Shaft sealing structure of air compressor

Abstract

The utility model relates to the technical field of compressor shaft sealing, in particular to a shaft sealing structure of an air compressor, which comprises a stuffing box sleeved outside a shaft body, a stuffing gap is formed between the shaft body and the stuffing box, a pre-tightening gland and a filler are arranged in the stuffing gap in a sliding manner, a driving component is fixedly arranged in an inner cavity of the stuffing box, and the driving component is fixedly connected with the shaft body. The driving assembly is used for driving the pre-tightening gland to move in the axial direction of the shaft body, and a pressing assembly is movably arranged on the side, away from the pre-tightening gland, of the stuffing box and used for driving the driving assembly to move. The driving assembly capable of driving the pre-tightening gland to extrude the filler is arranged in the stuffing box, the effect that the gland on one side drives the gland on the other side to move synchronously is achieved through movement of the filler gland on the other side, the glands on the two sides move relatively, and the effect that the two sides of the filler are evenly extruded is achieved; the distribution of extrusion force is more uniform, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressor shaft seals, in particular to a shaft seal structure for an air compressor. Background Art

[0002] An air compressor, also known as an air compressor, is a device used to compress gas. Its primary function is to convert the mechanical energy of a prime mover into the pressure energy of air. It is the core component of an air source device. By compressing gas, an air compressor can produce high-pressure gas to meet the needs of various equipment and projects.

[0003] In order to prevent the leakage of gas and oil inside the existing air compressor during operation, a structure is required at the end of the rotating shaft to prevent the leakage of liquid, gas or solid matter from the connecting part of the shaft, namely the shaft seal structure. One of the sealing methods is the packing seal, in which an annular packing material is inserted between the stuffing box and the rotating shaft. Finally, a packing gland is used on the outside of the shaft to squeeze the packing material inward, and finally fix it to achieve the seal.

[0004] However, this method usually involves pushing the packing material on one side from the outside of the compressor to extrude it. The packing material is usually composed of multiple packing rings. This will result in the packing material in the packing gap being stressed on only one side while the other side is not stressed, resulting in uneven force distribution and possibly loose compression of the packing material, which may affect the sealing effect. To this end, we have proposed an air compressor shaft seal structure to effectively address the above drawbacks. Utility Model Content

[0005] The purpose of the present utility model is to provide a shaft sealing structure for an air compressor, so as to solve the problems raised in the above background technology.

[0006] The utility model is realized by the following technical solutions: a shaft sealing structure of an air compressor, comprising a stuffing box sleeved on the outside of a shaft body, a stuffing gap formed between the shaft body and the stuffing box, a pre-tightening gland and a stuffing material slidingly provided in the stuffing gap, the pre-tightening gland being used to push the stuffing material to move;

[0007] A driving cavity is defined inside the stuffing box, and a driving assembly is fixed inside the driving cavity. The driving assembly is used to drive the pre-tightening gland to move along the axial direction of the shaft body.

[0008] A pressing assembly is movably provided on one side of the stuffing box away from the pre-tightening gland, and the pressing assembly is used to drive the driving assembly to move.

[0009] Optionally, the drive assembly includes a mounting plate fixedly connected to the inner wall of the drive cavity, the mounting plate is arranged along the axial direction of the shaft body, and a first slider and a second slider are connected to the mounting plate in an axial sliding manner along the shaft body. The first slider and the second slider are arranged to move relative to each other, and a connecting rod is fixedly connected to the upper surface of the second slider, and the top end of the connecting rod extends into the packing gap and is fixedly connected to the pre-tightening cover; a driving port for the connecting rod to pass through is opened between the drive cavity and the packing gap.

[0010] Optionally, the first sliding block and the second sliding block are rotatably connected to a first connecting rod and a second connecting rod respectively, and the other ends of the first connecting rod and the second connecting rod are rotatably connected to the same point.

[0011] Optionally, a slide rail is vertically arranged in the driving cavity, a slide seat is vertically slidably connected to the slide rail, and the first connecting rod and the second connecting rod are both rotatably connected to the slide seat.

[0012] Optionally, the clamping assembly includes a packing gland slidingly sleeved on the outside of the shaft body, the packing gland is used to push the filler to move in the direction of the pre-tightening gland, and a push rod is fixed on the side of the packing gland facing the side of the stuffing box, and the other end of the push rod extends into the driving cavity and passes horizontally through the side wall of the mounting plate to abut against the first slider.

