CN105443768A - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
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- CN105443768A CN105443768A CN201410494748.1A CN201410494748A CN105443768A CN 105443768 A CN105443768 A CN 105443768A CN 201410494748 A CN201410494748 A CN 201410494748A CN 105443768 A CN105443768 A CN 105443768A
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- valve seat
- needle
- valve
- electric expansion
- sleeve
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Abstract
The invention provides an electronic expansion valve. The electronic expansion valve comprises a first valve seat, a second valve seat, a transverse connection pipe, a vertical connection pipe, a valve needle, a return spring and a driving mechanism. The second valve seat is fixedly arranged at the first end of the first valve seat. The middle of the second valve seat is provided with a middle channel. The first end of the second valve seat is provided with a main valve opening communicated with the middle channel. The second end of the second valve seat is provided with a guide hole communicated with the middle channel. The main valve opening and the guide hole are formed coaxially. The first end of the valve needle is arranged in the guide hole. The second end of the valve needle is provided with a stopping-blocking flange. The valve needle is provided with the return spring. The first end of the return spring is connected with the stopping-blocking flange in an abutted mode. The second end of the return spring is connected with the second valve seat in an abutted mode. The driving mechanism is arranged in the first valve seat. The second end of the valve needle is connected with the driving mechanism in an abutted mode and slides along the guide hole under the driving action of the driving mechanism to open or close the main valve opening. According to the electronic expansion valve, the problem that in the prior art, the coaxiality of a screw and a valve needle is difficult to ensure can be solved, the machining difficulty of the electronic expansion valve is lowered, and the machining cost is reduced.
Description
Technical field
The present invention relates to electric expansion valve, be especially applied to the electric expansion valve in the refrigeration system such as air conditioner, refrigerator.
Background technique
At air-conditioning market, due to its indoor set and outdoor unit distant, therefore generally can adopt two electric expansion valves, and these two electric expansion valves must distinguish one-way valve in parallel, so could improve the working efficiency of air-conditioning system to greatest extent.
The electric expansion valve of prior art, the nut of nut assembly is fixed in pilot sleeve, pilot sleeve is fixed on valve seat, needle needs again to be fixed in the valve port of valve seat, therefore require higher to the coaxality of valve seat and nut, need indirectly to control the coaxality of guarantee valve core case and nut through repeatedly assembling procedure, and the coaxality of valve seat and nut is subject to nut, pilot sleeve, valve seat, the impact of the machining accuracy of multiple part such as needle, coaxality not easily ensures, if there is valve core case and nut disalignment, easily there is needle and valve port disalignment phenomenon, and then cause the tight or valve port of sealing valve port to occur the problem of eccentric wear, thus make the Reliability of Microprocessor of mortor operated valve lower, also the working life of electric expansion valve can be shortened.
In patent documentation " CN102454818 ", be by the upper end of the lower end of nut and valve core case is set with, ensured the coaxality of needle and valve core case by the mode of the coaxality controlling the valve port of nut and valve core case.But because needle is arranged on screw rod, therefore just need to be processed with higher required precision to screw rod and needle man-hour adding, and the processing of screw rod and needle is generally carried out respectively, make the processing of screw rod and needle cumbersome, complicated structure, not only increase difficulty of processing, and still can not ensure the coaxality of screw rod and the needle processed well.
Summary of the invention
The object of this invention is to provide a kind of electric expansion valve, the coaxality that can overcome screw rod and needle in prior art is difficult to the problem ensured, simplifies the structure of electric expansion valve, reduces the difficulty of processing of electric expansion valve, saved processing cost.
For solving the problems of the technologies described above, as one aspect of the present invention, providing a kind of electric expansion valve, comprising: the first valve seat; Second valve seat, be fixedly installed on the first end end of the first valve seat, the middle part of the second valve seat is provided with center-aisle, the first end of the second valve seat is provided with the primary valve being communicated to center-aisle, second end of the second valve seat is provided with the pilot hole being communicated to center-aisle, and primary valve and pilot hole are coaxially arranged; Horizontal adapter, is communicated to the inner chamber of the first valve seat; Vertical joint pipe, is fixedly connected on the exit position of primary valve, and primary valve is communicated with the inner chamber of vertical joint pipe and the first valve seat by center-aisle; Needle, first end is slidably arranged in pilot hole, and the second end is provided with stop lug; Return spring, is set in outside needle, and the first end of return spring is connected in stop lug, and the second end is connected to the second end end of the second valve seat; Driving mechanism, is arranged in the first valve seat, and the second end end abutment of needle on driving mechanism, and slides along pilot hole to open or to close primary valve under the driving effect of driving mechanism.
