Three-stage shafting structure

Abstract

The utility model provides a three-level shafting structure, which belongs to the technical field of air compressors and comprises a shaft body, a first-level pinch roller, a second-level pinch roller and a third-level pinch roller, two ends of the shaft body are respectively a radial shaft head and a thrust shaft head, the first-level pinch roller is positioned on the thrust shaft head, the second-level pinch roller and the third-level pinch roller are sleeved on the radial shaft head at intervals, and the third-level pinch roller is positioned on the thrust shaft head. The second-stage pressing wheel and the third-stage pressing wheel are arranged in a back-to-back mode, and a sealing piece is arranged between the second-stage pressing wheel and the third-stage pressing wheel. According to the three-stage shaft system structure, the first-stage pressing wheel is installed on the thrust shaft head on the shaft body, the second-stage pressing wheel and the third-stage pressing wheel are installed on the radial shaft head at the same time in a back-to-back mode, and the sealing piece is arranged between the second-stage pressing wheel and the third-stage pressing wheel, so that the purpose of second-stage and third-stage separation is achieved, and installation of a three-stage shaft system is completed; according to the three-stage shaft system structure, the purpose of three-stage compression on the same shaft system is achieved, the high-pressure ratio effect is achieved, meanwhile, the size of the shaft system structure is limited, and the requirement for the size and the requirement for the high-pressure ratio are both considered.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compressor technical field, more specifically, relate to a tertiary shafting structure. BACKGROUND

[0002] Traditional air compressor / generator shafting is generally single-stage compression or two-stage compression, with the development of industry, the pressure and flow requirement of air compressor is continuously improved, the traditional single-stage or two-stage air compressor shafting may exist low efficiency. In order to solve the high pressure ratio demand of air compressor, it is mostly needed to increase the volume of air compressor shafting structure or adopt the mode of multiple air compressors in series, resulting in the system volumization, unable to meet the requirement of system space. SUMMARY

[0003] The utility model discloses a tertiary shafting structure, which aims to solve the problems of large volume of air compressor shafting structure and large space occupied by multiple air compressors in series.

[0004] To achieve the above object, the utility model adopts the technical scheme of providing a tertiary shafting structure, which comprises a shaft body, a first-stage compression wheel, a second-stage compression wheel and a third-stage compression wheel. The two ends of the shaft body are a radial shaft head and a thrust shaft head, respectively. The first-stage compression wheel is located at the thrust shaft head. The second-stage compression wheel and the third-stage compression wheel are spaced apart and sleeved on the radial shaft head, and the second-stage compression wheel and the third-stage compression wheel are arranged back to back. There is a sealing element between the second-stage compression wheel and the third-stage compression wheel.

[0005] As another embodiment of the present application, the sealing element comprises a shaft sleeve and an annular sealing portion. The shaft sleeve is sleeved on the radial shaft head. The annular sealing portion is located at the peripheral circumference of the shaft sleeve. The annular sealing portion is located at the middle part of the length direction of the shaft sleeve. The shaft sleeve forms two symmetrical connecting portions on both sides of the annular sealing portion. The two connecting portions are used to connect the second-stage compression wheel and the third-stage compression wheel, respectively.

[0006] As another embodiment of the present application, the annular sealing portion has a horizontal end face at both ends along the length direction of the shaft sleeve. The wheel disc of the second-stage compression wheel and the wheel disc of the third-stage compression wheel are respectively attached to the horizontal end faces on both sides of the annular sealing portion.

[0007] As another embodiment of the present application, the outer edge of the annular sealing portion has a radially concave limiting groove.

[0008] As another embodiment of the present application, the radial shaft head comprises a first extension section, a second extension section and a third extension section connected in sequence, and the outer diameters of the first extension section, the second extension section and the third extension section decrease in sequence, the first extension section is located inside the sheath of the shaft body and is fixed with the sheath; the secondary compression wheel, the sealing element and the tertiary compression wheel are sequentially sleeved on the third extension section, and the end of the secondary compression wheel abuts against the end face of the second extension section.

[0009] As another embodiment of the present application, the free end of the third extension section has a threaded section, a radial end nut is connected with the threaded section, and the radial end nut limits the secondary compression wheel and the tertiary compression wheel.

