CN111968763B - Friction type control rod driving mechanism and method - Google Patents
Friction type control rod driving mechanism and method Download PDFInfo
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- CN111968763B CN111968763B CN202011009646.8A CN202011009646A CN111968763B CN 111968763 B CN111968763 B CN 111968763B CN 202011009646 A CN202011009646 A CN 202011009646A CN 111968763 B CN111968763 B CN 111968763B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
- G21C7/14—Mechanical drive arrangements
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention provides a friction type control rod driving mechanism and a method, and relates to the technical field of nuclear power equipment. Compared with the prior art, the friction type control rod driving mechanism provided by the invention is driven by the driving assembly in rolling connection, and the driving assembly can be separated from the control rod when the power is off, and the control is realized without additionally arranging structures such as complex clamping hook clamping teeth and the like, so that the structure is simple, safe and reliable.
Description
Technical Field
The invention relates to the technical field of nuclear power equipment, in particular to a friction type control rod driving mechanism and a method.
Background
In a nuclear reactor, a nuclear reaction needs to be controlled by a movable nuclear power control rod, the nuclear power control rod is generally made of materials which are easy to absorb neutrons, such as boron, cadmium and the like, a set of driving mechanism needs to be additionally arranged inside or outside a nuclear reaction pressure vessel to operate the control rod, and the control rod has the following control conditions: the nuclear reaction rate is too fast, the control rod is driven by the driving mechanism to move downwards, the surface area of the control rod inserted into the fuel assembly downwards is increased, the contact of nuclear fuel is blocked, and the reaction rate is reduced; the nuclear reaction rate is too slow, the control rods are driven by the driving mechanism to move upwards, the control rods are lifted upwards, the mutual contact area of the fuel assemblies is increased, and the reaction rate is improved; the nuclear reaction rate is normal, the relative position of the driving mechanism is kept unchanged, the control rods are also kept at a fixed position, the mutual contact area of the fuel assemblies is not increased or reduced, and the nuclear reaction rate is kept unchanged; if an emergency and an irresistance factor are happened, all electric control equipment of the reactor fails. In this case, the drive mechanism must drive the control rods immediately downward to fully insert the fuel assemblies, completely blocking the fuel assemblies from contacting each other, and stopping the entire nuclear reaction. The four exercise situations are summarized as follows: the driving mechanism drives the control rod to carry out 1-lifting; 2. descending; 3. maintaining; 4. free fall.
In the prior art, in order to operate the control rod under normal conditions and enable the control rod to be inserted into the fuel assembly completely and immediately downwards in the event of failure of an electric control device, a complicated mechanical structure is usually adopted to realize control of the control rod, for example, the control and unhooking are realized through a complicated structure such as a hook latch, and the like, and the control mode has a complicated structure and low reliability.
In view of this, it is important to design and manufacture a friction type control rod driving mechanism with simple structure, safety and reliability.
Disclosure of Invention
The invention aims to provide a friction type control rod driving mechanism which is simple in structure, safe and reliable.
Another object of the present invention is to provide a friction type control rod driving method which is highly safe by performing control by a driving mechanism having a simple structure.
The invention is realized by adopting the following technical scheme.
In one aspect, the invention provides a friction type control rod driving mechanism, which includes a housing, a driving rod, a first magnetic attraction piece, a second magnetic attraction piece and a driving assembly, wherein the first magnetic attraction piece is disposed in the housing, the second magnetic attraction piece is movably disposed in the housing and is opposite to the first magnetic attraction piece, at least one of the first magnetic attraction piece and the second magnetic attraction piece is an electromagnet and is away from each other when power is off, the driving rod is disposed on the second magnetic attraction piece in a penetrating manner, and the driving assembly is disposed between the driving rod and the second magnetic attraction piece and is in rolling connection with the driving rod, and is configured to drive the driving rod to move relative to the first magnetic attraction piece and is away from the driving rod when the first magnetic attraction piece and the second magnetic attraction piece are away from each other.
