阅读说明：本技术 背压汽轮机油站控制装置 (Backpressure steam turbine oil station control device ) 是由 杨德志 卜玉忠 宋昌勇 程木强 陈春 陈培举 王春和 孙承志 于 2020-08-15 设计创作，主要内容包括：本发明公开了背压汽轮机油站控制装置,其包括：供电电路、保护电路以及控制电路；供电电路包括电源切换电路、若干电源支路、电控柜控制电源电路以及直流油泵电源电路；电源切换电路与电控柜控制电源电路连接,各电源支路一端电连接所述电源切换电路输出端,另一端分别连接背压汽轮机组内的各器件,电控柜控制电源电路与UPS设备电连接,直流油泵电源电路一端与直流电源端电连接,另一端连接直流油泵；保护电路包括第一油泵保护器、第二油泵保护器以及盘车电机保护器；控制电路包括本地/远程控制器。本发明具有改造结构简单易于操作、控制电路布局合理等优点,有效保证了设备的可靠的运行。(The invention discloses a back pressure turbine oil station control device, which comprises: the protection circuit comprises a power supply circuit, a protection circuit and a control circuit; the power supply circuit comprises a power supply switching circuit, a plurality of power supply branches, an electric control cabinet control power supply circuit and a direct-current oil pump power supply circuit; the power supply switching circuit is connected with the control power supply circuit of the electric control cabinet, one end of each power supply branch circuit is electrically connected with the output end of the power supply switching circuit, the other end of each power supply branch circuit is respectively connected with each device in the backpressure turbine set, the control power supply circuit of the electric control cabinet is electrically connected with the UPS equipment, one end of the power supply circuit of the direct-current oil pump is electrically connected with the direct-current power supply end, and the other end of the; the protection circuit comprises a first oil pump protector, a second oil pump protector and a turning motor protector; the control circuit includes a local/remote controller. The invention has the advantages of simple improved structure, easy operation, reasonable control circuit layout and the like, and effectively ensures the reliable operation of equipment.)

1. Backpressure steam turbine oil station controlling means, its characterized in that includes: the protection circuit comprises a power supply circuit, a protection circuit and a control circuit; the power supply circuit comprises a power supply switching circuit, a plurality of power supply branches, an electric control cabinet control power supply circuit and a direct-current oil pump power supply circuit; the power supply switching circuit is connected with a control power supply circuit of an electric control cabinet, one end of each power supply branch is electrically connected with the output end of the power supply switching circuit, the other end of each power supply branch is respectively connected with each device in the backpressure steam turbine set, the devices at least comprise a first oil pump motor, a second oil pump motor, an electric heater, an oil smoke exhaust fan, a barring motor, a shaft seal cooler, a regulating valve power oil pump, a first regulating valve regulating oil pump, a second regulating valve regulating oil pump and a quick-closing valve oil pump, the control power supply circuit of the electric control cabinet is electrically connected with UPS equipment, one end of the power supply circuit of the direct current oil pump is electrically connected with a direct current power supply end, and; the protection circuit comprises a first oil pump protector, a second oil pump protector and a barring motor protector, wherein the first oil pump protector is electrically connected with a first oil pump motor, the second oil pump protector is electrically connected with a second oil pump motor, and the barring motor protector is electrically connected with a barring motor; the control circuit includes a local/remote controller that connects the devices.

2. The back pressure turbine oil station control device according to claim 1, wherein the power supply switching circuit is constituted by a plurality of protection switches.

3. The backpressure turbine oil station control device of claim 1, wherein the power branch comprises three branches respectively connected to three phase ends of the device, the branches comprising: the power supply switching circuit comprises a motor protection switch electrically connected with the power supply switching circuit, a first intermediate relay connected with the motor protection switch and a first thermal relay connected with the first intermediate relay.

4. The back pressure turbine oil station control apparatus of claim 1, wherein the first oil pump protector, the second oil pump protector, and the barring machine protector each employ a motor protector-ZYD 3.

5. The backpressure turbine oil station control device of claim 1, wherein the dc oil pump power supply circuit comprises: the direct-current oil pump comprises a direct-current motor protection switch connected with a direct-current oil pump power supply, a direct-current end first intermediate relay connected with the direct-current motor protection switch, a direct-current end toggle switch connected with the direct-current end first intermediate relay, a direct-current end resistor connected with the direct-current end intermediate relay and the armature positive end of the direct-current oil pump, and a direct-current end second intermediate relay connected with the direct-current end resistor in parallel.

Technical Field

The invention relates to the technology of a back pressure steam turbine, in particular to a control device of a back pressure steam turbine oil station.

