CN108916448B - Valve drive for pulse tube expander - Google Patents
Valve drive for pulse tube expander Download PDFInfo
- Publication number
- CN108916448B CN108916448B CN201810949114.9A CN201810949114A CN108916448B CN 108916448 B CN108916448 B CN 108916448B CN 201810949114 A CN201810949114 A CN 201810949114A CN 108916448 B CN108916448 B CN 108916448B
- Authority
- CN
- China
- Prior art keywords
- pressure
- low
- valve rod
- phase cam
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/52—Mechanical actuating means with crank, eccentric, or cam
Abstract
The invention discloses a valve driving device for a pulse tube expander, which comprises: the phase cam assembly comprises a high-pressure phase cam and a low-pressure phase cam, and the high-pressure phase cam and the low-pressure phase cam are coaxially connected to a motor rotating shaft; the valve rod assembly comprises a high-pressure valve rod and a low-pressure valve rod, the lower ends of the high-pressure valve rod and the low-pressure valve rod are respectively connected with a valve core of a valve, the upper ends of the high-pressure valve rod and the low-pressure valve rod are respectively provided with a jacking head assembly, the upper end of the jacking head assembly on the high-pressure valve rod is abutted to a high-pressure phase cam, the upper end of the jacking head assembly on the low-pressure valve rod is abutted to a low-pressure phase cam, a spring is sleeved outside the high-pressure valve rod and the low-pressure valve rod, and the. The valve driving device of the invention utilizes the contact of the high-pressure phase cam, the low-pressure phase cam and the plug component, can reduce the mechanical abrasion in the process of driving the valve to the greatest extent, and prolongs the service life of the valve.
Description
Technical Field
The invention relates to the technical field of low-temperature refrigeration. More particularly, the present invention relates to a valve actuator for a pulse tube expander.
Background
In recent years, demand for cryogenic equipment has increased, and demand for core expanders in cryogenic systems has also increased. With the development and perfection of various low-temperature theories, the understanding of the pulse tube refrigerator is more and more profound, and the mechanism of the internal fluid flow and the temperature reduction process is deeply researched. On the basis, the pulse tube expander is developed by utilizing the flow mechanism of alternating flow and pressure change, so that the expansion and cooling of fluid can be realized, and the problems of large processing difficulty and low efficiency of the expander in a low-flow low-temperature system are effectively solved.
The pulse tube expander realizes the phase adjustment of the gas pressure and the flow in the pulse tube by utilizing the alternate opening and closing of the high-pressure and low-pressure valves and the alternate opening and closing of the hot end phase modulation valve, realizes the pressure reduction and the temperature reduction of the gas after flowing through the pulse tube expander, and realizes the expansion effect. Compared with the existing expander, the pulse tube expander has obvious advantages, simple structure and high reliability, and is suitable for low-temperature refrigeration systems with medium and small flow rates. The moving part in the pulse tube expander is only a valve mechanism, so that the adjustment and control of the gas phase can be realized, and the expansion efficiency of the pulse tube expander is determined. The valve mechanism needs to be opened and closed at low temperature, so that the heat insulation and sealing properties of the valve mechanism directly influence the efficiency of the valve, more fillers and heat insulation parts are bound to be adopted to ensure good heat insulation and sealing performance, the movement fluency of the valve is directly influenced, and therefore, the valve mechanism also puts a very high requirement on a valve driving device of a pulse tube expander.
For the valve driving device of the pulse tube expander, firstly, higher driving force needs to be ensured, and the movement resistance caused by more filling materials or other heat insulation sealing mechanisms can be overcome, so that the valve can be normally opened and closed. Secondly, to ensure that the valve can realize high-frequency motion, the high-frequency motion can effectively improve the expansion efficiency of the expander, improve the flow and improve the flow rate due to the characteristics of the pulse tube expander, but the high-frequency motion is very dependent on the structure of a driving device due to a sealing part and a longer valve rod transmission part. Finally, the driving device of the valve directly influences the service life and the operation stability of the valve, and the good driving device can ensure that the valve can stably operate in a longer time.