Furthermore, the driving assembly comprises a first driving piece and a second driving piece, wherein the first driving piece and the second driving piece are arranged on two sides of the driving rod relatively, and are respectively in rolling connection with two sides of the driving rod and used for driving the driving rod to move.
Furthermore, the driving assembly further comprises an elastic member, and the elastic member is respectively abutted against the first driving member and the second driving member and used for pushing the first driving member and the second driving member to move back and forth and to be separated from the driving rod.
Furthermore, the first driving part comprises two first friction bases and first friction driving wheels, the two first friction bases are oppositely arranged on one side of the driving rod and are abutted against the inner side of the second magnetic suction part, and the first friction driving wheels are rotatably arranged between the two first friction driving wheels and are in rolling connection with the driving rod; the second driving piece comprises two second friction bases and two second friction driving wheels, the two second friction bases are arranged on the other side of the driving rod relatively and are abutted to the inner side of the second magnetic suction piece, and the second friction driving wheels are rotatably arranged between the two second friction bases and are in rolling connection with the driving rod.
Furthermore, the peripheral surfaces of the first friction driving wheel and the second friction driving wheel are provided with abdicating grooves used for being attached to the surface of the driving rod.
Furthermore, a first abutting block and a second abutting block are arranged on the inner side of the second magnetic attraction piece, the first abutting block and the second abutting block are respectively located on two sides of the driving rod, the first abutting block abuts against the two first friction bases, and the second abutting block abuts against the two second friction bases.
Furthermore, a supporting channel for accommodating the first friction base and the second friction base is formed between the first supporting block and the second supporting block, and the width of the supporting channel close to the first magnetic attraction piece is larger than the width of the supporting channel far away from the first magnetic attraction piece.
Furthermore, the first abutting block and the second abutting block are provided with anti-falling inclined planes, the first friction base and the second friction base are wedge-shaped and provided with abutting inclined planes, and the anti-falling inclined planes are attached to the abutting inclined planes.
Further, the shell is cylindricly, first magnetism inhale the piece with the piece is also cylindricly inhaled to the second magnetism, just first magnetism inhale a interference fit and be in the inside of shell, the external diameter of piece is inhaled to the second magnetism is less than the internal diameter of shell.
In another aspect, the present invention provides a friction type control rod driving method, which is suitable for the friction type control rod driving mechanism, and includes the following steps:
when the power is on, the driving component controls the driving rod to ascend, descend or keep still;
when the power is cut off, the driving component is separated from the driving rod.
The invention has the following beneficial effects:
the invention provides a friction type control rod driving mechanism, wherein a first magnetic part is arranged in a shell, a second magnetic part is movably arranged in the shell, a driving component is arranged between a driving rod and the second magnetic part, the driving rod is driven by the driving component to move up and down under the power-on condition so as to drive a control rod to move, under the power-off condition, the first magnetic part and the second magnetic part are far away from each other, the driving component is separated from the driving rod, the driving rod loses support and freely falls under the gravity action, so that the control rod can be immediately inserted into a fuel component, the mutual contact of the fuel components is completely cut off, and the whole nuclear reaction is stopped. Compared with the prior art, the friction type control rod driving mechanism provided by the invention is driven by the driving assembly in rolling connection, and the driving assembly can be separated from the control rod when the power is off, and the control is realized without additionally arranging structures such as complex clamping hook clamping teeth and the like, so that the structure is simple, safe and reliable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the overall structure of a friction type CRDM provided in a first embodiment of the present invention at a first viewing angle;
FIG. 2 is a cross-sectional view of the friction type CRDM at a second viewing angle in accordance with the first embodiment of the present invention;
FIG. 3 is a cross-sectional view of the friction type CRDM at a third viewing angle in accordance with the first embodiment of the present invention;
FIG. 4 is a schematic illustration of the internal structure of a friction type CRDM according to a first embodiment of the present invention at a first viewing angle;
FIG. 5 is a schematic illustration of a portion of a friction type CRDM provided in accordance with a first embodiment of the invention;
FIG. 6 is a schematic diagram of the internal structure of the friction type CRDM according to the first embodiment of the present invention at a second viewing angle.
