A disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant

Abstract

The present invention belongs to the field of nuclear power, and specifically relates to a disassembly and assembly device for a valve position feedback device for a steam turbine oil motor in a nuclear power plant. The device comprises a left handle, a disassembly and assembly cylinder, and a right handle. The left and right handles are detachably mounted on the disassembly and assembly cylinder. The disassembly and assembly cylinder is a hollow cylindrical structure. The hollow structure inside the disassembly and assembly cylinder is used to accommodate the valve position feedback device head. The bottom of the disassembly and assembly cylinder is provided with a hexagonal slot sized to match the valve position feedback device screw head. This device enables rapid disassembly during valve position feedback device replacement, improving work efficiency and better protecting equipment.

Description

Technical Field

[0001] The invention belongs to the field of nuclear power, and in particular relates to a disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant. Background Art

[0002] The hydraulic motor in a nuclear power plant steam turbine is the actuator that controls the high-pressure steam inlet valves of the turbine unit. It is used to open and close the high- and medium-pressure main steam valves and high- and medium-pressure regulating valves. The valve opening signal from the hydraulic motor is transmitted to the turbine servo card and turbine regulating controller via an LVDT (Linear Variable Differential Transformer, or valve position feedback device), achieving closed-loop control of valve opening. The valve position feedback device consists of a gauge head and a probe rod, which is fixed to the hydraulic motor via internal threads. Disassembly of the valve position feedback device relies on a hexagonal structure on the outside to apply force. The probe rod is 60 cm long and provides complete feedback on the valve opening of the hydraulic motor. The gauge head has a hexagonal thread that connects to an external disassembly tool. The gauge head and probe rod are threaded together, and the connection is sealed with a rubber ring.

[0003] Currently, due to the large size of the hexagonal thread and the lack of dedicated disassembly tools provided by the manufacturer, disassembly is difficult. Using a non-standard device risks damaging the meter head, and it cannot be properly tightened during installation. Therefore, it is necessary to develop a valve position feedback device disassembly and assembly device that fits the hexagonal thread of the meter head while facilitating on-site disassembly and tightening. Summary of the Invention

[0004] The purpose of the present invention is to provide a disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant, so as to quickly complete the disassembly operation during the replacement of the valve position feedback device, improve work efficiency, and better protect the equipment.

[0005] The technical solutions of the present invention are as follows:

[0006] A disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant comprises a left handle, a disassembly and assembly cylinder, and a right handle; wherein the left and right handles are detachably mounted on the disassembly and assembly cylinder; the disassembly and assembly cylinder is a hollow cylindrical structure; the hollow structure inside the disassembly and assembly cylinder is used to accommodate a valve position feedback device head; a hexagonal slot is provided at the bottom, the size of which matches the valve position feedback device screw head.

[0007] Furthermore, the interior of the disassembly and assembly cylinder is a through-hole hexagonal hollow structure, the size of which is consistent with the hexagonal slot.

[0008] Furthermore, the bottom of the disassembly and assembly cylinder is a hexagonal hollow structure, the size of which is consistent with the hexagonal slot, and the upper part of the interior is a cylindrical hollow structure, the size of which is larger than the valve position feedback device head.

[0009] Furthermore, the detachable manner includes a threaded connection or a snap connection.

[0010] Furthermore, two holes are provided on the upper side of the disassembly and assembly cylinder for installing the left handle and the right handle.

[0011] Furthermore, the two holes are threaded holes or snap holes.

[0012] Furthermore, the two holes are symmetrically arranged.

[0013] Furthermore, a hollow hole is provided on the side wall of the disassembly and assembly cylinder to reduce the weight of the disassembly and assembly device.

[0014] Furthermore, the number of the hollow holes is -, and the hollow holes are symmetrically arranged.

[0015] The method for using the disassembly and assembly device described in the present invention is characterized in that it includes the following steps: installing and fixing the left handle and the right handle on the disassembly and assembly tube; sleeve the disassembly and assembly tube on the valve position feedback device head, fix it through the hexagonal slot and the valve position feedback device screw head, and use the handle to rotate the disassembly and assembly tube to realize the disassembly and assembly operation of the valve position feedback device.

[0016] The remarkable effects of the present invention are:

[0017] (1) The joint surface between the disassembly and assembly device and the valve position feedback device is a hexagonal design. This structure can be used to clamp the hexagonal screw head of the valve position feedback device. The force point of the entire tool on the valve position feedback device is only located at the inner hexagon position at the bottom, and will not apply force to other parts of the meter head and cause damage to the parts;

[0018] (2) The hexagonal screw head of the valve position feedback device is evenly stressed, and the disassembly and assembly device and the valve position feedback device are tightly fitted at the connection to avoid the disassembly and assembly device falling off and the valve position feedback device being unevenly stressed and deformed;

[0019] (3) Separate disassembly and assembly device, which separates the two handles from the disassembly and assembly cylinder and connects them through threads or snaps. It is easy to assemble and can be used in different on-site environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a top view of the disassembly and assembly device of the present invention;

[0021] Figure 2 This is a schematic diagram of the disassembly and assembly device of the present invention;

[0022] Figure 3 This is a three-view diagram of the disassembly and assembly device of the present invention;

[0023] Figure 4 Three views of the handle of the disassembly and assembly device of the present invention.

