CN104344014A - Four-way valve and air conditioner - Google Patents
Four-way valve and air conditioner Download PDFInfo
- Publication number
- CN104344014A CN104344014A CN201310318129.2A CN201310318129A CN104344014A CN 104344014 A CN104344014 A CN 104344014A CN 201310318129 A CN201310318129 A CN 201310318129A CN 104344014 A CN104344014 A CN 104344014A
- Authority
- CN
- China
- Prior art keywords
- connecting tube
- slide block
- valve
- communicated
- way 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 230000008859 change Effects 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/0655—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with flat slides
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention provides a four-way valve and an air conditioner, wherein the four-way valve comprises: the valve comprises a main valve body, a valve chamber is arranged in the main valve body, a valve core is arranged in the valve chamber, the valve core divides two ends of the valve chamber into a first valve chamber and a second valve chamber which are mutually independent, the valve core comprises a sliding block, and the sliding block is movably arranged in the valve chamber; a plurality of connecting pipes, all communicate with the valve chamber of main valve body, a plurality of connecting pipes include: the valve comprises an E connecting pipe, an S connecting pipe, a C connecting pipe and a D connecting pipe, wherein the E connecting pipe, the S connecting pipe and the C connecting pipe are sequentially arranged on a main valve body along the axial direction of the main valve body, the D connecting pipe is connected to the main valve body and is arranged opposite to the S connecting pipe, in a longitudinal section passing through the axis of the main valve body, a pipe spacing L2 is formed between the inner wall of the E connecting pipe, far away from the C connecting pipe, and the inner wall of the C connecting pipe, far away from the E connecting pipe, and the ratio range of the length L1 of a sliding. The four-way valve can reduce the impact of liquid in the valve body on each part in the moving process of the sliding block.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of four-way valve and air conditioner.
Background technique
In hydraulic system, when commutating soon or closing oil circuit, flow stream velocity can be made to change hastily, because the inertia of working fluid or the inertia of moving element can make intrasystem fluid pressure produce fierce change, and at the very high pressure of instantaneous appearance, this phenomenon is called " liquid hammer ".This pressure change, relays each place of hydraulic system in a liquid with velocity of sound (about 1000 meter per seconds), and this surge pressure, often larger than pressure under normal circumstances doubly a lot of.
Within air-conditioning systems, if start air-conditioning system when the relief opening of compressor is full of a large amount of liquid refrigerants in four-way valve and carry out four-way valve commutation action simultaneously, when slide block commutates to valve seat three pitch-row positions, there will be E connecting tube, S connecting tube and C connecting tube by the state shut completely, namely slide block is positioned at the position at closed dead point.Now, the liquid refrigerant in valve pocket is dammed instantaneously, and flowing velocity is suddenly zero.Because liquid is incompressible, and the ratio of viscosities gas of liquid is much bigger, stopping operating suddenly of compressor, under the inertia effects of liquid motional inertia and compressor moving element, system can produce very large pressure change, occurs very high pressure instantaneously, causes four-way valve to produce " liquid hammer ".Long-term " liquid hammer " can cause the distortion of four-way valve, makes four-way valve cannot normal commutation.
Summary of the invention
The present invention aims to provide a kind of four-way valve and the air conditioner that can reduce liquid hammer impact.
To achieve these goals, according to an aspect of the present invention, provide a kind of four-way valve, comprise: main valve body, be provided with valve chamber in main valve body, be provided with spool in valve chamber, the two ends of valve chamber are separated out the first separate valve chamber and the second valve chamber by spool, spool comprises slide block, and slide block is movably arranged in valve chamber; Multiple connecting tube, all be communicated with the valve chamber of main valve body, multiple connecting tube comprises: be successively set on the E connecting tube on main valve body, S connecting tube and C connecting tube along main valve body axial direction, and to be connected on main valve body and the D connecting tube be oppositely arranged with S connecting tube, in the longitudinal section of the axis through main valve body, form tube pitch L2 between the inwall away from C connecting tube of E connecting tube and the inwall away from E connecting tube of C connecting tube, the length L1 of slide block and the ratio range of tube pitch L2 are between 0.95 to 0.99.
