CN105402188A - Servo controllable high-speed rotating shunting reversing valve - Google Patents
Servo controllable high-speed rotating shunting reversing valve Download PDFInfo
- Publication number
- CN105402188A CN105402188A CN201510997550.XA CN201510997550A CN105402188A CN 105402188 A CN105402188 A CN 105402188A CN 201510997550 A CN201510997550 A CN 201510997550A CN 105402188 A CN105402188 A CN 105402188A
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- oil
- spool
- valve body
- valve
- hydraulic cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Servomotors (AREA)
Abstract
The invention relates to a servo controllable high-speed rotating shunting reversing valve. The servo controllable high-speed rotating shunting reversing valve comprises a valve body, a valve core and an alternating current servo motor, wherein an oil inlet, an oil return opening and eight hydraulic cylinder oil filling and return openings uniformly formed in the circumferential side wall are formed in the valve body, and an L-shaped valve core oil inlet passage is formed in the valve core. After the valve core rotates, the oil outlet of the valve core oil inlet passage can sequentially communicate with one hydraulic cylinder oil filling and return opening in the valve body. In order to meet the high-speed accurate response requirements of a hydraulic system comprising a plurality of hydraulic cylinders, the rotating speed and the starting and stop time of the alternating current servo motor connected with the valve core are regulated so as to realize the fixed-time, fixed-quantity and fixed-point accurate shunting and reversing of high-pressure liquid flow, the response is rapid, and the control is accurate. Meanwhile, under the high-speed rotating condition of the alternating current servo motor, the whole valve is sealed by a self-balance dynamic seal effect produced by multiple rows of annular seal grooves prefabricated at the periphery of the valve core, so that traditional rubber seal components are omitted, and system faults caused by invalid seal are also avoided.
Description
Technical field
The invention belongs to the adjusting control valve field of Fluid Transmission and Control technique direction, be specifically related to
the controlled high speed rotating shunt reversing valve of a kind of servo.
Background technique
For the complex hydraulic system be made up of multiple reciprocating hydraulic cylinder, in oil hydraulic circuit, the fluid of multiple piston cylinder distributes and commutation usually adopts multi-way selector valve or rotary valve to realize.Selector valve refers to the position control valve with two or more hydraulic fluid port and two or more liquid form, it utilizes different power to convert the relative position of valve body inner spool, thus realize hydraulic circuit break-make, commutate and be attached thereto sequence control and the unloading of hydraulic actuator.Selector valve can be divided into mechanical type, manually operated type, hydraulic type, electrolyte type and electromagnetic type etc. several by the power difference promoting spool, and wherein the automaticity of solenoid directional control valve is the highest, most widely used.But the commutation response time of traditional solenoid directional control valve and commutating frequency are subject to the restriction of electromagnetic technique, there is a limiting value, still requirement is can not meet far away under the application needing high-speed response, and become corresponding relation with the quantity of executive component due to the quantity of solenoid directional control valve in system circuit, a considerable number of solenoid valve not only increases complexity and the cost of system, also greatly improves the rate of fault of system simultaneously.Rotary valve, also known as rotary valve, is a kind of typical position control valve, mainly through rotary component as rotary spool controls the opening and closing of runner, to switch the flow direction of runner inner fluid.Existing rotary valve needs external rotary magnet or asynchronous motor to rotate to drive rotary spool usually, although structure is simple, compact, but controllability is poor, Sealing easily lost efficacy under high speed reciprocating rotation, therefore its product is only only applicable to the application of small flow at present.
Summary of the invention
This
inventionobject be to overcome the technical disadvantages that above-mentioned prior art exists, provide
the controlled high speed rotating shunt reversing valve of a kind of servothis selector valve utilizes the mode of the self-sealed spool of driven by servomotor high speed, not only achieve the distribution at regular time and quantity of flow, simultaneously can control external executive component to move by appointment order, having commutation response rapidly, high, the advantages such as accurately commutation, system architecture is simple, controllability good, system failure rate is low of can fixing a point at regular time and quantity of commutating frequency.
