CN210599372U - Pump head assembly is retrieved to plunger type measuring pump weeping - Google Patents
Pump head assembly is retrieved to plunger type measuring pump weeping Download PDFInfo
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- CN210599372U CN210599372U CN201921730596.5U CN201921730596U CN210599372U CN 210599372 U CN210599372 U CN 210599372U CN 201921730596 U CN201921730596 U CN 201921730596U CN 210599372 U CN210599372 U CN 210599372U
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- 238000007789 sealing Methods 0.000 claims abstract description 155
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 125000006850 spacer group Chemical group 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 210000004276 hyalin Anatomy 0.000 claims description 3
- 125000003003 spiro group Chemical group 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Abstract
The utility model relates to a plunger type metering pump leakage recovery pump head assembly, which comprises a pump head, an outlet valve, an inlet valve and a plunger; the port of the pump head, which is matched with the plunger piston, is provided with a sealing cavity and a backflow channel, a sealing assembly is arranged in the sealing cavity, the sealing assembly comprises a high-density sealing element, a sealing space ring and a low-density sealing element which are sequentially arranged, the sealing assembly is fixed in the sealing cavity through a sealing locking cap, the backflow cavity is arranged in the middle of the sealing cavity, which corresponds to the sealing space ring, the inlet end of the backflow channel is communicated with the backflow cavity, and the outlet end of the backflow channel is communicated with the outside of the pump head; a backflow pipe assembly communicated with the liquid inlet pipe is arranged between the backflow channel and the liquid inlet pipe; and backflow holes which are communicated with the T-shaped liquid flow channel and the backflow channel are formed in the circumferential direction of the sealing spacer ring. The plunger type metering pump leakage recovery pump head assembly realizes triple protection of double sealing and leakage backflow, prolongs the service life of the sealing component and the plunger, reduces loss and leakage, and enhances sealing effect and reliability.
Description
Technical Field
The utility model relates to a plunger type measuring pump technical field, concretely relates to pump head assembly is retrieved to plunger type measuring pump weeping.
Background
A plunger type metering pump is a device that sucks a constant flow rate of a working medium from one side and discharges the working medium from the other side by reciprocating a plunger. The plunger metering pump has been widely used in the fields of petroleum, chemical industry, pharmacy and the like due to the advantages of simple structure, high temperature resistance, high pressure resistance and the like.
The pump head assembly of the plunger type metering pump comprises parts such as a pump head, an outlet valve, an inlet valve and a plunger, wherein the outlet valve and the inlet valve are respectively connected with a liquid outlet pipe and a liquid inlet pipe, a sealing component is arranged at the sliding fit position of the plunger and the pump head to prevent working media from leaking, most of the sealing components of the existing plunger type metering pump are sealed together, the sealing effect is poor, particularly, after the using time is long, when the plunger and the sealing component are abraded in different degrees, a gap is formed between the sealing component and the plunger, the working media easily flow out of the gap to cause leakage, when the working media are inflammable liquid such as oil liquid and the like, potential safety hazards are easily generated, and when the working media are medicines or harmful substances to human health, operators are possibly injured. In order to solve the leakage problem, the plunger type metering pump needs to be regularly checked and replaced by the plunger and the sealing piece, the replacement process is complex, the replacement cost is high, and improvement is urgently needed.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the application provides a plunger type metering pump leakage recovery pump head assembly. The utility model provides a pump head assembly is retrieved to plunger type measuring pump weeping divide into the three-section with seal assembly, and the first section is high density sealing member, the centre is sealed space ring, lean on outer one section to be low density sealing member, sealed space ring department is equipped with the backward flow passageway, leads the weeping back to the feed liquor pipe, realizes that double seal adds the three protection of weeping backward flow altogether, has improved the life of seal assembly and plunger, has realized the weeping backward flow, has reduced loss and leakage, has strengthened sealed effect and reliability.
