CN218376665U - Rotating speed following piston structure - Google Patents
Rotating speed following piston structure Download PDFInfo
- Publication number
- CN218376665U CN218376665U CN202222234739.1U CN202222234739U CN218376665U CN 218376665 U CN218376665 U CN 218376665U CN 202222234739 U CN202222234739 U CN 202222234739U CN 218376665 U CN218376665 U CN 218376665U
- Authority
- CN
- China
- Prior art keywords
- oil
- piston
- brake
- piston rod
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Actuator (AREA)
Abstract
The application relates to a piston structure is followed to rotational speed includes: the oil pump comprises an outer bushing, an oil pump body and a pump body, wherein the outer bushing is of a hollow pipe body structure, and a first oil inlet hole and a second oil inlet hole are formed in the side wall of the outer bushing; a piston rod slidably connected within the outer bushing and dividing the outer bushing into a first oil chamber communicating with the first oil inlet and a second oil chamber communicating with the second oil inlet; and one end of the brake rod is positioned in the second oil cavity and is in sliding connection with the outer bushing, and the other end of the brake rod is provided with a brake oil cavity for pushing the brake rod to compress the piston rod. According to the oil supply control device, under the automatic oil supply mode, the piston rod moves in a telescopic mode according to the change of the oil pressure difference between the first oil cavity and the second oil cavity, and the oil supply amount is automatically adjusted. In the manual oil supply mode, the oil pressure of the first oil cavity is smaller than the oil pressure of the second oil cavity, the brake oil cavity pushes the brake rod to tightly press the piston rod, the piston rod cannot contract due to the reduction of the oil pressure of the first oil cavity, and the limited change of the power of the engine during the conversion of the oil supply mode is ensured.
Description
Technical Field
The application relates to the field of engine fuel regulators, in particular to a rotating speed following piston structure.
Background
When the oil supply quantity is regulated by the existing aircraft engine mechanical hydraulic fuel oil control system, the control system generally regulates the oil supply quantity in an open loop mode according to parameters such as the rotating speed of an engine, the inlet temperature, a high-pressure compressor and the like, and can regulate the oil supply quantity according to an automatic oil supply mode and a manual oil supply mode of the engine. The existing mechanical hydraulic fuel control system cannot stably adjust the fuel supply quantity after switching between an automatic fuel supply mode and a manual fuel supply mode, so that the power change of an engine is large when the modes are switched.
Disclosure of Invention
The embodiment of the application provides a piston structure is followed to rotational speed to solve the mechanical hydraulic type fuel control system among the prior art and can not stably adjust the fuel feeding volume after automatic fuel feeding mode and manual fuel feeding mode switch, lead to the big problem of power variation when the mode conversion of engine.
The embodiment of the application provides a piston structure is followed to rotational speed, includes:
the oil pump comprises an outer bushing, a first oil inlet and a second oil inlet, wherein the outer bushing is of a hollow pipe body structure, and the side wall of the outer bushing is provided with the first oil inlet and the second oil inlet;
the piston rod is connected in the outer bushing in a sliding mode and divides the outer bushing into a first oil cavity communicated with the first oil inlet hole and a second oil cavity communicated with the second oil inlet hole;
and one end of the brake rod is positioned in the second oil cavity and is in sliding connection with the outer bushing, and the other end of the brake rod is provided with a brake oil cavity for pushing the brake rod to tightly press the piston rod.
In some embodiments: one end of the piston rod extends out of the outer bushing, one end, far away from the piston rod, of the outer bushing is connected with a piston blanking cover, and a limiting mechanism for limiting the extending length of the piston rod is arranged on the piston blanking cover.
In some embodiments: the limiting mechanism comprises an adjusting sleeve in threaded connection with the piston plug cover, a bolt in threaded connection with the piston rod is connected in the adjusting sleeve in a sliding mode, and an annular retaining ring for limiting the bolt to slide towards the direction of the piston rod is arranged at one end, close to the piston rod, of the adjusting sleeve.
In some embodiments: the piston plug cover is provided with a through hole for extending the limiting mechanism into the outer bushing, one end of the piston plug cover, which is far away from the outer bushing, is provided with a plug for plugging the through hole, and the plug is connected with the piston plug cover through threads.
In some embodiments: the outer bushing and the piston blanking cover are sleeved with a shell, a plurality of first sealing rings connected with the shell in a sealing mode are arranged on the piston blanking cover and the outer bushing (6), and the first sealing rings separate a first oil inlet hole from a second oil inlet hole.
In some embodiments: the shell is provided with a mounting hole extending into the brake rod, the side wall of the brake rod is in sealing connection with the mounting hole through a second sealing ring, and the second sealing ring is used for separating the brake oil cavity from the second oil cavity.