Therefore, the valve driving device is very important for the valve of the pulse tube expander, and the good structural design can greatly improve the service life, the expansion efficiency and the operation stability of the pulse tube expander. The traditional low-temperature refrigerator driving device can not meet the requirements, so the invention provides a valve driving device for a pulse tube expander, which meets the requirements of the expander valve.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is a further object of the present invention to provide a valve actuator assembly for a pulse tube expander that minimizes mechanical wear during movement of the valve and extends the useful life of the valve by utilizing the contact of the high pressure phase cam, the low pressure phase cam and the plug assembly. Meanwhile, the mode is stable in contact, no lateral force is generated in the movement process, and the problems of blockage and unsmooth flow in high-frequency movement of the valve can be effectively avoided.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a valve driving apparatus for a pulse tube expander, comprising:
the phase cam assembly comprises a high-pressure phase cam and a low-pressure phase cam, wherein the high-pressure phase cam and the low-pressure phase cam are coaxially connected to a motor rotating shaft;
the valve rod assembly comprises a high-pressure valve rod and a low-pressure valve rod which are in one-to-one correspondence with the high-pressure phase cam and the low-pressure phase cam respectively, the high-pressure valve rod and the low-pressure valve rod vertically penetrate through the valve base, the lower ends of the high-pressure valve rod and the low-pressure valve rod are connected with a valve element of a valve respectively, ejector assemblies are arranged at the upper ends of the high-pressure valve rod and the low-pressure valve rod respectively, the upper end of the ejector assembly on the high-pressure valve rod is abutted to the high-pressure phase cam, the upper end of the ejector assembly on the low-pressure valve rod is abutted to the low-pressure phase cam, a spring is sleeved outside the high-pressure valve rod and the low-pressure valve rod respectively, the lower end of the spring is abutted to the lower end of.
Preferably, in the valve driving apparatus for a pulse tube expander, the high-pressure phase cam and the low-pressure phase cam each include a base circle section, a transition section and a peach point, the base circle section is connected by the two transition section peach points, when the phase cam assembly is stationary, the plug assembly contacts with the base circle section, the valve is closed, and when the phase cam assembly rotates, the plug assembly moves the valve downwards to open through the contact of the base circle section, the transition section and the peach point.
Preferably, the valve driving device for the pulse tube expander, every top subassembly all includes top contact and top connecting piece, the top contact is the pivot that rolls, the pivot that rolls can rotate around the pivot of setting on the top connecting piece, top contact upper end respectively with high-pressure phase cam, low pressure phase cam butt, top connecting piece lower extreme is connected on high-pressure valve rod, the low pressure valve rod respectively, spring upper end and top connecting piece butt.
Preferably, the valve driving device for the pulse tube expander, a groove is formed in the valve base corresponding to the high-pressure valve rod and the low-pressure valve rod, a spring support plate is arranged in the groove, the lower ends of the high-pressure valve rod and the low-pressure valve rod penetrate through the spring support plate, and the lower end of the spring abuts against the upper surface of the spring support plate.
Preferably, in the valve driving device for a pulse tube expander, the high-pressure phase cam and the low-pressure phase cam are both fixedly connected with the rotating shaft of the motor through pins.
Preferably, in the valve driving device for a pulse tube expander, an axis of the high pressure phase cam and an axis of the low pressure phase cam form an included angle.
Preferably, the valve driving device for a pulse tube expander further comprises a fixing member coaxially fixed to the rotation shaft of the motor, and the low pressure phase cam is located between the high pressure phase cam and the fixing member and is in contact with each other.
The invention at least comprises the following beneficial effects:
1. the valve driving device for the pulse tube expander utilizes the contact of the high-pressure phase cam, the low-pressure phase cam and the plug assembly, can reduce mechanical wear in the process of driving the valve to the greatest extent, and prolongs the service life of the valve. Meanwhile, the mode is stable in contact, no lateral force is generated in the movement process, and the problems of blockage and unsmooth flow in high-frequency movement of the valve can be effectively avoided.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a valve actuator for a pulse tube expander in accordance with the present invention;
FIG. 2 is a cross-sectional view of the valve actuator assembly for a pulse tube expander of the present invention;
FIG. 3 is a schematic view of the connection structure of the high pressure valve rod and the valve core of the valve of the present invention;
fig. 4 is a schematic structural diagram of a high-pressure phase cam and a low-pressure phase cam according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 4, a valve driving device for a pulse tube expander includes:
the phase cam assembly 2 comprises a high-pressure phase cam 201 and a low-pressure phase cam 202, wherein the high-pressure phase cam 201 and the low-pressure phase cam 202 are coaxially connected to a rotating shaft 101 of a motor 1;
a valve rod assembly which comprises a high pressure valve rod 502 and a low pressure valve rod 503 which are respectively corresponding to the high pressure phase cam 201 and the low pressure phase cam 202 in a one-to-one mode, the high-pressure valve rod 502 and the low-pressure valve rod 503 vertically penetrate through a valve base 501 and extend downwards, the lower ends of the high-pressure valve rod 502 and the low-pressure valve rod 503 are respectively connected with a valve core of a valve, the upper ends of the high-pressure valve rod 502 and the low-pressure valve rod 503 are both provided with a plug assembly 3, the upper end of the plug assembly 3 on the high-pressure valve rod 502 is abutted against the high-pressure phase cam 201, the upper end of the plug assembly on the low-pressure valve rod 503 is abutted against the low-pressure phase cam 202, the high-pressure valve rod 502 and the low-pressure valve rod 503 are both sleeved with a spring 402, the lower end of the spring 402 is abutted against the upper end of the valve base 501, the upper end of the spring is respectively abutted against the lower end of the corresponding plug assembly 3, the motor 1 rotates to drive the phase cam assembly 2 to rotate so as to drive the high-pressure valve rod 502 and the low-pressure valve rod 503 to move up and down, so that the valve core moves up and down to realize the opening and closing of the valve.