The utility model discloses the technical scheme who applies is: the plunger type metering pump leakage recovery pump head assembly comprises a pump head, an outlet valve, an inlet valve and a plunger; a T-shaped liquid flow channel is arranged in the pump head, two concentric and oppositely arranged ports of three ports of the T-shaped liquid flow channel are respectively connected with an outlet valve and an inlet valve, the ports vertical to the two ports are in sliding fit with a plunger piston, and the end parts of the outlet valve and the inlet valve are respectively provided with a liquid outlet pipe and a liquid inlet pipe; the port of the pump head, which is matched with the plunger piston, is provided with a sealing cavity and a backflow channel, a sealing assembly is arranged in the sealing cavity, the sealing assembly comprises a high-density sealing element, a sealing space ring and a low-density sealing element which are sequentially arranged, the sealing assembly is fixed in the sealing cavity through a sealing locking cap, the backflow cavity is arranged in the middle of the sealing cavity, which corresponds to the sealing space ring, the inlet end of the backflow channel is communicated with the backflow cavity, and the outlet end of the backflow channel is communicated with the outside of the pump head; a backflow pipe assembly communicated with the liquid inlet pipe is arranged between the backflow channel and the liquid inlet pipe; and backflow holes which are communicated with the T-shaped liquid flow channel and the backflow channel are formed in the circumferential direction of the sealing spacer ring.
Compared with the prior art, the plunger type metering pump weeping of this application is retrieved pump head assembly and is had following progress:
(1) good sealing effect and long service life: the sealing assembly is divided into three sections, namely a high-density sealing element, a sealing space ring and a low-density sealing element from inside to outside, the high-density sealing element is formed by high-pressure sealing filler, the high-density sealing element has high density, high compressibility, high hardness, good wear resistance, smooth inner surface and low friction coefficient, can play a plurality of roles of centering, lubricating and sealing, has long service life, prolongs the replacement period of the sealing element and the plunger piston, and reduces the use cost;
(2) the leakage backflow can be realized, the loss and the leakage are reduced: in the reciprocating motion process of the plunger, if a gap exists between the plunger and the high-density sealing element, a small amount of transmitted liquid enters the gap under the influence of working pressure, and as the amount of leaked liquid entering the gap increases, the leaked liquid converges and flows into the sealing space ring, enters the backflow channel through the backflow hole of the sealing space ring and returns to the inlet valve, so that the loss and leakage of the liquid to be transmitted are avoided;
(3) triple protection, improvement sealing capacity and sealed reliability: a low density seal is added behind the high density seal and the seal spacer ring, and only plays a role in sealing to prevent the transmission liquid which does not enter the return channel from leaking.
Preferably, the backflow cavity is a cylindrical cavity, and the cylindrical side surface of the backflow cavity is intersected and communicated with the cylindrical side surface of the backflow channel. Through the crossing connected form of side and side, looks transversal department forms the square hole, and the condition that the unable hole of punching but need be dredged in the fit for part is inside, and the liquid that gets into the backward flow chamber through the gap between high density sealing member and the plunger passes through the square hole flows into return flow channel.
Preferably, the backflow channel is of an L-shaped structure and is composed of a cylindrical hole parallel to the plunger sliding channel and a threaded hole perpendicular to the cylindrical hole, and the cylindrical hole is sealed through a sealing pin in interference fit with the cylindrical hole. The sealing pin is in interference fit with the cylindrical hole to block the outer end of the cylindrical hole, so that backflow liquid is prevented from leaking.
Preferably, the high-density sealing element and the low-density sealing element are both made of polytetrafluoroethylene, and the compression degree of the high-density sealing element is higher than that of the low-density sealing element. The high-density sealing element and the low-density sealing element are both compression-molded by polytetrafluoroethylene, the realized functions are different, the high-density sealing element bears high pressure in the manufacturing engineering of the high-density sealing element, has high and hard compression degree and good guiding, sealing and wear resistance, and the low-density sealing element bears lower pressure in the manufacturing engineering of the low-density sealing element, has low compression degree and better sealing performance and is softer; in the reciprocating motion of the plunger, the high-density sealing element can play roles of sealing, guiding, lubricating and reducing friction loss, backflow liquid flows into the backflow channel through a gap between the high-density sealing element and the plunger to realize backflow, and does not or rarely flow to the low-density sealing element, and the sealing effect of the low-density sealing element is better than that of the high-density sealing element because the low-density sealing element is softer, so that the low-density sealing element mainly plays a role of supplementary sealing, the roles of the high-density sealing element and the low-density sealing element are complementary, double sealing can be realized, backflow liquid leakage is prevented, abrasion of the plunger and sealing is reduced, the plunger and the sealing are replaced.