Further, between needle and driving mechanism be bulb plane cooperating structure.
Further, driving mechanism comprises: nut, and be arranged in the first valve seat, nut sleeve is located at outside the second valve seat, and and form sliding cavity between the second valve seat, the second end of needle is arranged in sliding cavity; Screw rod, the glide direction along needle is reciprocally screwed onto in nut, and valve needle is slided along pilot hole to open or to close primary valve.
Further, slide-and-guide cooperating structure is formed between stop lug and the sliding wall of nut.
Further, the second end end of the second valve seat is provided with axial the first sleeve extended towards the second end of needle along needle, and first set jacket casing is located at outside needle, and forms axially locating to stop lug.
Further, the first sleeve and the second valve seat are formed in one structure.
Further, second end end of the second valve seat is provided with axial the first sleeve extended towards the second end of needle along needle, first set jacket casing is located at outside needle, and stop lug is slidably arranged in the first sleeve, and and forms slide-and-guide cooperating structure between the first sleeve.
Further, be formed with the catching step of backstop outside the second valve seat between stop lug and the syringe needle of needle, return spring is set in outside catching step.
Further, the first end end of nut is provided with the second sleeve, forms sliding cavity between the second sleeve and the second valve seat.
Further, the circumference of the second valve seat is evenly provided with multiple center-aisle.
The present invention is provided with center-aisle at the middle part of the second valve seat, the first end of the second valve seat is provided with primary valve, second end of the second valve seat is provided with pilot hole, primary valve is all connected with center-aisle with pilot hole, needle is slidably arranged in pilot hole, and and between pilot hole, form slide-and-guide matching relationship, second end of needle is connected on driving mechanism, when electric expansion valve works, because needle is just connected on driving mechanism, and there is no annexation between driving mechanism, therefore the coaxality between needle and the second valve seat ensures mainly through pilot hole, when processing electric expansion valve, the coaxality only needing to ensure between needle and pilot hole just can avoid the stuck phenomenon in needle working procedure effectively, simplify the structure of electric expansion valve, weaken coaxality between driving mechanism and needle to the impact of electric expansion valve service behaviour, decrease and add the requirement of man-hour to coaxial accuracy between driving mechanism and needle, reduce difficulty of processing, save processing cost.
Accompanying drawing explanation
Fig. 1 diagrammatically illustrates the sectional structure chart of the electric expansion valve according to the first embodiment of the present invention;
Fig. 2 diagrammatically illustrates the sectional structure chart of electric expansion valve according to a second embodiment of the present invention;
Fig. 3 diagrammatically illustrates the sectional structure chart of electric expansion valve according to the third embodiment of the invention;
Fig. 4 diagrammatically illustrates the sectional structure chart of electric expansion valve according to a fourth embodiment of the invention;
The sectional structure chart that second valve seat of the electric expansion valve that Fig. 5 diagrammatically illustrates according to a fifth embodiment of the invention coordinates with needle;
The sectional structure chart that second valve seat of the electric expansion valve that Fig. 6 diagrammatically illustrates according to a sixth embodiment of the invention coordinates with needle;
The sectional structure chart that second valve seat of the electric expansion valve that Fig. 7 diagrammatically illustrates according to a seventh embodiment of the invention coordinates with needle.
Reference character in figure: 10, the first valve seat; 20, the second valve seat; 30, return spring; 40, horizontal adapter; 50, vertical joint pipe; 60, needle; 70, nut; 80, screw rod; 21, primary valve; 22, center-aisle; 23, pilot hole; 24, the first sleeve; 61, stop lug; 62, catching step; 71, sliding cavity.
