Efficient energy-saving no-load running check valve

Abstract

The utility model relates to an efficient energy-saving no-load running check valve. The valve comprises a valve body, a main valve channel is arranged in the valve body, one end is used for being connected with a boiler, the other end is used for being connected with a water pump, a main valve clack is arranged in the valve body, and an auxiliary channel is arranged on the valve body and used for being communicated with a deaerator or a condenser. The valve body is provided with an electromagnetic valve used for stopping or opening the auxiliary valve channel, and the electromagnetic valve is in a normally-open type. The valve is directly and vertically arranged at the outlet of the water pump. In the working state, when the water feeding pump is just started or the water feeding amount is as small as the limit requirement, the electromagnetic valve is not electrified and is kept in the open state, the main valve clack of the valve is normally opened, and fed water enters the deaerator or the condenser through the auxiliary valve channel. According to the water supply requirement of the boiler, when the required flow is larger than a certain value (the minimum flow of the pump), the electromagnetic valve is powered on, and the auxiliary valve channel is stopped. Compared with the prior art, a shifting fork, an auxiliary valve clack and linkage action between the shifting fork and the auxiliary valve clack are omitted in the valve body, the structure is simple, faults are not prone to occurring, and use is convenient.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a high-efficiency and energy-saving air vent check valve. Background Technology

[0002] In thermal power generating units, the output of the boiler feedwater pump varies with the boiler load. During boiler startup or at very low loads, the feedwater pump may operate with a very small flow rate. The water temperature rises due to prolonged friction and heat generated by the impeller within the pump body. Once the water temperature reaches a certain level, vaporization occurs, leading to cavitation and damage to the feedwater pump. Therefore, a recirculation system is installed between the feedwater pump outlet and the deaerator (or condenser) tank. When the feedwater pump is just starting up or the flow rate is low enough, the recirculation system is opened to increase the pump's flow rate, returning some water to the deaerator tank to ensure a certain flow rate (temporarily referred to as the pump's minimum flow rate: generally about 30% of the rated flow rate) passes through the pump without causing the water temperature inside the pump to rise and vaporize. When the feedwater flow rate is under normal conditions, the recirculation system is closed.

[0003] Traditional recirculation control systems, such as valves, Figure 1 As shown, the valve includes a valve body 1, a main valve disc 2, a spring 3, a fork 4, a secondary valve disc 5, a valve seat 6, a bypass pipe 8, and a throttling orifice plate 9. One end of the fork is connected to the main valve disc, and the other end is connected to the secondary valve disc. The valve seat 6 is provided with a valve seat hole 7, and the secondary valve disc is used to block or open the valve seat hole. This valve works in a high-pressure variable frequency / fixed frequency water pump high-pressure water supply system and is directly installed at the water pump outlet, vertically. Working principle: When entering the working state, the water pump starts first. When the water pump just starts or the water supply is small enough to meet the limit, the main valve disc partially opens, and the fork moves along with the main valve disc. At this time, part of the water supply enters the boiler through the main channel (upper and lower channels), and the rest of the water supply enters the deaerator through the valve seat hole and the throttling orifice plate. According to the boiler water supply demand, when the demand flow rate is greater than a certain value (the pump's minimum flow rate), the main valve disc fully opens, the fork is horizontal, and the secondary valve disc closes with the valve seat to seal the channel (horizontal channel), and the circulation system is closed. The opening height of the main valve disc is determined by the pressure difference created by the flow of water above and below the main valve disc, which generates an opening force on the main valve disc. This opening force, together with the spring, acts to open the main valve disc to the desired position.

[0004] The valves mentioned above have many internal parts and a complex structure. In particular, the linkage between the main valve disc, the shift fork, and the auxiliary valve disc is prone to failure, making them inconvenient to use. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency and energy-saving air vent check valve that is simple in structure, not prone to failure, and easy to use.

