CN212273641U - Single-circulation quantitative adding valve based on intermittent pressure fluid - Google Patents
Single-circulation quantitative adding valve based on intermittent pressure fluid Download PDFInfo
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- CN212273641U CN212273641U CN202020360440.9U CN202020360440U CN212273641U CN 212273641 U CN212273641 U CN 212273641U CN 202020360440 U CN202020360440 U CN 202020360440U CN 212273641 U CN212273641 U CN 212273641U
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Abstract
本实用新型公开了一种基于间歇性有压流体的单循环定量添加阀，包括压力源通道(10)，储液器(12)以及阀体(3)，所述阀体(3)内设置有阀芯(2)；所述阀芯(2)的上，下端面分别设置有压缩腔Ⅰ(14)和压缩腔Ⅱ(11)；所述压力源通道(10)通过压力出口Ⅰ连通压缩腔Ⅰ(14)；所述压缩腔Ⅱ(11)与储液器(12)相连通；所述连通压缩腔Ⅱ(11)与储液器(12)的通道Ⅱ内设置有单向阀Ⅰ；所述单向阀Ⅰ的进油口在储液器(12)一端，出油口在压缩腔Ⅱ(11)一端；所述压缩腔Ⅱ(11)上设置有输出通道(20)。
The utility model discloses a single-cycle quantitative addition valve based on intermittent pressurized fluid, comprising a pressure source channel (10), a liquid reservoir (12) and a valve body (3), wherein the valve body (3) is provided with There is a valve core (2); the upper and lower end faces of the valve core (2) are respectively provided with a compression chamber I (14) and a compression chamber II (11); the pressure source channel (10) communicates with the compression chamber through the pressure outlet I cavity I (14); the compression cavity II (11) is communicated with the accumulator (12); a one-way valve I is provided in the passage II connecting the compression cavity II (11) and the accumulator (12) The oil inlet of the check valve I is at one end of the accumulator (12), and the oil outlet is at one end of the compression chamber II (11); the compression chamber II (11) is provided with an output channel (20).
Description
Technical Field
The utility model relates to a valve, especially a valve is added to monocycle ration based on intermittent type nature has pressure fluid.
Background
The pneumatic technology is a technology for energy transfer by taking an air compressor as a power source and compressed air as a working medium, has the characteristics of high speed, high efficiency, cleanness, safety, low cost and the like, and is very wide in application. However, the pneumatic device, as a relatively precise device, has high requirements on lubrication, and related product defects in the prior art are often related to lubrication, such as:
1. maintenance is tedious: the equipment needs to be lubricated after the screw is manually disassembled, so that the maintenance period is short and the operation is frequent;
2. the structure is complicated: when the pneumatic equipment works, the leakage phenomenon caused by rhythm exists in the interface and the pipeline, so that the oil mist cannot be effectively conveyed to a target workpiece;
3. and (3) limiting the working environment: in actual operation, it is difficult to add lubricating oil timely and locally to perform standard maintenance work;
4. the requirement on the working environment is high: oil feeding and lubrication are required according to the working cycle condition of the pneumatic equipment;
5. the real working environment is complex: the existing pneumatic lubrication equipment is harsh to the use environment, the lubrication effect of the pneumatic equipment is poor in a complex environment, the output power of the pneumatic equipment needs to be guaranteed, the operation requirement is met, the use of an air source far exceeding the rated pressure is a common method, and the pneumatic equipment is undoubtedly trapped in vicious circle in the work environment; based on the results generated by the above reasons, such as common pneumatic equipment air cannon, air pick, pneumatic angle grinder, air batch and the like, the universal service life of the pneumatic equipment air cannon, air pick, pneumatic angle grinder, air batch and the like is only 40-70% of the theoretical service life; for example, the most commonly used oil mister (for adding pneumatic lubricating oil) in the existing pneumatic equipment sucks up oil in an oil cup through pressure difference, the oil flows into an oil viewing window through a throttle valve, the oil drips from a small hole above an oil dripping device, is atomized by high-speed airflow and then flows into a pneumatic element along with the airflow, so that the lubrication of the pneumatic equipment is realized. In addition, because the pneumatic equipment, such as a wind cannon, is complex in use environment and needs to be turned frequently in the actual use process, and the oil atomizer is based on a differential pressure principle, and sucks oil in the liquid storage cavity through the siphon pipe, the installation direction of the oil atomizer is extremely strictly limited, the oil atomizer is obviously not suitable for equipment, such as the wind cannon, which needs to be turned frequently in the use process, so that the oil atomizer is often installed on air source equipment and then connected with the pneumatic equipment through a pipeline in the actual use process, and in the mode, 1, due to the intervention of the pipeline, the phenomenon of oil leakage is easily generated on a joint (or the aging state of the joint) of the pipeline; 2. due to the length of the pipe, oil mist is prone to condense on the inner wall of the pipe inside the pipe.
