Double-sealing-ring oil plug of gear pump

Abstract

The utility model discloses a double-sealing-ring oil plug of a gear pump, which comprises an oil plug column capable of being assembled with a pump body, and the pump body is provided with an oil hole for accommodating the oil plug column; the oil plug column is sleeved with the sealing ring, a groove for containing the sealing ring is formed in the outer wall of the oil plug column, the sealing ring comprises a first sealing ring body and a second sealing ring body which are coaxially arranged, the cross section of the first sealing ring body is round, the cross section of the second sealing ring body is oval, and the long axis of the oval is parallel to the axis of the oil plug column. And the depth of the second sealing ring in the oil hole is deeper than that of the first sealing ring in the oil hole. The sealing performance of the double-sealing-ring design is better than that of a single sealing ring, the radial thickness of one sealing ring is smaller than the axial thickness of the sealing ring, so that the radial protruding size of the sealing ring is smaller, the whole oil plug column can enter and exit from an oil hole smoothly, the sealing performance of oil liquid is considered, and meanwhile, the disassembly and assembly resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the field of gear pumps, and particularly to a double-sealing-ring oil plug for a gear pump. Background Art

[0002] The oil plug of a gear pump mainly plays the role of draining and replacing oil. The main function of the oil plug is to drain the old or dirty oil in the gear pump so as to replace the lubricating oil. During the long-term operation of the gear pump, the lubricating oil may deteriorate due to oxidation, pollution or wear. At this time, it is necessary to drain the old oil inside through the oil plug and add new lubricating oil to ensure the normal operation of the gear pump and extend its service life.

[0003] In some cases, the gear pump may generate too high pressure due to overload or failure. At this time, the oil plug can also play a role in pressure release to prevent the gear pump from being damaged due to too high pressure.

[0004] Both the convenience during the disassembly and assembly process of the oil plug and the oil sealing degree need to be considered and improved, which are the technical indicators that have been pursued in this field. Content of the Utility Model

[0005] The problem to be solved by the utility model is to provide a double-sealing-ring oil plug for a gear pump. The design of the double sealing rings has better sealing performance than that of a single sealing ring. The radial thickness of one of the sealing rings is thinner than its axial thickness, so the volume of its radial protrusion is smaller, which is convenient for the entire oil plug column to smoothly enter and exit the oil hole, and reduces the disassembly and assembly resistance while taking into account the oil sealing performance.

[0006] To solve the above problems, the utility model provides a double-sealing-ring oil plug for a gear pump. To achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:

[0007] A double-sealing-ring oil plug for a gear pump includes: an oil plug column capable of being assembled with a pump body, and the pump body has an oil hole for accommodating the oil plug column; a sealing ring sleeved on the oil plug column, and the outer wall of the oil plug column has a groove for accommodating the sealing ring. The sealing ring includes a first sealing ring and a second sealing ring arranged coaxially with each other. The cross-sectional contour of the first sealing ring is circular, and the cross-sectional contour of the second sealing ring is elliptical. The major axis of the ellipse is parallel to the axis of the oil plug column, and the depth of the second sealing ring in the oil hole is deeper than the depth of the first sealing ring in the oil hole.

[0008] The beneficial effects of adopting the above technical solutions are as follows: The oil plug column of the present application can perform basic disassembly and assembly functions, realizing basic oil draining and maintenance functions. In addition, the design of the double seals has better sealing performance than that of a single seal. Secondly, the two seals are not simple existing seals. The front seal is relatively flat, that is, the radial thickness of the second seal is thinner than its axial thickness. Therefore, the volume of the second seal protruding radially is not large, which facilitates the entire oil plug column to enter and exit the oil hole without causing much assembly resistance. On the contrary, the axial dimension of the seal participating in sealing is large, which is a technical detail not possessed by traditional circular cross-section seals. Finally, the pump body and other components can form a gear pump combination as a whole.

[0009] As a further improvement of the present utility model, the inner diameter of the first seal is larger than the inner diameter of the second seal.

[0010] The beneficial effects of adopting the above technical solutions are as follows: The oil plug column is a stepped shaft, and different seals adapt to the local diameter values of the oil plug column.