[0006] To achieve the above objectives, the present invention provides a high-efficiency and energy-saving air vent check valve, which adopts the following technical solution: A high-efficiency and energy-saving air vent check valve includes a valve body, which has a main valve passage, one end of which is used to connect to a boiler and the other end of which is used to connect to a water pump. The valve body is provided with a main valve disc, and the valve body is provided with a secondary passage for connecting to a deaerator or a condenser. The valve body is provided with a solenoid valve for shutting off or opening the secondary valve passage. The solenoid valve is normally open.

[0007] The valve body is provided with an installation cavity whose axis is perpendicular to and connected to the axis of the secondary valve passage. The installation cavity is provided with a spring and a switching shaft whose axis direction is consistent with the axis direction of the installation cavity. An electromagnet part is provided outside the valve body. The switching shaft has a blocking part for blocking the secondary valve passage and a connecting part for opening the secondary valve passage.

[0008] The outer surface of the conversion shaft is provided with an annular groove that keeps the axial direction consistent after the axial direction is converted, so as to form the connecting part.

[0009] The conversion shaft is provided with a connecting channel for the mounting cavity at both ends of the conversion shaft. The conversion shaft is also provided with a horizontal channel. When the conversion shaft blocks the secondary valve channel and when it opens the secondary valve channel, the horizontal channel is always connected to the secondary valve channel and the connecting channel.

[0010] A bypass pipe is connected to one end of the secondary valve passage on the valve body, and a throttling orifice plate is provided inside the bypass pipe.

[0011] A first flange is provided on one end of the secondary valve passage on the valve body, and a second flange is provided on the bypass pipe opposite to the first flange and connected by bolts.

[0012] The beneficial effects of this utility model are as follows: This valve is directly installed at the water pump outlet and is installed vertically. When entering the working state, the feedwater pump starts first. When the feedwater pump has just started or the feedwater flow is low enough to meet the required limit, the solenoid valve is not energized and remains open. The main valve disc of the valve is normally open, and the feedwater enters the deaerator or condenser through the secondary valve passage. Based on the boiler feedwater demand, when the required flow rate exceeds a certain value (the pump's minimum flow rate), the solenoid valve is energized, shutting off the secondary valve passage. Compared with valves in existing recirculation systems, this valve body eliminates the need fork and secondary valve disc, as well as their interlocking action, resulting in a simpler structure, reduced malfunctions, and easier operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the valve structure in the background art;

[0014] Figure 2 This is a schematic diagram of the structure of one embodiment of a high-efficiency and energy-saving air vent check valve of this utility model;

[0015] Figure 3 yes Figure 2Schematic diagram of the structure at point I, direction A;

[0016] Figure 4 yes Figure 3 A schematic diagram of the structure when the intermediate solenoid valve is conducting the auxiliary valve passage;

[0017] Figure 5 yes Figure 3 A schematic diagram of the structure when the solenoid valve in the middle stops the auxiliary valve channel. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The use of "belonging" in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this invention.

[0020] An embodiment of this utility model of a high-efficiency and energy-saving air vent check valve, such as... Figures 2-5 As shown, the system includes a valve body 1, which has a main valve passage 2. The main valve passage contains a main spring 4 and a main valve disc 3. One end of the main valve passage connects to a boiler, and the other end connects to a water pump. A secondary passage 5 is provided on the valve body for connecting to a deaerator or condenser. A solenoid valve, normally open, is provided on the valve body for shutting off or opening the secondary valve passage. In this embodiment, when the solenoid valve is not in operation, it is normally open, and the secondary valve passage is open. Specifically, the valve body has a mounting cavity 11 whose axis is perpendicular to and connected to the axis of the secondary valve passage 5. A spring 13 and a switching shaft 12, whose axis direction is consistent with the axis direction of the mounting cavity, are provided in the mounting cavity 11. An electromagnet part 14 is provided outside the valve body for attracting the switching shaft to move and shut off the secondary valve passage.

