Check valve of radiation-proof exhaust pipeline system

Abstract

The utility model discloses a check valve of an anti-radiation exhaust duct system, which is used for being fixed at an air inlet of an exhaust duct, and a fan is fixed at an air outlet of the exhaust duct. Comprising a metal shell fixed in an exhaust pipeline, a ventilation plate is fixed in the middle of the metal shell, and a plurality of ventilation holes are formed in the ventilation plate; the rotating assembly is rotationally arranged in the ventilation hole and comprises rotating plates and a rotating shaft, and the rotating plate below the rotating shaft is heavier than the rotating plate above the rotating shaft; the clamping structure is fixed to the rotating plate, the upper end and the lower end of the clamping structure both protrude out of the rotating plate, the rotating plate rotates when the fan is started, and the clamping structure fixes the position of the rotating plate when the fan is stopped. When the fan is started, the rotating plate rotates under the action of wind power, so that the ventilation holes are opened, and the air exhaust requirement is met; when the fan stops, the ventilation hole is quickly closed through the dead weight of the rotating plate and the clamping and fixing structure, and the non-return effect is achieved; the check valve does not need to be opened or closed manually, the rotating plate is driven by wind power generated by the fan to control the check valve, and labor is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust duct systems in nuclear medicine departments, in particular to a non-return valve for radiation-proof exhaust duct systems. Background Art

[0002] The exhaust systems in public medical buildings are complex, especially in the nuclear medicine department's nuclide wards, energy storage rooms and other rooms where radioactive drugs are placed. The exhaust systems in these rooms are core projects. If the exhaust does not meet the standards, it will directly affect the safety of the areas around the nuclear medicine department, the wards and the personnel in the department.

[0003] The exhaust fan of the exhaust duct system is generally installed on the roof away from the crowd, connected to the nuclear medicine department through the main duct, and then connected to various service areas, source storage, wards, etc. through complex branch pipes. According to the relevant testing requirements of hospitals, the wind speed of each air outlet cannot be less than 1m / s. At this time, the scientific setting of pipe diameter change and valve adjustment and pressure increase is more critical.

[0004] However, the traditional metal iron plate check valve is heavy, and the entire pipeline is composed of one or two metal rotating plates. The rotating plates are heavy and not very flexible, which makes it difficult for the exhaust suction in the branch pipe to open the heavy metal rotating plates, directly affecting the exhaust effect. In addition, the rotating plates and the frame are not tightly sealed, and the check effect is poor. Utility Model Content

[0005] In order to solve the technical problems that the above-mentioned metal rotating plate has a large weight, low flexibility, is not tightly sealed with the frame, and has a poor check valve effect, the utility model provides a radiation-proof exhaust duct system check valve.

[0006] To achieve this technical purpose, the utility model adopts the following scheme:

[0007] A radiation-proof exhaust duct system check valve is used to be fixed at the air inlet of the exhaust duct, and a fan is fixed at the air outlet of the exhaust duct; it includes a metal shell fixed in the exhaust duct, and also includes:

[0008] A ventilation plate is fixed in the middle of the metal shell, and a plurality of ventilation holes are opened on the ventilation plate;

[0009] A rotating assembly is rotatably arranged in the ventilation hole; the rotating assembly includes a rotating plate and a rotating shaft, and the weight of the rotating plate below the rotating shaft is greater than the weight of the rotating plate above the rotating shaft;

[0010] The clamping structure is fixed on the rotating plate. The upper end and the lower end of the clamping structure both protrude from the rotating plate. The rotating plate rotates when the fan is turned on. The clamping structure fixes the position of the rotating plate when the fan is stopped.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. Multiple ventilation holes and rotating components are set up to facilitate the rotation of the rotating plate under the action of wind when the fan is turned on, thereby opening the ventilation holes and achieving exhaust requirements;

[0013] 2. When the fan stops, the ventilation holes are quickly closed by the deadweight of the rotating plate and the clamping structure to achieve a backflow prevention effect;

[0014] 3. This device does not require manual opening or closing of the check valve. The wind force generated by the fan drives the rotating plate to rotate, thereby controlling the check valve and saving labor.