Embodiment
Below embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Please refer to Fig. 1 to 7, according to embodiments of the invention, electric expansion valve comprises the first valve seat 10, second valve seat 20, return spring 30, horizontal adapter 40, vertical joint pipe 50, needle 60, nut 70 and screw rod 80.First valve seat 10 has inner chamber, and miscellaneous part is arranged in the first valve seat 10.
Second valve seat 20 is fixedly installed on the first end end of the first valve seat 10, the middle part of the second valve seat 20 is provided with center-aisle 22, the first end of the second valve seat 20 is provided with the primary valve 21 being communicated to center-aisle 22, second end of the second valve seat 20 is provided with the pilot hole 23 being communicated to center-aisle 22, and primary valve 21 and pilot hole 23 are coaxially arranged.Preferably, the circumference of the second valve seat 20 is evenly provided with multiple center-aisle 22.
Horizontal adapter 40 is communicated to the inner chamber of the first valve seat 10.Vertical joint pipe 50 is fixedly connected on the exit position of primary valve 21, and when primary valve 21 is opened, primary valve 21 is communicated with the inner chamber of vertical joint pipe 50 and the first valve seat 10 by center-aisle 22, and vertical joint pipe 50 can be connected with horizontal adapter 40.
The first end of needle 60 is slidably arranged in pilot hole 23, and the second end is provided with stop lug 61, can carry out spacing to the axial motion of needle 60.Return spring 30 is set in outside needle 60, and the first end of return spring 30 is connected in stop lug 61, and the second end is connected to the second end end of the second valve seat 20.Return spring 30 can form elastic recoil effect to the motion of needle 60, can open primary valve 21 fast by elastic reaction valve needle 60 when needs valve port is opened, and accelerates the speed that primary valve 21 is opened, and improves the receptance of electric expansion valve work.
Driving mechanism is arranged in the first valve seat 10, and the second end end abutment of needle 60 on driving mechanism, and slides to open or close primary valve 21 along pilot hole 23 under the driving effect of driving mechanism.Be abutting relation between driving mechanism and needle 60, there is no direct annexation.
When electric expansion valve works, because needle 60 is just connected on driving mechanism, and there is no annexation between driving mechanism, therefore the coaxality between needle 60 and the second valve seat ensures mainly through pilot hole 23, when processing electric expansion valve, the coaxality only needing to ensure between needle 60 and pilot hole 23 just can avoid the stuck phenomenon in needle 60 working procedure effectively, simplify the structure of electric expansion valve, weaken coaxality between driving mechanism and needle 60 to the impact of electric expansion valve service behaviour, decrease and add the requirement of man-hour to coaxial accuracy between driving mechanism and needle 60, reduce difficulty of processing, save processing cost.
Preferably, it is bulb plane cooperating structure between needle 60 and driving mechanism, can be reduced further to the coaxality requirement between needle 60 and driving mechanism when electric expansion valve works by the characteristic of ball head structure, and frictional force when needle 60 works with driving mechanism can be reduced.Also can be the cooperating structure of bulb and bulb between needle 60 and driving mechanism, or other cambered surface cooperating structure.
In conjunction with shown in Figure 1, according to the first embodiment of the present invention, driving mechanism comprises nut 70 and screw rod 80, and the nut 70 of electric expansion valve is arranged in the first valve seat 10, and and there is no matching relationship between the second valve seat 20.Screw rod 80 is reciprocally screwed onto in nut 70 along the glide direction of needle 60, and valve needle 60 slides to open or close primary valve 21 along pilot hole 23.The termination that screw rod 80 matches with needle 60 can be plane, and also can be bulb, in the present embodiment, the termination of screw rod 80 be bulb, and the second end end of needle 60 is plane, and the termination of screw rod 80 is connected in the plane of the second end end of needle 60.Screw rod 80 is arranged in nut 70, and and forms abutting relation between needle 60.
Require lower for nut 70 and the coaxality between screw rod 80 and needle 60 in this kind of structure, and the structure of nut 70 itself is comparatively simple, easy to process, operation is less, while ensureing electric expansion valve service behaviour, therefore can reduce the cost of electric expansion valve preferably.
