CN219734964U - Sealing structure for grease gun - Google Patents

Abstract

The utility model discloses a sealing structure for a grease gun, which comprises a grease outlet pipe and an extension pipe, wherein a first connecting hole is formed in the grease outlet pipe, an elastic sealing piece is arranged in the first connecting hole, a communication hole which enables the extension pipe to be communicated with the inside of the grease outlet pipe is formed in the elastic sealing piece, the diameter of a first opening of one side of the communication hole, which faces the grease outlet pipe, is larger than that of a second opening of one side of the communication hole, which faces the extension pipe, is in transition with the second opening through a transition surface, so that the elastic sealing piece expands outwards under the action of high-pressure grease and compresses the inner wall of the first connecting hole, and the elastic sealing piece abuts against the end part of the extension pipe under the action of the high-pressure grease. The utility model provides a sealing structure for a grease gun, which can increase the sealing effect of the connecting part of parts, can realize the quick disassembly and assembly of extension pipes and is convenient for workers to replace different extension pipes according to different working conditions.

Description

Sealing structure for grease gun

Technical Field

The utility model relates to the technical field of electric grease guns, in particular to a sealing structure for a grease gun.

Background

A grease gun is a tool for filling mechanical equipment with grease. The positions where all parts of the existing grease gun are connected are generally sealed through conical threads, when all parts are connected, in order to ensure the sealing effect, the parts are required to be screwed up by means of a wrench, connection and disassembly are relatively laborious, and due to the fact that the pressure in the grease gun is relatively large, a large number of oil leakage situations still occur even under the screwing up condition.

Disclosure of Invention

The utility model provides the sealing structure for the grease gun, which aims to solve the problems that the sealing performance of the connection part of each part of the grease gun is insufficient and the disassembly and assembly of each part are hard in the prior art, can increase the sealing effect of the connection part of the part, can realize the quick disassembly and assembly of the extension tube, and is convenient for workers to replace different extension tubes according to different working conditions.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a seal structure for grease gun, includes play oil pipe and extension pipe, be equipped with first connecting hole on the play oil pipe, the one end and the first connecting hole threaded connection of extension pipe, be equipped with elastic sealing element in the first connecting hole, be equipped with the intercommunicating pore that makes extension pipe and play inside intercommunication of oil pipe on the elastic sealing element, be equipped with the high-pressure butter from play oil pipe flow direction extension pipe in the intercommunicating pore, the intercommunicating pore is greater than the diameter towards the second open-ended of extension pipe one side towards the first open-ended diameter of play oil pipe one side, passes through the transition face transition between first opening and the second open-ended to make elastic sealing element outwards expand and compress tightly the inner wall of first connecting hole under the effect of high-pressure butter, and make elastic sealing element support the tip of tight extension pipe under the effect of high-pressure butter.

In the above technical scheme, the extension tube can be a hard alloy tube or a flexible tube which can be bent at a certain angle, so that the extension tube can be conveniently extended into each position. The outer side wall of the extension tube is provided with a holding structure which is convenient for screwing the extension tube and the oil outlet tube. The screw thread between one end of extension pipe and the first connecting hole can adopt ordinary screw thread, can be with oil outlet pipe and extension pipe connection can. When the oil outlet pipe and the extension pipe pass through high-pressure butter, the high-pressure butter flows through the communication hole and expands the elastic sealing element outwards, so that the outer side wall of the elastic sealing element is abutted against the inner wall of the first connecting hole to form a first seal. The first seal and the second seal can prevent high-pressure grease from leaking out through a gap between the oil outlet pipe and the extension pipe. Even when the oil outlet pipe and the extension pipe are connected, the oil outlet pipe is not completely screwed up, the end part of the elastic sealing piece is not contacted with the bottom surface of the first connecting hole, the sealing effect of the first sealing and the second sealing is not affected, the pressure of the high-pressure grease is larger, the pressure generated by the first sealing and the second sealing is larger, the sealing effect is better, the pressure of the high-pressure grease is increased, the sealing effect of the elastic sealing piece is not weakened, and the sealing structure can be suitable for high-pressure working conditions. Because the elastic sealing element is not required to be axially compressed through the oil outlet pipe and the extension pipe to generate a sealing effect, when the extension pipe is screwed up, tools are not required, and only the extension pipe and the oil outlet pipe are directly held by two hands to be screwed up, so that the extension pipe can be quickly disassembled and assembled, and workers can conveniently replace different extension pipes according to different working conditions.

