A pressure relief valve that can precisely control the release pressure

Abstract

This invention provides a pressure relief valve that can precisely control the release pressure. It uses the opening and closing of a pressure switch as a control signal to precisely control the release pressure; it uses the clamping force of a spring in a clamping linkage device to solve the sealing leakage problem, eliminating the need for additional counterweights; it uses a cam mechanism to pull out the clamping linkage device, causing the rotating cover to open rapidly under the action of flue gas pressure; this pressure relief valve is lightweight, leak-free, and has precisely controllable release pressure, reducing costs and installation difficulty, and improving the safety performance of the flue gas system.

Description

Technical Field

[0001] This utility model belongs to the field of industrial furnace flue gas treatment engineering and relates to overpressure protection technology, specifically a pressure relief valve that can precisely control the pressure release. Background Technology

[0002] Industrial furnace flue gas treatment mainly includes dust removal, desulfurization, and denitrification. During the flue gas treatment process, pressure changes significantly impact the safety of equipment and flue ducts, especially during positive pressure operation. Excessive flue gas pressure can lead to increased leakage in the flue gas system, potentially causing damage to flexible connections and even equipment and flue ducts. Therefore, a certain number of relief valves are typically installed in the equipment and flue ducts of flue gas treatment systems to ensure the safety of the system.

[0003] Conventional pressure relief valves typically employ a mechanical structure, utilizing a counterweight to adjust the opening pressure. However, in practical applications, the counterweight results in a significant weight for the valve, impacting installation and operational safety. When the pressure approaches the set pressure, the reduced sealing pressure can lead to premature gas leakage, affecting operational safety and the working environment. Furthermore, issues such as corrosion and gasket adhesion can cause the actual opening pressure to deviate from the set value, making precise control of the opening pressure impossible. Utility Model Content

[0004] To address the shortcomings of conventional flue gas relief valves during use, this invention provides a pressure relief valve that can precisely control the relief pressure. It utilizes the opening and closing of a pressure switch as a control signal to precisely control the relief pressure; it solves the sealing leakage problem by using the clamping force of a spring in a clamping linkage device, eliminating the need for additional counterweights; and it uses a cam mechanism to pull out the clamping linkage device, causing the rotating cover to open rapidly under flue gas pressure. This pressure relief valve is lightweight, leak-free, and provides precise pressure control, reducing costs and installation difficulty, and improving the safety performance of the flue gas system.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A pressure relief valve capable of precisely controlling the pressure release includes:

[0007] The pressure relief cylinder has a flue gas side facility connected to one end and a rotating cover plate installed at the other end.

[0008] A rotating cover plate, rotatably connected to the pressure relief cylinder, is configured to be an openable component that covers and seals the other end port of the pressure relief cylinder during pressure relief.

[0009] A sealing gasket is placed between the rotating cover plate and the other end of the pressure relief cylinder to seal the area between the rotating cover plate and the pressure relief cylinder when the flue gas pressure is normal.

[0010] The clamping linkage device is rotatably connected to the pressure relief cylinder. It has a clamping end that can be separated from the rotating cover plate for clamping when the flue gas pressure is normal, or for releasing the clamping force on the rotating cover plate in a controlled manner under overpressure conditions.

[0011] The pressure-conducting pipe is connected at one end to the pressure relief cylinder and at the other end to the pressure switch. The on / off signal of the pressure switch is connected to the contactor.

[0012] The contactor has an external power supply at one end and is connected to the drive motor at the other end.

[0013] The cam is connected to the output shaft of the drive motor, and its edge is in contact with the clamping linkage device. It is used to drive the cam to rotate the clamping linkage device by the drive motor.