[0011] As a further improvement of the present utility model, the minor axis of the elliptical cross-section contour of the second seal is smaller than the diameter of the circular cross-section contour of the first seal.

[0012] The beneficial effects of adopting the above technical solutions are as follows: Ensure that the second seal is relatively thin radially.

[0013] As a further improvement of the present utility model, the first seal and the second seal are made of rubber or silica gel, and the oil plug column is an integral metal part.

[0014] The beneficial effects of adopting the above technical solutions are as follows: The seals are made of flexible and elastic materials.

[0015] As a further improvement of the present utility model, the groove includes a first groove and a second groove extending circumferentially. The first groove and the second groove are respectively assembled with the first seal and the second seal; there are two internal corners on the inner wall of the second groove, and there is one internal corner on the inner wall of the first groove.

[0016] The beneficial effects of adopting the above technical solutions are as follows: The groove can provide a designated installation position for the seal to prevent loosening along the axial direction. The shapes of the first groove and the second groove are also different. The second groove has stronger wrapping property to prevent the second seal from touching the inner wall of the oil hole and being taken out.

[0017] As a further improvement of the present utility model, the depth of the second groove is smaller than the minor axis of the elliptical cross-section contour of the second seal, and the width of the second groove is equal to the major axis of the elliptical cross-section contour of the second seal.

[0018] The beneficial effect of adopting the above technical solution is that the second groove just clamps the second sealing ring, but the outer edge of the second sealing ring is also exposed to allow it to elastically seal with the inner wall of the oil hole.

[0019] As a further improvement of the present invention, the included angles of the internal angles are all right angles.

[0020] The beneficial effect of adopting the above technical solution is that the right-angle internal angle has a better limiting effect on the sealing ring.

[0021] As a further improvement of the present invention, the oil plug column has an external thread section, and the external thread section is located between the first sealing ring and the second sealing ring.

[0022] The beneficial effect of adopting the above technical solution is that the external thread section is convenient for thread fixing.

[0023] As a further improvement of the utility model, the oil plug column has an outer hexagonal section, and the outer hexagonal section is located on a side of the first sealing ring away from the second sealing ring.

[0024] The beneficial effect of adopting the above technical solution is that the outer hexagonal section is convenient for turning the oil plug column with a wrench.

[0025] As a further improvement of the utility model, the outer wall of the oil plug column is recessed with a plurality of radial blind holes, which are arranged in a ring array around the axis of the oil plug column, and the radial blind holes are located between the external thread section and the second sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a stereogram of an embodiment of the gear pump assembly of the present application;

[0028] Figure 2 It is a front view of an embodiment of the gear pump combination of the present application;

[0029] Figure 3 It is an AA cross-sectional view of an embodiment of the gear pump combination of the present application;

[0030] Figure 4 It is a three-dimensional diagram of a first sealing ring and a second sealing ring of an embodiment of a double sealing ring oil plug of a gear pump of the present application;

[0031] Figure 5It is a perspective view of an embodiment of the double-sealing-ring oil plug of the gear pump of the present application;

[0032] Figure 6 It is an exploded view of an embodiment of the relay bundling structure of the gear pump of the present application;

[0033] Figure 7 It is a perspective view of the relay and the bonding piece of an embodiment of the relay bundling structure of the gear pump of the present application.

[0034] 1 - Motor; 2 - Pump body; 3 - Relay; 4 - Oil plug column; 41 - Second groove; 42 - First groove; 43 - External thread section; 44 - External hexagonal section; 45 - Radial blind hole; 5 - Base; 51 - Curved panel; 52 - Side plate; 53 - Extension edge; 54 - Through hole; 6 - Clamp; 61 - C-ring; 62 - Bolt rod; 7 - Bonding piece; 71 - Notch hole; 72 - Excavated hole; 73 - Upward barb; 8 - First sealing ring; 9 - Second sealing ring. Specific embodiments

[0035] The following further elaborates on the content of the present utility model in conjunction with specific embodiments:

