CN114658786A - Large hydraulic damper for nuclear power station - Google Patents
Large hydraulic damper for nuclear power station Download PDFInfo
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- CN114658786A CN114658786A CN202210285902.9A CN202210285902A CN114658786A CN 114658786 A CN114658786 A CN 114658786A CN 202210285902 A CN202210285902 A CN 202210285902A CN 114658786 A CN114658786 A CN 114658786A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
Abstract
The invention discloses a large hydraulic damper for a nuclear power station, which comprises a pull ring, a piston cylinder with two oil cavities, two damping valves and an oil pipe for communicating the two damping valves, wherein the end part of one end of a cylinder body of the piston cylinder extends outwards to form a ring buckle, and the other end of the cylinder body is sealed by a cylinder cover of the oil cylinder; one end of a piston rod of the piston cylinder extends out of the cylinder cover and is connected with a pull ring, the outside of the pull ring is connected with a load, the two damping valves are defined as a first damping valve and a second damping valve and are respectively arranged on the cylinder cover and the cylinder body, the first damping valve is communicated with a first oil cavity through a cylinder cover oil way arranged on the cylinder cover, and the second damping valve is communicated with a second oil cavity through a cylinder body oil way arranged on the cylinder body. The advantages are that: the large hydraulic damper for the nuclear power station adjusts the locking speed of the damper by adjusting the compression amount of a damping valve spring.
Description
Technical Field
The invention relates to a large hydraulic damper for a nuclear power station.
Background
The main equipment of the pressurized water reactor nuclear power plant comprises a pressure vessel, a reactor coolant pump, a main pipeline, a steam generator, a pressure stabilizer, other special safety equipment and the like.
When the nuclear power plant normally operates, the nuclear power plant has operating states of cold state, hot state, full power, non-full power and the like, and the temperature of a pipeline connected with equipment changes along with the operating condition of the power plant, which causes thermal expansion and cold contraction of the pipeline. When an earthquake occurs, the impact generated by the earthquake causes the equipment on the support to generate an acceleration of 0.5g-15 g.
If the equipment is rigidly connected, the deformation caused by expansion with heat and contraction with cold cannot be applied; if a flexible connection is used, it is not possible to limit the movement of the device when subjected to sudden loads (such as earthquakes and alternating or continuous loads), and thus to avoid breakage or breakage of the pipes connecting the device, with the occurrence of nuclear leaks.
The damper is one of important safety protection devices of mechanical equipment in a nuclear power plant. In normal operation, the damper valve of the damper is in an open state, and is self-adaptive to slow movement caused by normal thermal expansion. When the damper bears sudden loading, the damper can be self-locked, and the damper is approximately rigid at the moment, so that the movement of equipment and a pipeline can be limited, and further the protection effect is achieved. At present, the hydraulic damper is widely applied to a nuclear power plant.
The common hydraulic damper for nuclear power adopts a structural form of a single-piston-rod hydraulic cylinder, the hydraulic cylinder is only provided with a piston rod on one side of a piston, and effective action areas on two sides of the piston are unequal. The larger the diameter of the piston rod is, the larger the difference of effective action areas on two sides of the piston is; under the action of loads with the same magnitude, the pressure borne by hydraulic oil on two sides of the piston has larger difference, and the axial deformation difference is also large, so that the axial rigidity difference of the damper is larger. In addition, after the conventional nuclear power damper is manufactured, the locking speed (the movement speed of the piston when the locking is triggered) of the conventional nuclear power damper is fixed, and the conventional nuclear power damper cannot be adjusted, so that the personalized requirements of users cannot be met.
