Explosion-proof structure of SOFC power generation system control box

Abstract

The utility model relates to control box casing technical field, specifically disclose a kind of explosion-proof structure of SOFC power generation system control box, comprising: casing;Partition, respectively symmetrically set in the two sides of the casing inner wall, and clearance is formed between two sides opposite partition;Sliding frame, with the partition sliding seal connection, and can the gap be blocked or be communicated, casing outside is equipped with the driving mechanism of driving sliding frame movement;Air release, set on the casing and with the casing inside intercommunication;When the sliding frame blocks clearance, the air release is in the state of blocking, and the sliding frame and the partition divide the casing into multiple independent chambers, chamber is filled with reaction substance respectively, to solve the explosion-proof structure of current SOFC power generation system control box Lack of active response, effectively suppress the risk of explosion and have redundancy backup protection and other related performance to be promoted problem.

Description

Technical Field

[0001] This application relates to the field of control box housing technology, and specifically discloses an explosion-proof structure for an SOFC power generation system control box. Background Technology

[0002] SOFC power generation systems typically include a fuel cell stack, a fuel processing unit, an air supply unit, and a control unit. The control unit manages key parameters such as system temperature, gas flow rate, pressure, and power output, and integrates numerous electrical components, circuit boards, sensors, and actuators.

[0003] Currently, explosion-proof measures for SOFC power generation system control boxes often involve increasing the thickness of the metal walls of the control box and adding reinforcing ribs to improve its structural strength, enabling it to withstand the pressure generated by an internal explosion without rupturing. Alternatively, high-quality sealing gaskets and sealed joints can be added to enhance the sealing performance of the box, aiming to isolate flammable gases outside the box or prevent internal flames from spreading outwards.

[0004] However, whether it is strengthening the structural strength or increasing the sealing, the essence is to physically contain the explosion or deflagration after it has already occurred. It cannot take proactive measures to prevent the formation of a dangerous state during the incubation stage of an explosion, that is, when an abnormal increase in temperature inside the box is detected.

[0005] When the environment inside the enclosure becomes dangerous, the existing structure cannot actively change the gas atmosphere inside the enclosure or physically isolate potential heat sources. For example, when the temperature inside the enclosure rises abnormally due to an electrical fault, it cannot actively release inert gas to dilute the concentration of oxygen and combustible gases, nor can it actively cover and cool the heat-generating components, leaving the situation to escalate to an uncontrollable deflagration stage.

[0006] Furthermore, in the event of an extreme high-temperature fault causing the electronic monitoring and control circuits inside the control box to fail, the active safety measures that rely on electronic signal triggering will also fail, leaving a gap in the system's safety defenses when facing the most extreme fault scenarios.

[0007] It is evident that the current explosion-proof structure of SOFC power generation system control boxes has shortcomings in terms of active response, effective suppression of explosion risks, and redundant backup protection, which need to be improved. Therefore, the inventors provide an explosion-proof structure for SOFC power generation system control boxes to solve the above problems. Utility Model Content

[0008] The purpose of this invention is to provide an explosion-proof structure that can actively respond, effectively suppress the risk of explosion, and has redundant backup protection, so as to improve the protection performance of the SOFC power generation system control box.

[0009] To achieve the above objectives, the basic solution of this utility model provides an explosion-proof structure for a control box of an SOFC power generation system, comprising:

[0010] case;

[0011] The partitions are symmetrically arranged on both sides of the inner wall of the shell, and a gap is formed between the opposing partitions on both sides;

[0012] The sliding frame is slidably and sealingly connected to the partition plate, and can block or connect the gap. The outer side of the housing is provided with a drive mechanism to drive the sliding frame to move.

[0013] A vent is provided on the housing and communicates with the interior of the housing;

[0014] When the sliding frame seals the gap, the vent is blocked, and the sliding frame and the partition divide the inside of the housing into multiple independent chambers, each filled with a reactive substance.

[0015] Furthermore, each of the partitions is provided with a corresponding sliding groove, the sliding frame is slidably connected to the sliding groove, and the vent is connected to the sliding groove.

[0016] Furthermore, the sliding frame has a first position and a second position:

[0017] When the sliding frame is in the first position, both ends of the sliding frame engage with the sliding grooves of the two side partitions to seal the gap between the partitions;

[0018] When the sliding frame is in the second position, one of the sliding frames disengages from the groove of the corresponding partition, connecting the gap between the partitions.

[0019] Furthermore, the depth of the partition near the outside of the control box is greater than the depth of the partition near the inside of the control box.

[0020] Furthermore, the drive mechanism includes:

[0021] A guide shaft, one end of which is connected to the sliding frame, and the other end of which passes through the housing;

[0022] A connecting plate is fixed to the end of the guide shaft that extends out of the housing;

[0023] A linear drive unit is mounted on the outer wall of the housing, and its output end is connected to a wedge.

