Device for action test of large-shaft gulp valve

Abstract

The utility model relates to the technical field of large-shaft gulp valves, and provides a device for a large-shaft gulp valve action test, which is used in cooperation with a large-shaft gulp valve and comprises a door-shaped fixing frame arranged on the large-shaft gulp valve and connected with a shell bolt of the large-shaft gulp valve; the first end of the hydraulic jack is in contact with the door-shaped fixing frame, and the second end of the hydraulic jack is in contact with a valve element of the large shaft gulp valve; the pressure supply assembly comprises a tee joint and a hydraulic pump, a first connector of the tee joint is communicated with a hydraulic cavity in the hydraulic jack through an oil pipe, a pressure gauge is fixedly installed at a second connector of the tee joint, and a third connector of the tee joint is communicated with a liquid outlet of the hydraulic pump. The utility model solves the problems of incapability of quantizing data, complex experiment process and potential safety hazard in the action test process, improves the working efficiency, enhances the working safety guarantee and saves the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of large shaft air supply valves, in particular to a device for a large shaft air supply valve action test. Background Art

[0002] In order to ensure stable operation of the turbine under partial load conditions, an air supply system is generally provided to supply natural air to the bottom of the runner through the top of the upper shaft of the generator. The air supply system consists of an air inlet pipe, an air supply valve, an air supply pipe, a check valve, a muffler, etc. Its working principle is as follows: Under normal operation of the unit, the air supply valve is in a normally closed state. When the unit is in non-optimal working condition, as the vacuum degree of the tailwater pipe increases, the valve disc of the air supply valve overcomes the elastic force of the spring in the valve core under the action of the pressure difference, and the valve disc opens to supply natural air to the tailwater pipe of the unit. After the air supply is completed, the valve disc closes under the action of the spring elastic force; during the entire operation process, the air supply valve rotates with the main shaft.

[0003] At present, in the actual maintenance process of the main shaft air supply valve in large hydropower stations, tools such as pullers are usually used for action test inspection, or heavy objects such as iron blocks of different weights are placed on the main shaft air supply valve stem for action test inspection. As a result, the action test process is more complicated, the test data is not accurate, and it takes a long time, which is time-consuming and labor-intensive.

[0004] The action test inspection is carried out by using tools such as pull codes. This method cannot quantify the test data. It is also necessary to use heavy objects such as iron blocks of different weights to place on the main shaft air supply valve stem for action test inspection. This method has a relatively complicated experimental process and has safety hazards (the iron block required for the opening pressure of the main shaft air supply valve is at least 200-300 kilograms, and the iron block required for full opening is heavier), which is time-consuming and labor-intensive. Therefore, the existing technology has problems such as the inability to quantify data during the main shaft air supply valve action test, the complicated test process, the safety hazards, and the time-consuming and labor-intensive process.

[0005] The Chinese utility model patent with the authorization announcement number CN 207556818 U discloses a device for checking the operation of a large shaft air supply valve of a water turbine. The utility model is a device for checking the operation of a large shaft air supply valve of a water turbine, comprising a bracket, a push rod motor, a thrust meter and a control box. The push rod of the push rod motor is provided with a scale, and the bracket is provided with bolt holes for fixing the large shaft air supply valve and the push rod motor. The push rod motor is fixed to the bracket by bolts, and the free end of the push rod of the push rod motor is connected to the thrust meter. The probe of the thrust meter faces the direction in which the push rod of the push rod motor is pushed, and the push rod motor and the thrust meter are electrically connected to the control box respectively. The utility model is a special inspection device for the three key indicators of the opening force, the full opening force and the full opening formation of the large shaft air supply valve of the water turbine, which can better assist in the maintenance of the water turbine generator and improve the efficiency and quality of the maintenance work. This utility model improves work efficiency and quantifies experimental data, but the production of this utility model is relatively complicated and the cost is relatively high (the push rod motor, control box, thrust meter, probe, etc. need to be purchased). Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a device for testing the action of a large shaft air supply valve, so as to solve the problems of being unable to quantify data, complicated experimental process and potential safety hazards during the test of the action of the large shaft air supply valve, improve work efficiency, increase work safety and save costs.