Preferably, the elastic sealing element comprises a first expansion part matched with the first connecting hole and a second expansion part matched with the inner hole of the extension pipe, the outer side surface of the first expansion part is a first sealing surface, the outer side surface of the second expansion part is a second sealing surface, the connecting surface between the first sealing surface and the second sealing surface is a third sealing surface, and the third sealing surface is tightly attached to the end part of the extension pipe.

In the above technical scheme, the first expansion part and the second expansion part form a T-shaped elastic sealing element, high-pressure grease flows through the communication hole, the first expansion part and the second expansion part are outwards expanded, and the outer side wall of the expanded first expansion part abuts against the inner wall of the first connecting hole to realize first sealing; the third sealing surface is tightly attached to the end part of the extension tube, and the high-pressure grease can generate a thrust force from the first opening to the second opening on the elastic sealing element, so that the third sealing surface is abutted against the end part of the extension tube to form a second seal; the outer side wall of the second expansion part after being expanded abuts against the inner wall of the extension pipe to realize third sealing, and the sealing effect of the elastic sealing element can be further improved by the third sealing.

Preferably, the third sealing surface is a step surface; alternatively, the third sealing surface is a conical surface. In the above technical scheme, when the third sealing surface is a step surface, a bending structure can be formed between the second sealing surface and the third sealing surface, so that the sealing area is increased, and the sealing effect can be increased.

Preferably, the second expansion part is in interference fit with the inner hole of the extension tube, and the first expansion part is in clearance fit with the first connecting hole; alternatively, the second expansion part is in clearance fit with the inner hole of the extension tube, and the first expansion part is in interference fit with the first connecting hole.

In the first technical scheme, the second expansion part is in interference fit with the inner hole of the extension pipe, the elastic sealing element can be taken out of the first connecting hole when the extension pipe is disassembled, the damage degree of the elastic sealing element is conveniently observed, and the elastic sealing element is convenient to replace. In the second technical scheme, the first expansion part is in interference fit with the first connecting hole. The elastic sealing element can be left at the first connecting hole when the extension tube is detached, so that the problem that the elastic sealing element is easily dropped and lost when being taken out of the first connecting hole is avoided, dirt such as dust and the like can be reduced and stuck on the elastic sealing element, and the sealing effect is ensured.

Preferably, a first ring groove is arranged on the first sealing surface; and/or a second annular groove is arranged on the second sealing surface.

In the first technical scheme, the first annular groove can divide the first sealing surface into two relatively independent sealing surfaces, so that the mutual influence is reduced, even if one of the sealing surfaces fails, the other sealing surface cannot be influenced, the first expansion part can deform towards the first annular groove when being pressed and expanded, and the influence of deformation folds on the sealing effect is reduced. In the second technical scheme, the second annular groove can divide the second sealing surface into two relatively independent sealing surfaces, so that the mutual influence is reduced, even if one of the sealing surfaces fails, the other sealing surface cannot be influenced, the second expansion part can deform towards the second annular groove when being pressed and expanded, and the influence of deformation folds on the sealing effect is reduced.

Preferably, the end of the extension pipe clamps the elastic sealing member with the bottom surface of the first connection hole, so that the end of the elastic sealing member contacts with the bottom surface of the first connection hole to form a fourth sealing surface. The scheme can further increase the sealing effect between the elastic sealing element and the first connecting hole, and can play a locking role in connection between the oil outlet pipe and the extension pipe through the elasticity of the elastic sealing element.

Preferably, a transition surface between the first opening and the second opening is a conical surface; or, the transition surface between the first opening and the second opening is a step surface. In the above scheme, the component force of the high-pressure grease on the conical surface in the axial direction can compress the elastic sealing element on the end part of the extension pipe, and the component force of the high-pressure grease on the conical surface in the radial direction can expand the elastic sealing element outwards and compress the elastic sealing element on the inner wall of the first connecting hole. The elastic sealing element can be pressed on the end part of the extension pipe by the force of the high-pressure grease on the step surface in the axial direction, and the elastic sealing element can be expanded outwards and pressed on the inner wall of the first connecting hole by the force of the high-pressure grease on the communication hole in the radial direction.