Disclosure of Invention
The invention provides a large hydraulic damper for a nuclear power station, which adopts a mode of an equal-diameter double-piston-rod hydraulic cylinder to ensure that the cross sections of hydraulic oil on two sides of a piston are the same, thereby ensuring the consistency of axial rigidity; the adjustable damping valve is adopted, so that the locking speed of the damper can be adjusted, and different requirements of users are met. The specific technical scheme is as follows:
a large hydraulic damper for a nuclear power station comprises a pull ring, a piston cylinder with two oil cavities, two damping valves and an oil pipe for communicating the two damping valves, wherein a ring buckle for fixing a ground foundation extends outwards from one end of a cylinder body of the piston cylinder, and the other end of the cylinder body is sealed through an oil cylinder cover; one end of a piston rod of the piston cylinder extends out of the cylinder cover of the oil cylinder and is connected with a pull ring, the outside of the pull ring is connected with a load, a piston of the piston cylinder is arranged on the piston rod and divides an inner cavity of the piston cylinder into two oil cavities which are defined as a first oil cavity and a second oil cavity; the two damping valves are defined as a first damping valve and a second damping valve, the first damping valve and the second damping valve are respectively arranged on the cylinder cover and the cylinder body of the oil cylinder, the first damping valve is communicated with a first oil cavity through a cylinder cover oil way arranged on the cylinder cover of the oil cylinder, and the second damping valve is communicated with a second oil cavity through a cylinder body oil way arranged on the cylinder body.
Preferably, the first damping valve and the second damping valve respectively comprise an adjusting rod, a valve cover, a valve body, a sleeve, a valve seat, a spring and a valve core, the valve seat of the first damping valve is fixed on the cylinder cover of the oil cylinder, the valve body is arranged in the valve seat, one end of the valve body is inserted into a first jack arranged on the cylinder cover of the oil cylinder, and the first jack is communicated with an oil way of the cylinder cover on the cylinder cover of the oil cylinder; a valve seat of the second damping valve is fixed on the cylinder body, the valve body is arranged in the valve seat, one end of the valve body is inserted into a second jack arranged on the cylinder body, and the second jack is communicated with an oil way of the cylinder body on the cylinder body; the other end of the valve body is fixed in the valve seat through the valve cover, the sleeve is arranged in the cavity of the valve body, the adjusting rod penetrates through the valve cover and is connected with one end of the sleeve, the lower end of the sleeve props against one end of a spring arranged in the cavity of the valve body, the other end of the spring props against one end of a valve core arranged in the cavity of the valve body, and one end of the valve core is limited through the inner wall surface of the cavity of the valve body where the valve core is arranged; the other end of the valve core props against the gasket and is limited by the retainer ring for the hole; the other end surface of the valve core body is internally concave to form a valve core oil cavity, and one end surface of the valve core body is externally convex along the axial direction to be provided with a convex column, the convex column is provided with a damping channel along the axial direction, and the damping channel is communicated with the valve core oil cavity; the valve core oil cavity of the first damping valve is communicated with a cylinder cover oil way on the cylinder cover of the oil cylinder, and the valve core oil cavity of the second damping valve is communicated with a cylinder body oil way on the cylinder body; the edge of the end face, which is in contact with the spring, of the valve core body is provided with a circle of inclined plane, a plurality of oil return holes are arranged on the inclined plane at intervals, and the oil return holes are communicated with the oil cavity of the valve core; the side wall of the sleeve is provided with at least one pair of communicated oil feeding holes, the valve body is provided with an oil duct communicated with the oil pipe, and the oil feeding holes are communicated with the oil duct.
Preferably, two ends of the oil pipe respectively extend into mounting holes formed in the valve seats in the first damping valve and the second damping valve, and two ends of the oil pipe are communicated with oil passages in the valve bodies in the first damping valve and the second damping valve.
Preferably, four oil feeding holes are uniformly distributed on the side wall of the sleeve, the four oil feeding holes are arranged in pairs in an opposite mode, and the two oppositely arranged oil feeding holes form a pair; the four oil ducts are arranged on the valve body and are in one-to-one correspondence with the four oil feeding holes, and the four oil ducts are in one-to-one correspondence with and communicated with the four oil feeding holes.
Preferably, the outer wall of the sleeve is provided with a first guide key groove along the axial direction, the inner cavity wall of the valve body is provided with a second guide key groove, and a guide key is arranged between the first guide key groove and the second guide key groove; the guide key is arranged to prevent the damping valve from rotating when the sleeve moves up and down when the compression amount of the spring is adjusted.
