CN202673688U - Double slide valve inner volume ratio stepless regulating device of single-screw refrigerating compressor - Google Patents
Double slide valve inner volume ratio stepless regulating device of single-screw refrigerating compressor Download PDFInfo
- Publication number
- CN202673688U CN202673688U CN 201220261408 CN201220261408U CN202673688U CN 202673688 U CN202673688 U CN 202673688U CN 201220261408 CN201220261408 CN 201220261408 CN 201220261408 U CN201220261408 U CN 201220261408U CN 202673688 U CN202673688 U CN 202673688U
- Authority
- CN
- China
- Prior art keywords
- interior volume
- specific ratio
- volume specific
- guiding valve
- slide valve
- 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.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The utility model provides a double slide valve inner volume ratio stepless regulating device of a single-screw refrigerating compressor. A machine body, an air suction and exhaust end seat and end covers placed at two ends are arranged inside a machine shell. A screw rotor inside the machine body is meshed with two star wheels which are arranged symmetrically. Three parts which are a spiral groove on the screw rotor, the inner wall of the machine body and the tooth faces of the star wheels form a sealed primitive volume. The inner wall of the machine body is provided with a volume-adjusting slide valve and an inner volume ratio adjusting slide valve which are of a structure in parallel and arrayed on two sides of the screw rotor, and the volume-adjusting slide valve and the inner volume ratio adjusting slide valve are respectively connected with a driving device and an indicating device which belong to a slide valve outside the machine body through a pull rod of the volume-adjusting slide valve and a pull rod of the inner volume ratio adjusting slide valve. The inner volume ratio stepless regulating technique and the compressor energy level stepless regulating technique are fully used through the device, and accordingly the inner and outer pressure ratio of the compressor can stay the same under any environment condition and any energy level so that the performance of the compressor can keep at the optimum level.
Description
Technical field
The invention relates to a kind of compressor, and particularly a kind of single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator for the interior volume specific ratio of regulating compressor, realizes that the inner pressure ratio of compressor and outer pressure ratio equate.
Background technique
Energy-conservation and environmental protection are the directions that the refrigeration technology development will be followed all the time, and water resource heat pump be owing to can extract efficiently cooling and the heating that energy are used for building from various water sources, so now become the air conditioner refrigerating technology of main flow.
The water source heat pump units of current extensive use generally has refrigeration and heats two kinds of operating modes.Take the groundwater source heat pump as example, the evaporation/condensation temperature of cooling condition is generally got 2/34 ℃; The evaporation/condensation temperature of heating condition is generally got 3/50 ℃.And the compressor that the is applied in this occasion long-pending ratio that mostly is immobilized substance, general content is long-pending than optional 2.2 or 3.0.Will cause like this in the running of compressor, will often occurring the operating mode of overcompression and under-voltage contracting, and under-voltage contracting or overcompression all can reduce because of the isentropic efficiency of compression process and the operational efficiency of compressor is reduced, the inner pressure ratio of compressor and outer pressure ratio differ larger, and the operational efficiency of compressor and the difference of its optimum efficiency are also larger.
In addition, the double-screw refrigeration compressor that has minority system to be applied to handpiece Water Chilling Units and water source heat pump units has disposed a grade interior volume specific ratio controlling device, with the variation that reduces the compressor application environmental working condition impact on compressor efficiency, because the structural feature of double-screw compressor, its interior volume specific ratio stepless regulator is 2 guiding valve cascaded structures.Interior volume specific ratio has level to regulate can not to guarantee the inside and outside pressure ratio at the operation energy level scope inner compressor of most of operating modes and compressor to equate all the time, so this has grade interior volume specific ratio controlling device limited to the lifting effect of compressor operating efficient.
To sum up, the at present used Dan Shuan Yin bar refrigeration compressor of water resource heat pump and the handpiece Water Chilling Units heavy rain that mostly changes applied environments greatly because can not well adapt to the environmental working conditions such as water resource heat pump without interior volume specific ratio controlling device or the interior volume specific ratio controlling device that only disposes level is wanted, although it is higher in the Energy Efficiency Ratio of laboratory test to cause disposing the water source heat pump units of this compressor, but the operating energy-saving effect in reality is also not obvious, thereby has affected the popularization of this power-saving technology of water resource heat pump.