Preferably, the extension tube is provided with a counter bore adapted to the second expansion portion.

The utility model provides a seal structure for grease gun, includes extension pipe and play glib, be equipped with the second connecting hole on the glib, the one end and the second connecting hole threaded connection of extension pipe, be equipped with the second sealing member in the second connecting hole, the second sealing member includes the third expansion part of second connecting hole adaptation and the fourth expansion part with extension pipe hole adaptation, be equipped with the bell mouth that makes extension pipe and the inside intercommunication of oil outlet pipe on the second sealing member, be equipped with the high-pressure butter that flows to the glib from the extension pipe in the bell mouth, the big one end of bell mouth diameter is towards the extension pipe to make the second sealing member outwards expand and compress tightly the inner wall of second connecting hole and the inner wall of extension pipe under the effect of high-pressure butter, and make the second sealing member support the bottom surface of tight second connecting hole under the effect of high-pressure butter.

In the above technical scheme, the thread between one end of the extension pipe and the second connecting hole can be a common thread, and the oil outlet nozzle can be connected with the extension pipe. When the high-pressure grease passes through the inside of the grease nipple and the extension tube, the high-pressure grease can flow through the conical hole, and due to the existence of the conical hole, the second sealing piece expands outwards under the action of the high-pressure grease and compresses the inner wall of the second connecting hole and the inner wall of the extension tube, so that a first seal and a second seal are formed, and the second sealing piece abuts against the bottom surface of the second connecting hole under the action of the high-pressure grease, so that a third seal is formed. Even the oil outlet pipe is not screwed up completely with the extension pipe, the tip of second sealing member does not contact with the bottom surface of second connecting hole, also can not influence the sealed effect of three seals, and the pressure to the sealed pressure that produces of three seals is bigger the pressure of high-pressure butter, and the sealed effect is better the more, therefore the pressure of high-pressure butter increases, can not lead to sealed effect to weaken, and above-mentioned seal structure can be applicable to the high-pressure operating mode. Because the second sealing piece is not required to be axially compressed through the oil outlet nozzle and the extension pipe, tools are not required during screwing, and only the extension pipe and the oil outlet nozzle are required to be directly held by two hands for screwing, so that the extension pipe and the oil outlet nozzle can be quickly disassembled and assembled.

Preferably, the end of the extension pipe and the bottom surface of the second connecting hole clamp the second sealing member, so that the end of the second sealing member contacts with the bottom surface of the second connecting hole to form a fifth sealing surface. The scheme can further increase the sealing effect between the second sealing piece and the second connecting hole, and can play a locking role in connection between the oil outlet nozzle and the extension pipe through the elasticity of the second sealing piece.

The utility model provides a seal structure for grease gun, includes oil outlet pipe and extension pipe, be equipped with first connecting hole on the oil outlet pipe, the one end and the first connecting hole threaded connection of extension pipe, the extension pipe sets up and is equipped with sealed annular on the lateral wall of the one end in first connecting hole, be equipped with the sealing washer on the sealed annular, the lateral wall of sealing washer supports the inside wall of tight first connecting hole.

In the above technical scheme, the thread between one end of the extension pipe and the second connecting hole can be a common thread, and the oil outlet nozzle can be connected with the extension pipe. The inner side wall of the first connecting hole, which is in contact with the sealing ring, is a smooth side wall, i.e. no internal thread is arranged. The sealing ring can seal the gap between the oil outlet pipe and the extension pipe, and even if the oil outlet pipe and the extension pipe are connected without being completely screwed, the sealing can be realized. Therefore, when the extension tube is screwed, a tool is not needed, and only the extension tube and the oil outlet nozzle are directly held by two hands for screwing, so that the extension tube and the oil outlet nozzle can be quickly disassembled and assembled.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a partial cross-sectional view of the present utility model;

FIG. 5 is a partial enlarged view at B in FIG. 2;

fig. 6 is a schematic partial structure of embodiment 3.

In the figure: the oil outlet pipe 1, the extension pipe 2, the sealing ring groove 2.1, the first connecting hole 3, the circular arc surface 3.1, the elastic sealing piece 4, the first expansion part 4.1, the second expansion part 4.2, the communication hole 5, the first opening 5.1, the second opening 5.2, the transition surface 5.3, the first sealing surface 6, the second sealing surface 7, the third sealing surface 8, the first ring groove 11, the second ring groove 12, the fourth sealing surface 13, the counter bore 14, the oil outlet nozzle 15, the second connecting hole 16, the second sealing piece 17, the third expansion part 17.1, the fourth expansion part 17.2, the conical hole 18, the fifth sealing surface 19 and the sealing ring 20.

