A single-channel rectangular narrow-slit hydraulic test body for reactor plate-type fuel assemblies

Abstract

The present invention discloses a single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly, comprising: an inlet rectangular flow channel, internally provided with a channel for water flow; an outlet rectangular flow channel, internally provided with a channel for water flow; a long narrow-slit flow channel plate and a short narrow-slit flow channel plate, the long narrow-slit flow channel plate and the short rectangular narrow-slit flow channel plate enclosing a closed rectangular narrow-slit flow channel with a narrow slit in the middle, the narrow slit in the rectangular narrow-slit flow channel connecting the inlet rectangular flow channel and the outlet rectangular flow channel at both ends; a narrow-slit adjustment gasket, located between the short narrow-slit flow channel plate and the long narrow-slit flow channel plate at their junction, and tightly fitting with the short narrow-slit flow channel plate and the long narrow-slit flow channel plate to form a closed structure; the thickness of the narrow-slit adjustment gasket is adjustable, and the width of the narrow slit in the rectangular narrow-slit flow channel can be adjusted with an accuracy of 0.01 mm. The present invention can simulate the adjustment of the width of multiple rectangular narrow slits on a set of test models, and can adjust the adjustment with high precision.

Description

Technical Field

[0001] The invention relates to the technical field of single-channel rectangular narrow slot hydraulic testing of nuclear reactor plate-type fuel assemblies, and in particular to a single-channel rectangular narrow slot hydraulic testing body of a reactor plate-type fuel assembly. Background Art

[0002] A fuel plate assembly contains multiple narrow rectangular sub-channels. The flow rate within these sub-channels is closely related to the heat-carrying capacity of the coolant within them and significantly influences the calculation of key thermal parameters. Due to errors and tolerances in fuel plate machining and assembly, these variations can affect the resistance coefficient of the rectangular slit channels, and thus the flow distribution within them. Long-term operation of the fuel plate can lead to fouling, which can also affect the sub-channel flow rate.

[0003] In order to quantitatively study the relationship between the resistance coefficient of a rectangular narrow slit channel and its width, it is necessary to obtain the difference in the resistance coefficients of sub-channels with different widths. The current practice is usually to design a separate test model for each rectangular narrow slit size, which brings great inconvenience to actual experiments. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a single-channel rectangular narrow slot hydraulic test body for reactor plate-type fuel assemblies, which can simulate multiple rectangular narrow slot widths in a set of test models, greatly reducing the test cost and cycle.

[0005] The object of the present invention is to provide a single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly, comprising:

[0006] The inlet rectangular flow channel has a channel inside for water to flow through;

[0007] The outlet rectangular flow channel has a channel inside for water to flow through;

[0008] A narrow slit flow channel long plate and a narrow slit flow channel short plate, wherein the narrow slit flow channel long plate and the rectangular narrow slit flow channel short plate enclose a closed rectangular narrow slit flow channel with a narrow slit in the middle, and the two ends of the narrow slit inside the rectangular narrow slit flow channel are connected to the internal channels of the inlet rectangular flow channel and the outlet rectangular flow channel;

[0009] The narrow slit adjustment gasket is located between the junction of the short plate of the narrow slit flow channel and the long plate of the narrow slit flow channel, and is tightly fitted with the short plate of the narrow slit flow channel and the long plate of the narrow slit flow channel to form a closed structure. The thickness of the narrow slit adjustment gasket is adjustable, and the width adjustment accuracy of the narrow slit inside the rectangular narrow slit flow channel is 0.01mm.

[0010] Optionally, both ends of the short plate of the narrow slit flow channel are embedded in the interior of the long plate of the narrow slit flow channel, and a first sealing ring is provided at the fitting surface between the short plate of the narrow slit flow channel and the long plate of the narrow slit flow channel.

[0011] Optionally, the narrow gap adjustment gasket is formed by arranging and combining a plurality of high-precision feeler gauges, and the thickness of each feeler gauge ranges from 0.02 mm to 1 mm.

[0012] Optionally, sealing gaskets are provided at the connections between the inlet rectangular flow channel, the outlet rectangular flow channel and the rectangular narrow slit flow channel to form a radial seal.

