CN216306195U - Pull rod non-contact sealing structure of vertical reciprocating pump - Google Patents
Pull rod non-contact sealing structure of vertical reciprocating pump Download PDFInfo
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- CN216306195U CN216306195U CN202123183144.XU CN202123183144U CN216306195U CN 216306195 U CN216306195 U CN 216306195U CN 202123183144 U CN202123183144 U CN 202123183144U CN 216306195 U CN216306195 U CN 216306195U
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- pull rod
- plunger
- inner cylinder
- reciprocating pump
- vertical reciprocating
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Abstract
The utility model relates to a pull rod non-contact sealing structure of a vertical reciprocating pump, which comprises the vertical reciprocating pump, wherein the vertical reciprocating pump comprises a hydraulic end and a power end; the power end is in transmission connection with a plunger in the hydraulic end; the upper surface of the hydraulic cylinder body is provided with a vertically downward plunger piston hole and the plunger piston is vertically accommodated in the plunger piston hole; an inner cylinder is sleeved outside the pull rod, and the pull rod is in clearance fit with the inner cylinder and the pull rod hole; the top end of the inner cylinder has a distance to the upper surface of the liquid cylinder body so as to play a role in water prevention. According to the utility model, the inner cylinder fixedly connected with the hydraulic cylinder body is arranged outside the pull rod, the inner cylinder and the hydraulic cylinder body are stationary, the static seal is arranged, and the gap is arranged between the inner cylinder and the pull rod, so that when the dynamic seal on the plunger is leaked, the leaked liquid is blocked by the inner cylinder, and further leakage into the transmission box body is avoided; and a gap exists between the inner cylinder and the pull rod, so that non-contact is formed, the service life of the sealing structure is prolonged, and the reliability is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of reciprocating pumps, and particularly relates to a pull rod non-contact sealing structure of a vertical reciprocating pump.
Background
Reciprocating pumps, which rely on the reciprocating motion of a piston (or plunger) to change the volume of a working cylinder to deliver a liquid, are positive displacement pumps. The reciprocating pump comprises a power end and a hydraulic end, wherein the power end is used for realizing power input and motion mode conversion and mainly comprises a crankshaft, a machine body, a connecting rod and a crosshead; the hydraulic end is used for converting mechanical energy into pressure energy and directly conveying liquid and mainly comprises a pump head body, a piston (plunger), a liquid inlet valve, a liquid outlet valve, a filling body and a valve body.
In the vertical reciprocating pump, no matter the hydraulic end is above or the transmission end is above, a part passes through the hydraulic end and the transmission end, the part reciprocates, the traditional sealing mode adopts molded rubber sealing or packing sealing, the two types of sealing have leakage, and the leakage amount is larger along with the aggravation of abrasion.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the utility model is to provide a pull rod non-contact sealing structure of a vertical reciprocating pump, so that the problem of leakage increase caused by the aggravation of part abrasion is avoided, and the effects of ensuring no leakage, prolonging the sealing service life and greatly improving the reliability are achieved.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a pull rod non-contact sealing structure of a vertical reciprocating pump comprises the vertical reciprocating pump, wherein the vertical reciprocating pump comprises a hydraulic end and a power end, the power end is arranged in a transmission box body, the hydraulic end is arranged in a hydraulic cylinder body, and the hydraulic cylinder body is connected to the upper surface of the transmission box body; the power end is in transmission connection with the plunger in the hydraulic end through a pull rod which extends upwards and movably penetrates out of the upper surface of the transmission box body; the upper surface of the hydraulic cylinder body is provided with a vertically downward plunger piston hole and the plunger piston is vertically accommodated in the plunger piston hole; the hydraulic cylinder body is hermetically connected with a stuffing box, and the lower part of the plunger movably penetrates through the stuffing box and extends into the plunger hole; the upper end of the pull rod penetrates through a pull rod hole formed in the hydraulic cylinder body in a penetrating manner and movably penetrates through the upper end of the plunger and is in transmission connection with the upper end of the plunger; the method is characterized in that: an inner cylinder is sleeved outside the pull rod, and the pull rod is in clearance fit with the inner cylinder and the pull rod hole; the upper surface of the hydraulic cylinder body is also provided with a vertically downward groove, the groove and the pull rod hole are coaxially arranged, and the lower part of the inner cylinder is in contact with the inner surface of the groove and is fixed in a sealing manner; the top end of the inner cylinder has a distance to the upper surface of the liquid cylinder body so as to play a role in water prevention.