Summary of the invention
The purpose of the invention provides a kind of single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator, overcome the deficiency of above-mentioned prior art, give full play to the advantage of interior volume specific ratio Technology of stepless and compression function and Technology of stepless, make the inside and outside pressure ratio of compressor under any environmental working condition, any energy level, can both keep equal, thereby make the performance of compressor remain at optimum level.
The technological scheme of the invention: single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator, casing contains body, suction and discharge end seat and two ends end cap, a wherein screw rotor and two star-wheel engagements that are arranged symmetrically with in the body, spiral chute on the screw rotor, body inwall and spider piece flank of tooth three consist of the element volume of sealing, be provided with appearance at the body inwall and transfer guiding valve and interior volume specific ratio regulating slide valve, hold to transfer guiding valve and interior volume specific ratio regulating slide valve to adopt the parallel-connection structure parallel arrangement in the both sides of screw rotor, and hold and transfer guiding valve and interior volume specific ratio regulating slide valve respectively to transfer guiding valve pull bar and interior volume specific ratio regulating slide valve pull bar and the drive unit of the guiding valve of engine body exterior to be connected indicating device with guiding valve to be connected by holding.
The drive unit of described guiding valve adopts electromagnetic valve oil piston structure, its structure is: be provided with dividing plate in the guiding valve control oil cylinder, dividing plate is divided into two cavitys, be provided with in the cavity to hold and transfer the guiding valve piston, be provided with interior volume specific ratio regulating slide valve piston in another cavity, connecting rod on the appearance accent guiding valve piston passes dividing plate and transfers the guiding valve connecting cross beam to be connected with appearance, hold to transfer the guiding valve pull bar with hold transfer the guiding valve connecting cross beam to be connected and with appearance accent guiding valve piston on the connecting rod keeping parallelism, hold accent guiding valve pull bar and hold the connecting rod of transferring on the guiding valve piston being co-located at a side of holding accent guiding valve connecting cross beam, hold and transfer the opposite side of guiding valve connecting cross beam to be connected with the indicating device of guiding valve; Connecting rod on the interior volume specific ratio regulating slide valve piston passes dividing plate and is connected with interior volume specific ratio regulating slide valve connecting cross beam, interior volume specific ratio regulating slide valve pull bar with hold to transfer the guiding valve connecting cross beam to be connected and with interior volume specific ratio regulating slide valve piston on the connecting rod keeping parallelism, connecting rod on interior volume specific ratio regulating slide valve pull bar and the interior volume specific ratio regulating slide valve piston is co-located at and holds a side of transferring the guiding valve connecting cross beam, holds and transfers the opposite side of guiding valve connecting cross beam to be connected with the indicating device of guiding valve; Guiding valve control oil cylinder is provided with fuel feeding and oil returning tube outward, fuel feeding and oil returning tube are provided with solenoid valve, solenoid valve is connected with outer control circuit, wherein hold to recall to solenoid and hold to transfer for solenoid and be connected in parallel, the one end hold to transfer the cavity of guiding valve piston to communicate by oil supply hole with being provided with, and the other end communicates with low-pressure cavity on the body by the draining hole; Interior volume specific ratio is regulated oil return solenoid valve and interior volume specific ratio and is regulated for solenoid and be connected in parallel, and the one end communicates with the cavity that is provided with interior volume specific ratio regulating slide valve piston by oil supply hole, and the other end communicates with low-pressure cavity on the body by the draining hole.
