CN111336096B - Piston pump with first opening and then closing sealing structure - Google Patents
Piston pump with first opening and then closing sealing structure Download PDFInfo
- Publication number
- CN111336096B CN111336096B CN202010250422.XA CN202010250422A CN111336096B CN 111336096 B CN111336096 B CN 111336096B CN 202010250422 A CN202010250422 A CN 202010250422A CN 111336096 B CN111336096 B CN 111336096B
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- piston
- sealing
- driving member
- assembly
- cavity
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- 238000007789 sealing Methods 0.000 title claims abstract description 136
- 230000000670 limiting effect Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 238000005192 partition Methods 0.000 claims description 16
- 230000035515 penetration Effects 0.000 claims 2
- 230000007547 defect Effects 0.000 abstract description 3
- 239000013013 elastic material Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 description 14
- 230000006872 improvement Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention discloses a piston pump with a first-opening and first-closing sealing structure, which comprises a piston cylinder shell, wherein a cavity is arranged in the piston cylinder shell, a sealing component and a piston component are penetrated in the cavity, a driving piece is also arranged in the cavity, the driving piece can drive the sealing component to move to a limit position firstly and then drive the piston component to move, the invention overcomes the defect that the deformation of a one-way valve made of elastic materials has obvious hysteresis due to the self-material of the one-way valve, so that the suction inlet is in an opened state and the discharge outlet is in a closed state before the suction operation of the piston pump, and the suction inlet is in a closed state and the discharge outlet is in an opened state before the discharge operation of the piston pump. The efficiency loss of the piston pump caused by the hysteresis problem of the one-way valve is reduced or even eliminated, so that the piston pump can operate at a higher speed.
Description
Technical Field
The invention relates to a piston pump, in particular to a piston pump with a sealing structure which is opened and closed firstly.
Background
The traditional piston pump comprises a piston driving rod, a piston and a piston cylinder, wherein a suction inlet and a discharge outlet are arranged on the piston cylinder, and valve structures are arranged on the suction inlet and the discharge outlet of the piston cylinder, so that a channel of the suction inlet is in an open state and a channel of the discharge outlet is in a closed state in the process of sucking medium of the piston pump, and the channel of the discharge outlet is in an open state and the channel of the suction inlet is in a closed state in the process of discharging medium of the piston pump, thus the operation of sucking the medium can be completed. The valve structure of the suction inlet and the discharge outlet of the existing piston pump is generally made of elastic material, and the working principle is that the installation directions of the check valves of the suction inlet and the discharge outlet are opposite, the check valve of the suction inlet generates elastic deformation towards the inner direction of the piston cylinder under the action of negative pressure in the process of pumping media of the piston pump, so that the check valve of the suction inlet is in an open state, the check valve of the discharge outlet is pressed by air pressure outside the cylinder under the action of negative pressure to generate elastic deformation to be closely attached to the discharge outlet, so that the passage of the discharge outlet is in a closed state, the check valve of the suction inlet generates elastic deformation towards the outer direction of the piston cylinder under the action of the internal pressure of the piston cylinder in the process of discharging media of the piston pump, so that the passage of the suction inlet is in a closed state, and the check valve of the discharge outlet is pushed open under the action of the internal pressure of the piston cylinder, so that the passage of the discharge outlet is in an open state.
However, due to the self-material of the elastic check valve, the deformation of the elastic check valve has obvious hysteresis, namely, the check valve of the suction inlet is in an open state at the last moment when the piston pump finishes the operation of sucking the medium; the piston can immediately enter the process of discharging medium under the action of the driving rod, but the closing and opening of the check valve are completed by self deformation, at the moment, the check valve of the suction port is converted from open to closed, the check valve of the discharge port is converted from closed to open, the check valve is completed by time, and the corresponding state cannot be immediately entered, namely the hysteresis of the check valve, and the check valve of the suction port is still in an open state within a small period of time when the piston pump enters the discharge state from the suction state due to the hysteresis, and the check valve of the discharge port is still in a closed state, namely a part of medium flows outside the suction port along the suction port when the piston compresses the medium, so that efficiency loss is caused, and the efficiency loss is more obvious when the driving speed of the piston driving rod is faster, so that the efficiency of high-speed operation of the piston pump is restricted.
Disclosure of Invention
The present invention aims to overcome the above-mentioned drawbacks of the prior art by providing a piston pump with a first-open-first-closed sealing structure.