[0013] Optionally, a fixed block is fixed at the middle position of the mounting plate, and return springs are abutted on the left and right sides of the fixed block, and the other ends of the two return springs abut on the first slider and the second slider respectively; in the natural state, the return springs are in a compressed state.

[0014] Compared with the prior art, the present invention provides a shaft sealing structure for an air compressor, which has the following beneficial effects:

[0015] The utility model opens a driving cavity inside the stuffing box, and is provided with a driving component in the cavity that can drive the pre-tightening cover to extrude the filler. By utilizing the movement of the packing cover on the other side, the cover on one side drives the cover on the other side to move synchronously, so that the covers on both sides move relatively, thereby achieving the effect of uniformly squeezing the filler on both sides, making the distribution of the squeezing force more uniform, making the filler fit more tightly, and improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 This is a front cross-sectional structural diagram of the present utility model;

[0018] Figure 3 for Figure 2Enlarged structural diagram at point A in the middle.

[0019] In the figure: 1. Shaft; 2. Stuffing box; 201. Drive cavity; 202. Drive port; 3. Packing gap; 4. Pre-tightening cover; 5. Filling material; 6. Drive assembly; 601. Mounting plate; 602. First slider; 603. Second slider; 604. Connecting rod; 605. First connecting rod; 606. Second connecting rod; 607. Slide rail; 608. Slide seat; 7. Clamping assembly; 701. Packing cover; 702. Push rod; 8. Fixed block; 801. Return spring; 9. Side wall of machine body. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 - Figure 3 , a shaft sealing structure of an air compressor, comprising a stuffing box 2 sleeved on the outside of a shaft body 1. In this embodiment, the installation method of the stuffing box 2 is as follows Figure 2 As shown, the compressor body side wall 9 is clamped at the middle position of the stuffing box 2, so that one side of the stuffing box 2 is located inside the compressor and the other side is located outside the compressor.

[0022] A packing gap 3 is formed between the shaft 1 and the stuffing box 2. A pre-tightening gland 4 and a packing material 5 are slidingly provided in the packing gap 3. The pre-tightening gland 4 is used to push the packing material 5 to move so that the pre-tightening gland 4 can squeeze the packing material 5 together, thereby achieving a sealing effect. A driving cavity 201 is provided inside the stuffing box 2. A driving assembly 6 is fixedly provided in the driving cavity 201. The driving assembly 6 is used to drive the pre-tightening gland 4 to move axially along the shaft 1. In this embodiment, the pre-tightening gland 4 is located on the side of the packing gap 3 close to the interior of the compressor. Therefore, the staff cannot directly contact the pre-tightening gland 4. A driving assembly 6 that can drive the pre-tightening gland 4 to move is provided in the stuffing box 2, so that the staff can control the movement of the pre-tightening gland 4 through the driving assembly 6.

[0023] In order to enable the staff to control the driving component 6 more conveniently and thus realize the driving of the pre-tightening cover 4, the present application provides a clamping component 7 on the side of the stuffing box 2 away from the pre-tightening cover 4. The clamping component 7 is used to drive the driving component 6 to move, so that when the staff uses the clamping component 7 to drive the driving component 6 to start moving, the movement of the pre-tightening cover 4 can be realized.

[0024] The structure of the drive assembly 6 is described in detail below to make the process of the drive assembly 6 driving the pre-tightening cover 4 to move more clear:

[0025] The drive assembly 6 includes a mounting plate 601 fixedly connected to the inner wall of the drive cavity 201. The mounting plate 601 is arranged along the axial direction of the shaft body 1. A first slider 602 and a second slider 603 are slidably connected to the mounting plate 601 along the axial direction of the shaft body 1. The first slider 602 and the second slider 603 are arranged to move relative to each other, so that the first slider 602 and the second slider 603 either move away from each other or move toward each other during movement, thereby achieving the effect of synchronous movement toward the filler 5. A connecting rod 604 is fixedly connected to the upper surface of the second slider 603, and the top end of the connecting rod 604 extends into the packing gap 3 and is fixedly connected to the pre-tightening cover 4. Therefore, when the second slider 603 moves toward the filler 5, it will drive the connecting rod 604 and the pre-tightening cover 4 to move toward the filler 5, thereby squeezing the filler 5.

