Direct-current oil pump start-stop control structure for steam turbine

Abstract

The utility model discloses a direct current oil pump start-stop control structure for a steam turbine, which relates to the technical field of oil pump start-stop control, and comprises a control base, an evacuation mechanism is arranged at the upper end of the control base, and the evacuation mechanism comprises a suction assembly which is arranged at the upper end of the control base and comprises two groups of fixing frames fixedly arranged at the upper end of the control base; suction cylinders are fixedly connected to one sides of the two sets of fixing frames, pistons are slidably mounted on the inner walls of the suction cylinders, push-extension rods are fixedly connected to the upper ends of the pistons, pull rods are fixedly connected to the top ends of the push-extension rods, external threaded pipes are connected to the lower ends of the suction cylinders in an intercommunication mode, and threaded sleeves are connected to the outer walls of the external threaded pipes in a threaded mode. The ventilation assembly is arranged on the inner side of the suction assembly, and the problems that gas still exists in a gap between a protection box of an existing start-stop control structure for the oil pump and a control device body, the gas possibly has high humidity, and once the humidity exceeds a certain threshold value, an electric control element is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pump start-stop control, in particular to a DC oil pump start-stop control structure for a steam turbine. Background Art

[0002] In the power industry, steam turbines are a key power equipment widely used in various large power plants and industrial fields. The stable operation of steam turbines is crucial to the reliability and safety of the entire power system. Among them, the bearing lubrication system of the steam turbine is a key part to ensure the normal operation of the steam turbine, and the DC oil pump is an important part of the bearing lubrication system. The performance of its start-stop control structure is directly related to the operation of the steam turbine. The traditional steam turbine DC oil pump start-stop control structure mainly relies on the distributed control system (DCS) for electrical control. Under normal operating conditions, the DC oil pump is set to the automatic mode. When the lubricating oil pressure of the steam turbine is lower than the preset threshold, the DC oil pump will automatically start to operate to provide the necessary lubrication for the bearing; when the lubricating oil pressure is higher than another preset threshold, the DC oil pump will automatically stop running. This control method realizes the automatic management of the DC oil pump to a certain extent and improves the operation efficiency of the steam turbine.

[0003] In the prior art, for example, the patent with publication number CN210807115U discloses a microcomputer DC oil pump motor starting control device, which is easy to operate and has a simple structure by adding a transparent protective box locking device on the front surface of the main body. It effectively avoids the improper starting and stopping of the motor due to accidentally touching the switch, thereby damaging the key components of the motor, greatly reducing the service life of the motor, increasing economic costs, and reducing work efficiency.

[0004] Although the above patent can effectively prevent relevant personnel from touching the switch, resulting in irregular start and stop of the oil pump, there is still gas in the gap between the protection box of the start and stop control structure of the oil pump and the main body of the control device, and the gas may have a high humidity. Once the humidity exceeds a certain threshold, it will affect the electronic control components, causing changes in control accuracy and even reducing the overall service life of the device. For this reason, the utility model provides a DC oil pump start and stop control structure for a steam turbine. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a start-stop control structure for a DC oil pump for a steam turbine, which solves the problem that in the previous start-stop control structure for the oil pump, there is still gas in the gap between the protection box and the control device body, and the gas may have a high humidity, which will affect the electronic control components once the humidity exceeds a certain threshold.

[0006] To achieve the above purpose, the utility model is implemented by the following technical solutions: a DC oil pump start-stop control structure for a steam turbine includes a control base, an upper end of the control base is provided with an evacuation mechanism, and the evacuation mechanism includes:

[0007] A suction assembly is arranged at the upper end of the control base, and includes two sets of fixing frames fixedly installed at the upper end of the base, one side of each set of the fixing frames is fixedly connected with a suction cylinder, a piston is slidably installed on the inner wall of the suction cylinder, a push rod is fixedly connected to the upper end of the piston, a pull rod is fixedly connected to the top end of the push rod, an external threaded pipe is interconnected at the lower end of the suction cylinder, and a threaded sleeve is threadedly connected to the outer wall of the external threaded pipe;

[0008] The ventilation component is arranged inside the suction component and is used to control the gas flow inside and outside the suction cylinder.