Icon: 100-friction control rod drive mechanism; 110-a housing; 111-a load-bearing base; 113-a bearing projection; 130-a drive rod; 150-a first magnetic attachment; 151-guide groove; 170-a second magnetic attachment; 171-a first holding block; 173-second holding block; 190-a drive assembly; 191 — a first driving member; 1911-a first friction mount; 1913-a first friction drive wheel; 193-a second drive member; 1931-a second friction mount; 1933 — a second friction drive wheel; 195-an elastic member; 197-a yielding slot; 199-guide ribs.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships conventionally put on the products of the present invention when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As disclosed in the background, the conventional friction type crdm generally employs a complicated mechanical structure for operating the crdm, which undoubtedly means a great reduction in reliability and stability, and even a case of failure of the mechanism due to seizure may occur, which is difficult to measure in the reactor. The control rod is operated in a simple form of combining the magnetic part and the driving part, and the driving assembly can directly remove the operation effect of the control rod when power is cut off accidentally, so that the control rod can be in a free-falling state and can be immediately inserted into the fuel assembly under the action of gravity, the mutual contact of the fuel assembly is blocked, and the safety of a reactor is ensured.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.
First embodiment
Referring to fig. 1 and 2 in combination, the present embodiment provides a friction type control rod drive mechanism 100 that enables linear and continuous control of control rods, is simple in structure, does not require the use of a complicated hook latch structure, and is safe and reliable in that control rods can be inserted into a fuel assembly immediately after power is cut off.
The friction type control rod driving mechanism 100 provided by this embodiment includes a housing 110, a driving rod 130, a first magnetic attraction piece 150, a second magnetic attraction piece 170 and a driving assembly 190, the first magnetic attraction piece 150 is disposed in the housing 110, the second magnetic attraction piece 170 is movably disposed in the housing 110 and is disposed opposite to the first magnetic attraction piece 150, at least one of the first magnetic attraction piece 150 and the second magnetic attraction piece 170 is an electromagnet and is away from each other when the power is off, the driving rod 130 is disposed on the second magnetic attraction piece 170 in a penetrating manner, the driving assembly 190 is disposed between the driving rod 130 and the second magnetic attraction piece 170 and is connected to the driving rod 130 in a rolling manner, so as to drive the driving rod 130 to move relative to the first magnetic attraction piece 150, and to be separated from the driving rod 130 when the first magnetic attraction piece 150 and the second magnetic attraction piece 170 are away.
It should be noted that, in this embodiment, the driving rod 130 is disposed along the vertical direction for connecting to the control rod, and the driving rod 130 and the control rod are disposed along the same direction, and the second magnetic attraction piece 170 falls downward under the action of gravity when the power is off, and the driving assembly 190 releases the rolling connection to the driving rod 130, so that the driving rod 130 is in a free state, and falls downward under the action of gravity and falls downward together with the control rod.
In this embodiment, the first magnetic attraction member 150 is an electromagnet, the second magnetic attraction member 170 is a permanent magnet, the first magnetic attraction member 150 is fixedly disposed on the inner wall of the housing 110, the second magnetic attraction member 170 is movably disposed in the housing 110, a coil is disposed outside the first magnetic attraction member 150 and electrically connected to an external power source or a power grid, when the power is turned on, the first magnetic attraction member 150 has magnetism and is attracted to the second magnetic attraction member 170, so that the first magnetic attraction member 150 and the second magnetic attraction member 170 are relatively fixed to each other, when the power is turned off, the first magnetic attraction member 150 loses magnetism and releases magnetic attraction with the second magnetic attraction member 170, so that the second magnetic attraction member 170 falls downward under the action of gravity, so that the driving assembly 190 loses the supporting action of the second magnetic attraction member 170, and the driving assembly 190 loses rolling connection with the driving rod 130.
