A fully controlled rotary cup-type intake valve for a reciprocating compressor

Abstract

A fully controlled rotary cup-type intake valve for a reciprocating compressor, including a valve seat, a valve core, a valve stem and other components. The valve core and the valve seat both adopt an A-cup structure. The valve core and the valve stem are integrated and are fully controlled by a rotary motion drive device. According to a set program, motion instructions such as acceleration, deceleration, waiting and braking are executed and the valve is opened and closed by rotation. The rotary friction is small, the sealing performance is good, and the wear and tear can be automatically compensated for after long-term use. The flow coefficient is large and the resistance coefficient is small. The effective flow area of ​​the valve core and the valve seat is more than twice that of a conventional flat mesh intake valve. The present invention also has the characteristics of no impact and long fully open residence time, which overcomes the essential defects of existing mesh intake valves such as large resistance loss and serious valve plate impact. The present invention can achieve stepless air volume adjustment without adding any equipment. The present invention can be used for the modification of existing mesh intake valves, and can also be used as a matching intake valve for a new reciprocating compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of reciprocating piston compressors, and in particular relates to an intake valve structure of a reciprocating piston compressor. Background Art

[0002] The air valve is one of the key components of reciprocating compressors. Since the birth of reciprocating compressors three hundred years ago, its air valve structure has appeared in various structures such as annular valves, mesh valves, orifice valves, DC valves, reed valves, etc. However, no matter which structure is used, the combined force of its own elastic force and the thrust of the flowing gas is used as the driving force for the movement of the valve core, so it is called an automatic valve. The characteristic of the automatic valve is that it does not require external control. It is very valuable in the era when control technology and drive technology are very backward, and it has contributed to the birth and development of reciprocating compressors.

[0003] However, precisely because of this characteristic, which is completely independent of external manipulation, the valve core can only open when the differential pressure across the valve disc is sufficient to overcome the spring force, gas force, and the adhesion between the valve core and the valve seat. When the spring force is slightly greater than the gas thrust, the valve core will close. When the spring force and gas thrust are equal, the valve core will vibrate between open and closed. As a result, the valve core's movement exhibits defects such as delayed opening, premature closing, short full-open time, prolonged floating time of the valve core in the middle position, and prone to vibration.

[0004] In order to reduce the intensity of high-frequency impact of the valve core, the lift of the valve core has to be limited, and the effective flow area is therefore limited. Although increasing the elastic force can reduce the impact of the valve core and the lift limiter, it will lead to adverse phenomena such as shortened full-opening time of the valve, increased opening lag time and closing advance time; conversely, the impact between the valve core and the lift limiter will be intensified and the working life will be shortened.

[0005] In order for the valve core to reach the designed maximum lift, the valve clearance Mach number must be large enough, which results in an increase in the resistance loss of the valve. The above defects lead to essential defects such as a small average flow coefficient of the existing valve, a large resistance loss and failure rate of the valve itself, and the inability of the valve itself to achieve stepless adjustment of the gas volume.

[0006] In recent years, with the application of partial-stroke top-opening intake valve technology, stepless adjustment of the compressed gas volume of reciprocating compressors has been achieved. For example, Chinese patent application publication No. CN1493787A discloses a piston compressor and a method for steplessly adjusting its delivery volume, as well as Chinese patent publication No. CN1379183A discloses a disc valve for a piston compressor. Through an electro-hydraulic actuator, the pressure fork is driven to press against the intake valve disc to delay closing, thereby achieving stepless adjustment of the compressed gas volume between 10% and 100%.

[0007] However, the above-mentioned existing technology still has the following deficiencies: ①, the above-mentioned adjustment method is to insert several teeth of the pressure fork into the air flow channel of the mesh air valve and press them against the valve plate, which reduces the flow area of ​​the valve seat, produces a certain amount of additional resistance loss, and further reduces the flow coefficient; ②, regardless of hydraulic drive or electromagnetic drive, the pressure fork is driven in the form of impact and braked to stop in the form of impact. The force state of the valve plate and the pressure fork is not ideal, which not only causes impact noise but also damages the service life; ③, this one-way intervention technology on the valve plate has not improved many essential defects of the traditional mesh air valve; ④, based on the stepless air volume adjustment technology of partially opening the intake valve, due to the reduction of the actual intake volume, the intake valve is far away from the design working condition, which will have an adverse effect on the operation quality of the intake valve.