Preferably, the periphery of the sealing spacer ring is in a step shape, the diameter of the middle part of the periphery of the sealing spacer ring is smaller than that of the two ends of the periphery of the sealing spacer ring, and a plurality of backflow holes with axes pointing to the circle center direction of the sealing spacer ring are uniformly distributed in the middle part of the sealing spacer ring along the circumferential direction. A plurality of backflow holes are uniformly distributed in the circumferential direction of the sealing spacer ring, the angle can not be adjusted during installation, backflow liquid can flow into the backflow cavity along the backflow hole closest to the backflow hole, the periphery of the sealing spacer ring is in a step shape, and the backflow liquid can be prevented from flowing to the low-density sealing element along the cylindrical surface to affect the sealing effect.
As optimizing, the return line subassembly includes that first barb connects and second barb and connects, and first barb connects no barb end and is equipped with the screw thread, with backward flow chamber exit end spiro union, and second barb connects no barb end and links firmly with the back flow entrance, and the barb end that two barbs connect passes through the hyaline tube and connects. The barb end is connected through the transparent tube and can increase the frictional force between with the transparent tube, prevents that the transparent tube from taking off.
Preferably, the return pipe is fixedly connected with the liquid inlet pipe in a welding mode. The welding connection is convenient to operate, the stress condition is good, and the air tightness is good.
Preferably, the stroke range of the plunger does not exceed the inner end surface of the sealing cavity. The plunger stroke range does not exceed the inner end face of the sealing cavity, so that liquid can be prevented from directly entering the sealing cavity, and the sealing effect is good.
Drawings
Fig. 1 is a schematic structural view of a plunger type metering pump leakage recovery pump head assembly of the present invention;
FIG. 2 is a cross-sectional view of the plunger metering pump leakage recovery pump head assembly of the present invention;
FIG. 3 is a partial enlarged view of the plunger type metering pump leakage recovery pump head assembly of the present invention;
fig. 4 is a schematic structural view of the seal spacer of the present invention;
fig. 5 is a cross-sectional view of the packing spacer of the present invention.
The labels in the figures are:
1-pump head, 11-T-shaped liquid flow channel, 12-reflux channel, 13-reflux cavity; 2-outlet valve, 21-liquid outlet pipe; 3-inlet valve, 31-liquid inlet pipe; 4-a plunger; 5-sealing the locking cap; 6-seal assembly, 61-high density seal, 62-seal spacer, 621-return hole, 63-low density seal; 7-a return tube assembly, 71-a first barbed connector, 72-a transparent tube, 73-a second barbed connector, 74-a return tube; 8-sealing pin.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments (examples), which are described herein for illustrative purposes only and are not intended to be a basis for limiting the present invention.
Referring to fig. 1-5, a pump head assembly of a prior art plunger metering pump includes a pump head 1, an outlet valve 2, an inlet valve 3, and a plunger 4; a T-shaped liquid flow channel 11 is arranged in the pump head 1, two concentric and oppositely arranged ports of three ports of the T-shaped liquid flow channel 11 are respectively connected with an outlet valve 2 and an inlet valve 3, the ports vertical to the two ports are in sliding fit with a plunger 4, and the end parts of the outlet valve 2 and the inlet valve 3 are respectively provided with a liquid outlet pipe 21 and a liquid inlet pipe 31; the utility model discloses a pump head assembly of plunger type measuring pump still includes weeping recovery unit, pump head 1 is equipped with seal chamber and return channel 12 with plunger 4 complex port, and the inside seal chamber is equipped with seal assembly 6, seal assembly 6 is high density sealing member 61, seal spacer ring 62 and the low density sealing member 63 that set gradually, seal assembly 6 is fixed in the seal chamber by sealed locking cap 5, the position that corresponds in the middle part of the seal chamber and seal spacer ring 62 is equipped with return channel 13, return channel 12 entry end and return channel 13 intercommunication, exit end and pump head 1 outer intercommunication; a return pipe assembly 7 communicated with the return channel 12 is arranged between the return channel and the liquid inlet pipe 31; the sealing spacer ring 62 is provided with a backflow hole 621 which is communicated with the T-shaped liquid flow channel 11 and the backflow channel 12 in the circumferential direction.