In order to achieve the above object, the technical solution of the present invention's employing is as follows:
the controlled high speed rotating shunt reversing valve of a kind of servo, comprise valve body, be set in spool in valve body and actuatable valve core pivotal AC servo motor in body cavity, wherein,
Described valve body has the cylinder hollow valve pocket that an one end is solid-end, the valve body filler opening that one is circumscribed with main oil inlet pipe is had at the center of the solid end face of valve pocket, circumferential side wall has nine hydraulic fluid ports in the middle part of valve pocket, eight hydraulic fluid ports are wherein distributed on same circumferential section, for being circumscribed with oil hydraulic cylinder feeding, the oil hydraulic cylinder feeding of rollback oil pipe, rollback hydraulic fluid port, another hydraulic fluid port is slightly being offered away from the position of oil hydraulic cylinder feeding, rollback hydraulic fluid port, for being circumscribed with the valve body return opening of main return tube;
Described spool has a cylindrical core, a L-type spool oil-feed path be made up of axial passage and radial passage is had near the end face center of main oil inlet pipe one end at spool, the filler opening of spool oil-feed path communicates with valve body filler opening, each oil hydraulic cylinder feeding on the central axis of spool oil-feed path oil outlet and valve body, the central axis of rollback hydraulic fluid port is on same circumferential section, spool outer circumferential face has twice annular oil-return groove, the oil outlet of the wherein first annular oil-return groove and spool oil-feed path and oil hydraulic cylinder feeding, rollback hydraulic fluid port is on the same cross section of spool, on the circumferential surface in 270 ° of annular spread, and the oil outlet end of its symmetrical middle section and spool oil-feed path is on the same longitudinal section of spool, the symmetrical middle section of the second annular oil-return groove and the central axis of valve body return opening are on same cross section, twice annular oil-return groove is connected by one short groove on spool periphery.
The further technical solution of the present invention is also: the annular table being provided with a circle undergauge on the inwall of body cavity close to solid end face, the filler opening end overhead of spool is on step, and the cavity between spool filler opening end and step forms the main oil suction chamber of valve body.
The further technical solution of the present invention is also: valve body return opening is connected with main return tube by screw thread, eight that in the middle part of valve pocket, circumferential side wall are opened uniform oil hydraulic cylinder feedings, rollback hydraulic fluid port are respectively fixedly connected with by the screw thread oil hydraulic cylinder feeding corresponding with, rollback oil pipe, and the other end of oil hydraulic cylinder feeding, rollback oil pipe is directly connected in feeding and the rollback hydraulic fluid port of reciprocating hydraulic cylinder.
The further technical solution of the present invention is also: on the outer circumferential face of spool, be furnished with multiple tracks annular seal groove, and the sweeping cross section of this annular seal groove is rectangle, wide 4 ~ 6mm, dark 3 ~ 5mm, and the spacing between two adjacent annular seal grooves is 4 ~ 6mm.
The further technical solution of the present invention is also: the diameter of spool oil-feed path and oil hydraulic cylinder feeding, rollback hydraulic fluid port is all less than the through-hole diameter of main oil inlet pipe and main return tube.
The further technical solution of the present invention is also: spool and AC servo motor are connected to form assembly by flat key and are installed in valve body valve pocket, and one end of AC servo motor is fixed on the end face of valve body hollow end by clamping bolt.
Compared with prior art, the controlled high speed rotating shunt reversing valve of servo of the present invention can realize shunting and the commutation of fluid, utilize this shunting reversing arrangement in conjunction with the accurate control of AC servo motor, the fixed point at regular time and quantity that can realize high pressure liquid stream is accurately shunted and commutates, and has the advantage that structure is simple, controllability strong, commutation response is rapid, commutating frequency is high; Simultaneously due to the multiple tracks annular seal groove of the spool employing rational deployment of apparatus of the present invention, under the high-speed driving of AC servo motor, high-pressure liquid is made to produce self balancing motive sealing effect, eliminate the consumption of conventional rubber Sealing completely, and the high controllability of AC servo motor also widens the application area of apparatus of the present invention greatly.