In some embodiments: and the outer wall of the piston blanking cover is provided with a flange connected with the shell, and the shell is fixedly connected with the flange through screws.
In some embodiments: the brake rod is of a step-shaped structure with one end having a large sectional area and the other end having a small sectional area, and the end with the small sectional area of the brake rod is located in the second oil cavity.
In some embodiments: the piston rod is located one end in the outer bush and is equipped with the slider with outer bush sliding connection, be equipped with the third sealing washer with outer bush sealing connection on the slider, the tip of outer bush is equipped with the fourth sealing washer with piston rod sliding sealing connection.
In some embodiments: the outer bushing, the piston rod and the brake rod are all made of aluminum alloy materials.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a rotating speed following piston structure, and the rotating speed following piston structure is provided with an outer bushing which is a hollow pipe body structure, and a first oil inlet hole and a second oil inlet hole are formed in the side wall of the outer bushing; a piston rod slidably connected within the outer bushing and dividing the outer bushing into a first oil chamber communicating with the first oil inlet and a second oil chamber communicating with the second oil inlet; and one end of the brake rod is positioned in the second oil cavity and is in sliding connection with the outer bushing, and the other end of the brake rod is provided with a brake oil cavity for pushing the brake rod to compress the piston rod.
Therefore, the piston rod is connected in the outer bushing in a sliding mode through the rotating speed following piston structure, under the automatic oil supply mode, the piston rod is driven to stretch and retract according to the pressure difference of oil pressure in the first oil cavity and the second oil cavity, and if the oil pressure in the first oil cavity is larger than the oil pressure in the second oil cavity, hydraulic oil in the first oil cavity pushes the piston rod to extend outwards; if the oil pressure of the first oil cavity is smaller than the oil pressure of the second oil cavity, the hydraulic oil in the second oil cavity pushes the piston rod to contract inwards, and the oil supply amount is adjusted in the automatic oil supply mode. In the manual oil supply mode, the oil pressure of the first oil cavity is smaller than the oil pressure of the second oil cavity, the brake oil cavity pushes the brake rod to compress the piston rod, the piston rod cannot shrink due to the reduction of the oil pressure of the first oil cavity, and the limited change of the power of the engine during the conversion of the oil supply mode is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present application.
Reference numerals:
1. a plug; 2. a fifth seal ring; 3. a piston plug; 4. adjusting the sleeve; 5. a first seal ring; 6. a bolt; 7. a first oil inlet hole; 8. a second oil inlet hole; 9. a third seal ring; 10. an outer liner; 11. a brake lever; 12. a second seal ring; 13. a brake oil chamber; 14. a fourth seal ring; 15. a flange; 16. an internal thread; 17. a piston rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a piston structure is followed to rotational speed, and it can solve the mechanical hydraulic type fuel control system among the prior art and can not stably adjust the fuel feeding volume after automatic fuel feeding mode and manual fuel feeding mode switch, leads to the big problem of power variation when the mode conversion of engine.
Referring to fig. 1, an embodiment of the present application provides a rotational speed following piston structure, including:
the oil pump comprises an outer bushing 10, wherein the outer bushing 10 is a hollow pipe body structure with two ends penetrating through, and a first oil inlet hole 7 and a second oil inlet hole 8 are formed in the side wall of the outer bushing 10; the aperture sizes of the first oil inlet hole 7 and the second oil inlet hole 8 are specifically set according to actual needs.
And a piston rod 17, the piston rod 17 being slidably coupled within the outer liner 10 and dividing the outer liner 10 into a first oil chamber communicating with the first oil inlet hole 7 and a second oil chamber communicating with the second oil inlet hole 8. The oil pressure in the first oil chamber is adjustable, and the oil supply amount is adjusted by adjusting the oil pressure in the first oil chamber to drive the piston rod 17 to move telescopically.
And one end of the brake rod 11 is positioned in the second oil cavity and is in sliding connection with the outer bushing 10, the other end of the brake rod 11 is provided with a brake oil cavity 13 for pushing the brake rod 11 to press the piston rod 17, and hydraulic oil in the brake oil cavity 13 drives the brake rod 11 to press the piston rod 17 so as to position the piston rod 17 at a set position and keep the oil supply quantity in a stable state.
