Oil pressing cylinder and hydraulic turbine governor oil pressing device

Abstract

The utility model relates to the technical field of hydroelectric power generation equipment, in particular to an oil pressing cylinder and a hydraulic turbine governor oil pressing device. Comprising a control box shell, a pressure oil cylinder arranged outside the control box shell and a non-return piece arranged outside the pressure oil cylinder; and the energy-saving assembly comprises a reservoir connected with the first access pipe, an oil return tank connected with the pressure oil cylinder, and an oil pump between the oil return tank and the pressure oil cylinder. The oil tank pressure oil cylinder has the advantages that the non-return part is connected with the access pipeline, so that oil can be stably input from the oil tank pressure oil cylinder, and the pressure in the pressure oil cylinder is stabilized; the pressure oil cylinder is connected with the upstream water storage tank, and pressure is provided for the pressure oil cylinder through energy storage of water flow with pressure in the upstream water storage tank, so that the device is simple in structural design, high in reliability and convenient to operate and maintain, it is guaranteed that the operation pressure of a water turbine speed regulating system is constant, and it is guaranteed that a water turbine speed regulator acts stably and accurately; the energy utilization rate is improved and the energy loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydroelectric power generation equipment, in particular to an oil pressure cylinder and an oil pressure device for a turbine speed governor. Background Art

[0002] The oil pressure cylinder usually refers to a part of the turbine speed control system, which is used to control the speed of the turbine. The turbine is a device in a hydropower station that converts water energy into mechanical energy, and the oil pressure cylinder is a key component in the turbine speed control system. It provides the governor with pressurized oil that meets its requirements, thereby achieving speed control of the generator set. The oil pressure cylinder is used to store the operating medium of the governor - pressurized oil. The oil pressure device maintains the pressure and oil volume of the oil pressure cylinder or oil pressure tank to meet the requirements of normal operation and emergency shutdown of the turbine. When the oil pressure cylinder is not input with oil, the pressure in the oil pressure cylinder may cause the oil in the oil pressure cylinder to flow back to the oil pump due to the pressure in the oil pressure cylinder, resulting in insufficient pressure in the oil pressure cylinder.

[0003] The existing hydraulic system of the turbine speed governor mainly uses compressed air energy storage and turbine oil as the operating medium. This type of oil pressure device can store the energy of the operating guide vanes in the form of compressed air, ensuring sufficient energy during operation and meeting the normal and emergency operation needs of the guide vanes. However, there are also many problems with the hydraulic system of the compressed air energy storage type speed governor. First of all, the structure of this device is complex, including a pressure oil tank, a pressure gas tank, an oil pump motor unit, an air supply device, etc., and a special compressed air system is required to provide the gas tank with clean compressed air that meets the pressure requirements, and the operation and maintenance requirements are high. Secondly, during the operation of this oil pressure device, as the energy in the compressed air is released, its pressure will decrease and the pressure fluctuation will be large. Utility Model Content

[0004] In view of the above existing technical problems, the present utility model is proposed.

[0005] To solve the above technical problems, the utility model provides the following technical solutions: a hydraulic cylinder, which includes a pressure assembly, including a control box housing, a hydraulic cylinder arranged outside the control box housing, and a check member arranged outside the hydraulic cylinder.

[0006] As a preferred solution of the oil pressure cylinder of the utility model, wherein: a first access pipe is connected to the upper part of the oil pressure cylinder, and a second access pipe is connected to the lower part of the oil pressure cylinder.

[0007] As a preferred solution of the oil pressure cylinder of the utility model, a piston is arranged inside the oil pressure cylinder, and the piston is located between the first access pipe and the second access pipe.

[0008] As a preferred solution of the hydraulic cylinder of the utility model, the non-return member includes an expansion tube arranged concentrically with the second access tube and a non-return plate arranged in the expansion tube, wherein the radius of the expansion tube is larger than that of the second access tube.

[0009] As a preferred solution of the oil pressure cylinder of the utility model, wherein: the outer wall of the check plate is provided with a sealing ring, and the sealing ring is movably matched with the expansion tube.

[0010] As a preferred solution of the oil pressure cylinder of the utility model, wherein: a guide plate is arranged on the side of the check plate away from the sealing ring, and a guide groove is opened on the guide plate.

[0011] As a preferred solution of the oil cylinder of the utility model, wherein: a cylinder is movably arranged inside the check plate, a limit plate is arranged on the end face of the cylinder, the limit plate is movably matched with the check plate, and a drainage groove is opened on the end face of the limit plate.

[0012] As a preferred solution of the oil pressure cylinder of the utility model, wherein: a mounting frame is arranged inside the expansion tube, the mounting frame is fixedly connected to the cylinder body, and a spring is arranged between the mounting frame and the check plate.