[0008] In addition, the Chinese patent application with publication number CN102220958A discloses a rotary intake valve with a T-type valve plate for a reciprocating compressor. The intake valve adopts a traditional disc-shaped flat valve plate, and the flow area is the area of ​​the opening on the valve plate, so the flow area is still relatively small; the openings of the valve plate, upper seat, and base of the intake valve are equal to the angle of the blind plate, and the sealing is poor when the valve is closed; the intake valve is provided with a thrust bearing in the center of the valve plate, which cannot achieve the purpose of reducing the friction and friction loss of the entire valve plate on the upper seat and base during the valve opening and closing process, and the overall structure does not have a wear self-compensation function.

[0009] In addition, a Chinese patent application with publication number CN104895767A discloses an elliptical spherical plug-type intake valve for a reciprocating compressor. The valve core of the intake valve has an opening and closing rotation angle of 90°. Under the actual maximum performance conditions of the existing rotary drive motor, it is only suitable for reciprocating compressors with low speeds below 150 rpm, while the vast majority of existing industrial reciprocating compressors have speeds above 200 rpm. In addition, the valve core of the intake valve itself is unbalanced relative to the rotating axis, which is prone to vibration. Summary of the Invention

[0010] In response to the problems existing in the prior art, the present invention provides a fully controlled rotary cup-type intake valve for a reciprocating compressor, which has the characteristics of large flow area, large flow coefficient, small pressure loss, no impact on the valve core when switching, small rotational friction, good sealing performance, self-compensation function for long-term wear, full control of opening and closing time, and stepless adjustment of compressed gas volume.

[0011] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a reciprocating compressor fully controlled rotary cup-type intake valve, including a valve seat, a valve core, a valve stem and a rotary motion driving device, which is characterized in that: the valve core and the valve seat both adopt an A-cup type structure, the valve core and the valve stem adopt an integrated structure, the rotary motion driving device is connected to the valve stem, and the rotary motion driving device drives the valve stem and the valve core to rotate outside the air valve, and controls the valve core and the valve seat to perform periodic valve opening and closing movements according to a preset program.

[0012] The valve seat and the valve core are nested together, the valve core is located inside the valve seat, and the valve stem passes through the center of the top of the valve seat. A plurality of trapezoidal air flow channels are provided on the peripheral walls of the valve seat and the valve core. When the valve is closed, the valve seat and the annular wall of the valve core are tightly attached together, and sealing is achieved by staggering the air flow channels. When the valve is opened, a micro-gap exists between the annular wall of the valve seat and the valve core, and the air flow channel of the valve core and the air flow channel of the valve seat are directly connected to each other.

[0013] The valve stem and valve core are driven by a rotary motion drive device outside the air valve to execute acceleration, deceleration, waiting and braking instructions. The motion cycle, frequency of the rotary drive device and the rotation angle, opening time, closing time and dwell time of the valve core are manually set by an external controller according to needs.

[0014] The valve core and the valve seat have the same cone angle, and the angle between the cone generatrix and the bottom surface is no more than 80°. The valve core and the valve seat are made of wear-resistant metal or non-metal.

[0015] The number of the valve core air flow channels and the valve seat air flow channels corresponds to the valve core rotation step. Every time the valve core rotates one step, the valve core air flow channels and the valve seat air flow channels are connected once or staggered and sealed once. As the valve core rotates gradually, the valve core air flow channels and the valve seat air flow channels are alternately switched between connection and staggered sealing.

[0016] The width between adjacent valve core airflow channels is greater than the width of the valve core airflow channels by more than 2 mm; the width between adjacent valve seat airflow channels is greater than the width of the valve seat airflow channels by more than 2 mm; the width and length of the outer end opening of the valve core airflow channel are exactly the same as the width and length of the inner end opening of the valve seat airflow channel.