Preferably, all the oil feeding holes in the sleeve are located at the upper part of the sleeve, the first guide key groove in the outer wall of the sleeve is located at the lower part of the sleeve, the first guide key groove is located right below any one oil feeding hole, one end of the second guide key groove extends to the oil passage in the valve body, and one end of the second guide key groove penetrates through the oil passage.
Preferably, all the oil feeding holes in the sleeve are kidney-shaped holes which are arranged along the axial direction of the sleeve. The design purpose of the waist-shaped hole-shaped oil feeding hole is that the damping valve ensures that the oil feeding hole is communicated with the oil duct when the compression amount of the spring is adjusted.
Preferably, the inner wall surface of the valve body cavity for installing the valve core is provided with a circle of oil return grooves at the position corresponding to the oil return holes. The purpose of the oil return groove is to prevent hydraulic oil passing through the oil return hole 3102 from being blocked between the inner wall surface of a valve body cavity where the valve core is installed and the end surface of the valve core when the oil return hole 3102 is communicated.
Preferably, the protruding end of the adjusting rod is provided with an adjusting knob. The adjusting knob is made of metal materials, and is durable, corrosion-resistant and oxidation-resistant, and the adjusting knob is convenient for an operator to use.
Preferably, the cylinder body is provided with air holes which are communicated with the inner cavity of the cylinder body.
Compared with the prior art, the invention has the beneficial effects that:
1. the large hydraulic damper for the nuclear power station adjusts the closing speed of the damper by adjusting the compression amount of the damping valve spring.
2. The cross sectional area and the volume of the oil cavities on the left side and the right side of the large hydraulic damper for the nuclear power station are equal, and the consistency of the tensile rigidity and the compression rigidity of the damper is good.
3. According to the large hydraulic damper for the nuclear power station, the cross sectional areas of the left oil cavity and the right oil cavity are equal, a large amount of hydraulic oil is discharged from one oil cavity, and the same amount of hydraulic oil needs to be supplemented into the other oil cavity, so that an auxiliary oil cylinder does not need to be additionally arranged.
Drawings
Fig. 1 is an external view of a large hydraulic damper for a nuclear power plant according to the present embodiment.
Fig. 2 is a sectional view of the large hydraulic damper for a nuclear power plant according to the present embodiment.
Fig. 3 is an enlarged view of a portion of the second damping valve of fig. 2.
Fig. 4 is a partially enlarged view of the damper valve of fig. 3 (illustrating a state in which the damper valve is opened).
Fig. 5 is a partially enlarged view of the damper valve of fig. 3 (illustrating a state in which the damper valve is closed).
Fig. 6 is a component diagram of the sleeve of the present embodiment.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
In order to make the content of the present invention more comprehensible, the following description is further described with reference to fig. 1 to 6 and the detailed description.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in figure 1, the large hydraulic damper for the nuclear power station comprises a pull ring 8, a piston cylinder with two oil cavities, two damping valves and an oil pipe 5 for communicating the two damping valves.
As shown in fig. 1 and 2, a ring buckle for fixing a ground foundation extends outwards from one end of a cylinder body 1 of the piston cylinder, and the other end of the cylinder body 1 is sealed by a cylinder cover 9 of the oil cylinder; one end of a piston rod 2 of the piston cylinder extends out of a cylinder cover 9 of the oil cylinder and is connected with a pull ring 8, the outside of the pull ring 8 is connected with a load, a piston 4 of the piston cylinder is arranged on the piston rod 2, and the piston 4 divides an inner cavity of the piston cylinder into two oil cavities which are defined as a first oil cavity 101 and a second oil cavity 102; the two damping valves are defined as a first damping valve 6 and a second damping valve 3, the first damping valve 6 and the second damping valve 3 are respectively arranged on the cylinder cover 9 and the cylinder body 1, the first damping valve 6 is communicated with the first oil chamber 101 through a cylinder cover oil path 901 formed in the cylinder cover 9, and the second damping valve 3 is communicated with the second oil chamber 102 through a cylinder body oil path 104 formed in the cylinder body 1.
As shown in fig. 1, one end of the large hydraulic damper for a nuclear power plant of the present embodiment is connected to nuclear power plant equipment (a main pump, an evaporator, etc.), and the other end is connected to a ground foundation; namely, the pull ring 8 is connected with nuclear power station equipment, and the ground foundation is fixed by the buckle at one end of the cylinder body 1 of the piston cylinder.