[0013] The beneficial effect of the oil pressure cylinder of the utility model is that the oil can only be stably input from the oil tank to the oil pressure cylinder by connecting with the access pipeline through the non-return piece, so as to stabilize the pressure in the oil pressure cylinder.

[0014] Another object of the utility model is to provide an oil pressure device for a turbine speed governor, which aims to solve the problems of complex structure and large pressure fluctuation of compressed air energy storage type speed governors.

[0015] In order to solve the above technical problems, the utility model also provides the following technical solutions: a turbine speed governor oil pressure device, which includes an oil pressure cylinder; and an energy-saving component, including a water reservoir connected to the first access pipe, an oil return tank connected to the oil pressure cylinder, and an oil pump arranged between the oil return tank and the oil pressure cylinder.

[0016] As a preferred solution of the turbine speed governor oil pressure device of the utility model, wherein: the oil pump is connected to a pressure sensor, a hydraulic motor is also arranged between the return oil tank and the oil pressure cylinder, the hydraulic motor is connected to a hydraulic pump, and one end of the hydraulic pump is connected to a pressure regulating valve.

[0017] The beneficial effects of the turbine speed governor oil pressure device of the utility model are as follows: by connecting the oil pressure cylinder with the upstream water reservoir, the pressurized water flow in the upstream water reservoir is used to store energy to provide pressure in the oil pressure cylinder, so that the structure design of the device is simple, the reliability is high, and the operation and maintenance are convenient, so that the operating pressure of the turbine speed control system is constant, and the operation of the turbine speed governor is ensured to be smooth and accurate; and the energy utilization rate is improved and the energy loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0019] Figure 1 It is an overall schematic diagram of the oil pressure cylinder in the utility model.

[0020] Figure 2 It is a cross-sectional view of the oil pressure cylinder in the utility model.

[0021] Figure 3 It is an enlarged view of point A in the present utility model.

[0022] Figure 4 It is a cross-sectional view of the check member in the utility model.

[0023] Figure 5 It is an overall schematic diagram of the speed regulating oil pressing device in the utility model. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1, reference Figure 1 to Figure 4, which is the first embodiment of the utility model, provides a hydraulic cylinder, including a pressure assembly 100, including a control box housing 101, a hydraulic cylinder 102 arranged outside the control box housing 101, and a check member 103 arranged outside the hydraulic cylinder 102.

[0028] Preferably, two pressure cylinders 102 are provided, and a control module capable of controlling the switching of two different pressure cylinders 102 is provided in the control box housing 101. When the pressure provided by one of the pressure cylinders 102 is unstable or the pressure cylinder 102 is damaged, the control module on the control box housing 101 is used to switch to the other pressure cylinder 102 to ensure that the pressure cylinder 102 can provide stable pressure.

[0029] Furthermore, the locking member 103 is located between the oil pump 203 and the oil pressure cylinder 102 to prevent the oil in the oil pressure cylinder 102 from flowing back.

[0030] A first access pipe 102 a is connected to the top of the hydraulic cylinder 102 , and a second access pipe 102 b is connected to the bottom of the hydraulic cylinder 102 .

[0031] Preferably, the first access pipe 102a is used to connect to the upstream reservoir, i.e., the water reservoir 201, and utilizes the pressurized water flow taken from the front of the hydropower station dam to store energy, which is directly input into the oil cylinder 102 to provide pressure for the oil cylinder 102; the oil cylinder 102 is also connected to the third access pipe 102d, and the third access pipe 102d is located below the piston 102c and above the second access pipe 102b, and the third access pipe 102d connects the hydraulic motor 205 and the hydraulic pump 207; that is, the water reservoir 201 and the oil cylinder 102 are one circuit, the oil cylinder 102 and the hydraulic motor 205 are the second circuit, and the oil cylinder 102 and the return oil tank 202 are the third circuit.

[0032] A piston 102c is disposed inside the hydraulic cylinder 102, and the piston 102c is located between the first access pipe 102a and the second access pipe 102b.

[0033] Preferably, the oil pressure cylinder 102 is a closed oil cylinder, which is separated by a piston 102c in the middle and is divided into a pressure water chamber and a pressure oil chamber. The pressure water chamber is connected to the front of the hydropower station dam through the first access pipe 102a, and the pressure oil chamber is connected to the hydraulic motor 205 and the hydraulic pump 207 unit through the third access pipe 102d. The oil pressure cylinder 102 is connected to the oil pump 206 through the second access pipe and is connected to the return oil tank 202.