The invention relates to a valve driving device for a pulse tube expander, wherein a high-pressure phase cam 201 and a low-pressure phase cam 202 are coaxially arranged on a rotating shaft 101 of a motor 1, the motor 1 drives the high-pressure phase cam 201 and the low-pressure phase cam 202 to rotate when rotating, the high-pressure phase cam 201 and the low-pressure phase cam 202 can respectively drive corresponding ejector components 3 to move downwards so as to drive a high-pressure valve rod 502 and a low-pressure valve rod 503 to move downwards and further drive a corresponding valve core to move downwards, a spring 402 is compressed in the process, when the valve core moves downwards to the lowest point, the motor continues to rotate, at the moment, the ejector components 3 move upwards under the restoring force of the spring 402, and finally drive a valve core to move upwards, and the opening and closing of a valve are realized in the process of the vertical movement of the valve core, the valve is the existing valve, an air inlet and an air outlet, The air outlets are communicated and not communicated so as to open or close the valve. In the valve driving device, the high-pressure phase cam 201, the low-pressure phase cam 202 and the plug component are contacted, so that the mechanical abrasion of the valve in the motion process can be reduced to the greatest extent, and the service life of the valve is prolonged. Meanwhile, the mode is stable in contact, no lateral force is generated in the movement process, and the problems of blockage and unsmooth flow in high-frequency movement of the valve can be effectively avoided.
In another embodiment of the valve driving apparatus for a pulse tube expander, the high pressure phase cam 201 and the low pressure phase cam 202 each include a base circle section 221, a transition section 223 and a peach point 222, the base circle section 221 is connected with the peach point 222 through the two transition sections 223, when the phase cam assembly 2 is stationary, the plug assembly 3 contacts with the base circle section 221, the valve is closed, and when the phase cam assembly 2 rotates the plug assembly 3 to contact with the peach point 222 through the base circle section 221 and the transition sections 223, the plug assembly 3 moves the valve downwards to open. In this technical scheme, when motor 1 does not rotate, top subassembly 3 contacts with the base circle section 221 of phase cam subassembly 2, the valve is in the closed condition, when motor 1 rotates, top subassembly 3 is through base circle section 221, changeover portion 223 gradually contacts with peach tip 222, top subassembly 3 moves down gradually at this in-process, and spring 402 compresses, thereby drive corresponding case downstream, the valve is opened, the motor continues to rotate, under the restoring force effect of spring 402, top subassembly 3 moves up, thereby drive corresponding case downstream, the valve closes gradually. Fig. 3 shows a schematic structural diagram of the connection between the high-pressure valve rod 502 and the valve core of the valve, the valve includes a valve body 6, a cavity 61 is formed in the valve body 6 along the axial direction, a top cover 62 is covered on the lower end of the valve body 6, an air inlet 63 communicated with the cavity 61 is vertically arranged on the top cover 62, an air outlet 64 communicated with the cavity is arranged on one side of the valve body 6, a valve core rod 65 is coaxially arranged in the cavity 61, a valve core 66 is screwed on the lower end of the valve core rod 65, sealing surfaces 67 are arranged on the inner surface of the cavity between the valve core 66 and the air outlet 64 corresponding to the two sides of the upper end surface of the valve core 66, when the valve core 66; when the valve core 66 moves upward to contact the sealing surface 67, the air outlet 64 is not communicated with the air inlet 63, and the valve is closed. The upper end of the valve body 6 is coaxially provided with a cylinder barrel 7, the high-pressure valve rod 502 is coaxially arranged in the cylinder barrel 7, a shaft sleeve 71 is coaxially arranged in the cylinder barrel 7 and below the high-pressure valve rod 502, the upper end of the shaft sleeve 71 is connected with the high-pressure valve rod 502, the lower end of the shaft sleeve 71 is connected with the valve core rod 65, the shaft sleeve 71 can move up and down, and the high-pressure valve rod 502 drives the valve core 66 to move up and down through the shaft sleeve.