[0010] As another embodiment of the present application, the thrust shaft head comprises a first support section, a second support section and a third support section connected in sequence, and the outer diameters of the first support section, the second support section and the third support section decrease in sequence, the first support section is located inside the sheath of the shaft body and is fixed with the sheath; the thrust disc and the sealing ring seat are sleeved on the third support section, the thrust disc is attached to the end face of the second support section, and the primary compression wheel is installed at the free end of the third support section and is attached to one end of the sealing ring seat away from the thrust disc.

[0011] As another embodiment of the present application, a bolt hole in the axial direction is formed in the end face of the third support section, and a bolt penetrates through the primary compression wheel and is connected with the bolt hole.

[0012] As another embodiment of the present application, a weight-reducing hole is formed in the second support section and is in communication with the bolt hole.

[0013] As another embodiment of the present application, the sheath of the shaft body has a magnetic steel, and the thrust shaft head and the radial shaft head are located on two sides of the magnetic steel, respectively.

[0014] The three-stage shaft system structure has the advantages that compared with the prior art, the three-stage shaft system structure of the present application installs a primary compression wheel on the thrust shaft head on the shaft body, simultaneously installs a secondary compression wheel and a tertiary compression wheel on the radial shaft head in a back-to-back manner, sets a sealing element between the secondary compression wheel and the tertiary compression wheel to achieve the purpose of separating the secondary compression wheel and the tertiary compression wheel, and completes the installation of the three-stage shaft system; the above three-stage shaft system structure achieves the purpose of three-stage compression on the same shaft system, achieves the effect of high pressure ratio, limits the volume of the shaft system structure, and meets the requirements of volume and high pressure ratio. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the technical problems to be solved by the utility model, the technical scheme and the beneficial effects clearer and clearer, the utility model will be further described in detail below in combination with the drawings and the embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0016] Figure 1 The structure diagram of the three-stage shafting structure provided by the utility model embodiment is shown in the figure.

[0017] Figure 2 The sectional structure diagram of the three-stage shafting structure provided by the utility model embodiment is shown in the figure.

[0018] Figure 3 The structure diagram of the sealing member provided by the utility model embodiment is shown in the figure.

[0019] Figure 4 The front view of the sealing member provided by the utility model embodiment is shown in the figure.

[0020] In the figure: 1, sheath; 2, radial shaft head; 3, thrust shaft head; 4, thrust disc; 5, primary pressure roller; 6, secondary pressure roller; 7, tertiary pressure roller; 8, sealing ring seat; 9, bolt; 10, weight reduction hole; 11, magnetic steel; 12, sealing member; 13, annular sealing part; 14, limiting groove. DETAILED DESCRIPTION

[0021] In order to make the technical problems to be solved by the utility model, the technical scheme and the beneficial effects clearer and clearer, the utility model will be further described in detail below in combination with the drawings and the embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0022] Please refer to Figures 1 to 4 The three-stage shafting structure provided by the utility model will be described now. The three-stage shafting structure comprises a shaft body, a primary pressure roller 5, a secondary pressure roller 6 and a tertiary pressure roller 7. The two ends of the shaft body are a radial shaft head 2 and a thrust shaft head 3 respectively. The primary pressure roller 5 is located at the thrust shaft head 3. The secondary pressure roller 6 and the tertiary pressure roller 7 are spaced and sleeved on the radial shaft head 2. The secondary pressure roller 6 and the tertiary pressure roller 7 are arranged back to back. The sealing member 12 is arranged between the secondary pressure roller 6 and the tertiary pressure roller 7.

[0023] Compared with the prior art, the three-stage shaft system structure is characterized in that a first-stage compression wheel 5 is installed on the thrust shaft head 3 of the shaft body, a second-stage compression wheel 6 and a third-stage compression wheel 7 are simultaneously installed on the radial shaft head 2 in a back-to-back manner, a sealing element 12 is arranged between the second-stage compression wheel 6 and the third-stage compression wheel 7 to achieve the purpose of separating the second stage and the third stage, and the installation of the three-stage shaft system is completed.

[0024] In some possible embodiments, referring to Figures 2 to 4 The sealing element 12 comprises a shaft sleeve and an annular sealing portion 13, the shaft sleeve is sleeved on the radial shaft head 2, the annular sealing portion 13 is located in the peripheral direction of the shaft sleeve, the annular sealing portion 13 is located in the middle of the length direction of the shaft sleeve, the shaft sleeve forms two symmetrical connecting portions on both sides of the annular sealing portion 13, and the two connecting portions are respectively used for connecting the second-stage compression wheel 6 and the third-stage compression wheel 7.

