A small isolation air valve

Abstract

The utility model discloses a small isolation air valve, including an electric device, a valve body, a valve shaft, and a valve plate. The valve body is a rectangular frame structure, which is connected in sequence by an upper frame, a left frame, a right frame, and a lower frame. An electric bracket is installed on the top of the upper frame to carry the electric device. The transmission shaft of the electric device is connected to one end of the valve shaft through a coupling to drive the valve shaft to rotate. After passing through the left frame, the valve shaft extends horizontally into the interior of the right frame, and the valve plate is fixed to the valve shaft by the countersunk screws on the top. A detachable sealing strip is installed on the contact surface between the valve plate and the valve shaft. The sealing strip is distributed on the edges of both sides of the valve plate, the bottom edge and the lower side of the valve shaft to ensure that the valve plate is tightly sealed when it is closed. The utility model realizes the function of rapid replacement of the sealing ring, and can ensure that the operator can quickly and conveniently complete the replacement task even in a small space.

Description

Technical Field

[0001] The utility model belongs to the field of nuclear industry ventilation systems, in particular to a small isolation air valve. Background Art

[0002] Isolation air valves are important terminal control accessories and important components of ventilation, air conditioning and air purification projects in nuclear power plants. Isolation air valves are the most critical valves in the ventilation isolation system of the nuclear island, and are also the last physical barrier to prevent the leakage of radioactive substances. Their key role is self-evident. When a serious nuclear safety leakage accident occurs, isolation air valves are required to quickly isolate the air flow on both sides of the valve to cut off and separate the flow of air, control the nuclear pollution source inside, and avoid nuclear leakage. Otherwise, once a leakage accident occurs, the harm is immeasurable.

[0003] At present, the isolation air valve is mainly opened and closed by electrical or manual devices to isolate the ventilation system. The sealing rubber strip on the existing isolation air valve is rectangular with a small semicircular boss, which is stuck in the valve seat groove, and the fastening screw is screwed into the rubber strip obliquely through the valve seat to fix it. During the operation of the valve, it is often opened and closed, accompanied by frequent friction contact and separation between the valve plate and the sealing ring, and there is a high wear of the small semicircular solid boss on the sealing ring, resulting in valve sealing failure and varying degrees of leakage. For small-caliber isolation valves, due to the small space and the need to use fastening screws to fix the sealing ring, it is extremely difficult to replace the sealing ring on site. Summary of the invention

[0004] The purpose of the embodiment of the utility model is to provide a small isolation air valve to reduce the difficulty of replacing the sealing ring and improve the installation efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is a small isolation air valve, including an electric device, a valve body, a valve shaft, and a valve plate;

[0006] The valve body comprises a rectangular frame body formed by connecting an upper frame, a left frame, a lower frame and a right frame in sequence, an electric device bracket is arranged on the top of the upper frame, and the electric device is fixed on the electric device bracket by a first bolt;

[0007] The electric device includes a transmission shaft connected to one end of the valve shaft through a coupling to control the rotation of the valve shaft;

[0008] The other end of the valve shaft extends horizontally through the left frame and is inserted into the right frame;

[0009] The valve plate is fixed on the valve shaft by countersunk screws arranged on the top. A detachable sealing strip is arranged on the side of the valve plate in contact with the valve shaft. The sealing strip is arranged on the edges of both sides of the valve plate, the bottom edge and the lower side of the valve shaft.

[0010] Furthermore, the valve body and the valve shaft are limited by a bearing seat, wherein a bearing cover is also provided on the bearing seat on the left frame, and the bearing cover is fixed to the bearing seat of the left frame by fastening bolts and fastening washers;

[0011] A bearing end cover is also provided on the bearing seat of the right frame, and the bearing end cover is fixed to the bearing seat of the right frame by fastening bolts and fastening washers, and the bearing end cover is also connected to the axis of the valve shaft by a first screw;

[0012] Bearings are arranged between the valve shaft, the bearing cover and the bearing end cover.

[0013] Furthermore, an O-ring is provided between the fastening washer and the bearing seat.

[0014] Furthermore, a metal hanging plate is provided at each connection between the upper frame and the left frame and the right frame. The upper part of the hanging plate is semicircular, a hanging hole is provided at the center of the circle, and the lower part is square; it is used to hang the entire isolation air valve.

[0015] Furthermore, the upper frame is provided with an inner cross brace, one end of which is fixed to the upper frame, and the other end of which is in contact with a sealing strip provided on the valve plate in a closed state of the valve; and a horizontal portion of the inner cross brace is tangent to the valve shaft.

[0016] Furthermore, the sealing strip and the valve plate are fixed by nuts, a first washer, and a low-neck bolt, and a pressure plate is arranged between the first washer and the sealing strip; and an Ω-shaped mortise and tenon joint is adopted between the sealing strips.

[0017] Furthermore, the lower frame is provided with a valve seat for limiting the valve plate, and the valve seat and the lower frame are fixed by a second screw and a sealing gasket.

[0018] The beneficial effects of the utility model are:

[0019] The isolation air valve provided by the utility model can be easily installed and operate efficiently in a small space, which greatly reduces the demand for installation space and improves space utilization. The air valve can be widely used in various complex and compact space environments without being affected by space restrictions. The utility model realizes the function of rapid replacement of the sealing ring, which can ensure that the operator can complete the replacement task quickly and conveniently even in a small space. It greatly reduces the downtime for maintenance and significantly improves work efficiency, while also reducing the risk of production losses or service interruptions caused by long-term downtime. Whether it is regular maintenance or sudden fault handling, users can quickly restore the normal operating state of the system. In addition, the utility model simplifies the maintenance workflow, reduces time costs while meeting the required sealing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a front view schematic diagram of a small isolation air valve in this embodiment;

[0022] Figure 2 is a cross-sectional view of a small isolation air valve according to this embodiment;

[0023] Figure 3 Schematic diagram of the sealing strip in this embodiment.

[0024] In the figure, 1, electric device; 2, coupling; 3, bearing cover; 4, valve shaft; 5, valve body; 6, valve plate; 7, O-ring; 8, bearing end cover; 9, first screw; 10, bearing; 11, fastening bolt; 12, fastening washer; 13, pressure plate; 14, nut; 15, first washer; 16, low neck bolt; 17, valve seat; 18, sealing gasket; 19, second screw; 20, sealing strip; 21, countersunk screw; 22, lifting plate; 23, first bolt; 501, electric support; 502, bearing seat; 503, upper frame; 504, right frame; 505, lower frame; 506, left frame; 507, inner cross brace. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Figure 1~Figure 3It is a structural schematic diagram of a small isolation air valve device according to an embodiment of the utility model. As shown in the figure, the embodiment of the present disclosure provides a small isolation air valve, which mainly includes an electric device 1, a valve body 5, a valve shaft 4, and a valve plate 6; the valve body 5 is a rectangular frame composed of an upper frame 503, a left frame 506, a lower frame 505, and a right frame 504 connected in sequence, and an electric support 501 is arranged on the top of the left frame 506; the electric device 1 is fixed to the electric support 501 by a first bolt 23, and the transmission shaft of the electric device 1 passes through the electric support 501 and is connected to one end of the valve shaft 4 through a coupling 2, and the other end of the valve shaft 4 passes through the left frame 506 and extends horizontally The right frame 504 is inserted and limited by the bearing seat 502 set on the left frame 506 and the right frame 504; wherein the bearing cover 3 is fixed to the bearing seat 502 on the left frame 506 by fastening bolts 11 and fastening washers 12, the valve shaft 4 passes through the bearing cover 3, the bearing end cover 8 is fixed to the bearing seat 502 in the right frame 504 by fastening bolts 11 and fastening washers 12, the bearing end cover 8 is also connected to the axis of the valve shaft 4 by the first screw 9, and a bearing 10 is arranged between the bearing end cover 8 and the bearing cover 3 and the valve shaft 4. An O-type sealing ring 7 is arranged between the fastening washer 12 and the bearing seat 502. A metal hanging plate 22 is respectively arranged at the connection between the upper frame 503 and the left frame 506 and the right frame 504. The upper part of the hanging plate 22 is semicircular, with a hanging hole arranged at the center of the circle, and the lower part is square, with two screw holes arranged. The upper frame 503 is also provided with an inner cross brace 507, one end of the inner cross brace 507 is connected to the upper frame 503, and the other end is in contact with the sealing strip 20 arranged on the valve plate 6 when the valve is in the closed state, and the horizontal part of the inner cross brace 507 is tangent to the valve shaft 4 to ensure that the sealing surface is flat.

[0027] like Figure 2 The valve plate 6 is fixed to the valve shaft 4 by a countersunk screw 21 arranged at the top, a sealing strip 20 is arranged at the edge of the valve plate 6 and the lower part of the valve shaft 4, the sealing strip 20 and the valve plate 6 are fixed by a nut 14, a first washer 15, and a low-neck bolt 16, and a pressure plate 13 is arranged between the first washer 15 and the sealing strip 20. The lower frame 505 is provided with a valve seat 17 for limiting the valve plate 6, the valve seat 17 is fixed to the lower frame 505 by a second screw 19, and a sealing gasket 18 is arranged between the valve seat 17 and the lower frame 505; Figure 3 The sealing strip 20 adopts Ω-shaped tenon joint to ensure sealing.

[0028] The specific working mode of the small isolation air valve provided in this embodiment is as follows: the electric device 1 drives the coupling 2 to rotate, and the valve shaft 4 rotates along with the coupling 2 to drive the valve plate 6 to open or close. When closed, the sealing strip 20 on the valve plate 6 is in direct contact with the valve seat 17, and the sealing is achieved by the sealing strip 20. When the sealing strip 20 fails, the sealing strip 20 is replaced by disassembling the nut 14, the first washer 15, and the low neck bolt 16.

[0029] The power source of the electric device can be a motor. Of course, the embodiments of the present disclosure include but are not limited to this, and other devices that can drive the coupling and the valve shaft to rotate can also be used.

[0030] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A small-sized isolation air valve, comprising a valve body (5), a valve shaft (4), and a valve plate (6); characterized in that: Also includes an electric device (1); The valve body (5) comprises an upper frame (503), a left frame (506), a lower frame (505), and a right frame (504) connected in sequence to form a rectangular frame, an electric support (501) is arranged on the top of the upper frame (503), and the electric device (1) is fixed to the electric support (501) by a first bolt (23); The electric device (1) comprises a transmission shaft connected to one end of the valve shaft (4) via a coupling (2) to control the rotation of the valve shaft (4); The other end of the valve shaft (4) passes through the left frame (506), extends horizontally, and is inserted into the body of the right frame (504); The valve plate (6) is fixed to the valve shaft (4) by means of a countersunk screw (21) arranged at the top, and a removable sealing strip (20) is arranged on the side of the valve plate (6) in contact with the valve shaft (4), and the sealing strip (20) is arranged on the edges of both sides of the valve plate (6), the edge of the bottom side and the lower side of the valve shaft (4).

2. A small isolation air valve according to claim 1, characterized in that: The valve body (5) and the valve shaft (4) are limited by a bearing seat (502), wherein a bearing cover (3) is also provided on the bearing seat (502) on the left frame (506), and the bearing cover (3) is fixed to the bearing seat (502) of the left frame (506) by means of a fastening bolt (11) and a fastening washer (12); A bearing end cover (8) is also provided on the bearing seat (502) of the right frame (504). The bearing end cover (8) is fixed to the bearing seat (502) of the right frame (504) via a fastening bolt (11) and a fastening washer (12). The bearing end cover (8) is also connected to the axis of the valve shaft (4) via a first screw (9). Bearings (10) are arranged between the valve shaft (4), the bearing cover (3) and the bearing end cover (8).

3. A small isolation air valve according to claim 2, characterized in that: An O-type sealing ring (7) is provided between the fastening washer (12) and the bearing seat (502).

4. A small isolation air valve according to claim 1, characterized in that: A metal hanging plate (22) is provided at each connection between the upper frame (503) and the left frame (506) and the right frame (504); the upper portion of the hanging plate (22) is semicircular, a hanging hole is provided at the center of the circle, and the lower portion is square; and the hanging plate is used for hanging the entire isolation air valve.

5. A small isolation air valve according to claim 1, characterized in that: The upper frame (503) is provided with an inner cross brace (507), one end of the inner cross brace (507) is fixed to the upper frame (503), and the other end is in contact with a sealing strip (20) provided on the valve plate (6) when the valve is in a closed state; and a horizontal portion of the inner cross brace (507) is tangent to the valve shaft (4).

6. A small isolation air valve according to claim 1, characterized in that: The sealing strip (20) and the valve plate (6) are fixed by means of a nut (14), a first washer (15), and a low-neck bolt (16); a pressure plate (13) is provided between the first washer (15) and the sealing strip (20); and the sealing strips (20) are connected by means of an Ω-shaped tenon joint.

7. A small isolation air valve according to claim 1, characterized in that: The lower frame (505) is provided with a valve seat (17) for limiting the position of the valve plate (6), and the valve seat (17) and the lower frame (505) are fixed by a second screw (19) and a sealing gasket (18).

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