Based on the above current situation, in some advanced pneumatic devices, technologies such as a pneumatic system oil lubricating device disclosed in patent application No. 2016111192146, a micro-lubricating system precise lubricating pump disclosed in patent application No. 2014106103020, and a simple oil mist generator disclosed in patent application No. 2010202335651 are adopted to solve the above related problems.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a simple structure's automatic ration adds valve based on intermittent type nature presses fluidic.
In order to solve the technical problem, the utility model provides a single-circulation quantitative adding valve based on intermittent pressurized fluid, which comprises a pressure source channel, a liquid storage device and a valve body, wherein a valve core is arranged in the valve body; the upper end surface and the lower end surface of the valve core are respectively provided with a compression cavity I and a compression cavity II; the pressure source channel is communicated with the compression cavity I through a pressure outlet I; the compression cavity II is communicated with the liquid reservoir; a one-way valve I is arranged in a channel II for communicating the compression cavity II with the liquid reservoir; an oil inlet of the one-way valve I is arranged at one end of the liquid reservoir, and an oil outlet of the one-way valve I is arranged at one end of the compression cavity II; and an output channel is arranged on the compression cavity II.
As the utility model discloses an improvement of intermittent type nature pressurized fluid's single cycle ration interpolation valve: the area of the upper end face of the valve core is larger than that of the lower end face.
As the utility model discloses a further improvement of intermittent type nature based on there is fluidic single circulation ration interpolation valve of pressure: the oil injection device is characterized in that at least one output port is arranged on the output channel, and an oil injection nozzle with a pressure plug is arranged on the output port.
As the utility model discloses a further improvement of intermittent type nature based on there is fluidic single circulation ration interpolation valve of pressure: a one-way valve II is arranged at a pressure outlet II between the pressure source channel and the liquid reservoir; the air inlet of the one-way valve II is arranged at one end of the pressure source channel, and the air outlet is arranged at one end of the liquid reservoir; a hose is arranged in the liquid storage device; one end of the hose is communicated with an oil inlet of the one-way valve I, and the other end of the hose is provided with a counterweight suction head.
As the utility model discloses a further improvement of intermittent type nature based on there is fluidic single circulation ration interpolation valve of pressure: and distance adjusting devices are arranged between the valve cores of the valve body.
As the utility model discloses a further improvement of intermittent type nature based on there is fluidic single circulation ration interpolation valve of pressure: the valve core is T-shaped; a T-shaped cavity is arranged in the valve body relative to the valve core; and a pressure discharge channel is arranged on the linear structure cavity of the valve body.
As the utility model discloses a further improvement of intermittent type nature based on there is fluidic single circulation ration interpolation valve of pressure: and an elastic body is arranged on the lower side surface of the valve core.
A method for using an automatic quantitative adding valve based on intermittent pressure fluid comprises the following steps of firstly setting a use environment; secondly, setting the displacement distance of the valve core according to the use environment; and finally, inputting pressure gas through a pressure source channel, completing pressure change between the compression cavity I and the compression cavity II through the on-off of the pressure gas, and controlling the valve core to switch between the station 1 and the station 2 through the pressure change.
As the utility model discloses an improvement of automatic ration interpolation valve's use method based on intermittent type nature has pressure fluid: in the first case: when the pressure source channel outputs air pressure, on one hand, the pressure outlet II inputs the pressure into the liquid storage device, and the liquid storage device stores the pressure; meanwhile, the pressure output by the pressure outlet I acts on the valve core, and the valve core is pressed down along the valve body through the pressure; in the second case: when the pressure source channel outputs air pressure, on one hand, the pressure outlet II inputs the pressure into the liquid storage device, and the liquid storage device stores the pressure; meanwhile, the pressure output by the pressure outlet I acts on the valve core, the valve core is pressed down along the valve body through the pressure, and the spring is compressed.