The sealing component 6 is divided into three sections, namely a high-density sealing element 61, a sealing space ring 62 and a low-density sealing element 63 from inside to outside, wherein the high-density sealing element 61 has high density and high compression degree, when the high-density sealing element is assembled, the pressure applied to the high-density sealing element by the sealing spacer ring 62 is also borne, so that the high-density sealing element 61 has a small amount of deformation, the high-density sealing element is tightly attached to the inner wall of the sealing cavity and the periphery of the plunger 4 to play a plurality of roles of centering, lubricating and sealing, if the plunger 4 wears the high-density sealing element 61 in the moving process, a gap is formed between the high-density sealing element 61 and the sealing cavity, the high-density sealing element 61 can expand due to the bearing pressure, the gap is filled, and a real gap can not be formed due to the abrasion until the high-density sealing element, therefore, the sectional type sealing has good sealing performance and long service life, prolongs the replacement period of the sealing element and the plunger 4 and reduces the use cost; after a gap exists between the plunger 4 and the high-density sealing element 61, a small amount of liquid to be transmitted enters the gap under the influence of working pressure, and as the liquid entering the gap increases, the liquid flows into the sealing space ring 62 in a confluence manner, enters the return channel 12 through the return hole 621 of the sealing space ring 62 and returns to the liquid inlet pipe 31, so that the loss and leakage of the liquid to be transmitted are avoided; a low density seal 63 added behind the high density seal 61 and the seal spacer 62 only seals against leakage of the transfer fluid that does not enter the return passage 12.
As a specific example: the return cavity 13 is a cylindrical cavity, and the cylindrical side surface of the return cavity is intersected and communicated with the cylindrical side surface of the return channel 12.
The backflow channel 12 is of an L-shaped structure and is composed of a cylindrical hole parallel to the sliding channel of the plunger 4 and a threaded hole perpendicular to the cylindrical hole, and the cylindrical hole is sealed through a sealing pin 8 in interference fit with the cylindrical hole.
The high-density sealing element 61 and the low-density sealing element 63 are both formed by compression molding of polytetrafluoroethylene, and the compression degree of the high-density sealing element 61 is higher than that of the low-density sealing element 63.
The periphery of the sealing spacer ring 62 is in a step shape, the diameter of the middle part of the periphery of the sealing spacer ring 62 is smaller than that of the two ends, and 6 backflow holes 621 with axes pointing to the circle center direction of the sealing spacer ring 62 are uniformly distributed in the middle part along the circumferential direction.
The return pipe 74 is fixedly connected with the liquid inlet pipe 31 in a welding mode. The stroke range of the plunger 4 does not exceed the inner end surface of the sealing cavity.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The plunger type metering pump leakage recovery pump head assembly comprises a pump head (1), an outlet valve (2), an inlet valve (3) and a plunger (4); a T-shaped liquid flow channel (11) is arranged in the pump head (1), two concentric and oppositely arranged ports of three ports of the T-shaped liquid flow channel (11) are respectively connected with an outlet valve (2) and an inlet valve (3), the ports vertical to the two ports are in sliding fit with a plunger (4), and the end parts of the outlet valve (2) and the inlet valve (3) are respectively provided with a liquid outlet pipe (21) and a liquid inlet pipe (31); the method is characterized in that:
a sealing cavity and a backflow channel (12) are arranged at a port where the pump head (1) is matched with the plunger (4), a sealing assembly (6) is arranged in the sealing cavity, the sealing assembly (6) is a high-density sealing element (61), a sealing space ring (62) and a low-density sealing element (63) which are sequentially arranged, the sealing assembly (6) is fixed in the sealing cavity through a sealing locking cap (5), a backflow cavity (13) is arranged at the position corresponding to the sealing space ring (62) in the middle of the sealing cavity, the inlet end of the backflow channel (12) is communicated with the backflow cavity (13), and the outlet end of the backflow channel is communicated with the outside of the pump head (1); a return pipe assembly (7) communicated with the liquid inlet pipe (31) is arranged between the return channel (12) and the liquid inlet pipe;
and the sealing space ring (62) is provided with a backflow hole (621) which is communicated with the T-shaped liquid flow channel (11) and the backflow channel (12).