[0014] Furthermore, the pressure relief cylinder includes a pressure relief pipe, a clamping rotating bracket, a sealing flange, a rotating bracket, a rotating shaft C, and a rotating shaft B; the pressure relief pipe is a hollow pipe, one end of which is connected to the flue gas side facility, and the other end is connected to the hollow annular sealing flange; the sealing gasket is a hollow annular structure adapted to the sealing flange and is fixedly connected to the sealing flange; the clamping rotating bracket and the rotating bracket are welded to opposite sides of the pressure relief pipe, respectively, and the rotating shaft B is fixedly mounted on the clamping rotating bracket, and the rotating shaft C is fixedly mounted on the rotating bracket; the rotating shaft B is used to rotatably connect to the clamping linkage device, and the rotating shaft C is used to rotatably connect to the rotating cover plate; a connecting hole is opened on the pressure relief pipe, and a pressure guiding pipe is connected at the connecting hole.

[0015] Furthermore, the rotating cover plate includes a sealing top cover, a reinforcing plate assembly, and a support shaft assembly; the sealing top cover is a solid plate structure adapted to the shape of the sealing flange, and the reinforcing plate assembly is fixedly connected to its top; the reinforcing plate assembly extends outward from the sealing top cover along the horizontal plane, and the portion extending out of the sealing top cover is connected to the support shaft assembly, which is hinged to the rotating shaft C.

[0016] Furthermore, the reinforcing plate assembly includes two parallel transverse reinforcing plates and several longitudinal reinforcing plates, with each longitudinal reinforcing plate distributed sequentially at intervals along the length of the transverse reinforcing plates, and each longitudinal reinforcing plate having its two ends vertically fixedly connected between the two transverse reinforcing plates; the support shaft assembly includes two support shafts; two insertion holes are provided on the longitudinal reinforcing plate at the far end, and a support shaft is vertically connected to each insertion hole; the lower ends of the two support shafts are provided with shaft holes, and the two shafts pass through the shaft holes and are hinged to the rotating shaft C of the pressure relief cylinder.

[0017] Furthermore, the clamping linkage device includes two symmetrically arranged sets of adjustment mechanisms and a T-shaped linkage rod. Each set of adjustment mechanisms includes a clamping support, a bearing, a rotating shaft A, a sliding rod, a bearing bracket, a clamping spring, and a pressure adjusting nut A. The sliding rod passes through a through hole in the lower part of the rod body and is hinged to the rotating shaft B of the pressure relief cylinder. One end of the bearing bracket is slidably sleeved on the sliding rod, and the top of the sliding rod is threadedly connected to the pressure adjusting nut A. The clamping spring is sleeved on the sliding rod and press-fitted between the bearing bracket and the pressure adjusting nut A. The other end of the bearing bracket extends outward and is connected to a bearing, which is rotatably sleeved on the rotating shaft A. The rotating shaft A is fixedly installed on the clamping support. The bearing, rotating shaft A, and clamping support together form a clamping end that presses against the transverse reinforcing plate of the rotating cover. The lower ends of the sliding rods of the two sets of adjustment mechanisms are fixedly connected to the T-shaped linkage rod as a whole, and the T-shaped linkage rod abuts against the cam.

[0018] Furthermore, the rotating cover also includes two pressure adjusting nuts B and two limiting springs; a limiting spring is fitted on the rod of each support shaft, and the top of the support shaft passes through the insertion hole through the longitudinal reinforcing plate and the protruding part is connected to the pressure adjusting nut B by thread. The limiting spring is pressed between the limiting protrusion on the support shaft and the bottom surface of the longitudinal reinforcing plate, so as to adjust the clamping amount of the rotating cover by turning the pressure adjusting nut B.