Further, the length L1 of slide block and the ratio of tube pitch L2 are 0.97.
Further, slide block has and E connecting tube and C connecting tube is all communicated with S connecting tube and the primary importance that is all communicated with D connecting tube of E connecting tube and C connecting tube.
Further, slide block has makes E connecting tube be communicated with S connecting tube and the second place that is communicated with D connecting tube of C connecting tube, and makes to be communicated with and the 3rd position be communicated with between E connecting tube and D connecting tube between S connecting tube and C connecting tube.
Further, spool also comprises valve seat, and valve seat to be arranged in valve chamber and to be fixed on main valve body, and slide block slides along valve seat, valve seat is provided with three attachment holes, and three attachment holes are communicated with correspondingly with between E connecting tube, S connecting tube and C connecting tube.
Further, slide block is provided with connectivity slot, when slide block is positioned at the second place, connectivity slot is communicated with E connecting tube and S connecting tube, and when slide block is positioned at the 3rd position, connectivity slot is communicated with S connecting tube and C connecting tube.
Further, the thickness being positioned at the sidewall of E connecting tube side of slide block is less than the diameter of E connecting tube, and the thickness being positioned at the sidewall of C connecting tube side of slide block is less than the diameter of C connecting tube.
Further, spool also comprises support, and slide block is connected on support, and the two ends of support are provided with piston.
Further, the second opening main valve body being provided with the first opening be communicated with the first valve chamber and being communicated with the second valve chamber.
According to a further aspect in the invention, provide a kind of air conditioner, have four-way valve, four-way valve is above-mentioned four-way valve.
Technological scheme of the present invention, the length L1 of the slide block in four-way valve and the ratio of tube pitch L2 are arranged between 0.95 to 0.99, when slide block can be avoided to commutate, block E connecting tube, S connecting tube and C connecting tube at one time completely, namely there is not closed dead point when slide block commutates, thus avoid slide block in movement process, there will be the problem at closed dead point, and then reduce the impact to all parts in the movement process of slide block of the liquid in valve body.Meanwhile, the length L1 of slide block and the ratio of tube pitch L2, between 0.95 to 0.99, can make four-way valve can have enough pressure differences when having certain amount of leakage to guarantee the normal commutation of four-way valve.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of the embodiment according to four-way valve of the present invention;
Fig. 2 shows the structural representation being in refrigeration mode of the four-way valve of Fig. 1;
Fig. 3 shows the structural representation of the stroke that mediates of the four-way valve of Fig. 1; And
Fig. 4 shows the structural representation being in heating mode of the four-way valve of Fig. 1.
The reference character of above-mentioned accompanying drawing is as follows:
10, main valve body; 11, E connecting tube; 12, S connecting tube; 13, C connecting tube; 14, D connecting tube; 22, slide block; 23, support; 24, piston.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 1 shows the structural representation of the embodiment according to four-way valve of the present invention, and as can be seen from the figure, the four-way valve of the present embodiment comprises main valve body 10 and multiple connecting tube.Wherein, be provided with valve chamber, in valve chamber, be provided with spool in main valve body 10, the two ends of valve chamber are separated out the first separate valve chamber and the second valve chamber by spool.Spool comprises slide block 22, and slide block 22 is movably arranged in valve chamber.Multiple connecting tube is all communicated with main valve body 10, connecting tube comprises the E connecting tube 11, S connecting tube 12 and the C connecting tube 13 that to be successively set on along main valve body 10 axial direction on main valve body 10, and be connected to D connecting tube 14 that is on main valve body 10 and that be oppositely arranged with S connecting tube 12, in the longitudinal section of the axis through main valve body, between the inwall away from C connecting tube 13 of E connecting tube 11 and the inwall away from E connecting tube 11 of C connecting tube 13, form tube pitch L2.The length L1 of slide block 22 and the ratio range of tube pitch L2 are between 0.95 to 0.99.