[0024] In the figure: 1-left handle; 2-disassembly tool; 3-right handle; 4-valve position feedback meter head; 5-valve position feedback screw head; 6-valve position feedback probe rod. DETAILED DESCRIPTION

[0025] The technical solution provided by the invention is further described below with reference to the accompanying drawings and examples. The terms "upper", "lower" and similar expressions used herein are for illustrative purposes only.

[0026] like Figures 1 to 4 The shown device is a disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant, comprising a left handle 1, a disassembly and assembly cylinder 2, and a right handle 3; wherein the left handle 1 and the right handle 3 are detachably mounted on the disassembly and assembly cylinder 2; the disassembly and assembly cylinder 2 is a hollow cylindrical structure, and the hollow structure inside the disassembly and assembly cylinder 2 is used to accommodate a valve position feedback device head 4, and a hexagonal slot is provided at the bottom, the size of which matches the valve position feedback device screw head 5.

[0027] Furthermore, the interior of the disassembly and assembly cylinder 2 is a through-hole hexagonal hollow structure, the size of which is consistent with the hexagonal slot.

[0028] Furthermore, the bottom of the disassembly and assembly cylinder 2 is a hexagonal hollow structure, the size of which is consistent with the hexagonal slot, and the upper part of the interior is a cylindrical hollow structure, the size of which is larger than the valve position feedback device head 4.

[0029] Furthermore, the detachable manner includes a threaded connection or a snap connection.

[0030] Furthermore, two holes are provided on the upper side of the disassembly and assembly cylinder 2 for installing the left handle 1 and the right handle 3.

[0031] Furthermore, the two holes are threaded holes or snap holes.

[0032] Furthermore, the two holes are symmetrically arranged.

[0033] Furthermore, a hollow hole is provided on the side wall of the disassembly and assembly cylinder 2 to reduce the weight of the disassembly and assembly device.

[0034] Furthermore, the number of the hollow holes is 2-4, and the hollow holes are symmetrically arranged.

[0035] The method for using the disassembly and assembly device described in the present invention is characterized in that it includes the following steps: installing and fixing the left handle 1 and the right handle 3 on the disassembly and assembly tube 2; sleeve the disassembly and assembly tube 2 on the valve position feedback device head 4, fix it through the hexagonal slot and the valve position feedback device screw head 5, and use the handle to rotate the disassembly and assembly tube 2 to realize the disassembly and assembly operation of the valve position feedback device.

[0036] In summary, the disassembly and assembly device described in the present invention can solve the problems of the lack of a dedicated disassembly and assembly device for the hydraulic motor valve position feedback device and the possible damage to the meter head during disassembly and assembly, thereby improving the efficiency of replacing or inspecting the valve position feedback device.

[0037] The disassembly and assembly device described in the present invention has two holes on the upper part for connecting two handles to facilitate personnel to apply force; the disassembly and assembly cylinder 2 is hollowed out to reduce the weight of the device and facilitate on-site carrying and use; the connection part between the disassembly and assembly device described in the present invention and the valve position feedback device is an internal hexagon, so that the disassembly and assembly device fits tightly with the six faces of the LVDT screw head, avoiding deformation or damage of the valve position feedback device caused by uneven force.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant, characterized by: The utility model comprises a left handle (1), a disassembly cylinder (2), and a right handle (3); wherein the left handle (1) and the right handle (3) are detachably mounted on the disassembly cylinder (2); the disassembly cylinder (2) is a hollow cylindrical structure, the hollow structure inside the disassembly cylinder (2) is used to accommodate a valve position feedback device head (4), and a hexagonal slot is provided at the bottom, the size of which matches the valve position feedback device screw head (5); The side wall of the disassembly and assembly cylinder (2) is provided with a hollow hole for reducing the weight of the disassembly and assembly device.

2. A disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 1, characterized in that: The interior of the disassembly and assembly cylinder (2) is a through-hole hexagonal hollow structure, the size of which is consistent with the hexagonal slot.

3. The disassembly and assembly device for the valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 1, characterized in that: The bottom of the disassembly and assembly cylinder (2) is a hexagonal hollow structure, the size of which is consistent with the hexagonal slot, and the upper part of the interior is a cylindrical hollow structure, the size of which is larger than the valve position feedback device head (4).

4. The disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 1, characterized in that: The detachable manner includes a threaded connection or a snap connection.

5. The disassembly and assembly device for the valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 1, characterized in that: The upper side of the disassembly and assembly cylinder (2) is provided with two holes for installing the left handle (1) and the right handle (3).

6. A disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 5, characterized in that: The two holes are threaded holes or snap holes.

7. The disassembly and assembly device for the valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 5, characterized in that: The two holes are symmetrically arranged.

8. The disassembly and assembly device for a valve position feedback device of a steam turbine oil motor in a nuclear power plant according to claim 1, characterized in that: The number of the hollow holes is 2-4, and the hollow holes are symmetrically arranged.

9. The method for using the disassembly and assembly device of the valve position feedback device of the steam turbine oil motor of a nuclear power plant according to claim 1, characterized in that: The method comprises the following steps: fixing the left handle (1) and the right handle (3) on the disassembly and assembly cylinder (2); sleeve the disassembly and assembly cylinder (2) on the valve position feedback device head (4), fix the disassembly and assembly cylinder (2) through the hexagonal slot and the valve position feedback device screw head (5), and use the handle to rotate the disassembly and assembly cylinder (2) to realize the disassembly and assembly operation of the valve position feedback device.

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