CN108831664A - A kind of stable-pressure device for having transducing function for low temperature compression air chamber - Google Patents
A kind of stable-pressure device for having transducing function for low temperature compression air chamber Download PDFInfo
- Publication number
- CN108831664A CN108831664A CN201810474376.4A CN201810474376A CN108831664A CN 108831664 A CN108831664 A CN 108831664A CN 201810474376 A CN201810474376 A CN 201810474376A CN 108831664 A CN108831664 A CN 108831664A
- Authority
- CN
- China
- Prior art keywords
- low temperature
- gas
- energy converter
- temperature compression
- barostat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The present invention relates to a kind of stable-pressure devices for having transducing function for low temperature compression air chamber, for solving the problems, such as in rapid refrigerating system low temperature compression gas, superficial vapor is pressed stable in different environments, while having the effect of adapting to variation of ambient temperature and pressure change on a large scale.It specifically includes：The energy converter and voltage-stablizer being connected to by connecting tube；It is provided with the entrance of low temperature compression gas on the energy converter, heat exchange is carried out by its internal transduction piece group being arranged and the low temperature compression gas；The low temperature compression gas after heat exchange enters the voltage-stablizer by the connecting tube, is discharged after the voltage-stablizer pressure stabilizing.The present invention uses energy converter, so that low temperature compression gas greatly reduces the impact to voltage-stablizer diaphragm unit when air chamber is discharged, increases diaphragm service life, promotes voltage-stablizer voltage regulation result, and without unfavorable phenomenons such as frostings；Voltage-stablizer is used, is stablized so that low temperature compression gas in input and output gas chamber, keeps the liquid pressurized gas superficial vapor in low temperature cavity to press.
Description
Technical field
The present invention relates to a kind of stable-pressure devices, and in particular to a kind of stable-pressure device for low temperature compression air chamber belongs to
Microwave communication equipment technical field.
Background technique
Microwave electron system all plays a crucial role in various communication systems, the skill of high performance microwave system
Art index and characteristic play critical effect in entire communication system.Nowadays, since superconductor self-discovery, by
It is widely used in the production of microwave device.However, either high-temperature superconductive device or low-temperature superconducting device, operating temperature exists
100K (subzero 173 degrees Celsius) is hereinafter, need to meet lower operating ambient temperature requirement.
There are mainly two types of the methods of cooling high-temperature superconducting electronic device：One is directly purchase refrigeration machine cooling, cost compared with
Greatly, up to tens of thousands of members, and dozens of minutes is generally required to a few houres etc. by the cooling time of room temperature to liquid nitrogen temperature, it is difficult to
Meet the needs of fast-refrigerating；Another method is cooled down using low temperature compression gas, and electronic device is directly put into insulation
It in low-temperature (low temperature) vessel, inputs low temperature compression gas (liquid nitrogen), low-temperature (low temperature) vessel and high-temperature superconductor electronic device is directly cooling, the short time
It inside can achieve required temperature, may be implemented quickly to cool down very much, but the test job of device can not be carried out.Currently, most
Good method is placed in high-temperature superconductor electronic device in the gap of vacuum chamber and low temperature compression air chamber, superconduction can be made to cool down
System compact；And low temperature compression air chamber is small and other effects with cool down rapid, the operation is stable, noise.
However, liquid pressurized gas is ceaselessly carrying out energy exchange, low temperature compression when being cooled down using low temperature compression gas
If air chamber is directly connected with outside air, when superconduction cooling system environment or position changes and internal system
When low temperature compression gas gross changes, the operating temperature of superconductive device will change, this will result directly in it cannot be just
Often work, and the unfavorable phenomenons such as the rapid frosting in gas outlet are appeared in, influence system stability；If directlyed adopt traditional
Counterbalance valve, one side counterbalance valve do not have this link of transducing, it is difficult to which the case where coping with big gas output, a large amount of energy exchanges causes
Its cisco unity malfunction, on the other hand, the elastic force range of counterbalance valve is larger, it is difficult to meet real work demand.Therefore, it designs simultaneously
Preparation one with transduction, can be used for the stable-pressure device of low temperature compression gas, have very big practical application value.