[0017] The valve seat is fixed and pressed on the air valve mounting hole seat by a support bracket, and a support bracket sealing gasket is installed between the support bracket and the pressing surface of the air valve mounting hole seat. A central support is fixed at the center of the support bracket, and multiple air holes are opened on the bottom wall panel of the support bracket around the central support. When the valve is closed, the closed valve core and valve seat isolate the intake space from the cylinder space.

[0018] An upper reinforcement plate is provided on the upper surface of the top wall plate of the valve core, and a lower reinforcement plate is provided on the lower surface of the top wall plate of the valve core. The top wall plate of the valve core is clamped between the upper reinforcement plate and the lower reinforcement plate, and the upper reinforcement plate and the lower reinforcement plate are connected and fixed by fastening screws.

[0019] The external controller adopts PLC, DCS or other control equipment.

[0020] The rotary motion driving device adopts a rotary servo motor, a stepping motor or an actuator with high acceleration, high deceleration and position loop control functions.

[0021] Beneficial effects of the present invention:

[0022] The valve core and valve seat of the present invention both adopt an innovative A-cup structure. Compared with the conventional flat mesh air intake valve, the surface area and flow area are more than twice that of the conventional flat mesh air intake valve, and have the characteristics of large flow coefficient and small resistance coefficient.

[0023] After the valve is opened, the valve core air flow channel and the valve seat air flow channel are directly connected, the flow coefficient is large, the effective flow area is further increased, and the gas flow rate is low. Since the pressure loss of the intake valve is proportional to the square of the valve gap gas flow rate, the pressure loss of the rotary cup type intake valve of the present invention will be greatly reduced.

[0024] The opening and closing actions of the valve core of the present invention are directly driven by an external rotary motion drive device, which can realize acceleration, deceleration, waiting, braking and other movements. The valve core can achieve "zero-speed landing" relative to the valve seat, ensuring that the switching valve core has no impact and improving the service life of the gas valve.

[0025] Since the opening and closing actions of the valve core of the present invention are directly driven by an external rotary motion drive device, the valve can be opened and closed according to the ideal motion law, overcoming the insurmountable disadvantages of the existing mesh intake valve such as delayed opening and untimely closing, making the PV indicator diagram idealized and having a good energy-saving effect.

[0026] The movement law of the valve core of the present invention is not driven or restricted by gas force and elastic force, the residence time at the maximum opening position is increased, the average gas flow rate is reduced, and the pressure loss is further reduced.

[0027] When the rotary cup-type intake valve of the present invention is opened, the airflow pressure can cause the valve core to slightly separate from the valve seat. There is no friction at all during the valve opening process. When closing the valve, the friction force exerted on the moving valve core is much smaller than the friction force after full closure. Therefore, the friction loss is small. Since the contact surface between the valve core and the valve seat is coaxially conical, the rotating motion sealing surface is automatically ground, and long-term wear can also be automatically repaired and compensated.

[0028] The present invention can be directly used for the transformation of the existing reciprocating compressor mesh valve without changing the original installation conditions of the valve, and can also be used as a matching valve for a newly manufactured reciprocating compressor.

[0029] The present invention can be used to achieve stepless adjustment of 0-100% compression load without any additional auxiliary equipment. Compared with the existing air valve using partial stroke top opening valve core technology, the structure is simpler and there is no additional resistance loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of the fully controlled rotary cup-type intake valve for a reciprocating compressor of the present invention (valve open state);

[0031] Figure 2 Schematic diagram of the structure of the fully controlled rotary cup-type intake valve for a reciprocating compressor of the present invention (valve closed state);

[0032] Figure 3 Schematic diagram of the structure of the fully controlled rotary cup-type intake valve for a reciprocating compressor of the present invention (the valve mounting hole seat, valve cover, pressure valve cover, support bracket, central support and screw plug are not shown);

[0033] Figure 4 A side view of the valve core of the fully controlled rotary cup-type intake valve for a reciprocating compressor of the present invention;

[0034] Figure 5 A side view of the valve seat of the fully controlled rotary cup-type intake valve for a reciprocating compressor according to the present invention;