In other preferred embodiments of the present invention, the first magnetic element 150 is a permanent magnet, the second magnetic element 170 is an electromagnet, and a coil is disposed outside the second magnetic element 170. Of course, the first magnetic attraction piece 150 and the second magnetic attraction piece 170 may be electromagnets, and they can be attracted to each other when they are powered on, and they are away from each other when they are powered off.
In this embodiment, the housing 110 is cylindrical, the first magnetic attraction piece 150 and the second magnetic attraction piece 170 are also cylindrical, the first magnetic attraction piece 150 is in interference fit with the inside of the housing 110, and the outer diameter of the second magnetic attraction piece 170 is smaller than the inner diameter of the housing 110, so that the second magnetic attraction piece 170 can be movably disposed in the housing 110. In other preferred embodiments of the present invention, the first magnetic element 150 can be fixed on the inner side of the outer shell 110 by bolts or fixed on the outer shell 110 by flanges, but any connection method that can ensure the first magnetic element 150 to be fixed on the outer shell 110 during operation is within the scope of the present invention.
Referring to fig. 3 to 6 in combination, the driving assembly 190 includes a first driving member 191, a second driving member 193, and an elastic member 195, wherein the first driving member 191 and the second driving member 193 are oppositely disposed at two sides of the driving rod 130 and are respectively connected with two sides of the driving rod 130 in a rolling manner, for driving the driving rod 130 to move. The elastic member 195 abuts against the first driving member 191 and the second driving member 193 respectively, and is used for pushing the first driving member 191 and the second driving member 193 to move back and forth and to be disengaged from the driving rod 130. And the second magnetic attraction piece 170 is abutted against the first driving piece 191 and the second driving piece 193.
In this embodiment, the elastic member 195 is a compression spring, the compression spring is pressed between the first driving member 191 and the second driving member 193, in the power-on state, due to the abutting action of the second magnetic attraction member 170, the first driving member 191 and the second driving member 193 are in the state of being close to each other, at this time, the compression spring is compressed and stores elastic potential energy, after the power-off state, the second magnetic attraction member 170 releases the abutting action on the first driving member 191 and the second driving member 193, and under the elastic force action of the compression spring, the first driving member 191 and the second driving member 193 move back and forth and are separated from the driving rod 130, so as to release the rolling connection action on the driving rod 130, and the driving rod 130 is in the free-falling state.
The first driving member 191 includes two first friction bases 1911 and a first friction driving wheel 1913, the two first friction bases 1911 are oppositely disposed on one side of the driving rod 130 and are both abutted against the inner side of the second magnetic attraction member, and the first friction driving wheel 1913 is rotatably disposed between the two first friction driving wheels 1913 and is in rolling connection with the driving rod; the second driving member 193 includes two second friction bases 1931 and second friction drive wheel 1933, and two second friction bases 1931 set up the opposite side at the actuating lever 130 relatively and all inhale the inboard counterbalance of piece with the second magnetism, and second friction drive wheel 1933 rotates and sets up between two second friction bases 1931 and with the actuating lever roll connection. Specifically, two first friction bases 1911 and two second friction bases 1931 correspond to each other one by one, at least one elastic member 195 is disposed between the first friction base 1911 and the corresponding second friction base 1931, preferably, two elastic members 195 are disposed between the first friction base 1911 and the corresponding second friction base 1931, and the first friction base 1911 and the second friction base 1931 are pushed away from each other by the two elastic members 195, so that the first friction driving wheel 1913 and the second friction driving wheel 1933 are disengaged from the driving rod 130.