Summary of the invention
In view of this, the present invention provides a kind of stable-pressure device for having transducing function for low temperature compression air chamber, it is
It is continually and steadily worked and is provided safeguard in complex work environment using the superconductive electronic device of low temperature compression air chamber fast-refrigerating,
It solves the problems, such as in superconduction cooling system in the transducing of different temperature-fall period low temperature compression gases simultaneously.
The stable-pressure device for having transducing function for low temperature compression air chamber：Including：It is connected to by connecting tube
Energy converter and voltage-stablizer；
Gas access on the energy converter is connected to the gas vent of low temperature compression air chamber, and the energy converter passes through it
The transduction piece group of inside setting and the low temperature compression gas carry out heat exchange；The low temperature compression gas after heat exchange passes through
The connecting tube enters the voltage-stablizer；
The voltage-stablizer includes：Barostat pedestal and barostat upper cover；Gas vent, constant pressure are provided on barostat pedestal
The gas passage B for being respectively arranged with the gas passage A being connected to the connecting tube on device pedestal and being connected to the gas vent；
The setting of barostat upper cover lower end surface is fluted；Barostat upper cover lower surface and the barostat pedestal upper surface pair
It connects, diaphragm is set on interface, seal the gas of setting pressure in the groove of barostat upper cover lower end surface at this time, as
Pressure cavity, gas passage A are not connected to gas passage B；When the gas in the gas passage A opens the diaphragm, institute
Gas passage A is stated to be connected to the gas passage B.
As a kind of preferred embodiment of the invention：The energy converter includes：Energy converter pedestal, interior transduction piece group, outer transducing
Piece group and energy converter upper cover；It is provided with the gas access of low temperature compression gas on the energy converter pedestal, is internally provided with interior change
Energy piece group, the interior transduction piece group are used for and carry out heat exchange from the low temperature compression gas that gas access enters energy converter pedestal；
Outer transduction piece group is provided with outside the interior transduction piece group, the outer transduction piece group is for external environment and the interior transduction piece group
Between heat exchange；The energy converter upper cover is used to close the energy converter pedestal top opening.
As a kind of preferred embodiment of the invention：It further include for the low temperature compression gas to its inside in the energy converter
Carry out the heater and temperature controller of thermal compensation.
As a kind of preferred embodiment of the invention：It further include being carried out for the gas temperature to its inside in the voltage-stablizer
The heater and temperature controller of adjusting.
Beneficial effect：
(1) stable-pressure device of the invention can effectively solve the problem that low temperature compression gas is in different environments in rapid refrigerating system
Superficial vapor presses stable problem, can adapt to a wide range of variation of ambient temperature and pressure change, makes in low temperature compression air chamber
Liquid pressurized gas superficial vapor press stablize；To be to be existed using the superconductive electronic device of low temperature compression air chamber fast-refrigerating
It continually and steadily works and provides safeguard in complex work environment, the low temperature compression gas temperature in holding chamber is stablized；
Increased energy converter solves the problems, such as in superconduction cooling system in the transducing of different temperature-fall period low temperature compression gases,
So that low temperature compression gas greatly reduces the impact to voltage-stablizer diaphragm unit when air chamber is discharged, increase diaphragm service life,
Voltage-stablizer voltage regulation result is promoted, provides the necessary condition of steady operation for voltage-stablizer, while low temperature compression gas is discharged
When air chamber, without the unfavorable phenomenon such as frosting.
(2) energy converter in the present invention is made using inside and outside double transduction piece designs by greatling improve transducer face product
It can efficiently have biggish air contact area very much, cope with the transducing demand of large volume gas.