Background

The heat supply equipment comprises 2 backpressure turbines, 3 pneumatic pump oil station control cabinets and the like, and the backpressure turbine oil station control equipment, particularly a control loop, mainly provides lubricating oil for a backpressure turbine and a pneumatic pump sliding bearing. However, the existing backpressure steam turbine oil station control technology has the following problems: after the control power supply AC 220V-to-DC 24V arrangement transformer is damaged, the oil pumps #1 and #2 are caused to be incapable of being started normally due to accidents, lubricating oil of a back pressure turbine and a pneumatic pump cannot be supplied, further, sliding bearings of the back pressure machine and the pneumatic pump are damaged, and equipment damage and heat supply network accidents are caused.

Disclosure of Invention

Based on this, in order to solve the shortcoming that exists in prior art, the special back pressure steam turbine oil station controlling means that has proposed.

In order to achieve the purpose, the corresponding technical scheme is as follows:

backpressure steam turbine oil station controlling means, its characterized in that includes: the protection circuit comprises a power supply circuit, a protection circuit and a control circuit; the power supply circuit comprises a power supply switching circuit, a plurality of power supply branches, an electric control cabinet control power supply circuit and a direct-current oil pump power supply circuit; the power supply switching circuit is connected with a control power supply circuit of an electric control cabinet, one end of each power supply branch is electrically connected with the output end of the power supply switching circuit, the other end of each power supply branch is respectively connected with each device in the backpressure steam turbine set, the devices at least comprise a first oil pump motor, a second oil pump motor, an electric heater, an oil smoke exhaust fan, a barring motor, a shaft seal cooler, a regulating valve power oil pump, a first regulating valve regulating oil pump, a second regulating valve regulating oil pump and a quick-closing valve oil pump, the control power supply circuit of the electric control cabinet is electrically connected with UPS equipment, one end of the power supply circuit of the direct current oil pump is electrically connected with a direct current power supply end, and; the protection circuit comprises a first oil pump protector, a second oil pump protector and a barring motor protector, wherein the first oil pump protector is electrically connected with a first oil pump motor, the second oil pump protector is electrically connected with a second oil pump motor, and the barring motor protector is electrically connected with a barring motor; the control circuit includes a local/remote controller that connects the devices.

Optionally, in one embodiment, the power switching circuit is formed by a plurality of protection switches.

Optionally, in one embodiment, the power supply branch includes three branches respectively connected to three phase terminals of the device, and the branches include: the power supply switching circuit comprises a motor protection switch electrically connected with the power supply switching circuit, a first intermediate relay connected with the motor protection switch and a first thermal relay connected with the first intermediate relay.

Optionally, in one embodiment, the first oil pump protector, the second oil pump protector and the turning gear protector are all motor protectors, which are of type ZYD 3.

Optionally, in one embodiment, the dc oil pump power circuit includes: the direct-current oil pump comprises a direct-current motor protection switch connected with a direct-current oil pump power supply, a direct-current end first intermediate relay connected with the direct-current motor protection switch, a direct-current end toggle switch connected with the direct-current end first intermediate relay, a direct-current end resistor connected with the direct-current end intermediate relay and the armature positive end of the direct-current oil pump, and a direct-current end second intermediate relay connected with the direct-current end resistor in parallel.

The embodiment of the invention has the following beneficial effects:

the invention has the advantages of simple improved structure, easy operation, reasonable control circuit layout and the like, changes the control power supply into the direct-current oil pump power supply when the first oil pump motor and the second oil pump motor can not be started through the self-designed direct-current oil pump power supply circuit, and effectively ensures the reliable operation of equipment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Wherein:

FIG. 1 is a circuit diagram of an integrated control device of a steam turbine oil station according to an embodiment;

FIG. 2 is a schematic diagram of an embodiment of a power switching circuit;

FIG. 3 is a schematic diagram of a power branch circuit in one embodiment;

4a-4c are schematic electrical schematic diagrams of the first oil pump protector, the second oil pump protector and the barring machine protector, respectively, according to an embodiment;

FIG. 5 is a schematic circuit diagram of a control power supply circuit of the electric control cabinet in one embodiment;

fig. 6a-6b are schematic illustrations of two circuit principles of the dc oil pump power circuit in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.