In another technical scheme, each plug component 3 comprises a plug contact element 301 and a plug connecting element 302, the plug contact element 301 is a rolling rotating shaft, the rolling rotating shaft can rotate around the rotating shaft arranged on the plug connecting element 302, the upper end of the plug contact element 301 is respectively abutted to a high-pressure phase cam 201 and a low-pressure phase cam 202, the lower end of the plug connecting element 301 is respectively connected to the upper ends of a high-pressure valve rod 502 and a low-pressure valve rod 503, and the upper end of the spring 402 is abutted to the plug connecting element 302. By utilizing the mode of rotational contact between the plug contact element 301 and the high-pressure phase cam 201 and the low-pressure phase cam 202, the mechanical abrasion in the motion process of driving the valve can be reduced to the greatest extent, and the service life of the valve is prolonged.
In another technical solution, in the valve driving device for a pulse tube expander, a groove is formed in the valve base 501 corresponding to the high pressure valve rod 502 and the low pressure valve rod 503, a spring support plate 401 is arranged in the groove, the lower ends of the high pressure valve rod 502 and the low pressure valve rod 503 both penetrate through the spring support plate 401, and the lower end of the spring 402 both abuts against the upper surface of the spring support plate 401. The spring support plate 401 is located on the valve seat 501 and is used to support the spring 402 and adjust the position of the spring to adjust the restoring force to adapt to different frequencies and different pressures.
In another technical scheme, in the valve driving device for the pulse tube expander, the high-pressure phase cam 201 and the low-pressure phase cam 202 are both fixedly connected with a motor rotating shaft through pins, pin fixing holes are formed in the high-pressure phase cam 201 and the low-pressure phase cam 202, and the pins penetrate through the pin fixing holes to be connected with the motor rotating shaft, so that the high-pressure phase cam 201 and the low-pressure phase cam 202 are fixedly connected with the motor rotating shaft.
In another embodiment, in the valve driving device for a pulse tube expander, an axis of the high pressure phase cam 201 forms an angle with an axis of the low pressure phase cam 202. That is, the high-pressure phase cam 201 and the low-pressure phase cam 202 form a certain angle, and the angle can realize the sequential control of the opening and closing of the corresponding valve, so that the mode is simple and easy, and the efficiency of the pulse tube expander is improved.
In another technical solution, the valve driving device for a pulse tube expander further comprises a fixing member 203 coaxially fixed on the rotating shaft 101 of the motor 1, and the low-pressure phase cam 202 is located between the high-pressure phase cam 201 and the fixing member 203 and contacts with each other. The fixing piece 203 is located at the outermost side of the rotating shaft 101 of the motor 1 and coaxially fixed on the motor driving shaft, and the high-voltage phase cam 201 and the low-voltage phase cam 202 are pressed on the rotating shaft 101 of the motor 1 by screwing the fixing piece 203.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. A valve actuator for a pulse tube expander, comprising:
the phase cam assembly comprises a high-pressure phase cam and a low-pressure phase cam, wherein the high-pressure phase cam and the low-pressure phase cam are coaxially connected with a motor rotating shaft
The above step (1);
the valve rod assembly comprises a high-pressure valve rod and a low-pressure valve rod which are respectively in one-to-one correspondence with the high-pressure phase cam and the low-pressure phase cam, the high-pressure valve rod and the low-pressure valve rod vertically penetrate through a valve base, the lower ends of the high-pressure valve rod and the low-pressure valve rod are respectively connected with a valve core of a valve, the upper ends of the high-pressure valve rod and the low-pressure valve rod are respectively provided with a jacking head assembly, the upper end of the jacking head assembly on the high-pressure valve rod is abutted against the high-pressure phase cam, the upper end of the jacking head assembly on the low-pressure valve rod is abutted against the low-pressure phase cam, a spring is sleeved outside the high-pressure valve rod and the low-pressure valve rod, the lower end of the spring is abutted against the upper;
the valve base is provided with a groove corresponding to the high-pressure valve rod and the low-pressure valve rod, a spring support plate is arranged in the groove, the lower ends of the high-pressure valve rod and the low-pressure valve rod penetrate through the spring support plate, and the lower ends of the springs are abutted to the upper surface of the spring support plate.