(3) temperature controller and heater are set in voltage-stablizer and guarantee that the temperature of diaphragm is relatively stable, reduce cryogenic gas with
Environment temperature influences caused by reducing；Temperature controller and heater are set in energy converter, it can be in low temperature compression gas vapor temperature
Spend low or ventilatory capacity it is excessive when and power compensation is provided in extreme environment.
Detailed description of the invention
Fig. 1 is the three-dimensional figure structure schematic representation of pressure stabilizing transducing head of the invention；
Fig. 2 is the schematic diagram of internal structure of pressure stabilizing transducing head of the invention.
Wherein：1- energy converter upper cover；2- sealing ring；The outer transduction piece group of 3-；4- energy converter pedestal；The gas access 5-；In 6-
Transduction piece group；7- temperature controller A；8- connecting tube；9- barostat pedestal；10- temperature controller B；11- heater B；12- diaphragm；13- gas
Body outlet；14- barostat upper cover, 15- energy converter, 16- voltage-stablizer.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present embodiment provides a kind of stable-pressure devices for having transducing function, used in for cooling high-temperature superconducting electronic device
In superconduction cooling system, the low temperature compression air chamber of superconduction cooling system is connected by the stable-pressure device with outside air, can
Guarantee to solve stable gas pressure in low temperature compression air chamber, stablizes superconductive electronic device temperature in complex work environment, make it
It can continually and steadily work.
As shown in Figure 1, the pressure stabilizing transducing head includes 16 two large divisions of energy converter 15 and voltage-stablizer, lead between this two parts
Cross the connection of connecting tube 8.
As shown in Fig. 2, energy converter 15 includes：Energy converter pedestal 4, interior transduction piece 6, outer transduction piece 3 and energy converter upper cover 1.
Wherein 4 lower surface of energy converter pedestal is provided with gas access 5；The wherein low temperature compression in gas access 5 and superconduction cooling system
The gas outlet of air chamber connects.4 upper surface of energy converter pedestal and 5 corresponding position of gas access are provided with for installing interior transduction piece
The interior transduction piece group mounting groove of group 6, interior transduction piece group 6 is used for and gas access 5 is carried out into the cryogenic gas of energy converter pedestal 4
Heat exchange；The outside of interior transduction piece group mounting groove, that is, energy converter pedestal 4 excircle is provided with an outer transduction piece group 3 of circle, changes outside
Energy piece group 3 is for realizing the heat exchange between external environment and interior transduction piece group 6.It is covered on energy converter at the top of energy converter pedestal 4
Lid 1, and be sealed on its interface by sealing ring 2.
The working principle of energy converter 15 is：The cryogenic gas that the low temperature compression air chamber of superconduction cooling system comes out passes through gas
After body entrance 5 enters 15 inside of energy converter, sufficient heat exchange, interior transduction piece group 6 and outer transduction piece group are carried out with interior transduction piece group 6
7 carry out heat exchange by energy converter pedestal 4, and outer transduction piece group 7 is in that gas can be made to carry out sufficient around a circle arrangement mode
Transducing.
Voltage-stablizer 16 includes：Barostat pedestal 9 and barostat upper cover 14；Gas vent 13 is provided on barostat pedestal 9,
The gas passage B for being respectively arranged with the gas passage A being connected to connecting tube 8 on barostat pedestal 9 and being connected to gas vent 13；
The setting of 14 lower end surface of barostat upper cover is fluted, when barostat upper cover 14 is mounted on barostat 9 top of pedestal, on barostat
The pressure cavity of 14 lower end surface of lid and two gas passages of 9 upper surface of barostat pedestal penetrate through, and form gas storehouse.On barostat
It is separated between 9 interface of lid 14 and barostat pedestal by diaphragm 12, is sealed in the groove of 14 lower end surface of barostat upper cover at this time
The gas (about 1 standard atmospheric pressure) of certain pressure, as pressure cavity, to guarantee the low temperature compression air chamber being connected with the device
A constant pressure is kept, not by ambient pressure variations.