[0025] The sealing element 12 located between the second-stage compression wheel 6 and the third-stage compression wheel 7 is formed by combination of the shaft sleeve and the annular sealing portion 13, the shaft sleeve is sleeved on the end of the radial shaft head 2 of the shaft body, the shaft sleeve is installed on the rear end of the second-stage compression wheel 6 after the installation of the second-stage compression wheel 6, and the shaft sleeve moves to be attached to the second-stage compression wheel 6. The connecting portion, close to the second-stage compression wheel 6, of the shaft sleeve extends into the middle shaft connecting groove of the second-stage compression wheel 6, and the connecting portion, away from the second-stage compression wheel 6, of the shaft sleeve is used for connecting the middle shaft connecting groove of the third-stage compression wheel 7. Under the action of the shaft sleeve, the second-stage compression wheel 6 and the third-stage compression wheel 7 are arranged in a back-to-back manner.

[0026] The annular sealing portion 13 is located in the middle of the length direction of the shaft sleeve, the annular sealing portion 13 is annularly arranged in the peripheral direction of the shaft sleeve and extends outward along the radial direction of the shaft sleeve. The annular sealing portion 13 has a certain thickness, is used for connecting the shell of the air compressor, and separately isolates the second-stage compression wheel 6 and the third-stage compression wheel 7 in the two volute chambers, so as to realize the sealing of the connection positions of the second-stage compression and the third-stage compression.

[0027] Optionally, the annular sealing portion 13 is in a ring disc structure, a limiting groove 14 is formed in the outer edge of the annular sealing portion 13, the depth direction of the limiting groove 14 is consistent with the radial direction of the annular sealing portion 13, and the width direction of the limiting groove 14 is consistent with the thickness direction of the annular sealing portion 13. The limiting groove 14 is used for connecting and limiting the volute, so as to achieve the effect of sealing and isolating the inner cavities of the two volutes.

[0028] In some possible embodiments, referring to Figure 2The radial shaft head 2 comprises a first extension section, a second extension section and a third extension section connected in sequence, and the outer diameters of the first extension section, the second extension section and the third extension section decrease in sequence, the first extension section is located inside the sheath 1 of the shaft body and is fixed with the sheath 1; the second pressure roller 6, the sealing element 12 and the third pressure roller 7 are sequentially sleeved on the third extension section, and the end of the second pressure roller 6 abuts against the end face of the second extension section.

[0029] The radial shaft head 2 is divided into three parts according to the diameters, i.e. the first extension section, the second extension section and the third extension section. The three parts gradually extend from the side close to the sheath 1 to the side away from the sheath 1, the diameters of the three parts decrease in sequence along the extending direction, and the three parts are coaxial all the time. The above three parts are an integral whole and can be integrally machined by a lathe.

[0030] The first extension section is installed in the sheath 1, and the connecting surface between the first extension section and the second extension section forms a step surface due to the diameter difference of the two parts, which is flush with the end face of the sheath 1. In the installation, the first extension section is inserted into the inner cavity of the sheath 1 until the step surface is flush with the end face of the sheath 1, and then the gap between the step surface and the sheath 1 is welded to fix the first extension section and the sheath 1.

[0031] The diameter of the second extension section is smaller than that of the first extension section, which provides a space for the welding seam between the first extension section and the sheath 1. The second extension section extends along the axial direction as an extension section and is mainly used for supporting and bearing, and the end thereof is connected with the third extension section. The diameter of the third extension section is the smallest, and the third extension section is used for installing the second pressure roller 6 and the third pressure roller 7, and the diameter thereof is consistent with the installation hole of the central shaft of the two pressure rollers.

[0032] The free end of the third extension section has a threaded section, the threaded section is connected with a radial end nut, and the radial end nut limits the second pressure roller 6 and the third pressure roller 7.

