Safety device for emergency drain valve of indirect cooling tower

Abstract

The application provides a safety device for an emergency drain valve of an intercooling tower, which comprises an emergency drain valve body installed on a water inlet pipe and a water return pipe of the intercooling tower, a safety hole is formed in the emergency drain valve body; a cylindrical mounting shell is arranged on the shell of the emergency drain valve body, a threaded push rod is rotatably arranged in the mounting shell, a sliding block capable of moving along the length direction of the threaded push rod is threadedly sleeved on the threaded push rod, and the end of the threaded push rod away from the emergency drain valve body penetrates through the mounting shell; a latch is fixedly connected with the sliding block at one end, and the other end of the latch slides through the mounting shell and extends into the safety hole to abut against a valve rod in the emergency drain valve body; and an electric actuator is connected with the end of the threaded push rod penetrating through the mounting shell, and is used for driving the threaded push rod to rotate in the mounting shell. The application reduces the possibility that the emergency drain valve is opened due to unexpected situations, thereby improving the safety performance of the emergency drain valve body.

Description

Technical Field

[0001] This application relates to the field of indirect cooling tower technology, and in particular to a safety device for an emergency drain valve of an indirect cooling tower. Background Technology

[0002] Thermal power plants utilize indirect cooling towers during production. Specifically, these towers significantly reduce water consumption during the power plant's operation through a closed-loop system. To quickly drain accumulated water from the pipes in case of system failure or extreme conditions, preventing equipment damage due to freezing, overpressure, or water hammer, and ensuring safe system shutdown, emergency drain valves are typically installed on the inlet and outlet pipes of the indirect cooling tower. These valves are usually hydraulically controlled. Therefore, in special circumstances such as signal reception errors in the hydraulic control system, the emergency drain valve may open, causing water to drain from the closed-loop system. This can affect the cooling effect of the power plant units and consequently disrupt the normal operation of the power plant. Based on this, this application proposes a safety device for the emergency drain valve of an indirect cooling tower. Utility Model Content

[0003] This application provides a safety device for an emergency drain valve of an indirect cooling tower to solve the technical problems described in the background art.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution: This application provides a safety device for an emergency drain valve of an indirect cooling tower, comprising: An emergency drain valve body is installed on the inlet and return water pipes of the indirect cooling tower, and a safety hole is provided on the emergency drain valve body; A columnar mounting housing is disposed on the housing of the emergency drain valve body, and a threaded push rod is rotatably disposed therein. A slider capable of moving along the length direction of the threaded push rod is threaded on the threaded push rod, and one end of the slider away from the emergency drain valve body passes through the mounting housing. A pin, one end of which is fixedly connected to the slider, and the other end of which slides through the mounting housing and extends into the safety hole to abut against the valve stem inside the emergency drain valve body; An electric actuator is provided, wherein the output shaft of the electric actuator is connected to one end of the threaded push rod that passes through the mounting housing, and is used to drive the threaded push rod to rotate within the mounting housing.

[0005] Optionally, the mounting housing has an observation through hole along its length.

[0006] Optionally, the length of the threaded section of the threaded push rod is greater than the insertion / removal distance of the pin.

[0007] Optionally, a limit block is provided at the bottom of the slider; The mounting housing has a limiting groove extending along its own length. The limiting block is adapted to the limiting groove and its bottom is embedded in the limiting groove and can slide along the length of the limiting groove.

[0008] Optionally, the pin has a sliding groove along its length. The inner wall of the mounting housing is provided with a sliding block that is adapted to the sliding groove. The sliding block is embedded in the sliding groove and can slide along the length of the sliding groove.

[0009] Optionally, a friction layer is provided at the end of the pin that abuts against the valve stem of the emergency drain valve body.

[0010] Optionally, a bushing is rotatably mounted on the output shaft of the electric actuator; Both ends of the mounting housing are detachably connected to the housing of the emergency drain valve body and the bushing respectively by fastening bolts.