As shown in fig. 3, each of the first damping valve 6 and the second damping valve 3 includes an adjustment lever 302, a valve cover 303, a valve body 304, a sleeve 305, a valve seat 307, a spring 309, and a valve spool 310.
As shown in fig. 2, a valve seat 307 of the first damping valve 6 is fixed on the cylinder head 9, the valve body 304 is installed in the valve seat 307, and one end of the valve body 304 is inserted into a first insertion hole formed in the cylinder head 9, and the first insertion hole is communicated with a cylinder head oil passage 901 in the cylinder head 9.
As shown in fig. 2, the valve seat 307 of the second damping valve 3 is fixed on the cylinder 1, the valve body 304 is installed in the valve seat 307, and one end of the valve body 304 is inserted into a second insertion hole formed in the cylinder 1, and the second insertion hole is communicated with the cylinder oil passage 104 on the cylinder 1.
As shown in fig. 3, the other end of the valve body 304 is fixed in the valve seat 307 by the valve cover 303, the sleeve 305 is arranged in the cavity of the valve body 304, the adjusting rod 302 penetrates the valve cover 303 and is connected with one end of the sleeve 305, and the adjusting rod 302 and the sleeve 305 are connected through the bolt 306. The lower end of the sleeve 305 props against one end of a spring 309 arranged in a cavity of the valve body 304, the other end of the spring 309 props against one end of a valve core 310 arranged in the cavity of the valve body 304, and one end of the valve core 310 is limited by the inner wall surface of the cavity of the valve body 304 where the valve core 310 is arranged; the other end of the spool 310 abuts a washer 311 and is retained by a retainer ring 312.
As shown in fig. 3, the other end surface of the valve core 310 body is concave to form a valve core oil cavity, and one end surface of the valve core 45 body is provided with a convex column along the axial direction, the convex column is provided with a damping channel 3101 along the axial direction, and the damping channel 3101 is communicated with the valve core oil cavity; the valve core oil chamber of the first damping valve 6 is communicated with a cylinder cover oil path 901 on the cylinder cover 9 of the oil cylinder, and the valve core oil chamber of the second damping valve 3 is communicated with a cylinder body oil path 104 on the cylinder body 1. It should be noted again that the damping channel 3101 on the spool 310 in the damping valve of the present embodiment is always communicated with the spool oil chamber.
As shown in fig. 3, the edge of the end surface of the valve core 310 body contacting with the spring 309 is provided with a circle of inclined surface, and a plurality of oil return holes 3102 are arranged on the inclined surface at intervals, and the oil return holes 3102 are communicated with the valve core oil cavity. As shown in fig. 3, the inner wall surface of the chamber of the valve body 304 in which the valve body 310 is mounted is provided with a ring of oil return grooves at positions corresponding to the oil return holes 3102. The purpose of the oil return groove is to prevent hydraulic oil passing through the oil return hole 3102 from being blocked between the inner wall surface of a valve body cavity where the valve core is installed and the end surface of the valve core when the oil return hole 3102 is communicated.
As shown in fig. 6, at least one pair of communicating oil feed holes 3051 are formed in the side wall of the sleeve 305, an oil passage communicating with the oil pipe 5 is formed in the valve body 304, and the oil feed holes 3051 are communicated with the oil passage. As shown in fig. 3, in this embodiment, four oil feed holes 3051 are uniformly distributed on the side wall of the sleeve 305, the four oil feed holes 3051 are arranged in pairs, and two oil feed holes 3051 arranged in pairs form a pair; the number of oil passages on the valve body 304 is four, the four oil passages are arranged in one-to-one correspondence with the four oil feeding holes 3051, and the four oil passages are in one-to-one correspondence with and communicated with the four oil feeding holes 3051.