[0009] Preferably, the lower end of the piston is connected to a connecting line, and the end of the connecting line is connected to a sealing block.

[0010] Preferably, the ventilation assembly comprises a conducting pipe which is interconnected and installed between the two groups of suction cylinders, and a pipe plug is connected to a central pipe opening of the conducting pipe.

[0011] Preferably, a protective cover is movably hinged on one side of the front end of the control base, and is used to provide closed protection for the front end of the control base.

[0012] Preferably, a switch button is provided on the front end surface of the control base, and is used to control the start and stop operation of the DC oil pump.

[0013] Preferably, a positioning hole for the threaded sleeve to be inserted and plugged is provided on the upper surface of the protective cover, so that the threaded sleeve can be connected to the protective cover after being screwed down.

[0014] Beneficial Effects

[0015] The utility model provides a start-stop control structure for a DC oil pump for a steam turbine. Compared with the prior art, it has the following beneficial effects:

[0016] (1) The start-stop control structure of the DC oil pump used in the steam turbine drives the push rod and the piston to slide up along the inner wall of the suction cylinder by pulling up the pull rod, thereby sucking the gas between the control machine base and the protective cover into the interior of the suction cylinder. At the same time, the connecting line drives the sealing block to be pulled up until the sealing block is stuck in the pipe mouth of the threaded sleeve and seals it, thereby separating the inner cavity of the suction cylinder and the inner cavity of the protective cover, effectively reducing the gas content between the control machine base and the protective cover, and creating a vacuum-like environment.

[0017] (2) The start-stop control structure of the DC oil pump used in the steam turbine is implemented by closing the protective cover and then rotating the threaded sleeve at the lower part of the external threaded pipe so that it can be connected with the positioning socket on the protective cover, and the protective cover is limited and fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the protective cover of the utility model being opened;

[0020] Figure 3 This is a schematic diagram of the structure of the vacuum mechanism of the utility model;

[0021] Figure 4 It is a schematic diagram of the disassembly of the vacuum mechanism of the utility model.

[0022] In the figure: 1-control base, 2-vacuum mechanism, 21-suction assembly, 211-fixed frame, 212-suction cylinder, 213-pushing rod, 214-piston, 215-external threaded pipe, 216-threaded sleeve, 217-connecting line, 218-sealing block, 219-pull rod, 22-ventilation assembly, 221-conducting pipe, 222-pipe plug, 3-protective cover, 4-switch button, 5-positioning socket. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4 The utility model provides a technical solution: a DC oil pump start-stop control structure for a steam turbine, comprising a control base 1, a vacuum mechanism 2 is arranged on the upper end of the control base 1, and the vacuum mechanism 2 includes:

[0025] The suction assembly 21 is arranged at the upper end of the control base 1, and includes two sets of fixing frames 211 fixedly installed at the upper end of the base 1. One side of the two sets of fixing frames 211 is fixedly connected with a suction cylinder 212. A piston 214 is slidably installed on the inner wall of the suction cylinder 212. A push rod 213 is fixedly connected to the upper end of the piston 214. A pull rod 219 is fixedly connected to the top of the push rod 213. An external threaded pipe 215 is interconnected at the lower end of the suction cylinder 212. A threaded sleeve 216 is threadedly connected to the outer wall of the external threaded pipe 215.

[0026] The ventilation component 22 is disposed inside the suction component 21 and is used to control the flow of gas inside and outside the suction cylinder 212 .

[0027] In this embodiment, the lower end of the piston 214 is connected to a connecting line 217, and the end of the connecting line 217 is connected to a sealing block 218. The pull rod 219 is pulled up to drive the pushing rod 213 and the piston 214 to slide up along the inner wall of the suction cylinder 212, thereby controlling the gas between the machine base 1 and the protective cover 3 to be sucked into the interior of the suction cylinder 212. At the same time, the connecting line 217 drives the sealing block 218 to be pulled up until the sealing block 218 is stuck in the pipe mouth of the threaded sleeve 216 and seals it.