[0034] The non-return member 103 includes an expansion tube 103a arranged concentrically with the second access tube 102b and a non-return plate 103b arranged in the expansion tube 103a, wherein the radius of the expansion tube 103a is greater than that of the second access tube 102b.

[0035] Preferably, the expansion tube 103a is in an arc shape, the radius of the check plate 103b is greater than the radius of the second access tube 102b, and the check plate 103b is located away from the oil cylinder 102 to prevent oil from flowing back.

[0036] A sealing ring 103c is disposed on the outer wall of the check plate 103b, and the sealing ring 103c is movably matched with the expansion tube 103a.

[0037] Preferably, the sealing ring 103c is fixedly connected to the check plate 103b, and the sealing plate 103c is located away from the oil pressure cylinder 102. The sealing ring 103c is made of rubber material. When there is no oil in the tube, the sealing ring 103c can be tightly attached to the inner wall of the expansion tube 103a.

[0038] A guide plate 103d is provided on the side of the check plate 103b away from the sealing ring 103c, and a guide groove 103j is provided on the guide plate 103d.

[0039] Preferably, the guide plate 103d is fixedly connected to the check plate 103b, a plurality of guide grooves 103j are arranged in an array, and the guide grooves 103j are arc-shaped, and the arc-shaped opening of the guide grooves 103j is oriented away from the sealing ring 103c. The guide grooves 103j are arranged to disperse a portion of the pressure of the oil on the check plate 103b when the oil flows back.

[0040] A cylinder 103e is movably disposed inside the check plate 103b, a limit plate 103f is disposed on the end surface of the cylinder 103e, the limit plate 103f is movably matched with the check plate 103b, and a drainage groove 103g is provided on the end surface of the limit plate 103f.

[0041] Preferably, a plurality of drainage grooves 103g are provided in the array, and the openings of the plurality of drainage grooves 103g are inclined, with the inclination direction toward one side of the sealing plate 103c. Through the arrangement of the drainage grooves 103g, when the oil is introduced, the oil can be in contact with the check plate 103b more evenly, so that the sealing plate 103c can be separated from the contact with the inner wall of the expansion tube 103a as soon as possible, and the oil can enter the oil pressure cylinder 102 faster.

[0042] A mounting frame 103i is provided inside the expansion tube 103a, the mounting frame 103i is fixedly connected to the cylinder 103e, and a spring 103h is provided between the mounting frame 103i and the check plate 103b.

[0043] In summary, when the oil needs to enter the oil cylinder 102, the oil contacts the check plate 103b through the second access tube 102b, compressing the spring 103h, so that the sealing plate 103c is separated from the contact with the inner wall of the expansion tube 103a, and the sealing plate 103c slides axially along the second access tube 102b, so that the oil can flow into the oil cylinder 102 from the gap between the sealing plate 103c and the expansion tube 103a. When the oil flows back, since the sealing plate 103c is facing away from the oil cylinder 102, the oil pressure in the oil cylinder 102 will make the contact between the check plate 103c and the expansion tube 103a tighter, thereby preventing the oil from flowing back.

[0044] Example 2, reference Figure 1 to Figure 5 , which is the second embodiment of the utility model, and further provides a turbine governor oil pressure device. It includes an energy-saving component 200, including a water storage tank 201 connected to the first access pipe 102a, an oil return tank 202 connected to the oil pressure cylinder 102, and an oil pump 203 arranged between the oil return tank 202 and the oil pressure cylinder 102.

[0045] Preferably, the return oil tank 202 is used to provide a non-pressurized backup oil source to the pressure oil tank and store the governor oil returned after being used by the turbine movable guide vanes; the oil pump 203 is used to raise the oil level to the required height when the oil level of the oil pressure device decreases.

[0046] The oil pump 203 is connected to a pressure sensor 204 . A hydraulic motor 205 is provided between the oil return tank 202 and the oil pressure cylinder 102 . The hydraulic motor 205 is connected to a hydraulic pump 207 . One end of the hydraulic pump 207 is connected to a pressure regulating valve 206 .

[0047] Preferably, the hydraulic motor 206 utilizes the hydraulic pressure in the pressure oil tank to drive the hydraulic motor 206 to rotate and generate motive force; the hydraulic pump 207 is driven by the hydraulic motor 206 to pressurize the pressure oil with a relatively low inlet pressure of the hydraulic pump 207 to a pressure that meets the operating requirements of the turbine guide vanes; the pressure regulating valve 206 is a throttle valve or a proportional valve, which adjusts the flow and direction of the governor pressure oil according to the change of the turbine speed, and then controls the turbine guide vanes to open or close, thereby controlling the turbine speed, and the control signal of the speed regulating valve comes from the turbine governor;

