A negative pressure dust-proof sleeve device

Abstract

The present invention discloses a negative-pressure dust-proof sleeve device, which includes an inner sleeve and an outer sleeve. The inner sleeve is sleeved inside the outer sleeve. The device further includes a dust-proof ring fixedly installed at the top end of the outer sleeve. The dust-proof ring includes an installation sleeve ring and a horn-shaped sealing ring. The installation sleeve ring is fixed to the top of the outer sleeve. The bottom of the horn-shaped sealing ring is integrally formed with the inner wall of the installation sleeve ring. The top of the horn-shaped sealing ring is sealingly connected to the radial outer wall of the inner sleeve. A transition air chamber is formed between the inner wall of the horn-shaped sealing ring and the top end face of the outer sleeve. The present invention can adjust the size according to the actual situation to transform the existing sleeve structure, with strong compatibility. The design of the transition air chamber can reduce the air pressure difference inside and outside the sleeve structure, and change the target of gas exchange caused by clearance fit from ambient gas to clean gas brought by the air pipe, thereby prolonging the service life of the machine.

Description

Technical Field

[0001] The invention relates to the field of mechanical technology, and in particular to a negative pressure dustproof sleeve device. Background Art

[0002] Dust environment is a common operating environment for industrial machines, especially for the processing and transportation of powders and small particles. Machines working in dusty environments usually have a shorter design life and higher wear of moving parts than machines working in dust-free environments.

[0003] The telescopic sleeve structure is usually composed of an outer sleeve and an inner sleeve connected to each other. In order to ensure the stability of the sleeve telescopic action, the two sleeves are tightly connected. In order to further reduce the energy loss during telescopic movement, the connection surface of the two sleeves is very smooth, thereby reducing the loss caused by friction during movement. However, working in a dusty environment can easily cause particles to enter the sleeve gap, affecting the flexibility of the sleeve telescopic movement, and seriously exacerbating the sleeve wear, resulting in a short life of the parts.

[0004] As you can imagine, even if the two sleeves are tightly connected, they cannot be absolutely tight, and there is still a certain gap between the two sleeves. Therefore, when the sleeve device is telescopic, the inside of the outer sleeve will be in a negative pressure state, which can easily cause particles to enter and pollute the environment inside the sleeve, reducing the life of the machine. Especially when the sleeve device is running at high speed, the inside of the sleeve device will be in a near-vacuum state for a long time, and dust particles are more likely to enter the sleeve.

[0005] Based on this, the present application proposes a negative pressure dustproof sleeve device for increasing the life of a retractable sleeve structure working in a dusty environment. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a negative pressure dustproof sleeve device, which can improve the structural life of a retractable sleeve working in a dusty environment.

[0007] In order to achieve the above technical effects, the technical solution of the present invention is:

[0008] A negative pressure dustproof sleeve device comprises an inner sleeve and an outer sleeve, wherein the inner sleeve is sleeved in the outer sleeve, and further comprises a dustproof ring fixedly mounted on the top end of the outer sleeve, wherein the dustproof ring comprises a mounting collar and a trumpet-shaped sealing ring, wherein the mounting collar is fixed on the top end of the outer sleeve, wherein the lower portion of the trumpet-shaped sealing ring is integrally formed with the inner wall of the mounting collar, wherein the top of the trumpet-shaped sealing ring is sealingly connected to the radial outer wall of the inner sleeve, wherein the inner wall of the trumpet-shaped sealing ring and the top end face of the outer sleeve form a transition air chamber.

[0009] Preferably, a sealing ring is integrally formed on the fixed side of the horn-shaped sealing ring, and the inner wall of the sealing ring is sealingly connected to the radial outer wall of the inner sleeve.

[0010] Preferably, an air guide groove is provided at the top of the outer sleeve, an air inlet hole is provided on the mounting collar corresponding to the air guide groove, and the air inlet hole is communicated with the transition air chamber through the air guide groove.

[0011] Preferably, the air inlet hole is connected to an air pipe.

[0012] Preferably, a dust filter screen is provided in the air pipe.

[0013] Preferably, the mounting collar extends upward to form an annular baffle.

[0014] Preferably, the dust-proof ring is made of rubber material.

[0015] The present invention has the following characteristics and beneficial effects:

[0016] 1. The present invention can adjust the size according to the actual situation to transform the existing sleeve structure, with strong compatibility;

[0017] 2. The design of the transition air chamber of the present invention can reduce the air pressure difference inside and outside the sleeve structure, and change the target of gas exchange caused by clearance fit from ambient gas to clean gas brought by the air pipe, extending the service life of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the front view of the present invention;

[0020] Figure 2 is the sectional view when the present invention is shortened;

[0021] Figure 3 is the enlarged sectional view of the local part at the junction of the sleeves;

[0022] Figure 4 is the structural schematic diagram of the dust-proof ring.