On the interface of barostat upper cover 14 and barostat pedestal 9, the gas passage position B is slightly higher, to make film
Piece 12 generates micro deformation, plays minute-pressure adjustment effect to guarantee that diaphragm 12 covers gas passage B.Simultaneously in barostat pedestal 9
Annular groove is arranged in the outside of upper surface pressure cavity corresponding position, and the annular groove inner ring is more smaller than outer ring height, thus
When barostat upper cover 14 is docked with barostat pedestal 9, annular groove outer ring elder generation's stress is crimped and inner ring can be pressed because of diaphragm 12
The power that the left and right sides receives when entering annular groove is uneven and props up intermediate diaphragm, without out-of-flatness.
The working principle of voltage-stablizer 16 is：Gas after 15 transducing of energy converter enters barostat pedestal 9 by connecting tube 8
The gas passage A of top, thus since the gravity of diaphragm 12 is closed between gas passage A and pressure cavity, gas passage A and gas
It is not connected between body access B；When gas flow is sufficiently large, gas opens diaphragm 12, so that gas passage A and gas passage B connects
Logical, the gas in the A of gas passage enters the part (i.e. in the B of gas passage) for having gas vent in gas storehouse, then passes through gas
13 discharge of body outlet.When gas over flood, when air pressure is not as good as 12 gravity of diaphragm, diaphragm 12 is re-closed, so to reach permanent
The function of pressure.
Cryogenic gas is influenced with caused by environment temperature reduction to reduce, is respectively set in 9 lower surface of barostat pedestal
There are temperature controller B10 and heater B11.The gas temperature in energy converter 15 and voltage-stablizer 16 is carried out by temperature controller and heater
It adjusts and (guarantees gas temperature being heated to setting value by temperature controller), to cope with different size of air pressure and environmental change to steady
Press the influence of transducing head.
It is too low in gas temperature to prevent, when ventilatory capacity is excessive, 15 underpower of energy converter, in 4 following table of energy converter pedestal
One end that face is connected with voltage-stablizer 16 is respectively set temperature controller A7 and heater A and carries out power compensation to it.
The specific work process of the pressure stabilizing transducing head is as follows：Before work, according to the test request of high-temperature superconductor system and
Compressed gas feature chooses the diaphragm of suitable material and weight, then can be carried out stable and convenient and fast test job.Make
When being cooled down with superconduction cooling system to high-temperature superconductor electronic device, with the realization of cooling function, liquid pressurized gas exists
Energy exchange is ceaselessly carried out, the superconductive electronic device work needed for it stable always is guaranteed by the principle of its volatilization heat absorption
Temperature, meeting experienced three stages, first stage are reduced to nearly status of criterion liquid nitrogen temperature (about 293k by room temperature during this
It to 80K), can be exchanged in this process along with very big heat, need to continue supplement low temperature compression gas, generated a large amount of
Cryogenic gas；Second stage, liquid nitrogen temperature reaches the setting work temperature of high-temperature superconductor electronic device under the situation of being near the mark
(about 80K to 78K), energy exchange at this moment is slightly lower compared with previous stage, temperature controller A7 and heating in stable-pressure device at this time for degree
Device A works with energy converter work simultaneously, guarantees the work of voltage-stablizer normal table；Phase III, high-temperature superconductive device has been at this time
Reach target using temperature and normally exploit one's power, the transducing of low temperature compression gas is mainly used for neutralizing system leakage heat, at this time
Cryogenic liquid gas consumption how much depend primarily on systems and leak hot size, since the location of superconductive device is generally vacuum
Dark room conditions leakage heat is very low, and energy converter can individually meet transducing needs completely at this time.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. being used for the stable-pressure device for having transducing function of low temperature compression air chamber, it is characterised in that：Including：Pass through connecting tube
(8) energy converter (15) and voltage-stablizer (16) being connected to；
Gas access (5) on the energy converter (15) is connected to the gas vent of low temperature compression air chamber, the energy converter
(15) heat exchange is carried out by its internal transduction piece group being arranged and the low temperature compression gas；The low temperature pressure after heat exchange
Contracting gas enters the voltage-stablizer (16) by the connecting tube (8)；
The voltage-stablizer (16) includes：Barostat pedestal (9) and barostat upper cover (14)；Barostat pedestal is provided with gas on (9)
Body exports (13), be respectively arranged on barostat pedestal (9) the gas passage A being connected to the connecting tube (8) and with the gas
Body exports the gas passage B of (13) connection；Barostat upper cover (14) the lower end surface setting is fluted；The barostat upper cover
(14) lower surface is docked with barostat pedestal (9) upper surface, diaphragm (12) is arranged on interface, at this time the barostat
The gas of sealing setting pressure in the groove of upper cover (14) lower end surface, as pressure cavity, gas passage A and gas passage B are not
Connection；When the gas in the gas passage A opens the diaphragm (12), the gas passage A and the gas passage B connect
It is logical.
2. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as described in claim 1, it is characterised in that：
The energy converter (15) includes：Energy converter pedestal (4), interior transduction piece group (6), outer transduction piece group (3) and energy converter upper cover (1)；
It is provided with the gas access (5) of low temperature compression gas on the energy converter pedestal (4), is internally provided with interior transduction piece group (6), institute
Interior transduction piece group (6) is stated to be used for and carry out heat exchange from the low temperature compression gas that gas access (5) enter energy converter pedestal (4)；
Be provided with outer transduction piece group (3) outside the interior transduction piece group (6), the outer transduction piece group (3) for external environment with it is described
Heat exchange between interior transduction piece group (6)；The energy converter upper cover (1) is used to seal energy converter pedestal (4) top opening
It closes.
3. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as claimed in claim 1 or 2, feature exists
In：It further include heater and the temperature control that thermal compensation is carried out for the low temperature compression gas to its inside in the energy converter (15)
Device.
4. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as claimed in claim 1 or 2, feature exists
In：It further include the heater and temperature controller being adjusted for the gas temperature to its inside in the voltage-stablizer (16).
5. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as claimed in claim 2, it is characterised in that：
The energy converter upper cover (1) is docked with the energy converter pedestal (4) sealing.
6. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as claimed in claim 2, it is characterised in that：
The energy converter pedestal (4) is cylindrical structure, and one week outer transduction piece of circumferentially spaced setting on outer circumference surface forms outer change
It can piece group (3).
7. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as claimed in claim 1 or 2, feature exists
In：On the interface of the barostat upper cover (14) Yu barostat pedestal (9), the position the gas passage B has convex
It rises.
8. being used for the stable-pressure device for having transducing function of low temperature compression air chamber as claimed in claim 1 or 2, feature exists
In：In barostat pedestal (9) upper surface, annular groove, the annular groove is arranged in the outside of pressure cavity corresponding position
Inner ring is higher than its outer ring；When diaphragm (12) are arranged in the barostat upper cover (14) and barostat pedestal (9) interface,
In the diaphragm (12) indentation annular groove at the position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474376.4A CN108831664B (en) | 2018-05-17 | 2018-05-17 | Pressure stabilizer with energy conversion function for low-temperature compressed gas cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474376.4A CN108831664B (en) | 2018-05-17 | 2018-05-17 | Pressure stabilizer with energy conversion function for low-temperature compressed gas cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108831664A true CN108831664A (en) | 2018-11-16 |
| CN108831664B CN108831664B (en) | 2020-07-17 |
Family
ID=64148177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810474376.4A Active CN108831664B (en) | 2018-05-17 | 2018-05-17 | Pressure stabilizer with energy conversion function for low-temperature compressed gas cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108831664B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0355424A (en) * | 1989-04-07 | 1991-03-11 | Yamatake Honeywell Co Ltd | Gas burner controller |
