Double-layer sealed bag-type dust collector protective valve

Abstract

The utility model relates to a double-layer sealed bag-type dust collector protection valve, which comprises a valve seat and a valve plate assembly, and is characterized in that the valve seat consists of an outer valve pipe and an inner valve pipe, a flue bottom plate is provided with a smoke outlet corresponding to the inner valve pipe, the upper end of the inner valve pipe is lower than the upper end of the outer valve pipe, and the upper ends of the outer valve pipe and the inner valve pipe are respectively provided with a flexible sealing ring. The valve plate assembly comprises a fixed valve plate, a movable valve plate, a plurality of longitudinal studs arranged on the lower surface of the fixed valve plate, springs arranged on the longitudinal studs in a sleeving mode and combined nuts, the movable valve plate is clamped between the springs and the combined nuts, and the outer diameter of the fixed valve plate is larger than that of the outer valve pipe. The outer diameter of the movable valve plate is smaller than that of the outer valve pipe and larger than that of the inner valve pipe, a secondary sealing space is formed between the outer valve pipe and the inner valve pipe, and a sealing air connecting pipe communicated with the secondary sealing space is fixed to the outer side wall of the outer valve pipe. Compared with the prior art, the sealing performance is further enhanced, stable operation is guaranteed, operation and maintenance are easy and convenient, and the manufacturing cost is low.

Description

Technical Field

[0001] This utility model relates to the technical field of baghouse dust collectors, specifically a double-layer sealed protective valve for baghouse dust collectors, which can be applied inside the air duct of a baghouse dust collector to protect the filter bags from damage caused by high temperature, water vapor, and oil. Background Technology

[0002] Baghouse dust collectors are the most widely used dust removal equipment, characterized by high dust removal efficiency, no secondary pollution, and easy recovery of dry materials. Under some unconventional operating conditions, such as excessively high temperatures exceeding the baghouse's design operating temperature, or when boilers start up and the flue gas contains oil or has excessive humidity, the flue gas cannot directly pass through the filter bags; otherwise, it will damage the bags or shorten their service life. In such cases, it is essential for the flue gas to bypass through a protective valve. During normal operation of the dust collector, the protective valve is in the closed state, and its sealing performance directly affects the emission efficiency.

[0003] In the prior art, the valve seat of the protective valve is fixed to the bottom plate of the flue, and a sealing ring is provided on the upper edge of the valve seat. The sealing ring is tightly connected with the valve plate to achieve sealing. However, the aging of the sealing ring and other reasons can cause problems with poor sealing. Utility Model Content

[0004] The purpose of this utility model is to provide a double-layer sealed bag filter dust collector protection valve with a reasonable structural design and safe and reliable use, which solves the above-mentioned problems. Compared with the prior art, it further enhances the sealing performance, ensures stable operation, and is easy to operate and maintain with low manufacturing cost.

[0005] The technical solution of this utility model is:

[0006] A double-layer sealed bag filter dust collector protection valve includes a valve seat fixed to a flue bottom plate and a valve plate assembly fastened to the valve seat. The key technical features are: the valve seat consists of an outer valve tube and an inner valve tube; the flue bottom plate has a corresponding flue outlet for the inner valve tube; the upper end of the inner valve tube is lower than the upper end of the outer valve tube; flexible sealing rings are respectively provided at the upper ends of the outer and inner valve tubes; the valve plate assembly includes a fixed valve plate, a movable valve plate, multiple longitudinal studs on the lower surface of the fixed valve plate, a spring fitted onto the longitudinal studs, and a combined nut screwed onto the lower part of the longitudinal studs; the movable valve plate is clamped between the spring and the combined nut; the movable valve plate has clearance through holes corresponding to the longitudinal studs; the outer diameter of the fixed valve plate is larger than the outer diameter of the outer valve tube; the outer diameter of the movable valve plate is smaller than the outer diameter of the outer valve tube but larger than the outer diameter of the inner valve tube; a secondary sealing space is formed between the outer and inner valve tubes; a sealing air pipe connected to the secondary sealing space is fixed to the outer wall of the outer valve tube.

[0007] The aforementioned double-layer sealed bag filter dust collector protection valve comprises a locking nut that contacts the movable valve plate and a fixing nut that abuts the other end of the locking nut.

[0008] The aforementioned double-layer sealed bag filter dust collector protection valve has a short pipe fixed at the center of the upper surface of the fixed valve plate. The upper end of the short pipe is inserted into a connecting rod and fixed by a pin, which facilitates maintenance.

[0009] In the aforementioned double-layer sealed bag filter dust collector protective valve, the distance between the movable valve plate and the fixed valve plate is greater than the distance between the upper ends of the outer valve pipe and the inner valve pipe.