Detailed Description

The utility model is further described below with reference to the drawings and specific embodiments.

The utility model provides an electronic grease gun, includes the oil storage bucket, sets up the end cover on the oil storage bucket, set up on the end cover and with the play oil pipe of oil storage bucket intercommunication, with play oil pipe connection and the extension pipe of intercommunication, with the play glib talker of extension pipe connection and intercommunication, and the actuating mechanism who is connected with the oil storage bucket, actuating mechanism makes and produces high pressure in the oil storage bucket, extrudes the butter in the oil storage bucket to make the butter spray the position of waiting to lubricate through play oil pipe, extension pipe and play glib talker in proper order.

Example 1:

as shown in fig. 1, fig. 2 and fig. 3, a sealing structure for a grease gun comprises a grease outlet pipe 1 and an extension pipe 2, wherein a first connecting hole 3 is formed in the grease outlet pipe 1, one end of the extension pipe 2 is in threaded connection with the first connecting hole 3, an elastic sealing element 4 is arranged in the first connecting hole 3, a communication hole 5 which enables the extension pipe 2 to be communicated with the inside of the grease outlet pipe 1 is formed in the elastic sealing element 4, high-pressure grease which flows from the grease outlet pipe 1 to the extension pipe 2 is arranged in the communication hole 5, the diameter of a first opening 5.1 of the communication hole 5 towards one side of the grease outlet pipe 1 is larger than the diameter of a second opening 5.2 towards one side of the extension pipe 2, transition surfaces 5.3 are formed between the first opening 5.1 and the second opening 5.2, so that the elastic sealing element 4 expands outwards under the action of the high-pressure grease and compresses the inner wall of the first connecting hole 3, and the elastic sealing element 4 abuts against the end of the extension pipe 2 under the action of the high-pressure grease.

In the above technical scheme, the extension tube 2 may be a hard alloy tube, or may be a flexible tube that may be bent at a certain angle, so as to facilitate extending the extension tube 2 into each position. The outer side wall of the extension pipe 2 is provided with a holding structure which is convenient for screwing the extension pipe 2 and the oil outlet pipe 1. The screw thread between one end of the extension pipe 2 and the first connecting hole 3 can be a common screw thread, and the oil outlet pipe 1 can be connected with the extension pipe 2. When the oil outlet pipe 1 and the extension pipe 2 pass through high-pressure grease, the high-pressure grease flows through the communication hole 5 and expands the elastic sealing element 4 outwards, so that the outer side wall of the elastic sealing element 4 abuts against the inner wall of the first connecting hole 3 to form a first seal, and the high-pressure grease can generate a thrust from the first opening 5.1 to the second opening 5.2 on the elastic sealing element 4 because the diameter of the first opening 5.1 is larger than that of the second opening 5.2, so that the elastic sealing element 4 abuts against the end part of the extension pipe 2 to form a second seal. The first seal and the second seal can prevent high-pressure grease from leaking out through the gap between the oil outlet pipe 1 and the extension pipe 2. Even when the oil outlet pipe 1 and the extension pipe 2 are connected, the end part of the elastic sealing element 4 is not in contact with the bottom surface of the first connecting hole 3, the sealing effect of the first seal and the second seal is not affected, the higher the pressure of the high-pressure grease is, the higher the pressure generated by the first seal and the second seal is, the better the sealing effect is, so that the pressure of the high-pressure grease is increased, the sealing effect of the elastic sealing element 4 is not weakened, and the sealing structure can be suitable for high-pressure working conditions. Because the elastic sealing piece 4 is not required to be axially compressed through the oil outlet pipe 1 and the extension pipe 2 to generate a sealing effect, when the extension pipe 2 is screwed up, tools are not required, and only the extension pipe 2 and the oil outlet pipe 1 are directly held by two hands to be screwed up, so that the extension pipe 2 can be quickly disassembled and assembled, and workers can conveniently replace different extension pipes 2 according to different working conditions.