2. The plunger metering pump weep recovery pump head assembly of claim 1, wherein: the backflow cavity (13) is a cylindrical cavity, and the cylindrical side surface of the backflow cavity is intersected and communicated with the cylindrical side surface of the backflow channel (12).
3. The plunger metering pump weep recovery pump head assembly of claim 1, wherein: the backflow channel (12) is of an L-shaped structure and is composed of a cylindrical hole parallel to a sliding channel of the plunger (4) and a threaded hole perpendicular to the cylindrical hole, and the cylindrical hole is sealed through a sealing pin (8) in interference fit with the cylindrical hole.
4. The plunger metering pump weep recovery pump head assembly of claim 1, wherein: the high-density sealing element (61) and the low-density sealing element (63) are both made of polytetrafluoroethylene, and the compression degree of the high-density sealing element (61) is higher than that of the low-density sealing element (63).
5. The plunger metering pump weep recovery pump head assembly of claim 1, wherein: the periphery of the sealing spacer ring (62) is in a step shape, the diameter of the middle part of the periphery of the sealing spacer ring (62) is smaller than that of the two ends, and a plurality of backflow holes (621) with axes pointing to the circle center direction of the sealing spacer ring (62) are uniformly distributed in the middle part of the sealing spacer ring along the circumferential direction.
6. The plunger metering pump weep recovery pump head assembly of claim 1, wherein: return pipe subassembly (7) are including first barb joint (71) and second barb joint (73), and first barb joint (71) does not have the barb end and is equipped with the screw thread, with backward flow chamber (13) exit end spiro union, and second barb joint (73) does not have the barb end and links firmly with back flow (74) entrance, and the barb end that two barbs connect is passed through hyaline tube (72) and is connected.
7. The plunger metering pump weep recovery pump head assembly of claim 6, wherein: the return pipe (74) is fixedly connected with the liquid inlet pipe (31) in a welding mode.
8. A plunger metering pump weep recovery pump head assembly as claimed in any one of claims 1 to 7, wherein: the stroke range of the plunger (4) does not exceed the inner end surface of the sealing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921730596.5U CN210599372U (en) | 2019-10-16 | 2019-10-16 | Pump head assembly is retrieved to plunger type measuring pump weeping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921730596.5U CN210599372U (en) | 2019-10-16 | 2019-10-16 | Pump head assembly is retrieved to plunger type measuring pump weeping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210599372U true CN210599372U (en) | 2020-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921730596.5U Active CN210599372U (en) | 2019-10-16 | 2019-10-16 | Pump head assembly is retrieved to plunger type measuring pump weeping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210599372U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962844A (en) * | 2022-04-26 | 2022-08-30 | 重庆海浦洛自动化科技有限公司 | Energy storage device for high-viscosity medium and use method thereof |
| CN115263707A (en) * | 2022-07-13 | 2022-11-01 | 德帕姆(杭州)泵业科技有限公司 | Backflow type leakage-free plunger metering pump |
| CN117212144A (en) * | 2023-10-12 | 2023-12-12 | 成都同流科技有限公司 | Anti-leakage rotary plunger pump |
-
2019
- 2019-10-16 CN CN201921730596.5U patent/CN210599372U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962844A (en) * | 2022-04-26 | 2022-08-30 | 重庆海浦洛自动化科技有限公司 | Energy storage device for high-viscosity medium and use method thereof |
| CN115263707A (en) * | 2022-07-13 | 2022-11-01 | 德帕姆(杭州)泵业科技有限公司 | Backflow type leakage-free plunger metering pump |
| CN117212144A (en) * | 2023-10-12 | 2023-12-12 | 成都同流科技有限公司 | Anti-leakage rotary plunger pump |
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| GR01 | Patent grant | ||
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Denomination of utility model: Plunger metering pump leakage recovery pump head assembly Effective date of registration: 20231022 Granted publication date: 20200522 Pledgee: Zhejiang Sanmen Yinzuo Village Bank Co.,Ltd. Pledgor: ZHEJIANG AILIFENTE PUMP TECHNOLOGY CO.,LTD. Registration number: Y2023330002392 |