As the utility model discloses a further improvement of the use method of automatic ration interpolation valve based on intermittent type nature pressure fluid: in the first case: when the pressure source channel stops outputting air pressure, on one hand, the pressure outlet II stops inputting pressure into the liquid storage device, and the liquid substance is output into the compression cavity II by the liquid storage device through pressure storage; meanwhile, the pressure outlet I does not output pressure to act on the valve core any more, and the valve core returns to the original position along the valve body through the pressure of liquid substances in the compression cavity II; in the second case: when the pressure source channel stops outputting air pressure, on one hand, the pressure outlet II stops inputting pressure into the liquid storage device, and the liquid substance is output into the compression cavity II by the liquid storage device through pressure storage; meanwhile, the pressure outlet I does not output pressure to act on the valve core any more, and the valve core returns to the original position along the valve body through the elastic force of the spring and the pressure of liquid substances in the compression cavity II.
The design idea of the utility model is that: the method is characterized in that the pressure and the pressure generated by the pressurized fluid required by the pneumatic equipment during working are intermittent, the valve core is enabled to pressurize the fluid medium in the compression cavity through the cooperation of the structure based on the generated pressure change, the pressurized fluid medium is injected onto a target workpiece through the oil mist nozzle, when the pressure and the pressure generated by the pressurized fluid required by the pneumatic equipment during working are weakened or disappeared, the pressure in the compression cavity or the reset mechanism is utilized to reversely pressurize the valve core, so that the valve core is restored to the initial position, and the aim of cleaning or lubricating the target workpiece is fulfilled by circulating the method. The structure of the valve comprises a liquid storage device and a valve body, wherein a valve core is arranged in the valve body; a compression cavity is arranged between the valve body and the valve core; the compression cavity is communicated with the liquid storage device; the compression cavity is provided with an output channel; and the upper end of the valve body is provided with a control channel.
The utility model discloses an automatic ration based on intermittent type nature has pressure fluidic adds the valve is one kind and can establishes ties at the control flow pipeline or set up the valve module structure on the work piece inner space, and it carries out relevant improvement based on the actual defect of existing equipment, main following advantage:
1. the structure is simple, and the work is completed mainly through the valve core, the oil storage cavity and the compression cavity;
2. the failure rate is low, and the relative stability is high due to fewer components;
3. the operability is strong, the current injection amount of the lubricating oil can be controlled by setting or adjusting the effective stroke of the working position of the valve core, and the amount is relatively fixed;
4. the efficiency is high, and the requirement of the equipment for long-time operation can be met by filling the liquid storage device once;
5. the volume is small, and the structure is simplified, so that the volume can be subjected to integrated miniaturization treatment, and the influence on the processing cost is small;
6. the valve assembly has strong universality, most of fluid media can be quantitatively added or controlled through the valve assembly, and applicable fluid objects are determined by materials and take small values in an allowable range;
7. the modification cost is low, the modification can be completed only by performing conventional firmware addition or structure planning on the existing equipment, and the volume advantage greatly improves the applied capacity and range of the equipment;
8. the compressed fluid can generate an atomization effect through the arrangement of the pipeline structure, so that the lubricating efficiency of the air passage is improved;
9. the automation degree is high, the response speed is high, a power source is provided through the pressure intensity, and the working state is entered along with the pressure intensity change.
10. The pneumatic device is suitable for a plurality of products, and can lubricate or clean most pneumatic equipment such as a pneumatic air gun, an air pick, a pneumatic angle grinder, an air screwdriver and the like.
The distinguishing characteristic points between the prior art are as follows:
when the elastic part in the prior art is returned, the return force is relatively small and the effect is poor; when the elastic force is strong, the resilience force is larger, but the compression force required during input is larger, so that the use effect is not ideal. And the utility model discloses a valve control accomplishes the resilience process (based on the supplementary completion of elastomeric element) through the case atress process in the valve body, reduces elastomeric element's effect by a wide margin.
