CN207149360U - A kind of underwater transformer of Natural Heat Convection formula - Google Patents

Abstract

The utility model belongs to underwater electrical equipment field, and specifically disclose a kind of underwater transformer of Natural Heat Convection formula, it includes housing, transformer body and heat loss through convection component, housing is the cavity structure of upper end closed lower ending opening, its lower end is connected with base, base is internally formed a confined space for being full of transformer oil with housing hollow structure, and hull outside face is connected with compensator；Transformer body includes core assembly, input and output end, and in confined space and on base, input and output end are arranged on housing core assembly；Heat loss through convection component includes some heat loss through convection pipes that circumferentially arrangement is looped around hull outside, and every heat loss through convection pipe is arranged vertically, and both ends are connected with housing to be turned on confined space.The utility model can effectively solve the problems, such as that existing radiating mode radiating efficiency is low, have the advantages of heat exchange time is long, heat output is big, radiating efficiency is high, suitable for underwater hydrocarbon production system.

Description

A Natural Convection Heat Dissipation Submersible Transformer

technical field

The utility model belongs to the field of underwater electrical equipment, and more specifically relates to a natural convection heat dissipation underwater transformer.

Background technique

The basic structure of the underwater transformer is to install the transformer in a sealed casing, and the space between the transformer and the casing is filled with insulating oil. The underwater transformer works on the deep seabed and bears the pressure of seawater, and the loss of the transformer radiates outward in the form of heat, so the underwater transformer also bears the heat. While the transformer is going through different working states, the insulating oil will also expand and contract with temperature. If seawater infiltrates the insulating oil in the underwater transformer shell, the transformer will fail. Therefore, except for special circumstances, the normal and reliable operation of underwater transformers under the action of pressure and heat should be guaranteed.

In order to ensure the sealing and reliability of the underwater transformer, it is necessary to ensure that the internal pressure of the underwater transformer shell is higher than its external pressure, and the pressure difference is required to be about 0.02-0.05MPa. The pressure compensator is one of the main devices to ensure the required pressure difference between the inside and outside of the underwater transformer and ensure the normal operation of the underwater transformer. To put it simply, the pressure compensator is an elastic element that compensates for pressure changes caused by temperature changes and volume changes on underwater transformers. Among them, the pressure compensation is to control the oil filling amount in the underwater transformer shell, and the pressure compensator produces corresponding deformation displacement, so that the oil pressure in the shell is consistent with the external pressure of the shell and the elastic force of the pressure compensator (both directions are consistent. ) balance, so that the internal pressure of the underwater transformer box is slightly higher than the external pressure, and the pressure difference between the inside and outside of the box can be controlled within the range of 0.02-0.05Mpa by setting a reasonable elastic stiffness of the pressure compensator and oil filling Internally, when the external pressure changes, the volume of the oil will change slightly accordingly, which will rebalance the pressure inside and outside the shell, and the pressure difference will fluctuate slightly, so the pressure compensator makes the pressure inside the shell follow the external pressure at any time Changes and guarantee the required differential pressure. Volume compensation means that during the use of the transformer, the insulating oil in the box will continue to expand with heat and contract with cold. Although the volume thermal expansion rate of the insulating oil is only 0.00075, when the oil volume is large, the oil volume caused by temperature changes The change cannot be ignored. In the absence of elastic compensation components, it will cause a large change in pressure and cause the transformer shell to bear a large unbalanced pressure. Between the non-operating state and the full-load operating state of the transformer, the temperature difference of the insulating oil is large. Large, the volume of oil in the two states changes greatly. When the volume of oil changes, the pressure compensator will deform to deal with the change of oil volume. Otherwise, the shell of the underwater transformer will bear a lot of pressure and the shell will be too large. Deformation leads to cracking, and some underwater transformers mainly use external pressure compensators to perform pressure compensation on the main body of the transformer.

