Fastening tool for impeller

Abstract

The utility model relates to a fastening tool for an impeller. The device comprises a pull nut which is used for being connected with a second end of a compression screw rod; the end, axially away from the pressing screw, of the pull nut extends outwards in the radial direction to form a boss. The hydraulic cylinder core is sleeved outside the pull nut and comprises a first shaft section and a second shaft section which are connected with each other; the hydraulic cylinder sleeve comprises a first stepped hole; the first stepped hole comprises a first hole section I matched with the first shaft section and a first hole section II matched with the second shaft section, and a pressure cavity for introducing pressure oil is formed between the second shaft section and the bottom wall of the first hole section II; the thrust barrel is provided with a second stepped hole, the second stepped hole comprises a first hole section and a second hole section, the first end of the thrust barrel can abut against the gasket, and the second end of the thrust barrel abuts against the first end of the hydraulic cylinder sleeve. Axial thrust generated by pressure oil is used for fastening, interference of friction coefficient fluctuation on fastening force precision is effectively avoided, and reliability of the fastening effect of the impeller is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field especially is a kind of fastening tool of impeller. BACKGROUND

[0002] In the existing single-stage high-speed centrifugal fan, the fastening force control of impeller and rotating shaft coupling is mostly realized by controlling the torque of compression nut (mostly using torque wrench), due to the influence of surface processing quality and on-site environment, the uncertain friction coefficient makes the actual fastening force and design value greatly different. Especially in high-pressure fan, due to the limitation of impeller material strength, the safety factor of impeller and rotating shaft coupling is very small, and the existing technology cannot meet its precision. SUMMARY

[0003] Therefore, the utility model provides a kind of fastening tool of impeller, adopts hydraulic control mode, utilizes the axial thrust generated by pressure oil to fasten, effectively avoids the interference of friction coefficient fluctuation to fastening force precision, to significantly improve the reliability of impeller fastening.

[0004] To solve the above technical problems, the utility model provides a kind of fastening tool of impeller, the axial side of impeller is provided with rotating shaft, the first end of compression screw rod passes through the center through-hole of the impeller and is connected with the rotating shaft, the second end of the compression screw rod extends to the axial other side of the impeller and is provided with washer and compression nut thereon, the fastening tool includes:

[0005] Pull mother, for being connected with the second end of the compression screw rod;The one end of the pull mother axially away from the compression screw rod extends radially outward and has boss;

[0006] Hydraulic cylinder core, sleeve is set to the pull mother outer, including the first shaft section and the second shaft section of mutual link;The diameter of the first shaft section is less than the diameter of the second shaft section, the second shaft section is abutted with the boss and extends radially outward and has limit step;

[0007] Hydraulic cylinder sleeve, the first end and the second end of the hydraulic cylinder sleeve are provided with first step hole and are arranged axially;The first step hole includes the first hole section one matched with the first shaft section and the first hole section two matched with the second shaft section, the second shaft section and the bottom wall of the first hole section two form pressure cavity for entering pressure oil, the second end of the hydraulic cylinder sleeve is abutted with the limit step;

[0008] The thrust cylinder body is provided with a second stepped hole, the second stepped hole comprises second hole sections one and two with different diameters, the second hole section one can be sleeved outside the fastening nut, and the first shaft section extends into the second hole section two; the thrust cylinder body comprises first and second ends arranged in opposite directions, the first end of the thrust cylinder body can abut against the gasket, and the second end of the thrust cylinder body abuts against the first end of the hydraulic cylinder sleeve.

[0009] In an embodiment of the utility model, the radial outer end of the hydraulic cylinder sleeve is provided with an oil injection hole in communication with the pressure cavity.

[0010] In an embodiment of the utility model, the oil injection hole is a threaded hole and is connected to the outlet of the hydraulic pump.

[0011] In an embodiment of the utility model, the outlet of the hydraulic pump is provided with a pressure gauge to obtain the oil pressure value in the pressure cavity.

[0012] In an embodiment of the utility model, the end face of the thrust cylinder body is provided with a notch penetrating into the second hole section one to expose the fastening nut.

[0013] In an embodiment of the utility model, the central through hole of the hydraulic cylinder core is in clearance fit with the pull mother gap.

[0014] In an embodiment of the utility model, the first shaft section is in clearance fit with the first hole section one; and the second shaft section is in clearance fit with the first hole section two.

[0015] In an embodiment of the utility model, the first shaft section is in clearance fit with the second hole section two.