[0033] In the installation, the second pressure roller 6, the sealing element 12 and the third pressure roller 7 are sequentially installed on the third extension section until the front end of the second pressure roller 6 abuts against the end face of the second extension section. A section of the connecting part of the sealing element 12 is inserted into the central shaft connecting groove of the second pressure roller 6, and the side end face of the annular sealing part 13 of the sealing element 12 is attached to the back of the wheel disc of the second pressure roller 6. Then the third pressure roller 7 is installed, the wheel disc of the third pressure roller 7 is installed on the third extension section, the central shaft connecting groove of the third pressure roller 7 is sleeved with the second section of the connecting part of the sealing element 12, and the back of the wheel disc of the third pressure roller 7 is attached to the other side end face of the annular sealing part 13 of the sealing element 12; finally, the radial end nut is installed, the radial end nut is abutted on the end face of the third pressure roller 7, and limits the above-mentioned second pressure roller 6 and the sealing element 12, thereby completing the positioning of the components.

[0034] In some possible embodiments, please refer to Figure 2, the thrust shaft head 3 comprises first support section, second support section and third support section connected in turn, and the outer diameter of the first support section, the second support section and the third support section decreases in turn, the first support section is located inside the sheath 1 of the shaft body and is fixed with the sheath 1; the third support section is sleeved with the thrust disc 4 and the seal ring seat 8, the thrust disc 4 is attached to the end face of the second support section, and the first-stage pressing wheel 5 is installed on the free end of the third support section and is attached to one end of the seal ring seat 8 away from the thrust disc 4.

[0035] The thrust shaft head 3 is installed at the other end of the sheath 1, and the thrust shaft head 3 is symmetrically arranged with the radial shaft head 2. The thrust shaft head 3 is also divided into three parts according to the diameter, namely the first support section, the second support section and the third support section. The three parts gradually extend from the side close to the sheath 1 to the side away from the sheath 1, the diameters of the three parts gradually decrease along the direction of extension, and the three parts are coaxial at all times. The above three parts are an integral whole and can be integrally machined by a lathe.

[0036] The first support section is installed in the sheath 1, and the connecting surface of the first support section and the second support section forms a step surface due to the diameter difference of the two parts, which is flush with the end surface of the sheath 1 towards the thrust shaft head 3. During installation, the first support section is inserted into the inner cavity of the sheath 1 until the step surface formed by the first support section and the second support section is flush with the end surface of the sheath 1, and then the gap between the step surface and the sheath 1 is welded to fixedly connect the first support section with the sheath 1. The installed thrust shaft head 3 is symmetrical with the radial shaft head 2.

[0037] The diameter of the second support section is smaller than that of the first support section, which provides space for the welding seam between the first support section and the sheath 1. The second support section extends along the axial direction as an extension section, mainly for supporting and bearing, and the end thereof is connected with the third support section. The third support section has the smallest diameter, and the third support section is used for installing the thrust disc 4 and the seal ring seat 8. The end of the third support section has a protrusion extending along the axial direction, the outer diameter of the protrusion is smaller than that of the third support section, and the protrusion is coaxial with the third support section. The protrusion is used for installing the first-stage pressing wheel 5, and the diameter thereof is consistent with the inner diameter of the middle shaft installation groove in the first-stage pressing wheel 5.

[0038] The middle shafts of the first-stage pressing wheel 5, the second-stage pressing wheel 6 and the third-stage pressing wheel 7 have consistent hollow structures, which are all installation holes in the front half and middle shaft installation grooves in the rear half, the cross section of the middle shaft installation groove is circular, and the inner diameter of the middle shaft installation groove is larger than that of the installation hole.

[0039] The above describes that the inner diameter of the third extension section is consistent with that of the installation hole of the pressing wheel, and the inner diameter of the third support section on the other side is consistent with that of the middle shaft installation groove of the pressing wheel.

[0040] The end surface of the third supporting section is provided with a bolt hole 9 along the axial direction, the bolt 9 penetrates the primary pressing wheel 5 and is connected with the bolt hole 9. Since the end of the third supporting section has a protruding part, the bolt hole 9 penetrates the protruding part and the body of the third supporting section along the axial direction.

[0041] In the installation of the primary pressing wheel 5, firstly, the thrust disc 4 and the sealing ring seat 8 are sequentially sleeved on the third supporting section, the thrust disc 4 is abutted on the end surface of the second supporting section, the sealing ring seat 8 is abutted on the other side of the thrust disc 4, and the other side surface of the sealing ring seat 8 is flush with the end surface of the third supporting section; then the primary pressing wheel 5 is sleeved on the protruding part of the end of the third supporting section, the back surface of the wheel disc of the primary pressing wheel 5 is abutted on the side of the sealing ring seat 8 away from the thrust disc 4; at this time, the mounting hole of the primary pressing wheel 5 and the bolt hole 9 are coaxial and have the same inner diameter. Then the bolt 9 penetrates the mounting hole of the primary pressing wheel 5 and extends into the bolt hole 9. The bolt 9 connects the third supporting section, and the nut at the end of the bolt 9 fixes the primary pressing wheel 5 on the third supporting section.