[0011] The safety device for the emergency drain valve of the indirect cooling tower provided in this application involves creating a safety hole in the valve body and installing a mounting housing on the valve body. A threaded push rod is rotatably mounted within the mounting housing, and a slider is threaded onto the push rod. A pin is fixedly connected to the slider, with one end of the pin sliding through the mounting housing and extending into the safety hole to connect with the valve stem inside the valve body. This allows the slider to move back and forth on the push rod as the push rod rotates within the mounting housing. During this movement, the pin is inserted and removed within the safety hole. Specifically, when the pin is inserted into the safety hole and abuts against the valve stem of the emergency drain valve body, it restricts the valve stem, preventing rotation of the valve stem in case of signal reception errors or other special circumstances in the hydraulic control system of the emergency drain valve body. This reduces the possibility of the emergency drain valve opening unexpectedly, thereby improving the safety performance of the emergency drain valve body, ensuring the cooling effect of the thermal power plant unit, and ensuring the normal operation of the thermal power plant. In addition, the end of the threaded push rod away from the body of the emergency drain valve passes through the mounting housing and is connected to the output shaft of the electric actuator. This enables the threaded push rod to rotate automatically through the electric actuator, improving the rotation efficiency of the threaded push rod and avoiding the need for manual pulling of the pin, thereby improving the insertion and removal efficiency of the pin. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a safety device for an emergency drain valve of an indirect cooling tower provided in an embodiment of this application; Figure 2 A schematic diagram of the structure of a safety device for an emergency drain valve of an indirect cooling tower provided in another embodiment of this application; Figure 3 A schematic diagram of the structure of a safety device for an emergency drain valve of an indirect cooling tower provided in another embodiment of this application; Figure 4 Provided for another embodiment of this application Figure 3 A partially enlarged schematic diagram of the safety device for the emergency drain valve of the intermediate cooling tower; Figure 5 A schematic diagram of the structure of a safety device for an emergency drain valve of an intercooler tower provided in another embodiment of this application.

[0014] In the diagram: 100, Emergency drain valve body; 101, Safety hole; 200, Mounting housing; 201, Observation through hole; 202, Limiting groove; 203, Sliding block; 300, Threaded push rod; 400, Sliding block; 401, Limiting block; 500, Pin; 501, Sliding groove; 600, Electric actuator; 601, Bushing; 700, Fastening bolt. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0016] refer to Figures 1 to 5 This application provides a safety device for an emergency drain valve of an indirect cooling tower, comprising: An emergency drain valve body 100 is installed on the inlet and outlet water pipes of the indirect cooling tower. The emergency drain valve body 100 has a safety hole 101. The specific structure and working principle of the emergency drain valve body 100 can be found in existing drain valves. The emergency drain valve body 100 is not an innovation of this application. Therefore, this application does not specifically limit it.

[0017] A columnar mounting housing 200 is mounted on the housing of the emergency drain valve body 100, and a threaded push rod 300 is rotatably mounted inside it. A slider 400 that can move along the length of the threaded push rod 300 is threadedly fitted on the threaded push rod 300, and the end of the slider 400 away from the emergency drain valve body 100 passes through the mounting housing 200. The mounting housing 200 can be connected to the emergency drain valve body 100 by fastening bolts to fix the mounting housing 200, while the threaded push rod 300 is rotatably connected to the mounting housing 200 by bearings.

[0018] A pin 500 is provided, one end of which is fixedly connected to the slider 400, and the other end of which slides through the mounting housing 200 and extends into the safety hole 101 to abut against the valve stem inside the emergency drain valve body 100. The purpose of providing the pin 500 is to prevent the valve stem of the emergency drain valve body 100 from rotating except under special circumstances (wherein, special circumstances refer to a signal reception error in the hydraulic control system of the emergency drain valve body 100 causing the emergency drain valve body 100 to open), thereby improving the safety of the emergency drain valve body 100 during use.