Accompanying drawing explanation
fig. 1it is the main line of vision cross-section structure signal of the present invention's specific embodiment device
figure (Fig. 4a-A illustrate to cross-section structure
figure).
fig. 2be
fig. 1overlooking of illustrated embodiment device
figure.
fig. 3be
fig. 1a left side for illustrated embodiment device is looked
figure.
fig. 4be
fig. 1the right side of illustrated embodiment device is looked
figure.
fig. 5be
fig. 4b-B illustrate to cross-section structure
figure.
fig. 6that the axle of illustrated embodiment of the present invention device is looked
figure.
fig. 7it is the working principle of illustrated embodiment of the present invention device
figure.
in figurethe title of each number designation is respectively: the main return tube of 1-, 2-valve body, 3-annular seal groove, the annular oil-return groove of 4-second, 5-AC servo motor, 6-clamping bolt, 7-first deep groove ball bearing, the feeding of 8-oil hydraulic cylinder, rollback oil pipe (wherein 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h be respectively with on valve body circumferential side wall open eight uniform oil hydraulic cylinder feedings, the oil hydraulic cylinder feeding that rollback hydraulic fluid port connects, rollback oil pipe), 9-spool oil-feed path, 10-spool, 11-second deep groove ball bearing, the main oil suction chamber of 12-, the main oil inlet pipe of 13-, 14-valve body return opening, 15-flat key, the feeding of 16-oil hydraulic cylinder, rollback hydraulic fluid port, 17-valve body filler opening, the annular oil-return groove of 18-first, 19-1 oil hydraulic cylinder, 20-2 oil hydraulic cylinder, 21-3 oil hydraulic cylinder, 22-4 oil hydraulic cylinder, 23-fuel tank, 24-oil hydraulic cylinder feeding oil circuit, 25-oil hydraulic cylinder rollback oil circuit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below with reference to
accompanying drawingembodiment of the present invention is described in further detail.
as Fig. 1-
fig. 6shown in, the controlled high speed rotating shunt reversing valve of servo of the present invention primarily of valve body 2, be set in the spool 10 in valve body 2 and form for driving spool 10 to rotate AC servo motor 5.
Valve body 2 one end is hollow, and the other end is solid, has valve body filler opening 17 at the center of its solid end face, and valve body filler opening 17 utilizes screw thread to be connected with main oil inlet pipe 13.The inwall of valve body 2 inner chamber close to solid end face is provided with the annular table of a circle undergauge, and utilize this annular table to form the main oil suction chamber 12 of valve body, annular table can fix the outer ring of the second deep groove ball bearing 11 simultaneously.Portion's circumferential side wall has nine hydraulic fluid ports in the body 2, wherein eight hydraulic fluid ports are distributed on same circumferential section, for can utilize screw thread correspondence be circumscribed with an oil hydraulic cylinder feeding, rollback oil pipe 8 (
fig. 2-
fig. 4,
fig. 6shown in 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h) oil hydraulic cylinder feeding, rollback hydraulic fluid port 16, another hydraulic fluid port is slightly being offered away from the position of oil hydraulic cylinder feeding, rollback hydraulic fluid port, is the valve body return opening 14 that screw thread can be utilized to be circumscribed with main return tube 1; The other end of oil hydraulic cylinder feeding, rollback oil pipe 8 can be connected with rollback hydraulic fluid port with the feeding of reciprocating hydraulic cylinder, realizes the to-and-fro motion of oil hydraulic cylinder.