Drawings
The following describes the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the main structure of the present invention;
FIG. 2 is a schematic view of another configuration of FIG. 1;
fig. 3 is a main structural schematic diagram of the housing 1 in fig. 1;
fig. 4 is a main structural schematic diagram of the valve body 3 in fig. 1;
fig. 5 is a schematic top view of the valve body 3 of fig. 1;
fig. 6 is a main structural schematic diagram of the valve cartridge 2 in fig. 1;
fig. 7 is a schematic top view of the valve cartridge 2 of fig. 1;
fig. 8 is a schematic view of another configuration of fig. 2.
Detailed Description
Embodiment 1, single-cycle quantitative adding valve based on intermittent pressurized fluid, as shown in fig. 1, includes a valve body 3, a valve core 2 is placed into the valve body 3 from top to bottom, and a space formed between the valve core 2 and the valve body 3 is a compression chamber 11; on one hand, the compression chamber 11 is connected with a reservoir 12 through a channel ii, liquid substances (including but not limited to lubricant or oil and other substances) are stored in the reservoir 12, the channel ii is controlled by a check valve, and the oil and other substances can only enter the compression chamber 11 from the reservoir 12. The compression chamber 11 is provided with an output passage 20 (the number of the output passages 20 is at least 1, and if a plurality of output passages 20 are provided, a plurality of devices can be used while being externally connected through the output passages 20), and an oil mist nozzle is provided at an output port of the output passage 20. A control channel 10 is arranged above the valve body 3, and a pressure outlet I of the control channel 10 is connected with the valve body 3 and is directly communicated with the valve core 2. A pressure outlet II is arranged on the control channel 10 and is communicated with the liquid reservoir 12, a one-way valve is arranged in the pressure outlet II, and the air flow passing through the pressure outlet II is controlled to be only input into the liquid reservoir 12 from the control channel 10; because the gas pressure of control channel 10 input is intermittent type nature input, when control channel 10 input air current, pressure export I and pressure export II are with pressure input valve body 3 and reservoir 12 simultaneously in, the liquid material of pressure export II output oppression reservoir 12 is exported to compression chamber 11 in through channel II, the pressure of pressure export I output acts on case 2, case 2 pushes down along valve body 3 through pressure, compress the space of compression chamber 11, the liquid material that holds in the compression chamber 11 is exported through outlet channel 20. A spring 21 is provided between the valve element 2 and the valve body 3, and as shown in fig. 2, once the valve element 2 is depressed, the spring 21 is compressed, and as the air flow of the control passage 10 intermittently disappears, the spring 21 is rebounded to return the valve element 2 to the original position.
In actual use (under the condition of the T-shaped valve core 2, a cavity is formed below one of the T-shaped valve cores, and the cavity is in a closed state), a pressure discharge channel 13 is arranged on the closed cavity between the T-shaped valve core 2 and the valve body 3 (the pressure discharge channel 13 discharges the cavity in the closed state, so that all cavities below the T-shaped valve core 2 cannot be in the closed state under the condition that the T-shaped valve core 2 is pressed downwards, and downward displacement of the valve core 2 cannot be hindered), and the pressure discharge channel 13 has the function of 1. lubricating liquid can be added through the pressure discharge channel 13 when the equipment is idle; 2. the pressure is released through the pressure discharge channel 13, so that the valve core 2 can move downwards (the lower end position of the valve core 2 is a compression cavity 11, the compression cavity 11 is a closed space, and a one-way valve is arranged in a connecting channel of the compression cavity 11 and the liquid storage cavity 12, so that the pressure cannot be discharged, and the pressure discharge channel 13 is required to complete the pressure discharge function).
In actual use, the distance adjusting device is arranged on the valve core 2, the distance adjusting device is arranged on the upper side of the valve core 2, the moving range of the valve core 2 can be adjusted through the arrangement of the distance adjusting device, and based on the moving range, accurate quantitative control can be carried out on oil sprayed out of the compression cavity 11. The distance adjusting device can adopt a threaded graduated scale device and is positioned at the upper end of the valve core 2, and the distance between the valve core 2 and the valve body 3 can be accurately controlled by adjusting the length of the distance adjusting device (the distance adjusting device is in an extension state, the distance obtained by the valve core 2 is shortened, and the upper end of the distance adjusting device is propped against an obstacle at the upper end of the valve core 2).