[0007] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions: a device for a large shaft air supply valve action test, used in conjunction with the large shaft air supply valve, comprising:

[0008] A door-type fixing frame, the door-type fixing frame is arranged on the main shaft air supply valve and is connected with the outer shell bolts of the main shaft air supply valve;

[0009] A hydraulic jack, wherein a first end of the hydraulic jack is in contact with the door-type fixing frame, and a second end of the hydraulic jack is in contact with a valve core of the main shaft air supply valve;

[0010] A pressure supply component, the pressure supply component includes a tee and a hydraulic pump, the first interface of the tee is connected to the hydraulic chamber in the hydraulic jack through an oil pipe, a pressure gauge is fixedly installed at the second interface of the tee, and the third interface of the tee is connected to the liquid outlet of the hydraulic pump.

[0011] Furthermore, it also includes an auxiliary support component, which includes a steel pipe and a flange blind plate. The steel pipe is fixedly installed on the flange blind plate, the steel pipe contacts the valve core of the large shaft air supply valve, and the flange blind plate contacts the second end of the hydraulic jack.

[0012] Furthermore, a fully open scale mark line of the main shaft air supply valve is provided on the piston rod of the hydraulic jack.

[0013] Furthermore, the door-shaped fixing frame includes two first channel steels, which are arranged in parallel, and the tops of the two first channel steels are fixedly connected by a second channel steel, and the bottoms of the two first channel steels are fixedly installed with steel plates, and the steel plates are provided with through holes.

[0014] Furthermore, a rib plate is provided between the first channel steel and the second channel steel, and two ends of the rib plate are fixedly connected to the first channel steel and the second channel steel respectively.

[0015] Furthermore, the hydraulic jack is of a manually detachable type.

[0016] Beneficial effects of the utility model: The utility model provides a device for the action test of the large shaft air supply valve. When in use, the staff only needs to make a door-shaped fixing frame, and the rest are all made with on-site tools. Substituting the pressure value measured by the pressure gauge into the calculation formula, accurate data of the action test can be obtained, which simplifies the action test process, improves the on-site turnover rate of the equipment, and increases work safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model when in use;

[0018] Figure 2 This is a front view structural schematic diagram of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the auxiliary support assembly.

[0020] Figure numbers: 10-main shaft air supply valve, 11-housing, 12-valve core, 20-door-type fixing frame, 21-first channel steel, 22-second channel steel, 23-steel plate, 24-rib plate, 30-hydraulic jack, 40-pressure supply assembly, 41-tee, 42-hydraulic pump, 43-oil pipe, 44-pressure gauge, 50-auxiliary support assembly, 51-steel pipe, 52-flange blind plate, 60-collector ring cover. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] In this application, unless otherwise clearly specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0023] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "up", "down", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0025] like Figure 1-Figure 3 As shown, the utility model provides a device for a large shaft air supply valve action test, which is used in conjunction with a large shaft air supply valve 10. The large shaft air supply valve 10 is a prior art, and the specific structure is not repeated here. The device includes a door-type fixing frame 20, a hydraulic jack 30 and a pressure supply assembly 40.

[0026] The door-type fixing bracket 20 is disposed on the air supply valve 10 and is bolted to the housing 11 of the air supply valve 10 .

[0027] The hydraulic jack 30 is disposed in the longitudinal direction, a first end of the hydraulic jack 30 contacts the door-type fixing frame 20 , and a second end of the hydraulic jack 30 contacts the valve core 12 of the air supply valve 10 .

[0028] The pressure supply assembly 40 includes a tee 41 and a hydraulic pump 42. The first interface of the tee 41 is connected to the hydraulic chamber in the hydraulic jack 30 through an oil pipe 43, a pressure gauge 44 is fixedly installed at the second interface of the tee 41, and the third interface of the tee 41 is connected to the liquid outlet of the hydraulic pump 42. Preferably, the hydraulic pump 42 can be placed on the collector ring 60 to facilitate the operation of the staff.

[0029] Before using the device, the staff adjusts the hydraulic jack 30 according to the full opening stroke of the main shaft air supply valve 10, and then calculates the pressure according to the pressure calculation formula. [Wherein, F is the force applied to the main shaft air supply valve 10, in N; P is the working pressure, i.e. the reading of the pressure gauge 44, in MPa or Pa; D is the diameter of the cylinder piston of the hydraulic jack 30 (actual effective force-bearing area), in mm or m], and the force required to open and fully open the main shaft air supply valve 10 is calculated to determine whether it meets the design standard.