Spool 10 utilizes the first deep groove ball bearing 7 and the second deep groove ball bearing 11 two ends to be fixedly supported in the inner chamber of valve body 2, the hard to bear AC servo motor 5 of spool 10 energy is driven in the inner chamber of valve body 2, carries out entirety revolution.In order to realize the steady circulation of high-pressure liquid, spool 10 has a L-type spool oil-feed path 9 be made up of axial passage and radial passage near the end face center of main oil inlet pipe 13 one end, in order to realize the correctly through of oil circuit, the central axis of each oil hydraulic cylinder feeding on the central axis of spool oil-feed path 9 oil outlet and valve body 2, rollback hydraulic fluid port 16 is on same circumferential section.For reducing system failure rate, the use of rubber seal is exempted in system, therefore, need system in the lower extra generation self balancing motive sealing effect that runs up, therefore on the outer circumferential face of spool 10, being furnished with multiple tracks annular seal groove 3, its sweeping cross section is rectangular cross-section, wide 4 ~ 6mm, dark 3 ~ 5mm, the spacing between two adjacent annular seal grooves 3 is 4 ~ 6mm.Simultaneously, for realizing single oil circuit oil-feed, the quick oil return function of all the other oil circuits, the outer circumferential face of spool 10 is also provided with twice annular oil-return groove 4,18, wherein first annular oil-return groove 18 is on same cross section with the oil outlet end of spool oil-feed path 9, on the circumferential surface in 270 ° of annular spread (see
fig. 7), and the oil outlet end of symmetrical middle section and spool oil-feed path 9 is on the same longitudinal section of spool 10, second annular oil-return groove 4 is on same cross section with valve body return opening 14, and twice annular oil-return groove is connected by one short groove on spool 10 periphery.Spool 10 utilizes flat key 15 to be connected with AC servo motor 5 away from one end of main oil suction chamber 12, and utilizes four clamping bolts 6 to be fixedly installed on the hollow end end face of valve body 2.
For making system oil-feed and oil return steady rapidly, in the present invention, the through-hole diameter of main oil inlet pipe 13, main return tube 1 is all greater than the through-hole diameter of spool in-line 9 and oil hydraulic cylinder feeding, rollback oil pipe 8.
The controlled high speed rotating shunt reversing valve of servo of the present invention can be applied in the hydraulic system with four reciprocating hydraulic cylinders, existing be applied to control four oil hydraulic cylinder for this selector valve and carry out reciprocatory motion in certain sequence and be illustrated, its working procedure
as Fig. 7shown in:
By be connected on valve body filler opening 17 main oil inlet pipe 13 (see
fig. 7center spool) be connected to oil hydraulic pump and relevant required hydraulic element, open oil hydraulic pump, under the driving of oil hydraulic pump, fluid enters main oil suction chamber 12 through fuel tank 23 through main oil inlet pipe 13; Open AC servo motor 5 simultaneously, under the drive of AC servo motor 5, spool 10 by starting counterclockwise to rotate, when the oil outlet of spool oil-feed path 9 go to the filler opening of on valve body 2 (
as Fig. 7the shown filler opening be connected with oil hydraulic cylinder feeding, rollback oil pipe 8h) when communicating, AC servo motor 5 stops operating, No. 4 oil hydraulic cylinder 22 feeding chamber oil-feeds, piston rod starts to exert oneself, and all the other seven filler openings all carry out quick oil return by annular oil-return groove 4 through main return tube 14 and secondary return tube 1; After oil-feed, AC servo motor 5 is rotated further, when go to on valve body 2 another filler opening (
as Fig. 7the shown filler opening be connected with oil hydraulic cylinder feeding, rollback oil pipe 8g) when communicating, AC servo motor 5 stops operating again, the rollback chamber oil-feed of No. 4 oil hydraulic cylinders 22, piston rod rollback.By that analogy, system can carry out oil-feed and oil return by the order of No. 4 oil hydraulic cylinders 22 → No. 3 oil hydraulic cylinders 21 → No. 2 oil hydraulic cylinders 20 → No. 1 oil hydraulic cylinders 19 to each oil hydraulic cylinder; Equally, as long as change rotating speed and the endurance of AC servo motor 5, also can by oil-feed and the oil return of specifying oil hydraulic cylinder order to carry out each oil hydraulic cylinder, in addition, in continuous operation, the oil inlet quantity of each oil hydraulic cylinder and oil-feed order can control at any time.