Inside valve body 3 that sets up of cavity that forms between upper cover and lower cover is provided with case 2 in the valve body 3, because this case 2's special purpose the utility model discloses in, adopt simple structure to accomplish functions such as spacing, the component mode of its function is as follows: the valve core 2 comprises an upper cylinder 21 with the bottom surface area a and a lower cylinder 22 with the bottom surface area smaller than a, and the lower bottom surface of the upper cylinder 21 and the upper bottom surface of the lower cylinder 22 are fixed along the central axes of the upper cylinder 21 and the lower cylinder 22 to form a triangle with an inverted cross section. In the valve body 3, an upper groove cavity 31 and a lower groove cavity 32 are provided which are identical in shape and size to the outer surface of the valve body 2 (the upper groove cavity 31 and the lower groove cavity 32 are large in the upper groove cavity 31 and small in the lower groove cavity 32 according to the shapes of the upper cylinder 21 and the lower cylinder 22 as shown in fig. 4 and 5), and a downward one-way stopper function is performed by the difference in size between the upper cylinder 21 and the lower cylinder 22. A compression chamber 11 is provided in the lower groove cavity 32 of the valve body 3, and the compression chamber 11 is formed by a space between the lower cylinder 22 of the valve cartridge 2 and the lower groove cavity 32.
Above shell 1 still include control channel 10 and reservoir 12, this reservoir 12 sets up in this valve body 3's downside, through the integration structure, can effectual compression the utility model discloses the volume of device. The control channel 10 intermittently increases the power for pressing down the valve element 2. In this embodiment, the control channel 10 is an outlet and an inlet, and the outlet and the inlet penetrate through the outer side wall of the housing 1 (the kinetic energy of the incoming gas); the liquid reservoir 12 and the compression cavity 11 are communicated with each other, and a one-way hydraulic valve is arranged in a channel II which communicates the liquid reservoir 12 and the compression cavity 11 with each other; the groove cavity body arranged on the valve core 2 is positioned between the compression cavity 11 and the control channel 10, an output channel 20 is arranged in the valve core 2 along the central axis of an upper cylinder 21 and a lower cylinder 22, and the output channel 20 penetrates through the valve core 2 from top to bottom and is provided with a port connected with related equipment; the upper end of the outlet channel 20 is provided with an atomising nozzle (or similar mechanism). Moreover, a liquid inlet is arranged on the liquid storage device 12 and penetrates through the outer side wall of the shell 1; the reservoir 12 and the compression chamber 11 are communicated with each other through a one-way valve.
In actual use, the method for using the single-circulation quantitative adding valve based on intermittent pressurized fluid comprises the following steps:
1. adjusting the distance adjusting device according to the current use environment, and setting the movement distance of the valve core 2;
2. the control channel 10 is connected with a control source, the control source outputs air pressure, on one hand, the pressure outlet II inputs pressure into the liquid storage device 12, and the pressure output by the pressure outlet II presses liquid substances in the liquid storage device 12 to be output into the compression cavity 11 through the channel II; meanwhile, the pressure output from the pressure outlet I acts on the valve core 2, the valve core 2 is pressed down along the valve body 3 by the pressure, the spring 21 is compressed, meanwhile, the valve core 2 compresses the space of the compression cavity 11, and the liquid substance contained in the compression cavity 11 is output through the output channel 20 (or is output along the pressure discharge channel 13 at the same time); at this time, the valve core 2 enters the station 2 from the station 1.
3. The control source stops outputting the air pressure, on one hand, the pressure outlet II stops inputting the pressure into the liquid storage device 12, and the liquid substance in the liquid storage device 12 is not output to the compression cavity 11 through the channel II; meanwhile, the pressure output by the pressure outlet I acts on the valve core 2, and the restoring force of the spring 21 acts on the bottom end of the valve core 2, so that the valve core 2 returns to the original position along the valve body 3, namely the valve core enters the station 1 from the station 2.