[0019] An electric actuator 600 has its output shaft connected to one end of a threaded push rod 300 that passes through a mounting housing 200, for driving the threaded push rod 300 to rotate within the mounting housing 200. The broadest definition of an actuator is: a drive device capable of providing linear or rotary motion, utilizing some driving energy and operating under the action of a control signal. Actuators use liquid, gas, electricity, or other energy sources and convert them into driving action through a motor, cylinder, or other device. The electric actuator 600 used in this application is used to convert rotary motion into linear motion. Since the electric actuator 600 is prior art and not an innovation of this application, it is not specifically limited herein.

[0020] The safety device for the emergency drain valve of the indirect cooling tower provided in this application involves opening a safety hole 101 on the emergency drain valve body 100, and installing a mounting housing 200 on the emergency drain valve body 100. A threaded push rod 300 is rotatably mounted inside the mounting housing 200, and a slider 400 is threadedly fitted onto the threaded push rod 300. A pin 500 is fixedly connected to the slider 400, with one end of the pin 500 away from the slider 400 sliding through the mounting housing 200 and extending into the safety hole 101 to connect with the valve stem inside the emergency drain valve body 100. This allows the slider 400 to move back and forth on the threaded push rod 300 as the threaded push rod rotates within the mounting housing 200. During the movement of the threaded push rod 300, the pin 500, which is fixedly connected to it, is inserted and removed into the safety hole 101. Specifically, when it is inserted into the safety hole 101 and abuts against the valve stem of the emergency drain valve body 100, the pin 500 restricts the valve stem of the emergency drain valve body 100, preventing the valve stem of the emergency drain valve body 100 from rotating in special circumstances such as signal reception errors in the hydraulic control system of the emergency drain valve body 100. This reduces the possibility of the emergency drain valve body 100 opening due to unexpected circumstances, thereby improving the safety performance of the emergency drain valve body 100, ensuring the cooling effect of the thermal power plant unit, and ensuring the normal operation of the thermal power plant. In addition, the end of the threaded push rod 300 away from the emergency drain valve body 100 passes through the mounting housing 200 and is connected to the output shaft of the electric actuator 600. This enables the threaded push rod 300 to rotate automatically through the electric actuator 600, improving the rotation efficiency of the threaded push rod 300 and avoiding the need for manual pulling of the pin 500, thereby improving the insertion and removal efficiency of the pin 500.

[0021] In actual use, when the closed-loop system malfunctions or extreme conditions occur, the safety device for the emergency drain valve of the indirect cooling tower provided in this application rotates the threaded push rod 300 by rotating the output shaft of the electric actuator 600 in either direction. During this rotation, the threaded push rod 300 drives the slider 400 on it to move away from the emergency drain valve body 100. As the slider 400 moves, it pulls the pin 500, which is fixedly connected to it, out of the safety hole 101, thereby releasing the pin 500 from restricting the valve stem of the emergency drain valve body 100. This allows the emergency drain valve body 100 to open and drain the accumulated water in the closed-loop system's pipeline. The electric actuator 600 is then turned on again after the water has drained. The actuator 600 causes the output shaft of the electric actuator 600 to rotate in either the reverse or forward direction, driving the threaded push rod 300 to rotate. During the rotation of the threaded push rod 300, the slider 400 on it moves along the threaded push rod 300 towards the emergency drain valve body 100. During the movement of the slider 400, the pin 500 fixedly connected to it gradually extends into the safety hole 101 and abuts against the valve stem of the emergency drain valve body 100, thereby restricting the valve stem of the emergency drain valve body 100 and preventing the valve stem of the emergency drain valve body 100 from opening except in the case of failure of the closed circulation system or extreme working conditions, thus improving the safety of the emergency drain valve body 100.

[0022] In some embodiments, reference Figure 1 The mounting housing 200 in this application has an observation through hole 201 along its own length.