In order to solve the defects in the prior art, the technical scheme provided by the invention is that the piston pump with the first-opening and first-closing sealing structure comprises a piston cylinder shell, wherein a cavity is arranged in the piston cylinder shell, a sealing component and a piston component are arranged in the cavity in a penetrating way, and a driving piece is also arranged in the cavity and can drive the sealing component to move to a limit position firstly and then drive the piston component to move;
The sealing assembly and the piston assembly move downwards to suck air in the cavity, and the sealing assembly and the piston assembly move upwards to exhaust air in the cavity.
The invention is an improvement of a piston pump with a first-opening and first-closing sealing structure, the end part of the piston cylinder shell is provided with a suction inlet, one side of the piston cylinder shell is provided with a discharge outlet, the initial state of the sealing component is that the suction inlet is sealed, and the sealing component is in a closed state when the driving component drives the suction inlet to be opened.
As an improvement of the piston pump with the first-opening and first-closing sealing structure, the driving piece drives the sealing component to move to be separated from the suction inlet, the position of the piston component is not moved, the suction inlet is opened, and the discharge outlet is closed.
As an improvement of the piston pump with the first-opening and first-closing sealing structure, when the driving piece drives the sealing component to move to the limit position, the driving piece is separated from the sealing component, the driving piece continuously moves downwards and drives the piston component to move together, the suction inlet is communicated with the cavity, and the cavity is in a suction state.
As an improvement of the piston pump with the first-opening and first-closing sealing structure, the driving piece moves upwards and drives the sealing component to move upwards together until the suction inlet is sealed, the suction inlet is closed, the discharge outlet is opened, the driving piece continues to move upwards and drives the piston component to move upwards, and the cavity is in an exhaust state.
As an improvement of the piston pump with the first opening and first closing sealing structure, the sealing assembly comprises a sealing rod, a first sealing block and a second sealing block are arranged at one end of the sealing rod at intervals, two clamping positions are arranged at the other end of the sealing rod at intervals, when the sealing assembly is in an initial state, the driving piece is connected to the first clamping position through an elastic ring or an elastic assembly, when the driving piece drives the sealing assembly to move to a limit position, the driving piece is disconnected with the first clamping position, and when the driving piece drives the piston assembly to move continuously, the driving piece drives the elastic ring or the elastic assembly to slide to the second clamping position;
the second sealing block seals the exhaust port during the suction of the suction port, and the first sealing block seals the suction port during the exhaust of the exhaust port.
As an improvement of the piston pump with the first-opening and first-closing sealing structure, the piston assembly comprises a piston rod, the upper end of the piston rod is sleeved with a piston, the lower end of the piston rod is provided with a limiting groove, the driving piece can move up and down in the limiting groove, the lower end of the sealing rod is arranged on the piston rod and the driving piece in a penetrating way, the lower end of the piston rod is arranged on the driving piece in a penetrating way, and the upper part of the driving piece is provided with an accommodating groove matched with the limiting groove.
As an improvement of the piston pump with the first opening and first closing sealing structure, a partition plate is arranged in the cavity, the upper end of the sealing rod penetrates through the partition plate, the partition plate is positioned between the first sealing block and the second sealing block, one end of the partition plate is provided with a stop block, the stop block and the side wall of the cavity form an air inlet channel, the partition plate separates the cavity to form an air inlet cavity and an air collecting cavity, and the air inlet cavity and the air collecting cavity are communicated through the channel.
As an improvement of the piston pump with the first opening and closing sealing structure, when the driving piece drives the sealing component to move downwards to the limit position, the first sealing block abuts against the partition plate to limit the movement of the whole sealing component, when the driving piece continues to move downwards, the driving piece drives the piston component to move downwards, and the elastic ring is pressed and deformed by pressure to slide to the second clamping position along with the driving piece.
As an improvement of the piston pump with the first-opening and first-closing sealing structure, the exhaust port is always kept in a closed state during the suction process of the suction port, and the suction port is always kept in a closed state during the exhaust process of the exhaust port.
As an improvement of the piston pump with the first-opening first-closing sealing structure, the middle part of the driving piece is provided with a penetrating groove for the sealing rod to penetrate, spring grooves are symmetrically formed in two side walls of the penetrating groove, the elastic component comprises a spring arranged in the spring grooves, and the end part of the spring is provided with a ball body. When the sealing rod of the driving piece belt moves, the ball body is in butt joint with the first clamping position, when the first sealing block abuts against the partition plate, the movement of the whole sealing assembly is limited, when the driving piece continuously moves downwards, the spring is extruded by the ball body, the ball body is disconnected with the first clamping position, after the ball body is disconnected with the first clamping position, the driving piece drives the piston assembly to continuously move downwards, and when the ball body reaches the position of the second clamping position, the piston also reaches the limit position of the downward movement.