The application provides a backpressure steam turbine oil station control device which mainly ensures that continuous lubricating oil is provided for a backpressure machine, a pneumatic pump sliding bearing and the like, and prevents equipment damage and heat supply network accidents caused by damage of the backpressure machine and the pneumatic pump sliding bearing due to the lubricating oil supply problem; specifically, as shown in fig. 1 to 6, the method includes: the protection circuit comprises a power supply circuit, a protection circuit and a control circuit; the power supply circuit comprises a power supply switching circuit, a plurality of power supply branches, an electric control cabinet control power supply circuit and a direct-current oil pump power supply circuit; the power supply switching circuit is connected with a control power supply circuit of an electric control cabinet, one end of each power supply branch is electrically connected with the output end of the power supply switching circuit, the other end of each power supply branch is respectively connected with each device in the backpressure steam turbine set, the devices at least comprise a first oil pump motor M1, a second oil pump motor M2, an electric heater, an oil fume exhaust fan M3, a barring motor M4, a shaft seal cooler M5, a regulating valve power oil pump M8, a first regulating valve regulating oil pump M7-1, a second regulating valve regulating oil pump M7-2 and a quick closing valve oil pump M6, the control power supply circuit of the electric control cabinet is electrically connected with UPS equipment, one end of the power supply circuit of the direct current oil pump is electrically connected with a direct current power supply end, and the; the protection circuit comprises a first oil pump protector, a second oil pump protector and a barring motor protector, wherein the first oil pump protector is electrically connected with a first oil pump motor, the second oil pump protector is electrically connected with a second oil pump motor, and the barring motor protector is electrically connected with a barring motor; the control circuit includes a local/remote controller that connects the devices.

In a specific embodiment, the power switching circuit is composed of a plurality of protection switches, as shown in fig. 2.

In one embodiment, the power supply branch includes three branches respectively connected to three phase terminals of the device, and each of the branches has the same structure, and includes: the power supply switching circuit comprises a motor protection switch electrically connected with the power supply switching circuit, a first intermediate relay connected with the motor protection switch and a first thermal relay connected with the first intermediate relay. For example, a power branch connected with the first oil pump motor, which has three branches respectively connected with U, V, W three-phase ends of the motor, wherein, the branch connected with the U end includes a motor protection switch QM1 electrically connected with the power switching circuit, a first intermediate relay KM1 connected with the motor protection switch QM1, and a first thermal relay FR1-1 connected with the first intermediate relay KM1, and the specific circuit is as shown in fig. 3.

In one embodiment, the first oil pump protector, the second oil pump protector and the barring motor protector are all motor protectors-ZYD 3, wherein the intelligent motor protector ZYD3 has functions of alarming, communicating, remote controlling and the like selectively through a controller, as shown in fig. 4a-4 c.

In one embodiment, the direct-current oil pump starting circuit uses direct current 220V as a direct-current control power supply; namely, the direct current oil pump power supply circuit comprises: the direct-current motor protection switch QM15 is connected with a direct-current oil pump power supply DC220V, a direct-current end first intermediate relay KM10 is connected with the direct-current motor protection switch QM15, a direct-current end toggle switch KA11 is connected with the direct-current end first intermediate relay KM10, a direct-current end resistor R is connected with the direct-current end intermediate relay KM10 and the armature positive end of the direct-current oil pump, and a direct-current end second intermediate relay KM11 is connected with the direct-current end resistor R in parallel.

In a more specific embodiment, as shown in fig. 6a-6b, the dc oil pump power circuit further comprises: an alternative circuit, comprising: the first button switch group, the second button switch and the direct current end toggle switch KA 22; the control power supply can replace KA11 and change the control power supply into a direct-current oil pump power supply, and reliable operation of equipment is effectively guaranteed.

In a specific embodiment, the control circuit comprises a local/remote controller, the local/remote controller is connected with each device, the local controller is arranged on an oil supply pipeline of each device and comprises a liquid level alarm, a pressure alarm, a control knob and a local control chip so as to monitor the oil supply condition at any time, and when the oil supply condition exceeds a limit, the control circuit controls and switches three oil pump power supplies, so that the continuity and reliability of oil supply in the operation process can be realized, meanwhile, the unattended operation can be realized, and a large amount of labor and operation can be saved; the control knob can be switched from an automatic state to a manual state according to the requirements of the site, and manual control is carried out; the remote controller and each oil pump complete remote monitoring control and historical data record backup or fault alarm through a liquid level pressure monitoring device connected with the oil pump; so as to realize the full-automatic oil supply control process of the backpressure steam turbine oil station.

The working principle of the invention comprises: because the device is provided with three independent oil pump power supplies and control power supplies; in the working process, two alternating-current oil pumps (a first oil pump #1 and a second oil pump # 2) start to work, if one of the alternating-current oil pumps fails and can not be started, such as the first oil pump #1 fails, the second oil pump #2 is controlled to start to work, and if the two alternating-current oil pumps can not be started, the direct-current oil pump is started to continue to supply oil; the reliable operation of the oil pump in the oil supply process is ensured.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.