[0026] It should be noted that, in this embodiment, Figure 3 As shown, a driving port 202 for the connecting rod 604 to pass through is provided between the driving cavity 201 and the packing gap 3. When the connecting rod 604 moves to the end of the driving port 202, that is, touches the side wall of the stuffing box 2, all the packing materials 5 are compressed together so that the packing materials 5 will not be located at the position of the above-mentioned driving port 202, thereby avoiding leakage of gas or liquid, thereby achieving a sealing effect.

[0027] Furthermore, the first slider 602 and the second slider 603 are rotatably connected to the first connecting rod 605 and the second connecting rod 606, respectively, and the other ends of the first connecting rod 605 and the second connecting rod 606 are rotatably connected to the same point, so that when the first slider 602 moves, it can drive the first connecting rod 605 to move, and the movement of the first connecting rod 605 will affect the state of the second connecting rod 606, and the second connecting rod 606 will eventually affect the movement state of the second slider 603. A slide rail 607 is vertically provided in the driving cavity 201, and a slide seat 608 is vertically slidably connected to the slide rail 607. The first connecting rod 605 and the second connecting rod 606 are both rotatably connected to the slide seat 608. Figure 3As shown, when the first slider 602 moves toward the filling material 5, the first slider 602 will drive the first connecting rod 605 and the end connected to the first slider 602 to move synchronously toward the middle, and the other end of the first connecting rod 605 will drive the slide 608 to move, and the slide 608 is vertically slidably connected to the slide rail 607, so that the slide 608 will move vertically downward; as the slide 608 moves downward, the second connecting rod 606 and the end connected to the slide 608 will move downward synchronously, thereby driving the second connecting rod 606 and the end connected to the second slider 603 to move toward the middle, realizing the process of synchronous relative movement of the first slider 602 and the second slider 603, and the second slider 603 is fixedly connected to the pre-tightening cover 4 through the connecting rod 604, so that the process of synchronous relative movement of the first slider 602 and the pre-tightening cover 4 is finally realized.

[0028] In order to enable the solution to ultimately achieve the effect of synchronously squeezing the filler 5 on both sides of the filler gap 3, the pressing assembly 7 is described below:

[0029] The clamping assembly 7 includes a stuffing gland 701 that is slidably mounted on the outside of the shaft body 1. The stuffing gland 701 is used to push the filler 5 toward the pre-tightening gland 4. A push rod 702 is fixed on the side of the stuffing gland 701 facing the side of the stuffing box 2. The other end of the push rod 702 extends into the inner cavity of the stuffing box 2 and passes horizontally through the side wall of the mounting plate 601 to abut against the first slider 602. When the packing cover 701 is put on the outside of the shaft body 1, one side of the packing cover 701 is extended into the packing gap 3 and aligned with the packing material 5. Then the packing cover 701 is pushed in the direction of the packing material 5 to squeeze the packing material 5. At the same time, the push rod 702 on the packing cover 701 will pass through the holes on the side of the stuffing box 2 and the mounting plate 601, and finally abut against the side of the first slider 602. When the packing cover 701 squeezes the packing material 5 toward the middle, the push rod 702 will synchronously push the first slider 602 to move toward the middle, and finally the above process is transmitted to the second slider 603, so that the first slider 602 and the second slider 603 move synchronously toward the middle, and finally the packing cover 701 and the pre-tightening cover 4 move synchronously toward the packing material 5, so as to achieve the purpose of squeezing the packing material 5 on both sides, make the force more uniform, and prevent the packing material 5 from being subjected to force on only one side, resulting in insufficient squeezing on the other side, affecting the final sealing effect.

[0030] In order to enable the first slider 602 and the second slider 603 to return to the two ends of the mounting plate 601 after the clamping assembly 7 is disassembled, so as to facilitate the extrusion of the filler 5 next time, the present application fixes a fixed block 8 at the middle position of the mounting plate 601, and the left and right sides of the fixed block 8 are abutted with return springs 801, and the other ends of the two return springs 801 are respectively abutted on the first slider 602 and the second slider 603. In the natural state, the return spring 801 is in a compressed state, so that the first slider 602 will be reset to the end of the mounting plate 601 by the return spring 801 after there is no pressure from the push rod 702, and the second slider 603 will also complete the reset synchronously.

[0031] The working principle and usage process of the present invention are as follows: First, when using and installing, the stuffing box 2 is first sleeved on the outside of the shaft body 1, so that the pre-tightening cover 4 is also sleeved on the outside of the shaft body 1. At this time, the packing material 5 is put into the packing gap 3 from the side of the stuffing box 2 away from the pre-tightening cover 4. The packing material 5 is also sleeved on the outside of the shaft body 1. After the packing material 5 is placed, it can be squeezed to achieve packing sealing.

