CN220052361U

CN220052361U - Electric tool

Info

Publication number: CN220052361U
Application number: CN202321648228.2U
Authority: CN
Inventors: 高军利
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2023-11-21
Anticipated expiration: 2033-06-27

Abstract

The utility model discloses an electric tool, comprising: a gear box; the output shaft is rotatably arranged on the gear box; the first water conveying pipe penetrates through the output shaft and comprises a first water outlet end; the second water delivery pipe comprises a second water inlet end, a second water outlet end and a bending part connected between the second water inlet end and the second water outlet end; and the sealing piece is in sealing connection with the first water outlet end and the second water inlet end so that the first water outlet end and the second water inlet end are communicated. The electric tool of the embodiment of the utility model can avoid the situation that cooling water flows back into the gear box as far as possible.

Description

Electric tool

Technical Field

The present utility model relates to the field of power tools, and more particularly, to a power tool.

Background

An electric water drill, also called a diamond drilling machine or an engineering drilling machine, belongs to one of electric tools, is used for drilling holes on walls or buildings, is mostly a water-free sealing drilling machine in the market, and generally consists of a reduction gearbox body, an output shaft, a water pipe, a sealing sleeve, a retaining ring and the like, wherein the inlet end of the water pipe is fixed on a gear box through a ball valve assembly, the outlet end of the other end of the water pipe is supported on a sealing pipe, and the water pipe is axially positioned by the retaining ring. The outlet end of the water pipe basically protrudes out of the sealing pipe. Because seal pipe and raceway are contact seal, output shaft and seal pipe will rub with the raceway periphery when rotatory to produce the clearance between raceway and the seal pipe, no water seal rig is when using under the slightly inclined condition, after the cooling water flows out from the raceway, promptly has some cooling water to flow back along the periphery wall of raceway, and the clearance that produces between cooling water will raceway and the seal pipe flows back to in the gear box, thereby makes lubricating oil become the water-oil mixture, makes the gear lose lubrication, damages the inside spare part of gear box.

The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The utility model aims to provide an electric tool, which can avoid the situation that cooling water flows backwards into a gear box as far as possible.

To achieve the above object, the present utility model provides a power tool including:

a gear box;

the output shaft is rotatably arranged on the gear box;

the first water conveying pipe penetrates through the output shaft and comprises a first water outlet end;

the second water delivery pipe comprises a second water inlet end, a second water outlet end and a bending part connected between the second water inlet end and the second water outlet end;

and the sealing piece is in sealing connection with the first water outlet end and the second water inlet end so that the first water outlet end and the second water inlet end are communicated.

In one or more embodiments, the power tool further includes a drill bit mounted on the output shaft, the drill bit having an internal cavity in communication with the drill bit and an opening, the water outlet direction of the second water outlet end being oriented toward the opening of the drill bit, the water outlet direction of the second water outlet end being parallel to the drill bit axis; or the water outlet direction of the second water outlet end is inclined towards the direction away from the axis of the drill bit.

In one or more embodiments, a minimum distance between an outer peripheral wall of the second water outlet end and an inner wall of the drill bit is greater than or equal to 5mm.

In one or more embodiments, the sealing element is an elastic sealing tube, one end of the elastic sealing tube is sleeved outside the first water outlet end, the other end of the elastic sealing tube is sleeved outside the second water inlet end, and the elastic sealing tube is in interference fit with the first water outlet end and the second water inlet end respectively.

In one or more embodiments, the outer peripheral wall of the first water outlet end and/or the second water inlet end is provided with a guide surface so as to facilitate the plugging of the first water outlet end and/or the second water inlet end with the sealing element.

In one or more embodiments, the seal housing is provided with a rigid sleeve.

In one or more embodiments, the seal is threadably coupled to the first water outlet end and the second water inlet end, respectively.

In one or more embodiments, an elastic sealing gasket is clamped between the axial end of the first water outlet end and the axial end of the second water inlet end.

In one or more embodiments, the output shaft has a connection hole extending along an axial direction thereof, the first water pipe is partially penetrated in the connection hole, an outer wall of the first water pipe is separated from an inner wall of the connection hole, a sealing pipe is fixedly installed on the inner wall of the connection hole, and the sealing pipe is sealed and sleeved on the first water pipe.

In one or more embodiments, a retainer ring is mounted on the inner wall of the connection hole; and along the axial direction of the sealing tube, the end part, facing the second water conveying tube, of the sealing tube is propped against the check ring so as to limit the sealing tube in the connecting hole.