The length L1 of slide block 22 in four-way valve and the ratio of tube pitch L2 are arranged between 0.95 to 0.99, when slide block 22 can be avoided to commutate, block E connecting tube 11, S connecting tube 12 and C connecting tube 13 at one time completely, namely there is not closed dead point when slide block 22 commutates, thus avoid slide block in movement process, there will be the problem at closed dead point, and then reduce the impact to all parts in the movement process of slide block of the liquid in valve body.Meanwhile, the length L1 of slide block 22 and the ratio of tube pitch L2, between 0.95 to 0.99, can make four-way valve can have enough pressure differences when having certain amount of leakage to guarantee the normal commutation of four-way valve.Preferably, the length L1 of slide block 22 and the ratio of tube pitch L2 are 0.97.
In the present embodiment, as shown in Figure 2 and Figure 4, slide block 22 has makes E connecting tube 11 be communicated with S connecting tube 12 and the second place that is communicated with D connecting tube 14 of C connecting tube 13, and makes to be communicated with between S connecting tube 12 and C connecting tube 13 and the 3rd position be communicated with between E connecting tube 11 and D connecting tube 14.Slide block 22 realizes refrigeration in the second place, realizes heating in the 3rd position.Slide block 22 also has the primary importance between the second place and the 3rd position.As shown in Figure 3, when slide block 22 is positioned at primary importance, E connecting tube 11 and C connecting tube 13 are all communicated with S connecting tube 12 and E connecting tube 11 is all communicated with D connecting tube 14 with C connecting tube 13.Because E connecting tube 11 is all communicated with D connecting tube 14 with C connecting tube 13, slide block 22 there will not be closed dead point in running, and namely in the commutation process of slide block 22, D connecting tube 14 is at least communicated with in C connecting tube 13 with E connecting tube 11.Such setting, carry out in the process commutated at slide block 22, all the time there is gap with in E connecting tube 11 or C connecting tube 13 in slide block 22, this gap makes hyperbaric chamber be communicated with in E connecting tube 11 or C connecting tube 13 in the movement process of slide block 22, thus the internal pressure of balance four-way valve self, be reduced in the pressure peak in the hyperbaric chamber in slide block 22 commutation process, and then reduce the possibility that liquid hammer fault occurs.
Spool in the present embodiment comprises valve seat, slide block 22, support 23 and is arranged on the piston 24 at support 23 two ends, and the two ends of valve chamber are separated out the first separate valve chamber and the second valve chamber by piston 24 by spool.Wherein.Valve seat to be arranged in valve chamber and to be fixed on main valve body 10, and slide block 22 can slide along valve seat.Valve seat is provided with three attachment holes, and slide block 22 is connected with support 23 and is slidably disposed on the upper end surface of attachment hole.Three attachment holes are respectively with E connecting tube 11, be communicated with correspondingly between S connecting tube 12 and C connecting tube 13.Slide block 22 offers connectivity slot, and when slide block 22 is positioned at the second place, connectivity slot is communicated with E connecting tube 11 and S connecting tube 12.When slide block 22 is positioned at the 3rd position, connectivity slot is communicated with S connecting tube 12 and C connecting tube 13.The conversion of the position of the slide block 22 in the present embodiment regulates by the pressure difference changed in the first valve chamber and the second valve chamber, relates to the structure and working principle of four-way valve indoor, very common in related domain, does not too much repeat at this.
As shown in Figures 2 to 4, the four-way valve of the present embodiment is also connected with pilot valve in use, pilot valve comprises guide valve blocks, along the 4th connecting tube that its axial direction is disposed with the first connecting tube, the second connecting tube and the 3rd connecting tube and is oppositely arranged with the second connecting tube on guide valve blocks.In guide valve blocks, be provided with pilot valve slide block, pilot valve slide block has the 4th position and the 5th position, and pilot valve slide block is when the 4th position, and the first connecting tube is communicated with the second connecting tube and the 3rd connecting tube is communicated with the 4th connecting tube.Pilot valve slide block is when the 5th position, and the first connecting tube is communicated with the 4th connecting tube and the second connecting tube is communicated with the 3rd connecting tube.The motion of pilot valve slide block is the driving mechanisms control by being connected with this pilot valve slider-actuated.