[0013] Optionally, the inlet rectangular flow channel and the outlet rectangular flow channel are both connected to the middle rectangular narrow slit flow channel through the connecting plate, and the two ends of the rectangular narrow slit flow channel are embedded in the two connecting plates. Centering adjustment gaskets are provided at the contact points between the two ends of the rectangular narrow slit flow channel and the connecting plates. The thickness of the centering adjustment gasket is adjustable, and is used to make the central axis of the internal channel of the inlet rectangular flow channel coincide with the central axis of the internal channel of the inlet rectangular flow channel and the central axis of the narrow slit, so as to center the central axis.

[0014] Optionally, the centering adjustment gasket is formed by arranging and combining a plurality of high-precision feeler gauges, and the thickness of each feeler gauge ranges from 0.02 mm to 1 mm.

[0015] Optionally, the two narrow slit flow channel long plates are fixedly connected by a bolt, nut and gasket structure.

[0016] Optionally, the two connecting plates are fixedly connected via a stud nut gasket structure.

[0017] Optionally, the inlet rectangular flow channel and the outlet rectangular flow channel are respectively provided with an inlet pressure measuring hole and an outlet pressure measuring hole for performing pressure difference measurement.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] The embodiment of the present invention provides a single-channel rectangular narrow slit hydraulic test body for a reactor plate-type fuel assembly. The body comprises an inlet rectangular flow channel, an outlet rectangular flow channel, and a rectangular narrow slit flow channel with a narrow slit formed by a long narrow slit flow channel plate and a short narrow slit flow channel plate. A narrow slit adjustment gasket is provided between the long narrow slit flow channel plate and the short narrow slit flow channel plate, thereby adjusting the width of the narrow slit. This allows for adjustment and simulation of multiple rectangular narrow slit widths on a single test model, eliminating the need to design a separate test model for each rectangular narrow slit size. This greatly facilitates the test simulation process, reduces test costs, and shortens the test cycle. Furthermore, the width adjustment accuracy of the narrow slit within the rectangular narrow slit flow channel is 0.01 mm, enabling high-precision adjustment of the narrow slit width. This overcomes the technical difficulty of high-precision adjustment of the rectangular narrow slit channel width and lays the foundation for sub-channel resistance coefficient testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0021] Figure 1 A schematic structural diagram of a single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly provided by an embodiment of the present invention;

[0022] Figure 2 For the Figure 1 Sectional view of the AA plane;

[0023] The components and corresponding marks in the figure are:

[0024] 1. Inlet rectangular flow channel, 2. Sealing gasket, 3. Centering adjustment gasket, 4. Long plate of rectangular flow channel, 5. Bolt, nut and gasket structure, 6. Stud, nut and gasket structure, 7. Outlet rectangular flow channel, 8. Narrow slit adjustment gasket, 9. Short plate of rectangular flow channel, 10. First sealing ring. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0026] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0027] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] Example 1:

[0029] like Figures 1-2 As shown, a reactor plate type fuel assembly single channel rectangular narrow slot hydraulic test body includes:

[0030] The inlet rectangular flow channel 1 has a channel for water flow to pass through, which serves as a channel for water to enter;

[0031] The outlet rectangular flow channel 7 has a channel for water flow to pass through and serves as a channel for water to flow out;

[0032] The narrow slit flow channel long plate and the narrow slit flow channel short plate are enclosed by two rectangular narrow slit flow channel short plates, forming a rectangular narrow slit flow channel with a narrow slit in the middle and a closed structure. The narrow slit is used for water circulation. The two ends of the narrow slit inside the rectangular narrow slit flow channel are respectively connected to the internal channel of the inlet rectangular flow channel 1 and the internal channel of the outlet rectangular flow channel 7; the width of the inlet rectangular flow channel 1 and the outlet rectangular flow channel 7 are both greater than the width of the narrow slit;

[0033] It also includes a narrow slit adjustment gasket 8, which is located between the junction of the narrow slit flow channel short plate and the narrow slit flow channel long plate, and is tightly fitted with the narrow slit flow channel long plate and the narrow slit flow channel short plate to form a closed structure. The thickness of the narrow slit adjustment gasket 8 is adjustable. By adjusting the thickness of the narrow slit adjustment gasket 8, the width of the narrow slit can be adjusted, so that the adjustment and simulation of the width of multiple rectangular narrow slits can be achieved on this set of test models. There is no need to design a separate test model for each rectangular narrow slit size, which greatly facilitates the test simulation process, reduces the test cost, and shortens the test cycle.

