Blowback device

Abstract

The utility model discloses a blowback device, which comprises a base, an upper cover connected with the base to form an air cavity and a piston, and is characterized in that a piston cavity and an air inlet hole are sequentially arranged in the middle of the upper cover from inside to outside, and the piston is positioned in the piston cavity and limited between the air inlet hole and an exhaust part of the base. The whole device is only composed of the base, the upper cover, the rubber piston, the sealing O-shaped ring and the matched connecting piece, the structure is simple, and assembling is convenient and fast; the base and the upper cover are made of reinforced nylon materials and are formed through mold opening casting, large or complex machine parts are easy to manufacture, forming is convenient, and equipment investment is small.

Description

Technical Field

[0001] The utility model relates to the field of dust removal equipment, in particular to a back-blowing device. Background Art

[0002] Nowadays, dust is generated during the powder material transportation process. The clean air is discharged into the atmosphere through the filtering effect of the filter. However, after a long time, a layer of material will stick to the filter. Compressed air is needed for backblowing to blow the material off to ensure the air permeability of the filter. Backblowing requires a certain amount of compressed air to be released suddenly, so an air bag is prepared to store air to meet the backblowing needs.

[0003] Authorization announcement number CN 205590030 U discloses a new type of back-blowing air bag, which realizes the up and down movement of the piston and the storage and release of gas by controlling the air intake of the air inlet. The above technical solution has many parts and a complex structure, which is not conducive to installation and maintenance. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a back-blowing device, the overall device has a simple structure and is easy to install and maintain.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a backblowing device, including a base, an upper cover connected to the base to form an air cavity, and a piston. The key lies in: a piston cavity and an air inlet hole are provided in sequence from the inside to the outside in the middle of the upper cover, and the piston is located in the piston cavity and is limited between the air inlet hole and the exhaust part of the base.

[0006] Furthermore, a nut is provided in the air inlet hole.

[0007] Furthermore, a sealing boss is provided at the inner end of the piston cavity, which is coaxially arranged with the air inlet hole and cooperates with the piston to form a sealing structure.

[0008] Furthermore, a groove matching with the sealing boss is provided on the top of the piston.

[0009] Furthermore, the exhaust portion is located in the middle of the base, and an exhaust channel is provided on the exhaust portion.

[0010] Furthermore, the top and / or bottom of the exhaust passage is trumpet-shaped.

[0011] Furthermore, the top of the exhaust portion extends into the piston cavity.

[0012] Furthermore, the bottom of the exhaust portion passes through the base and is located outside the base.

[0013] Furthermore, a sealing ring is provided between the mounting surfaces of the upper cover and the base.

[0014] Furthermore, an upper cavity for forming an air cavity and a ring-shaped lower cavity are respectively provided in the upper cover and the base.

[0015] The utility model adopts the form of assembling a two-body structure of a base and an upper cover. The whole device is only composed of a base, an upper cover, a rubber piston, a sealing O-ring and matching connecting parts, with a simple structure, convenient assembly and easy maintenance; the base and the upper cover are made of reinforced nylon material and are formed by open mold casting, which is easy to manufacture large or complex machine parts, convenient molding and low equipment investment; the base and the upper cover are made by open mold casting, with good uniformity of external dimensions, high replaceability of accessories during later maintenance, and no problems of welding deformation, slag inclusion leakage and weld cracking as a whole; the device is light in weight, which reduces the strength requirement for the mounting plate of the vacuum suction machine.

[0016] The utility model is described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the back-blowing device of the utility model.

[0018] In the accompanying drawings, 1, base, 1-1, exhaust part, 1-2, exhaust channel, 2, upper cover, 2-1, piston chamber, 2-2, air inlet hole, 2-3, sealing boss, 3, piston, 3-1, groove, 4, nut, 5, sealing ring. DETAILED DESCRIPTION

[0019] Referring to the attached drawings, the utility model provides a back-blowing device, comprising a base 1, an upper cover 2 connected to the base 1 by studs and nuts to form an air cavity, and a piston 3. The base 1 and the upper cover 2 are made of reinforced nylon and are cast by open molds. The piston 3 is a rubber piston.