[0028] In this embodiment, the ventilation assembly 22 includes a connecting pipe 221 installed between two groups of suction cylinders 212. The central pipe opening of the connecting pipe 221 is plugged with a pipe plug 222. By opening the pipe plug 222, the gas inside and outside the suction cylinder 212 can communicate with each other.

[0029] In this embodiment, a protective cover 3 is movably hinged on one side of the front end of the control base 1 and is used to seal and protect the front end of the control base 1 .

[0030] In this embodiment, a switch button 4 is provided on the front end surface of the control base 1 and is used to control the start and stop operation of the DC oil pump.

[0031] In this embodiment, a positioning insertion hole 5 for inserting and plugging the threaded sleeve 216 is provided on the upper surface of the protective cover 3 , so that the threaded sleeve 216 can be connected to the protective cover 3 after being screwed down.

[0032] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0033] During operation, by pressing the switch button 4 on the control base 1, the control base 1 is controlled and connected with the DC oil pump for the steam turbine, thereby controlling the start and stop of the DC oil pump. After use, the protective cover 3 is closed, and then the threaded sleeve 216 at the lower part of the external threaded tube 215 is rotated to connect it with the positioning socket 5 on the protective cover 3, and the protective cover 3 is limited and fixed, and the pull rod 219 is pulled up to drive the push rod 213 and the piston 214 to slide up along the inner wall of the suction cylinder 212, so that the gas between the control base 1 and the protective cover 3 is sucked into the suction cylinder 212. At the same time, the connecting line 217 drives the sealing block 218 to be pulled up until the sealing block 218 is stuck in the pipe mouth of the threaded sleeve 216 and blocks it, thereby separating the inner cavity of the suction cylinder 212 and the inner cavity of the protective cover 3, effectively reducing the gas content between the control base 1 and the protective cover 3, and creating a vacuum-like environment.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A start-stop control structure for a DC oil pump for a steam turbine, comprising a control base (1), characterized in that: The upper end of the control base (1) is provided with a vacuum mechanism (2), and the vacuum mechanism (2) comprises: A suction assembly (21) is arranged at the upper end of the control base (1), and comprises two groups of fixing frames (211) fixedly mounted on the upper end of the base (1), one side of each of the two groups of fixing frames (211) being fixedly connected to a suction cylinder (212), a piston (214) being slidably mounted on the inner wall of the suction cylinder (212), an extension rod (213) being fixedly connected to the upper end of the piston (214), a pull rod (219) being fixedly connected to the top end of the extension rod (213), an externally threaded tube (215) being interconnected at the lower end of the suction cylinder (212), and a threaded sleeve (216) being threadedly connected to the outer wall of the externally threaded tube (215); The ventilation component (22) is arranged inside the suction component (21) and is used to control the flow of gas inside and outside the suction cylinder (212).

2. The start-stop control structure of a DC oil pump for a steam turbine according to claim 1, characterized in that: The lower end of the piston (214) is connected to a connecting line (217), and the end of the connecting line (217) is connected to a sealing block (218).

3. The start-stop control structure of a DC oil pump for a steam turbine according to claim 1, characterized in that: The ventilation assembly (22) comprises a connecting pipe (221) which is installed between two groups of suction cylinders (212) and communicates with each other. A pipe plug (222) is connected to the central pipe opening of the connecting pipe (221).

4. The start-stop control structure of a DC oil pump for a steam turbine according to claim 1, characterized in that: A protective cover (3) is movably hinged on one side of the front end of the control base (1) and is used to seal and protect the front end of the control base (1).

5. The start-stop control structure of a DC oil pump for a steam turbine according to claim 1, characterized in that: The front end surface of the control base (1) is provided with a switch button (4) for controlling the start and stop operation of the DC oil pump.

6. The start-stop control structure of a DC oil pump for a steam turbine according to claim 4, characterized in that: The upper surface of the protective cover (3) is provided with a positioning insertion hole (5) for the threaded sleeve (216) to be inserted and plugged in, so that the threaded sleeve (216) can be butted and connected with the protective cover (3) after being screwed down.

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