[0036] To achieve the purpose of the present utility model, as Figures 1 to 5 , a double-sealing-ring oil plug of a gear pump includes: an oil plug column 4 that can be assembled with the pump body 2, and the pump body 2 has an oil hole for accommodating the oil plug column 4; a sealing ring sleeved on the oil plug column 4, and the outer wall of the oil plug column 4 has a groove for accommodating the sealing ring. The sealing ring includes a first sealing ring 8 and a second sealing ring 9 arranged coaxially with each other. The cross-sectional profile of the first sealing ring 8 is circular, and the cross-sectional profile of the second sealing ring 9 is elliptical. The major axis of the ellipse is parallel to the axis of the oil plug column 4, and the depth of the second sealing ring 9 in the oil hole is deeper than the depth of the first sealing ring 8 in the oil hole.

[0037] The beneficial effects of adopting the above technical solutions are as follows: The oil plug column of the present application can perform basic disassembly and assembly functions, realizing basic oil discharge and maintenance functions. In addition, the design of the double-sealing ring has better sealing performance than the single-sealing ring. Secondly, the two sealing rings are not simply existing sealing rings. The front sealing ring is relatively flat, that is, the radial thickness of the second sealing ring is thinner than its axial thickness. Therefore, the volume of the second sealing ring protruding radially is not large, which facilitates the entire oil plug column to enter and exit the oil hole without causing much assembly resistance. On the contrary, the axial dimension of the sealing ring participating in sealing is large, which is a technical detail not possessed by the traditional sealing ring with a circular cross-section. Finally, the pump body can form a gear pump combination with other components as a whole.

[0038] In some other embodiments of the present utility model, the inner diameter of the first sealing ring 8 is larger than the inner diameter of the second sealing ring 9.

[0039] The beneficial effects of adopting the above technical solution are as follows: The oil plug column is a stepped shaft, and different sealing rings are adapted to the local diameter values of the oil plug column.

[0040] In some other embodiments of the present invention, the minor axis of the elliptical cross-sectional contour of the second sealing ring 9 is smaller than the diameter of the circular cross-sectional contour of the first sealing ring 8.

[0041] The beneficial effects of adopting the above technical solution are as follows: Ensure that the second sealing ring is relatively thin radially.

[0042] In some other embodiments of the present invention, the first sealing ring 8 and the second sealing ring 9 are made of rubber or silica gel, and the oil plug column 4 is an integral metal part.

[0043] The beneficial effects of adopting the above technical solution are as follows: The sealing ring is made of flexible and elastic material.

[0044] In some other embodiments of the present invention, the groove includes a first groove 42 and a second groove 41 extending circumferentially. The first groove 42 and the second groove 41 are respectively assembled with the first sealing ring 8 and the second sealing ring 9; The inner wall of the second groove 41 has two internal corners, and the inner wall of the first groove 42 has one internal corner.

[0045] The beneficial effects of adopting the above technical solution are as follows: The groove can provide a specified installation position for the sealing ring to prevent loosening along the axial direction. The shapes of the first groove and the second groove are also different. The second groove has stronger wrapping property to prevent the second sealing ring from touching the inner wall of the oil hole and being taken out.

[0046] In some other embodiments of the present invention, the depth of the second groove 41 is smaller than the minor axis of the elliptical cross-sectional contour of the second sealing ring 9, and the width of the second groove 41 is equal to the major axis of the elliptical cross-sectional contour of the second sealing ring 9.

[0047] The beneficial effects of adopting the above technical solution are as follows: The second groove just catches the second sealing ring, but the outer edge of the second sealing ring should also be exposed to make elastic sealing with the inner wall of the oil hole.

[0048] In some other embodiments of the present invention, the included angles of the internal corners are all right angles.

[0049] The beneficial effects of adopting the above technical solution are as follows: The right-angle internal corners have a good limiting effect on the sealing ring.

[0050] As Figure 3 shown, in some other embodiments of the present invention, the oil plug column 4 has an external thread section 43, and the external thread section 43 is located between the first sealing ring 8 and the second sealing ring 9.

[0051] The inner wall of the oil hole has an internal thread section.

[0052] The beneficial effects of adopting the above technical solution are as follows: The external thread section is convenient for thread fixation.

