Early-stage steam distributing and guiding equipment for steam turbine
By installing a branching device on the turbine air supply pipe and using a sealed solenoid valve and a flow control valve pipe to control the steam flow, the steam forms a reflux in the preheating return heat conduction hood, and the heat absorber and heating ring store and transfer the heat of the steam, which solves the problems of steam resource waste and difficulty in quickly heating the pipeline, and improves the turbine startup efficiency.
Patent Information
- Application Number
- CN202511309804.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2025-10-17
AI Technical Summary
Existing steam turbines require steam above 300°C when starting, but the steam temperature needs to rise slowly, resulting in the early low-temperature steam often being directly discharged and wasted. Moreover, the continuous flow of steam after diversion makes it difficult to quickly heat up and preheat, affecting the startup efficiency.
By installing a branching device on the turbine air supply pipe, and using a sealed solenoid valve and a flow control valve pipe to control the steam flow, the steam forms a reflux in the preheating return heat conduction cover, and the heat of the steam is stored and transferred through the heat absorbing plate and the heating ring to achieve pipe preheating.
It solves the problems of steam resource waste and difficulty in quickly heating up pipelines, and improves the turbine startup efficiency.
Smart Images
Figure CN120798459A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of pipeline, in particular to a steam turbine early stage steam diversion equipment. BACKGROUND
[0002] Steam turbine is a rotating steam power device, using high temperature and high pressure steam as working medium, steam flows through fixed nozzle expansion and acceleration, forming high-speed airflow injection to rotating blade row, driving the rotor with blades to rotate, converting heat energy into mechanical energy, as the core equipment of thermal power plant, its rotor is connected with generator through main shaft, driving power generation, compact structure, stable efficiency, supporting large-scale energy conversion of power system.
[0003] However, the prior art has the following disadvantages: current steam turbine needs to be connected with 300 DEG C or more steam when starting, but steam temperature rise needs a slow process, resulting in that the early stage low temperature steam is often directly discharged and wasted, in order to utilize this part of steam, although the diversion method is tried to be used, but because the steam continues to flow after diversion, the steam pipeline is difficult to be quickly heated and preheated, this contradiction not only causes steam resource waste, but also cannot complete the slow heating preparation required by the pipeline, restricting the starting efficiency. SUMMARY
[0004] Other features and advantages of the present application will be set forth in the following specification, and in part will become apparent to those skilled in the art upon examination of the specification or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the specification as well as in the claims.
[0005] The present application aims to overcome the above-mentioned deficiencies, and provides a steam turbine early stage steam diversion equipment, by connecting the gas guide pipe with the steam turbine gas supply pipe, in the process of use, the steam which does not meet the requirements of the steam turbine in the early stage is closed by the sealing electromagnetic valve, so that the steam is formed by the diversion pipe, and then the steam is used for other equipment.
[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: a steam turbine early stage steam diversion equipment, comprising a steam turbine gas supply pipe, an even number of connection gas pipes are installed on the steam turbine gas supply pipe, an even number of flow control valve pipes are installed on the connection gas pipes, sealing electric valves are installed on the connection gas pipes, a gas guide pipe is connected with one end of the steam turbine gas supply pipe, a diversion pipe is connected with the other end of the steam turbine gas supply pipe, a compensation pipe frame is installed on the diversion pipe; a pipe body is arranged in the gas guide pipe, a preheating return heat shield is fixed on the upper surface of the pipe body, a trigger sealing element is installed at one end of the preheating return heat shield; a pipe sealing valve is installed on the diversion pipe, and a pipe flow control valve pipe is fixed on the outer wall of the diversion pipe.
[0007] Further, the preheating return heat shield is provided with an even number of converging holes, and an internal intercommunication cavity is formed in the preheating return heat shield, a plurality of pipe wall heating rings are arranged at the middle section of the internal intercommunication cavity, and a plurality of heat absorbing fins are arranged on both sides of the pipe wall heating ring.