[0030] When the main shaft air supply valve 10 needs to be tested for action, the door-type fixing frame 20 is bolted to the housing 11 of the main shaft air supply valve 10 to play a fixed supporting role. Then the hydraulic jack 30 is placed between the door-type fixing frame 20 and the valve core 12 of the air supply valve 10, and pressure is applied to make it bear force. Then the hydraulic pump 42 slowly pressurizes until the air supply valve 10 is opened and fully opened, and the pressure gauge 44 reading and the full opening distance are read and recorded and calculated. The opening force and the full opening force of the main shaft air supply valve 10 are calculated, and then the opening force and the full opening force are checked to see if they meet the technical standards. If not, the locking nut and the spring of the air supply valve 10 should be adjusted, otherwise, they should not be used.

[0031] When using the device, the staff only needs to make a door-shaped fixing frame 20, and the rest are all done with on-site tools. Substituting the pressure value measured by the pressure gauge 44 into the calculation formula, accurate data of the action test can be obtained, which simplifies the action test process, improves the on-site turnover rate of the equipment, and increases the safety of work.

[0032] In one embodiment, an auxiliary support assembly 50 is also included. The auxiliary support assembly 50 includes a steel pipe 51 and a flange blind plate 52. The steel pipe 51 is fixedly mounted on the flange blind plate 52. The steel pipe 51 contacts the valve core 12 of the air supply valve 10, and the flange blind plate 52 contacts the second end of the hydraulic jack 30.

[0033] The auxiliary support assembly 50 is used to support the hydraulic jack 30 and plays a role in protecting the valve core 12 of the air supply valve 10 .

[0034] In one embodiment, a fully open scale mark line of the air supply valve 10 is provided on the piston rod of the hydraulic jack 30 to facilitate better identification by the staff.

[0035] In one embodiment, the door-type fixing frame 20 includes two first channel steels 21, which are arranged in parallel. The tops of the two first channel steels 21 are fixedly connected by a second channel steel 22, and the bottoms of the two first channel steels 21 are fixedly installed with steel plates 23, and the steel plates 23 have through holes.

[0036] The channel steel and the steel plate 23 are easy to find on site, which can better save costs.

[0037] In one embodiment, a rib plate 24 is disposed between the first channel steel 21 and the second channel steel 22, and two ends of the rib plate 24 are fixedly connected to the first channel steel 21 and the second channel steel 22, respectively, so as to strengthen the force of the fixing frame 20 and prevent the fixing frame 20 from being deformed.

[0038] In one embodiment, the hydraulic jack 30 is a manually disengageable type.

[0039] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for a main shaft air supply valve action test, used in conjunction with the main shaft air supply valve, characterized in that: include: A door-type fixing frame, the door-type fixing frame is arranged on the main shaft air supply valve and is connected with the outer shell bolts of the main shaft air supply valve; A hydraulic jack, wherein a first end of the hydraulic jack is in contact with the door-type fixing frame, and a second end of the hydraulic jack is in contact with a valve core of the main shaft air supply valve; A pressure supply component, the pressure supply component includes a tee and a hydraulic pump, the first interface of the tee is connected to the hydraulic chamber in the hydraulic jack through an oil pipe, a pressure gauge is fixedly installed at the second interface of the tee, and the third interface of the tee is connected to the liquid outlet of the hydraulic pump.

2. The device for testing the action of a large shaft air supply valve according to claim 1, characterized in that: It also includes an auxiliary support assembly, which includes a steel pipe and a flange blind plate. The steel pipe is fixedly mounted on the flange blind plate. The steel pipe contacts the valve core of the main shaft air supply valve, and the flange blind plate contacts the second end of the hydraulic jack.

3. The device for testing the action of a large shaft air supply valve according to claim 1, characterized in that: The piston rod of the hydraulic jack is provided with a full-open scale mark line of the main shaft air supply valve.

4. The device for testing the action of a large shaft air supply valve according to claim 1, characterized in that: The door-shaped fixing frame includes two first channel steels, which are arranged in parallel. The tops of the two first channel steels are fixedly connected by a second channel steel. The bottoms of the two first channel steels are fixedly installed with steel plates, and the steel plates are provided with through holes.

5. The device for testing the action of a large shaft air supply valve according to claim 4, characterized in that: A rib plate is arranged between the first channel steel and the second channel steel, and two ends of the rib plate are fixedly connected to the first channel steel and the second channel steel respectively.

6. The device for testing the action of a large shaft air supply valve according to claim 1, characterized in that: The hydraulic jack is of manual separation type.

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