The rotating speed following piston structure of the embodiment of the application is connected with the piston rod 17 in the outer bushing 10 in a sliding mode, under the automatic oil supply mode, the piston rod 17 is driven to move in a stretching mode according to the pressure difference of oil pressure in the first oil cavity and the second oil cavity, and if the oil pressure in the first oil cavity is larger than the oil pressure in the second oil cavity, hydraulic oil in the first oil cavity pushes the piston rod 17 to extend outwards; if the oil pressure in the first oil chamber is smaller than the oil pressure in the second oil chamber, the hydraulic oil in the second oil chamber pushes the piston rod 17 to contract inwards, and the oil supply amount is adjusted in the automatic oil supply mode.
In the manual oil supply mode, the oil pressure of the first oil cavity is smaller than the oil pressure of the second oil cavity, the hydraulic oil in the brake oil cavity 13 pushes the brake rod 11 to press the piston rod 17, the piston rod 17 cannot continuously contract due to the reduction of the oil pressure of the first oil cavity, the oil supply amount is kept in a stable state, and the limited change of the power of the engine during the conversion of the oil supply mode is ensured.
In some alternative embodiments: referring to fig. 1, the embodiment of the present application provides a rotating speed following piston structure, one end of a piston rod 17 of the rotating speed following piston structure extends outside an outer bushing 10, one end of the outer bushing 10, which is far away from the piston rod 17, is connected with a piston blanking cap 3, and the piston blanking cap 3 is provided with a limiting mechanism for limiting the extending length of the piston rod 17. The limiting mechanism comprises an adjusting sleeve 4 in threaded connection with a piston plugging cover 3, a bolt 6 in threaded connection with a piston rod 17 is connected in the adjusting sleeve 4 in a sliding mode, and an internal thread 16 in threaded connection with the bolt 6 is formed in one end of the piston rod 17. One end of the adjusting sleeve 4 close to the piston rod 17 is provided with an annular retainer ring for limiting the bolt 6 to slide towards the piston rod 17.
This application embodiment is connected with piston blanking cover 3 in the one end of piston rod 17 is kept away from to outer bush 10, and this piston blanking cover 3 is used for the one end of shutoff outer bush 10, and outer bush 10, piston blanking cover 3 and piston rod 17 enclose into confined first oil pocket jointly. A limiting mechanism for limiting the extension length of the piston rod 17 is arranged between the piston plug 3 and the piston rod 17, and the limiting mechanism can control the extension length of the piston rod 17 so as to control the range of oil supply. The adjusting sleeve 4 of the limiting mechanism is in threaded connection with the piston plugging cover 3, so that the distance between the adjusting sleeve 4 and the piston rod 17 can be adjusted, and the range of oil supply amount is further adjusted. The bolt 6 of the limiting mechanism is in threaded connection with the piston rod 17, so that the distance between the bolt 6 and the piston plug cover 3 can be adjusted, and the range of oil supply amount is adjusted.
In some alternative embodiments: referring to fig. 1, the embodiment of the present application provides a rotating speed following piston structure, a through hole for extending an adjusting sleeve 4 and a bolt 6 of a limiting mechanism into an outer bushing 10 is formed in a piston blanking cover 3 of the rotating speed following piston structure, and the adjusting sleeve 4 is in threaded connection with the through hole. And one end of the piston plug cover 3, which is far away from the outer bushing 10, is provided with a plug 1 for plugging the through hole, and the plug 1 is connected with the through hole of the piston plug cover 3 through threads. Still be equipped with fifth sealing washer 2 between end cap 1 and the piston blanking cover 3, this fifth sealing washer 2 is used for the clearance between sealed end cap 1 and the piston blanking cover 3 to prevent the hydraulic oil leakage in the first oil chamber.
In some alternative embodiments: referring to fig. 1, the present application provides a rotating speed following piston structure, where an outer casing (not shown) is sleeved on an outer liner 10 and a piston blanking cover 3 of the rotating speed following piston structure, a plurality of first sealing rings 5 hermetically connected to a casing are disposed on the piston blanking cover 3 and the outer liner 10, and the first oil inlet 7 and the second oil inlet 8 are separated from each other by the plurality of first sealing rings 5. The shell is provided with a mounting hole extending into the brake rod 11, the side wall of the brake rod 11 is hermetically connected with the mounting hole through a second sealing ring 12, and the second sealing ring 12 is used for separating a brake oil cavity 13 from a second oil cavity.
And a flange 15 connected with the shell is arranged on the outer wall of the piston blanking cover 3, and the shell is fixedly connected with the flange 15 through screws. The brake rod 11 is of a step-shaped structure with a large cross section at one end and a small cross section at the other end, the end with the small cross section of the brake rod 11 is positioned in the second oil cavity, and the end with the large cross section of the brake rod 11 is positioned in the brake oil cavity 13. When the oil pressure in the second oil cavity is greater than the oil pressure in the brake oil cavity 13, the hydraulic oil in the second oil cavity drives the brake rod 11 to move in the direction away from the piston rod 17, and when the oil pressure in the second oil cavity is equal to the oil pressure in the brake oil cavity 13, the hydraulic oil in the brake oil cavity 13 drives the brake rod 11 to press the piston rod 17, so that the piston rod 17 is positioned at a set position, and the oil supply amount is kept in a stable state.