Compared with the prior art, according to the electric tool disclosed by the utility model, the first water outlet end and the second water inlet end are connected in a sealing way through the sealing piece, so that the first water outlet end and the second water inlet end are communicated, and then the electric tool is matched with the bending part on the second water pipe, when the electric tool is used in a slightly inclined state, after cooling water flows out of the second water outlet end, namely, part of cooling water flows back along the outer peripheral wall of the second water pipe, but when the back-flowing cooling water flows through the bending part, the cooling water can be gathered on the outer peripheral wall of the bending part and drops into the drill bit, or the cooling water can be directly dropped at the outer peripheral wall of the bending part, namely, the cooling water can not continuously flow back along the outer peripheral wall of the second water pipe, so that the situation that the cooling water flows back into the gearbox is avoided as much as possible.

Drawings

FIG. 1 is a partial cross-sectional view of a power tool according to one embodiment of the present utility model;

fig. 2 is an enlarged view at a in fig. 1.

FIG. 3 is a partial cross-sectional view of a connection between an output shaft and a drill bit according to another embodiment of the present utility model.

The main reference numerals illustrate:

1. a gear box; 11. a ball valve assembly; 2. an output shaft; 21. a connection hole; 211. a step surface; 22. sealing the tube; 23. a retainer ring; 3. a drill bit; 31. an inner cavity; 32. an opening; 4. a first water pipe; 41. a first water outlet end; 42. a first water inlet end; 5. a second water pipe; 51. a second water outlet end; 511. a guide surface; 52. a second water inlet end; 53. a bending part; 531. a bending unit; 6. a seal; 7. a rigid sleeve; 8. and an elastic sealing gasket.

Detailed Description

The following detailed description of embodiments of the utility model is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the utility model is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.

The inventor of the utility model finds that the existing anhydrous sealing drilling machine (namely one of electric water drills) on the market generally consists of a reduction gearbox body, an output shaft, a water pipe, a sealing sleeve, a check ring and the like, one end of the water pipe is fixed on a gear box through a connector and a nut, the other end of the water pipe penetrates through an inner hole of the output shaft and is supported on the sealing sleeve, the sealing sleeve is fixed on the inner hole of the output shaft through a step of the check ring and the inner hole for one hole, and when in drilling, cooling water flows in from the connector of the gear box, and the cooling water flowing out through the water pipe cools a drill bit and eliminates dust.

Because seal pipe and raceway are contact seal, output shaft and seal pipe will rub with the raceway periphery when rotatory to produce the clearance between raceway and the seal pipe, no water seal rig is when using under the slightly inclined condition, after the cooling water flows out from the raceway, promptly has some cooling water to flow back along the periphery wall of raceway, and the clearance that produces between cooling water will raceway and the seal pipe flows back to in the gear box, thereby makes lubricating oil become the water-oil mixture, makes the gear lose lubrication, damages the inside spare part of gear box.

As shown in fig. 1 and 2, the electric tool according to an embodiment of the present utility model includes a gear case 1, an output shaft 2, a drill 3, a first water pipe 4, a second water pipe 5, and a sealing member 6; the output shaft 2 is rotatably arranged on the gear box 1; the first water delivery pipe 4 penetrates through the output shaft 2, and the first water delivery pipe 4 comprises a first water outlet end 41; the second water pipe 5 comprises a second water inlet end 52, a second water outlet end 51 and a bending part 53 connected between the second water inlet end 52 and the second water outlet end 51; the sealing member 6 is sealingly connected to the first water outlet end 41 and the second water inlet end 52 so that the first water outlet end 41 and the second water inlet end 52 communicate.

It will be appreciated that, after the first water outlet end 41 and the second water inlet end 52 are connected and sealed by the sealing member 6, when the electric tool is used in a slightly inclined state, after the cooling water flows out from the second water outlet end 51, that is, part of the cooling water flows back along the peripheral wall of the second water pipe 5, but when the cooling water flows back through the bent portion 53, the cooling water gathers on the peripheral wall of the bent portion 53 and drops into the drill bit 3, or the cooling water directly drops on the peripheral wall of the bent portion 53, that is, the cooling water does not continue to flow back along the peripheral wall of the second water pipe 5, so that the situation that the cooling water flows back into the gear box 1 is avoided as much as possible.

The electric tool of the utility model can be a water drill (also called a diamond drilling machine or an engineering drilling machine), and particularly, the electric tool of the utility model can be a water seal-free drilling machine. The drill bit 3 is fixedly connected with the output shaft 2, and in particular, the drill bit 3 and the output shaft 2 can be in threaded connection.