[0034] At the same time, the width adjustment accuracy of the narrow slit inside the rectangular narrow slit flow channel is 0.01 mm, so that high-precision adjustment of the narrow slit width can be achieved, overcoming the technical difficulty of high-precision adjustment of the width of the rectangular narrow slit channel and laying the foundation for the sub-channel resistance coefficient test.

[0035] This embodiment not only provides a rectangular narrow slit flow channel, but also arranges an inlet rectangular flow channel 1 and an outlet rectangular flow channel 7 on the hydraulic test body. This allows the inlet rectangular flow channel 1 and outlet rectangular flow channel 7 of the test body to be connected to the test circuit, establishing the corresponding test conditions, and conducting hydraulic test research on the rectangular narrow slit flow channel. This provides a simple structure, easy operation, and high test efficiency and precision.

[0036] Furthermore, the two ends of the narrow slit flow channel short plate are embedded in the interior of the narrow slit flow channel long plate, and two corresponding grooves are opened on the plate surface of each narrow slit flow channel long plate, which cooperate with the two end structures of the narrow slit flow channel short plate, and the narrow slit adjustment gasket 8 is between the narrow slit flow channel short plate and the grooves; during manufacturing, an assembly method is adopted, firstly, the narrow slit adjustment gasket 8 is placed at both ends of the narrow slit flow channel short plate, and then the two ends of the narrow slit flow channel short plate are respectively inserted into the corresponding grooves in the narrow slit flow channel long plate, and then the two narrow slit flow channel long plates are fixed.

[0037] An O-shaped first sealing ring 10 is provided at the fitting surface between the short plate of the narrow slit flow channel and the long plate of the narrow slit flow channel, and the axial sealing of the test body is achieved by the first sealing ring 10 .

[0038] Furthermore, the slit adjustment gasket 8 is constructed by stacking and arranging multiple high-precision feeler gauges, each with a thickness ranging from 0.02mm to 1mm. This design allows for slit width adjustment with an accuracy of 0.01mm, and eliminates the need for additional feeler gauge processing. During manufacturing, the feeler gauges are arranged in sequence according to the desired slit width and placed between the short and long slit channel plates.

[0039] Furthermore, sealing gaskets 2 are provided at the connections between the inlet rectangular flow channel 1 and the outlet rectangular flow channel 7 and the ends of the rectangular narrow slit flow channel, respectively, and the radial sealing of the test body is achieved by using the sealing gaskets 2.

[0040] Furthermore, the inlet rectangular flow channel 1 and the outlet rectangular flow channel 7 are both connected to the rectangular narrow slit flow channel located in the middle through the connecting plate. The two ends of the rectangular narrow slit flow channel are partially embedded in the two connecting plates. The contact points between the two ends of the rectangular narrow slit flow channel and the connecting plates are provided with centering adjustment gaskets 3. A centering adjustment gasket 3 is provided on both sides of each end of the rectangular narrow slit flow channel. The thickness of the centering adjustment gasket 3 is adjustable and is used to make the central axis of the internal channel of the inlet rectangular flow channel 1 coincide with the central axis of the internal channel of the inlet rectangular flow channel 1 and the central axis of the narrow slit to align the central axes. The centering adjustment gaskets 3 on both sides of each end of the rectangular narrow slit flow channel can be the same or different, thereby changing the radial position of the rectangular narrow slit flow channel so as to maintain alignment with the inlet rectangular flow channel 1 and the outlet rectangular flow channel 7. The centering adjustment gasket 3 can also be made of a high-precision feeler gauge, which is composed of a plurality of high-precision feeler gauges arranged and combined and stacked. The thickness of each feeler gauge ranges from 0.02mm to 1mm.