In the underwater transformer, the iron core and winding of the transformer will generate a lot of heat during operation. In order to ensure that the iron core and winding of the transformer will not overheat and affect the working efficiency, heat dissipation should also be considered when designing the underwater transformer. The traditional heat dissipation method of underwater transformers is to provide heat sinks on the transformer shell, and the working principle of heat sinks is to conduct heat conduction. However, the heat dissipation efficiency of the heat sink is low. The use of heat sinks for heat dissipation not only requires high thermal conductivity of the material, but also requires high manufacturing processes to ensure that the contact area between the heat sink and the shell is maximized. Disadvantages of cooling methods.

Utility model content

Aiming at the above defects or improvement needs of the prior art, the utility model provides a natural convection heat dissipation underwater transformer, wherein combined with the characteristics of the underwater transformer itself, an underwater transformer that can realize natural convection heat dissipation is designed accordingly. Its key components, such as the shell, the transformer body and the structure of the convection heat dissipation components, and their specific setting methods are studied and designed, which can effectively solve the problem of low heat dissipation efficiency of the existing heat dissipation methods, and have the advantages of long heat exchange time, large heat transfer, The advantages of high heat dissipation efficiency are suitable for underwater oil and gas production systems.

In order to achieve the above purpose, the utility model proposes a natural convection heat dissipation underwater transformer, which includes a shell, a transformer body and a convection heat dissipation assembly, wherein:

The housing is a cavity structure with the upper end closed and the lower end open. The lower end opening of the housing is connected to the base. The base forms a closed space with the cavity structure of the housing. The closed space is filled with transformer oil. The housing The outer surface of the body is connected with a compensator;

The transformer body includes an iron core assembly, a transformer input end and a transformer output end. The iron core assembly is arranged in the enclosed space and installed on the base, and includes an iron core and a coil wound on the iron core a winding, the transformer input terminal and the transformer output terminal are arranged on the housing;

The convection heat dissipation assembly includes several convection heat dissipation pipes arranged in a circle around the outside of the casing, each of the convection heat dissipation pipes is vertically arranged, and its two ends are connected with the casing to lead to the enclosed space. In this way, several convection cooling pipes are also filled with transformer oil.

As a further preference, the compensator is specifically a bellows compensator. The bellows compensator includes an upper section, a middle section and a lower section. The housing is in contact with but not communicated with, and its lower end communicates with the middle section; the middle section includes a hollow tube connected with the lower end of the upper section and a corrugated tube arranged in the hollow tube, and the upper end of the corrugated tube communicates with the upper section. The lower end is connected to the upper end of the lower section, and the lower end of the lower section communicates with the inside of the housing.

As a further preference, the underwater transformer further includes a monitoring cabin, which is arranged on the top of the housing and includes two sections of cylinders welded to each other.

As a further preference, reinforcing ribs are provided inside the housing to support the monitoring cabin on the top.

As a further preference, bolt holes are opened on the base, through which the underwater transformer is integrally fixed on the base.

Generally speaking, compared with the prior art, the above technical solution conceived by the utility model mainly has the following technical advantages:

1. The outer side of the underwater transformer shell of the utility model is provided with a number of convective heat dissipation pipes and compensators. The convective heat dissipation pipes are arranged in a circle around the shell for one week. They are all filled with transformer oil, and there is always a temperature difference between the transformer oil inside the transformer and the transformer oil in the convection heat pipe. The inside of the shell and the circulation between the convection heat pipes, and the heat exchange between the convection heat pipe wall and the seawater to dissipate heat. This spontaneous heat dissipation method does not require a special circulation pump, and the natural convection heat dissipation method is relatively less than the heat conduction of traditional heat sinks. In other words, it has the advantages of long heat exchange time and large heat transfer, effectively improving the overall heat dissipation efficiency of the underwater transformer.

2. The utility model disperses most of the transformer oil inside the transformer shell to each convective heat pipe by setting the convection heat pipe filled with transformer oil inside, effectively reducing the overall size of the transformer shell, from the design, From the perspective of manufacturing, management and maintenance, it is simpler and more convenient.

3. The underwater transformer of the present utility model has a fully enclosed structure. The iron core assembly is placed on the transformer base. The shell, convection heat pipe, bellows compensator and monitoring cabin form an integral assembly. After the assembly of the entire assembly is completed, pass through The housing in the overall assembly is welded on the base to achieve overall installation, so as to achieve a fully enclosed state and be maintenance-free for a long time.