[0008] Further, the pipe wall heating ring is provided with a hollow ring, a heat exchange block is arranged at the center of the hollow ring, air inlet grooves are arranged on the hollow ring, and a plurality of air outlet holes are arranged on the side wall of the hollow ring.
[0009] Further, the hollow ring is attached to the inner surface of the pipe body, the heat exchange block is partially arranged in the pipe body and partially arranged in the internal intercommunication cavity, the converging holes are used for the intercommunication between the internal intercommunication cavity and the inside of the pipe body, the heat absorbing fins are arranged between the internal intercommunication cavity and the pipe body, and the trigger sealing element is fixed to the pipe body.
[0010] Further, the trigger sealing element is provided with a sealing block, an air inlet is arranged below the sealing block, a sealing plug is arranged on the sealing block, an auxiliary sealing nest plug is embedded on the sealing block, an inclined air guide groove is arranged in the sealing block, and an interconnection groove is arranged on the inclined air guide groove.
[0011] Further, an even number of connecting barrels are arranged in the sealing plug, fixed plug rods are arranged on the even number of connecting barrels, a fixed adjusting plate is arranged between the fixed plug rods, a sealing plate body is fixed below the fixed adjusting plate, and an even number of rotating nuts are arranged on the fixed plug rods.
[0012] Further, a plate body side sealing strip is arranged on both sides of the sealing plate body, and a lower convex sealing block is arranged at the bottom of the sealing plate body.
[0013] Further, the lower convex sealing block is nested in the air inlet, the plate body side sealing strip cooperates with the auxiliary sealing nest plug, the rotating nuts are used for height adjustment of the fixed adjusting plate, and the connecting barrels are fixed to the surface of the sealing block.
[0014] Further, the sealing plate body cooperates with the inclined air guide groove, the inclined air guide groove is used for the intercommunication between the inclined air guide groove and the interconnection groove, and the interconnection groove is connected with the internal intercommunication cavity. Advantages
[0015] Compared with the prior art, the present application has the following advantages: 1. The application is by sub-conduit in the early steam outside guide, steam in the preheating return guide cover on the pipe body to form a backflow, and then let the steam into the air inlet, cooperate with the opening of the sealing plug, make it reverse transport into the cover intercommunication cavity, respectively by the heat absorbing sheet and the heat absorbing sheet to sub-guide the steam, make its heat stored on the two, so as to realize the temperature keeping of the pipe body, solve the pipeline difficult to preheat, indirectly improve the starting efficiency.
[0016] 2. The application is by adjusting the trigger seal, when the heat needs to work in the steam turbine, adjusting the rotating nut on the fixed plug rod, driving the sealing plug plate below the fixed adjusting plate to insert into the inclined air guide groove, and then embedding the bottom in the surface of the air inlet, so as to realize the closure of the inclined air guide groove, avoid the sub-guide of steam when the steam turbine is opened. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a structure diagram of the steam turbine early steam sub-guide equipment of the application; Figure 2 It is a side view structure diagram of the sub-guide pipe in the steam turbine early steam sub-guide equipment of the application; Figure 3 It is a local cross-section structure diagram of the sub-guide pipe in the steam turbine early steam sub-guide equipment of the application; Figure 4 It is an internal section structure diagram of the pipe body in the steam turbine early steam sub-guide equipment of the application; Figure 5 It is a three-dimensional structure diagram of the pipe wall heating ring in the steam turbine early steam sub-guide equipment of the application; Figure 6 It is a front view structure diagram of the trigger seal in the steam turbine early steam sub-guide equipment of the application; Figure 7 It is a three-dimensional structure diagram of the sealing plug in the steam turbine early steam sub-guide equipment of the application; Figure 8 It is a side section structure diagram of the sealing block in the steam turbine early steam sub-guide equipment of the application.
