipe of the water temperature regulating device of the utility model;

[0016] Figure 4 It is a schematic diagram of the overall structure of the water distribution ring pipe.

[0017] Reference numerals in the figure: 1-plug, 1.1-heating rod joint, 1.2-temperature sensor joint; 2-heating plate; 3-support device; 4-insulation pipe, 4.1-heating medium, 4.2-heating rod, 4.3-sensor cable conduit; 5-water distribution ring pipe, 5.1-water distribution ring pipe plug, 5.2-deformation monitoring device. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies identical or similar to the present invention do not exceed the scope of protection of the present invention.

[0019] Combined with the attached pictures.

[0020] As shown in the figure, the water distribution ring pipe pouring temperature regulating device of the present invention is composed of a heat preservation pipe 4, a heat dissipation plate 2 and a supporting device 3.

[0021] One end of the insulation pipe 4 is fixed to the water distribution ring pipe 5 through a water distribution ring pipe plug 5.1. A hole is opened through the water distribution ring pipe plug 5.1 for passing through the insulation pipe 4 and its provided heating rod connector 1.1 and temperature sensor connector 1.2. The heating rod connector 1.1 is used to connect to a power source, and the temperature sensor connector 1.2 is used to connect to a sensor signal receiving device.

[0022] A high-power electric heating rod 4.2 is arranged inside the insulation pipe 4, and a heat sink 2 is arranged on the outer wall; a temperature sensor cable is also arranged along the axial direction of the outer wall. The insulation pipe 4 is filled with a heating medium 4.1, which is usually heating oil with a boiling point of not less than 200°C; the heating rods 4.2 can be connected by high-power heating rods, and each group of heating rods 4.2 is arranged in sections, and each section of the heating rods 4.2 is independently connected to the power supply and control switch through a cable. The heat sink 2 is provided with cavity plates of different sizes according to the water volume ratio of the water distribution ring pipe 5, and the cavity is directly connected to the insulation pipe 4 and contains the heating medium 4.1.

[0023] like Figure 1 As shown, the water temperature regulating device for heat preservation and pressure preservation pouring of water distribution ring pipe in this embodiment comprises a water distribution ring pipe plug 1, a heat sink 2, a support device 3, and a heat preservation pipe 4. The water distribution ring pipe plug 1 is provided with a heating rod joint 1.1 and a temperature measuring line joint 1.2; the heat sink 2 is provided in multiple groups on the outer wall of the heat preservation pipe 4 and is connected with the heat preservation pipe 4; the support device 3 is a cross structure, and the outer end of the cross is supported on the inner wall of the water distribution ring pipe 5 to fix the heat preservation pipe 4 to the center of the water distribution ring pipe 5.

[0024] The heating rod joint 1.1 is connected to the insulation pipe 4 by welding, and the insulation pipe 4 passes through and is welded to the center of the water distribution ring pipe plug 1.

[0025] The heat sink 2 is fixed on the outer wall of the insulation pipe 4 by welding in a cross-shaped arrangement, with four pieces evenly arranged in the circumferential direction, and the heating medium 4.1 is passed through the inside. The heat dissipation area of ​​the heat sink 2 is proportional to the volume of the water distribution ring pipe 5; according to the size and volume of the corresponding water distribution ring pipe, the maximum heat sink 2 area is set at the maximum size, and the remaining heat sink 2 areas are proportional to the internal volume of the water distribution ring pipe 5. Assuming that the maximum volume of the water distribution ring pipe 5 is V1, the corresponding heat sink 2 area is S1, and the next section volume of the water distribution ring pipe 5 is V2, then the area of ​​the heat sink 2 set in the next group is S2 = S1 × V2 / V1, and the area of ​​other groups of heat sinks can be calculated in this way. In this embodiment, the heat sink is set in 6 groups according to the size and volume of the water distribution ring pipe 5. The heat dissipation area of ​​each group of heat sinks 2 consists of four pieces evenly distributed along the circumferential direction, and the inside is connected.

[0026] The insulation pipe 4 is a stainless steel pipe with an inner diameter of 300 mm and a maximum bearing pressure of 13 MPa. It is welded in sections to form a whole and is filled with a high-temperature resistant heating medium 4.1. The heating medium 4.1 is required to be able to withstand a high temperature of 200°C. Four heating rods 4.2 are set in two groups, which are mutually primary and standby. Simple separation supports are provided between each heating rod 4.2. The four heating rods 4.2 are composed of multiple small heating rods connected in series to form a whole. A sensor cable conduit 4.3 is set on the outer wall of the insulation pipe 4 for passing the temperature measuring line of the central temperature measuring sensor; the water distribution ring pipe plug 1 is installed at the pipe mouth of the water distribution ring pipe 5.

[0027] During pouring, the power is turned on through the heating rod joint 1.1, and the heating rod 4.2 begins to evenly heat the heating medium 4.1 in the insulation pipe 4. The water temperature inside the water distribution ring pipe is heated through the insulation pipe 4 and the heat sink 2. The changes in water temperature at different sections are monitored to achieve water temperature control.

Claims

1. A water distribution ring pipe pouring temperature regulating device, characterized in that: It is composed of a heat preservation pipe, a heat dissipation plate and a supporting device; The insulation pipe is a hollow heat transfer pipe that matches the length of the water distribution ring pipe. Four groups of parallel electric heating rods are coaxially arranged in the insulation pipe. One end of the insulation pipe is closed and the other end is sealed with a plug that matches the diameter of the water distribution ring pipe. The insulation pipe is filled with heating medium. A hollow through-tube for arranging the temperature sensor cable is also arranged along the outer wall of the insulation pipe. The insulation pipe at the plug end extends out of the plug surface and is provided with a heating rod joint and a temperature sensor joint. The supporting device fixes the insulation pipe at the center of the water distribution ring pipe; a plurality of heat dissipation plates are arranged at intervals along the axial direction of the insulation pipe, and each group of heat dissipation plates has four plates, which are fixed to the outer wall of the insulation pipe in a cross shape.

2. The water distribution ring pipe pouring temperature regulating device according to claim 1 is characterized in that: The support device is a cross structure, and multiple groups are arranged at intervals along the axial direction of the insulation pipe to fix the insulation pipe to the center of the water distribution ring pipe; the temperature sensor is arranged on each cross support arm of the support device.

3. The water distribution ring pipe pouring temperature regulating device according to claim 1 is characterized in that: The heat sink is a sealed sandwich cavity structure, and the cavity is in fluid communication with the heating medium of the insulation pipe.

4. The water distribution ring pipe pouring temperature regulating device according to claim 1 is characterized in that: The heat dissipation area of ​​each group of heat dissipation plates is proportional to the volume of the water distribution ring pipe.

5. The water distribution ring pipe pouring temperature regulating device according to claim 1, 2, 3 or 4, characterized in that: Each group of heating rods is arranged in sections, and each section of the heating rod is independently connected to the power supply and the control switch through a cable.

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