[0015] The preferred embodiment of the present utility model is:

[0016] The fixing structure includes an upper clamping block and a lower clamping block. The upper clamping block is fixed to the upper end of the outer side of the rotating plate, and abuts against the outer surface of the ventilation plate; the lower clamping block is fixed to the lower end of the inner side of the rotating plate, and abuts against the inner surface of the ventilation plate. Through the structure of the upper clamping block and the lower clamping block, the rotating plate is prevented from infinitely rotating in the ventilation hole, which affects the anti-reverse effect. When the fan is turned off, the upper clamping block cooperates with the lower clamping block to clamp the rotating plate to achieve the anti-reverse effect.

[0017] The ventilation plate, the rotating plate and the fixing structure are made of PVC material in the middle and covered with an aluminum shell on the outside; through the above structure, the material of the rotating plate is lighter and is easy to rotate under the action of the fan.

[0018] The rotating shaft of the rotating plate is arranged horizontally, and is fixed to the upper end of the inner side of the ventilation hole. Through the above structure, the rotating plate is heavy at the bottom and light at the top, and the ventilation hole can be opened and closed quickly when the fan is turned on and off.

[0019] The ventilation holes are arranged to be circular, oval or square; the shape of the ventilation holes can be set according to specific usage scenarios to meet the exhaust requirements of different scenarios.

[0020] The periphery of the rotating plate is rounded to prevent the edge of the rotating plate from colliding and getting stuck around the ventilation hole.

[0021] The upper clamping block and the lower clamping block are fan-shaped and are respectively fixed on both sides of the rotating plate, and the fan surfaces protrude from the rotating plate and abut against the inner and outer surfaces of the ventilation plate. Through the above structure, it is convenient to fix the clamping structure to the rotating plate, increase the contact surface between the upper clamping block and the lower clamping block and the ventilation plate, and make the clamping effect better.

[0022] The upper clamping block and the lower clamping block are arc-shaped, and the curvature is the same as that of the upper surface and the lower surface of the rotating plate. The upper clamping block and the lower clamping block are respectively fixed on the upper side and the lower side of the rotating plate, and their side walls are respectively abutted against the inner and outer surfaces of the ventilation plate. Through the above structure, it is convenient to fix the clamping structure to the rotating plate, increase the contact surface between the upper clamping block and the lower clamping block and the ventilation plate, and make the clamping effect better.

[0023] The upper clamping block and the lower clamping block are fixed on the rotating plate by bolts or glue; they are easy to disassemble and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view schematic diagram of an embodiment of the utility model with more ventilation holes;

[0025] Figure 2 This is a front view schematic diagram of an embodiment of the utility model with fewer ventilation holes;

[0026] Figure 3 It is a side view schematic diagram of an embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the turning plate structure of the utility model;

[0028] Figure 5 This is a schematic diagram of the fan-shaped clamping structure of the utility model;

[0029] Figure 6 This is a schematic diagram of the arc-shaped clamping structure of the utility model;

[0030] The markings in the figure are: 1, metal shell; 2, ventilation plate; 3, ventilation hole; 4, rotating plate; 41, upper clamping block; 42, rotating shaft; 43, lower clamping block. DETAILED DESCRIPTION

[0031] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific implementation methods, but the present invention is not limited thereto.

[0032] Reference Figure 1-6 The utility model provides a radiation-proof exhaust duct system check valve, which is used to be fixed at the air inlet of the exhaust duct, and a fan is fixed at the air outlet of the exhaust duct; it includes a metal shell 1 fixed in the exhaust duct, and also includes:

[0033] A ventilation plate 2 is fixed in the middle of the metal shell 1, and a plurality of ventilation holes 3 are formed on the ventilation plate 2;

[0034] A rotating assembly is rotatably arranged in the ventilation hole 3; the rotating assembly includes a rotating plate 4 and a rotating shaft 42, and the weight of the rotating plate 4 below the rotating shaft 42 is greater than the weight of the rotating plate 4 above the rotating shaft 42;

[0035] The clamping structure is fixed on the rotating plate 4. The upper end and the lower end of the clamping structure both protrude from the rotating plate 4. The rotating plate 4 rotates when the fan is turned on. The clamping structure fixes the position of the rotating plate 4 when the fan is stopped.

[0036] Through the check valve of this embodiment, a plurality of ventilation holes 3 and a rotating assembly are provided, so that when the fan is turned on, the rotating plate 4 is rotated under the action of wind force, thereby opening the ventilation holes 3 and meeting the exhaust demand; when the fan stops, the ventilation holes 3 are quickly closed by the deadweight of the rotating plate 4 and the clamping structure, thereby achieving a check effect; this device does not require manual opening or closing of the check valve, and the wind force generated by the fan drives the rotating plate 4 to rotate, thereby controlling the check valve and saving labor.