The indicating device of described guiding valve adopts rotating coder, rotating coder comprises holding transfers rotating coder and interior volume specific ratio rotating coder, hold to transfer rotating coder and interior volume specific ratio rotating coder respectively to transfer screw rod and interior volume specific ratio adjusting color screw bar and hold accent guiding valve connecting cross beam and be connected with interior volume specific ratio regulating slide valve connecting cross beam by holding, hold and transfer rotating coder to be provided with appearance accent pointer, the interior volume specific ratio rotating coder is provided with interior volume specific ratio and regulates pointer, hold the periphery of transferring screw rod and interior volume specific ratio adjusting color screw bar and be respectively equipped with appearance accent sliding sleeve and interior volume specific ratio adjusting sliding sleeve, hold and transfer the inside of sliding sleeve and interior volume specific ratio adjusting sliding sleeve to be separately installed with Returnning spring.
The beneficial effect of the invention:
1. interior volume specific ratio stepless regulator that should list spiral shell pavilion refrigeration compressor is two pairs of guiding valve parallel-connection structures, wherein the interior volume specific ratio regulating slide valve is used for regulating the size of relief opening, hold the volume flowrate of transferring guiding valve to be used for regulating compressor, the inside and outside pressure ratio that can really realize like this compressor under any operating mode of compressor, all keep under any energy level equating, thereby so that compressor operates in the optimum efficiency state all the time;
2. adopt the screw rod structure to transfer interior volume specific ratio guiding valve and appearance the straight-line displacement of guiding valve to transform angled variation, be conducive to like this make the structure compact of compressor, stable and reliable operation;
3. adopt two angular displacement sensors, namely hold and transfer rotating coder and interior volume specific ratio rotating coder, be used for transferring the real time position of guiding valve to change into curtage signal input PLC in interior volume specific ratio guiding valve and energy level appearance, in order to carry out the computational process monitoring of compressor interior volume specific ratio and energy level, so that the interior volume specific ratio of compressor is had higher control accuracy.
Description of drawings
Fig. 1 is the structural representation of the invention.
Fig. 2 is that the A-A of Fig. 1 analyses and observe view.
Fig. 3 is the structural representation of the indicating device of guiding valve in the invention.
Fig. 4 is the working principle schematic representation of the invention.
Embodiment
As depicted in figs. 1 and 2, single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator, casing contains body 3, suction and discharge end seat and two ends end cap, wherein body 3 interior screw rotors 2 and two star-wheel engagements that are arranged symmetrically with, spiral chute on the screw rotor 2, body inwall and spider piece flank of tooth three consist of the element volume of sealing, be provided with appearance at the body inwall and transfer guiding valve 1 and interior volume specific ratio regulating slide valve 26, hold to transfer guiding valve 1 and interior volume specific ratio regulating slide valve 26 to adopt the parallel-connection structure parallel arrangements in the both sides of screw rotor 2, and hold and transfer guiding valve 1 to be connected with the interior volume specific ratio regulating slide valve respectively to be connected by holding to transfer guiding valve pull bar 7 to be connected with interior volume specific ratio regulating slide valve pull bar to be connected indicating device with guiding valve with the drive unit of the guiding valve of body 3 outsides.
The drive unit of described guiding valve adopts electromagnetic valve oil piston structure, its structure is: be provided with dividing plate 23 in the guiding valve control oil cylinder 24, dividing plate 23 is divided into two cavitys, be provided with in the cavity to hold and transfer guiding valve piston 8, be provided with interior volume specific ratio regulating slide valve piston 21 in another cavity, connecting rod on the appearance accent guiding valve piston 8 passes dividing plate 23 and transfers guiding valve connecting cross beam 14 to be connected with appearance, hold to transfer guiding valve pull bar 7 with hold transfer guiding valve connecting cross beam 14 to be connected and with appearance accent guiding valve piston 8 on the connecting rod keeping parallelism, hold accent guiding valve pull bar 7 and hold the connecting rod of transferring on the guiding valve piston 8 being co-located at a side of holding accent guiding valve connecting cross beam 14, hold and transfer the opposite side of guiding valve connecting cross beam 14 to be connected with the indicating device of guiding valve; Connecting rod on the interior volume specific ratio regulating slide valve piston 21 passes dividing plate 23 and is connected with interior volume specific ratio regulating slide valve connecting cross beam 15, interior volume specific ratio regulating slide valve pull bar 22 with hold to transfer guiding valve connecting cross beam 15 to be connected and with interior volume specific ratio regulating slide valve piston 21 on the connecting rod keeping parallelism, connecting rod on interior volume specific ratio regulating slide valve pull bar 22 and the interior volume specific ratio regulating slide valve piston 21 is co-located at and holds a side of transferring guiding valve connecting cross beam 15, holds and transfers the opposite side of guiding valve connecting cross beam 15 to be connected with the indicating device of guiding valve; Guiding valve control oil cylinder 24 outer fuel feeding and the oil returning tubes of being provided with, fuel feeding and oil returning tube are provided with solenoid valve, solenoid valve is connected with outer control circuit, wherein hold to recall to solenoid 17 and hold to transfer for solenoid 18 and be connected in parallel, the one end hold to transfer the cavity of guiding valve piston 8 to communicate by oil supply hole 16 with being provided with, and the other end communicates with low-pressure cavity on the body 3 by draining hole 25; Interior volume specific ratio is regulated oil return solenoid valve 20 and interior volume specific ratio and is regulated for solenoid 19 and be connected in parallel, and the one end communicates with the cavity that is provided with interior volume specific ratio regulating slide valve piston 21 by oil supply hole 16, and the other end communicates with low-pressure cavity on the body 3 by draining hole 25.