In some alternative embodiments: referring to fig. 1, the embodiment of the present application provides a rotational speed following piston structure, where one end of a piston rod 17 of the rotational speed following piston structure, located inside an outer bushing 10, is provided with a slider slidably connected to the outer bushing 10, and the slider is coaxially connected to the piston rod 17 and is of an integrally formed structure. And a third sealing ring 9 which is connected with the outer bushing 10 in a sealing way is arranged on the sliding block, and the third sealing ring 9 is connected with the first oil cavity and the second oil cavity in a sealing way. A fourth sealing ring 14 connected with the piston rod 17 in a sliding and sealing mode is arranged at the end portion of the outer bushing 10, and the fourth sealing ring 14 prevents the second oil cavity from leaking. The outer bushing 10, the piston rod 17, the piston plug cover 3, the plug 1 and the brake lever 11 are all made of aluminum alloy materials, so that the overall weight is reduced.
Principle of operation
The embodiment of the application provides a rotating speed following piston structure, and as the rotating speed following piston structure is provided with an outer bushing 10, the outer bushing 10 is of a hollow pipe body structure, and a first oil inlet hole 7 and a second oil inlet hole 8 are formed in the side wall of the outer bushing 10; a piston rod 17, the piston rod 17 being slidably connected inside the outer liner 10 and dividing the outer liner 10 into a first oil chamber communicating with the first oil inlet hole 7 and a second oil chamber communicating with the second oil inlet hole 8; and one end of the brake rod 11 is positioned in the second oil cavity and is in sliding connection with the outer bushing 10, and the other end of the brake rod is provided with a brake oil cavity 13 for pushing the brake rod 11 to press the piston rod 17.
Therefore, the rotating speed following piston structure is connected with the piston rod 17 in the outer bushing 10 in a sliding mode, in the automatic oil supply mode, the piston rod 17 is driven to move in a stretching mode according to the pressure difference of oil pressure in the first oil cavity and the second oil cavity, and if the oil pressure in the first oil cavity is larger than the oil pressure in the second oil cavity, hydraulic oil in the first oil cavity pushes the piston rod 17 to extend outwards; if the oil pressure in the first oil chamber is smaller than the oil pressure in the second oil chamber, the hydraulic oil in the second oil chamber pushes the piston rod 17 to contract inwards, and the oil supply amount is adjusted in the automatic oil supply mode. In the manual oil supply mode, the oil pressure of the first oil cavity is smaller than the oil pressure of the second oil cavity, the hydraulic oil in the brake oil cavity 13 pushes the brake rod 11 to press the piston rod 17, the piston rod 17 cannot shrink due to the reduction of the oil pressure of the first oil cavity, and the limited change of the power of the engine during the conversion of the oil supply mode is ensured.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A rotary speed following piston structure comprising:
the oil pump comprises an outer lining (10), wherein the outer lining (10) is of a hollow pipe body structure, and a first oil inlet hole (7) and a second oil inlet hole (8) are formed in the side wall of the outer lining (10);
the piston rod (17) is connected in the outer bushing (10) in a sliding mode, and divides the outer bushing (10) into a first oil cavity communicated with the first oil inlet hole (7) and a second oil cavity communicated with the second oil inlet hole (8);
and one end of the brake rod (11) is positioned in the second oil cavity and is in sliding connection with the outer bushing (10), and the other end of the brake rod (11) is provided with a brake oil cavity (13) for pushing the brake rod (11) to compress the piston rod (17).
2. A speed follower piston structure as defined in claim 1, wherein:
one end of the piston rod (17) stretches out of the outer bushing (10), one end, far away from the piston rod (17), of the outer bushing (10) is connected with the piston blanking cover (3), and the piston blanking cover (3) is provided with a limiting mechanism for limiting the stretching length of the piston rod (17).
3. A speed follower piston structure as defined in claim 2, wherein:
stop gear includes adjusting sleeve (4) with piston blanking cover (3) threaded connection, sliding connection has bolt (6) with piston rod (17) threaded connection in adjusting sleeve (4), the one end that adjusting sleeve (4) are close to piston rod (17) is equipped with restriction bolt (6) towards piston rod (17) direction gliding annular retaining ring.