[0010] The beneficial effects of this utility model are:

[0011] In use, the fixed valve plate and the movable valve plate are tightly connected to the flexible sealing rings at the upper ends of the outer and inner valve pipes, respectively. The tightness of the movable pressure plate can be adjusted by the spring, achieving the first layer of sealing. Simultaneously, a secondary sealing space is formed between the outer and inner valve pipes. A sealing air pipe connected to this secondary sealing space is fixed to the outer wall of the outer valve pipe. During operation, sealing air is introduced into the secondary sealing space through this pipe. The sealing air, combined with the spring's pressure, ensures the tightness of the movable pressure plate, achieving the second layer of sealing and further improving sealing performance. This achieves "zero leakage" of the protective valve, ensuring the safe and stable operation of the dust collector. The entire device is relatively simple to assemble and maintain, and has low manufacturing costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Outer valve pipe, 2. Flexible sealing ring, 3. Movable valve plate, 4. Fixed valve plate, 5. Spring, 6. Longitudinal stud, 7. Short pipe, 8. Sealed air pipe, 9. Pin, 10. Connecting rod, 11. Inner valve pipe, 12. Flue bottom plate. Detailed Implementation

[0014] The present invention will be described in detail with reference to the accompanying drawings.

[0015] like Figure 1 As shown, the double-layer sealed bag filter dust collector protection valve includes a valve seat fixed on the flue bottom plate 12 and a valve plate assembly fastened to the valve seat.

[0016] The valve seat consists of an outer valve tube 1 and an inner valve tube 11. The flue bottom plate 12 is provided with a smoke outlet corresponding to the inner valve tube 11. The upper end of the inner valve tube 11 is lower than the upper end of the outer valve tube 1, and the upper ends of the outer valve tube 1 and the inner valve tube 11 are respectively provided with flexible sealing rings 2.

[0017] The valve plate assembly includes a fixed valve plate 4, a movable valve plate 3, multiple longitudinal studs 6 disposed on the lower surface of the fixed valve plate 4, a spring 5 fitted onto the longitudinal studs 6, and a combination nut screwed onto the lower part of the longitudinal studs 6. The movable valve plate 3 is clamped between the spring 5 and the combination nut, and the movable valve plate 3 has clearance through holes corresponding to the longitudinal studs 6. The outer diameter of the fixed valve plate 4 is larger than the outer diameter of the outer valve tube 1, and the outer diameter of the movable valve plate 3 is smaller than the outer diameter of the outer valve tube 1 but larger than the outer diameter of the inner valve tube 11. A secondary sealing space is formed between the outer valve tube 1 and the inner valve tube 11, and a sealing air pipe 8 communicating with the secondary sealing space is fixed to the outer side wall of the outer valve tube 1.

[0018] In this embodiment, the combined nut consists of a locking nut that contacts the movable valve plate 3 and a fixing nut that abuts the other end of the locking nut. The distance between the movable valve plate 3 and the fixed valve plate 4 is greater than the distance between the upper ends of the outer valve tube 1 and the inner valve tube 11. A short tube 7 is fixed at the center of the upper surface of the fixed valve plate 4. The upper end of the short tube 7 is inserted into the connecting rod 10 and connected and fixed by a pin 9 for easy maintenance.

[0019] Working principle:

[0020] Therefore, the number and size of the protective valves should be set according to the air volume of the dust collector.

[0021] Powered by the power source, the connecting rod 10 pushes the fixed valve plate 4 downward and presses it against the outer valve pipe 1. The fixed valve plate 4 and the movable valve plate 3 are tightly connected to the flexible sealing rings 2 at the upper ends of the outer valve pipe 1 and the inner valve pipe 11, respectively, achieving the closed state of the protective valve. At this time, the spring 5 is in a compressed state, ensuring the sealing of the valve's interior. Simultaneously, sealing air is introduced into the secondary sealing space through the sealing air pipe 8. The sealing air, in conjunction with the pressing force of the spring 5, ensures the tightness of the movable pressure plate 3.

[0022] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A double seal cloth bag precipitator protection valve comprising a valve seat fixed on the bottom plate of the flue, a valve plate assembly buckled on the valve seat, characterized in that: The valve seat is composed of an outer valve pipe and an inner valve pipe, the flue bottom plate is provided with a smoke outlet corresponding to the inner valve pipe, the upper end of the inner valve pipe is lower than the upper end of the outer valve pipe, the upper ends of the outer valve pipe and the inner valve pipe are respectively provided with flexible sealing rings, the valve plate assembly comprises a fixed valve plate, a movable valve plate, a plurality of longitudinal studs arranged on the lower surface of the fixed valve plate, springs sleeved on the longitudinal studs, combined nuts screwed on the lower parts of the longitudinal studs, the movable valve plate is clamped between the springs and the combined nuts, the movable valve plate is provided with avoiding through holes corresponding to the longitudinal studs, the outer diameter of the fixed valve plate is greater than the outer diameter of the outer valve pipe, the outer diameter of the movable valve plate is smaller than the outer diameter of the outer valve pipe and greater than the outer diameter of the inner valve pipe, a secondary sealing space is formed between the outer valve pipe and the inner valve pipe, and the outer side wall of the outer valve pipe is fixed with a sealing air connection pipe in communication with the secondary sealing space.

2. The dual seal baghouse purge valve of claim 1, wherein: The combined nut is composed of a locking nut in contact with the movable valve plate and a fixed nut attached to the other end surface of the locking nut.

3. The dual seal cloth baghouse purge valve of claim 1, wherein: The upper surface of the fixed valve plate is fixed with a short pipe, the upper end of the short pipe is inserted into a connecting rod and is connected and fixed by using a pin shaft, and maintenance is facilitated.

4. The dual seal cloth baghouse purge valve of claim 1, wherein: The distance between the movable valve plate and the fixed valve plate is greater than the distance between the upper ends of the outer valve pipe and the inner valve pipe.

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