[0018] In the figure: steam turbine air supply pipe 1, connecting air supply pipe 2, flow control valve pipe 3, sealing electric control valve 4, air guide pipe 5, compensation pipe bracket 6, branch guide pipe 7, pipe body 51, preheating return guide heat shield 52, trigger sealing element 53, guide pipe sealing valve 71, guide pipe flow control valve pipe 72, confluence hole 521, heat absorbing sheet 522, intercommunicating cavity in the shield 523, pipe wall heating ring 524, sealing block body 531, air inlet 532, sealing insert 533, auxiliary sealing nest insert block 5311, inclined air guide groove 5312, interconnecting groove 5313, hollow ring 5241, heat exchange block 5242, air inlet groove 5243, exhaust hole 5244, connecting cylinder 5331, fixed insertion rod 5332, fixed adjusting plate 5333, sealing plate body 5334, screw nut 5335, plate body side sealing strip 53341, lower convex sealing block 53342. DETAILED DESCRIPTION
[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not used to limit the present application.
[0020] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0021] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. However, it is noted that direct connection means that the connection between the two main bodies does not pass through a transition structure to establish a connection relationship, but only connects through a connecting structure to form an integral whole. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0022] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.
[0023] The present application is further described below in conjunction with the accompanying drawings: Embodiment 1
[0024] As shown in the accompanying drawings: Figure 1 to the accompanying drawings: Figure 5 As shown in the accompanying drawings: Figure 1 is a schematic structural diagram of a steam diversion device for a steam turbine in an early stage of the present application; Figure 2 is a schematic structural diagram of a side view of a diversion pipe in a steam diversion device for a steam turbine in an early stage of the present application; Figure 3 is a schematic structural diagram of a local cross-sectional perspective view of a diversion pipe in a steam diversion device for a steam turbine in an early stage of the present application; Figure 4 is a schematic structural diagram of an internal cross-sectional view of a pipe body in a steam diversion device for a steam turbine in an early stage of the present application; Figure 5 is a schematic structural diagram of a perspective view of a pipe wall heating ring in a steam diversion device for a steam turbine in an early stage of the present application.
[0025] The embodiment provides a steam turbine early-stage steam distribution device, which comprises a steam turbine air supply pipe 1, an even number of connecting air supply pipes 2 are installed on the steam turbine air supply pipe 1, control valve pipes 3 are installed on the even number of connecting air supply pipes 2, sealing electric control valves 4 are installed on the connecting air supply pipes 2, a gas guide pipe 5 is connected to one end of the steam turbine air supply pipe 1, a distribution pipe 7 is connected to the other end of the steam turbine air supply pipe 1, and a compensation pipe bracket 6 is installed on the distribution pipe 7; a pipe body 51 is arranged in the gas guide pipe 5, a preheating return heat shield 52 is fixed to the upper surface of the pipe body 51, a trigger sealing element 53 is installed at one end of the preheating return heat shield 52; a pipe sealing valve 71 is installed on the distribution pipe 7, and a pipe control valve pipe 72 is fixed to the outer wall of the distribution pipe 7. An even number of converging holes 521 are formed in the preheating return heat shield 52, an internal intercommunication cavity 523 is formed in the preheating return heat shield 52, a plurality of pipe wall heating rings 524 are installed at the middle section of the internal intercommunication cavity 523, and a plurality of heat absorption sheets 522 are arranged on the two sides of the pipe wall heating ring 524. A hollow ring 5241 is arranged in the pipe wall heating ring 524, a heat exchange block 5242 is installed in the middle of the hollow ring 5241, an air inlet groove 5243 is formed in the hollow ring 5241, and a plurality of air outlet holes 5244 are formed in the side wall of the hollow ring 5241.
[0026] Further, the control valve pipe 3 is mainly installed on the side wall of the connecting air supply pipe 2 and is provided with at least two manual valves; by opening the valves, part of the steam can be slowly supplied to complete the preheating work of the connecting air supply pipe.