[0035] Figure 6 A top view of the support bracket and central support assembly of the fully controlled rotary cup-type intake valve for a reciprocating compressor according to the present invention;

[0036] In the figure, 1 is the valve mounting hole seat, 2 is the valve cover, 3 is the valve core, 4 is the valve seat, 5 is the valve stem, 6 is the pressure valve cover, 7 is the screw plug, 8 is the rotary motion driving device, 9 is the sliding sleeve, 10 is the support bracket sealing gasket, 11 is the bolt, 12 is the valve cover sealing gasket, 13 is the sealing ring, 14 is the sealing ring, 15 is the support bracket, 16 is the valve seat sealing gasket, 17 is the central support, 18 is the upper reinforcement plate, 19 is the lower reinforcement plate, 20 is the fastening screw, 21 is the air vent, 22 is the valve core air flow channel, 23 is the valve seat air flow channel. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1 to 6As shown, a reciprocating compressor fully controlled rotary cup-type intake valve includes a valve cover 2, a valve core 3, a valve seat 4, a valve stem 5, a pressure valve cover 6, a screw plug 7 and a rotary motion driving device 8; the valve core 3 and the valve seat 4 both adopt an A-cup structure; the valve core 3 is located at the lower part of the valve seat 4; the bottom end of the valve stem 5 is fixedly connected to the center of the valve core 3, and the top end of the valve stem 5 extends to the outside of the valve cover 2; the power output end of the rotary motion driving device 8 is fixedly connected to the top end of the valve stem 5, and the bottom end of the valve stem 5 is sleeved with a sliding sleeve 9; the valve seat 4 is located above the valve core 3, and the valve seat 4 is fixedly pressed on the valve mounting hole seat 1 by a support bracket 15, and a support bracket sealing gasket 10 is installed between the support bracket 15 and the pressing surface of the valve mounting hole seat 1. 4 and the pressing surface of the support bracket 15 is installed with a valve seat sealing gasket 16; a central support 17 is fixedly provided at the center of the support bracket 15, and the sliding sleeve 9 is fixedly installed at the top center of the central support 17; the pressure valve cover 6 is sleeved on the valve stem 5, and the pressure valve cover 6 is located above the valve seat 4, and the pressure valve cover 6 is fixedly pressed on the valve seat 4; the wire plug 7 is threadedly screwed on the valve stem 5, and the wire plug 7 is located above the pressure valve cover 6, and the wire plug 7 is fixedly installed in the center of the valve cover 2, and the valve cover 2 is fixedly mounted on the air valve mounting hole seat 1 by bolts 11, and a valve cover sealing gasket 12 is installed between the valve cover 2 and the air valve mounting hole seat 1; a sealing ring 13 is installed between the wire plug 7 and the valve cover 2, and a sealing ring 14 is installed between the wire plug 7 and the valve stem 5.

[0039] The taper angles of the valve core 3 and the valve seat 4 are the same, and the angle between the cone generatrix and the bottom surface is generally not greater than 80° to prevent self-locking. The taper of the contact surface of the valve core 3 and the valve seat 4 must be precisely the same, and the wall thickness of the valve core 3 and the valve seat 4 is designed according to the required strength and rigidity.

[0040] During the specific implementation process, the valve stem 5 and the valve core 3 can be manufactured separately and combined to form an assembly. The connection method between the two can be welding or bonding. The valve stem 5 and the valve core 3 can also be manufactured in an integrated manner to obtain an assembly. The valve stem 5 and the top wall plate of the valve core 3 are precisely perpendicular, and the axial center lines of the valve core 3 and the valve seat 4 precisely coincide.

[0041] An upper reinforcing plate 18 is provided on the upper surface of the top wall panel of the valve core 3, and a lower reinforcing plate 19 is provided on the lower surface of the top wall panel of the valve core 3. The top wall panel of the valve core 3 is clamped between the upper reinforcing plate 18 and the lower reinforcing plate 19, and the upper reinforcing plate 18 and the lower reinforcing plate 19 are connected and fixed by fastening screws 20.

[0042] During the specific implementation process, the sliding sleeve 9 can be selected from graphite copper sleeve bearings, wear-resistant metal sleeves or non-metallic sleeves.