Description of drawings

Fig. 1 is a perspective view of a natural convection heat dissipation underwater transformer provided by an embodiment of the present invention;

Fig. 2 is a front sectional view of a natural convection heat dissipation underwater transformer provided by the embodiment of the present invention;

Fig. 3 is an internal top view of a natural convection heat dissipation underwater transformer provided by an embodiment of the present invention;

Fig. 4 is a schematic structural view of the iron core assembly of the present invention;

Fig. 5 is a structural schematic diagram of a bellows compensator of the present invention;

Fig. 6 is a schematic structural view of the monitoring cabin of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

As shown in Fig. 1-3, a natural convection heat dissipation underwater transformer provided by the embodiment of the utility model includes a casing 1, a transformer body and a convection heat dissipation assembly, wherein the casing 1 is a hollow space with an upper end closed and a lower end open. Cavity structure, the lower end opening of the housing is connected to the base 7, thereby forming a closed space through the upper surface of the base and the interior of the cavity structure of the housing, the closed space is filled with transformer oil (insulating oil), and the housing The outer surface of the body is connected with a compensator 6. Specifically, the shell and the base are welded to achieve a fully enclosed state; the transformer body includes an iron core assembly 2, a transformer input end and a transformer output end, and the iron core assembly is located in the airtight Space, and installed on the base, specifically installed vertically, the iron core assembly includes the iron core and the coil winding wound on the iron core, the transformer input end and the transformer output end are arranged on the shell, specifically, the transformer input One end of the terminal and the output end of the transformer is connected to the coil winding, and the other end is respectively connected to two power connectors 5 arranged on the casing, and the two power connectors 5 are connected to the external power lines to provide power for the transformer; the convection cooling assembly includes Some convection heat pipes 4, as shown in Figure 3, some convection heat pipes are arranged in a circle around the outside of the housing, and a single convection heat pipe is vertically installed (that is, arranged vertically outside the housing), and the convection heat pipes Both ends are connected to the shell to communicate with the closed space (that is, to communicate with the inside of the shell), so that several convective heat pipes are also filled with transformer oil, and the transformer oil in the convective heat pipes is filled through the tube walls of the convective heat pipes. Realize heat exchange with seawater, wherein, it is preferable to make the convection heat pipes be arranged in a circle and evenly surround the shell for a week, and the number of heat flow pipes 4 can be set according to actual needs, such as 1, 2, 5, 8 Wait.

In the underwater transformer with the above structure of the utility model, since the transformer oil inside the transformer housing absorbs the heat generated when the iron core assembly is working, and the transformer oil in the convection cooling tube transfers heat through the tube wall to fully exchange heat with seawater , so that there is always a temperature difference between the transformer oil inside the transformer and the transformer oil in the convection heat pipe. The oil temperature inside the shell is high and the density is low. Where the two are connected at the bottom of the tube, the side pressure of the convective cooling tube is higher than the internal pressure of the transformer shell, thereby driving the transformer oil to circulate continuously between the inside of the transformer shell and the convective cooling tube, and exchanging heat with seawater to dissipate heat. This spontaneous heat dissipation method does not require a special circulating pump, and the natural convection heat dissipation method has high heat dissipation efficiency, which is simpler and more convenient from the perspectives of design, manufacture, management and maintenance.

Further, as shown in Figure 5, the compensator is preferably a bellows compensator, the bellows compensator includes an upper section 61, a middle section 62 and a lower section 63, the upper section is a circular tube, and the upper end of the upper section is provided with a hole communicating with sea water, And the upper end of the upper section is in contact with the outer surface of the shell but not communicated, and the lower end of the upper section communicates with the middle section to introduce seawater pressure into the middle section; the middle section includes a hollow circular tube communicating with the lower end of the upper section and a The corrugated tube inside the tube (that is, the hollow round tube is set outside the corrugated tube), and there is a certain space between the corrugated tube and the hollow tube to facilitate the volume change of the corrugated tube. The upper section is isolated), and the lower end of the bellows is connected to the upper end of the lower section, for example, through a flange. Since the upper section is connected to the hollow circular pipe in the middle section and is isolated from the upper end of the bellows in the middle section, seawater is led to the bellows and the bellows through the holes in the upper section. In the space between the hollow round tubes, the pressure adjustment is realized; the lower end of the lower section communicates with the interior of the transformer housing (that is, is isolated from seawater), and the lower section is also a round tube. The purpose of the compensator is to connect the lower section with the bellows The interior is filled with transformer oil for pressure compensation, thereby compensating the pressure difference between the inside and outside of the transformer shell.