[0041] Furthermore, the two narrow slit flow channel long plates are fixedly connected by a bolt, nut and gasket structure 5. Figure 1As shown in the figure, multiple through-holes are provided at both ends of each narrow channel plate. Bolts, nuts, and gaskets 5 are used to achieve a detachable and fixed connection between the two symmetrical narrow channel plates. The two narrow channel plates are compressed to form a central narrow rectangular channel. The structure is simple and easy to assemble.

[0042] Furthermore, the two connecting plates can be fixedly connected by a stud nut washer structure 6. Figure 1 As shown in the figure, at least two threaded mounting holes are provided on each connecting plate, and both ends of the studs pass through the threaded mounting holes, and then gaskets and nuts are installed to complete the fastening connection assembly, and the inlet rectangular flow channel 1, the outlet rectangular flow channel 7 and the middle rectangular narrow slit flow channel are compressed.

[0043] Furthermore, the joints between the inlet rectangular flow channel 1, the outlet rectangular flow channel 7 and the connecting plate are sealed by fillet welds.

[0044] Furthermore, the inlet rectangular flow channel 1 and the outlet rectangular flow channel 7 are respectively provided with an inlet pressure measuring hole P1 and an outlet pressure measuring hole P2 for testing pressure difference measurement.

[0045] The specific adjustment and assembly process of a single-channel rectangular narrow slot hydraulic test body of a reactor plate-type fuel assembly provided by an embodiment of the present invention is as follows:

[0046] 1. Adjustment of the rectangular narrow slit width S: For example, if the size of S needs to be adjusted to 1.65mm or 1.7mm, then we can first assume that the thickness D of a narrow slit adjustment gasket 8 is to be designed. The optional range of D is 1mm to 2mm. After trial assembly of the rectangular narrow slit flow channel in the middle, the gap width S is measured. According to the measured value of S, the D value is fine-tuned until the gap width S is 1.65mm. The adjustment of the thickness D can be done only by the arrangement and combination of the feeler gauges, and the feeler gauges only need to be adjusted in the Figure 1 Arranged on two AA sections, the thickness D that finally meets the requirements is assumed to be D1; accordingly, if the gap width S needs to be adjusted to 1.7mm, then on the basis of D1, add 0.05mm of feeler gauge thickness and adjust the thickness D value to D2 = D1 + 0.05mm;

[0047] 2. To ensure that the inlet rectangular flow channel 1, the outlet rectangular flow channel 7, and the rectangular narrow slit flow channel in the middle are aligned, when the slit width S changes, the thickness G of the centering adjustment gasket 3 is also adjusted accordingly. For example, if the thickness D of the narrow slit adjustment gasket 8 increases by 0.05mm, the thickness G of the centering adjustment gasket 3 must be reduced by 0.05mm. The thickness G of the centering adjustment gasket 3 is adjusted by stacking and combining feeler gauges.

[0048] 3. The rectangular channel short plate 9 is embedded in the rectangular channel long plate 4. The single-side assembly gap is controlled at about 0.05mm. The first sealing ring 10 is arranged at the edge of the channel to minimize the remaining channels except the rectangular narrow slit channel in the middle.

[0049] 4. Design the outlet rectangular flow channel 7 and the size of the outlet rectangular flow channel 7 according to the specific requirements of the test, and arrange the pressure measuring point P1 at the inlet and the pressure measuring point P2 at the outlet. The apertures of the two pressure measuring holes are Used for differential pressure measurement on both sides of rectangular narrow slit flow channel;

[0050] 5. The height of the rectangular narrow channel is about 1m. The test body can be connected, fixed and sealed with M20 studs.

[0051] 6. After connecting the inlet and outlet pipes of the test body to the test circuit and establishing the corresponding test conditions, the hydraulic test research of the rectangular narrow slit flow channel can be carried out.