[0043] During the specific implementation, the pressure valve cover 6 adopts a disc structure, and a limiting edge is provided on the outer periphery of the pressure valve cover 6. The pressure valve cover 6 directly covers the top wall of the valve seat 4 through the limiting edge and presses it tightly on the valve seat 4.

[0044] During the specific implementation, the support seat 15 adopts a cylindrical structure, the cylindrical wall of the support seat 15 is airtight, and a plurality of air holes 21 are provided at the bottom of the support seat 15 . The plurality of air holes 21 are located around the central support 17 .

[0045] A plurality of valve core air flow channels 22 are provided on the core body of the valve core 3 . The plurality of valve core air flow channels 22 are all isosceles trapezoidal and distributed along the circumferential direction of the core body of the valve core 3 .

[0046] In a specific implementation, the number of the valve core air flow channels 22 is 10, 12, 15 or 18.

[0047] In a specific implementation process, the technical formula for the upper and lower edge widths of the isosceles trapezoidal valve core air flow channel 22 is:

[0048]

[0049]

[0050] Wherein, a is the width of the upper edge, b is the width of the lower edge, D2 is the bottom diameter of the valve core, H is the height of the valve core, h1 is the height from the upper edge to the top of the valve core, h2 is the height from the lower edge to the bottom of the valve core, α1 is the angle between the cone generatrix of the outer wall of the valve core and the bottom surface, N is the number of valve core airflow channels, λ is the slot-to-blind ratio (the ratio of the center angle of the upper edge to the center angle of the valve wall between the adjacent valve core airflow channels, and the sum of the two center angles is 360° / N).

[0051] In a specific implementation process, the total flow area of ​​the valve core air flow channel 22 on the valve core 3 is calculated as follows:

[0052]

[0053] Where, Q is the total flow area, a is the width of the upper edge, b is the width of the lower edge, H is the height of the valve core, h1 is the height from the upper edge to the top of the valve core, h2 is the height from the lower edge to the bottom of the valve core, α1 is the angle between the cone generatrix of the outer wall of the valve core and the bottom surface, and N is the number of air flow channels in the valve core.

[0054] A plurality of valve seat air flow channels 23 are provided on the seat body of the valve seat 4 and the number is the same as the valve core air flow channels 22. The plurality of valve seat air flow channels 23 are all isosceles trapezoidal and distributed along the circumferential direction of the seat body of the valve seat 4. When the valve is opened, the valve seat air flow channels 23 are directly opposite to all the valve core air flow channels 22 on the core body of the valve core 3.

[0055] During specific implementation, the blind surface width of the valve core 3 between adjacent valve core airflow channels 22 should be at least 2 mm larger than the width of the valve core airflow channels 22 to ensure that each valve core airflow channel 22 has a sealing edge of approximately 1 mm on both sides. Similarly, the blind surface width of the valve seat 4 between adjacent valve seat airflow channels 23 should also be at least 2 mm larger than the width of the valve seat airflow channel 23 to ensure that each valve seat airflow channel 23 has a sealing edge of approximately 1 mm on both sides. The fewer valve core airflow channels 22 and valve seat airflow channels 23 designed, the larger the switching angle and flow area, but the higher the dynamic characteristics requirements of the rotary motion drive device 8.

[0056] The number of the valve core air flow channels 22 and the valve seat air flow channels 23 corresponds to the rotation step of the valve core 3. Every time the valve core 3 rotates one step, the valve core air flow channels 22 and the valve seat air flow channels 23 are connected once or staggered sealed once. As the valve core 3 gradually rotates, the valve core air flow channels 22 and the valve seat air flow channels 23 alternately switch between connection and staggered sealing.

[0057] The rotary motion driving device 8 adopts a rotary servo motor, a stepper motor or other rotary actuators with high acceleration, high deceleration and position control functions.

[0058] During the specific implementation process, the parameters such as the rotation period, frequency, step angle, opening time, closing time, and dwell time of the rotary actuator such as the rotary servo motor and the stepper motor are set. When the valve stem 5 is controlled by the rotary motion drive device 8, the valve core 3 can be driven to perform acceleration, deceleration, waiting, braking and other actions.