In conjunction with shown in Figure 2, according to a second embodiment of the present invention, in the present embodiment, driving mechanism comprises nut 70 and screw rod 80.Nut 70 is arranged in the first valve seat 10, and nut 70 is set in outside the second valve seat 20, and and form sliding cavity 71 between the second valve seat 20, the second end of needle 60 is arranged in sliding cavity 71.Screw rod 80 is reciprocally screwed onto in nut 70 along the glide direction of needle 60, and valve needle 60 slides to open or close primary valve 21 along pilot hole 23.The termination that screw rod 80 matches with needle 60 can be plane, and also can be bulb, in the present embodiment, the termination of screw rod 80 be bulb, and the second end end of needle 60 is plane, and the termination of screw rod 80 is connected in the plane of the second end end of needle 60.Certainly, driving mechanism also can promote for other structure that needle 60 closes primary valve 21.
In the present embodiment, because nut 70 is set in outside the second valve seat 20, therefore can be improved coaxality when working between needle 60 and screw rod 80 by the coaxality between guarantee nut 70 and the second valve seat 20, improve reliability during electric expansion valve work further.
In conjunction with shown in Figure 3, according to the third embodiment of the invention, it is substantially identical with the second embodiment, difference is, in the present embodiment, form slide-and-guide cooperating structure between the sliding wall of stop lug 61 and nut 70, nut 70 also plays leading role to the slip of needle 60.In this kind of structure, the coaxality between needle 60 and screw rod 80 can be ensured by the coaxality between guarantee nut 70 and pilot hole 23 further, the coaxality quality of fit between needle 60 and screw rod 80 can be improved further.
In conjunction with shown in Figure 4, according to a fourth embodiment of the invention, it is substantially identical with the second embodiment, difference is, in the present embodiment, the first sleeve 24, first sleeve 24 axially extended towards the second end of needle 60 that second end end of the second valve seat 20 is provided with along needle 60 is set in outside needle 60, and forms axially locating to stop lug 61.
First sleeve 24 can be arranged on inside return spring 30, also can be set in outside return spring 30, specifically can determine according to the specifications parameter of return spring 30.Be provided separately between first sleeve 24 and the second valve seat 20 in the present embodiment, first sleeve 24 is arranged on the second end of the second valve seat 20, when needle 60 is opened, and it is inoperative, and when needle 60 closes primary valve 21, the operating position of needle 60 can be ensured, preventing needle 60 from impacting the active force of primary valve 21 excessive and cause damage, also can preventing needle 60 from stressed deflection occurring when entering primary valve 21 and the problem causing needle 60 stuck.
In conjunction with shown in Figure 5, according to a fifth embodiment of the invention, it is substantially identical with the 4th embodiment, difference is, in the present embodiment, the first sleeve 24 and the second valve seat 20 are formed in one structure, conveniently can carry out integration processing to the second valve seat 20 and the first sleeve 24, can manufacturing procedure be simplified, cut down finished cost.
In conjunction with shown in Figure 6, according to a sixth embodiment of the invention, it is substantially identical with the second embodiment, difference is, in the present embodiment, the first sleeve 24, first sleeve 24 axially extended towards the second end of needle 60 that the second end end of the second valve seat 20 is provided with along needle 60 is set in outside needle 60, stop lug 61 is slidably arranged in the first sleeve 24, and and forms slide-and-guide cooperating structure between the first sleeve 24.In the present embodiment, the first sleeve 24 is fixedly installed on the second valve seat 20, and forms leading role by stop lug 61 pairs of needles 60, matches, can lead when needle 60 moves better with pilot hole 23.
In conjunction with shown in Figure 7, according to a seventh embodiment of the invention, be formed with the catching step 62 of backstop outside the second valve seat 20 between the stop lug 61 of needle 60 and the syringe needle of needle 60, return spring 30 is set in outside catching step 62.Catching step 62 can form position-limiting action to the axial motion of needle 60, the movement position of restriction needle 60, thus it is excessive and cause damage effectively to prevent needle 60 from impacting the active force of primary valve 21, also can prevent needle 60 from stressed deflection occurring when entering primary valve 21 and the problem causing needle 60 stuck.