As shown in fig. 3, a first guide key slot 3052 is axially formed on an outer wall of the sleeve 305, a second guide key slot is formed on an inner cavity wall of the valve body 304, and a guide key 308 is disposed between the first guide key slot and the second guide key slot. All the oil feeding holes 3051 in the sleeve 305 are located at the upper portion of the sleeve 305, the first guide key groove in the outer wall of the sleeve 305 is located at the lower portion of the sleeve 305, the first guide key groove is located right below any one of the oil feeding holes 3051, one end of the second guide key groove extends to the oil passage in the valve body 304, and one end of the second guide key groove penetrates through the oil passage. The purpose of the structural design is to prevent the damping valve from rotating in the up-and-down movement when the compression amount of the spring is adjusted by considering the installation of the guide key.
As shown in fig. 6, all the oil feed holes 3051 of the sleeve 305 are kidney-shaped holes opened along the axial direction of the sleeve 305. The design purpose of the waist-shaped hole-shaped oil feeding hole is that the damping valve ensures that the oil feeding hole is communicated with the oil duct when the compression amount of the spring is adjusted. The protruding end of the adjusting rod 302 is provided with an adjusting knob 301. The adjusting knob is made of metal materials, and is durable, corrosion-resistant and oxidation-resistant, and the adjusting knob is convenient for an operator to use. As shown in fig. 3. The cylinder body 1 is provided with an air hole 103, and the air hole 103 is communicated with the inner cavity of the cylinder body 1. The arrangement of the air holes 103 exhausts air. As shown in fig. 1.
As shown in fig. 3, two ends of the oil pipe 5 respectively extend into mounting holes formed in the valve seats 307 of the first damping valve 6 and the second damping valve 3, and two ends of the oil pipe 5 are both communicated with oil passages on the valve bodies 304 of the first damping valve 6 and the second damping valve 3.
As shown in fig. 1 and 2, in the damper of the present embodiment, when the damper is pressurized, the piston rod 2 drives the piston 4 to move to the right under the action of pressure, the hydraulic oil in the second oil chamber 104 is pressurized, and the hydraulic oil flows from the cylinder oil path 104 through the second damping valve 3, then flows through the first damping valve 6 via the oil pipe 5, and finally flows into the first oil chamber 101 via the cylinder head oil path 901. When the damper is under tension, the piston rod 2 drives the piston 4 to move leftwards under the action of the tension, hydraulic oil in the second oil moving cavity 104 is pressurized, and the hydraulic oil flows through the first damping valve 6 from the cylinder cover oil way 901, then flows through the second damping valve 3 through the oil pipe 5, and finally flows into the second oil cavity 102 through the cylinder body oil way 104.
In the damper of the embodiment, when the damper is pressurized, when the flow rate of the hydraulic oil is slow and the pressure is small, the hydraulic oil flows into the second damping valve 3 through the cylinder oil path 104; hydraulic oil flows to the valve spool 310, and due to the small oil pressure, the thrust of the hydraulic oil to the valve spool 310 cannot overcome the elastic force of the spring 309; the spool 310 is thus held lowermost, i.e., the spool 310 abuts against the washer 311 under the spring force of the spring 309; at this time, the hydraulic oil flows into the inner hole of the valve body 304 through the damping passage 3101 and the oil return hole 3102, and flows into the first oil chamber 101 through the oil pipe 5 and the first damping valve 6.
When the flow rate of the hydraulic oil is high and the pressure is high, the hydraulic oil flows into the second damping valve 3 through the cylinder oil path 104; hydraulic oil flows to the valve core 310, and due to the large oil pressure, the thrust of the hydraulic oil to the valve core 310 can overcome the elastic force of the spring 309; therefore, the valve core 310 is pushed to the top, that is, one end face of the valve core 310 is tightly attached to the inner wall surface of the chamber of the valve body 304 where the valve core 310 is installed; at this time, the oil return hole 3102 of the damping valve is locked and in a locked state, and at this time, the hydraulic oil can only flow into the inner hole of the valve body 304 through the damping channel 3101, and then flow into the first oil chamber 101 through the oil pipe 5 and the left damping valve.
When the damper of the present embodiment is pulled, the hydraulic oil in the damper flows to the opposite direction to when pressed, and the hydraulic oil flows from the first oil chamber 101 to the second oil chamber 102; the principle is the same as above.