[0016] In an embodiment of the utility model, a first sealing member is arranged between the first shaft section and the first hole section one; and a second sealing member is arranged between the second shaft section and the first hole section two.

[0017] In an embodiment of the utility model, under the action of pressure oil in the pressure cavity, a first axial thrust surface is formed between the second shaft section and the boss, and a second axial thrust surface is formed between the second end of the thrust cylinder body and the first end of the hydraulic cylinder sleeve.

[0018] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0019] The fastening tool for the impeller overcomes the influence of surface quality and on-site environment on fastening force, controls the fastening force intuitively and accurately, and ensures the reliability of safe operation of high-speed centrifugal fans, especially high-pressure fans.

[0020] The utility model discloses utilize the characteristic of wide hydraulic pressure range, change hydraulic pressure, can obtain different fastening force, suitable for all specifications of fan, especially in large specification fan, when need great fastening force, the superiority of the utility model is more obvious. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the content of the utility model more easily be clearly understood, below according to the specific embodiment of the utility model and combining with the drawings, the utility model is further detailed.

[0022] Figure 1 It is the fastening tool structure schematic diagram of the impeller of the utility model.

[0023] Figure 2 It is the fastening tool structure side view schematic diagram (K direction) of the impeller of the utility model.

[0024] Figure 3 It is the fastening structure schematic diagram of impeller and rotating shaft.

[0025] Figure 4 It is the use schematic diagram of the utility model in the impeller fastening tool.

[0026] Description of the Drawings:

[0027] 1, rotating shaft;2, compression screw;3, impeller;4, washer;5, fastening nut;6, thrust cylinder;6a, second hole section one;6b, second hole section two;61, notch;62, second axial thrust face;7, hydraulic cylinder sleeve;7a, first hole section one;7b, first hole section two;71, oil injection hole;8, first sealing element;9, second sealing element;10, pull mother;101, first axial thrust face;102, boss;11, hydraulic cylinder core;11a, first shaft section;11b, second shaft section;111, limit step;12, pressure cavity. DETAILED DESCRIPTION

[0028] The utility model is further explained in connection with the drawings and specific embodiment, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0029] In the utility model, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the utility model, and is not instructing or suggesting that the indicated technical feature must have a particular orientation, a particular orientation structure and operation, so it can not be understood as the limitation of the utility model.

[0030] In the utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceed" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the utility model, if "first" and "second" are described, they are only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0031] In the utility model, unless otherwise explicitly limited, the words such as "arrangement", "installation", "connection" and the like should be understood in a broad sense, for example, can be directly connected, can also be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected, can also be integrally formed; can be mechanically connected, can also be electrically connected or capable of intercommunication; can be the communication or interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0032] Referring to Figure 1 , Figure 3 As shown in the utility model discloses a fastener fro impeller 3, the axial side of impeller 3 is provided with rotating shaft 1, and the first end of compression screw rod 2 passes through the center through hole of impeller 3 and is connected with rotating shaft 1, the second end of compression screw rod 2 extends to the axial other side of impeller 3 and is provided with washer 4 and fastening nut 5 on it, and the fastener fro impeller 3 comprises:

[0033] Pull mother 10 is used for being connected with the second end of compression screw rod 2 through thread, and the end of pull mother 10 axially away from compression screw rod 2 extends radially outwardly and has boss 102;

[0034] Hydraulic cylinder core 11 is sleeved on the outside of pull mother 10 and comprises first shaft section 11a and second shaft section 11b in connection, the diameter of first shaft section 11a is less than the diameter of second shaft section 11b, and second shaft section 11b abuts against boss 102 and extends radially outwardly and has limit step 111;

[0035] Hydraulic cylinder sleeve 7 comprises first end and second end axially opposite and is provided with first step hole, and the first step hole comprises first hole section one 7a matched with first shaft section 11a and first hole section two 7b matched with second shaft section 11b, the pressure cavity 12 for passing into pressure oil is formed between second shaft section 11b and the bottom wall of first hole section two 7b, and the second end of hydraulic cylinder sleeve 7 abuts against limit step 111;

[0036] The thrust cylinder 6 is provided with a second stepped hole comprising a second hole section one 6a and a second hole section two 6b with different diameters, the second hole section one 6a can be sleeved outside the fastening nut 5, and the first shaft section 11a extends into the second hole section two 6b; the thrust cylinder 6 comprises a first end and a second end arranged in an axial direction, the first end of the thrust cylinder 6 can abut against the gasket 4, and the second end of the thrust cylinder 6 abuts against the first end of the hydraulic cylinder sleeve 7.