[0037] The metal shell 1 of this embodiment is rectangular, and the shape and size can be adjusted according to different projects. Preferably, the size of the ventilation plate 2 is set to 350mm*350mm*5mm. The ventilation holes 3 of this embodiment are set with reference to Figure 1-2 , Figure 1 The number of ventilation holes 3 is large and the distribution is dense, so the exhaust effect is strong. Figure 2 The number of ventilation holes 3 is small and the distribution is sparse, so the exhaust effect is weak. In actual use, the number and position of the ventilation holes 3 can be set according to specific exhaust requirements.

[0038] In this embodiment, the clamping structure includes an upper clamping block 41 and a lower clamping block 43. The upper clamping block 41 is fixed to the upper end of the outer side of the rotating plate 4 and abuts against the outer surface of the ventilation plate 2. The lower clamping block 43 is fixed to the lower end of the inner side of the rotating plate 4 and abuts against the inner surface of the ventilation plate 2. Specifically, the upper clamping block 41 is fixed to the outer side of the rotating plate 4, and its upper end protrudes from the upper end of the rotating plate 4, so as to abut against the upper side of the ventilation hole 3. The lower clamping block 43 is fixed to the inner side of the rotating plate 4, and its lower end protrudes from the lower end of the rotating plate 4, so as to abut against the lower side of the ventilation hole 3. The upper clamping block 41 and the lower clamping block 43 are fixed to the rotating plate by bolts or glue, so as to facilitate adjustment of the position of the clamping structure. At the same time, the clamping block 41 and the lower clamping block 43 are conveniently disassembled and can be reused. Through the structure of the upper clamping block 41 and the lower clamping block 43, the rotating plate 4 is prevented from infinitely rotating in the ventilation hole 3, which affects the exhaust effect and the anti-reverse effect. When the fan is turned off, the clamping structure clamps the rotating plate 4 to achieve the anti-reverse effect.

[0039] Reference Figure 5 As an option, the upper clamping block 41 and the lower clamping block 43 are set to be fan-shaped, the upper clamping block 41 is fixed to the upper end of the outer side of the rotating plate 4, and the lower clamping block 43 is fixed to the lower end of the inner side of the rotating plate 4. The fan surfaces of the upper clamping block 41 and the lower clamping block 43 protrude from the rotating plate 4 and abut against the inner and outer surfaces of the ventilation plate 2. By increasing the contact area between the upper clamping block 41, the lower clamping block 43 and the ventilation plate 2, the clamping effect is better, and the upper clamping block 41, the lower clamping block 43 and the rotating plate 4 are fixed more firmly.

[0040] Reference Figure 6As an option, the upper clamping block 41 and the lower clamping block 43 are set to be arc-shaped, the curvature of the lower surface of the upper clamping block 41 is the same as the curvature of the upper surface of the rotating plate 4, and the curvature of the upper surface of the lower clamping block 43 is the same as the curvature of the lower surface of the rotating plate (4). The upper clamping block 41 is fixed to the upper side of the rotating plate 4, and its side wall abuts against the outer surface of the ventilation plate 2. The lower clamping block 43 is fixed to the lower side of the rotating plate 4, and its side wall abuts against the inner surface of the ventilation plate 2.

[0041] In this embodiment, the ventilation hole 3 is set to be circular, oval or square, and the rotating plate 4 is consistent with the shape of the ventilation hole 3, so that the rotating plate 4 can be rotated and set in the ventilation hole 3 and can maintain good sealing. The shape of the ventilation hole can be set according to the specific usage scenario to adapt to the exhaust requirements of different scenarios.

[0042] In this embodiment, the ventilation plate 2, the rotating plate 4 and the fixing structure are made of PVC material in the middle and covered with an aluminum shell on the outside; through the above structure, the material combined with PVC and the aluminum shell is lighter, which is convenient for the rotating plate 4 to rotate under the action of the fan, and the aluminum shell has a better effect in protecting against iodine 131 radiation, avoiding the leakage of radioactive substances in the nuclear medicine department through the pipeline, and the aluminum shell is also easier to fix to the metal shell 1.