As shown in Figure 3, the indicating device of described guiding valve adopts rotating coder 12, rotating coder 12 comprises holding transfers rotating coder 40 and interior volume specific ratio rotating coder 44, hold transferring rotating coder 40 to be connected with the interior volume specific ratio rotating coder respectively transfers screw rod 11 to be connected with interior volume specific ratio adjusting color screw bar and to hold accent guiding valve connecting cross beam 14 and are connected with interior volume specific ratio regulating slide valve connecting cross beam and are connected by holding, hold and transfer rotating coder 40 to be provided with appearance accent pointer 41, interior volume specific ratio rotating coder 44 is provided with interior volume specific ratio and regulates pointer 43, hold the periphery of transferring screw rod 11 and interior volume specific ratio adjusting color screw bar 13 and be respectively equipped with appearance accent sliding sleeve 38 and interior volume specific ratio adjusting sliding sleeve 45, hold and transfer the inside of sliding sleeve 38 and interior volume specific ratio adjusting sliding sleeve 45 to be separately installed with Returnning spring 39, Returnning spring 46.
Working principle: as shown in Figure 4, when interior volume specific ratio regulating slide valve 26 moves to 1 '-2 ' from 1-2, changed the size of relief opening 33, can not change the compressor energy level because of the position that changes sealing helix 36 like this; Hold when transferring guiding valve 1 to move to 3 '-4 ' from 3-4, owing to only changed the size of huge system outlet valve 37, namely carry out energy level by the position that changes sealing helix 36 and regulate, thereby can not change the size of relief opening 33.When the energy level of compressor is regulated, can obtain by the adjusting of interior volume specific ratio regulating slide valve 26 positions a suitable interior volume specific ratio like this, the inner pressure ratio of compressor is equated with outer pressure ratio, thereby guarantee the efficient operation of compressor.
Claims (3)
1. single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator, it is characterized in that: casing contains body (3), suction and discharge end seat and two ends end cap, wherein the interior screw rotor of body (3) (2) meshes with two star-wheels that are arranged symmetrically with, spiral chute on the screw rotor (2), body inwall and spider piece flank of tooth three consist of the element volume of sealing, be provided with appearance at the body inwall and transfer guiding valve (1) and interior volume specific ratio regulating slide valve (26), hold to transfer guiding valve (1) and interior volume specific ratio regulating slide valve (26) to adopt the parallel-connection structure parallel arrangement in the both sides of screw rotor (2), and hold and transfer guiding valve (1) to be connected 26 with the interior volume specific ratio regulating slide valve) be connected 22 by holding accent guiding valve pull bar (7) with interior volume specific ratio regulating slide valve pull bar respectively) be connected indicating device with guiding valve with the drive unit of the guiding valve of body (3) outside and be connected.
2. a kind of single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator as claimed in claim 1, it is characterized in that, the drive unit of described guiding valve adopts electromagnetic valve oil piston structure, its structure is: be provided with dividing plate (23) in the guiding valve control oil cylinder (24), dividing plate (23) is divided into two cavitys, be provided with in the cavity to hold and transfer guiding valve piston (8), be provided with interior volume specific ratio regulating slide valve piston (21) in another cavity, connecting rod on the appearance accent guiding valve piston (8) passes dividing plate (23) and transfers guiding valve connecting cross beam (14) to be connected with appearance, hold to transfer guiding valve pull bar (7) with hold transfer guiding valve connecting cross beam (14) to be connected and with appearance accent guiding valve piston (8) on the connecting rod keeping parallelism, hold to transfer guiding valve pull bar (7) and hold the connecting rod of transferring on the guiding valve piston (8) being co-located at the side that appearance is transferred guiding valve connecting cross beam (14), hold and transfer the opposite side of guiding valve connecting cross beam (14) to be connected with the indicating device of guiding valve; Connecting rod on the interior volume specific ratio regulating slide valve piston (21) passes dividing plate (23) and is connected with interior volume specific ratio regulating slide valve connecting cross beam (15), interior volume specific ratio regulating slide valve pull bar (22) with hold to transfer guiding valve connecting cross beam (15) to be connected and with interior volume specific ratio regulating slide valve piston (21) on the connecting rod keeping parallelism, connecting rod on interior volume specific ratio regulating slide valve pull bar (22) and the interior volume specific ratio regulating slide valve piston (21) is co-located at and holds a side of transferring guiding valve connecting cross beam (15), holds and transfers the opposite side of guiding valve connecting cross beam (15) to be connected with the indicating device of guiding valve; Outer fuel feeding and the oil returning tube of being provided with of guiding valve control oil cylinder (24), fuel feeding and oil returning tube are provided with solenoid valve, solenoid valve is connected with outer control circuit, wherein hold to recall to solenoid (17) and hold to transfer for solenoid (18) and be connected in parallel, the one end hold to transfer the cavity of guiding valve piston (8) to communicate by oil supply hole (16) with being provided with, and the other end communicates with low-pressure cavity on the body (3) by draining hole (25); Interior volume specific ratio regulates oil return solenoid valve (20) and the interior volume specific ratio adjusting is connected in parallel for solenoid (19), the one end communicates with the cavity that is provided with interior volume specific ratio regulating slide valve piston (21) by oil supply hole (16), and the other end communicates with low-pressure cavity on the body (3) by draining hole (25).
3. a kind of single Spiral Lobe Refrigeration Compressor double slide valve interior volume specific ratio stepless regulator as claimed in claim 1, it is characterized in that: the indicating device of described guiding valve adopts rotating coder (12), rotating coder (12) comprises holding transfers rotating coder (40) and interior volume specific ratio rotating coder (44), appearance transfers rotating coder (40) to be connected 44 with the interior volume specific ratio rotating coder) transfer screw rod (11) to be connected 13 with interior volume specific ratio adjusting color screw bar by holding respectively) transfer guiding valve connecting cross beam (14) to be connected 15 with interior volume specific ratio regulating slide valve connecting cross beam with appearance) be connected, hold and transfer rotating coder (40) to be provided with appearance accent pointer (41), interior volume specific ratio rotating coder (44) is provided with interior volume specific ratio and regulates pointer (43), hold the periphery of transferring screw rod (11) and interior volume specific ratio adjusting color screw bar (13) and be respectively equipped with appearance accent sliding sleeve (38) and interior volume specific ratio adjusting sliding sleeve (45), hold and transfer the inside of sliding sleeve (38) and interior volume specific ratio adjusting sliding sleeve (45) to be separately installed with Returnning spring (39,46).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220261408 CN202673688U (en) | 2012-06-05 | 2012-06-05 | Double slide valve inner volume ratio stepless regulating device of single-screw refrigerating compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220261408 CN202673688U (en) | 2012-06-05 | 2012-06-05 | Double slide valve inner volume ratio stepless regulating device of single-screw refrigerating compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202673688U true CN202673688U (en) | 2013-01-16 |
Family
ID=47494595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220261408 Withdrawn - After Issue CN202673688U (en) | 2012-06-05 | 2012-06-05 | Double slide valve inner volume ratio stepless regulating device of single-screw refrigerating compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202673688U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678562A (en) * | 2012-06-05 | 2012-09-19 | 阜新金昊空压机有限公司 | Double sliding valve internal volumetric ratio stepless adjusting device for single-screw refrigeration compressor |
| CN111022325A (en) * | 2018-10-09 | 2020-04-17 | 程士坚 | Multi-stage slide valve and screw compressor with same |
| CN116928916A (en) * | 2023-09-06 | 2023-10-24 | 烟台市奥威制冷设备有限公司 | Method for automatically and efficiently adjusting internal volume ratio of screw compressor in stepless manner |
-
2012
- 2012-06-05 CN CN 201220261408 patent/CN202673688U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678562A (en) * | 2012-06-05 | 2012-09-19 | 阜新金昊空压机有限公司 | Double sliding valve internal volumetric ratio stepless adjusting device for single-screw refrigeration compressor |
| CN102678562B (en) * | 2012-06-05 | 2015-06-17 | 阜新金昊空压机有限公司 | Double sliding valve internal volumetric ratio stepless adjusting device for single-screw refrigeration compressor |
| CN111022325A (en) * | 2018-10-09 | 2020-04-17 | 程士坚 | Multi-stage slide valve and screw compressor with same |
| CN116928916A (en) * | 2023-09-06 | 2023-10-24 | 烟台市奥威制冷设备有限公司 | Method for automatically and efficiently adjusting internal volume ratio of screw compressor in stepless manner |
| CN116928916B (en) * | 2023-09-06 | 2024-02-13 | 烟台市奥威制冷设备有限公司 | Method for automatically and efficiently adjusting internal volume ratio of screw compressor in stepless manner |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | Preliminary experimental study of single screw expander prototype | |
| US9920959B2 (en) | Refrigeration device | |
| CN202673688U (en) | Double slide valve inner volume ratio stepless regulating device of single-screw refrigerating compressor | |
| CN102678562B (en) | Double sliding valve internal volumetric ratio stepless adjusting device for single-screw refrigeration compressor | |
| CN107061393B (en) | Closed model pump control hydraulic system | |
| CN201071810Y (en) | Energy and internal volume rate regulating mechanism of screw compressor | |
| CN103233778A (en) | Electronic control pneumatic motor retrofitted from piston type air compressor | |
| CN102062092B (en) | Single-stage medium-pressure single-screw air compressor | |
| CN203257684U (en) | Combination type screw compressor energy and internal volume ratio slide valve adjustment mechanism | |
| CN102979593B (en) | Left-and-right moving device of mobile rod | |
| CN104454489A (en) | Integrated compact type constant power variable device | |
| CN105485280A (en) | Power transmission mechanism and power device | |
| CN102966397B (en) | Pressure differential contact point moving system for adjusting engine valve lift | |
| CN203257685U (en) | Mechanical high-precision screw compressor energy and internal volume ratio slide valve adjustment mechanism | |
| CN203560094U (en) | Single-screw double-star-wheel water pump | |
| CN205315628U (en) | Power transmission mechanism and power device | |
| CN104847434A (en) | Intake valve lift range regulating system | |
| CN204253367U (en) | The screw rod of screw vacuum pump | |
| CN103541896A (en) | Single-screw and double-star-wheel water pump | |
| CN202301044U (en) | Screw type refrigeration compressor body for air conditioner | |
| CN203532252U (en) | Sliding vane compressor with end cover variable-displacement mechanism | |
| CN104912611A (en) | Control system of inlet valve of engine | |
| CN104847436A (en) | Mechanical multidirectional movement mechanism | |
| CN202597056U (en) | Endurance test device of piston-type refrigeration compressor | |
| CN214247828U (en) | Hydraulic system capable of stepless speed regulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130116 Effective date of abandoning: 20150617 |
|
| RGAV | Abandon patent right to avoid regrant |