[0059] When the valve core air flow channel 22 of the valve core 3 is completely offset from the valve seat air flow channel 23 of the valve seat 4, the air valve is in a closed state; when the valve core air flow channel 22 of the valve core 3 is completely connected to the valve seat air flow channel 23 of the valve seat 4, the air valve is in an open state, and external gas can enter the cylinder of the compressor. At this time, the compressor enters the intake process.

[0060] When the compressor reaches the required load, the rotary motion drive device 8 will receive the valve closing instruction and drive the valve stem 5 to move. The valve core air flow channel 22 of the valve core 3 and the valve seat air flow channel 23 of the valve seat 4 are completely offset, the intake valve returns to the closed state, the gas in the cylinder stops flowing back to the inlet, and the compressor begins to compress the gas remaining in the cylinder. Then the compressor enters the exhaust process, thereby realizing stepless adjustment of the compressor gas volume.

[0061] In practice, because the contact surfaces of valve core 3 and valve seat 4 have the same taper, when the valve is closed, valve core 3 abuts valve seat 4, and valve core airflow channel 22 of valve core 3 and valve seat airflow channel 23 of valve seat 4 are completely offset and sealed against each other, resulting in the intake valve being closed. When the expansion phase in the cylinder ends, the pressure differential between the gas inside and outside valve core 3 changes from positive to zero and then to negative, causing the valve core to lift off the valve seat. This is the perfect time to open the valve, and the frictional force required to open the valve is zero. Rotational drive 8 drives valve core 3 to begin rotation, frictionlessly rotating to the fully open position.

[0062] When the piston reaches its inhalation dead center, the external controller sends a closing command to the rotary motion driver 8 in a timely manner based on the set compression load. At this point, the pressure differential between the inside and outside of the valve core 3 approaches zero, and the valve core 3 rotates with minimal friction until it closes. Once the valve core 3 closes, the pressure differential between the inside and outside of the valve core 3 increases rapidly, and the positive pressure helps to seal the valve core 3 with the valve seat 4.

[0063] During the valve opening and closing process, the direction and magnitude of the gas pressure inside and outside the valve core 3 just play the role of regulating the positive pressure between the valve core 3 and the valve seat 4, maintaining low friction or no friction.

[0064] Since the contact surfaces of the valve seat 4 and the valve core 3 have the same taper, even if wear occurs during long-term use, it will automatically compensate and maintain a good seal when the valve is closed.

[0065] The solutions in the embodiments are not intended to limit the patent protection scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention is included in the patent scope of this case.

