Pressure relief safety device

Abstract

The utility model discloses a pressure relief safety device, and belongs to the technical field of air separation equipment. The device is connected with the top of a pump box and comprises a cylinder body, a flange, a flange cover and a fixing pin, the lower end of the barrel is fixed on a top panel of the pump box, and a flange is fixed at the upper end of the barrel; fixing pins are fixed in fixing holes in the periphery of the flange, and the fixing pins are vertically arranged upwards; fixing pins penetrate through holes in the periphery of the flange cover, the flange cover is arranged above the flange, and the flange cover can move up and down in the arrangement direction of the fixing pins; the flange cover is a flange without a central hole, so that the center of the flange cover covers the cross section of the cylinder body; the inner side of the joint of the flange and the flange cover is provided with a cutting notch used for containing a sealing ring, and when the safety device is in a closed state, the flange and the flange cover are connected in a sealed mode. The device is simple in structure, low in manufacturing cost, convenient to use, safe and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of air separation equipment, and in particular relates to a pressure relief safety device. Background Art

[0002] When the air separation equipment is in operation, there may be leakage between the valve and the pipeline, resulting in leakage of process gas. The safety valve is a special invention, and its opening and closing parts are usually in a normally closed state. When the medium pressure in the equipment or pipeline rises above the specified value, the safety valve will automatically open and discharge part of the medium to the outside of the system to prevent the pressure in the pipeline or equipment from exceeding the specified value, which helps to protect the system from damage caused by excessive pressure. Therefore, it is urgent to set up a pressure relief safety device for the expander pump box in the air separation equipment. Utility Model Content

[0003] The utility model aims to solve the deficiencies in the prior art and provide a pressure relief safety valve.

[0004] The specific technical solutions adopted by this utility model are as follows:

[0005] The utility model provides a pressure relief safety device, which is connected to the top of a pump box and comprises a cylinder, a flange, a flange cover and a fixing pin; the lower end of the cylinder is fixed on the top panel of the pump box, and the upper end of the cylinder is fixed with a flange; fixing pins are fixed in fixing holes around the flange, and the fixing pins are vertically arranged upward; holes around the flange cover pass through the fixing pins and are arranged above the flange, and the flange cover can move up and down along the setting direction of the fixing pin; the flange cover is a flange without a center hole, so the center of the flange cover covers the cross section of the cylinder; a notch for placing a sealing ring is provided on the inner side of the connection between the flange and the flange cover, and when the safety device is in a closed state, the flange and the flange cover are sealed and connected.

[0006] Preferably, according to the pressure calculation formula P=F / S, where F represents the pressure acting on the surface of the object and S is the force-bearing area, the weight of the flange cover actually required is designed so that when the pressure in the pump box is greater than the design value, the flange cover will be lifted up.

[0007] Preferably, the cylinder is a seamless tube.

[0008] Preferably, the lower end of the cylinder is fixed to the top panel of the pump box by welding.

[0009] Preferably, the bottom of the fixing pin is fixed in the fixing hole around the flange by welding.

[0010] Preferably, the connection between the cylinder and the flange adopts 4-φ8×30 sealing welding, wherein the number of welds is 4, the diameter of the weld is 8 mm, and the length of the weld is 30 mm.

[0011] Preferably, connecting pieces are welded on both sides of the flange, and rainproof protective covers are fixed on the connecting pieces.

[0012] Preferably, the contact surface roughness between the flange and the flange cover is set to Ra6.3.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The weight of the flange cover in the pressure relief safety device provided by the utility model can be selected with reference to the pressure in the pump box. The pressure relief safety device only discharges the pressure in the pump box that is higher than the standard. When the pressure in the pump box reaches the normal operating pressure, it will automatically close, thus avoiding the interruption of production and waste caused by having to discharge all the gas due to overpressure in the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of the pressure relief safety device provided by the utility model;

[0016] Figure 2 A schematic diagram of the installation of the pressure relief safety device provided by the utility model;

[0017] Figure 3 A top view of the pressure relief safety device provided by the utility model;

[0018] Figure 4 for Figure 2 A partial enlarged view of the Y position in the middle;

[0019] In the figure: cylinder 1, flange 2, flange cover 3, sealing ring 4, rain protection cover 5, connecting piece 6, fixing pin 7. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below. The technical features in each embodiment of the utility model can be combined accordingly without conflicting with each other.

[0021] like Figure 1 and Figure 2As shown, as a preferred embodiment of the utility model, this embodiment provides a pressure relief safety device, which is connected to the top of the pump box and includes a cylinder 1, a flange 2, a flange cover 3 and a fixing pin 7.

[0022] In the device provided by the utility model, the lower end of the cylinder 1 is fixed to the opening of the top panel of the pump box by welding, and the sealing welding process parameters are 4-φ8×30, wherein the number of welds is 4, the diameter of the weld is 8mm, and the length of the weld is 30mm. In order to avoid leakage of process gas, the cylinder 1 adopts a seamless pipe.