The first water pipe 4 comprises a first water inlet end 42, the electric tool of an embodiment of the utility model further comprises a ball valve assembly 11 connected with the first water inlet end 42, the first water inlet end 42 is arranged on the gear box 1 through the ball valve assembly 11, and the ball valve assembly 11 plays a role in fixedly arranging the first water pipe 4.

The first water pipe 4, the second water pipe 5 and the sealing element 6 are fixedly connected, namely, when the output shaft 2 of the electric tool rotates, the first water pipe 4, the second water pipe 5 and the sealing element 6 do not rotate along with the rotation of the output shaft 2.

It is understood that the bending portion 53 on the first water pipe 4 may include a plurality of bending units 531, and the bending angle and the extending length of each bending unit 531 may be the same or different. For example, in the embodiment shown in fig. 1, the bending portion 53 includes two bending units 531.

As shown in fig. 1 and 2, in a specific embodiment, the electric tool further includes a drill bit 3 mounted on the output shaft 2, the drill bit 3 has an inner cavity 31 and an opening 32 that are communicated, the water outlet direction of the second water outlet end 51 faces the opening 32 of the drill bit 3, the output shaft 2 has a connection hole 21 extending along an axial direction of the output shaft, the first water pipe 4 is partially penetrating through the connection hole 21, an outer wall of the first water pipe 4 is separated from an inner wall of the connection hole 21, a sealing tube 22 is fixedly mounted on the inner wall of the connection hole 21, and the sealing tube 22 is sealed and sleeved on the first water pipe 4. The sealing tube 22 serves to fix and restrict the first water pipe 4. In operation of the power tool of the present utility model, the seal tube 22 rotates with the output shaft 2.

The water outlet direction of the second water outlet end 51 faces the opening 32 of the drill bit 3, so that the situation that the cooling water flowing out of the second water outlet end 51 is directly sprayed to the direction of the first water pipe 4 and directly flows into the gear box 1 can be avoided as far as possible.

Further, a retainer ring 23 is mounted on the inner wall of the connecting hole 21; along the axial direction of the sealing tube 22, the end of the sealing tube 22 facing the second water pipe 5 abuts against the retainer ring 23 to limit the sealing tube 22 in the connecting hole 21. The collar 23 serves to limit the removal of the sealing tube 22 from the connection hole 21 against the end of the sealing member 6.

Further, the connecting hole 21 may have a step surface 211 perpendicular to the axial direction thereof, and the sealing tube 22 is clamped between the step surface 211 and the retainer ring 23 along the axial direction of the sealing tube 22, so as to limit and fix the sealing tube 22.

In one embodiment, as shown in fig. 1, the water outlet direction of the second water outlet 51 is parallel to the axis of the drill bit 3; or, the water outlet direction of the second water outlet end 51 is inclined toward a direction away from the axis of the drill bit 3. The arrangement can avoid the situation that the cooling water flowing out from the second water outlet end 51 is directly sprayed to the direction of the first water delivery pipe 4 as far as possible, and the cooling water directly flows into the gear box 1. In addition, by the arrangement, the situation that the cooling water flowing out of the second water outlet end 51 is splashed into the gear box 1 can be reduced.

Further, the minimum distance between the outer circumferential wall of the second water outlet end 51 and the inner wall of the drill bit 3 is greater than or equal to 5mm. The arrangement can avoid the contact between the second water outlet end 51 and the inner wall of the drill bit 3 as much as possible in the process of installing the second water outlet end 51. I.e. the minimum distance between the outer circumferential wall of the second water outlet end 51 and the inner wall of the drill bit 3 can be regarded as a safe distance, avoiding direct contact with the second water duct 5 after deformation of the drill bit 3.

In one embodiment, as shown in fig. 1, the sealing member 6 is an elastic sealing tube 22, one end of the elastic sealing tube 22 is sleeved outside the first water outlet end 41, the other end is sleeved outside the second water inlet end 52, and the elastic sealing tube 22 is in interference fit with the first water outlet end 41 and the second water inlet end 52 respectively. Wherein the elastic sealing tube 22 serves as a sealing connection.