[0019] The beneficial effects of this utility model include:

[0020] It utilizes a pressure-conducting pipe to transmit the flue gas pressure in the pressure relief cylinder to a pressure switch in real time. The on / off signal of the pressure switch controls the contactor and drive motor. Combined with the reliable linkage between the cam and the clamping linkage device, precise control of the relief pressure is achieved, avoiding the opening pressure deviation problem caused by corrosion and adhesion in conventional mechanical counterweight structures. The clamping spring and pressure adjusting nut A in the clamping linkage device provide a stable and adjustable clamping force for the rotating cover. Simultaneously, the limit spring of the rotating cover and the pressure adjusting nut B help balance the clamping force, ensuring a tight seal between the sealing gasket and the sealing cover. The tight fit solves the sealing leakage problem when the pressure approaches the set value, ensuring operational safety and environmental protection. The overall structure requires no counterweight design, and the function is achieved through lightweight sliding rods, bearing supports, cams and other components, which greatly reduces the overall weight of the pressure relief valve, making it easier to install and improving safety. The stable transmission of the T-shaped linkage rod and cam, as well as the reasonable setting of each rotating shaft, ensures that the rotating cover can quickly open to release flue gas when overpressure occurs, improving the safety performance of the flue gas system, while reducing equipment costs and installation difficulty. It is suitable for overpressure protection scenarios in industrial furnace flue gas treatment. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention in its normal state;

[0022] Figure 2 This is a top view of the present invention in its normal state;

[0023] Figure 3 This is a schematic diagram of the present invention in the discharge state;

[0024] Figure 4 yes Figure 1 AA view;

[0025] Figure 5 yes Figure 1 BB view.

[0026] In the diagram: 1-Pressure clamping linkage device, 2-Rotating cover plate, 3-Sealing gasket, 4-Pressure relief cylinder, 5-Drive motor, 6-Cam, 7-Pressure guide pipe, 8-Pressure switch, 9-Contaminator, 101-Pressure adjusting nut A, 102-Pressure clamping spring, 103-Bearing bracket, 104-Sliding rod, 105-T-type linkage rod, 106-Rotating shaft A, 107-Bearing, 108-Pressure clamping support, 201-Transverse reinforcing plate, 202-Vertical reinforcing plate, 203-Pressure adjusting nut B, 204-Sealing top cover, 205-Limit spring, 206-Support shaft, 401-Pressure relief pipe, 402-Pressure clamping rotating bracket, 403-Sealing flange, 404-Rotating bracket, 405-Rotating shaft C, 406-Rotating shaft B. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "A" and "B" are used only to distinguish components and should not be construed as indicating or implying relative importance. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] This utility model provides a pressure relief valve that can precisely control the pressure release, including: a clamping linkage device 1, a rotating cover plate 2, a sealing gasket 3, a pressure relief cylinder 4, a drive motor 5, a cam 6, a pressure guide pipe 7, a pressure switch 8, and a contactor 9.

[0030] refer to Figure 1 , Figure 2 , Figure 4 and Figure 5The clamping linkage device 1 includes two pressure adjusting nuts A101, two clamping springs 102, two bearing brackets 103, two sliding rods 104, one T-shaped linkage rod 105, two rotating shafts A106, two bearings 107, and two clamping supports 108.

[0031] The rotating cover 2 includes two parallel transverse reinforcing plates 201, several longitudinal reinforcing plates 202, two pressure adjusting nuts B203, a sealing cover 204, and two limit springs 205;

[0032] The pressure relief cylinder 4 includes a pressure relief pipe 401, a clamping rotating bracket 402, a sealing flange 403, a rotating bracket 404, a rotating shaft C405, and a rotating shaft B406.

[0033] Both sliding rods 104 of the clamping linkage device 1 are passed through through holes in the lower part of the rod body and hinged to the rotating shaft B406 of the pressure relief cylinder 4; one end of the bearing bracket 103 is slidably sleeved on the sliding rod 104, and the top of the sliding rod 104 is connected to the pressure adjusting nut A101 by a thread; the clamping spring 102 is sleeved on the sliding rod 104 and pressed between the bearing bracket 103 and the pressure adjusting nut A101; the other end of the bearing bracket 103 extends outward and is connected to a bearing 107, which is rotatably sleeved on the rotating shaft A106, and the rotating shaft A106 is fixedly installed on the clamping support 108; the bearing 107, the rotating shaft A106, and the clamping support 108 form a clamping end that presses against the transverse reinforcing plate 201 of the rotating cover plate 2; the lower ends of the two sliding rods 104 are welded to the T-shaped linkage rod 105 as a whole, and the T-shaped linkage rod 105 abuts against the cam 6. The entire clamping linkage device 1 can rotate around the rotating shaft B406.