2. The valve actuator assembly of claim 1, wherein the high pressure phase cam and the low pressure phase cam each comprise a base circle segment, a transition segment, and a lobe, the base circle segment being connected to the lobe by two transition segments, the plug assembly contacting the base circle segment when the phase cam assembly is stationary and the valve being closed, the plug assembly moving the valve open downward as the phase cam assembly rotates the plug assembly through the base circle segment, the transition segment, and the lobe.
3. The valve driving device for a pulse tube expander according to claim 1, wherein each plug assembly comprises a plug contact member and a plug connection member, the plug contact member is a rolling rotating shaft, the rolling rotating shaft is rotatable about a rotating shaft provided on the plug connection member, the upper end of the plug contact member is respectively abutted against the high pressure phase cam and the low pressure phase cam, the lower end of the plug connection member is respectively connected with the upper end of the high pressure valve rod and the lower end of the low pressure valve rod, and the upper end of the spring is abutted against the plug connection member.
4. The valve actuator for a pulse tube expander of claim 1, wherein the high pressure phase cam and the low pressure phase cam are fixedly connected to the motor shaft by pins.
5. The valve actuator for a pulse tube expander of claim 3, wherein the axis of the high pressure phase cam is angled relative to the axis of the low pressure phase cam.
6. The valve actuator for a pulse tube expander of claim 1, further comprising a stator coaxially fixed to the motor shaft, wherein the low pressure phase cam is located between the high pressure phase cam and the stator and contacts each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810949114.9A CN108916448B (en) | 2018-08-20 | 2018-08-20 | Valve drive for pulse tube expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810949114.9A CN108916448B (en) | 2018-08-20 | 2018-08-20 | Valve drive for pulse tube expander |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108916448A CN108916448A (en) | 2018-11-30 |
| CN108916448B true CN108916448B (en) | 2020-04-10 |
Family
ID=64404862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810949114.9A Active CN108916448B (en) | 2018-08-20 | 2018-08-20 | Valve drive for pulse tube expander |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108916448B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW521121B (en) * | 2001-03-30 | 2003-02-21 | Sanyo Electric Co | Stirling refrigerating device |
| CN106286850B (en) * | 2015-05-27 | 2018-12-18 | 同济大学 | A kind of application of spool, poppet and poppet |
| CN205260912U (en) * | 2015-11-18 | 2016-05-25 | 余成鹏 | Multichannel valve |
| CN106595140B (en) * | 2017-01-19 | 2018-05-22 | 中国科学院理化技术研究所 | Two way phase adjustable valve, pulse tube expander |
| CN207500517U (en) * | 2017-11-22 | 2018-06-15 | 湖北仙彩色母粒有限公司 | A kind of heating unit cam drive reciprocator |
-
2018
- 2018-08-20 CN CN201810949114.9A patent/CN108916448B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108916448A (en) | 2018-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018137636A1 (en) | Electronic expansion valve | |
| CN103511636B (en) | A kind of electric expansion valve | |
| CN110185812B (en) | Ball valve | |
| CN110173574B (en) | Ball valve with long service life | |
| CN105715823A (en) | Electric switching valve | |
| CN107939981A (en) | The low temperature electric control valve and adjusting method of preload adjustable | |
| CN108916448B (en) | Valve drive for pulse tube expander | |
| CN106461099A (en) | Device for controlling or regulating the flow rate and/or flow direction of fluids | |
| US10125873B2 (en) | Valve assembly with rotatable element | |
| CN113446722A (en) | Air deflector assembly and indoor unit with same | |
| CN104132149A (en) | Electric valve | |
| CN207715756U (en) | The low temperature electric control valve of preload adjustable | |
| CN209370495U (en) | Electric expansion valve | |
| KR100677891B1 (en) | A apparatus limiting of a rotor lifting for an electric expansion valve | |
| CN109458464A (en) | Electric expansion valve | |
| CN111426089A (en) | Motor drive four-way reversing valve and carbon dioxide refrigerating and heating system | |
| CN2893345Y (en) | High-temperature high-pressure non-wear ball valve | |
| CN209012499U (en) | Electric expansion valve and the air-conditioning system for using the electric expansion valve | |
| CN210661381U (en) | Pneumatic valve and low-temperature freezing treatment equipment | |
| CN209262284U (en) | Runner end face sealing device and its water outlet valve of gas heating water heater group | |
| WO2024021828A1 (en) | Electronic expansion valve, and refrigeration apparatus | |
| CN217559026U (en) | High-stability electronic expansion valve | |
| CN217634183U (en) | Bearing valve core on electric valve | |
| CN220396685U (en) | Hydraulic drive butterfly valve | |
| CN217874277U (en) | Electronic expansion valve assembly, electronic expansion valve and refrigeration equipment |
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 |