Further perfecting the technical scheme, the top end of the inner cylinder is higher than the top end of the stuffing box.
Furthermore, the hydraulic end also comprises a horizontal pressing plate, and the pressing plate is fixed with the pull rod and the upper parts of the plungers so as to realize the transmission connection of the pull rod and the plungers, thereby facilitating the pull rod to drive the plungers to reciprocate.
Furthermore, a circle of annular bulge extends on the pull rod along the radial direction of the pull rod, the pressure plate is abutted against the upper surface of the annular bulge, and the pull rod section above the annular bulge penetrates through the pressure plate and is connected with the nut; an outer cylinder coaxial with the inner cylinder is fixedly arranged outside the annular bulge so that the outer cylinder can synchronously reciprocate along with the pull rod; the lower end of the outer barrel and the upper end of the inner barrel are mutually lapped, the inner diameter of the outer barrel is larger than the outer diameter of the inner barrel, and a gap is formed between the outer barrel and the inner barrel.
Further, the sum of the height of the outer cylinder and the height of the part of the inner cylinder, which is positioned outside the upper surface of the liquid cylinder body, is greater than the distance between the lower surface of the pressure plate and the upper surface of the liquid cylinder body when the plunger moves to the highest stroke.
Further, the power end further comprises a crankshaft, a connecting rod and a crosshead; the crankshaft is horizontally arranged in the transmission case and is in transmission connection with a speed reducing mechanism arranged in the transmission case so as to synchronously rotate along with the speed reducing mechanism; the connecting rod extends upwards and comprises a big head, a small head and a rod body, the big head is rotationally connected with an eccentric connecting rod journal on the crankshaft, the small head is hinged with a crosshead above the crankshaft, the rod body is connected with the big head and the small head, and the crosshead is vertically connected in a crosshead slide way fixedly arranged in the transmission case in a sliding fit manner; the lower end of the pull rod is connected with the crosshead to reciprocate up and down along with the crosshead.
Further, the crankshaft is driven to rotate and then further drives the connecting rod and the crosshead to reciprocate, and the crosshead further drives the pull rod to reciprocate, so that the plunger is driven to reciprocate in the plunger hole.
Further, a static seal is arranged between the lower part of the inner cylinder and the groove.
Further, a plunger seal is arranged in the stuffing box and forms the dynamic seal.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the pull rod non-contact sealing structure of the vertical reciprocating pump, the inner cylinder fixedly connected with the hydraulic cylinder body is arranged outside the pull rod, the inner cylinder and the hydraulic cylinder body are stationary, a gap is formed between the inner cylinder and the pull rod, and the top end of the inner cylinder is higher than the top end of the stuffing box. Therefore, when the dynamic seal on the plunger is leaked, the leaked liquid is blocked by the inner cylinder, and further leakage into the transmission box body is avoided; and a gap exists between the inner cylinder and the pull rod, so that a non-contact kinematic pair is formed, the service life of the sealing structure is prolonged, and the reliability is greatly improved.
2. The utility model relates to a pull rod non-contact sealing structure of a vertical reciprocating pump.A outer cylinder is further arranged outside an inner cylinder, and the outer cylinder and a positioning part on a pull rod form a whole and do reciprocating motion along with the pull rod; in the movement process of the inner cylinder and the outer cylinder, a section of part is overlapped between the inner cylinder and the outer cylinder all the time, so that splashing liquid is further prevented from entering the transmission box body, gaps also exist among the outer cylinder, the inner cylinder and the pull rod, a non-contact kinematic pair is formed, and non-contact of the whole sealing structure is realized.