In this embodiment, as shown in fig. 3, a flat arc surface 3.1 is disposed at a position of the first connecting hole 3 near the bottom surface, no internal thread is disposed on the arc surface 3.1, and an outer side wall of the elastic sealing member 4 at least partially abuts against the arc surface 3.1. The flat circular arc surface 3.1 can increase the sealing effect between the outer side wall of the elastic sealing element 4 and the first connecting hole 3.

In this embodiment, as shown in fig. 3, the elastic sealing member 4 includes a first expansion portion 4.1 adapted to the first connection hole 3 and a second expansion portion 4.2 adapted to the inner hole of the extension pipe 2, the outer side surface of the first expansion portion 4.1 is a first sealing surface 6, the outer side surface of the second expansion portion 4.2 is a second sealing surface 7, a connection surface between the first sealing surface 6 and the second sealing surface 7 is a third sealing surface 8, and the third sealing surface 8 is tightly attached to the end portion of the extension pipe 2.

In the above technical solution, the first expansion portion 4.1 and the second expansion portion 4.2 form a T-shaped elastic sealing member 4, high-pressure butter flows through the communication hole 5, and expands the first expansion portion 4.1 and the second expansion portion 4.2 outwards, and the outer side wall of the expanded first expansion portion 4.1 abuts against the inner wall of the first connecting hole 3 to realize a first seal; the third sealing surface 8 is tightly attached to the end part of the extension tube 2, and high-pressure grease can generate a thrust force from the first opening 5.1 to the second opening 5.2 on the elastic sealing element 4, so that the third sealing surface 8 is abutted against the end part of the extension tube 2 to form a second seal; the outer side wall of the second expansion part 4.2 after being expanded abuts against the inner wall of the extension pipe 2, so that third sealing is realized, and the sealing effect of the elastic sealing element 4 can be further improved by the third sealing.

In this embodiment, as shown in fig. 4, the first sealing surface 6 is provided with a first ring groove 11; the second sealing surface 7 is provided with a second ring groove 12. In the above technical scheme, the first annular groove 11 can divide the first sealing surface 6 into two relatively independent sealing surfaces, so that the mutual influence is reduced, even if one of the sealing surfaces fails, the other sealing surface cannot be influenced, the first expansion part 4.1 can deform towards the first annular groove 11 during compression expansion, and the influence of deformation folds on the sealing effect is reduced. The second annular groove 12 can divide the second sealing surface 7 into two relatively independent sealing surfaces, so that the mutual influence is reduced, even if one of the sealing surfaces fails, the other sealing surface cannot be influenced, the second expansion part 4.2 can deform towards the second annular groove 12 when being compressed and expanded, and the influence of deformation folds on the sealing effect is reduced.

Preferably, as shown in fig. 3, the end of the extension pipe 2 clamps the elastic sealing member 4 with the bottom surface of the first connection hole 3 so that the end of the elastic sealing member 4 contacts with the bottom surface of the first connection hole 3 to form the fourth sealing surface 13. The scheme can further increase the sealing effect between the elastic sealing element 4 and the first connecting hole, and can play a locking role in the connection between the oil outlet pipe 1 and the extension pipe 2 through the elasticity of the elastic sealing element 4.

Preferably, as shown in fig. 3, the extension pipe 2 is provided with a counter bore 14 adapted to the second expansion part 4.2.

In one embodiment, as shown in fig. 3, the third sealing surface 8 is a stepped surface. When the third sealing surface 8 is a step surface, a bending structure can be formed between the second sealing surface 7 and the third sealing surface 8, so that the sealing area is increased, and the sealing effect can be increased.

It will be appreciated that in another embodiment, as shown in fig. 4, the third sealing surface 8 is a conical surface.

In one embodiment, the second expansion portion 4.2 is in interference fit with the inner bore of the extension tube 2, and the first expansion portion 4.1 is in clearance fit with the first connection hole 3. The second expansion part 4.2 is in interference fit with the inner hole of the extension tube 2, the elastic sealing element 4 can be taken out of the first connecting hole 3 when the extension tube 2 is disassembled, the damage degree of the elastic sealing element 4 is conveniently observed, and the elastic sealing element 4 is conveniently replaced.