Compared with the prior art, the invention has the advantages that the invention overcomes the defect that the deformation of the one-way valve made of elastic materials has obvious hysteresis due to the self-material of the one-way valve, so that the suction inlet and the discharge outlet of the piston pump are in the opened state and the closed state before the suction operation, and the suction inlet and the discharge outlet of the piston pump are in the opened state before the discharge operation. The efficiency loss of the piston pump caused by the hysteresis problem of the one-way valve is reduced or even eliminated, so that the piston pump can operate at a higher speed.
Drawings
The invention and its advantageous technical effects are described in further detail below with reference to the attached drawings and to the detailed description, wherein:
Fig. 1 is a schematic diagram of the overall explosive structure of the present invention.
Fig. 2 is a schematic diagram of the piston cylinder housing structure of the present invention.
FIG. 3 is a schematic view of the seal assembly of the present invention.
Fig. 4 is a schematic view of the piston assembly of the present invention.
Fig. 5 is a schematic structural view of a first embodiment of the driving member of the present invention.
Fig. 6 is an initial state diagram of the piston pump of the present invention.
Fig. 7 is a state diagram of a piston pump of the present invention in which suction of a medium is started.
Fig. 8 is a state diagram of the piston pump of the present invention for completing the suction of the medium.
Fig. 9 is a state diagram of the piston pump of the present invention in which the discharge of the medium is started.
Fig. 10 is a schematic structural view of a second embodiment of the driving member of the present invention.
Fig. 11 is a schematic structural view of a second embodiment of the present invention.
Reference numeral name:
1. A piston cylinder housing;
2. 21, a baffle 22, a stop block 23, a channel 24 and a middle hole;
3. 31, a sealing rod 32, a first sealing block 33, a second sealing block 34, a first clamping position 35 and a second clamping position;
4. 41, a piston rod 42, a piston 43, a limit groove 44 and a through hole;
5. 51, a containing groove 52, a penetrating groove 53, an annular groove 54, an upper end limiting part 55 and a spring groove;
6. a suction inlet;
7. a discharge port;
8. An elastic ring;
9. elastic component 91, spring 92 and ball body.
Detailed Description
The invention will be further described with reference to the drawings and specific examples, to which embodiments of the invention are not limited.
As shown in fig. 1-9, a piston pump with a first-open and first-close sealing structure comprises a piston cylinder shell 1, wherein a cavity is arranged in the piston cylinder shell 1, a sealing component 3 and a piston component 4 are arranged in the cavity 2 in a penetrating manner, a driving piece 5 is further arranged in the cavity 2, and the driving piece 5 can drive the sealing component 3 to move to an extreme position firstly and then drive the piston component 4 to move;
The downward movement of the sealing assembly 3 and the piston assembly 4 is the suction process of the cavity 2, the upward movement of the sealing assembly 3 and the piston assembly 4 is the exhaust process of the cavity 2.
Preferably, the end of the piston cylinder housing 1 is provided with a suction port 6, one side of the piston cylinder housing 1 is provided with a discharge port 7, the sealing assembly 3 is in an initial state of sealing the suction port 6, and the discharge port 7 is in a closed state when the sealing assembly 3 is driven by the driving member 5 to open the suction port 6.
The driving member 5 is a connection assembly of an external power unit (not shown in the drawings) generating a linear reciprocating motion and a piston pump, and functions to transmit the external linear reciprocating motion to the piston through a piston rod.
Preferably, when the driving member 5 drives the sealing assembly 3 to move to be separated from the suction port 6, the piston assembly 4 is fixed, the suction port 6 is opened, and the discharge port 7 is closed.
Preferably, when the driving member 5 drives the sealing assembly 3 to move to the limit position, the driving member 5 is disconnected from the sealing assembly 3, the driving member 5 continues to move downwards and drives the piston assembly 4 to move together, the suction inlet 6 is communicated with the cavity 2, and the cavity 2 is in a suction state.
Preferably, the driving member 5 moves upwards and drives the sealing assembly 3 to move upwards together until the suction inlet 6 is sealed, the suction inlet 6 is closed, the discharge outlet 7 is opened, the driving member 5 continues to move upwards and drives the piston assembly 4 to move upwards, and the cavity 2 is in an exhaust state.