4. A speed follower piston structure as defined in claim 2, wherein:
the piston blanking cap (3) is provided with a through hole extending the limiting mechanism into the outer bushing (10), one end of the piston blanking cap (3) far away from the outer bushing (10) is provided with a plug (1) for plugging the through hole, and the plug (1) is connected with the piston blanking cap (3) through threads.
5. A speed follower piston structure as defined in claim 2, wherein:
the cover is equipped with the shell on outer bush (10) and piston blanking cover (3), be equipped with on piston blanking cover (3) and outer bush (10) a plurality of and housing seal connected's first sealing washer (5), a plurality of first sealing washer (5) separate first inlet port (7) and second inlet port (8) each other.
6. A speed follower piston structure as defined in claim 5, wherein:
the brake device is characterized in that a mounting hole extending into the brake rod (11) is formed in the shell, the side wall of the brake rod (11) is in sealing connection with the mounting hole through a second sealing ring (12), and the second sealing ring (12) is used for separating the brake oil cavity (13) and the second oil cavity.
7. A speed follower piston structure as defined in claim 5, wherein:
and a flange (15) connected with the shell is arranged on the outer wall of the piston plugging cover (3), and the shell is fixedly connected with the flange (15) through screws.
8. A speed follower piston structure as defined in claim 1, wherein:
brake pole (11) are the notch cuttype structure that one end sectional area is big and the other end sectional area is little, brake pole (11) one end that the sectional area is little is located the second oil pocket.
9. A speed follower piston structure as defined in claim 1, wherein:
the piston rod (17) is located the one end of outer bush (10) and is equipped with the slider with outer bush (10) sliding connection, be equipped with on the slider with outer bush (10) sealing connection's third sealing washer (9), the tip of outer bush (10) is equipped with fourth sealing washer (14) with piston rod (17) sliding sealing connection.
10. A speed follower piston structure as defined in claim 1, wherein:
the outer bushing (10), the piston rod (17) and the brake rod (11) are all made of aluminum alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222234739.1U CN218376665U (en) | 2022-08-24 | 2022-08-24 | Rotating speed following piston structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222234739.1U CN218376665U (en) | 2022-08-24 | 2022-08-24 | Rotating speed following piston structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218376665U true CN218376665U (en) | 2023-01-24 |
Family
ID=84968788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222234739.1U Active CN218376665U (en) | 2022-08-24 | 2022-08-24 | Rotating speed following piston structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218376665U (en) |
-
2022
- 2022-08-24 CN CN202222234739.1U patent/CN218376665U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3038458A (en) | Internal combustion engines and pistons therefor | |
| CN218376665U (en) | Rotating speed following piston structure | |
| SE519307C2 (en) | Internal combustion engine | |
| CN209557227U (en) | A kind of sealing structure of plunger pump | |
| CN205571996U (en) | Electrified main shaft ram is with split type three -section pull head hydro -cylinder | |
| CN109083762B (en) | Engine and piston device thereof | |
| CN218440012U (en) | Telescopic rotary hydraulic cylinder | |
| CN202851493U (en) | Threaded inserted type counterbalance valve | |
| CN115388178A (en) | High-pressure throttle valve for oil exploitation | |
| CN214888060U (en) | Compact height-adjustable oil cylinder and coal mining machine | |
| CN205714707U (en) | A kind of Self-controlling secondary Variable Control structure of plunger displacement pump | |
| CN218439543U (en) | Valve structure is followed to rotational speed | |
| CN218377934U (en) | Hydraulic oil cylinder of vacuum valve | |
| CN209067582U (en) | A kind of sealing piston of hydraulic cylinder device that seal clearance is variable | |
| CN208331745U (en) | A kind of engine oil pump pressure-limiting valve of pressure limiting valve plunger and the anti-clamping stagnation comprising above-mentioned plunger | |
| CN208364832U (en) | It is avoided that the pressure limiting valve plunger and engine oil pump pressure-limiting valve of clamping stagnation | |
| CN207093476U (en) | A kind of oil cylinder of adjustable decrease speed | |
| CN110107498A (en) | A kind of variable vane pump | |
| CN206036335U (en) | Self -imposed water -saving tap case of hydraulic pressure time delay | |
| CN205779562U (en) | A kind of adjustable low-voltage starts deafener | |
| CN105822536B (en) | A kind of Self-controlling secondary Variable Control structure of plunger pump | |
| CN208169131U (en) | A kind of included high voltage protective centrifugal pump | |
| CN214699369U (en) | Overflow valve for controlling inflow | |
| CN209213053U (en) | A kind of gate valve rod | |
| CN218719093U (en) | Throttle valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |