Pipeline negative pressure protection device

Abstract

The utility model discloses a pipeline negative pressure protection device which comprises an air pipe, an opening and closing protection mechanism is arranged in the air pipe, a limiting plate is fixedly connected to the air pipe, a protection mechanism is arranged on the opening and closing protection mechanism, a protection cage is fixedly connected to the end of the air pipe, and the opening and closing protection mechanism comprises a sealing plate. A supporting seat is fixedly connected to the top of the sealing plate, a valve plate is rotatably connected to the interior of the supporting seat, a connecting ring is fixedly connected to the valve plate, a steel wire rope is fixedly connected to the connecting ring, a pulley is arranged on one side of the steel wire rope, and a balancing weight mounting frame is fixedly connected to the bottom end of the steel wire rope. According to the pipeline negative pressure protection device, when the draught fan stops, the valve plate slowly rotates downwards under the action of the balancing weight, the valve plate and the sealing plate are gradually closed, the air pipe is closed, the air pipe is prevented from being suddenly closed, the negative pressure in the air pipe is prevented from being instantly increased, and the draught fan and equipment are well protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline protection technical field, concretely is a pipeline negative pressure protection device. BACKGROUND

[0002] The fan inlet pipeline and equipment are influenced by the negative pressure generated by the fan, the valve before the fan is suddenly closed or blocked, the fan fails to reduce the frequency or stop in time (the stop of large fan is a slow process), the negative pressure of the pipeline before the fan increases instantaneously, destroys the pipeline before the fan and the equipment, and the protection effect of the pipeline and the equipment is not ideal. CONTENT OF UTILITY MODEL

[0003] In view of the deficiency of prior art, the utility model provides a pipeline negative pressure protection device, solves the above -mentioned problem.

[0004] In order to realize above -mentioned purpose, the utility model discloses the following technical schemes to be realized: a pipeline negative pressure protection device, including the air pipe, the air pipe inside is equipped with the opening and closing protection mechanism, the air pipe is fixedly connected with the limiting board, the opening and closing protection mechanism is equipped with the protection mechanism, the air pipe end is fixedly connected with the protective cage,

[0005] The opening and closing protection mechanism includes the sealing plate, the sealing plate top is fixedly connected with the support seat, the support seat inside is rotatably connected with the valve plate, the valve plate is fixedly connected with the connecting ring, the connecting ring is fixedly connected with the steel wire rope, one side of the steel wire rope is equipped with the pulley, the steel wire rope bottom is fixedly connected with the counterweight mounting bracket, a plurality of counterweights are installed on the counterweight mounting bracket, the sealing plate is fixedly connected with the switch mounting plate, the switch mounting plate is fixedly connected with the proximity switch, the sealing plate is fixedly connected with the sealing gasket, and the sealing rope is arranged between the sealing plate and the air pipe.

[0006] Preferably, the sealing plate is fixedly installed in the air pipe by bolts, and the sealing plate is inclinedly arranged in the air pipe, so that the sealing plate can be conveniently replaced, and the valve plate and the sealing plate can be completely closed.

[0007] Preferably, the valve plate top end is rotatably connected with the support seat, and the valve plate bottom end is arranged as a free end, so that the valve plate can rotate around the support seat, thereby enabling the air pipe to be opened and closed.

[0008] Preferably, the top end of the steel wire rope is fixedly connected with the connecting ring, and the bottom end of the steel wire rope penetrates through the air pipe and extends to the outside of the air pipe, so that the connecting ring can be moved by the steel wire rope.

[0009] Preferably, the sealing gasket is made of foamed rubber material, and the pulley is rotatably connected with the inner wall of the sealing plate, so that the steel wire rope can be guided and supported by the pulley.

[0010] Preferably, the air pipe is fixedly connected with a mounting flange at one end away from the protective cage, and the maximum opening angle between the valve plate and the sealing plate is 50 degrees, so that the opening angle of the valve plate can be avoided to be too large.

[0011] Preferably, the protective mechanism comprises a protective cylinder, the bottom end of the steel wire rope penetrates through the protective cylinder and extends into the protective cylinder, the bottom end of the protective cylinder is fixedly connected with a fixed bottom plate, a fixed plate is installed on the protective cylinder, and the fixed plate is detachably connected with the protective cylinder through a plurality of mounting bolts, so that the counterweight can be conveniently installed.