[0024] A mating component is disposed on the connecting plate and engages with the wedge block, used to convert the motion of the wedge block into the motion of the connecting plate along the axis of the guide shaft.

[0025] Furthermore, the linear drive component is one of a hydraulic cylinder, a pneumatic cylinder, or an electric telescopic rod.

[0026] Furthermore, the wedge is slidably connected to the outer wall of the housing, and a slide rail is provided on the outer wall of the housing to guide and limit the wedge.

[0027] Furthermore, the wedge block is provided with an inclined connecting groove, and the mating component is a ball bearing that is mounted on the connecting plate and rolls in cooperation with the connecting groove.

[0028] Furthermore, the drive mechanism also includes a spring, which is sleeved on the guide shaft and located between the sliding frame and the inner wall of the housing. The spring force biases the sliding frame toward the first position.

[0029] Furthermore, one of the partitions on one side is entirely or partially made of a fusible alloy plate, and the vent is opened when the fusible alloy plate melts.

[0030] The principle and effect of this solution are as follows:

[0031] 1. This invention features chambers separated by partitions, each filled with a chemical substance that reacts to generate an inert gas. A sliding frame and drive mechanism are used to bring the first and second reactants in different chambers into contact and react chemically, rapidly generating a large amount of carbon dioxide gas. This active triggering method effectively eliminates the risk of explosion, significantly improving the system's intrinsic safety.

[0032] 2. This utility model adopts a redundant safety architecture that combines electronic and purely mechanical triggering. It not only achieves precise active triggering through temperature probes and controllers with a fast response speed, but also provides ultimate protection in the event of electrical failure by using fusible alloys to construct some or all of the partitions. Utilizing purely mechanical fusion protection, it does not rely on any external energy source or control signal, fundamentally ensuring that the explosion-proof function can still reliably activate even in the most dangerous high-temperature runaway conditions.

[0033] 3. The explosion-proof structure of this utility model can be installed as an independent protective module inside an existing control box, or it can be directly integrated into the control box as part of the overall design. The structure is flexible and does not occupy excessive external space. Through the ingenious design of the shell, internal partitions, and sliding brackets, the storage of reactive materials, the triggering mechanism, and the reaction release channel are integrated into one compact and reasonable layout, making it very suitable for applications such as SOFC power generation system control boxes that have high requirements for space and reliability. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This paper shows a schematic diagram of one side of the explosion-proof structure of a control box for an SOFC power generation system according to an embodiment of this application;

[0036] Figure 2 This illustration shows a schematic diagram of the other side of the explosion-proof structure of a control box for an SOFC power generation system according to an embodiment of this application. Detailed Implementation

[0037] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0038] The reference numerals in the accompanying drawings include: first housing 1, second housing 2, sliding frame 3, connecting plate 4, vent 5, partition 6, ball bearing 7, slide groove 8, guide shaft 9, spring 10, temperature probe 11, linear drive component 12, guide rail 13, wedge block 14, connecting groove 15, and fusible alloy plate 16.

[0039] An explosion-proof structure for a control box of an SOFC power generation system is disclosed. This explosion-proof structure can be installed as an independent protective module inside the control box, or it can be directly formed as part of the control box body and constitute the wall of the box body.

[0040] Implementation, for example Figure 1 and Figure 2 As shown: The explosion-proof structure includes a housing, a partition 6 disposed inside the housing, a sliding frame 3 slidably connected inside the housing, a reactive substance filled inside the housing, and a drive mechanism for moving the sliding frame 3.

[0041] The housing is composed of a first housing 1 and a second housing 2 arranged symmetrically. The first housing 1 faces the wall of the control box or the external environment, and the second housing 2 faces the internal space of the control box. The first housing 1 and the second housing 2 are detachably fixedly connected by a plurality of bolts distributed circumferentially, and sealing rings are embedded on the contact surfaces of the two to ensure the airtightness of the internal space of the housing.

[0042] Multiple partitions 6 are respectively provided on the inner wall surfaces of the first housing 1 and the second housing 2. The partitions 6 on the first housing 1 and the second housing 2 correspond to each other when the housings are closed. The sum of the heights of all partitions 6 is less than the internal depth of the first housing 1 and the second housing 2 after they are combined, so that when the first housing 1 and the second housing 2 are fastened together, a laterally extending gap is formed between the partitions 6 on the first housing 1 and the partitions 6 on the second housing 2. The height direction of this gap is along the depth direction of the housings, and the width of the gap is less than the height of the partition 6 itself. In addition, each partition 6 has a through groove 8 in the middle along the height direction, and the corresponding groove 8 on the first housing 1 and the corresponding groove 8 on the second housing 2 are aligned after the housings are closed.