Preferably, the sealing assembly 3 comprises a sealing rod 31, a first sealing block 32 and a second sealing block 33 are arranged at one end of the sealing rod 31 at intervals, two clamping positions are arranged at the other end of the sealing rod 31 at intervals, when the sealing assembly 3 is in an initial state, the driving piece 5 is connected to the first clamping position 34 through the elastic ring 8 or the elastic assembly 9, when the driving piece 5 drives the sealing assembly 3 to move to a limit position, the driving piece 5 is disconnected with the first clamping position 34, and when the driving piece 5 drives the piston assembly 4 to move continuously, the driving piece 5 drives the elastic ring 8 or the elastic assembly 9 to slide to the second clamping position 35;
the second sealing block 33 seals the discharge port 7 during suction of the suction port 6, and the first sealing block 32 seals the suction port 6 during discharge of the discharge port 7.
Preferably, the piston assembly 4 comprises a piston rod 41, a piston 42 is sleeved at the upper end of the piston rod 41, a limiting groove 43 is formed at the lower end of the piston rod 41, the driving piece 5 can move up and down in the limiting groove 43, the lower end of the sealing rod 31 is arranged on the piston rod 41 and the driving piece 5 in a penetrating manner, the lower end of the piston rod 41 is arranged on the driving piece 5 in a penetrating manner, and an accommodating groove 51 matched with the limiting groove 43 is formed at the upper part of the driving piece 5. The piston rod 41 is provided at its center with a through hole 44 for mounting the sealing rod 31, and the sealing rod 31 is relatively movable within the through hole 44.
Preferably, the cavity 2 is internally provided with a baffle 21, the upper end of the sealing rod 31 is penetrated and arranged on the baffle 21, the baffle 21 is positioned between the first sealing block 32 and the second sealing block 33, one end of the baffle 21 is provided with a stop block 22, the stop block 22 and the side wall of the cavity 2 form an air inlet channel 23, the baffle 21 separates the cavity 2 to form an air inlet cavity and an air collecting cavity, and the air inlet cavity and the air collecting cavity are communicated through the channel 23. The middle part of the baffle 21 is provided with a middle hole 24, the middle hole 24 is provided with a sealing rod 31 in a penetrating way, and the sealing rod 31 can relatively move up and down on the middle hole 24.
Preferably, when the driving member 5 drives the sealing assembly 3 to move downwards to the limit position, the first sealing block 32 abuts against the partition 21 to limit the movement of the whole sealing assembly 3, and when the driving member 5 continues to move downwards, the driving member 4 is driven to move downwards, and the elastic ring 8 is pressed and deformed by pressure to slide to the position of the second clamping position 35 along with the driving member 5.
The middle part of the driving piece 5 is provided with a penetrating groove 52 for the sealing rod 31 to penetrate, the side wall of the penetrating groove 52 is provided with an annular groove 53 which is matched with the clamping position to fix the elastic ring 8, and the opening position of the accommodating groove 51 is provided with an upper end limiting part 54.
Preferably, the discharge port 7 is kept closed all the time during the suction of the suction port 6, and the suction port 6 is kept closed all the time during the discharge of the discharge port 7.
Second embodiment as shown in fig. 10 and 11, the difference in this embodiment is that an elastic member 9 is provided on the driving member, and the process of sucking and exhausting air is the same as that of the first embodiment. Specifically, a penetrating groove 52 through which the sealing rod 31 penetrates is formed in the middle of the driving member 5, spring grooves 55 are symmetrically formed in two side walls of the penetrating groove 52, the elastic component 9 comprises a spring 91 arranged in the spring grooves 55, and a ball 92 is arranged at the end of the spring 91. When the sealing rod 31 of the driving member 5 moves, the ball 92 is firstly abutted with the first clamping position 34, when the first sealing block 32 abuts against the partition plate 21, the movement of the whole sealing assembly 3 is limited, when the driving member 5 continues to move downwards, the spring 91 is extruded by the ball 92, the ball 92 is disconnected with the first clamping position 34, after the ball 92 is disconnected with the first clamping position 34, the driving member 5 drives the piston assembly 4 to move downwards continuously, and when the ball 92 reaches the position of the second clamping position 35, a limiting effect is formed between the ball 92 and the second clamping position 35, and the piston also reaches the limiting position of the downward movement.