In this embodiment, two first friction bases 1911 are disposed in parallel, a rotating shaft is disposed on the first friction driving wheel 1913, and two ends of the rotating shaft on the first friction driving wheel 1913 respectively extend into the two first friction bases 1911, so as to realize a rotational connection with the first friction bases 1911. Specifically, bearings are respectively disposed at two ends of the rotating shaft, and are embedded in the first friction base 1911 through the bearings, so that the first friction driving wheel 1913 is rotatably connected with the first friction base 1911. Two second friction bases 1931 set up in parallel, and also be provided with the pivot on the second friction drive wheel 1933, and the both ends of the pivot on the second friction drive wheel 1933 stretch into two second friction bases 1931 respectively to the realization is connected with the rotation of second friction base 1931. Specifically, the two ends of this pivot are provided with the bearing respectively, inlay through the bearing and establish in second friction base 1931 to realize rotating the connection.
It should be noted that the two rotating shafts respectively extend out towards two opposite directions, so as to be conveniently connected with an external motor.
In this embodiment, the first friction driving wheel 1913 and the second friction driving wheel 1933 are both connected to a motor (not shown) disposed in the housing 110, and the first friction driving wheel 1913 and the second friction driving wheel 1933 can be synchronously controlled to rotate by the motor, and the rotation directions of the first friction driving wheel 1913 and the second friction driving wheel 1933 are opposite, so that the first friction driving wheel 1913 and the second friction driving wheel 1933 can synchronously lift the driving rod 130 or fall the driving rod 130. The driving rod 130 is driven by the friction driving wheel, so that the displacement of the driving rod 130 is smoother, the driving rod 130 is controlled to move continuously and linearly, and the control precision of the driving rod 130 is improved. Of course, in other preferred embodiments, the first and second friction drive wheels 1913, 1933 may be self-driven, driven by an internal self-contained motor, and not overly described herein.
In this embodiment, the outer peripheral surfaces of the first friction driving wheel 1913 and the second friction driving wheel 1933 are both provided with a relief groove 197 for fitting to the surface of the driving rod 130. Specifically, the actuating lever 130 is cylindricly, and the groove 197 of stepping down is the arc, and its shape matches with the shape of actuating lever 130 for the surface of actuating lever 130 can laminate with the groove 197 of stepping down, has increased the area of contact between first friction drive wheel 1913, second friction drive wheel 1933 and the actuating lever 130, has guaranteed the drive effect.
In this embodiment, a guide groove 151 has been seted up to the bottom of first magnetism piece 150, and the top of first friction base 1911 and second friction base 1931 all is provided with direction sand grip 199, and the cooperation of direction sand grip 199 sets up in guide groove 151 to can play the guide effect when first friction base 1911 and second friction base 1931 radially outwards move.
In this embodiment, a bearing base 111 is further disposed below the second magnetic attraction piece 170, the bearing base 111 has a bearing protrusion 113, the size of the bearing protrusion 113 is smaller than the inner diameter of the second magnetic attraction piece 170, and the second magnetic attraction piece 170 does not fall on the bearing base 111, the bearing protrusion 113 is disposed at the bottom of the first friction base 1911 and the second friction base 1931, so as to prevent the first friction base 1911 and the second friction base 1931 from falling downward.
The inner side of the second magnetic attraction piece 170 is provided with a first abutting block 171 and a second abutting block 173, the first abutting block 171 and the second abutting block 173 are respectively located at two sides of the driving rod 130, the first abutting block 171 abuts against the two first friction bases 1911, and the second abutting block 173 abuts against the two second friction bases 1931. By providing the first abutting block 171 and the second abutting block 173, the first friction base 1911 and the second friction base 1931 are abutted respectively, so that the driving assembly 190 is fixed from both sides, and the positions of the sub-components of the driving assembly 190 can be further ensured to be in a relatively fixed state under the power-on condition.