[0034] The sealing cover 204 of the rotating cover plate 2 is a solid plate structure adapted to the shape of the sealing flange 403. Each longitudinal reinforcing plate 202 is distributed sequentially at intervals along the length of the transverse reinforcing plates 201, and the two ends of each longitudinal reinforcing plate 202 are vertically welded between two transverse reinforcing plates 201 to form a reinforcing plate assembly. The reinforcing plate assembly is welded to the top of the sealing cover 204. The reinforcing plate assembly extends outward from the horizontal plane of the sealing cover 204. Two insertion holes are provided on the longitudinal reinforcing plate 202 at the very end of the extension, and a support shaft 206 is vertically connected to each insertion hole. Each support shaft 206 has a shaft hole at its lower end, through which both shafts pass and are hinged to the rotating shaft C405 of the pressure relief cylinder 4. A limiting spring 205 is fitted onto the shaft of each support shaft 206. The top of the support shaft 206 extends through a insertion hole into the longitudinal reinforcing plate 202, and the extended portion is threadedly connected to a pressure adjusting nut B203. The limiting spring 205 is press-fitted between a limiting protrusion on the support shaft 206 and the bottom surface of the longitudinal reinforcing plate 202, allowing adjustment of the downward pressing amount of the rotating cover plate 2 by tightening the pressure adjusting nut B203, thereby maintaining balance with the pressing force of the clamping spring 102. The rotating cover plate 2 can rotate around the rotating shaft C405.

[0035] The pressure relief pipe 401 of the pressure relief cylinder 4 is a hollow steel pipe, one end of which is connected to the flue gas side facility, and the other end is connected to the hollow annular sealing flange 403. The sealing gasket 3 is a hollow annular structure adapted to the sealing flange 403 and is fixedly connected to the sealing flange 403. The two together form a sealing structure. The pressure relief pipe 401 has a clamping rotating bracket 402 and a rotating bracket 404 welded on opposite sides. A rotating shaft B406 is fixedly mounted on the clamping rotating bracket 402, and a rotating shaft C405 is fixedly mounted on the rotating bracket 404. The rotating shaft B406 is used to rotately connect with the clamping linkage device 1, and the rotating shaft C405 is used to rotately connect with the rotating cover plate 2. A connecting hole is opened on the body of the pressure relief pipe 401, and the connecting hole is connected to the pressure guide pipe 7.

[0036] One end of the pressure guide pipe 7 is connected to the pressure relief pipe 401, and the other end is connected to the pressure switch 8. The on / off signal of the pressure switch 8 is connected to the contactor 9. One end of the contactor 9 is connected to an external power supply, and the other end is connected to the drive motor 5. The output shaft of the drive motor 5 is connected to the cam 6. The edge of the cam 6 is in contact with the T-shaped linkage rod 105 of the clamping linkage device 1, which is used to drive the cam 6 to rotate the clamping linkage device 1 through the drive motor 5.