Have following annexation between pilot valve and four-way valve: the first connecting tube is communicated with the first valve chamber, the 3rd connecting tube is communicated with the second valve chamber, and the second connecting tube is communicated with S connecting tube 12, and the 4th connecting tube is communicated with D connecting tube 14.Preferably, main valve body 10 is provided with the first opening be communicated with the first valve chamber and the second opening be communicated with the second valve chamber, the first connecting tube is communicated with the first valve chamber by the first opening, and the 3rd connecting tube is communicated with the second valve chamber by the second opening.
The movement of pilot valve slide block between the 4th position and the 5th position can change the flow direction of the medium in four-way valve, and then the pressure state changed in the first valve chamber and the second valve chamber, thus the adjustment realized the pressure difference in the first valve chamber and the second valve chamber, reach the regulating action realized the position of the slide block 22 in four-way valve.
Present invention also offers a kind of air conditioner, the embodiment according to air conditioner of the present invention comprises four-way valve, and this four-way valve is above-mentioned four-way valve.Owing to having above-mentioned four-way valve, liquid hammer can be reduced and impact, and then extend the working life of air conditioner.
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. a four-way valve, comprising:
Main valve body (10), described main valve body is provided with valve chamber in (10), spool is provided with in described valve chamber, the two ends of described valve chamber are separated out the first separate valve chamber and the second valve chamber by described spool, described spool comprises slide block (22), and described slide block (22) is movably arranged in described valve chamber;
Multiple connecting tube, is all communicated with the valve chamber of described main valve body (10), and described multiple connecting tube comprises:
The E connecting tube (11) on described main valve body (10), S connecting tube (12) and C connecting tube (13) is successively set on along described main valve body (10) axial direction, and be connected to the upper and D connecting tube (14) be oppositely arranged with described S connecting tube (12) of described main valve body (10)
It is characterized in that, in the longitudinal section of the axis through described main valve body (10), form tube pitch L2 between the inwall away from described C connecting tube (13) of described E connecting tube (11) and the inwall away from described E connecting tube (11) of described C connecting tube (13), the length L1 of described slide block (22) and the ratio range of described tube pitch L2 are between 0.95 to 0.99.
2. four-way valve according to claim 1, is characterized in that, the length L1 of described slide block (22) and the ratio of described tube pitch L2 are 0.97.
3. four-way valve according to claim 1, it is characterized in that, described slide block (22) has makes described E connecting tube (11) and described C connecting tube (13) all be communicated with described S connecting tube (12) and the primary importance that is all communicated with described D connecting tube (14) of described E connecting tube (11) and described C connecting tube (13).
4. four-way valve according to claim 1, it is characterized in that, described slide block (22) has makes described E connecting tube (11) be communicated with described S connecting tube (12) and the second place that is communicated with described D connecting tube (14) of described C connecting tube (13), and makes to be communicated with between described S connecting tube (12) and described C connecting tube (13) and the 3rd position of connection between described E connecting tube (11) and described D connecting tube (14).
5. four-way valve according to claim 1, it is characterized in that, described spool also comprises valve seat, described valve seat to be arranged in described valve chamber and to be fixed on described main valve body (10), described slide block (22) slides along described valve seat, described valve seat is provided with three attachment holes, described three attachment holes are communicated with correspondingly with between described E connecting tube (11), described S connecting tube (12) and described C connecting tube (13).
6. four-way valve according to claim 4, it is characterized in that, (22) are provided with connectivity slot to described slide block, when described slide block (22) is positioned at the described second place, described connectivity slot is communicated with described E connecting tube (11) and described S connecting tube (12), when described slide block (22) is positioned at described 3rd position, described connectivity slot is communicated with described S connecting tube (12) and described C connecting tube (13).
7. four-way valve according to claim 6, it is characterized in that, the thickness being positioned at the sidewall of described E connecting tube (11) side of described slide block (22) is less than the diameter of described E connecting tube (11), and the thickness being positioned at the sidewall of described C connecting tube (13) side of described slide block (22) is less than the diameter of described C connecting tube (13).
8. four-way valve according to claim 1, is characterized in that, described spool also comprises support (23), and described slide block (22) is connected on described support (23), and the two ends of described support (23) are provided with piston (24).
9. four-way valve according to claim 1, is characterized in that, described main valve body (10) is provided with the first opening be communicated with described first valve chamber and the second opening be communicated with described second valve chamber.