[0048] In summary, the oil in the return oil tank 202 is transported to the pressure oil chamber of the pressure oil cylinder 102 through the oil pump 203 until the oil volume meets the demand; the pressure water chamber of the pressure oil cylinder 102 is introduced into the pressure water chamber of the pressure oil cylinder 102, and the pressurized water source is taken from the upstream of the hydropower station, and the pressurized water source generated by the water level difference between the upstream and downstream of the hydropower station is used to compress the governor oil located in the pressure oil chamber through the piston 102c to generate pressure oil with initial pressure; if the initial pressure does not meet the needs of the turbine governor system, the governor oil is pressurized to meet the operation requirements of the turbine governor by using a hydraulic motor booster composed of a low-pressure hydraulic motor 205 and a high-pressure hydraulic pump 207.

[0049] During the operation of the turbine speed control system, the pressure regulating valve 206 adjusts the oil flow entering the guide vanes as required, thereby controlling the opening or closing of the turbine guide vanes, thereby achieving turbine speed control;

[0050] During the operation of the turbine speed control system, when the oil volume in the pressure oil chamber of the pressure oil cylinder 102 is insufficient, the oil pump 203 is started, and when the oil volume is sufficient, the pump is stopped, so that the oil volume in the pressure oil cylinder 102 meets the operation requirements of the speed regulator.

[0051] The device stores the pressure oil for the speed governor after being pressurized by the oil pump 203 motor through the oil pressure cylinder 102, uses the pressurized water flow in front of the hydropower station dam to store energy, that is, the reservoir 201, and then pressurizes the pressure oil with a low inlet pressure of the hydraulic pump 207 through the hydraulic motor 205 booster to a pressure that meets the operating requirements of the turbine guide vanes. The device has a simple structure and low manufacturing cost; it can ensure that the operating pressure of the turbine speed control system is constant; and at the same time, it can greatly simplify the pressure increase and pressure relief operations of the hydraulic system of the turbine speed governor.

[0052] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0053] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0054] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A hydraulic cylinder, characterized in that: include, The pressure assembly (100) comprises a control box housing (101), a pressure oil cylinder (102) arranged outside the control box housing (101), and a check member (103) arranged outside the pressure oil cylinder (102).

2. The oil pressure cylinder according to claim 1, characterized in that: The upper part of the oil pressure cylinder (102) is connected to a first access pipe (102a), and the lower part of the oil pressure cylinder (102) is connected to a second access pipe (102b).

3. The oil pressure cylinder according to claim 2, characterized in that: A piston (102c) is disposed inside the oil pressure cylinder (102), and the piston (102c) is located between the first access pipe (102a) and the second access pipe (102b).

4. The oil pressure cylinder according to claim 3, characterized in that: The non-return member (103) comprises an expansion tube (103a) arranged concentrically with the second access tube (102b) and a non-return plate (103b) arranged in the expansion tube (103a), wherein the radius of the expansion tube (103a) is greater than that of the second access tube (102b).

5. The oil pressure cylinder according to claim 4, characterized in that: The outer wall of the check plate (103b) is provided with a sealing ring (103c), and the sealing ring (103c) is movably matched with the expansion tube (103a).

6. The oil pressure cylinder according to claim 5, characterized in that: A guide plate (103d) is provided on the side of the check plate (103b) away from the sealing ring (103c), and a guide groove (103j) is provided on the guide plate (103d).

7. The oil pressure cylinder according to claim 6, characterized in that: A cylinder (103e) is movably arranged inside the check plate (103b), a limit plate (103f) is arranged on the end surface of the cylinder (103e), the limit plate (103f) is movably matched with the check plate (103b), and a drainage groove (103g) is provided on the end surface of the limit plate (103f).

8. The oil pressure cylinder according to claim 6, characterized in that: A mounting frame (103i) is arranged inside the expansion tube (103a), the mounting frame (103i) is fixedly connected to the cylinder (103e), and a spring (103h) is arranged between the mounting frame (103i) and the check plate (103b).

9. A turbine governor oil pressure device, characterized in that: The oil pressure cylinder comprises any one of claims 1 to 8; and The energy-saving component (200) comprises a water reservoir (201) connected to the first access pipe (102a), an oil return tank (202) connected to the oil pressure cylinder (102), and an oil pump (203) disposed between the oil return tank (202) and the oil pressure cylinder (102).

10. The oil pressure device for a turbine speed governor according to claim 9, characterized in that: The oil pump (203) is connected to a pressure sensor (204), and the oil return tank (202) is connected to the oil pressure cylinder (102). A hydraulic motor (205) is also provided between the two parts, and a hydraulic pump (207) is connected to the hydraulic motor (205). One end of the hydraulic pump (207) is connected to a pressure regulating valve (206).

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