[0037] The sealing cover 204 of the rotating cover plate 2, together with the sealing flange 403 and sealing gasket 3 of the pressure relief cylinder 4, form a sealing structure. (Reference) Figure 1When the flue gas pressure is below the set pressure, the clamping linkage device 1, under the action of the clamping spring 102, generates a downward thrust on the bearing bracket 103. This thrust is then applied to the transverse reinforcing plate 201 of the rotating cover plate 2 via the clamping end composed of the bearing 107, rotating shaft A106, and clamping support 108, providing clamping force for sealing. Simultaneously, the transverse reinforcing plate 201 generates an upward reaction force on the bearing bracket 103. When the downward thrust of the clamping spring 102 and the upward reaction force of the transverse reinforcing plate 201 are balanced, the position of the bearing bracket 103 on the sliding rod 104 is fixed. By adjusting the pressure adjusting nut A101 to change the spring compression, the clamping force can be adjusted to ensure sufficient pressure and prevent flue gas leakage during normal use. At the same time, the downward clamping force on the other side of the rotating cover plate 2 can be adjusted by adjusting the pressure adjusting nut B203 to maintain a balanced clamping force. At this time, the pressure switch 8 connected through the pressure guide tube 7 is in the open state, the contactor 9 is disconnected, the drive motor 5 is in the stopped state, and the bottom end of the cam 6 abuts against the T-shaped linkage rod 105.

[0038] refer to Figure 3 When the flue gas pressure exceeds the design value, the pressure switch 8 is turned on, the control contactor 9 is turned on, the drive motor 5 is energized and drives the cam 6 to rotate. The cam 6 pushes the T-shaped linkage rod 105, which drives the clamping device 1 to rotate around the rotating shaft B406. This pulls the clamping end composed of bearing 107, rotating shaft A106 and clamping support 108 to detach from the rotating cover plate 2. The rotating cover plate 2, which loses its clamping force, rotates around the rotating shaft C405 under the action of flue gas pressure, thereby allowing the flue gas to be released from the pressure relief pipe 401.

[0039] When a pressure relief occurs, the pressure relief signal can be transmitted to the control room or on-site alarm through the auxiliary contact of contactor 9 to warn and remind the operator.

[0040] This pressure relief valve uses a pressure switch as the pressure relief signal, allowing for precise control of the pressure relief; it uses a clamping linkage device to tighten the sealing surface, solving the problem of sealing leakage; it uses a cam to drive a T-shaped linkage rod to trigger pressure relief, which is safe and reliable; and it requires no counterweight, significantly reducing the overall weight.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A pressure relief valve which can accurately control a relief pressure, characterized by, include: The pressure relief cylinder (4) has one end port connected to the flue gas side facility and the other end port equipped with a rotating cover plate (2). A rotating cover (2) is rotatably connected to the pressure relief cylinder (4), and is configured to be an openable component that covers and seals the other end of the pressure relief cylinder (4) during pressure relief; A sealing gasket (3) is provided between the rotating cover plate (2) and the other end port of the pressure relief cylinder (4) for sealing between the rotating cover plate (2) and the pressure relief cylinder (4) when the flue gas pressure is normal; The clamping linkage device (1) is rotatably connected to the pressure relief cylinder (4). It has a clamping end that can be separated from the rotating cover plate (2) for clamping the rotating cover plate (2) when the flue gas pressure is normal, or for releasing the clamping force on the rotating cover plate (2) under overpressure conditions. The pressure guide pipe (7) is connected at one end to the pressure relief cylinder (4) and at the other end to the pressure switch (8). The on / off signal of the pressure switch (8) is connected to the contactor (9). The contactor (9) has an external power supply at one end and is connected to the drive motor (5) at the other end; The cam (6) is connected to the output shaft of the drive motor (5) and its edge is in contact with the clamping linkage device (1) for driving the cam (6) to rotate the clamping linkage device (1) by the drive motor (5).

2. A pressure relief valve according to claim 1, wherein The pressure relief cylinder (4) includes a pressure relief pipe (401), a clamping rotating bracket (402), a sealing flange (403), a rotating bracket (404), a rotating shaft C (405), and a rotating shaft B (406); the pressure relief pipe (401) is a hollow pipe, one end of which is connected to the flue gas side facility, and the other end is connected to the hollow annular sealing flange (403); the sealing gasket (3) is a hollow annular structure adapted to the sealing flange (403) and is fixedly connected to the sealing flange (403); the pressure relief pipe ( 401) A clamping rotating bracket (402) and a rotating bracket (404) are welded on opposite sides respectively. A rotating shaft B (406) is fixedly mounted on the clamping rotating bracket (402), and a rotating shaft C (405) is fixedly mounted on the rotating bracket (404). The rotating shaft B (406) is used to rotately connect with the clamping linkage device (1), and the rotating shaft C (405) is used to rotately connect with the rotating cover plate (2). A connecting hole is opened on the body of the pressure relief pipe (401), and a pressure guiding pipe (7) is connected at the connecting hole.