In this embodiment, a supporting channel for accommodating the first friction base 1911 and the second friction base 1931 is formed between the first supporting block 171 and the second supporting block 173, and the width of the supporting channel close to the first magnetic attraction is smaller than the width of the supporting channel far from the first magnetic attraction. Specifically, the first abutting block 171 and the second abutting block 173 both have an anti-disengaging inclined surface, the first friction base 1911 and the second friction base 1931 both have a wedge shape and an abutting inclined surface, and the anti-disengaging inclined surface and the abutting inclined surface are attached to each other. Through setting up two inclined planes and laminating each other for two inclined planes can the relative slip when the second magnetism piece 170 falls, avoid keeping away from each other and cause the obstacle first friction base 1911 and second friction base 1931.
It is worth noting that the inclined plane direction of the anti-disengaging inclined plane all faces upwards in this embodiment, so that the first friction base 1911 and the second friction base 1931 can bear on the two anti-disengaging inclined planes, and the anti-disengaging inclined plane plays a bearing role at this time. When the power is off, the second magnetic attraction piece 170 falls down, so that the anti-disengagement slope can disengage from the first friction base 1911 and the second friction base 1931, and the first friction base 1911 and the second friction base 1931 are away from each other under the action of the elastic piece 195.
In other preferred embodiments of the present invention, the first friction base 1911 and the second friction base 1931 may also be in a saw-toothed shape, and the abutting surfaces of the first abutting block 171 and the second abutting block 173 are adapted to be in a saw-toothed shape and are disposed in an inclined manner, which can also limit the first friction base 1911 and the second friction base 1931 when the power is turned on, and release the limit of the first friction base 1911 and the second friction base 1931 when the power is turned off.
The friction type control rod drive mechanism 100 provided in this embodiment has the following working process:
when in work:
lifting the external coil of the first magnetic attraction piece 150 and electrifying the external coil to enable the first magnetic attraction piece 150 to be magnetized; the magnetic force of the first magnetic element 150 drives the second magnetic element 170 to move upwards until the two elements keep the relative position unchanged after contacting;
in the process of upward movement of the second magnetic attraction piece 170, the anti-disengagement inclined surfaces of the wedge structures on the first abutting block 171 and the second abutting block 173 and the abutting inclined surfaces of the first friction base 1911 and the second friction base 1931 are squeezed with each other, so as to drive the first friction base 1911 and the second friction base 1931 to move toward the axial lead along the radial direction, that is, to move in opposite directions; the first friction base 1911 and the second friction base 1931 compress the compression spring arranged between the two in the process of the centering motion, so that the spring stores elastic potential energy;
the first friction base 1911 and the second friction base 1931 drive the first friction wheel and the second friction wheel to move toward the center, so that the first friction wheel and the second friction wheel are in close contact with the driving rod 130; and when the power is turned on, the relative positions of the first magnetic attraction member 150 and the second magnetic attraction member 170 are fixed, and finally the relative positions of the sub-components of the driving assembly 190 are fixed.
The forward/reverse/stall of the first and second friction wheels is controlled by the forward/reverse/stall of the external motor, and the driving rod 130 is further controlled to drive the control rod to move up/down/hold, three movements.
In special cases: when the power is off, the second magnetic attraction piece 170 is powered off and loses magnetic force; the second magnetic attraction piece 170 descends under the action of gravity, and the first abutting block 171 and the second abutting block 173 on the inner side of the second magnetic attraction piece 170 are separated from the first friction base 1911 and the second friction base 1931 respectively; the intermediate compression spring releases the stored elastic potential energy, pushing first friction mount 1911 and second friction mount 1931 to move in a radially outward direction; the first friction wheel and the second friction wheel are driven to be separated from the driving rod 130, and finally the control rod is allowed to freely fall and is completely inserted into the fuel assembly at the bottom of the reactor, so that the nuclear reaction is stopped.