[0037] By adopting a hydraulic control mode, the axial thrust generated by the pressure oil is used for fastening, the interference of the friction coefficient fluctuation on the fastening force accuracy is effectively avoided, and the reliability of the impeller 3 fastening is significantly improved.

[0038] Referring to Figure 1 , in an embodiment, a radial outer end of the hydraulic cylinder sleeve 7 is provided with an oil injection hole 71 connected to the pressure cavity 12.

[0039] The oil injection hole 71 is a threaded hole and is connected to an outlet of a hydraulic pump, and the outlet of the hydraulic pump is provided with a pressure gauge to obtain the oil pressure value (P) in the pressure cavity 12. It should be noted that the pressure gauge can be directly installed at the outlet of the hydraulic pump, or can be introduced to a position visible to the human eye through a pipeline.

[0040] In an embodiment, referring to Figure 2 , an end surface of the thrust cylinder 6 is provided with a notch 61 penetrating into the second hole section one 6a, which can be provided with 1-2 notches to expose the fastening nut 5, so as to facilitate rotating the fastening nut 5 through the notch 61.

[0041] In an embodiment, the central through hole of the hydraulic cylinder core 11 is in clearance fit with the puller 10.

[0042] In an embodiment, the first shaft section 11a is in clearance fit with the first hole section one 7a; the second shaft section 11b is in clearance fit with the first hole section two 7b, one of which is in small clearance fit and the other is in larger clearance fit to prevent mutual interference.

[0043] In an embodiment, the first shaft section 11a is in clearance fit with the second hole section two 6b.

[0044] In an embodiment, a first sealing member 8 is arranged between the first shaft section 11a and the first hole section one 7a; and a second sealing member 9 is arranged between the second shaft section 11b and the first hole section two 7b.

[0045] In one embodiment, under the action of the pressure oil in the pressure cavity 12, the second shaft section 11b and the boss 102 form a first axial thrust surface 101, and the second end of the thrust cylinder body 6 and the first end of the hydraulic cylinder sleeve 7 form a second axial thrust surface 62.

[0046] It should be noted that, as shown in Figure 1 , Figure 4 When the oil pressure in the pressure cavity 12 is P, under the action of the first axial thrust surface 101, the hydraulic cylinder core 11 exerts an axial thrust F (direction to the right) on the puller 10, and under the action of the second axial thrust surface 62, the cylinder sleeve also exerts an axial thrust F (direction to the left) on the thrust cylinder, at this time, the gasket 4 is also subjected to a thrust F (to the left) from the thrust cylinder body 6, that is, the axial force on the impeller 3 is also F.

[0047] As shown in Figure 4 Before the impeller 3 is fastened, the fastening threads on the compression screw 2 have not been fastened. The central threads on the puller 10 are coupled with the threads on the compression screw 2, so that the first end (left end surface) of the thrust cylinder abuts against the gasket 4; the oil injection hole 71 on the hydraulic cylinder sleeve 7 is connected with the outlet of the manual hydraulic pump, the manual hydraulic pump is operated to make the pressure gauge installed at the outlet reach the design value P, at this time, the oil pressure in the pressure cavity 12 is equal to P, under the action of the pressure oil, the hydraulic cylinder core 11 and the puller 10 form a first axial thrust surface 101, the hydraulic cylinder core 11 exerts an axial thrust F (direction to the right) on the puller 10, at the same time, the cylinder sleeve and the thrust cylinder body 6 form a second axial thrust surface 62, the hydraulic cylinder sleeve 7 also exerts an axial thrust F (direction to the left) on the thrust cylinder, at this time, the gasket 4 is also subjected to a thrust F (to the left) from the thrust cylinder body 6, that is, the axial force on the impeller 3 is also F, due to the action of the axial force F, the impeller 3 and the gasket 4 are compressed, the compression screw 2 is elongated, the fastening nut 5 is separated from the gasket 4, after the hydraulic pressure P is stabilized, the axial force F does not change, the relative axial displacement due to compression and elongation also stabilizes, at this time, the fastening nut 5 is rotated through the gap 61 on the thrust cylinder body 6 to abut against the gasket 4, then the hydraulic pump is operated to be decompressed, the puller 10 and the entire fastening tool are removed, the fastening force F of the impeller 3 is entirely borne by the fastening nut 5 and the compression screw 2, that is, the entire fastening work of the impeller 3 is completed. By adopting the hydraulic control mode, the axial thrust generated by the pressure oil is used for fastening, the interference of the fluctuation of the friction coefficient on the fastening force precision is effectively avoided, and the reliability of the fastening effect is significantly improved.