[0023] In the device provided by the utility model, a flange 2 is fixed to the upper end of the cylinder 1. The flange is usually a disc with multiple fixing holes, which is used to connect pipes or equipment. The connection between the cylinder 1 and the flange 2 is sealed by welding. As mentioned above, the sealing welding process parameters are 4-φ8×30, wherein the number of welds is 4, the diameter of the weld is 8mm, and the length of the weld is 30mm. Of course, those skilled in the art can also select appropriate welding parameters according to actual working conditions.

[0024] like Figure 4 As shown, a fixing pin 7 is fixed in the fixing holes around the flange 2, and the fixing pin 7 is arranged vertically upward. The bottom of the fixing pin 7 is fixed in the fixing holes around the flange 2 by welding. The flange cover is also called a blind flange or a blind plate. It is a flange without a center hole and is used to close the end of the pipeline. The main function of the flange cover is to prevent the fluid in the pipeline from flowing out.

[0025] In the device provided by the utility model, the holes around the flange cover 3 pass through the fixing pin 7 and are arranged above the flange 2. The flange cover 3 can move up and down along the setting direction of the fixing pin 7. Since the flange cover 3 is a flange without a center hole, the center of the flange cover 3 covers the cross section of the cylinder 1; a notch for placing the sealing ring 4 is provided on the inner side of the connection between the flange 2 and the flange cover 3, and when the safety device is in the closed state, the flange 2 and the flange cover 3 are sealed and connected.

[0026] In order to ensure the sealing performance and connection reliability between the flange 2 and the flange cover 3, the contact surface roughness between the flange 2 and the flange cover 3 is set to Ra6.3 in this embodiment. Of course, those skilled in the art can also set appropriate parameters according to actual working conditions.

[0027] According to the pressure calculation formula P = F / S, where F represents the pressure acting on the surface of the object, and S is the force-bearing area, the actual weight of the flange cover 3 is designed so that when the pressure in the pump box is greater than the design value, the flange cover 3 will be lifted up. The fixing pin plays a fixing role. When the flange cover 3 is lifted up, the upper and lower positions of the flange and the flange cover will not change.

[0028] In actual situations, the pump box in the air separation equipment may be set outdoors. In order to prevent the equipment from being affected by weather factors, a rainproof protective cover 5 is provided on the pressure relief safety device in this embodiment. Figure 3 As shown, connectors 6 are welded on both sides of the flange 2, and the rainproof protective cover 5 is fixed on the connector 6 to cover the entire pressure relief safety device.

[0029] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A pressure relief safety device, which is connected to the top of the pump box, characterized in that: The invention comprises a cylinder (1), a flange (2), a flange cover (3) and a fixing pin (7); the lower end of the cylinder (1) is fixed on the top panel of the pump box, and the upper end of the cylinder (1) is fixed with a flange (2); a fixing pin (7) is fixed in the fixing hole around the flange (2), and the fixing pin (7) is arranged vertically upward; the hole around the flange cover (3) passes through the fixing pin (7) and is arranged above the flange (2), and the flange cover (3) can move up and down along the setting direction of the fixing pin (7); the flange cover (3) is a flange without a center hole, so the center of the flange cover (3) covers the cross section of the cylinder (1); a notch for placing a sealing ring (4) is provided on the inner side of the connection between the flange (2) and the flange cover (3), and when the safety device is in a closed state, the flange (2) and the flange cover (3) are sealed and connected.

2. The pressure relief safety device according to claim 1, characterized in that: According to the pressure calculation formula P = F / S, where F represents the pressure acting on the surface of the object and S is the force-bearing area, the weight of the flange cover (3) actually required is designed so that when the pressure in the pump box is greater than the design value, the flange cover (3) will be lifted up.

3. The pressure relief safety device according to claim 1, characterized in that: The cylinder (1) is a seamless pipe.

4. The pressure relief safety device according to claim 1, characterized in that: The lower end of the cylinder (1) is fixed to the top panel of the pump box by welding.

5. The pressure relief safety device according to claim 1, characterized in that: The bottom of the fixing pin (7) is fixed in the fixing hole around the flange (2) by welding.

6. The pressure relief safety device according to claim 1, characterized in that: The connection between the cylinder (1) and the flange (2) is achieved by 4-φ8×30 sealing welding, wherein the number of welds is 4, the diameter of the weld is 8 mm, and the length of the weld is 30 mm.

7. The pressure relief safety device according to claim 1, characterized in that: Connecting pieces (6) are welded on both sides of the flange (2), and a rainproof protective cover (5) is fixed on the connecting piece (6).

8. The pressure relief safety device according to claim 1, characterized in that: The contact surface roughness between the flange (2) and the flange cover (3) is set to Ra6.3.

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