[0027] Further, the distribution pipe 7 is mainly used for distributing the steam of the steam turbine in the early stage, and the steam is transported to the connected slaughterhouse for use before the steam turbine startup demand is met, so as to avoid direct discharge of the steam and waste of resources.
[0028] Further, the pipe control valve pipe 72 is mainly used for outputting a small part of steam, so that the steam slowly heats the pipe, thereby avoiding the disadvantageous influence of rapid heating of the steam on the pipe when the steam is directly input.
[0029] Further, the converging hole 521 is formed at the end of the preheating return heat shield 52 and is directly below the pipe body 51, so that the steam in the internal intercommunication cavity 523 is converged into the pipe body 51.
[0030] Further, the heat absorption sheet 522 is mainly used for absorbing heat between the internal intercommunication cavity 523 and the pipe body 51, so that the heat is transmitted to the inner wall of the pipe body 51 to heat the pipe body 51, so that the subsequent high-temperature steam for the steam turbine is not affected by the instantaneous high temperature.
[0031] Further, the pipe wall heating ring 524 is provided with several, which are arranged in the intercommunication cavity 523 in the cover by a linear arrangement, and the hollow ring 5311 is attached to the inner wall of the pipe body 51 to heat and keep the heat.
[0032] Further, the heat exchange block 5242 is arranged from low to high near the sealing block body 531, so that the steam introduced from the sealing block body 531 can enter the air inlet groove 5243, complete the steam diversion, and absorb the heat at the same time, realize heat conduction.
[0033] The specific working principle is as follows: The present application connects several air guide pipes 5 to the steam turbine air supply pipe 1 at the final end, thereby realizing the supply of steam. When the steam does not meet the opening temperature of the steam turbine, the sealing electric control valve 4 is closed, the manual valve on the flow control valve pipe 3 is opened, a small part of the steam is input to preheat the connected air supply pipe 2, and after the sealing electric control valve 4 is closed, the steam is output from the diversion pipe 7 on the compensation pipe frame 6, thereby being input into the connected air supply pipe in the slaughter factory, and the steam flows into the air inlet 532 on the pipe body 51, cooperates with the opening of the sealing plug 533, and flows back into the intercommunication cavity 523 in the preheating return heat cover 52, thereby the heat absorbing sheet 522 arranged in the intercommunication cavity 523 absorbs the heat of the steam, completes the heat transfer of the pipe body 51, and the steam entering the air inlet groove 5243 is input into the hollow ring 5241, the heat is transferred to the inner wall of the pipe body 51 by the heating of the hollow ring 5241, the heat is warmed, so as to input the high temperature steam, and the steam is recombined into the pipe body 51 through the exhaust hole 5244 and the flow hole 521 arranged at the rear, thereby realizing the heat absorption and transfer of the pipe body 51, keeping the heat temperature and rising at the same time, solving the problem of difficult preheating of the pipe, and indirectly improving the starting efficiency. Example 2:
[0034] As shown in the accompanying Figure 6 to the accompanying Figure 8 : Figure 6 It is a front view structure diagram of the trigger sealing element in the steam turbine early steam diversion equipment of the present application; Figure 7 It is a three-dimensional structure diagram of the sealing plug in the steam turbine early steam diversion equipment of the present application; Figure 8 It is a side sectional view structure diagram of the sealing block body in the steam turbine early steam diversion equipment of the present application.
[0035] The trigger seal 53 is provided with a sealing block 531, below which is an air inlet 532. A sealing insert 533 is mounted on the sealing block 531, and an auxiliary sealing insert 5311 is embedded in the sealing block 531. The sealing block 531 is provided with an inclined air guide groove 5312, and interconnecting grooves 5313 are provided on the inclined air guide grooves 5312. An even number of connecting tubes 5331 are located within the sealing insert 533, and fixed rods 5332 are mounted on these even numbered connecting tubes 5331. A fixed adjustment plate 5333 is located between the fixed rods 5332. A sealing plate 5334 is fixed below the fixed adjustment plate 5333, and an even number of screw nuts 5335 are mounted on the fixed rods 5332. Side seals 53341 are provided on both sides of the sealing plate 5334, and a downwardly protruding sealing block 53342 is located at the bottom of the sealing plate 5334.