[0043] In this embodiment, the rotating shaft 42 is horizontally arranged and fixed at the upper end position of the inner side of the ventilation hole 3. Through the above structure, the rotating plate 4 is heavy at the bottom and light at the top, and the ventilation hole 3 can be opened and closed quickly when the fan is turned on and off.

[0044] In this embodiment, the periphery of the rotating plate 4 is rounded to prevent the edge of the rotating plate 4 from colliding with and getting stuck around the ventilation hole, or causing damage when the rotating plate 4 rotates.

[0045] The operating principle of the check valve in this embodiment is:

[0046] The check valve of the present embodiment is fixed at the air inlet of the exhaust duct, and the fan is generally fixed at the air outlet of the exhaust duct. When the fan is turned on, the suction generated by the fan will be transmitted to the check valve through the duct. Due to the obstruction of the fixing structure, the rotating plate 4 can only rotate counterclockwise quickly to open the vent 3, and under the action of continuous suction, the rotation angle of the rotating plate 4 remains basically fixed to achieve the exhaust demand in the room; when the fan stops, the suction in the duct disappears, the rotating plate 4 stops rotating, and due to the structure of the rotating plate 4 with heavy bottom and light top, the rotating plate 4 rotates clockwise to return to its original position, and the fixing structure fixes the position of the rotating plate 4 to achieve the effect of the check valve, isolating the heavily polluted area from spreading to other areas.

[0047] Finally, it should be noted that the above-listed examples are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and modifications fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.

Claims

1. A radiation-proof exhaust duct system check valve, which is used to be fixed at the air inlet of the exhaust duct, and a fan is fixed at the air outlet of the exhaust duct; It comprises a metal casing (1) fixed in an exhaust duct, characterized in that: Also includes: A ventilation plate (2) is fixed in the middle of the metal shell (1), and a plurality of ventilation holes (3) are formed on the ventilation plate (2); A rotating assembly is rotatably arranged in the ventilation hole (3); the rotating assembly comprises a rotating plate (4) and a rotating shaft (42), and the weight of the rotating plate (4) below the rotating shaft (42) is greater than the weight of the rotating plate (4) above the rotating shaft (42); The clamping structure is fixed on the rotating plate (4), and the upper end and the lower end of the clamping structure both protrude from the rotating plate (4).

2. The radiation-proof exhaust duct system check valve according to claim 1 is characterized in that: The clamping structure comprises an upper clamping block (41) and a lower clamping block (43); the upper clamping block (41) is fixed to the upper end of the outer side of the rotating plate (4) and abuts against the outer surface of the ventilation plate (2); and the lower clamping block (43) is fixed to the lower end of the inner side of the rotating plate (4) and abuts against the inner surface of the ventilation plate (2).

3. The radiation-proof exhaust duct system check valve according to claim 1 is characterized by: The ventilation plate (2), the rotating plate (4) and the fixing structure are made of PVC material in the middle and are covered with an aluminum shell on the outside.

4. The radiation-proof exhaust duct system check valve according to claim 1, characterized in that: The rotating shaft (42) of the rotating plate (4) is arranged horizontally and is fixed to the upper end of the inner side of the ventilation hole (3).

5. The radiation-proof exhaust duct system check valve according to claim 1, characterized in that: The ventilation hole (3) is configured to be circular, oval or square, and the rotating plate (4) has the same shape as the ventilation hole.

6. The radiation-proof exhaust duct system check valve according to claim 1, characterized in that: The periphery of the rotating plate (4) is rounded.

7. The radiation-proof exhaust duct system check valve according to claim 2, characterized in that: The upper clamping block (41) and the lower clamping block (43) are fan-shaped and are respectively fixed on both sides of the rotating plate (4). The fan surfaces protrude from the rotating plate (4) and abut against the inner and outer surfaces of the ventilation plate (2).

8. The radiation-proof exhaust duct system check valve according to claim 2, characterized in that: The upper clamping block (41) and the lower clamping block (43) are arc-shaped, and the curvature is respectively the same as the curvature of the upper surface and the lower surface of the rotating plate (4). The upper clamping block (41) and the lower clamping block (43) are respectively fixed on the upper side and the lower side of the rotating plate (4), and their side walls are respectively in contact with the inner and outer surfaces of the ventilation plate (2).

9. The radiation-proof exhaust duct system check valve according to claim 2, characterized in that: The upper clamping block (41) and the lower clamping block (43) are fixed on the rotating plate (4) by bolts or glue.

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