[0052] The embodiment of the present invention provides a single-channel rectangular narrow slit hydraulic test body for a reactor plate-type fuel assembly, which is provided with an inlet rectangular flow channel 1, an outlet rectangular flow channel 7, and a rectangular narrow slit flow channel with a narrow slit formed by a long narrow slit flow channel plate and a short narrow slit flow channel plate. A narrow slit adjustment gasket 8 is provided between the long narrow slit flow channel plate and the short narrow slit flow channel plate, so that the width of the narrow slit can be adjusted. The adjustment and simulation of multiple rectangular narrow slit widths can be achieved on this set of test models, eliminating the need to design a separate test model for each rectangular narrow slit size, greatly facilitating the test simulation process, reducing test costs, and shortening the test cycle. The width adjustment accuracy of the narrow slit inside the rectangular narrow slit flow channel is 0.01mm, which can achieve high-precision adjustment of the narrow slit width, overcoming the technical difficulty of high-precision adjustment of the rectangular narrow slit channel width and laying the foundation for sub-channel resistance coefficient testing.

[0053] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly, characterized in that: include: An inlet rectangular flow channel (1) is provided with a channel for water flow to pass through; An outlet rectangular flow channel (7) having a channel therein for water to flow through; A narrow slit flow channel long plate and a narrow slit flow channel short plate, wherein the narrow slit flow channel long plate and the rectangular narrow slit flow channel short plate enclose a closed rectangular narrow slit flow channel having a narrow slit in the middle, wherein both ends of the narrow slit inside the rectangular narrow slit flow channel are connected to the internal channels of the inlet rectangular flow channel (1) and the outlet rectangular flow channel (7); The narrow slit adjustment gasket (8) is located between the junction of the narrow slit flow channel short plate and the narrow slit flow channel long plate, and is tightly fitted with the narrow slit flow channel short plate and the narrow slit flow channel long plate to form a closed structure. The thickness of the narrow slit adjustment gasket (8) is adjustable, and the width adjustment accuracy of the narrow slit inside the rectangular narrow slit flow channel is 0.01 mm. The inlet rectangular flow channel (1) and the outlet rectangular flow channel (7) are both connected to the rectangular narrow slit flow channel in the middle through the connecting plate. The two ends of the rectangular narrow slit flow channel are embedded in the two connecting plates. Centering adjustment gaskets (3) are provided at the contact points between the two ends of the rectangular narrow slit flow channel and the connecting plates. The thickness of the centering adjustment gasket (3) is adjustable and is used to make the central axis of the internal channel of the inlet rectangular flow channel (1) coincide with the central axis of the internal channel of the inlet rectangular flow channel (1) and the central axis of the narrow slit, so as to perform centering of the central axis.

2. A reactor plate type fuel assembly single channel rectangular narrow slit hydraulic test body according to claim 1, characterized in that: Both ends of the narrow slit flow channel short plate are embedded in the interior of the narrow slit flow channel long plate, and a first sealing ring (10) is provided at the fitting surface between the narrow slit flow channel short plate and the narrow slit flow channel long plate.

3. A reactor plate type fuel assembly single channel rectangular narrow slit hydraulic test body according to claim 1, characterized in that: The narrow gap adjustment gasket (8) is formed by arranging and combining a plurality of high-precision feeler gauges, and the thickness of each feeler gauge ranges from 0.02 mm to 1 mm.

4. A single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly according to claim 3, characterized in that: Sealing gaskets (2) are provided at the connections between the inlet rectangular flow channel (1) and the outlet rectangular flow channel (7) and the rectangular narrow slit flow channel to form a radial seal.

5. The reactor plate type fuel assembly single channel rectangular narrow slot hydraulic test body according to claim 1, characterized in that: The centering adjustment gasket (3) is formed by arranging and combining a plurality of high-precision feeler gauges, and the thickness of each feeler gauge ranges from 0.02 mm to 1 mm.

6. A single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly according to claim 5, characterized in that: The two narrow slit flow channel long plates are fixedly connected via a bolt, nut, and gasket structure (5).

7. A single-channel rectangular narrow-slit hydraulic test body for a reactor plate-type fuel assembly according to claim 6, characterized in that: The two connecting plates are fixedly connected via a double-headed stud nut gasket structure (6).

8. The reactor plate type fuel assembly single channel rectangular narrow slot hydraulic test body according to claim 7, characterized in that: The inlet rectangular flow channel (1) and the outlet rectangular flow channel (7) are respectively provided with an inlet pressure measuring hole and an outlet pressure measuring hole for performing pressure difference measurement.

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