[0032] The packing gland 701 is aligned with the packing gap 3 and extended into the packing gap 3, so that the push rod 702 is extended into the driving cavity 201, passes through the side wall of the mounting plate 601 and finally abuts against the side of the first slider 602, and then the packing gland 701 is pushed to make the packing gland 701 start to squeeze the packing material 5. At this time, the push rod 702 will push the first slider 602 to move toward the middle of the mounting plate 601. The first slider 602 is driven by the first connecting rod 605 to drive the slide 608 to move vertically downward on the slide rail 607. The slide rail 607 Through the transmission of the second connecting rod 606, the second slider 603 is driven to move toward the middle of the mounting plate 601. The second slider 603 is fixedly connected to the pre-tightening cover 4 through the connecting rod 604, so that the second slider 603 drives the pre-tightening cover 4 to move synchronously, and finally the packing cover 701 pushes the packing material 5 toward the middle while the pre-tightening cover 4 will simultaneously push the packing material 5 on the other side of the packing material 5, so as to achieve the purpose of synchronously squeezing the two sides of the packing material 5, so that the force on both sides is even, and insufficient squeezing on one side is avoided, resulting in poor sealing effect.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shaft sealing structure for an air compressor, comprising a stuffing box (2) sleeved on the outside of a shaft (1), characterized in that: A packing gap (3) is formed between the shaft (1) and the stuffing box (2), and a pre-tightening cover (4) and a packing material (5) are slidably provided in the packing gap (3), and the pre-tightening cover (4) is used to push the packing material (5) to move; A driving cavity (201) is provided inside the stuffing box (2), a driving assembly (6) is fixedly provided inside the driving cavity (201), and the driving assembly (6) is used to drive the pre-tightening cover (4) to move axially along the shaft body (1); A pressing assembly (7) is movably provided on a side of the stuffing box (2) away from the pre-tightening cover (4), and the pressing assembly (7) is used to drive the driving assembly (6) to move.

2. The shaft sealing structure of an air compressor according to claim 1, characterized in that: The driving assembly (6) includes a mounting plate (601) fixedly connected to the inner wall of the driving cavity (201), the mounting plate (601) is arranged along the axial direction of the shaft body (1), and a first slider (602) and a second slider (603) are connected to the mounting plate (601) in a sliding manner along the axial direction of the shaft body (1), the first slider (602) and the second slider (603) are arranged to move relative to each other, a connecting rod (604) is fixedly connected to the upper surface of the second slider (603), and the top end of the connecting rod (604) extends into the packing gap (3) and is fixedly connected to the pre-tightening cover (4); a driving port (202) for the connecting rod (604) to pass through is opened between the driving cavity (201) and the packing gap (3).

3. The shaft sealing structure of an air compressor according to claim 2, characterized in that: The first slider (602) and the second slider (603) are rotatably connected to a first connecting rod (605) and a second connecting rod (606), respectively, and the other ends of the first connecting rod (605) and the second connecting rod (606) are rotatably connected to the same point.

4. The shaft sealing structure of an air compressor according to claim 3, characterized in that: A slide rail (607) is vertically arranged in the driving cavity (201), and a slide seat (608) is vertically slidably connected to the slide rail (607). The first connecting rod (605) and the second connecting rod (606) are both rotatably connected to the slide seat (608).

5. The shaft sealing structure of an air compressor according to claim 4, characterized in that: The clamping assembly (7) includes a stuffing gland (701) that is slidably mounted on the outside of the shaft (1). The stuffing gland (701) is used to push the stuffing material (5) toward the pre-tightening gland (4). A push rod (702) is fixedly provided on the side of the stuffing gland (701) facing the side of the stuffing box (2). The other end of the push rod (702) extends into the driving cavity (201) and laterally passes through the side wall of the mounting plate (601) to abut against the first slider (602).

6. The shaft sealing structure of an air compressor according to claim 4, characterized in that: A fixing block (8) is fixedly provided at the middle position of the mounting plate (601), and return springs (801) are respectively abutted on the left and right sides of the fixing block (8), and the other ends of the two return springs (801) are respectively abutted on the first slider (602) and the second slider (603); in a natural state, the return springs (801) are in a compressed state.

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