10. an air conditioner, has four-way valve, it is characterized in that, described four-way valve is four-way valve according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310318129.2A CN104344014A (en) | 2013-07-25 | 2013-07-25 | Four-way valve and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310318129.2A CN104344014A (en) | 2013-07-25 | 2013-07-25 | Four-way valve and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104344014A true CN104344014A (en) | 2015-02-11 |
Family
ID=52500226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310318129.2A Pending CN104344014A (en) | 2013-07-25 | 2013-07-25 | Four-way valve and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104344014A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704635A (en) * | 2017-01-23 | 2017-05-24 | 海信（山东）空调有限公司 | Four-way valve and air conditioner |
| CN110131914A (en) * | 2018-02-08 | 2019-08-16 | 浙江盾安机械有限公司 | Four-way valve and air-conditioning system |
| WO2020087902A1 (en) * | 2018-10-31 | 2020-05-07 | 广东美芝精密制造有限公司 | Four-way valve |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62162469U (en) * | 1986-04-04 | 1987-10-15 | ||
| JPH0452671U (en) * | 1990-09-11 | 1992-05-06 | ||
| CN201281504Y (en) * | 2008-08-24 | 2009-07-29 | 俞德钟 | Three-way thermal recovery valve |
| CN201687986U (en) * | 2010-03-24 | 2010-12-29 | 特灵空调***(中国)有限公司 | Four-way reversal valve and air conditioning system |
| CN102537398A (en) * | 2010-12-08 | 2012-07-04 | 浙江三花制冷集团有限公司 | Reversing valve and sliding block of reversing valve as well as frequency conversion air conditioner using reversing valve |
| CN202349270U (en) * | 2011-10-18 | 2012-07-25 | 浙江盾安禾田金属有限公司 | Electromagnetic four-way reversing valve |
| CN102966759A (en) * | 2012-11-16 | 2013-03-13 | 浙江盾安人工环境股份有限公司 | Electromagnetic four-way reversing valve with pressure protection |
| CN203374885U (en) * | 2013-07-25 | 2014-01-01 | 珠海格力电器股份有限公司 | Four-way valve and air conditioner |
-
2013
- 2013-07-25 CN CN201310318129.2A patent/CN104344014A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62162469U (en) * | 1986-04-04 | 1987-10-15 | ||
| JPH0452671U (en) * | 1990-09-11 | 1992-05-06 | ||
| CN201281504Y (en) * | 2008-08-24 | 2009-07-29 | 俞德钟 | Three-way thermal recovery valve |
| CN201687986U (en) * | 2010-03-24 | 2010-12-29 | 特灵空调***(中国)有限公司 | Four-way reversal valve and air conditioning system |
| CN102537398A (en) * | 2010-12-08 | 2012-07-04 | 浙江三花制冷集团有限公司 | Reversing valve and sliding block of reversing valve as well as frequency conversion air conditioner using reversing valve |
| CN202349270U (en) * | 2011-10-18 | 2012-07-25 | 浙江盾安禾田金属有限公司 | Electromagnetic four-way reversing valve |
| CN102966759A (en) * | 2012-11-16 | 2013-03-13 | 浙江盾安人工环境股份有限公司 | Electromagnetic four-way reversing valve with pressure protection |
| CN203374885U (en) * | 2013-07-25 | 2014-01-01 | 珠海格力电器股份有限公司 | Four-way valve and air conditioner |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704635A (en) * | 2017-01-23 | 2017-05-24 | 海信（山东）空调有限公司 | Four-way valve and air conditioner |
| CN110131914A (en) * | 2018-02-08 | 2019-08-16 | 浙江盾安机械有限公司 | Four-way valve and air-conditioning system |
| CN110131914B (en) * | 2018-02-08 | 2021-07-20 | 浙江盾安机械有限公司 | Four-way valve and air conditioning system |
| WO2020087902A1 (en) * | 2018-10-31 | 2020-05-07 | 广东美芝精密制造有限公司 | Four-way valve |
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| PB01 | Publication | ||
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Application publication date: 20150211 |
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| RJ01 | Rejection of invention patent application after publication |