To sum up content, the controlled high speed rotating shunt reversing valve of servo of the present invention can for the requirement accurately responded at a high speed containing multi-hydraulic-cylinder complex hydraulic system, by adjusting rotating speed and the start-stop time of the AC servo motor be connected with spool, the fixed point at regular time and quantity realizing high pressure liquid stream is accurately shunted and commutates, response is rapid, precise control; Simultaneously, under the high speed rotating of AC servo motor, the self balancing motive sealing effect that the multiple tracks annular seal groove utilizing spool periphery prefabricated produces seals whole valve, has both eliminated the consumption of conventional rubber Sealing, turn avoid the fault that system causes because of seal failure.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the controlled high speed rotating shunt reversing valve of servo, comprise valve body (2), be set in spool (10) in valve body (2) and actuatable valve core (10) pivotal AC servo motor (5) in valve body (2) inner chamber, it is characterized in that:
Described valve body (2) has the cylinder hollow valve pocket that an one end is solid-end, the valve body filler opening (17) that one is circumscribed with main oil inlet pipe (13) is had at the center of the solid end face of valve pocket, circumferential side wall has nine hydraulic fluid ports in the middle part of valve pocket, wherein eight hydraulic fluid ports are distributed on same circumferential section, for being circumscribed with oil hydraulic cylinder feeding, the oil hydraulic cylinder feeding of rollback oil pipe (8), rollback hydraulic fluid port (16), another hydraulic fluid port is slightly away from oil hydraulic cylinder feeding, the position of rollback hydraulic fluid port is offered, for being circumscribed with the valve body return opening (14) of main return tube (1),
Described spool (10) has a cylindrical core, L-type spool oil-feed path (9) be made up of axial passage and radial passage is had near the end face center of main oil inlet pipe (13) one end at spool (10), the filler opening of spool oil-feed path (9) communicates with valve body filler opening (17), the central axis of spool oil-feed path (9) oil outlet and the upper each oil hydraulic cylinder feeding of valve body (2), the central axis of rollback hydraulic fluid port (16) is on same circumferential section, spool (10) outer circumferential face has twice annular oil-return groove (4, 18), the oil outlet of the wherein first annular oil-return groove (18) and spool oil-feed path (9) and oil hydraulic cylinder feeding, rollback hydraulic fluid port (16) is on the same cross section of spool (10), on the circumferential surface in 270 ° of annular spread, and the oil outlet end of its symmetrical middle section and spool oil-feed path (9) is on the same longitudinal section of spool (10), the symmetrical middle section of the second annular oil-return groove (4) and the central axis of valve body return opening (14) are on same cross section, twice annular oil-return groove (4, 18) connected by one short groove on spool (10) periphery.
2. the controlled high speed rotating shunt reversing valve of servo according to claim 1, it is characterized in that: the annular table being provided with a circle undergauge on the inwall of valve body (2) inner chamber close to solid end face, the filler opening end overhead of spool (10) is on step, and the cavity between spool (10) filler opening end and step forms the main oil suction chamber (12) of valve body.
3. the controlled high speed rotating shunt reversing valve of servo according to claim 1, it is characterized in that: described valve body return opening (14) is connected with main return tube (1) by screw thread, eight that in the middle part of valve pocket, circumferential side wall are opened uniform oil hydraulic cylinder feedings, rollback hydraulic fluid port (16) are respectively fixedly connected with by the screw thread oil hydraulic cylinder feeding corresponding with, rollback oil pipe (8), and the other end of oil hydraulic cylinder feeding, rollback oil pipe (8) is directly connected in feeding and the rollback hydraulic fluid port of reciprocating hydraulic cylinder.
4. the controlled high speed rotating shunt reversing valve of servo according to claim 1, it is characterized in that: on the outer circumferential face of spool (10), be furnished with multiple tracks annular seal groove (3), the sweeping cross section of described annular seal groove (3) is rectangle, wide 4 ~ 6mm, dark 3 ~ 5mm, the spacing between two adjacent annular seal grooves (3) is 4 ~ 6mm.