[0021] The switching shaft 12 has a blocking portion 16 for blocking the secondary valve passage 5 and a connecting portion 15 for opening the secondary valve passage. In this embodiment, an annular groove with the same axial direction after the axial direction is switched is provided on the outer surface of the switching shaft to form the aforementioned connecting portion. The switching shaft 12 is provided with connecting channels (17, 18) connecting the mounting cavity portions at both ends of the switching shaft. The switching shaft 12 is also provided with a horizontal channel 19. When the switching shaft blocks the secondary valve passage and when it opens the secondary valve passage, the horizontal channel always connects the secondary valve passage and the connecting channel so that fluid can be delivered into the mounting cavity portions at both ends of the switching shaft.

[0022] In this embodiment, the solenoid valve is normally open, meaning that when the electromagnet is not energized, the solenoid valve is open, and the secondary valve passage is open, allowing fluid to flow backward through the connecting part on the switching shaft. When the electromagnet is energized, the blocking part of the driving switching shaft can stop the secondary valve passage. The valve of this invention is normally open and not energized; it is only energized when the required flow rate exceeds a certain value (the pump's minimum flow rate), resulting in high efficiency and energy saving. A bypass pipe 6 is connected to one end of the secondary valve passage 5 on the valve body. A throttling orifice plate 7 is installed inside the bypass pipe to buffer and slow down the fluid. A first flange 8 is provided at one end of the secondary valve passage on the valve body, and a second flange 9 is provided on the bypass pipe opposite to the first flange and connected by bolts 10.

[0023] The valve in this embodiment operates in a high-pressure variable frequency / fixed frequency water pump high-pressure water supply system. This valve is directly installed at the pump outlet, vertically. Its working principle is as follows: When entering the working state, the water pump starts first. When the water pump just starts or the water flow is low enough to meet the required limit, the solenoid valve is not energized and remains open (e.g., ...). Figure 4 When the main valve disc is normally open, the feedwater enters the deaerator or condenser after being throttled and depressurized through the bypass pipe; according to the boiler feedwater demand, when the demand flow rate exceeds a certain value (the pump's minimum flow rate), the control room receives a signal, the solenoid valve is energized, and the switching shaft closes the secondary valve passage and bypass pipeline (e.g., Figure 5 The recirculation system is shut down.

[0024] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to 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; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0026] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

Claims

1. A high-efficiency and energy-saving air vent check valve, comprising a valve body having a main valve passage, one end for connecting to a boiler and the other end for connecting to a water pump, a main valve disc being provided in the valve body, and a secondary passage being provided on the valve body for connecting to a deaerator or a condenser, characterized in that: The valve body is provided with a solenoid valve for shutting off or opening the secondary valve passage. The solenoid valve is normally open. The valve body is provided with a mounting cavity whose axis is perpendicular to and connected to the axis of the secondary valve passage. The mounting cavity is provided with a spring and a switching shaft whose axis direction is consistent with the axis direction of the mounting cavity. An electromagnet part is provided outside the valve body. The switching shaft has a blocking part for blocking the secondary valve passage and a connecting part for opening the secondary valve passage.

2. The high-efficiency energy-saving air vent check valve according to claim 1, characterized in that: The outer surface of the conversion shaft is provided with an annular groove that keeps the axial direction consistent after the axial direction is converted, so as to form the connecting part.

3. The high-efficiency energy-saving air vent check valve according to claim 1, characterized in that: The conversion shaft is provided with a connecting channel for the mounting cavity at both ends of the conversion shaft. The conversion shaft is also provided with a horizontal channel. When the conversion shaft blocks the secondary valve channel and when it opens the secondary valve channel, the horizontal channel is always connected to the secondary valve channel and the connecting channel.

4. The high-efficiency energy-saving air vent check valve according to any one of claims 1-3, characterized in that: A bypass pipe is connected to one end of the secondary valve passage on the valve body, and a throttling orifice plate is provided inside the bypass pipe.

5. The high-efficiency energy-saving air vent check valve according to claim 4, characterized in that: A first flange is provided on one end of the secondary valve passage on the valve body, and a second flange is provided on the bypass pipe opposite to the first flange and connected by bolts.

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