The structure of the present embodiment can have the embodiment of matching relationship to combine with between nut 70 and the second valve seat 20, and also the embodiment of matching relationship can not had to combine with between nut 70 and the second valve seat 20, concrete structure can be determined according to service condition.
In a unshowned embodiment, the first end end of nut 70 is provided with the second sleeve, forms above-mentioned sliding cavity 71 between the second sleeve and the second valve seat 20.The example structure that the example structure coordinated between this second sleeve with needle 60 and nut 70 coordinate with needle 60 when having sliding cavity is similar, repeats no more here.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an electric expansion valve, is characterized in that, comprising:
First valve seat (10);
Second valve seat (20), be fixedly installed on the first end end of described first valve seat (10), the middle part of described second valve seat (20) is provided with center-aisle (22), the first end of described second valve seat (20) is provided with the primary valve (21) being communicated to described center-aisle (22), second end of described second valve seat (20) is provided with the pilot hole (23) being communicated to described center-aisle (22), and described primary valve (21) and described pilot hole (23) are coaxially arranged;
Horizontal adapter (40), is communicated to the inner chamber of described first valve seat (10);
Vertical joint pipe (50), be fixedly connected on the exit position of described primary valve (21), described primary valve (21) is communicated with the inner chamber of described vertical joint pipe (50) and described first valve seat (10) by described center-aisle (22);
Needle (60), first end is slidably arranged in described pilot hole (23), and the second end is provided with stop lug (61);
Return spring (30), be set in described needle (60) outward, the first end of described return spring (30) is connected in described stop lug (61), and the second end is connected to the second end end of described second valve seat (20);
Driving mechanism, be arranged in described first valve seat (10), second end end abutment of described needle (60) on described driving mechanism, and slides along described pilot hole (23) to open or to close described primary valve (21) under the driving effect of described driving mechanism.
2. electric expansion valve according to claim 1, is characterized in that, is bulb plane cooperating structure between described needle (60) and described driving mechanism.
3. electric expansion valve according to claim 1, is characterized in that, described driving mechanism comprises:
Nut (70), be arranged in described first valve seat (10), described nut (70) is set in described second valve seat (20) outward, and and form sliding cavity (71) between described second valve seat (20), the second end of described needle (60) is arranged in described sliding cavity (71);
Screw rod (80), glide direction along described needle (60) is reciprocally screwed onto in described nut (70), drives described needle (60) to slide along described pilot hole (23) to open or to close described primary valve (21).
4. electric expansion valve according to claim 3, is characterized in that, forms slide-and-guide cooperating structure between the sliding wall of described stop lug (61) and described nut (70).
5. electric expansion valve according to any one of claim 1 to 3, it is characterized in that, second end end of described second valve seat (20) is provided with axial the first sleeve (24) extended towards the second end of described needle (60) along described needle (60), described first sleeve (24) is set in described needle (60) outward, and forms axially locating to described stop lug (61).
6. electric expansion valve according to claim 5, is characterized in that, described first sleeve (24) and described second valve seat (20) are formed in one structure.
7. electric expansion valve according to any one of claim 1 to 3, it is characterized in that, second end end of described second valve seat (20) is provided with axial the first sleeve (24) extended towards the second end of described needle (60) along described needle (60), described first sleeve (24) is set in described needle (60) outward, described stop lug (61) is slidably arranged in described first sleeve (24), and and forms slide-and-guide cooperating structure between described first sleeve (24).
8. electric expansion valve according to any one of claim 1 to 3, it is characterized in that, be formed with backstop between the syringe needle of described stop lug (61) and described needle (60) described second valve seat (20) catching step outward (62), described return spring (30) is set in described catching step (62) outward.
9. electric expansion valve according to claim 3, it is characterized in that, the first end end of described nut (70) is provided with the second sleeve, forms described sliding cavity (71) between described second sleeve and described second valve seat (20).
