Protection three-way valve for economizer

Abstract

The utility model discloses a three-way valve for protecting an economizer, and belongs to the technical field of boiler equipment. A three-way valve for protecting an economizer comprises a valve body. The valve body comprises a straight tube and a side connecting tube, and the side connecting tube is communicated with the straight tube; the mounting seat is fixedly connected in the straight tube; the sliding rod is slidably connected to the mounting base, and a first valve element is fixedly connected to the bottom of the sliding rod; a second valve element is connected into the side connecting pipe, and a limiting rod is fixedly connected to the second valve element. The limiting rod is connected with the sliding rod through a connecting part; the water supply pressure and the first valve element in the straight barrel pipe are combined and matched for use, in the operation process, opening or closing of the valve does not need to be judged and operated manually, the situation that the valve is not opened or closed in time due to the problems of manual judgment lag, errors and the like is effectively avoided, and the service life of the valve is prolonged. And the burning-out condition of the economizer is reduced.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, and in particular to an economizer protection three-way valve. Background Technology

[0002] An economizer is a device installed at the bottom of the boiler flue to recover the waste heat of the exhaust gas. It heats the boiler feedwater to saturated water at the pressure of the steam drum. Because it absorbs heat from the high-temperature flue gas, it reduces the exhaust gas temperature, saves energy, and improves efficiency, hence the name economizer. During boiler operation, the initial startup or shutdown phase is a critical period. At this time, the evaporation rate is very low, making it difficult to continuously feed water into the steam drum. When the water supply stops, the water in the economizer tubes is basically stagnant, which can easily lead to poor cooling of the tube walls and cause the economizer to overheat and burn out.

[0003] To address the issue of economizer burnout, a common solution is to add a remote control valve to the economizer recirculation pipe, relying on manual judgment to determine when to open or close the valve. However, in practice, manual judgment is susceptible to various factors, leading to delays and errors in judgment, which may result in the valve not opening or closing in a timely manner, potentially causing equipment damage. Utility Model Content

[0004] The purpose of this utility model is to solve the problems mentioned in the background art and to propose an economizer protection three-way valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An economizer protection three-way valve, comprising:

[0007] Valve body;

[0008] The valve body includes a straight tube and a side pipe, and the side pipe is connected to the straight tube.

[0009] Mounting bracket, fixedly connected inside the straight tube;

[0010] A slide rod is slidably connected to a mounting base, and a first valve core is fixedly connected to the bottom of the slide rod;

[0011] A second valve core is connected to the side pipe, and a limit rod is fixedly connected to the second valve core;

[0012] The limiting rod is connected to the sliding rod via a connecting part.

[0013] Preferably, the connecting part includes a connecting rod, a first rotating shaft and a second rotating shaft, the first rotating shaft being fixedly connected to the slide rod, the second rotating shaft being fixedly connected to the limiting rod, and both the first rotating shaft and the second rotating shaft being rotatably connected to the connecting rod.

[0014] Preferably, a support rod is fixedly connected to the side pipe, and a limiting sleeve is fixedly connected to the support rod, with the limiting rod and the limiting sleeve being slidably connected.

[0015] Preferably, a spring seat is fixedly connected to the slide rod, a spring is fixedly connected to the spring seat, and the end of the spring away from the spring seat is fixedly connected to the mounting base.

[0016] Preferably, a first limiting ring is fixedly connected in the straight tube, and the first valve core is in contact with the first limiting ring.

[0017] Preferably, a second limiting ring is fixedly connected to the side pipe, and the second valve core is in contact with the second limiting ring.

[0018] Compared with the prior art, this utility model provides a three-way valve for economizer protection, which has the following beneficial effects:

[0019] The parts not covered in this device are the same as or can be implemented using existing technologies. This utility model utilizes the water supply pressure and the first valve core in the straight pipe in combination. During operation, there is no need for manual judgment and operation of the valve opening or closing, which effectively avoids the situation where the valve is not opened or closed in time due to problems such as delays or errors in manual judgment, and reduces the possibility of the economizer burning out. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an economizer protection three-way valve proposed in this utility model;

[0021] Figure 2 This is a cross-sectional view of an economizer protection three-way valve proposed in this utility model;

[0022] Figure 3 This utility model proposes a schematic diagram of the connection structure between the mounting base and the slide rod in an economizer protection three-way valve. Figure 1 ;

[0023] Figure 4 This utility model proposes a schematic diagram of the connection structure between the mounting base and the slide rod in an economizer protection three-way valve. Figure 2 ;

[0024] Figure 5 This is a schematic diagram of the working structure of an economizer protection three-way valve embodiment proposed in this utility model.

[0025] In the diagram: 1. Valve body; 101. First flange; 102. Second flange; 103. Third flange; 104. First limiting ring; 105. Second limiting ring; 106. Support rod; 1061. Limiting sleeve; 2. Mounting seat; 201. Spring; 3. Slide rod; 301. Spring seat; 302. First rotating shaft; 303. First valve core; 4. Connecting rod; 5. Limiting rod; 501. Second valve core; 502. Second rotating shaft; 6. Economizer; 601. First connecting pipe; 7. Steam drum; 701. Second connecting pipe; 702. Third connecting pipe; 8. Water supply pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1:

[0028] Reference Figures 1-5 An economizer protection three-way valve, comprising:

[0029] Valve body 1;

[0030] Valve body 1 includes a straight tube 10 and a side pipe 9, the side pipe 9 being connected to the straight tube 10;

[0031] Mounting base 2 is fixedly connected to the straight tube 10;

[0032] The slide rod 3 is slidably connected to the mounting base 2, and the bottom of the slide rod 3 is fixedly connected to the first valve core 303;

[0033] A second valve core 501 is connected to the side pipe 9, and a limit rod 5 is fixedly connected to the second valve core 501.

[0034] The limiting rod 5 is connected to the slide rod 3 through the connecting part.

[0035] The connecting part includes a connecting rod 4, a first rotating shaft 302 and a second rotating shaft 502. The first rotating shaft 302 is fixedly connected to the slide rod 3, and the second rotating shaft 502 is fixedly connected to the limiting rod 5. Both the first rotating shaft 302 and the second rotating shaft 502 are rotatably connected to the connecting rod 4.

[0036] Reference Figure 1 The valve body 1 is connected to a first flange (101), a second flange (102) and a third flange (103), which are used to connect to the connecting pipes during use.

[0037] A support rod 106 is fixedly connected to the side pipe 9, and a limit sleeve 1061 is fixedly connected to the support rod 106. The limit rod 5 is slidably connected to the limit sleeve 1061.

[0038] Reference Figure 2 In specific implementation, the limiting sleeve 1061 set in the side pipe 9 can limit the limiting rod 5 so that when it is pushed, it can stably and horizontally push the second valve core 501 to move.

[0039] A spring seat 301 is fixedly connected to the slide rod 3, and a spring 201 is fixedly connected to the spring seat 301. The end of the spring 201 away from the spring seat 301 is fixedly connected to the mounting base 2.

[0040] A first limiting ring 104 is fixedly connected in the straight tube 10, and the first valve core 303 is attached to the first limiting ring 104.

[0041] The first limiting ring 104, which is fixedly connected inside the straight tube 10, can effectively limit the first valve core 303.

[0042] A second limiting ring 105 is fixedly connected in the side pipe 9, and the second valve core 501 is attached to the second limiting ring 105.

[0043] The second limiting ring 105, which is set in the side pipe 9, can effectively limit the second valve core 501.

[0044] Reference Figure 5 Before use, the operator connects the valve body 1 to the water supply pipe 8 of the external water pump, and connects the end of the valve body 1 away from the water supply pipe 8 to the first connecting pipe 601. The side pipe 9 is connected to the third connecting pipe 702, and the other end of the third connecting pipe 702 is connected to the steam drum 7. The end of the first connecting pipe 601 away from the valve body 1 is connected to the economizer 6. The economizer 6 is connected to the second connecting pipe 701, and the end of the second connecting pipe 701 away from the economizer 6 is connected to the steam drum 7.

[0045] Reference Figures 1-5 In specific implementation, when water is supplied to the steam drum 7, the feedwater pump starts, and water flows into the straight pipe 10 of the valve body 1. Under the action of water pressure, the slide rod 3 compresses the spring 201 and moves, opening the passage of the straight pipe 10. When the slide rod 3 slides, it will also push the connecting rod 4 to move synchronously. When the connecting rod 4 moves, it will squeeze and push the limit rod 5 to slide. At this time, the sliding of the limit rod 5 will synchronously push the second valve core 501 to press on the second limit ring 105. After the second valve core 501 is pressed, the passage of the side pipe 9 is closed, and water is supplied to the steam drum 7 through the economizer 6 and the second connecting pipe 701.

[0046] Reference Figures 1-5In specific implementation, when the water supply to the steam drum 7 is stopped, the feedwater pump stops working, the water pressure in the straight tube 10 disappears, and under the restoring force of the spring 201, the slide rod 3 moves downward. At this time, the first valve core 303 at the bottom of the slide rod 3 presses against the first limit ring 104. After the first valve core 303 is pressed, the passage of the straight tube 10 is closed, and the slide rod 3 slides down and simultaneously pulls the connecting rod 4 to move, thereby pulling the limit rod 5 to slide. At this time, the second valve core 501 is no longer pressed against the second limit ring 105. At this time, the passage of the side pipe 9 is opened, and the water in the steam drum 7 enters the economizer 6. Through vaporization and evaporation, heat is carried away, thus protecting the economizer 6.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A three-way valve for economizer protection, characterized in that, include: Valve body (1); The valve body (1) includes a straight tube (10) and a side pipe (9), and the side pipe (9) is connected to the straight tube (10); Mounting base (2) is fixedly connected in straight tube (10); The slide rod (3) is slidably connected to the mounting base (2), and the bottom of the slide rod (3) is fixedly connected to the first valve core (303); A second valve core (501) is connected to the side pipe (9), and a limit rod (5) is fixedly connected to the second valve core (501); The limiting rod (5) is connected to the slide rod (3) through the connecting part.

2. The economizer protection three-way valve according to claim 1, characterized in that, The connecting part includes a connecting rod (4), a first rotating shaft (302) and a second rotating shaft (502). The first rotating shaft (302) is fixedly connected to the slide rod (3), and the second rotating shaft (502) is fixedly connected to the limiting rod (5). Both the first rotating shaft (302) and the second rotating shaft (502) are rotatably connected to the connecting rod (4).

3. The economizer protection three-way valve according to claim 1, characterized in that, A support rod (106) is fixedly connected to the side pipe (9), and a limiting sleeve (1061) is fixedly connected to the support rod (106). The limiting rod (5) is slidably connected to the limiting sleeve (1061).

4. The economizer protection three-way valve according to claim 1, characterized in that, A spring seat (301) is fixedly connected to the slide rod (3), and a spring (201) is fixedly connected to the spring seat (301). The end of the spring (201) away from the spring seat (301) is fixedly connected to the mounting base (2).

5. The economizer protection three-way valve according to claim 1, characterized in that, A first limiting ring (104) is fixedly connected in the straight tube (10), and the first valve core (303) is in contact with the first limiting ring (104).

6. The economizer protection three-way valve according to claim 5, characterized in that, A second limiting ring (105) is fixedly connected in the side pipe (9), and the second valve core (501) is in contact with the second limiting ring (105).

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