The damper of the present embodiment adjusts the closing speed of the large hydraulic damper for a nuclear power plant according to the present embodiment by adjusting the compression amount of the spring 309 in the damper valve, and is specifically described as follows:
the adjusting knob 301 is rotated clockwise, the adjusting knob 301 drives the adjusting rod 302 to rotate, the adjusting rod 302 is connected with the valve cover 303 through threads, therefore, the adjusting rod 302 moves downwards and pushes the sleeve 305 to move downwards, the sleeve 305 moves downwards to compress the spring 309, the compression amount of the spring 309 is increased, and the elasticity of the spring 309 on the valve core 310 is also increased. To push the valve element 310 upward to close the damper, a greater hydraulic pressure is required, which increases the closing speed of the damper.
Similarly, by rotating the adjustment knob 301 counterclockwise, the amount of compression of the spring 309 can be reduced, and the elastic force of the spring 309 on the valve body 310 is also reduced. To push the valve element 310 upward to close the damper, less hydraulic oil pressure is required, which reduces the closing speed of the damper.
In the large hydraulic damper for a nuclear power plant of the present embodiment, the closing speed of the damper is adjusted by adjusting the compression amount of the damper valve spring 309. The cross sectional areas and the volumes of the first oil chamber and the second oil chamber are equal, and the consistency of the stretching rigidity and the compression rigidity of the damper is good. The cross-sectional areas of the first oil cavity and the second oil cavity are equal, so that a certain amount of hydraulic oil is discharged from the oil cavity on one side, and the same amount of hydraulic oil needs to be supplemented into the oil cavity on the other side, so that an auxiliary oil cylinder does not need to be additionally arranged.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The large hydraulic damper for the nuclear power station is characterized by comprising a pull ring (8), a piston cylinder with two oil cavities, two damping valves and an oil pipe (5) communicated with the two damping valves, wherein a ring buckle for fixing a ground foundation extends outwards from one end of a cylinder body (1) of the piston cylinder, and the other end of the cylinder body (1) is sealed through a cylinder cover (9) of the oil cylinder; one end of a piston rod (2) of the piston cylinder extends out of a cylinder cover (9) of the oil cylinder and is connected with a pull ring (8), the outside of the pull ring (8) is connected with a load, a piston (4) of the piston cylinder is arranged on the piston rod (2), and the piston (4) divides an inner cavity of the piston cylinder into two oil cavities which are defined as a first oil cavity (101) and a second oil cavity (102); the two damping valves are defined as a first damping valve (6) and a second damping valve (3), the first damping valve (6) and the second damping valve (3) are respectively arranged on the oil cylinder cover (9) and the oil cylinder body (1), the first damping valve (6) is communicated with a first oil cavity (101) through a cylinder cover oil way (901) arranged on the oil cylinder cover (9), and the second damping valve (3) is communicated with a second oil cavity (102) through a cylinder body oil way (104) arranged on the oil cylinder body (1).
2. The large hydraulic damper for the nuclear power station as recited in claim 1, wherein the first damping valve (6) and the second damping valve (3) each comprise an adjusting rod (302), a valve cover (303), a valve body (304), a sleeve (305), a valve seat (307), a spring (309) and a valve core (310), the valve seat (307) of the first damping valve (6) is fixed on the cylinder cover (9), the valve body (304) is arranged in the valve seat (307), one end of the valve body (304) is inserted into a first jack formed in the cylinder cover (9), and the first jack is communicated with a cylinder cover oil circuit (901) on the cylinder cover (9);
a valve seat (307) of the second damping valve (3) is fixed on the cylinder body (1), the valve body (304) is arranged in the valve seat (307), one end of the valve body (304) is inserted into a second jack formed in the cylinder body (1), and the second jack is communicated with a cylinder body oil way (104) in the cylinder body (1); the other end of the valve body (304) is fixed in a valve seat (307) through a valve cover (303), a sleeve (305) is arranged in a cavity of the valve body (304), an adjusting rod (302) penetrates through the valve cover (303) and is connected with one end of the sleeve (305), the lower end of the sleeve (305) props against one end of a spring (309) arranged in the cavity of the valve body (304), the other end of the spring (309) props against one end of a valve core (310) arranged in the cavity of the valve body (304), and one end of the valve core (310) is limited through the inner wall surface of the cavity of the valve body (304) where the valve core (310) is installed; the other end of the valve core (310) props against the gasket (311) and is limited by a hole check ring (312); the other end surface of the valve core (310) body is concave to form a valve core oil cavity, one end surface of the valve core (45) body is provided with a convex column which is convex outwards along the axial direction, the convex column is provided with a damping channel (3101) along the axial direction, and the damping channel (3101) is communicated with the valve core oil cavity; the valve core oil chamber of the first damping valve (6) is communicated with a cylinder cover oil path (901) on the cylinder cover (9) of the oil cylinder, and the valve core oil chamber of the second damping valve (3) is communicated with a cylinder body oil path (104) on the cylinder body (1); the edge of the end face, which is in contact with the spring (309), of the valve core (310) body is provided with a circle of inclined plane, a plurality of oil return holes (3102) are arranged on the inclined plane at intervals, and the oil return holes (3102) are communicated with an oil cavity of the valve core; the side wall of the sleeve (305) is provided with at least one pair of communicated oil feeding holes (3051), the valve body (304) is provided with an oil duct communicated with the oil pipe (5), and the oil feeding holes (3051) are communicated with the oil duct.