In summary, in the friction-type crdm 100 provided in this embodiment, under the power-on condition, the first abutting block 171 and the second abutting block 173 inside the second magnetic attraction piece 170 abut against the first friction base 1911 and the second friction base 1931 respectively, so that the driving assembly 190 is in the fixed state, the first friction wheel and the second friction wheel abut against the driving rod 130, and the driving rod 130 is driven by the first friction wheel and the second friction wheel to ascend, descend or stop; when the power failure is caused by an unexpected accident, the second magnetic attraction piece 170 is separated from the first magnetic attraction piece 150, the second magnetic attraction piece 170 falls under the action of gravity, so that the first abutting block 171 and the second abutting block 173 are separated from the first friction base 1911 and the second friction base 1931, under the action of the elastic force of the compression spring, the first friction base 1911 and the second friction base 1931 are separated from each other, the first friction wheel and the second friction wheel are separated from the driving rod 130, and the driving rod 130 falls downwards under the action of gravity, so that the control rod can be inserted into the fuel assembly. Compared with the prior art, the friction type control rod driving mechanism 100 provided by the embodiment has a simple structure, is safe and reliable, and simultaneously drives the driving rod 130 through the friction wheel, so that the driving rod 130 can be continuously controlled, the displacement of the driving rod 130 is linear, and the control precision is high.
Second embodiment
The embodiment provides a friction type control rod driving method, which is suitable for a friction type control rod driving mechanism 100 and comprises the following steps:
s1: when energized, the drive rod 130 is controlled by the drive assembly 190 to rise, fall, or remain stationary.
Specifically, the first friction driving wheel 1913 and the second friction driving wheel 1933 are driven to rotate in the forward direction, the reverse direction, and the stop direction by the external motor, so as to drive the driving rod 130 to ascend/descend/remain stationary, thereby satisfying the working requirement.
S2: when de-energized, the drive assembly 190 disengages the drive rod 130.
Specifically, under the extreme condition of power failure of any electronic control device, the first magnetic attraction piece 150 loses magnetic force, the second magnetic attraction piece 170 moves downwards for a certain distance, the wedge-shaped surface between the first friction base 1911 and the first abutting block 171 and the wedge-shaped surface between the second friction base 1931 and the second abutting block 173 are separated, the compression spring releases elastic potential energy to push the first friction base 1911 and the second friction base 1931 to move outwards along the radial direction, so that the first friction driving wheel 1913 and the second friction driving wheel 1933 are separated from the driving rod 130, the driving rod 130 is in free-falling motion under the action of gravity to drive the control rod to fall into the bottom fuel assembly completely, and the nuclear reaction can be stopped.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a friction formula control rod actuating mechanism, its characterized in that inhales piece, second magnetism and drive assembly including shell, actuating lever, first magnetism is inhaled the piece and is set up in the shell, the second magnetism is inhaled the piece activity and is set up in the shell and with first magnetism is inhaled the relative setting of piece, first magnetism inhale the piece with the piece is inhaled to the second magnetism at least one is the electro-magnet to keep away from each other when the outage, the actuating lever is worn to establish on the piece is inhaled to the second magnetism, drive assembly supports and holds on the piece is inhaled to the second magnetism, and with actuating lever roll connection is used for the drive the actuating lever for the piece motion is inhaled to first magnetism, and first magnetism inhale the piece with the second magnetism is inhaled and breaks away from when keeping away from each other the actuating lever.
2. The friction-type crdm as set forth in claim 1, wherein the drive assembly comprises a first driver and a second driver, the first driver and the second driver are oppositely disposed at two sides of the driving rod and are respectively in rolling connection with the two sides of the driving rod for driving the driving rod to move.
3. The friction crdm as set forth in claim 2, wherein the drive assembly further comprises a resilient member abutting the first driver and the second driver, respectively, for urging the first driver and the second driver to move back and forth and away from the drive rod.