[0043] A sliding frame 3 is provided in the sliding groove 8 formed by the mating of the two side partitions 6. The two ends of the sliding frame 3 extend into the sliding groove 8 of the first housing 1 and the sliding groove 8 of the second housing 2, respectively, and are in sliding sealing fit with the inner wall of the sliding groove 8 by a sealing ring.

[0044] The sliding stroke of the sliding frame 3 is as follows: when the sliding frame 3 slides to its limit position towards the second housing 2, the end of the sliding frame 3 near the second housing 2 can completely disengage from the groove 8 of the second housing 2, thereby connecting the chamber where the groove 8 is located with other spaces inside the housing through the lateral gap between the disengaged part of the sliding frame 3 and the partition 6. When the sliding frame 3 is in its normal position, its two ends are respectively held in the two side grooves 8, sealing the gap between the partitions 6, so that the housing is divided into multiple independent chambers by the partitions 6 and the sliding frame 3.

[0045] To facilitate the installation and guidance of the sliding frame 3, a structure is adopted in which the height of the partition 6 on the inner wall of the second housing 2 is greater than the height of the partition 6 on the inner wall of the first housing 1, thereby providing more structural space for the sliding frame 3 to slide and seal.

[0046] The system consists of multiple independent chambers, each alternately filled with a first reactant and a second reactant. The first reactant is aluminum sulfate powder, and the second reactant is sodium bicarbonate solution. Under normal conditions, the aluminum sulfate powder and sodium bicarbonate solution reside in separate chambers separated by partition 6 and sliding frame 3, respectively, and do not come into contact with each other. Furthermore, the inner wall of the shell, the surface of partition 6, and the surface of sliding frame 3 are all treated with anti-corrosion measures to meet the long-term storage requirements of the reactants. Where the protective performance permits, aluminum sulfate solution can also be used as the first reactant to increase the rate of subsequent reactions.

[0047] The movement of the sliding frame 3 is controlled by a drive mechanism located outside the housing: multiple guide shafts 9 are fixedly connected to the surface of the sliding frame 3 facing the second housing 2, the guide shafts 9 penetrate the wall of the second housing 2 and engage with the second housing 2 through a sliding seal. The ends of all the guide shafts 9 extending outside the second housing 2 are fixedly connected to a connecting plate 4, so that the connecting plate 4 moves synchronously with the sliding frame 3. At least one linear drive element 12, such as a hydraulic cylinder, pneumatic cylinder, or electric telescopic rod, is also installed on the outer wall of the second housing 2, and a wedge 14 is connected to the output end of the linear drive element 12. The wedge 14 slides in engagement with a slide rail provided on the outer wall of the second housing 2 to limit the direction of movement of the wedge 14. An inclined connecting groove 15 is formed on the wedge 14, and a ball bearing 7, as a mating component, is installed at a corresponding position on the connecting plate 4, the ball bearing 7 being embedded in the connecting groove 15. When the linear drive 12 pushes the wedge 14 to move along the slide rail, the horizontal movement of the wedge 14 is converted into the vertical movement of the connecting plate 4 and the sliding frame 3 along the axis of the guide shaft 9 through the cooperation of the connecting groove 15 and the ball 7.

[0048] In order to ensure that the sliding frame 3 can reliably remain in the normal position of sealing the gap when not driven, a plurality of compression springs 10 are provided between the sliding frame 3 and the inner wall of the second housing 2. The springs 10 are sleeved on the corresponding guide shafts 9, and their elastic force always pushes the sliding frame 3 toward the first housing 1, so that the two ends of the sliding frame 3 are stably inserted into the sliding grooves 8 on both sides.

[0049] Multiple vents 5 are provided on the first housing 1, and the vents 5 are connected to the sliding groove 8 area inside the first housing 1. When the reactants inside the housing react and generate gaseous products, the generated gas can be quickly released into the internal space of the control box through the gap of the partition 6, the channel of the sliding groove 8 and the vents 5.

[0050] To achieve real-time monitoring and active response to the ambient temperature inside the control box, one or more temperature probes 11 are installed on or near the first housing 1. The temperature probes 11 are electrically connected to the controller inside the control box. The controller has a pre-stored temperature threshold. When the temperature probe 11 detects that the ambient temperature inside the control box is higher than the threshold, the controller sends an action command to the linear drive 12. The linear drive 12 drives the wedge 14 to move, which, through the connecting plate 4 and the guide shaft 9, drives the sliding frame 3 to slide towards the second housing 2 until the end of the sliding frame 3 disengages from the groove 8 of the second housing 2. At this point, the previously isolated chambers are connected by the pathway formed by the disengagement of the sliding frame 3, and the first and second reactants in different chambers quickly come into contact and undergo a chemical reaction. Taking aluminum sulfate and sodium bicarbonate as an example, the reaction produces a large amount of carbon dioxide gas and colloidal aluminum hydroxide precipitate. Carbon dioxide gas enters the control box through vent 5, rapidly diluting the concentration of oxygen and combustible gas inside the box and reducing the risk of explosion; the colloidal precipitate forms a dense insulating layer that both isolates oxygen and absorbs heat, thereby inhibiting the spread of fire and the tendency of temperature rise.