Further, the outer circumferential wall of the first water outlet end 41 and/or the second water inlet end 52 is provided with a guiding surface 511 so that the first water outlet end 41 and/or the second water inlet end 52 are inserted into the sealing member 6. The guide surface 511 serves to facilitate insertion of the first water outlet end 41 and/or the second water inlet end 52 into the seal 6. In the embodiment shown in fig. 2, the second water inlet end 52 has a guide surface 511 on its outer peripheral wall

Since the elastic sealing tube 22 itself has a certain toughness and elasticity, the second water pipe 5 may have an excessive shaking amplitude during operation. In one embodiment, the sealing member 6 is sleeved with a rigid sleeve 7, and the rigid sleeve 7 can be regarded as a sleeve with higher rigidity and strength, such as a stainless steel tube and the like; the rigid sleeve 7 serves to minimize the sloshing of the second water duct 5.

In another embodiment, as shown in fig. 3, the sealing member 6 is screwed to the first water outlet end 41 and the second water inlet end 52, respectively. Specifically, the sealing member 6 may be tubular, and the inner wall is provided with an internal thread, and the outer peripheral walls of the first water outlet end 41 and the second water inlet end 52 are respectively provided with external threads matched with the internal thread, so that the sealing member 6 is respectively in threaded connection with the first water outlet end 41 and the second water inlet end 52.

Further, an elastic sealing washer 8 is clamped between the axial end of the first water outlet end 41 and the axial end of the second water inlet end 52. By the arrangement, the position relation of the first water conveying pipe 4 and the second water conveying pipe 5 can be determined, and the elastic sealing gasket 8 plays a role in protecting the first water conveying pipe 4 and the second water conveying pipe 5.

The foregoing descriptions of specific exemplary embodiments of the present utility model are presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the utility model and its practical application to thereby enable one skilled in the art to make and utilize the utility model in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.

Claims

1. A power tool, comprising:

a gear box (1);

an output shaft (2) rotatably mounted on the gear box (1);

the first water conveying pipe (4) is arranged on the output shaft (2) in a penetrating mode, and the first water conveying pipe (4) comprises a first water outlet end (41);

the second water delivery pipe (5) comprises a second water inlet end (52), a second water outlet end (51) and a bending part (53) connected between the second water inlet end (52) and the second water outlet end (51);

and the sealing piece (6) is in sealing connection with the first water outlet end (41) and the second water inlet end (52) so as to enable the first water outlet end (41) and the second water inlet end (52) to be communicated.

2. The power tool according to claim 1, further comprising a drill bit (3) mounted on the output shaft (2), the drill bit (3) having an inner cavity (31) in communication with the opening (32), the water outlet direction of the second water outlet end (51) being oriented towards the opening (32) of the drill bit (3), the water outlet direction of the second water outlet end (51) being parallel to the drill bit (3) axis; or the water outlet direction of the second water outlet end (51) is inclined towards the direction away from the axis of the drill bit (3).

3. The power tool according to claim 2, characterized in that the minimum distance between the outer peripheral wall of the second water outlet end (51) and the inner wall of the drill bit (3) is greater than or equal to 5mm.

4. The electric tool according to claim 1, wherein the sealing member (6) is an elastic sealing tube, one end of the elastic sealing tube is sleeved outside the first water outlet end (41), the other end of the elastic sealing tube is sleeved outside the second water inlet end (52), and the elastic sealing tube is in interference fit with the first water outlet end (41) and the second water inlet end (52) respectively.

5. The electric tool according to claim 4, characterized in that the first water outlet end (41) and/or the second water inlet end (52) have a guiding surface (511) on the peripheral wall thereof for facilitating the plugging of the first water outlet end (41) and/or the second water inlet end (52) with the sealing member (6).

6. A power tool according to claim 4, characterized in that the seal (6) is sheathed with a rigid sleeve (7).

7. The power tool according to claim 1, wherein the seal (6) is screwed with the first water outlet end (41) and the second water inlet end (52), respectively.

8. The electric tool according to claim 7, characterized in that an elastic sealing washer (8) is clamped between the axial end of the first water outlet end (41) and the axial end of the second water inlet end (52).

9. The electric tool according to claim 1, wherein the output shaft (2) has a connecting hole (21) extending along an axial direction thereof, the first water pipe (4) is partially penetrated in the connecting hole (21), an outer wall of the first water pipe (4) is separated from an inner wall of the connecting hole (21), a sealing pipe (22) is fixedly installed on the inner wall of the connecting hole (21), and the sealing pipe (22) is sealed and sleeved on the first water pipe (4).

10. The electric tool according to claim 9, wherein a retainer ring (23) is mounted on an inner wall of the connection hole (21); along the axial direction of the sealing tube (22), the end part of the sealing tube (22) facing the second water conveying tube (5) is propped against the check ring (23) so as to limit the sealing tube (22) in the connecting hole (21).