[0012] The utility model provides a pipeline negative pressure protection device, has the following beneficial effects compared with prior art:

[0013] 1、 the pipeline negative pressure protection device, through in fan shutdown, the valve plate is slowly down under the action of counterweight, the valve plate gradually closes with sealing plate, close air pipe, prevent suddenly close air pipe, avoid the inside negative pressure of air pipe instantaneous increase, to the good protection effect to fan and equipment.

[0014] 2、 the pipeline negative pressure protection device, by unscrewing mounting bolt, take down fixed plate from protective cylinder, make protective cylinder inside and outside intercommunication, and staff can install counterweight on counterweight mounting frame from outside, effectively improve the convenience of installation. SHEET DESCRIPTION

[0015] Figure 1 It is the whole structure schematic view of the utility model;

[0016] Figure 2 It is the section structure schematic view of the utility model;

[0017] Figure 3 It is the whole structure schematic view of the utility model; Figure 2 It is the structure enlarged view of A place;

[0018] Figure 4 It is the protective mechanism structure schematic view of the utility model.

[0019] In the drawing: 1, air pipe;2, opening and closing protection mechanism;201, sealing plate;202, support seat;203, valve plate;204, connecting ring;205, steel wire rope;206, pulley;207, switch mounting plate;208, proximity switch;209, sealing gasket;210, sealing rope;211, counterweight;212, counterweight mounting frame;3, protective cage;4, limiting plate;5, protective mechanism;501, protective cylinder;502, fixed bottom plate;503, fixed plate;504, mounting bolt. DETAILED DESCRIPTION

[0020] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] Please refer to Figures 1-3 The utility model provides a technical scheme: a pipeline negative pressure protection device, including air pipe 1, be equipped with opening and closing protection mechanism 2 in air pipe 1, air pipe 1 is fixedly connected with the limiting plate 4, can play the limiting effect to valve plate 203, be equipped with protection mechanism 5 on opening and closing protection mechanism 2, air pipe 1 end fixedly connected with the protective cage 3, can prevent foreign matter to enter air pipe 1 inside, air pipe 1 is fixedly connected with the installation flange away from the protective cage 3 one end, can be convenient and fan are connected installation, can prevent suddenly closing air pipe 1 through opening and closing protection mechanism 2, avoid the inside negative pressure instantaneous increase of air pipe 1, to fan and equipment play good protection effect.

[0022] The opening and closing protection mechanism 2 comprises a sealing plate 201, the top of the sealing plate 201 is fixedly connected with a support seat 202, the support seat 202 is rotationally connected with a valve plate 203 inside, the maximum opening angle between the valve plate 203 and the sealing plate 201 is 50 degrees, which can avoid that the opening angle of the valve plate 203 is too large, the sealing plate 201 is fixedly installed in the air pipe 1 through bolts, and the sealing plate 201 is obliquely arranged in the air pipe 1, so that the sealing plate 201 can be conveniently replaced, and the valve plate 203 and the sealing plate 201 can be completely closed, the top end of the valve plate 203 is rotationally connected with the support seat 202, the bottom end of the valve plate 203 is arranged as a free end, so that the valve plate 203 can rotate around the support seat 202, thereby the air pipe 1 can be opened and closed, a connecting ring 204 is fixedly connected to the valve plate 203, a steel wire rope 205 is fixedly connected to the connecting ring 204, the top end of the steel wire rope 205 is fixedly connected with the connecting ring 204, and the bottom end of the steel wire rope 205 penetrates through the air pipe 1 and extends to the outside of the air pipe 1, so that the connecting ring 204 can be moved by the steel wire rope 205, a pulley 206 is arranged on one side of the steel wire rope 205, the pulley 206 is rotationally connected with the inner wall of the sealing plate 201, so that the pulley 206 can guide and support the steel wire rope 205, a counterweight block mounting frame 212 is fixedly connected to the bottom end of the steel wire rope 205, a plurality of counterweight blocks 211 are mounted on the counterweight block mounting frame 212, which can play a counterweight role on the valve plate 203, so that the valve plate 203 can be automatically closed, and the valve plate 203 can be rotated to open the air pipe 1 when the valve plate 203 is subjected to negative pressure, a switch mounting plate 207 is fixedly connected to the sealing plate 201, a proximity switch 208 is fixedly connected to the switch mounting plate 207, the proximity switch 208 can detect the opening and closing state of the valve plate 203, a sealing gasket 209 is fixedly connected to the sealing plate 201, the sealing gasket 209 is made of foamed rubber material, which can buffer and seal the valve plate 203, and a sealing rope 210 is arranged between the sealing plate 201 and the air pipe 1, so that the sealing plate 201 and the air pipe 1 can be sealed by the sealing rope 210.

[0023] Please refer to Figure 1 and Figure 4 , the protection mechanism 5 comprises a protection cylinder 501, the bottom end of the steel wire rope 205 penetrates through the protection cylinder 501 and extends into the protection cylinder 501, the bottom end of the protection cylinder 501 is fixedly connected with a fixed bottom plate 502, a fixed plate 503 is mounted on the protection cylinder 501, the fixed plate 503 is detachably connected with the protection cylinder 501 through a plurality of mounting bolts 504, the fixed plate 503 can be removed from the protection cylinder 501 by unscrewing the mounting bolts 504, so that the inside of the protection cylinder 501 is communicated with the outside, and the workers can install the counterweight blocks 211 on the counterweight block mounting frame 212 from the outside, thereby effectively improving the convenience of installation.

[0024] When working, the fan works to produce negative pressure, and drives the valve plate 203 to rotate and open the air pipe 1. When the fan stops, the valve plate 203 slowly rotates downward under the action of the counterweight 211, and the valve plate 203 gradually closes with the sealing plate 201 to close the air pipe 1, so as to prevent the air pipe 1 from being suddenly closed, avoid the internal negative pressure of the air pipe 1 from being instantaneously increased, and play a good protection role on the fan and the equipment.

[0025] Meanwhile, the contents not described in detail in the specification all belong to the prior art known by those skilled in the art.

Claims

1. A pipeline negative pressure protection device, comprising an air duct (1), characterized in that: An opening and closing protection mechanism (2) is provided inside the air duct (1), a limit plate (4) is fixedly connected to the air duct (1), a protection mechanism (5) is provided on the opening and closing protection mechanism (2), and a protection cage (3) is fixedly connected to the end of the air duct (1); The opening and closing protection mechanism (2) comprises a sealing plate (201), the top of the sealing plate (201) is fixedly connected to a support seat (202), the interior of the support seat (202) is rotatably connected to a valve plate (203), the valve plate (203) is fixedly connected to a connecting ring (204), the connecting ring (204) is fixedly connected to a steel wire rope (205), a pulley (206) is provided on one side of the steel wire rope (205), and the bottom of the steel wire rope (205) is fixedly connected to the connecting ring (204). A counterweight mounting frame (212) is fixedly connected to the end thereof, a plurality of counterweights (211) are mounted on the counterweight mounting frame (212), a switch mounting plate (207) is fixedly connected to the sealing plate (201), a proximity switch (208) is fixedly connected to the switch mounting plate (207), a sealing gasket (209) is fixedly connected to the sealing plate (201), and a sealing rope (210) is provided between the sealing plate (201) and the air duct (1).

2. A pipeline negative pressure protection device according to claim 1, characterized in that: The sealing plate (201) is fixedly installed inside the air duct (1) by means of bolts, and the sealing plate (201) is arranged obliquely inside the air duct (1).

3. A pipeline negative pressure protection device according to claim 1, characterized in that: The top end of the valve plate (203) is rotatably connected to the support seat (202), and the bottom end of the valve plate (203) is configured as a free end.

4. A pipeline negative pressure protection device according to claim 1, characterized in that: The top end of the steel wire rope (205) is fixedly connected to the connecting ring (204), and the bottom end of the steel wire rope (205) passes through the air duct (1) and extends to the outside of the air duct (1).

5. The pipeline negative pressure protection device according to claim 1, characterized in that: The sealing pad (209) is made of foam rubber material, and the pulley (206) is rotatably connected to the inner wall of the sealing plate (201).

6. A pipeline negative pressure protection device according to claim 1, characterized in that: One end of the air duct (1) away from the protective cage (3) is fixedly connected to a mounting flange, and the maximum opening angle between the valve plate (203) and the sealing plate (201) is set to 50 degrees.

7. The pipeline negative pressure protection device according to claim 1, characterized in that: The protection mechanism (5) comprises a protection tube (501), and the bottom end of the steel wire rope (205) passes through the protection tube (501) and extends into the interior of the protection tube (501).

8. A pipeline negative pressure protection device according to claim 7, characterized in that: The bottom end of the protective tube (501) is fixedly connected to a fixed bottom plate (502), a fixed plate (503) is installed on the protective tube (501), and the fixed plate (503) is detachably connected to the protective tube (501) via a plurality of mounting bolts (504).

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