[0036] Furthermore, the sealing block 531 is fixed to the surface of the tube body 51, and collects part of the steam through the air inlet 532 below, and cooperates with the inclined air guide groove 5312 and the interconnecting groove 5313 to transfer its heat into the interconnecting cavity 523 in the cover.
[0037] Furthermore, the surface of the air inlet 532 is inclined, so that the bottom of the sealing plate 5334 of the sealing gasket is adapted to its shape, and at the same time, a downward convex sealing block 53342 is provided to provide high tightness for its sealing.
[0038] Furthermore, the auxiliary seal nested plug-in block 5311 is mainly used to adapt to the sealing plate 5334 to form a seal, so that when the turbine steam is sufficient, its air inlet 532 is closed to prevent the steam from being conducted out, and to fully supply air to the connected gas pipe 2.
[0039] Furthermore, the fixed rod 5332 is inserted into the connecting tube 5331, and the two are fixed by screwing, and the fixed adjustment plate 5333 is fixed by the fixed rods 5332 at both ends, so that the fixed adjustment plate 5333 and the sealing plate body 5334 can be displaced on the fixed rods 5332.
[0040] Furthermore, the two sets of screw nuts 5335 installed on the fixed plug rod 5332 are mainly used to adjust the height of the fixed adjustment plate 5333, thereby cooperating with the fixed plug rod 5332 to complete the locking of the fixed plate 5333 and prevent it from displacement.
[0041] Furthermore, the plate side seal 53341 is mainly used to adapt to the plate side seal 53341 to engage and form a seal reinforcement, thereby preventing the internal high-temperature steam from leaking directly from the auxiliary seal nesting block 5311.
[0042] The specific working principle is as follows: The present application adjusts the sealing plug 531 on the pipe body 51, when the steam supply does not meet the opening condition of the steam turbine, adjusts the fixed adjusting plate 5333 in the fixed plug 5332 on the connecting cylinder 5331, and after adjusting the rotating nut 5335, completes the lifting of the sealing plate body 5334, opens the inclined air guide groove 5312, and makes the air inlet 532 and the interconnecting groove 5313 intercommunicate, so that the steam enters the intercommunication cavity in the steam input cover. With the slow warming of the steam, when the steam turbine driving temperature is met, the fixed adjusting plate 5333 is operated in reverse, the sealing plate body 5334 closes the inclined air guide groove 5312, and the lower convex sealing block 53342 at the end completes the inlaid sealing of the surface of the air inlet 532, so that the steam enters the steam turbine, and the steam turbine is started and operated.
[0043] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but extend to equivalent alternatives of such features as understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.
[0044] The term "embodiment" mentioned in the specification means that the specific features or characteristics described in connection with the embodiment are included in at least one embodiment of the present application. Therefore, the phrase "embodiment" or "embodiment" appearing throughout the specification does not necessarily mean the same embodiment.
[0045] In addition, the described features or characteristics can be combined in one or more embodiments in any other suitable manner. In the above description, some specific details, such as thickness, number, etc., are provided to provide a comprehensive understanding of the embodiments of the present application. However, those skilled in the relevant art will understand that the present application can be implemented without the above one or more specific details or can be implemented using other methods, components, materials, etc.