Drawings
FIG. 1 is a schematic structural view of a non-contact sealing structure of a pull rod of a vertical reciprocating pump according to an embodiment;
FIG. 2 is an enlarged view of a portion of the upper portion of FIG. 1;
the device comprises a transmission case body 1, a hydraulic cylinder body 2, a pull rod 3, an annular bulge 31, a plunger 4, a stuffing box 5, a plunger seal 51, an inner cylinder 6, a pressing plate 7, an outer cylinder 8, a crankshaft 91, a connecting rod 92 and a crosshead 93.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1-2, a non-contact sealing structure for a pull rod of a vertical reciprocating pump according to an embodiment includes a vertical reciprocating pump, the vertical reciprocating pump includes a power end and a power end, the power end is disposed in a transmission case 1, the power end is disposed in a hydraulic cylinder 2, and the hydraulic cylinder 2 is connected to an upper surface of the transmission case 1; the power end is in transmission connection with a plunger 4 in the hydraulic end through a pull rod 3 which extends upwards and movably penetrates out of the upper surface of the transmission box body 1; the upper surface of the liquid cylinder body 2 is provided with a vertically downward plunger piston hole and the plunger piston 4 is vertically accommodated; the liquid cylinder body 2 is hermetically connected with a stuffing box 5, and the lower part of the plunger 4 movably penetrates through the stuffing box 5 and extends into the plunger hole; the upper end of the pull rod 3 penetrates through a pull rod hole formed in the hydraulic cylinder body 3 in a penetrating manner and is in transmission connection with the upper end of the plunger 4; an inner barrel 6 is sleeved outside the pull rod 3, and the pull rod 3, the inner barrel 6 and the pull rod hole are in clearance fit; the upper surface of the hydraulic cylinder body 2 is also provided with a vertically downward groove, the groove and the pull rod hole are coaxially arranged, and the lower part of the inner cylinder 6 is in contact with the inner surface of the groove and is fixed in a sealing manner; the top end of the inner cylinder 6 is spaced from the upper surface of the liquid cylinder body 2 to achieve a waterproof effect. The top end of the inner cylinder 6 is higher than the top end of the stuffing box 5.
According to the pull rod non-contact sealing structure of the vertical reciprocating pump, the inner cylinder 6 fixedly connected with the liquid cylinder body 2 is arranged outside the pull rod 3, the inner cylinder 6 and the liquid cylinder body 2 are stationary, a gap is formed between the inner cylinder 6 and the pull rod 3, and the top end of the inner cylinder 6 is higher than the top end of the stuffing box 5. Thus, when the dynamic seal on the plunger 4 leaks, the leaked liquid is blocked by the inner cylinder 6, and further leakage into the transmission case 1 is avoided; and a gap exists between the inner cylinder 6 and the pull rod 3, so that non-contact is formed, the service life of the sealing structure is prolonged, and the reliability is greatly improved.
With continued reference to fig. 1-2, the hydraulic end further includes a horizontal pressing plate 7, and the pressing plate 7 is fixed to the upper portions of the pull rod 3 and the plunger 4 to realize the transmission connection between the pull rod 3 and the plunger 4, so that the pull rod 3 drives the plunger 4 to reciprocate.
In this way, the pressure plate 7 ensures that the pull rod 3 can drive the plunger 4 to reciprocate.
A circle of annular bulge 31 extends on the pull rod 3 along the radial direction of the pull rod 3, the pressure plate 7 abuts against the upper surface of the annular bulge 31, and the pull rod section above the annular bulge 31 penetrates through the pressure plate 7 and is connected with a nut; an outer cylinder 8 coaxial with the inner cylinder 6 is fixedly arranged outside the annular bulge 31 so that the outer cylinder 8 can synchronously reciprocate along with the pull rod 3; the lower end of the outer cylinder 8 and the upper end of the inner cylinder 6 are mutually lapped, the inner diameter of the outer cylinder 8 is larger than the outer diameter of the inner cylinder 6, and a gap is formed between the outer cylinder 8 and the inner cylinder 6. The sum of the height of the outer cylinder 8 and the height of the part of the inner cylinder 6 outside the upper surface of the liquid cylinder body 2 is larger than the distance between the lower surface of the pressure plate 7 and the upper surface of the liquid cylinder body 2 when the plunger 4 moves to the highest stroke.