[0023] 1. Inner sleeve, 2. Air pipe, 2-1. Dust filter screen, 3. Dust-proof ring, 3-1. Mounting collar, 3-2. Horn-shaped sealing ring, 3-3. Transition air chamber, 3-4. Sealing ring, 3-5. Air inlet hole, 4. Outer sleeve, 4-1. Air guide groove. DETAILED DESCRIPTION OF THE INVENTION

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0027] The present invention discloses a negative pressure dust-proof sleeve device, as Figures 1 - 3 shown, which includes an inner sleeve 1 and an outer sleeve 4. The inner sleeve 1 is sleeved inside the outer sleeve 4. It further includes a dust-proof ring 3 fixedly installed at the top of the outer sleeve 4. The dust-proof ring 3 includes an installation sleeve ring 3-1 and a horn-shaped sealing ring 3-2. The installation sleeve ring 3-1 is fixed to the top of the outer sleeve 4. The bottom of the horn-shaped sealing ring 3-2 is integrally formed with the inner wall of the installation sleeve ring 3-1. The top of the horn-shaped sealing ring 3-2 is sealingly connected to the radial outer wall of the inner sleeve 1. An intermediate air chamber 3-3 is formed between the inner wall of the horn-shaped sealing ring 3-2 and the top end face of the outer sleeve 4.

[0028] In the above technical solution, a transition air chamber 3-3 is designed and formed at the junction of the upper outer sleeve 4 and the dust-proof ring 3. Thus, when the outer sleeve 4 and the inner sleeve 1 perform telescopic movements and the inside of the outer sleeve 4 is in a negative pressure state, the clean air in the transition air chamber 3-3 balances the air pressure inside and outside the outer sleeve 4, so as to minimize the air convection with the external dusty environment as much as possible, and further prevent dust particles from entering the gap between the inner sleeve 1 and the outer sleeve 4, thereby extending the service life of the machine.

[0029] Further, a sealing ring 3-4 is integrally formed on the fixed side of the flared sealing ring 3-2, and the inner wall of the sealing ring 3-4 is sealingly connected to the radial outer wall of the inner sleeve 1.

[0030] In the above technical solution, by providing the sealing ring 3-4, the air convection with the external dusty environment is further reduced. And during the small amount of air convection, it can also prevent the entry of dust particles, so as to further ensure that dust particles cannot enter the gap between the inner sleeve 1 and the outer sleeve 4, thereby extending the service life of the machine.

[0031] A further setting of the present invention is as Figure 3 and Figure 4 shown, a gas guiding groove 4-1 is provided at the top of the outer sleeve 4, an air inlet hole 3-5 is provided on the mounting collar 3-1 corresponding to the gas guiding groove 4-1, and the air inlet hole 3-5 is communicated with the transition air chamber 3-3 through the gas guiding groove 4-1. The air inlet hole 3-5 is connected to a trachea 2. A dust filter screen 2-1 is provided in the trachea 2.

[0032] In the above technical solution, by providing the gas guiding groove 4-1, the air inlet hole 3-5 and the trachea 2 that are communicated with the transition air chamber, the transition air chamber 3-3 can be in convection with the outside, so as to prevent the transition air chamber 3-3 from being in a sealed space, and further minimize the entry of air from the external dusty environment through the sealing ring 3-4. In addition, by providing the dust filter screen 2-1 in the trachea 2, the air entering from the trachea is filtered for dust particles to ensure the cleanliness of the air entering the transition air chamber 3-3, thereby further reducing the influence of the dusty environment on the service life of the telescopic structure.

[0033] Further, the mounting collar 3-1 extends upward to form an annular baffle.

[0034] It can be understood that by providing the annular baffle, the influence of environmental dust can be reduced according to the principle that the fewer particulate matters there are the farther away from the ground in the dusty environment.

[0035] Further, the dust-proof ring 3 is made of rubber material.

[0036] It should be noted that the dust-proof ring 3 made of rubber material in this embodiment is an optional material, but is not limited to rubber.

[0037] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations can be made to these embodiments, including components, and still fall within the protection scope of the present invention.

Claims

1. A negative pressure dust-proof sleeve device, comprising an inner sleeve (1) and an outer sleeve (4), the inner sleeve (1) being sleeved inside the outer sleeve (4), characterized in that, It further includes a dust-proof ring (3) fixedly installed at the top end of the outer sleeve (4). The dust-proof ring (3) includes a mounting collar (3-1) and a flared sealing ring (3-2). The mounting collar (3-1) is fixed to the top of the outer sleeve (4). The bottom of the flared sealing ring (3-2) is integrally formed with the inner wall of the mounting collar (3-1). The top of the flared sealing ring (3-2) is sealingly connected to the radial outer wall of the inner sleeve (1). A transition air chamber (3-3) is formed between the inner wall of the flared sealing ring (3-2) and the top end face of the outer sleeve (4). A sealing ring (3-4) is integrally formed on the top side of the flared sealing ring (3-2). The inner wall of the sealing ring (3-4) is sealingly connected to the radial outer wall of the inner sleeve (1). The mounting collar (3-1) extends upward to form an annular baffle.

2. The negative-pressure dust-proof sleeve device according to claim 1, wherein, A gas guide groove (4-1) is provided at the top of the outer sleeve (4). An air inlet hole (3-5) corresponding to the gas guide groove (4-1) is provided on the mounting collar (3-1). The air inlet hole (3-5) is connected to the transition air chamber (3-3) through the gas guide groove (4-1).

3. The negative-pressure dust-proof sleeve device according to claim 2, characterized in that, The air inlet hole (3-5) is connected to a trachea (2).

4. The negative-pressure dust-proof sleeve device according to claim 3, characterized in that, A dust filter screen (2-1) is provided inside the trachea (2).

5. A negative pressure dust-proof sleeve device according to any one of claims 1-4, characterized in that, The dust-proof ring (3) is made of rubber material.

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