The invention has the following three states:
(1) In the initial state, the first sealing block 32 is used for blocking the suction inlet 6, the limiting groove 43 of the piston rod 41 is attached to the lower limiting part of the accommodating groove 51 of the driving piece 5, and the elastic ring 8 in the driving piece 5 is clamped into the first clamping position 34 of the sealing rod 31.
(2) The suction state is that when the driving piece 5 moves linearly downwards under the action of the external linear reciprocating power device, the elastic ring 8 is clamped into the first clamping position 34 of the sealing rod 31, so that the driving piece 5 can drive the sealing assembly 3 to move linearly downwards, the piston assembly 4 keeps static, when the first sealing block 32 is attached to the partition plate 21 on one side of the suction port 6, the first sealing block 32 is limited and cannot move continuously backwards, the suction port 6 is opened, the discharge port 7 is blocked by the second sealing block 33, the driving piece 5 moves linearly downwards under the action of the external linear reciprocating power device, the elastic ring 8 is extruded to deform, and is separated from the first clamping position 34, when the upper limiting part in the accommodating groove 51 of the driving piece 5 is attached to the lower limiting part of the piston rod 41, the driving piece 5 drives the piston rod 41 to move linearly downwards, and the piston pump starts sucking medium from the suction port 6 and conveys the medium to the piston cavity through the connecting channel, and the elastic ring 8 of the driving piece 5 moves continuously downwards through the second clamping position 35.
(3) The air exhausting state is that when the driving piece 5 reaches the maximum downward movement position under the action of the external linear reciprocating movement power device, the external linear reciprocating movement power device is immediately converted into upward linear movement, when the elastic ring 8 of the driving piece 5 is clamped into the second clamping position 35, the driving piece 5 drives the sealing component 3 to move upwards linearly, the piston rod 41 is kept stationary, when the first sealing block 32 plugs the air inlet 6, the second sealing block 33 is far away from the air outlet 7, namely the air outlet 7, at the moment, the first sealing block 32 reaches the limiting position and cannot continue upward linear movement, the driving piece 5 continues upward linear movement under the action of the external linear reciprocating movement power device, the elastic ring 8 is extruded to deform and is separated from the second clamping position 35, when the upper end limiting part in the accommodating groove 51 of the driving piece 5 is attached to the upper movement limiting part of the piston rod 41, the driving piece 5 drives the piston rod 41 to move upwards linearly, at the moment, the piston pump starts to discharge media in the piston cavity from the air outlet 7, the driving piece 5 moves upwards linearly, the elastic ring 8 is clamped into the first clamping position 34, and the driving piece 5 returns to the maximum upward movement position of the initial piston pump.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made therein without departing from the principles and structure of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250422.XA CN111336096B (en) | 2020-04-01 | 2020-04-01 | Piston pump with first opening and then closing sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250422.XA CN111336096B (en) | 2020-04-01 | 2020-04-01 | Piston pump with first opening and then closing sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111336096A CN111336096A (en) | 2020-06-26 |
| CN111336096B true CN111336096B (en) | 2025-01-17 |
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ID=71184406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010250422.XA Active CN111336096B (en) | 2020-04-01 | 2020-04-01 | Piston pump with first opening and then closing sealing structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN111336096B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212296784U (en) * | 2020-04-01 | 2021-01-05 | 东莞力嘉塑料制品有限公司 | Piston pump with seal structure of closing earlier opens |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8256538B1 (en) * | 2011-11-10 | 2012-09-04 | John Mayn Deslierres | Containment system for oil field riser pipes |
| CN205207777U (en) * | 2015-12-15 | 2016-05-04 | 福建西河卫浴科技有限公司 | Shunt valve is switched in guide's piston water route |
| CN106949246B (en) * | 2017-03-01 | 2019-01-01 | 浙江大学 | A kind of pneumatic pilot-operated type variable gas distribution structure of high-speed large-flow |
| CN206668524U (en) * | 2017-03-05 | 2017-11-24 | 西南石油大学 | Hydraulic piston pump |
| CN115355213A (en) * | 2022-07-28 | 2022-11-18 | 中国石油大学(华东) | Pilot valve suitable for natural gas compressor unit |
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2020
- 2020-04-01 CN CN202010250422.XA patent/CN111336096B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212296784U (en) * | 2020-04-01 | 2021-01-05 | 东莞力嘉塑料制品有限公司 | Piston pump with seal structure of closing earlier opens |
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| CN111336096A (en) | 2020-06-26 |
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