[0042] In order to keep the balance of the shaft system, the second supporting section is provided with a weight-reducing hole 10, which is communicated with the bolt hole 9.

[0043] In addition, the sheath 1 of the shaft body is provided with a magnetic steel 11, and the thrust shaft head 3 and the radial shaft head 2 are respectively located on the two sides of the magnetic steel 11. In the installation, firstly, one of the shaft heads is installed at one end of the sheath 1, then the magnetic steel 11 is put in, and then the other shaft head is fixedly connected at the other end of the sheath 1.

[0044] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A three-stage shaft system structure, characterized in that, It includes a shaft, a first-stage pressure roller (5), a second-stage pressure roller (6), and a third-stage pressure roller (7). The two ends of the shaft are a radial shaft head (2) and a thrust shaft head (3), respectively. The first-stage pressure roller (5) is located on the thrust shaft head (3). The second-stage pressure roller (6) and the third-stage pressure roller (7) are spaced apart and sleeved on the radial shaft head (2), and the second-stage pressure roller (6) and the third-stage pressure roller (7) are arranged in opposite directions. A seal (12) is provided between the second-stage pressure roller (6) and the third-stage pressure roller (7).

2. The three-stage shaft system structure as described in claim 1, characterized in that, The sealing element (12) includes a bushing and an annular sealing part (13). The bushing is sleeved on the radial shaft head (2). The annular sealing part (13) is located in the circumferential direction of the bushing and in the middle of the length direction of the bushing. The bushing forms two symmetrical connecting parts on both sides of the annular sealing part (13). The two connecting parts are used to connect the secondary pressure roller (6) and the tertiary pressure roller (7), respectively.

3. The three-stage shaft system structure as described in claim 2, characterized in that, The annular sealing part (13) has horizontal end faces at both ends along the length direction of the bushing, and the discs of the secondary pressure roller (6) and the tertiary pressure roller (7) are respectively attached to the horizontal end faces on both sides of the annular sealing part (13).

4. The three-stage shaft system structure as described in claim 2, characterized in that, The outer edge of the annular sealing part (13) has a radially recessed limiting groove (14).

5. The three-stage shaft system structure as described in claim 1, characterized in that, The radial shaft head (2) includes a first extension section, a second extension section and a third extension section connected in sequence, and the outer diameters of the first extension section, the second extension section and the third extension section decrease in sequence. The first extension section is located inside the sheath (1) of the shaft body and is fixed to the sheath (1). The secondary pressure roller (6), the seal (12) and the tertiary pressure roller (7) are sequentially sleeved on the third extension section, and the end of the secondary pressure roller (6) abuts against the end face of the second extension section.

6. The three-stage shaft system structure as described in claim 5, characterized in that, The free end of the third extension has a threaded section, which is connected to a radial end nut. The radial end nut limits the secondary pressure roller (6) and the tertiary pressure roller (7).

7. The three-stage shaft system structure as described in claim 1, characterized in that, The thrust shaft head (3) includes a first support section, a second support section and a third support section connected in sequence, and the outer diameters of the first support section, the second support section and the third support section decrease in sequence. The first support section is located inside the sheath (1) of the shaft body and is fixed to the sheath (1). A thrust plate (4) and a sealing ring seat (8) are sleeved on the third support section. The thrust plate (4) is attached to the end face of the second support section. The first-stage pressure roller (5) is installed at the free end of the third support section and is attached to the end of the sealing ring seat (8) away from the thrust plate (4).

8. The three-stage shaft system structure as described in claim 7, characterized in that, The end face of the third support section is provided with an axial bolt (9) hole, and the bolt (9) passes through the first-stage pressure roller (5) and is connected to the bolt (9) hole.

9. The three-stage shaft system structure as described in claim 8, characterized in that, The second support section has a weight reduction hole (10) which is connected to the bolt (9) hole.

10. The three-stage shaft system structure as described in claim 1, characterized in that, The sheath (1) of the shaft body contains a magnet (11), and the thrust shaft head (3) and the radial shaft head (2) are located on both sides of the magnet (11).

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