10. electric expansion valve according to any one of claim 1 to 3, is characterized in that, the circumference of described second valve seat (20) is evenly provided with multiple center-aisle (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410494748.1A CN105443768B (en) | 2014-09-25 | 2014-09-25 | Electric expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410494748.1A CN105443768B (en) | 2014-09-25 | 2014-09-25 | Electric expansion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105443768A true CN105443768A (en) | 2016-03-30 |
| CN105443768B CN105443768B (en) | 2019-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410494748.1A Active CN105443768B (en) | 2014-09-25 | 2014-09-25 | Electric expansion valve |
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| Country | Link |
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| CN (1) | CN105443768B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420566A (en) * | 2016-05-23 | 2017-12-01 | 浙江盾安人工环境股份有限公司 | Electric expansion valve |
| CN107631524A (en) * | 2016-07-18 | 2018-01-26 | 浙江盾安禾田金属有限公司 | Electric expansion valve |
| CN107917276A (en) * | 2016-10-10 | 2018-04-17 | 盾安环境技术有限公司 | Electric expansion valve |
| CN109323006A (en) * | 2017-08-01 | 2019-02-12 | 浙江盾安机械有限公司 | Electric expansion valve |
| CN112696498A (en) * | 2019-10-23 | 2021-04-23 | 株式会社鹭宫制作所 | Electric valve and refrigeration cycle system |
| CN114458773A (en) * | 2020-10-21 | 2022-05-10 | 盾安环境技术有限公司 | Electronic expansion valve |
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| JP2001153236A (en) * | 1999-11-26 | 2001-06-08 | Saginomiya Seisakusho Inc | Two-stage motor-driven expansion valve |
| CN2654970Y (en) * | 2003-09-27 | 2004-11-10 | 浙江三花股份有限公司 | Pen tube type valve structure |
| CN2787942Y (en) * | 2005-02-06 | 2006-06-14 | 上海俊乐制冷自控元件有限公司 | Decelerating type electronic expansion valve |
| CN102913678A (en) * | 2012-10-19 | 2013-02-06 | 浙江盾安禾田金属有限公司 | Electronic expansion valve |
| CN103453201A (en) * | 2012-06-04 | 2013-12-18 | 浙江三花股份有限公司 | Electronic expansion valve and assembling method |
| CN103470785A (en) * | 2013-09-30 | 2013-12-25 | 苏州优冷机电科技有限公司 | Electronic expansion valve |
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2014
- 2014-09-25 CN CN201410494748.1A patent/CN105443768B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001153236A (en) * | 1999-11-26 | 2001-06-08 | Saginomiya Seisakusho Inc | Two-stage motor-driven expansion valve |
| CN2654970Y (en) * | 2003-09-27 | 2004-11-10 | 浙江三花股份有限公司 | Pen tube type valve structure |
| CN2787942Y (en) * | 2005-02-06 | 2006-06-14 | 上海俊乐制冷自控元件有限公司 | Decelerating type electronic expansion valve |
| CN103453201A (en) * | 2012-06-04 | 2013-12-18 | 浙江三花股份有限公司 | Electronic expansion valve and assembling method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420566A (en) * | 2016-05-23 | 2017-12-01 | 浙江盾安人工环境股份有限公司 | Electric expansion valve |
| CN107631524A (en) * | 2016-07-18 | 2018-01-26 | 浙江盾安禾田金属有限公司 | Electric expansion valve |
| CN107917276A (en) * | 2016-10-10 | 2018-04-17 | 盾安环境技术有限公司 | Electric expansion valve |
| CN107917276B (en) * | 2016-10-10 | 2022-03-08 | 盾安环境技术有限公司 | Electronic expansion valve |
| CN109323006A (en) * | 2017-08-01 | 2019-02-12 | 浙江盾安机械有限公司 | Electric expansion valve |
| CN109323006B (en) * | 2017-08-01 | 2022-03-08 | 浙江盾安机械有限公司 | Electronic expansion valve |
| CN112696498A (en) * | 2019-10-23 | 2021-04-23 | 株式会社鹭宫制作所 | Electric valve and refrigeration cycle system |
| CN114458773A (en) * | 2020-10-21 | 2022-05-10 | 盾安环境技术有限公司 | Electronic expansion valve |
| CN114458773B (en) * | 2020-10-21 | 2024-03-29 | 盾安环境技术有限公司 | Electronic expansion valve |
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|---|---|
| CN105443768B (en) | 2019-06-04 |
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