Thus, the outer cylinder 8 is arranged outside the inner cylinder 6, and the outer cylinder 8 and the positioning part 31 on the pull rod 3 form a whole and reciprocate with the pull rod 3; in the movement process of the inner cylinder 6 and the outer cylinder 8, a section of part of the inner cylinder and the outer cylinder is overlapped all the time, so that splashing liquid is further prevented from entering the transmission box body 1, gaps also exist among the outer cylinder 8, the inner cylinder 6 and the pull rod 3, no contact is formed, and no contact of the whole sealing structure is realized.
Wherein the power end further comprises a crankshaft 91, a connecting rod 92 and a crosshead 93; the crankshaft 91 is horizontally placed in the transmission case 1 and is in transmission connection with a speed reducing mechanism (not shown in the figure) arranged in the transmission case 1 so as to synchronously rotate along with the speed reducing mechanism; the connecting rod 92 extends upwards and comprises a big head, a small head and a rod body, the big head is rotationally connected with an eccentric connecting rod journal on the crankshaft 91, the small head is hinged with a crosshead 93 above the crankshaft 91, the rod body is connected with the big head and the small head, and the crosshead 93 is vertically connected in a crosshead slide way fixedly arranged in the transmission box body 1 in a sliding fit manner; the lower end of the draw bar 3 is connected to a crosshead 93 to reciprocate up and down with the crosshead 93. The crankshaft 91 is driven to rotate and then further drives the connecting rod 92 and the crosshead 93 to reciprocate, and the crosshead 93 further drives the pull rod 3 to reciprocate so as to drive the plunger 4 to reciprocate in the plunger hole.
When in implementation, the speed reducing mechanism can be a belt pulley, a gear speed reducing transmission device or a worm and gear, which are all the prior art, so detailed description is not needed; and the transmission case body 1 should be externally connected with a motor in transmission connection with the speed reducing mechanism for driving the speed reducing mechanism to further drive the crankshaft 91 to rotate, and finally the plunger 4 can reciprocate up and down.
Wherein, a static seal is arranged between the lower part of the inner cylinder 6 and the groove. The stuffing box 5 is internally provided with a plunger seal 51 and forms a dynamic seal.
Thus, the connection surface between the inner cylinder 6 and the cylinder body 2 is static seal, and leakage is avoided.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1. A pull rod non-contact sealing structure of a vertical reciprocating pump comprises the vertical reciprocating pump, wherein the vertical reciprocating pump comprises a hydraulic end and a power end, the power end is arranged in a transmission box body, the hydraulic end is arranged in a hydraulic cylinder body, and the hydraulic cylinder body is connected to the upper surface of the transmission box body; the power end is in transmission connection with the plunger in the hydraulic end through a pull rod which vertically extends upwards and movably penetrates through the upper surface of the transmission box body; the upper surface of the hydraulic cylinder body is provided with a vertically downward plunger piston hole and the plunger piston is vertically accommodated in the plunger piston hole; the hydraulic cylinder body is hermetically connected with a stuffing box, and the lower part of the plunger movably penetrates through the stuffing box and extends into the plunger hole; the upper end of the pull rod penetrates through a pull rod hole formed in the hydraulic cylinder body in a penetrating manner and movably penetrates through the upper end of the plunger and is in transmission connection with the upper end of the plunger;
the method is characterized in that: an inner cylinder is sleeved outside the pull rod, and the pull rod is in clearance fit with the inner cylinder and the pull rod hole; the upper surface of the hydraulic cylinder body is also provided with a vertically downward groove, the groove and the pull rod hole are coaxially arranged, and the lower part of the inner cylinder is in contact with the inner surface of the groove and is fixed in a sealing manner; the top end of the inner cylinder has a distance to the upper surface of the liquid cylinder body so as to play a role in water prevention.
2. The non-contact sealing structure of the pull rod of the vertical reciprocating pump according to claim 1, wherein: the top end of the inner cylinder is higher than the top end of the stuffing box.
3. The non-contact sealing structure of the pull rod of the vertical reciprocating pump according to claim 1, wherein: the hydraulic end also comprises a horizontal pressing plate, and the pressing plate is fixed with the upper parts of the pull rod and the plunger so as to realize the transmission connection of the pull rod and the plunger, thereby facilitating the pull rod to drive the plunger to reciprocate.
4. The non-contact sealing structure of the pull rod of the vertical reciprocating pump according to claim 3, wherein: a circle of annular bulge is arranged on the pull rod in a radial extending mode along the pull rod, the pressure plate abuts against the upper surface of the annular bulge, and the pull rod section above the annular bulge penetrates through the pressure plate and is connected with the nut; an outer cylinder coaxial with the inner cylinder is fixedly arranged outside the annular bulge so that the outer cylinder can synchronously reciprocate along with the pull rod; the lower end of the outer barrel is in lap joint with the upper end of the inner barrel, and the inner diameter of the outer barrel is larger than the outer diameter of the inner barrel.
5. The non-contact sealing structure of the pull rod of the vertical reciprocating pump according to claim 4, wherein: the sum of the height of the outer cylinder and the height of the part of the inner cylinder, which is positioned outside the upper surface of the liquid cylinder body, is greater than the distance between the lower surface of the pressure plate and the upper surface of the liquid cylinder body when the plunger moves to the highest stroke.
6. The non-contact sealing structure of the pull rod of the vertical reciprocating pump according to claim 1, wherein: the power end also comprises a crankshaft, a connecting rod and a crosshead; the crankshaft is horizontally arranged in the transmission case and is in transmission connection with a speed reducing mechanism arranged in the transmission case so as to synchronously rotate along with the speed reducing mechanism; the connecting rod extends upwards and comprises a big head, a small head and a rod body, the big head is rotationally connected with an eccentric connecting rod journal on the crankshaft, the small head is hinged with a crosshead above the crankshaft, the rod body is connected with the big head and the small head, and the crosshead is vertically connected in a crosshead slide way fixedly arranged in the transmission case in a sliding fit manner; the lower end of the pull rod is connected with the crosshead to reciprocate up and down along with the crosshead.
7. The non-contact sealing structure of the pull rod of the vertical reciprocating pump according to claim 6, wherein: the crankshaft is driven to rotate and then further drives the connecting rod and the crosshead to do reciprocating motion, and the crosshead further drives the pull rod to do reciprocating motion so as to drive the plunger to do reciprocating motion in the plunger hole.
8. The non-contact sealing structure of a drawbar of a vertical reciprocating pump according to any one of claims 1 to 7, characterized in that: and a static seal is arranged between the lower part of the inner cylinder and the groove.
9. The non-contact sealing structure of a drawbar of a vertical reciprocating pump according to any one of claims 1 to 7, characterized in that: and a plunger is arranged in the stuffing box for sealing and forming dynamic seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123183144.XU CN216306195U (en) | 2021-12-17 | 2021-12-17 | Pull rod non-contact sealing structure of vertical reciprocating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123183144.XU CN216306195U (en) | 2021-12-17 | 2021-12-17 | Pull rod non-contact sealing structure of vertical reciprocating pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216306195U true CN216306195U (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123183144.XU Active CN216306195U (en) | 2021-12-17 | 2021-12-17 | Pull rod non-contact sealing structure of vertical reciprocating pump |
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| Country | Link |
|---|---|
| CN (1) | CN216306195U (en) |
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2021
- 2021-12-17 CN CN202123183144.XU patent/CN216306195U/en active Active
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