It will be appreciated that in another embodiment, the second expansion portion 4.2 is in clearance fit with the inner bore of the extension tube 2, and the first expansion portion 4.1 is in interference fit with the first connection bore 3. The first expansion part 4.1 is in interference fit with the first connecting hole 3. The elastic sealing element 4 can be left at the first connecting hole 3 when the extension tube 2 is disassembled, so that the problem that the elastic sealing element 4 is easily dropped and lost when being taken out of the first connecting hole 3 is avoided, dirt such as dust and the like can be reduced and stuck on the elastic sealing element 4, and the sealing effect is ensured.

In one embodiment, as shown in fig. 3, the transition surface 5.3 between the first opening 5.1 and the second opening 5.2 is a conical surface. In the above scheme, the component force of the high-pressure grease on the conical surface in the axial direction can compress the elastic sealing element 4 on the end part of the extension pipe 2, and the component force of the high-pressure grease on the conical surface in the radial direction can expand the elastic sealing element 4 outwards and compress the elastic sealing element 4 on the inner wall of the first connecting hole 3.

It will be appreciated that in another embodiment, as shown in fig. 4, the transition surface 5.3 between the first opening 5.1 and the second opening 5.2 is a stepped surface. In the above scheme, the elastic sealing element 4 can be pressed on the end part of the extension pipe 2 by the force of the high-pressure grease on the step surface in the axial direction, and the elastic sealing element 4 can be expanded outwards and pressed on the inner wall of the first connecting hole 3 by the force of the high-pressure grease on the communication hole 5 in the radial direction.

It will be appreciated that the sealing arrangement in this embodiment may also be adapted for use with a manual grease gun.

Example 2:

as shown in fig. 5, a sealing structure for a grease gun comprises an extension pipe 2 and a grease nipple 15, wherein a second connecting hole 16 is formed in the grease nipple 15, one end of the extension pipe 2 is in threaded connection with the second connecting hole 16, a second sealing piece 17 is arranged in the second connecting hole 16, the second sealing piece 17 comprises a third expansion part 17.1 matched with the second connecting hole 16 and a fourth expansion part 17.2 matched with an inner hole of the extension pipe 2, a conical hole 18 for enabling the extension pipe 2 to be communicated with the inside of the grease nipple 1 is formed in the second sealing piece 17, high-pressure grease flowing from the extension pipe 2 to the grease nipple 15 is arranged in the conical hole 18, one end with a large diameter faces the extension pipe 2, so that the second sealing piece 17 is outwards expanded under the action of the high-pressure grease and compresses the inner wall of the second connecting hole 16 and the inner wall of the extension pipe 2, and the second sealing piece 17 is abutted against the bottom surface of the second connecting hole 16 under the action of the high-pressure grease.

In the above technical solution, the thread between one end of the extension pipe 2 and the second connecting hole 16 may be a common thread, and the oil outlet nozzle 15 may be connected with the extension pipe 2. When the high-pressure grease passes through the inside of the grease nipple 15 and the extension pipe 2, the high-pressure grease flows through the conical hole 18, and due to the existence of the conical hole 18, the second sealing piece 17 expands outwards under the action of the high-pressure grease and compresses the inner wall of the second connecting hole 16 and the inner wall of the extension pipe 2 to form a first seal and a second seal, and the second sealing piece 17 abuts against the bottom surface of the second connecting hole 16 under the action of the high-pressure grease to form a third seal. Even if the oil outlet pipe 1 and the extension pipe 2 are not completely screwed, the end part of the second sealing member 17 is not in contact with the bottom surface of the second connecting hole 16, the sealing effect of the three seals is not affected, and the greater the pressure of the high-pressure grease is, the greater the pressure generated by the three seals is, the better the sealing effect is, so that the pressure of the high-pressure grease is increased, the sealing effect is not weakened, and the sealing structure can be suitable for the high-pressure working condition. Because the second sealing piece 17 is not required to be axially pressed by the oil outlet nozzle 15 and the extension pipe 2 to generate a sealing effect, tools are not required during screwing, and only the extension pipe 2 and the oil outlet nozzle 15 are required to be directly held by two hands for screwing, so that the extension pipe 2 and the oil outlet nozzle 15 can be quickly disassembled and assembled.