3. A pressure relief valve according to claim 2, wherein The rotating cover (2) includes a sealing cover (204), a reinforcing plate assembly, and a support shaft assembly; the sealing cover (204) is a solid plate structure adapted to the shape of the sealing flange (403), and the reinforcing plate assembly is fixedly connected to its top; the reinforcing plate assembly extends outward from the sealing cover (204) along the horizontal plane, and the part of the reinforcing plate assembly extending outward from the sealing cover (204) is connected to the support shaft assembly, and the support shaft assembly is hinged to the rotating shaft C (405).

4. A pressure relief valve according to claim 3, wherein The reinforcing plate assembly includes two parallel transverse reinforcing plates (201) and several longitudinal reinforcing plates (202). Each longitudinal reinforcing plate (202) is distributed sequentially at intervals along the length direction of the transverse reinforcing plates (201), and the two ends of each longitudinal reinforcing plate (202) are vertically fixedly connected between the two transverse reinforcing plates (201). The support shaft assembly includes two support shafts (206). Two insertion holes are provided on the longitudinal reinforcing plate (202) at the far end, and a support shaft (206) is vertically connected in each insertion hole. The lower ends of the two support shafts (206) are provided with shaft holes, and the two shafts pass through the shaft holes and are hinged to the rotating shaft C (405) of the pressure relief cylinder (4).

5. A pressure relief valve according to claim 4, wherein The clamping linkage device (1) includes two sets of symmetrically arranged adjustment mechanisms and a T-shaped linkage rod (105). Each set of adjustment mechanisms includes a clamping support (108), a bearing (107), a rotating shaft A (106), a sliding rod (104), a bearing bracket (103), a clamping spring (102), and a pressure adjusting nut A (101). The sliding rod (104) is inserted through a through hole at the bottom of the rod and hinged to the rotating shaft B (406) of the pressure relief cylinder (4). One end of the bearing bracket (103) is slidably sleeved on the sliding rod (104), and the top of the sliding rod (104) is threadedly connected to the pressure adjusting nut A (101). The clamping spring (102) is sleeved on the bearing bracket (105). The sliding rod (104) is pressed between the bearing bracket (103) and the pressure adjusting nut A (101); the other end of the bearing bracket (103) extends outward and is connected to a bearing (107), the bearing (107) is rotatably sleeved on the rotating shaft A (106), and the rotating shaft A (106) is fixedly installed on the pressing support (108); the bearing (107), the rotating shaft A (106), and the pressing support (108) form a pressing end that presses on the transverse reinforcing plate (201) of the rotating cover plate (2); the lower end of the sliding rod (104) of the two sets of adjustment mechanisms is fixedly connected to the T-type linkage rod (105) as a whole, and the T-type linkage rod (105) abuts against the cam (6).

6. A pressure relief valve according to claim 5, wherein The rotating cover (2) also includes two pressure adjusting nuts B (203) and two limiting springs (205); a limiting spring (205) is fitted on the rod of each support shaft (206). The top of the support shaft (206) passes through the insertion hole of the longitudinal reinforcing plate (202) and the part that passes through is connected to the pressure adjusting nut B (203) by thread. The limiting spring (205) is pressed between the limiting protrusion on the support shaft (206) and the bottom surface of the longitudinal reinforcing plate (202) to adjust the clamping amount of the rotating cover (2) by turning the pressure adjusting nut B (203).

Images