4. The friction type crdm as set forth in claim 2 or 3, wherein the first driving member comprises two first friction bases and first friction driving wheels, the two first friction bases are oppositely disposed at one side of the driving rod and are respectively abutted against the inner side of the second magnetic attraction member, and the first friction driving wheels are rotatably disposed between the two first friction driving wheels and are in rolling connection with the driving rod; the second driving piece comprises two second friction bases and two second friction driving wheels, the two second friction bases are arranged on the other side of the driving rod relatively and are abutted to the inner side of the second magnetic suction piece, and the second friction driving wheels are rotatably arranged between the two second friction bases and are in rolling connection with the driving rod.
5. The friction type crdm as set forth in claim 4, wherein the first friction driving wheel and the second friction driving wheel are provided with a relief groove on the outer peripheral surface thereof for fitting the surface of the driving rod.
6. The friction-type crdm as set forth in claim 4, wherein a first abutting block and a second abutting block are disposed inside the second magnetic attraction member, the first abutting block and the second abutting block are respectively disposed at two sides of the driving rod, the first abutting block abuts against the two first friction bases, and the second abutting block abuts against the two second friction bases.
7. The friction-type crdm as set forth in claim 6, wherein a supporting channel for accommodating the first friction base and the second friction base is formed between the first supporting block and the second supporting block, and a width of the supporting channel near the first magnetic attraction is greater than a width of the supporting channel away from the first magnetic attraction.
8. The friction-type crdm as set forth in claim 7, wherein the first and second supporting blocks each have an anti-drop slope, the first and second friction bases each have a wedge shape and have a supporting slope, and the anti-drop slope and the supporting slope are attached to each other.
9. The friction type crdm as set forth in claim 1, wherein the housing is cylindrical, the first and second magnetically attractive elements are cylindrical, the first magnetically attractive element is interference fit within the housing, and the second magnetically attractive element has an outer diameter smaller than an inner diameter of the housing.
10. A friction type crdm driving method applied to the friction type crdm as set forth in claim 1, comprising the steps of:
when the power is on, the driving component controls the driving rod to ascend, descend or keep still;
when the power is cut off, the driving component is separated from the driving rod.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019111794267 | 2019-11-27 | ||
| CN201911179426 | 2019-11-27 |
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| CN111968763A CN111968763A (en) | 2020-11-20 |
| CN111968763B true CN111968763B (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011009646.8A Active CN111968763B (en) | 2019-11-27 | 2020-09-23 | Friction type control rod driving mechanism and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5133293A (en) * | 1974-09-13 | 1976-03-22 | Hitachi Ltd | |
| US4060452A (en) * | 1975-12-11 | 1977-11-29 | Kraftwerk Union Aktiengesellschaft | Positioning drive for absorber rods of a nuclear reactor |
| CN1041664A (en) * | 1988-10-04 | 1990-04-25 | 法玛通公司 | Nuclear reactor plate and cluster guide flange in and fixed mechanism |
| CN1258916A (en) * | 1998-12-29 | 2000-07-05 | 东芝株式会社 | Control rod driving mechanism |
| CN106409347A (en) * | 2016-10-31 | 2017-02-15 | 中国核动力研究设计院 | Friction locking type magnetic lifter and control method thereof |
-
2020
- 2020-09-23 CN CN202011009646.8A patent/CN111968763B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5133293A (en) * | 1974-09-13 | 1976-03-22 | Hitachi Ltd | |
| US4060452A (en) * | 1975-12-11 | 1977-11-29 | Kraftwerk Union Aktiengesellschaft | Positioning drive for absorber rods of a nuclear reactor |
| CN1041664A (en) * | 1988-10-04 | 1990-04-25 | 法玛通公司 | Nuclear reactor plate and cluster guide flange in and fixed mechanism |
| CN1258916A (en) * | 1998-12-29 | 2000-07-05 | 东芝株式会社 | Control rod driving mechanism |
| CN106409347A (en) * | 2016-10-31 | 2017-02-15 | 中国核动力研究设计院 | Friction locking type magnetic lifter and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN111968763A (en) | 2020-11-20 |
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