| CN2331945Y (en) * | 1998-06-11 | 1999-08-04 | 祁和益 | Heat-exchange tube having structure of increasing heat-transfer area |
| CN1512572A (en) * | 2002-12-30 | 2004-07-14 | 扬明光学股份有限公司 | Optical valve heat radiator |
| CN101142451A (en) * | 2005-03-18 | 2008-03-12 | 开利商业冷藏公司 | Transcritical refrigeration with pressure addition relief valve |
| CN100523648C (en) * | 2006-03-31 | 2009-08-05 | 株式会社电装 | Supercritical cycle and expansion valve used for refrigeration cycle |
| CN205425444U (en) * | 2016-02-19 | 2016-08-03 | 福建方明环保科技股份有限公司 | Be used for heating fluidic heat transfer energy storage equipment |
-
2018
- 2018-05-17 CN CN201810474376.4A patent/CN108831664B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0355424A (en) * | 1989-04-07 | 1991-03-11 | Yamatake Honeywell Co Ltd | Gas burner controller |
| CN2331945Y (en) * | 1998-06-11 | 1999-08-04 | 祁和益 | Heat-exchange tube having structure of increasing heat-transfer area |
| CN1512572A (en) * | 2002-12-30 | 2004-07-14 | 扬明光学股份有限公司 | Optical valve heat radiator |
| CN101142451A (en) * | 2005-03-18 | 2008-03-12 | 开利商业冷藏公司 | Transcritical refrigeration with pressure addition relief valve |
| CN100523648C (en) * | 2006-03-31 | 2009-08-05 | 株式会社电装 | Supercritical cycle and expansion valve used for refrigeration cycle |
| CN205425444U (en) * | 2016-02-19 | 2016-08-03 | 福建方明环保科技股份有限公司 | Be used for heating fluidic heat transfer energy storage equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108831664B (en) | 2020-07-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017118241A1 (en) | Mechanical vibration-isolated, liquid helium consumption-free and extremely low temperature refrigerating system | |
| CN109449495A (en) | Lithium battery cavity negative pressure formation method and device | |
| CN106973550A (en) | A kind of open type flow-controllable Phase cooling system and its control method | |
| CN112595921A (en) | High-low temperature testing device and method for electronic element | |
| KR20230144642A (en) | Semiconductor heat treatment device | |
| CN108831664A (en) | A kind of stable-pressure device for having transducing function for low temperature compression air chamber | |
| CN110410296A (en) | Compressor and refrigeration equipment with it | |
| CN208816674U (en) | A kind of sealing device suitable for vacuum reacting furnace pipe | |
| CN209487635U (en) | Lithium battery cavity negative pressure formation device | |
| CN208435276U (en) | A kind of electric steam oven with 1 standard atmospheric pressure function of maintenance | |
| CN210807993U (en) | High-temperature liquid cooling device for dimethyl silicone oil | |
| CN113778149A (en) | Thermostat device capable of carrying out continuous variable temperature control of wide temperature zone | |
| CN110131915A (en) | A kind of High-precision temperature control system and method | |
| CN102709216B (en) | A kind of being used for processes the vacuum drying oven of HMDS | |
| CN107676992B (en) | A kind of solar water heater and application method | |
| CN113893989A (en) | Novel vacuum humidification coating film making machine | |
| CN209857159U (en) | Electric heating energy storage furnace | |
| CN209706435U (en) | A kind of plug-in Dewar structure with vacuum interlayer | |
| CN206990885U (en) | The reflecting optics cooling device of laser blast wave transmission | |
| CN206645212U (en) | Cabinet for Cord blood medicine | |
| CN211755075U (en) | Anaerobic high-temperature test chamber | |
| CN214660790U (en) | Automatic cooling type hydraulic pump | |
| CN205912416U (en) | Adjustable fluid connector | |
| CN220841605U (en) | Energy-saving oil press based on PLC controller | |
| CN219120667U (en) | Low-temperature refrigeration control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |