CN215448130U

CN215448130U - Power plant high-low pressure heater liquid level switch calibration equipment

Info

Publication number: CN215448130U
Application number: CN202121187043.7U
Authority: CN
Inventors: 商亮; 付秋实; 朱立舒
Original assignee: Datang Changchun No3 Thermal Power Plant
Current assignee: Datang Changchun No3 Thermal Power Plant
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-01-07
Anticipated expiration: 2031-05-28

Abstract

The utility model discloses a checking device for a liquid level switch of a high-low pressure heater of a power plant, wherein the high-low pressure heater of the thermal power plant is an important auxiliary machine of a steam turbine, the liquid level switch is an important guarantee for preventing the safety operation of the steam turbine from being endangered by the overhigh water level of the heater, in order to ensure the measuring accuracy of the liquid level switch, the high-low liquid level switch is periodically calibrated during the overhaul or the standby of a unit, the switch position is adjusted through measurement to ensure that the fixed value of the liquid level switch is within an allowable error range, water is reversely poured through a water pipe, the water level value is compared with a local magnetic turning plate water level meter after the switch is operated, the operating water level value is recorded and compared with a design value, and the large error problem of the movement measurement of the water pipe can be solved, the water filling and the draining can be repeatedly checked through the checking device adopting the communicating pipe principles such as the pre-comparison of a liquid level measuring scale, the coarse fine-fine adjustment control and the like, so as to ensure the accuracy of the checking process.

Description

Power plant high-low pressure heater liquid level switch calibration equipment

Technical Field

The utility model relates to the field of equipment calibration, in particular to a calibration device for a liquid level switch of a high-low pressure heater of a power plant.

Background

During the maintenance period is stopped at every turn in thermal power factory, all can inspect the important protection level switch of the important auxiliary engine high-low pressure heater of steam turbine, wherein the calibration of high low heater level switch is a very important work, the switch calibration process is that the water pipe carries out reverse irrigation through the blowdown door of opening, the water pipe equals the liquid level with switch measuring device, treat behind the switch action and contrast with magnetism turnover plate fluviograph on the spot, record action water level value, and compare with the design value, if the deviation of action water level value is great from the design value, need carry out certain extent regulation to the switch height, but in the calibration process, because the water pipe removes, the water injection water velocity is inhomogeneous, there are factors such as bubble in the water pipe to influence and can produce great measuring error.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the utility model provides a calibration device for a liquid level switch of a high-pressure and low-pressure heater in a power plant.

In order to achieve the purpose, the utility model is realized by the following technical scheme: a calibration device for a liquid level switch of a high-low pressure heater in a power plant is structurally provided with a water storage device, a connecting joint, a coarse adjustment valve, a fine adjustment valve, a measuring water pipe, a device bracket, a graduated scale, a fixing clamp, a three-way pipeline, an external water pipe and a drainage valve.

The measuring device comprises a water storage device, a coarse adjusting valve, a fine adjusting valve, connecting joints, measuring water pipes, a measuring pipe and a measuring pipe, wherein the connecting joints are fixedly connected below the water storage device, the coarse adjusting valve and the fine adjusting valve are mutually connected in a penetrating and movable fit mode, the measuring water pipes are located below the water storage device, the lower ends of the connecting joints are embedded in the upper end of the inner portion of the measuring water pipes and are arranged in a penetrating mode, the number of the water storage devices is three, the sizes of inner spaces of the water storage devices are different, the connecting joints are arranged in two positions and are symmetrically arranged relative to the center, the coarse adjusting valve and the fine adjusting valve are in a group and are matched and movable, the number of the measuring water pipes is two, the measuring water pipes are of a columnar pipe structure, the inner portion of the measuring pipe structure is in a hollow state, the flow rate of the coarse adjusting valve is thirty-three milliliters per second, and the flow rate of the fine adjusting valve is twenty-two milliliters per second.

Furthermore, the device support is embedded into the middle end of the inner portion of the measuring water pipe and penetrates through the middle end of the inner portion of the measuring water pipe, the graduated scale is fixedly embedded on the outer side of the measuring water pipe, the fixing clamp is movably clamped with the graduated scale, the device support is in a triangular support shape, and numerical values are arranged on the graduated scale.

Furthermore, the three-way pipeline is connected to the bottom end of the measuring water pipe and is communicated with the bottom end of the measuring water pipe, one side end of the external water pipe is communicated with the three-way pipeline, the drainage valve is installed at the lower position of one side of the three-way pipeline and is communicated with the other end of the three-way pipeline, the three-way pipeline is located in the water storage device at the lower position, the external water pipe is embedded into the side end of the water storage device at the lower position, and the upper end, the left end and the right end of the three-way pipeline are both of through structures.

Advantageous effects

Compared with the prior art, the utility model has the following beneficial effects:

the utility model adopts the adjustable liquid level measuring scale to compare with the local magnetic turning plate water level gauge in advance, adjusts the water injection and drainage quantity through the coarse adjustment control valve, the fine adjustment control valve and the drainage valve, shortens the calibration distance of the device through the coarse adjustment and fine adjustment valve control, greatly reduces the measurement error caused by the movement of the water pipe and the like, carries out the calibration of the liquid level switch by utilizing the principle of the equivalent water level of the communicating pipe, can solve the problem of large measurement error of the movement of the water pipe, and can carry out the repeated inspection of water injection and drainage so as to ensure the accuracy of the calibration process.

Drawings

Fig. 1 is a schematic structural diagram of a power plant high-low pressure heater liquid level switch calibration device of the present invention.

FIG. 2 is a schematic view of the internal cross-sectional structure of the calibration device for the liquid level switch of the high-low pressure heater in the power plant

In the figure: the device comprises a water storage device-1, a connecting joint-2, a coarse adjustment valve-3, a fine adjustment valve-4, a measuring water pipe-5, a device bracket-6, a graduated scale-7, a fixing clamp-8, a three-way pipeline-9, an external water pipe-10 and a drainage valve-11.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

As shown in fig. 1-2, the utility model provides a calibration device for a liquid level switch of a high-low pressure heater in a power plant, which is structurally provided with a water storage device 1, a connecting joint 2, a coarse adjustment valve 3, a fine adjustment valve 4, a measuring water pipe 5, a device bracket 6, a graduated scale 7, a fixing clamp 8, a three-way pipeline 9, an external water pipe 10 and a drainage valve 11.

The connecting joint 2 is fixedly connected below the water storage device 1, the coarse adjustment valve 3 and the fine adjustment valve 4 are mutually connected in a penetrating and movable fit mode, the measuring water pipes 5 are positioned below the water storage device 1, the lower end of the connecting joint 2 is embedded in the upper end position inside the measuring water pipe 5 and is arranged in a penetrating mode, the water storage device 1 is provided with three water storage devices, the sizes of the inner spaces of the water storage devices are different, the connecting joint 2 is provided with two positions and is symmetrically arranged relative to the center, the coarse adjustment valve 3 and the fine adjustment valve 4 are combined and movable into one group and are provided with two groups, the measuring water pipe 5 is of a columnar pipe structure, the inner part of the measuring water pipe is in a hollow state, the flow rate of the coarse adjustment valve 3 is thirty-three milliliters per second, the flow rate of the fine adjustment valve 4 is twenty-two milliliters per second, the water injection and drainage amounts in the measuring water pipe 5 are adjusted, the device support 6 is embedded in the middle end inside the measuring water pipe 5, the graduated scale 7 is fixedly embedded outside the measuring water pipe 5, the fixing clip 8 is movably clamped with the graduated scale 7, the device bracket 6 is in a triangular bracket shape, the graduated scale 7 is provided with numerical values, the graduated scale 7 and the fixing clip 8 are matched with each other to assist the calibration of the water quantity of the whole equipment, the three-way pipeline 9 is connected with and communicated with the bottom end of the measuring water pipe 5, one side end of the external water pipe 10 is communicated with the three-way pipeline 9, the drainage valve 11 is arranged at the lower position of one side of the three-way pipeline 9 and is communicated with the other end of the three-way pipeline 9, the three-way pipeline 9 is positioned in the water storage device 1 at the lower position, the external water pipe 10 is embedded in the side end of the water storage device 1 at the lower position, the upper end, the left end and the right end of the three-way pipeline 9 are both of through port structures, and the three-way pipeline 9, the external water pipe 10 and the drainage valve 11 are mutually matched to control water injection and drainage.

The working principle of the present invention is explained as follows: the calibration device is placed near a local magnetic turnover plate of the high-low pressure heater, the zero position of the graduated scale is aligned with the zero position of a scale of the magnetic turnover plate by adjusting the up-down position of the graduated scale 7, then the fixing clip 8 is locked to fix the position of the graduated scale, the water level value of the suspended magnetic switch action of the high-low pressure heater can be rapidly measured, the device is moved to the position near a liquid level switch, the valve coarse adjustment valve 3 and the fine adjustment valve 4 are closed, the water storage device 1 is filled with water, the primary door at the negative pressure side of the liquid level switch is closed, the sewage discharge door is opened, the external water pipe 10 is connected to the water discharge port below the sewage discharge door and locked, the valve drainage valve 11 is closed, the valve coarse adjustment valve 3 is opened, the U-shaped pipeline is filled with water, when the switch is about to act, the valve coarse adjustment valve 3 is closed, the valve fine adjustment valve 4 is opened, the valve fine adjustment valve 4 is rapidly closed during the switch action, the control is realized through the coarse adjustment and the fine adjustment valve, shorten device calibration distance, the great degree reduces the measuring error that water pipe removed etc. brought, through the valve operation, can measure repeatedly, the degree of accuracy is high, reproducibility is good, read out the water injection height of measuring water pipe 5 this moment on scale 7, and the record, open valve drainage valve 11, close drainage valve 11 after emitting a little water, measure the switch action value again, after the experiment, open valve drainage valve 11, pour into water storage device 1 after putting into the container with U-shaped pipeline water, carry out next switch calibration.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a high low pressure heater liquid level switch calibration equipment in power plant, its structure is equipped with water storage device (1), attach fitting (2), coarse adjusting valve (3), fine adjusting valve (4), measures water pipe (5), device support (6), scale (7), fixing clip (8), tee bend pipeline (9), external water pipe (10), drain valve (11), its characterized in that:

the water storage device is characterized in that the connecting joint (2) is fixedly connected below the water storage device (1), the coarse adjusting valve (3) and the fine adjusting valve (4) are mutually connected in a penetrating manner and are movably matched, the measuring water pipe (5) is positioned below the water storage device (1), and the lower end of the connecting joint (2) is embedded in the measuring water pipe (5) and is arranged at the upper end in a penetrating manner.

2. The power plant high and low pressure heater liquid level switch calibration device of claim 1, wherein: the device is characterized in that a support (6) is embedded into the middle end of the inner part of the measuring water pipe (5), the graduated scale (7) is fixedly installed on the outer side of the measuring water pipe (5), and the fixing clamp (8) is movably clamped with the graduated scale (7).

3. The power plant high and low pressure heater liquid level switch calibration device of claim 1, wherein: the water storage device is characterized in that the three-way pipeline (9) is connected to the bottom end of the measuring water pipe (5) and communicated with the bottom end of the measuring water pipe, one side end of the external water pipe (10) is communicated with the three-way pipeline (9), the water discharge valve (11) is installed at the position below one side of the three-way pipeline (9) and communicated with the other end of the three-way pipeline (9), the three-way pipeline (9) is located in the water storage device (1) at the position below, and the external water pipe (10) is embedded into the side end of the water storage device (1) at the position below.