3. The large-scale hydraulic damper for the nuclear power station as recited in claim 2, wherein two ends of the oil pipe (5) respectively extend into mounting holes formed in the valve seats (307) in the first damping valve (6) and the second damping valve (3), and two ends of the oil pipe (5) are both communicated with oil passages on the valve bodies (304) in the first damping valve (6) and the second damping valve (3).
4. The large-scale hydraulic damper for the nuclear power station as recited in claim 2, wherein four oil feed holes (3051) are uniformly distributed on the side wall of the sleeve (305), the four oil feed holes (3051) are arranged in pairs in an opposite manner, and a pair of two oil feed holes (3051) arranged in an opposite manner is formed; the number of the oil passages on the valve body (304) is four, the four oil passages are arranged in one-to-one correspondence with the four oil feeding holes (3051), and the four oil passages are in one-to-one correspondence with the four oil feeding holes (3051) and communicated with each other.
5. A large-scale hydraulic damper for nuclear power plant according to claim 4, characterized in that the outer wall of the sleeve (305) is provided with a first guide key groove along the axial direction, the inner cavity wall of the valve body (304) is provided with a second guide key groove, and a guide key (308) is arranged between the first guide key groove and the second guide key groove.
6. The large hydraulic damper for the nuclear power plant as recited in claim 5, wherein all the oil feed holes (3051) of the sleeve (305) are located at an upper portion of the sleeve (305), a first guide key groove on an outer wall of the sleeve (305) is located at a lower portion of the sleeve (305), the first guide key groove is located directly below any one of the oil feed holes (3051), one end of a second guide key groove extends to the oil passage on the valve body (304), and one end of the second guide key groove penetrates through the oil passage.
7. The large-scale hydraulic damper for the nuclear power plant as recited in claim 6, wherein all the oil feed holes (3051) of the sleeve (305) are kidney-shaped holes formed along the axial direction of the sleeve (305).
8. The large hydraulic damper for nuclear power plant according to claim 2, wherein the inner wall surface of the chamber of the valve body (304) where the valve core (310) is installed is provided with a ring of oil return grooves at the position corresponding to the oil return hole (3102).
9. The large-scale hydraulic damper for nuclear power plant as recited in claim 1, characterized in that the protruding end of the adjusting rod (302) is provided with an adjusting knob (301).
10. The large-scale hydraulic damper for the nuclear power station as recited in claim 1, characterized in that the cylinder body (1) is provided with an air hole (103), and the air hole (103) is communicated with the inner cavity of the cylinder body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210285902.9A CN114658786A (en) | 2022-03-22 | 2022-03-22 | Large hydraulic damper for nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210285902.9A CN114658786A (en) | 2022-03-22 | 2022-03-22 | Large hydraulic damper for nuclear power station |
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| CN114658786A true CN114658786A (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210285902.9A Pending CN114658786A (en) | 2022-03-22 | 2022-03-22 | Large hydraulic damper for nuclear power station |
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