[0048] It should be noted that, when the diameter of the first hole section one 7a of the hydraulic cylinder sleeve 7 is d, the diameter of the first hole section two 7b is D (D>d), and the oil pressure in the pressure cavity 12 is equal to P, F is the design fastening force of the impeller 3, then Since the P can be accurately controlled and read by the pressure gauge, a relatively accurate impeller 3 fastening force F can be obtained.

[0049] Finally, it should be noted that the above specific embodiments are merely used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A fastening tool for an impeller (3) provided with a rotating shaft (1) on one axial side, a first end of a compression screw (2) passing through a central through-hole of the impeller (3) and being connected to the rotating shaft (1), a second end of the compression screw (2) extending to the other axial side of the impeller (3) and being provided with a washer (4) and a fastening nut (5) thereon, characterized in that, The fastening tool comprises: a puller (10) connected to the second end of the compression screw (2); the puller (10) extends radially outward at one end away from the compression screw (2) and has a boss (102); a hydraulic cylinder core (11) sleeved outside the puller (10) and comprising a first shaft segment (11a) and a second shaft segment (11b) in connection; the diameter of the first shaft segment (11a) is smaller than that of the second shaft segment (11b), the second shaft segment (11b) abuts against the boss (102) and extends radially outward by a limiting step (111); a hydraulic cylinder sleeve (7) comprising a first end and a second end arranged axially opposite to each other and provided with a first stepped hole; the first stepped hole comprises a first hole segment one (7a) matched with the first shaft segment (11a) and a first hole segment two (7b) matched with the second shaft segment (11b), a pressure cavity (12) for passing in pressure oil is formed between the second shaft segment (11b) and the bottom wall of the first hole segment two (7b), and the second end of the hydraulic cylinder sleeve (7) abuts against the limiting step (111); a thrust cylinder body (6) provided with a second stepped hole comprising a second hole segment one (6a) and a second hole segment two (6b) with different diameters, the second hole segment one (6a) can be sleeved outside the fastening nut (5), and the first shaft segment (11a) extends into the second hole segment two (6b); the thrust cylinder body (6) comprises a first end and a second end arranged axially opposite to each other, the first end of the thrust cylinder body (6) can abut against the gasket (4), and the second end of the thrust cylinder body (6) abuts against the first end of the hydraulic cylinder sleeve (7).

2. A fastening tool for an impeller (3) according to claim 1, characterized in that The radial outer end of the hydraulic cylinder sleeve (7) is provided with an oil injection hole (71) in communication with the pressure cavity (12).

3. A fastening tool for an impeller (3) according to claim 2, characterized in that The oil injection hole (71) is a threaded hole and is connected to the outlet of a hydraulic pump.

4. A fastening tool for an impeller (3) according to claim 3, characterized in that The outlet of the hydraulic pump is provided with a pressure gauge to obtain the oil pressure value in the pressure cavity (12).

5. A fastening tool for an impeller (3) according to claim 1, characterized in that The end face of the thrust cylinder body (6) is provided with a notch (61) penetrating into the second hole segment one (6a) to expose the fastening nut (5).

6. A fastening tool for an impeller (3) according to claim 1, characterized in that The central through hole of the hydraulic cylinder core (11) is in clearance fit with the puller (10).

7. A fastening tool for impellers (3) according to claim 1, characterized in that The first shaft segment (11a) is in clearance fit with the first hole segment one (7a), and the second shaft segment (11b) is in clearance fit with the first hole segment two (7b).

8. A fastening tool for impellers (3) according to claim 1, characterized in that The first shaft segment (11a) is in clearance fit with the second hole segment two (6b).

9. A fastening tool for impellers (3) according to claim 1, characterized in that A first sealing member (8) is arranged between the first shaft segment (11a) and the first hole segment one (7a), and a second sealing member (9) is arranged between the second shaft segment (11b) and the first hole segment two (7b).

10. A fastening tool for impellers (3) according to any one of claims 1-9, characterized in that Under the action of pressure oil in the pressure cavity (12), a first axial thrust surface (101) is formed between the second shaft segment (11b) and the boss (102), and a second axial thrust surface (62) is formed between the second end of the thrust cylinder body (6) and the first end of the hydraulic cylinder sleeve (7).

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