Oil cylinder guide sleeve device of hydraulic servo-motor of high-pressure valve of steam turbine and hydraulic servo-motor

Abstract

The utility model discloses an oil cylinder guide sleeve device of a hydraulic servo-motor of a steam turbine high-pressure throttle valve and the hydraulic servo-motor, which comprise a guide sealing device main body, a shaft hole arranged on the guide sealing device main body, and a piston rod inserted in the shaft hole, an annular assembling gap is reserved between the hole wall of the piston rod and a rod body of the piston rod, a guide sleeve is detachably installed in the assembling gap through a press-fitting structure, and the material hardness of the guide sleeve is lower than that of the piston rod. According to the oil cylinder guide sleeve device of the steam turbine high-pressure throttle valve hydraulic servo-motor and the hydraulic servo-motor, on one hand, abrasion to a piston rod is relieved and the piston rod is protected by additionally arranging the guide sleeve with lower material hardness, the problem of leakage of the hydraulic servo-motor is solved, on the other hand, the guide sleeve is detachably installed, maintenance and replacement are convenient, and the service life of the hydraulic servo-motor is prolonged. And maintenance cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil motors in the electric power industry, in particular to an oil cylinder guide sleeve device of a high-pressure steam valve regulating oil motor for a steam turbine and an oil motor. Background Art

[0002] The turbine throttle motor is the actuator for the turbine's high-pressure throttle valve, controlling the movement of the valve core and, in turn, adjusting the turbine load. The motor primarily consists of a spring chamber, cylinder body, electro-hydraulic servo valve, shutoff solenoid valve, shutoff slide valve, filter, displacement sensor, oil drain pan, and electrical junction box. During normal operation, high-pressure fire-resistant oil enters the piston chamber through the oil inlet. The piston drives the piston rod, overcoming the force of the compression disc spring, to move outward, opening the valve. During closing, the high-pressure fire-resistant oil pressure is relieved, and the spring force of the motor disc spring forces the piston rod inward, closing the valve. Within the motor's cylinder body, the piston and piston rod move in the cylinder. The axial seal between the piston rod and cylinder is called a guide seal. The guide seal utilizes rubber seals and polytetrafluoroethylene (PTFE) guide rings to prevent leakage of high-pressure fire-resistant oil from the axial relative motion between the piston rod and guide sleeve.

[0003] However, as attached Figure 1 As shown, the material of the guide seal device matrix (9) of the piston rod of the turbine valve regulating oil motor is stainless steel, and rubber seals (3, 4) and polytetrafluoroethylene guide seals (5, 6, 7) are installed in conjunction therewith. The material of the guide seal device matrix is similar to that of the piston rod, and the hardness of the two materials is close. During the operation of the unit, the turbine valve regulating oil motor frequently operates, and the oil motor guide seal device matrix (9) rubs against the piston rod (1), resulting in damage to the surface of the piston rod (1) and leakage of the oil motor. Utility Model Content

[0004] In response to the defects in the existing technology, the utility model provides a turbine high-pressure valve oil motor cylinder guide sleeve device and an oil motor. On the one hand, by adding a guide sleeve made of lower hardness material, the wear on the piston rod is reduced, the piston rod is protected, and the leakage problem of the oil motor is solved. On the other hand, the guide sleeve adopts a detachable installation, which is convenient for inspection and replacement, saving inspection and maintenance costs.

[0005] In order to achieve the above-mentioned purpose, the specific technical solutions adopted by the present utility model are as follows:

[0006] A guide sleeve device for a high-pressure steam valve oil motor cylinder of a steam turbine comprises a guide seal device mother body (200), an axial hole provided on the guide seal device mother body (200), and a piston rod (100) inserted into the axial hole. The key point is that a section of the axial hole is radially retreated to reserve an annular assembly gap between the hole wall and the rod body of the piston rod (100). A guide sleeve (500) is detachably installed in the assembly gap through a press-fit structure. The material hardness of the guide sleeve is lower than the material hardness of the piston rod (100).

[0007] Furthermore, the guide sealing device mother body (200) is made of stainless steel, and the guide sleeve (500) is made of brass.

[0008] Furthermore, the press-fitting structure includes a press ring (400) and a bolt (300). The press ring (400) is pressed against the end face of the guide sleeve (500) on the one hand, and is locked on the guide sealing device mother body (200) by the bolt (300) on the other hand.

[0009] Furthermore, a circle of recessed platforms is formed on the end surface of the guide sealing device mother body (200) corresponding to the assembly gap, and the pressure ring (400) is accommodated in the recessed platform, and a threaded hole adapted to the bolt (300) is opened on the surface of the recessed platform, and a flange adapted to the center hole of the pressure ring (400) is formed on the end surface of the guide sleeve (500).

[0010] Furthermore, the guide sleeve (500) is sealedly connected to the piston rod (100) via a first sealing assembly.

[0011] Furthermore, the first sealing assembly includes a first O-ring (103), a second O-ring (104), a first guide sealing ring (105), a second guide sealing ring (106) and a sealing ring (107).

[0012] Furthermore, the guide sleeve (500) is sealedly connected to the guide sealing device mother body (200) via a second sealing assembly.

[0013] Furthermore, the second sealing assembly includes a third O-ring (108) and a fourth O-ring (111).

[0014] Furthermore, the guide sleeve (500) is provided with a first oil unloading port (109) and a second oil unloading port (110) in the oil passage corresponding to the guide sealing device mother body (200).

[0015] Based on the above structure, a hydraulic motor is provided, the key of which is that it includes the cylinder guide sleeve device of the high-pressure steam valve hydraulic motor of the steam turbine described above.

[0016] Compared with the prior art, the remarkable effects of the present invention are:

[0017] (1) The utility model effectively reduces the wear of the piston rod by adding a guide sleeve made of a lower hardness material, thereby extending the service life of the piston rod and reducing the problem of oil motor leakage caused by piston rod wear;

[0018] (2) The guide sleeve adopts a detachable installation design, which makes it easy and quick to operate when the guide sleeve needs to be repaired or replaced, greatly saving the cost and time of repair and maintenance;

[0019] (3) The hardness of brass is between 70-80HV, which is significantly lower than that of stainless steel. This not only ensures the protective effect of the guide sleeve on the piston rod, but also avoids excessive friction resistance on the piston rod due to the excessive hardness of the guide sleeve;

[0020] (4) The guide sleeve is detachably installed in the assembly gap of the guide seal device body through the press-fit structure, making the installation and replacement of the guide sleeve very convenient. The pressure ring and bolts in the press-fit structure ensure the firmness and stability of the guide sleeve installation and prevent the guide sleeve from loosening or falling off during operation;

[0021] (5) Adding a sealing design between the piston rod and the guide sleeve, and between the guide seal device body and the guide sleeve, is beneficial to improving the overall sealing performance of the device, effectively preventing oil leakage, and ensuring the normal operation of the oil motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the internal structure of an oil motor in the prior art;

[0024] Figure 2 This is a schematic diagram of the internal structure of the oil cylinder guide sleeve device of the oil motor in Example 1;

[0025] Numbers in the figure: 100-piston rod, 200-mother body, 103-first O-ring, 104-second O-ring, 105-guide sealing ring, 106-guide sealing ring, 107 sealing ring, 108-third O-ring, 109-first oil unloading port, 110-second oil unloading port, 111-fourth O-ring, 300-bolt, 400-pressure ring, 500-guide sleeve. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0027] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0028] Figure 1 The first embodiment of the present invention is shown: a guide sleeve device for a high-pressure steam valve oil motor cylinder of a steam turbine, comprising a guide sealing device mother body 200, an axial hole opened on the guide sealing device mother body 200, and a piston rod 100 inserted into the axial hole, wherein a section of the axial hole is radially retreated to reserve an annular assembly gap between its hole wall and the rod body of the piston rod 100, and a guide sleeve 500 is detachably installed in the assembly gap by a press-fit structure, and the material hardness of the guide sleeve is lower than the material hardness of the piston rod 100.

[0029] In a specific implementation, the guide sealing device mother body 200 is made of stainless steel, and the guide sleeve 500 is made of brass.

[0030] In this embodiment, the press-fit structure includes a pressure ring 400 and a bolt 300. The pressure ring 400 abuts against the end face of the guide sleeve 500 and is locked to the guide seal device body 200 via the bolt 300. A recessed platform is formed on the end face of the guide seal device body 200, corresponding to the assembly gap. The pressure ring 400 is accommodated in the recessed platform, and a threaded hole is provided on the surface of the recessed platform to mate with the bolt 300. A flange is formed on the end face of the guide sleeve 500 to mate with the center hole of the pressure ring 400.

[0031] During assembly, the guide sleeve 500 is installed in the assembly gap using a press-fit mechanism. This mechanism includes bolts 300 and a press ring 400. Bolts 300 pass through the press ring 400 and connect with threaded holes in the guide seal body 200. Tightening the bolts 300 forces the press ring 400 to press the guide sleeve 500 into the assembly gap, achieving removable installation. This installation method is quick and convenient, and also facilitates subsequent maintenance and replacement.

[0032] In order to improve the overall guiding sealing performance of the device, the guide sleeve 500 is sealed with the piston rod 100 via a first sealing assembly. Specifically, the first sealing assembly includes a first O-ring 103, a second O-ring 104, a first guide sealing ring 105, a second guide sealing ring 106, and a sealing ring 107. The first guide sealing ring 105 and the second guide sealing ring 106 are made of oil-resistant rubber material, which has excellent sealing and wear resistance, can effectively prevent oil leakage, and improve the working efficiency and stability of the oil motor. The first O-ring 103, the second O-ring 104, and the sealing ring 107 are made of highly elastic rubber material, which has excellent sealing and elastic recovery capabilities and can adapt to working environments under different temperatures and pressures.

[0033] Furthermore, to further enhance the sealing effect, the guide sleeve 500 is sealed to the guide seal device body 200 via a second sealing assembly. Specifically, the second sealing assembly includes a third O-ring 108 and a fourth O-ring 111. Both the third O-ring 108 and the fourth O-ring 111 are also made of highly elastic rubber, offering excellent sealing and elastic recovery capabilities, adapting to operating environments with varying temperatures and pressures.

[0034] from Figure 2 It can also be seen that the guide sleeve 500 is provided with a first oil unloading port 109 and a second oil unloading port 110 corresponding to the oil passage of the guide sealing device mother body 200 .

[0035] Based on the above structure, this embodiment further discloses an oil motor, including the above-described turbine high-pressure steam valve oil motor cylinder guide sleeve device.

[0036] In summary, the present invention effectively reduces the wear of the piston rod 100 by adding a guide sleeve 500 with lower material hardness, thereby extending the service life of the piston rod 100 and reducing the oil motor leakage problem caused by the wear of the piston rod 100; the guide sleeve 500 adopts a detachable installation design, so that when the guide sleeve 500 needs to be repaired or replaced, the operation can be carried out conveniently and quickly, which greatly saves the cost and time of repair and maintenance; the hardness of brass is between 70-80HV, which is significantly lower than the hardness of stainless steel, which not only ensures the protective effect of the guide sleeve 500 on the piston rod 100, but also avoids excessive friction resistance to the piston rod 100 due to the high hardness of the guide sleeve 500; the guide sleeve 500 is detachably installed in the assembly gap of the guide sealing device mother body 200 through a press-fit structure, which makes the installation and replacement of the guide sleeve 500 very convenient. The pressure ring 400 and the bolt 300 in the press-fit structure ensure the firmness and stability of the installation of the guide sleeve 500, and prevent the guide sleeve from loosening or falling off during operation; adding a sealing design between the piston rod 100 and the guide sleeve 500, and between the guide sealing device mother body 200 and the guide sleeve 500 is beneficial to improving the overall sealing performance of the device, effectively preventing oil leakage, and ensuring the normal operation of the oil motor.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A guide sleeve device for a high-pressure steam valve oil motor cylinder of a steam turbine, comprising a guide seal device matrix (200), an axial hole formed in the guide seal device matrix (200), and a piston rod (100) inserted into the axial hole, characterized in that: A section of the axial hole is radially retreated to reserve an annular assembly gap between its hole wall and the rod body of the piston rod (100), and a guide sleeve (500) is detachably installed in the assembly gap through a press-fit structure, and the material hardness of the guide sleeve is lower than the material hardness of the piston rod (100).

2. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 1 is characterized in that: The guide sealing device mother body (200) is made of stainless steel, and the guide sleeve (500) is made of brass.

3. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 1 or 2, characterized in that: The press-fit structure includes a press ring (400) and a bolt (300). The press ring (400) abuts against the end face of the guide sleeve (500) on one hand, and is locked on the guide sealing device mother body (200) through the bolt (300) on the other hand.

4. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 3 is characterized in that: A concave platform is formed on the end surface of the guide sealing device mother body (200) corresponding to the assembly gap, and the pressure ring (400) is accommodated in the concave platform. A threaded hole adapted to the bolt (300) is opened on the surface of the concave platform, and a flange adapted to the center hole of the pressure ring (400) is formed on the end surface of the guide sleeve (500).

5. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 1 or 4, characterized in that: The guide sleeve (500) is sealedly connected to the piston rod (100) via a first sealing assembly.

6. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 5, characterized in that: The first sealing assembly comprises a first O-ring (103), a second O-ring (104), a first guide sealing ring (105), a second guide sealing ring (106) and a sealing ring (107).

7. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 6, characterized in that: The guide sleeve (500) is sealedly connected to the guide sealing device mother body (200) via a second sealing assembly.

8. The turbine high-pressure valve oil motor cylinder guide sleeve device according to claim 7, characterized in that: The second sealing assembly includes a third O-ring (108) and a fourth O-ring (111).

9. The guide sleeve device for the cylinder of the high-pressure valve oil motor of a steam turbine according to any one of claims 1, 2, 4, 6, 7, and 8, characterized in that: The guide sleeve (500) is provided with a first oil unloading port (109) and a second oil unloading port (110) in the oil passage corresponding to the guide sealing device mother body (200).

10. An oil motor, characterized in that: It comprises a turbine high-pressure valve oil motor cylinder guide sleeve device as described in any one of claims 1-9.

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