[0053] In some other embodiments of the present utility model, the oil plug column 4 has an external hexagonal section 44, and the external hexagonal section 44 is located on the side of the first sealing ring 8 away from the second sealing ring 9.

[0054] The beneficial effects of adopting the above technical solution are as follows: The external hexagonal section is convenient for using a wrench to rotate the oil plug column.

[0055] In some other embodiments of the present utility model, a plurality of radial blind holes 45 are recessed on the outer wall of the oil plug column 4. The plurality of radial blind holes 45 are arranged in an annular array around the axis of the oil plug column 4, and the radial blind holes 45 are located between the external thread section 43 and the second sealing ring 9.

[0056] Such as Figure 1 、 Figure 6 、 Figure 7 As shown, a relay bundling structure of a gear pump includes: a fitting piece 7 that can be fixed to the relay 3. One side of the fitting piece 7 can contact the outer wall of the motor 1. The edge of the fitting piece 7 has a notch hole 71 through which a fastener can pass; the fitting piece 7 also has a plurality of upwardly turned thorns 73, and the upwardly turned thorns 73 protrude from the side of the fitting piece 7 that does not contact the motor 1; a clamp 6 that can be fixedly surrounded by the motor 1. One axial end of the motor 1 is equipped with a pump body 2; the clamp 6 can pass through between a plurality of upwardly turned thorns 73. The two side edges of the clamp 6 can contact a plurality of upwardly turned thorns 73, and the radial thickness of the clamp 6 is not greater than the protruding height of the upwardly turned thorns 73.

[0057] The motor 1, the pump body 2, and the relay 3 form a complete sellable gear pump combination.

[0058] The beneficial effects of adopting the above technical solution are as follows: The main point is that the fitting piece retains two installation forms, which can be selected according to the actual situation of different motors to be matched, so that it can be adapted to a variety of different specifications of motors. First, if there are ready-made holes or other installation positions on the outer wall of the motor, the notch hole can allow fasteners such as bolts to pass through; second, if there is a lack of matching installation positions, it can also be directly fixedly surrounded by a clamp. The clamp does not use the notch hole, but the upwardly turned thorns can play a role in limiting the clamp to prevent axial loosening of the clamp and the fitting piece.

[0059] In some other embodiments of the present utility model, the number of the upwardly turned thorns 73 is four. The consecutive connection lines between the four upwardly turned thorns 73 can form a rectangle, and two upwardly turned thorns 73 are provided on the same side of the clamp 6.

[0060] The beneficial effects of adopting the above technical solution are as follows: The four upwardly turned thorns exactly limit the left - right loosening and twisting of the clamp.

[0061] In some other embodiments of the present invention, the bonding sheet 7 has a punched hole 72 , and the bonding sheet 7 is partially bent 90° at the hole 72 to form an upward thorn 73 .

[0062] The beneficial effect of adopting the above technical solution is that the upward thorn can be formed by stamping and bending, and the processing is convenient.

[0063] In some other embodiments of the present invention, the bonding sheet 7 has two notch holes 71 , and the notches of the two notch holes 71 face opposite directions.

[0064] The beneficial effect of adopting the above technical solution is that two bolts can be used for assembly, and the notched shape of the notched hole also facilitates quick disassembly and assembly with the bolts.

[0065] In some other embodiments of the present invention, the clamp 6 includes a C-shaped ring 61 and a bolt rod 62 , and the bolt rod 62 connects two ends of the C-shaped ring 61 .

[0066] The beneficial effect of adopting the above technical solution is that the bolt rod can tighten the C-shaped ring through its own knob.

[0067] In some other embodiments of the present invention, the clamp 6 is further in contact with the base 5 , the motor 1 and the base 5 are both in contact with the inner circle of the clamp 6 , and the base 5 has a plurality of through holes 54 .

[0068] The beneficial effect of adopting the above technical solution is that the base can provide a larger fixing position, for example, making it easier to fix the entire assembly on the ground.

[0069] In some other embodiments of the present invention, the plurality of through holes 54 have more than one inner diameter value.

[0070] The total number of through holes 54 is an integral multiple of the number of types of inner diameter values thereof.