Claims

1. A fully controlled rotary cup-type intake valve for a reciprocating compressor, comprising a valve seat, a valve core, a valve stem, and a rotary motion drive device. The valve core and valve seat both employ an A-cup structure, the valve core and valve stem employ an integrated structure, the rotary motion drive device is connected to the valve stem, and the rotary motion drive device drives the valve stem and valve core to rotate externally of the valve, controlling the valve core and valve seat to periodically open and close the valve according to a pre-set program. The valve seat and the valve core are nested together, the valve core is located inside the valve seat, the valve stem passes through the center of the top of the valve seat, and multiple trapezoidal air flow channels are opened on the peripheral walls of the valve seat and the valve core. When the valve is closed, the valve seat and the annular wall of the valve core are tightly attached together, and the sealing is achieved by staggering the air flow channels. When the valve is opened, there is a micro gap between the annular wall of the valve seat and the valve core, and the air flow channel of the valve core and the air flow channel of the valve seat are directly connected to each other; The valve core air flow channels are all isosceles trapezoidal and distributed along the circumference of the valve core body; the upper edge width a of the isosceles trapezoidal valve core air flow channels satisfies: ； The lower edge width b of the valve core air flow channel meets the following requirements: ； Where, D 2 is the bottom diameter of the valve core, H is the valve core height, h 1 It is the height from the upper edge of the valve core channel to the top of the valve core. h 2 It is the height from the lower edge of the valve core channel to the bottom of the valve core. α 1 is the taper angle of the valve core outer wall, N is the number of valve core air flow channels; λ is the slot-to-blind ratio, specifically the ratio of the center angle of the upper edge to the center angle of the valve wall between adjacent valve core airflow channels; The valve stem and valve core are driven by a rotary motion drive device outside the air valve to execute acceleration, deceleration, waiting and braking instructions. The motion cycle, frequency of the rotary motion drive device and the rotation angle, opening time, closing time and dwell time of the valve core are manually set by an external controller as needed; The contact surfaces between the valve core and the valve seat have the same taper. When the valve is closed, the valve core is in close contact with the valve seat, the air flow channel of the valve core and the air flow channel of the valve seat are completely offset and sealed with each other, and the intake valve is in a closed state. When the expansion stage in the cylinder ends, the pressure difference between the gas inside and outside the valve core changes from positive to zero and then to negative, and the valve core leaves the valve seat. At this time, it is time to open the valve. The friction force for opening the valve is zero, and the valve core starts to rotate driven by the rotary motion drive device and rotates to the fully open position without friction. When the piston reaches the suction dead point, the external controller sends a closing rotation command to the rotary motion drive device according to the set compression load. At that time, the pressure difference between the inside and outside of the valve core is zero, and the valve core rotates under a small friction force until it closes. When the valve core is closed, the pressure difference between the inside and outside of the valve core increases rapidly, and the positive pressure helps to seal the valve core and the valve seat. During the valve opening and closing process, the direction and magnitude of the gas pressure inside and outside the valve core play a role in regulating the positive pressure between the valve core and the valve seat, maintaining low friction or no friction.

2. A reciprocating compressor fully controlled rotary cup-type intake valve according to claim 1, characterized in that: The valve core and the valve seat have the same cone angle, and the angle between the cone generatrix and the bottom surface is no more than 80°. The valve core and the valve seat are made of wear-resistant metal or non-metal.

3. The fully controlled rotary cup-type intake valve for a reciprocating compressor according to claim 1, characterized in that: The number of the valve core air flow channels and the valve seat air flow channels corresponds to the valve core rotation step. Every time the valve core rotates one step, the valve core air flow channels and the valve seat air flow channels are connected once or staggered and sealed once. As the valve core rotates gradually, the valve core air flow channels and the valve seat air flow channels are alternately switched between connection and staggered sealing.

4. The fully controlled rotary cup-type intake valve for a reciprocating compressor according to claim 1, characterized in that: The width between adjacent valve core airflow channels is greater than the width of the valve core airflow channels by more than 2 mm; the width between adjacent valve seat airflow channels is greater than the width of the valve seat airflow channels by more than 2 mm; the width and length of the outer end opening of the valve core airflow channel are exactly the same as the width and length of the inner end opening of the valve seat airflow channel.

5. The fully controlled rotary cup-type intake valve for a reciprocating compressor according to claim 1, characterized in that: The valve seat is fixed and pressed on the air valve mounting hole seat by a support bracket, and a support bracket sealing gasket is installed between the support bracket and the pressing surface of the air valve mounting hole seat. A central support is fixed at the center of the support bracket, and multiple air holes are opened on the bottom wall panel of the support bracket around the central support. When the valve is closed, the closed valve core and valve seat isolate the intake space from the cylinder space.

6. The fully controlled rotary cup-type intake valve for a reciprocating compressor according to claim 1, characterized in that: An upper reinforcement plate is provided on the upper surface of the top wall plate of the valve core, and a lower reinforcement plate is provided on the lower surface of the top wall plate of the valve core. The top wall plate of the valve core is clamped between the upper reinforcement plate and the lower reinforcement plate, and the upper reinforcement plate and the lower reinforcement plate are connected and fixed by fastening screws.

7. The fully controlled rotary cup-type intake valve for a reciprocating compressor according to claim 1, characterized in that: The external controller adopts PLC, DCS or other control equipment.

8. The fully controlled rotary cup-type intake valve for a reciprocating compressor according to claim 1, characterized in that: The rotary motion driving device adopts a rotary servo motor, a stepping motor or an actuator with high acceleration, high deceleration and position loop control functions.

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