In order to facilitate the monitoring of the underwater transformer, the underwater transformer of the present utility model can also be provided with a monitoring cabin, as shown in Figures 1 and 6, the monitoring cabin is arranged on the top of the housing, which includes two sections of cylinders welded to each other, It is used for arranging cables and electronic monitoring equipment. The monitoring cabin is designed into two sections of cylinders, which is conducive to the arrangement of cables and the installation of electronic monitoring equipment, and facilitates the welding between the two parts. The electronic monitoring equipment and the inner part of the transformer The temperature sensor is connected to realize the temperature monitoring of the transformer. Preferably, the monitoring cabin is connected to the top of the transformer housing through joints. In order to facilitate the smooth installation of the monitoring cabin, an interface for connecting with the joint is reserved on the top of the transformer housing. In order to facilitate external monitoring of the transformer, a connecting piece is provided on the monitoring cabin. One end of the connecting piece is connected with the electronic monitoring equipment in the monitoring cabin, and the other end is connected with the outside world, so as to facilitate external monitoring of the transformer. In order to facilitate the effective support of the monitoring cabin, reinforcing ribs such as four reinforcing ribs are provided inside the casing to support the monitoring cabin on the top. In addition, bolt holes are provided on the base, through which the underwater transformer is integrally fixed on the base.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (5)

1. a kind of underwater transformer of Natural Heat Convection formula, it is characterised in that including housing, transformer body and heat loss through convection group Part, wherein：

The housing is the cavity structure of upper end closed lower ending opening, and the lower ending opening of the housing is connected with base, the base and Housing hollow structure is internally formed a confined space, and transformer oil is full of in the confined space, and the lateral surface of the housing connects It is connected to compensator；

The transformer body includes core assembly, transformer inputs and transformer output end, and the core assembly is located at described In confined space, and on the base, its coil windings for including iron core and being wrapped on the iron core, the transformer Input and transformer output end are set on the housing；

The heat loss through convection component includes some heat loss through convection pipes that circumferentially arrangement is looped around the hull outside, described in every Heat loss through convection pipe is arranged vertically, and its both ends is connected to be turned on the confined space with the housing, with this so that some right Transformer oil is also filled with wandering heat pipe.

2. the underwater transformer of Natural Heat Convection formula as claimed in claim 1, it is characterised in that the compensator is specially ripple Line pipe compensator, the corrugated expansion joint include epimere, stage casing and hypomere, and the epimere is pipe, and its upper end offers and sea The hole of water connection, and its upper end contacts with the housing but not connected, and its lower end connects with the stage casing；The stage casing includes The hollow circular tube connected with the lower end of epimere and the bellows being arranged in the hollow circular tube, the upper end of the bellows and institute State epimere not connect, its lower end is connected with the upper end of the hypomere, and the lower end of the hypomere connects with the inside of housing.

3. the underwater transformer of Natural Heat Convection formula as claimed in claim 1 or 2, it is characterised in that the underwater transformer is also Including monitoring cabin, the monitoring cabin is arranged on the top of the housing, and it includes two sections of cylinders being welded to one another.

4. the underwater transformer of Natural Heat Convection formula as claimed in claim 3, it is characterised in that the inside of the housing is provided with Reinforcement is with the monitoring cabin of branch support.

5. the underwater transformer of Natural Heat Convection formula as claimed in claim 4, it is characterised in that offer spiral shell on the base Keyhole, underwater transformer is integrally attached in substrate by bolt.