[0071] The beneficial effect of adopting the above technical solution is that the specifications of the bolts passing through the through holes can also be selected according to actual conditions.

[0072] In other embodiments of the utility model, the base 5 includes a curved panel 51, a convex surface of the curved panel 51 contacts the inner circle of the clamp 6, side panels 52 are integrally and vertically connected to both sides of the curved panel 51, and an outer edge 53 is integrally and vertically fixed to the side of the side panel 52 facing away from the curved panel 51, the two outer edges 53 coincide with the same spatial plane, and the through hole 54 is located on the outer edge 53.

[0073] The beneficial effect of adopting the above technical solution is that the outer extension edge of the base is responsible for direct surface contact and fixation with the outside.

[0074] In other embodiments of the present invention, the sizes of the base 5 , the fitting sheet 7 , and the clamp 6 along the axial direction of the motor 1 gradually decrease.

[0075] The beneficial effects of adopting the above technical solution are as follows: The clamp plays a role in surrounding and fixing, and its own thickness does not need to be too thick.

[0076] In some other embodiments of the present invention, when the clamp 6 is assembled with the fitting piece 7, the C-shaped ring 61 covers the notch hole 71.

[0077] The beneficial effects of adopting the above technical solution are as follows: In this way, the notch hole is not likely to cause suspension under the C-shaped ring, and the stability of the C-shaped ring can be ensured.

[0078] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those familiar with this technology to understand the content of the present invention and implement it. However, the protection scope of the present invention cannot be limited by this. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A double-sealing-ring oil plug for a gear pump, characterized in that, include: An oil plug, which can be assembled with a pump body, wherein the pump body has an oil hole for receiving the oil plug; A sealing ring is sleeved on the oil plug column, and the outer wall of the oil plug column is provided with a groove for accommodating the sealing ring. The sealing ring comprises a first sealing ring and a second sealing ring which are coaxially arranged with each other, the cross-sectional profile of the first sealing ring is circular, and the cross-sectional profile of the second sealing ring is elliptical, the major axis of the ellipse is parallel to the axis of the oil plug column, and the depth of the second sealing ring in the oil hole is deeper than the depth of the first sealing ring in the oil hole.

2. The double-sealing-ring oil plug of the gear pump according to claim 1, characterized in that: The inner ring diameter of the first sealing ring is greater than the inner ring diameter of the second sealing ring.

3. The double-sealing-ring oil plug of the gear pump according to claim 1, characterized in that: The minor axis of the elliptical cross-sectional profile of the second sealing ring is smaller than the diameter of the circular cross-sectional profile of the first sealing ring.

4. The double-sealing-ring oil plug of the gear pump according to claim 1, characterized in that: The first sealing ring and the second sealing ring are made of rubber or silicone, and the oil plug is an integrated metal part.

5. The double-sealing-ring oil plug of the gear pump according to claim 1, characterized in that: The groove comprises a first groove and a second groove extending in the circumferential direction, and the first groove and the second groove are respectively assembled with a first sealing ring and a second sealing ring; The inner wall of the second groove has two internal corners, and the inner wall of the first groove has one internal corner.

6. The double-sealing-ring oil plug of the gear pump according to claim 5, characterized in that: The depth of the second groove is smaller than the short axis of the elliptical cross-section profile of the second sealing ring, and the width of the second groove is equal to the long axis of the elliptical cross-section profile of the second sealing ring.

7. The double-sealing-ring oil plug of the gear pump according to claim 5, characterized in that: The included angles of the inner angles are all right angles.

8. The double-sealing-ring oil plug of the gear pump according to claim 1, characterized in that: The oil plug column has an external thread section, and the external thread section is located between the first sealing ring and the second sealing ring.

9. The double-sealing-ring oil plug of the gear pump according to claim 1, wherein: The oil plug column has an outer hexagonal section, and the outer hexagonal section is located on a side of the first sealing ring away from the second sealing ring.

10. The double-sealing-ring oil plug of the gear pump according to claim 8, characterized in that: The outer wall of the oil plug column is recessed with a plurality of radial blind holes, which are arranged in a ring array around the axis of the oil plug column. The radial blind holes are located between the external thread section and the second sealing ring.

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