Through the continuous switching of control case 2 between station 1 and station 2, can export the liquid substance of sufficient to the carrier, the carrier is like the pipeline of wind big gun etc. and when the liquid substance was exported, can carry out atomizing processing with the liquid substance of export through atomizing device, on equipment such as wind big gun, can carry the pipeline of equipment with the liquid substance of atomizing through the air current in, realize like effect such as lubrication, the life of extension equipment.
Further, in the present invention, when the valve element 2 is communicated with the control passage 10, the pressure P1 of the upper end surface a of the valve element 2 is F1/a 1; the force-bearing area of a is A1, and the pressure is F1.
At this time, the compression chamber 11 is a closed space and the inside thereof is filled with liquid, and when the force receiving area of the lower end surface b of the valve body is a2, the pressure is F2, and the pressure is P2, P2 is a1/a2 × P1.
When F1 is F2, pressure P2 of spool b is a1/a2 times pressure P1 of spool a.
| A1(㎡) | P1(MPa) | F1(N)＝F2(N) | A2(㎡) | P2(MPa) |
| 9 | 0.8 | 7200000 | 1.00 | 7.20 |
| 8 | 0.8 | 6400000 | 2.00 | 3.20 |
| 7 | 0.8 | 5600000 | 3.00 | 1.87 |
| 6 | 0.8 | 4800000 | 4.00 | 1.20 |
| 5 | 0.8 | 4000000 | 5.00 | 0.80 |
| 4 | 0.8 | 3200000 | 6.00 | 0.53 |
| 3 | 0.8 | 2400000 | 7.00 | 0.34 |
| 2 | 0.8 | 1600000 | 8.00 | 0.20 |
| 1 | 0.8 | 800000 | 9.00 | 0.09 |
As can be seen from the above table, the valve realizes the value change of P2 based on the value change of A1 and A2, thereby outputting pressure values with different values.
When the object to be compressed is liquid, the flow rate of the liquid output from the output port 13, which is equal to the compression stroke cavity capacity of the compression cavity, is set to be equal to the ratio of F3:
when a1> a2, P2> P1, where the highest output pressure F3 > F1 value of the output channel 13 relative to the pressure F1 of a is a high pressure output;
when a1 is a2, P1 is P2, and when F1 is the pressure of a, the highest output pressure F3 of the output channel 13 is F1, which is a medium pressure output;
when a1< a2, P1> P2, where the highest output pressure F3 < P1 value of the output channel 13 relative to the pressure F1 of a is a low pressure output;
if the initial pressure of the liquid in the compression cavity is F4, the opening pressure of the pressure discharge port 13 is F5, when the valve core 2 is subjected to the pressure fluid pressure in the control channel 10, the valve core 2 moves downwards to be compressed, when F2 is greater than F4, the pressure discharge hole 13 is opened, and the opening pressure of the pressure discharge hole is F6, when F6 is less than or equal to F4, the pressure discharge hole 13 is in a closed state, so that the opening pressure of the F4 is changed according to the force-bearing areas of S1 and S2, and the selectable range is F5 greater than F4.
If the resilient force of the elastic member is F6, when the pressure F3 of the control channel 10 drops: when F1< P3xA2, the spool 2 moves upward (pressure reset); when F1< F3, the valve element 2 moves upward (elastic return), and when F1< F3+ (P3xA2), the valve element 2 moves upward (complex return).
Finally, it should also be noted that the above list is only one specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All the modifications which can be derived directly from the disclosure of the present invention or based on the idea of the present invention by those skilled in the art should be considered as the protection scope of the present invention as long as the technical means do not depart from the idea and main points of the present invention.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020360440.9U CN212273641U (en) | 2020-03-19 | 2020-03-19 | Single-circulation quantitative adding valve based on intermittent pressure fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020360440.9U CN212273641U (en) | 2020-03-19 | 2020-03-19 | Single-circulation quantitative adding valve based on intermittent pressure fluid |
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| CN212273641U true CN212273641U (en) | 2021-01-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118775256A (en) * | 2024-07-19 | 2024-10-15 | 珠海凌达压缩机有限公司 | Main support seat and compressor |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118775256A (en) * | 2024-07-19 | 2024-10-15 | 珠海凌达压缩机有限公司 | Main support seat and compressor |
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Granted publication date: 20210101 |