[0023] In the above embodiments, the observation through hole 201 facilitates real-time observation of the sliding of the slider 400 on the threaded push rod 300, and also facilitates observation of the insertion and removal of the pin 500 in the safety hole 101, thereby improving the accuracy of the operation of the emergency drain valve body 100 being restricted by the pin 500 and the operation of releasing the restriction.

[0024] Optionally, to prevent debris from entering the mounting housing 200 and affecting the rotation of the threaded push rod 300 and the sliding of the slider 400, a viewing window can be installed on the observation through hole 201. The viewing window not only facilitates observation of the sliding of the slider 400 and the insertion and removal of the pin 500 inside the mounting housing 200, but also prevents debris from entering the mounting housing 200 and affecting the rotation of the threaded push rod 300 and the sliding of the slider 400, thereby ensuring the stability of the insertion and removal of the pin 500.

[0025] In some embodiments, the length of the threaded section of the threaded push rod 300 in this application is greater than the insertion and extraction distance of the pin 500.

[0026] In the above embodiment, in order to ensure that the pin 500 can be released from the emergency drain valve body 100, the pin 500 needs to be completely pulled out of the emergency drain valve body 100. The length of the threaded section of the threaded push rod 300 is greater than the insertion and extraction distance of the pin 500. This makes the distance that the slider 400 drives the pin 500 to move along the threaded push rod 300 greater than the insertion and extraction distance of the pin 500, ensuring that the pin 500 can be completely pulled out of the safety hole 101.

[0027] In some embodiments, reference Figure 2 In this application, the bottom of the slider 400 is provided with a limiting block 401; at the same time, the mounting housing 200 is provided with a limiting groove 202 extending along its own length direction. The limiting block 401 is adapted to the limiting groove 202 and its bottom is embedded in the limiting groove 202 and can slide along the length direction of the limiting groove 202.

[0028] In the above embodiment, when the slider 400 moves along the length of the threaded push rod 300 on the threaded push rod 300, the limiting block 401 at the bottom of the slider 400 also moves along the limiting groove 202 opened in the mounting housing 200. The movement of the limiting block 401 in the limiting groove 202 prevents the slider 400 from deflecting during the movement of the slider 400 along the length of the threaded push rod 300 while the threaded push rod 300 is rotating. This ensures that the slider 400 always moves in a straight line along the length of the threaded push rod 300, which facilitates the insertion and removal of the pin 500 in the safety hole 101.

[0029] In some embodiments, reference Figure 3 and Figure 4 In this application, the pin 500 has a sliding groove 501 along its own length direction; at the same time, the inner wall of the mounting housing 200 is provided with a sliding block 203 that is adapted to the sliding groove 501. The sliding block 203 is embedded in the sliding groove 501 and can slide along the length direction of the sliding groove 501.

[0030] In the above embodiment, the electric actuator 600 is activated, which drives the threaded push rod 300 connected to its output shaft to rotate. During the rotation of the threaded push rod 300, the slider 400, which is threaded onto the threaded push rod 300, moves along the length of the threaded push rod 300. During the movement of the slider 400, the pin 500, which is fixedly connected to it, is inserted and removed in the safety hole 101. During the insertion and removal process, the pin 500 also moves back and forth along the length of the mounting housing 200. The sliding block 203 inside the mounting housing 200 always slides in the sliding groove 501 on the pin 500. That is to say, the setting of the sliding groove 501 on the pin 500 and the sliding block 203 inside the mounting housing 200 improves the stability of the connection between the pin 500 and the mounting housing 200 and makes the movement of the pin 500 along the length of the mounting housing 200 smoother.

[0031] In some embodiments, a friction layer is provided at the end of the pin 500 that abuts against the valve stem of the emergency drain valve body 100.

[0032] In the above embodiments, the friction layer can be made of materials such as rubber, in order to increase the friction between the pin 500 and the valve stem of the emergency drain valve body 100, and further improve the restriction of the pin 500 on the emergency drain valve body 100 it abuts against.

[0033] In some embodiments, reference Figure 1 and Figure 4 In this application, a bushing 601 is rotatably mounted on the output shaft of the electric actuator 600; wherein, the bushing 601 is connected to the output shaft of the electric actuator 600 via a bearing.

[0034] In addition, both ends of the mounting housing 200 are detachably connected to the housing and bushing 601 of the emergency drain valve body 100 respectively by fastening bolts 700.

[0035] In the above embodiments, threaded holes can be provided on both the emergency drain valve body 100 and the bushing 601, while threaded through holes are provided at both ends of the mounting housing 200. A fastening bolt 700 passes through the threaded through hole at one end of the mounting housing 200 and is screwed into the threaded hole on the emergency drain valve body 100, thus achieving a fixed connection between one end of the mounting housing 200 and the emergency drain valve body 100. Similarly, a fastening bolt 700 passes through the threaded through hole at the other end of the mounting housing 200 and is screwed into the threaded hole on the bushing 601, thus achieving a fixed connection between the other end of the mounting housing 200 and the bushing 601. The method of connecting both ends of the mounting housing 200 to the emergency drain valve body 100 and the bushing 601 via fastening bolts 700 facilitates the installation and disassembly of the mounting housing 200 to the emergency drain valve body 100 and the bushing 601, thereby improving the convenience of installing and disassembling the mounting housing 200.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A safety device for an emergency drain valve of an indirect cooling tower, characterized in that, include: An emergency drain valve body (100) is installed on the inlet and return water pipes of the indirect cooling tower, and a safety hole (101) is provided on the emergency drain valve body (100). A columnar mounting housing (200) is disposed on the housing of the emergency drain valve body (100), and a threaded push rod (300) is rotatably disposed therein. A slider (400) capable of moving along the length direction of the threaded push rod (300) is threaded on the threaded push rod (300), and one end of the slider (400) away from the emergency drain valve body (100) passes through the mounting housing (200). A pin (500) is fixedly connected at one end to the slider (400), and its other end slides through the mounting housing (200) and extends into the safety hole (101) to abut against the valve stem inside the emergency drain valve body (100). An electric actuator (600) is provided, the output shaft of which is connected to one end of the threaded push rod (300) that passes through the mounting housing (200), for driving the threaded push rod (300) to rotate within the mounting housing (200).

2. The safety device for an emergency drain valve of an indirect cooling tower according to claim 1, characterized in that, The mounting housing (200) has an observation through hole (201) along its length.

3. The safety device for an emergency drain valve of an indirect cooling tower according to claim 1, characterized in that, The length of the threaded section of the threaded push rod (300) is greater than the insertion and extraction distance of the pin (500).

4. The safety device for an emergency drain valve of an indirect cooling tower according to claim 1, characterized in that, A limit block (401) is provided at the bottom of the slider (400). The mounting housing (200) has a limiting groove (202) extending along its own length direction. The limiting block (401) is adapted to the limiting groove (202) and its bottom is embedded in the limiting groove (202) and can slide along the length direction of the limiting groove (202).

5. The safety device for the emergency drain valve of the indirect cooling tower according to claim 1, characterized in that, The pin (500) has a sliding groove (501) along its length. The inner wall of the mounting housing (200) is provided with a sliding block (203) that is adapted to the sliding groove (501). The sliding block (203) is embedded in the sliding groove (501) and can slide along the length direction of the sliding groove (501).

6. The safety device for an emergency drain valve of an indirect cooling tower according to claim 1, wherein A friction layer is provided at the end of the pin (500) that abuts against the valve stem of the emergency drain valve body (100).

7. The safety device for an emergency drain valve of an indirect cooling tower according to any one of claims 1 to 6, characterized in that, A bushing (601) is rotatably mounted on the output shaft of the electric actuator (600). Both ends of the mounting housing (200) are detachably connected to the housing of the emergency drain valve body (100) and the bushing (601) respectively by fastening bolts (700).

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