Preferably, the end of the extension pipe 2 and the bottom surface of the second connection hole 16 clamp the second sealing member 17, so that the end of the second sealing member 17 contacts the bottom surface of the second connection hole 16 to form the fifth sealing surface 19. The sealing effect between the second sealing element 17 and the second connecting hole 16 can be further increased, and the connection between the oil nozzle 15 and the extension pipe 2 can be prevented from being loose by the elasticity of the second sealing element 17.

In this embodiment, a flat arc surface is disposed at a position of the second connecting hole 16 near the bottom surface, no internal thread is disposed on the arc surface, and the outer side wall of the second sealing member 17 at least partially abuts against the arc surface. The flat arc surface can increase the sealing effect between the outer side wall of the second sealing member 17 and the second connection hole 16.

Example 3:

as shown in fig. 6, a sealing structure for a grease gun comprises a grease outlet pipe 1 and an extension pipe 2, wherein a first connecting hole 3 is formed in the grease outlet pipe 1, one end of the extension pipe 2 is in threaded connection with the first connecting hole 3, a sealing ring groove 2.1 is formed in the outer side wall of one end of the extension pipe 2, which is arranged in the first connecting hole 3, a sealing ring 20 is arranged on the sealing ring groove 2.1, and the outer side wall of the sealing ring 20 abuts against the inner side wall of the first connecting hole 3.

In the above technical scheme, the thread between one end of the extension pipe and the second connecting hole can be a common thread, and the oil outlet nozzle can be connected with the extension pipe. The inner side wall of the first connecting hole, which is in contact with the sealing ring, is a smooth side wall, i.e. no internal thread is arranged. The sealing ring can seal the gap between the oil outlet pipe and the extension pipe, and even if the oil outlet pipe and the extension pipe are connected without being completely screwed, the sealing can be realized. Therefore, when the extension tube is screwed, a tool is not needed, and only the extension tube and the oil outlet nozzle are directly held by two hands for screwing, so that the extension tube and the oil outlet nozzle can be quickly disassembled and assembled.

Claims (7)

1. The utility model provides a seal structure for grease gun, includes play oil pipe and extension pipe, be equipped with first connecting hole on the play oil pipe, the one end and the first connecting hole threaded connection of extension pipe, characterized by, be equipped with elastic sealing element in the first connecting hole, be equipped with the intercommunicating pore that makes extension pipe and play inside intercommunication of oil pipe on the elastic sealing element, be equipped with the high-pressure butter that flows from play oil pipe towards extension pipe in the intercommunicating pore, the diameter of the first open-ended of intercommunicating pore orientation play oil pipe one side is greater than the diameter towards the second open-ended of extension pipe one side, passes through the transition face transition between first open-ended and the second open-ended to make elastic sealing element outwards expand and compress tightly the inner wall of first connecting hole under the effect of high-pressure butter, and make elastic sealing element support the tip of tight extension pipe under the effect of high-pressure butter.

2. The sealing structure for a grease gun according to claim 1, wherein the elastic sealing member comprises a first expansion part adapted to the first connecting hole and a second expansion part adapted to the inner hole of the extension pipe, the outer side surface of the first expansion part is a first sealing surface, the outer side surface of the second expansion part is a second sealing surface, the connecting surface between the first sealing surface and the second sealing surface is a third sealing surface, and the third sealing surface is tightly attached to the end part of the extension pipe.

3. The sealing structure for a grease gun as recited in claim 2, wherein the third sealing surface is a stepped surface; alternatively, the third sealing surface is a conical surface.

4. A sealing arrangement for a grease gun as claimed in claim 2, wherein the second expansion portion is in interference fit with the extension tube bore and the first expansion portion is in clearance fit with the first connection bore; alternatively, the second expansion part is in clearance fit with the inner hole of the extension tube, and the first expansion part is in interference fit with the first connecting hole.

5. The sealing structure for a grease gun as recited in claim 2, wherein the first sealing surface is provided with a first annular groove; and/or a second annular groove is arranged on the second sealing surface.

6. A sealing structure for a grease gun as claimed in any one of claims 1 to 5, wherein the end of the extension tube clamps the elastic sealing member against the bottom surface of the first connecting hole so that the end of the elastic sealing member contacts the bottom surface of the first connecting hole to form a fourth sealing surface.

7. A sealing arrangement for a grease gun as recited in any one of claims 1 to 5, wherein the transition surface between the first and second openings is a tapered surface; or, the transition surface between the first opening and the second opening is a step surface.