[0051] As a redundant safety measure, all or part of the partitions 6 inside the first housing 1 can be made of fusible alloy plates 16. The melting point of the fusible alloy plates 16 is selected based on the hazardous temperatures that the SOFC system may face. When an extreme fault causes the temperature inside the control box to rise sharply and exceed the melting point of the fusible alloy, the partitions 6 made of the fusible alloy will automatically melt and break. After the partitions 6 melt and break, the previously separated chambers are directly connected, and the first and second reactants come into contact and react without relying on any electrical control signals, generating carbon dioxide gas and colloidal precipitates, thus achieving explosion-proof and fire-extinguishing functions. This purely mechanical melting protection mechanism can still operate reliably in the event of a complete failure of the control system or a power outage, providing the ultimate passive safety redundancy for this explosion-proof structure.

[0052] Through the above structure, this utility model combines active triggering with passive redundancy, enabling it to respond quickly when an abnormal temperature occurs in the SOFC power generation system control box, actively release inert gas and form a physical isolation layer, significantly reducing the probability of explosion and improving the overall operational safety of the system.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An explosion-proof structure of a control box of a SOFC power generation system, characterized by comprising: include: case; The partitions are symmetrically arranged on both sides of the inner wall of the shell, and a gap is formed between the opposing partitions on both sides; The sliding frame is slidably and sealingly connected to the partition plate, and can block or connect the gap. The outer side of the housing is provided with a drive mechanism to drive the sliding frame to move. A vent is provided on the housing and communicates with the interior of the housing; When the sliding frame seals the gap, the vent is blocked, and the sliding frame and the partition divide the inside of the housing into multiple independent chambers, each filled with a reactive substance.

2. The explosion-proof structure of the SOFC power generation system control box according to claim 1, characterized in that, Each partition is provided with a corresponding sliding groove, the sliding frame is slidably connected to the sliding groove, and the vent is connected to the sliding groove.

3. The explosion-proof structure of the SOFC power generation system control box according to claim 2, characterized in that, The sliding frame has a first position and a second position: When the sliding frame is in the first position, both ends of the sliding frame engage with the sliding grooves of the two side partitions to seal the gap between the partitions; When the sliding frame is in the second position, one of the sliding frames disengages from the groove of the corresponding partition, connecting the gap between the partitions.

4. The explosion-proof structure of the SOFC power generation system control box according to claim 3, characterized in that, The depth of the partition near the outside of the control box is greater than the depth of the partition near the inside of the control box.

5. The explosion-proof structure of the SOFC power generation system control box according to claim 3, characterized in that, The drive mechanism includes: A guide shaft, one end of which is connected to the sliding frame, and the other end of which passes through the housing; A connecting plate is fixed to the end of the guide shaft that extends out of the housing; A linear drive unit is mounted on the outer wall of the housing, and its output end is connected to a wedge. A mating component is disposed on the connecting plate and engages with the wedge block, used to convert the motion of the wedge block into the motion of the connecting plate along the axis of the guide shaft.

6. The explosion-proof structure of the SOFC power generation system control box according to claim 5, characterized in that, The linear drive component is one of a hydraulic cylinder, a pneumatic cylinder, or an electric telescopic rod.

7. The explosion-proof structure of the SOFC power generation system control box according to claim 5, characterized in that, The wedge is slidably connected to the outer wall of the housing, and a slide rail is provided on the outer wall of the housing to guide and limit the wedge.

8. The explosion-proof structure of the SOFC power generation system control box according to claim 5, characterized in that, The wedge has an inclined connecting groove, and the mating component is a ball bearing that is mounted on the connecting plate and rolls in contact with the connecting groove.

9. The explosion-proof structure of the SOFC power generation system control box according to any one of claims 5-8, characterized in that, The drive mechanism also includes a spring, which is sleeved on the guide shaft and located between the sliding frame and the inner wall of the housing. The spring force biases the sliding frame toward the first position.

10. The explosion-proof structure of the SOFC power generation system control box according to claim 1, characterized in that, One of the partitions on one side is entirely or partially made of a fusible alloy plate, and when the fusible alloy plate melts, the vent is opened.

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