[0020] A piston chamber 2-1 and an air inlet 2-2 are provided in the middle of the upper cover 2 from the inside to the outside, and the diameter of the piston chamber 2-1 is larger than the diameter of the air inlet 2-2. The piston 3 is located in the piston chamber 2-1 and is limited between the air inlet 2-2 and the top surface of the exhaust portion 1-1 of the base 1. In addition, an upper cavity for forming an air cavity is provided in the upper cover 2 and on the inner side of the piston chamber 2-1. A nut 4 is provided in the air inlet 2-2 for connecting the air inlet pipe to control the inlet and outlet of the gas through a matching solenoid valve. A sealing boss 2-3 is provided at the inner end of the piston chamber 2-1, which is coaxially arranged with the air inlet 2-2 and cooperates with the piston 3 to form a sealing structure during exhaust. A groove 3-1 is provided on the top of the piston 3 to cooperate with the sealing boss 2-3.

[0021] The base 1 is provided with an exhaust portion 1-1 and a lower cavity for forming an air cavity and in an annular shape, wherein the exhaust portion 1-1 is located in the middle of the base 1, and the lower cavity is in an annular shape surrounding the exhaust portion 1-1. After the upper cover 2 is connected to the base 1, the upper cavity and the lower cavity form an air cavity. The top of the exhaust portion 1-1 extends into the piston cavity 2-1, and the bottom passes through the base 1 and is located outside the base 1. An exhaust channel 1-2 is provided on the exhaust portion 1-1. The top and / or bottom of the exhaust channel 1-2 are trumpet-shaped, and in this embodiment, both the top and the bottom are trumpet-shaped.

[0022] In order to achieve airtightness of the air cavity, a sealing ring 5 is provided between the mounting surfaces of the upper cover 2 and the base 1. An annular groove for limiting the sealing ring 5 is provided on the base 1.

[0023] The piston 3 is made of rubber. During the inflation process, the rubber piston skirt cannot move out of the piston cavity 2-1. The diameter of the piston cavity 2-1 is 1 mm smaller than the rubber piston skirt.

[0024] The specific working process of the back-blowing device of the utility model is as follows: during inflation, compressed air enters the air cavity from the air inlet 2-2 under the control of the solenoid valve. Under the action of air pressure, the rubber piston moves downward along the piston cavity 2-1 until it is pressed against the exhaust portion 1-1, thereby closing the exhaust port so that the gas cannot be discharged from the exhaust channel 1-2. In this process, the gas passes through the gap between the piston and the piston cavity 2-1 to deform the skirt of the rubber piston and enter the cavity, thereby filling the inner cavity with compressed air. When the pressure in the cavity is balanced with the input pressure, the rubber piston skirt fits the inner wall of the piston cavity 2-1 in a full circle.

[0025] When exhausting, the solenoid valve is actuated to allow the air inlet 2-2 to be directly connected to the atmosphere to release pressure. Under the action of the inner cavity pressure, the rubber piston moves upward until the rubber piston blocks the air inlet. In this process, the rubber piston leaves the exhaust part 1-1 to open the exhaust, and the compressed air is discharged from the exhaust channel 1-2, completing a cycle.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A backflush device, comprising a base (1), an upper cover (2) connected to the base (1) to form an air cavity, and a piston (3), characterized in that: A piston chamber (2-1) and an air inlet hole (2-2) are provided in sequence from the inside to the outside in the middle of the upper cover (2); the piston (3) is located in the piston chamber (2-1) and is limited between the air inlet hole (2-2) and the exhaust portion (1-1) of the base (1).

2. The backflush device according to claim 1, characterized in that: A nut (4) is provided in the air inlet hole (2-2).

3. The backflush device according to claim 1, characterized in that: A sealing boss (2-3) is provided at the inner end of the piston cavity (2-1), which is coaxially arranged with the air inlet hole (2-2) and cooperates with the piston (3) to form a sealing structure.

4. The backflush device according to claim 3, characterized in that: A groove (3-1) matching with the sealing boss (2-3) is provided on the top of the piston (3).

5. The backflush device according to claim 1, characterized in that: The exhaust portion (1-1) is located in the middle of the base (1), and an exhaust channel (1-2) is provided on the exhaust portion (1-1).

6. The backflush device according to claim 5, characterized in that: The top and / or bottom of the exhaust channel (1-2) is trumpet-shaped.

7. The backflush device according to claim 5, characterized in that: The top of the exhaust portion (1-1) extends into the piston chamber (2-1).

8. The backflush device according to claim 5, characterized in that: The bottom of the exhaust portion (1-1) passes through the base (1) and is located outside the base (1).

9. The backflush device according to any one of claims 1 to 8, characterized in that: A sealing ring (5) is provided between the mounting surfaces of the upper cover (2) and the base (1).

10. The backflush device according to any one of claims 1 to 8, characterized in that: An upper cavity for forming an air cavity and a ring-shaped lower cavity are respectively provided in the upper cover (2) and the base (1).

Images