5. the controlled high speed rotating shunt reversing valve of servo according to claim 1, is characterized in that: the diameter of described spool oil-feed path (9) and oil hydraulic cylinder feeding, rollback hydraulic fluid port (16) is all less than the through-hole diameter of main oil inlet pipe (13) and main return tube (1).
6. the controlled high speed rotating shunt reversing valve of servo according to claim 1, it is characterized in that: described spool (10) and AC servo motor (5) are connected to form assembly by flat key (15) and are installed in valve body (2) valve pocket, one end of AC servo motor (5) is fixed on the end face of valve body (2) hollow end by clamping bolt (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510997550.XA CN105402188B (en) | 2015-12-28 | 2015-12-28 | A kind of controllable high-speed rotation shunt reversing valve of servo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510997550.XA CN105402188B (en) | 2015-12-28 | 2015-12-28 | A kind of controllable high-speed rotation shunt reversing valve of servo |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105402188A true CN105402188A (en) | 2016-03-16 |
| CN105402188B CN105402188B (en) | 2017-08-29 |
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|---|---|---|---|
| CN201510997550.XA Expired - Fee Related CN105402188B (en) | 2015-12-28 | 2015-12-28 | A kind of controllable high-speed rotation shunt reversing valve of servo |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971958A (en) * | 2016-06-12 | 2016-09-28 | 山东嘉岩石油科技开发有限公司 | Two-position four-way rotating reversing valve |
| CN107008840A (en) * | 2017-05-27 | 2017-08-04 | 江苏德生新材料锻造有限公司 | Hydraulic rapid forging press |
| CN107084168A (en) * | 2017-05-27 | 2017-08-22 | 江苏德生新材料锻造有限公司 | A kind of hydraulic reversing valve |
| CN107442491A (en) * | 2017-09-12 | 2017-12-08 | 苏州市吴通电子有限公司 | A kind of contact pcb board cleaning device |
| CN108426064A (en) * | 2018-02-12 | 2018-08-21 | 芜湖众维教研仪器研发有限责任公司 | A kind of multi-way control valve |
| CN117367921A (en) * | 2023-12-08 | 2024-01-09 | 淄博市检验检测计量研究总院 | Proton membrane gas transmittance measuring device and measuring method |
-
2015
- 2015-12-28 CN CN201510997550.XA patent/CN105402188B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 王启义: "公用转阀方案设计", 《液压气动与密封》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971958A (en) * | 2016-06-12 | 2016-09-28 | 山东嘉岩石油科技开发有限公司 | Two-position four-way rotating reversing valve |
| CN107008840A (en) * | 2017-05-27 | 2017-08-04 | 江苏德生新材料锻造有限公司 | Hydraulic rapid forging press |
| CN107084168A (en) * | 2017-05-27 | 2017-08-22 | 江苏德生新材料锻造有限公司 | A kind of hydraulic reversing valve |
| CN107084168B (en) * | 2017-05-27 | 2019-06-07 | 江苏德生新材料锻造有限公司 | A kind of hydraulic reversing valve |
| CN107442491A (en) * | 2017-09-12 | 2017-12-08 | 苏州市吴通电子有限公司 | A kind of contact pcb board cleaning device |
| CN107442491B (en) * | 2017-09-12 | 2024-02-23 | 苏州市吴通电子有限公司 | Contact type PCB cleaning device |
| CN108426064A (en) * | 2018-02-12 | 2018-08-21 | 芜湖众维教研仪器研发有限责任公司 | A kind of multi-way control valve |
| CN117367921A (en) * | 2023-12-08 | 2024-01-09 | 淄博市检验检测计量研究总院 | Proton membrane gas transmittance measuring device and measuring method |
| CN117367921B (en) * | 2023-12-08 | 2024-03-01 | 淄博市检验检测计量研究总院 | Proton membrane gas transmittance measuring device and measuring method |
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| Publication number | Publication date |
|---|---|
| CN105402188B (en) | 2017-08-29 |
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Granted publication date: 20170829 Termination date: 20181228 |