Claims
1. A steam turbine early stage steam diversion device, characterized in that: The invention comprises a steam turbine air supply pipe (1), an even number of connecting air supply pipes (2) are installed on the steam turbine air supply pipe (1), a flow control valve pipe (3) is installed on each of the even number of connecting air supply pipes (2), a sealing electric control valve (4) is installed on each of the connecting air supply pipes (2), one end of the steam turbine air supply pipe (1) is connected to an air guide pipe (5), the other end of the steam turbine air supply pipe (1) is connected to a branch pipe (7), and a compensation pipe rack (6) is installed on the branch pipe (7); A tube body (51) is provided in the air guide tube (5), a preheating return heat conductive cover (52) is fixed on the upper surface of the tube body (51), and a trigger seal (53) is installed at one end of the preheating return heat conductive cover (52); A conduit sealing valve (71) is installed on the branch conduit (7), and a conduit flow control valve tube (72) is fixed to the outer wall of the branch conduit (7).
2. The early stage steam diversion device of a steam turbine according to claim 1, characterized in that: An even number of confluence holes (521) are provided on the preheating return heat conductive cover (52), an inner cover intercommunication cavity (523) is formed in the preheating return heat conductive cover (52), a plurality of pipe wall heating rings (524) are installed in the middle of the inner cover intercommunication cavity (523), and a plurality of heat absorbing sheets (522) are provided on both sides of the pipe wall heating rings (524).
3. The early stage steam diversion device of a steam turbine according to claim 2, characterized in that: A hollow ring (5241) is provided inside the tube wall heating ring (524), a heat exchange block (5242) is installed in the center of the hollow ring (5241), an air inlet groove (5243) is provided on the hollow ring (5241), and a plurality of exhaust holes (5244) are provided on the side wall of the hollow ring (5241).
4. The early stage steam diversion device of a steam turbine according to claim 3, characterized in that: The hollow ring (5241) is fitted to the inner surface of the tube body (51); the heat exchange block (5242) is partially arranged in the tube body (51), and the remaining portion is arranged in the intercommunication cavity (523) in the cover; the confluence hole (521) is used for the intercommunication cavity (523) in the cover to communicate with the inside of the tube body (51); the heat absorption plate (522) is arranged between the intercommunication cavity (523) in the cover and the tube body (51); and the trigger seal (53) is fixed on the tube body (51).
5. The early stage steam diversion device of a steam turbine according to claim 4, characterized in that: A sealing block (531) is provided in the trigger seal (53), an air inlet (532) is provided below the sealing block (531), a sealing plug-in (533) is installed on the sealing block (531), an auxiliary sealing nesting plug-in (5311) is embedded in the sealing block (531), an oblique air guide groove (5312) is provided in the sealing block (531), and an interconnecting groove (5313) is provided on the oblique air guide groove (5312).
6. The early stage steam diversion device of a steam turbine according to claim 5, characterized in that: An even number of connecting tubes (5331) are provided in the sealing plug (533), and fixed plug rods (5332) are installed on the even number of connecting tubes (5331). A fixed adjustment plate (5333) is provided between the fixed plug rods (5332), a sealing plate body (5334) is fixed below the fixed adjustment plate (5333), and an even number of screw nuts (5335) are installed on the fixed plug rods (5332).
7. The early stage steam diversion device of a steam turbine according to claim 6, characterized in that: Both sides of the sealing plate body (5334) are provided with plate body side sealing strips (53341), and the bottom of the sealing plate body (5334) is provided with a downward convex sealing block (53342).
8. The early stage steam diversion device of a steam turbine according to claim 7, characterized in that: The lower convex sealing block (53342) is nested in the air inlet (532), the plate side seal (53341) cooperates with the auxiliary sealing nested plug-in block (5311), the screw-on nut (5335) is used to adjust the height of the fixed adjustment plate (5333), and the connecting tube (5331) is fixed to the surface of the sealing block body (531).
9. The early stage steam diversion device of a steam turbine according to claim 6, characterized in that: The sealing plate body (5334) cooperates with the oblique air guide groove (5312); the oblique air guide groove (5312) is used for interconnection between the oblique air guide groove (5312) and the interconnection groove (5313); and the interconnection groove (5313) is connected to the interconnection cavity (523) in the cover.