CN111828744A - With stop valve complex joint and idle call test system - Google Patents
With stop valve complex joint and idle call test system Download PDFInfo
- Publication number
- CN111828744A CN111828744A CN202010687176.4A CN202010687176A CN111828744A CN 111828744 A CN111828744 A CN 111828744A CN 202010687176 A CN202010687176 A CN 202010687176A CN 111828744 A CN111828744 A CN 111828744A
- Authority
- CN
- China
- Prior art keywords
- stop valve
- valve
- sealing ring
- rod head
- nut
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 92
- 230000013011 mating Effects 0.000 claims abstract description 9
- 238000004378 air conditioning Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 5
- 238000010168 coupling process Methods 0.000 claims 5
- 238000005859 coupling reaction Methods 0.000 claims 5
- 238000001125 extrusion Methods 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
-
- 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
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention provides a joint matched with a stop valve and an air conditioner testing system, relates to the technical field of air conditioners and aims to solve the technical problem that a sealing ring of the joint for connecting the stop valve is damaged relatively quickly in the air conditioner testing in the prior art. This connect includes the sealing washer, and wherein, be provided with the mating holes on the sealing washer, the stop valve can insert the inside wall in order to realize both sealed cooperation of mating holes and stop valve extrusion mating holes on the radial direction of sealing washer. The invention is used for prolonging the service life of the joint sealing ring matched with the stop valve.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a connector matched with a stop valve and an air conditioner testing system.
Background
In the air conditioner test at present, the joint that is connected the usefulness with the stop valve generally has the condition that the leakage rate is high, the sealing washer is damaged fast, and the life-span is only about 20 days, and the sealing washer piece after the damage easily gets into air conditioning system, influences the air conditioner quality.
Referring to the attached drawings, fig. 1 and fig. 2 show the structure of the existing joint, which mainly comprises a valve rod head, a nut, a sealing ring and other components, wherein the nut is screwed into the stop valve thread, and the sealing ring is in sealing fit with the chamfer structure (conical surface) of the stop valve.
Disclosure of Invention
The invention aims to provide a joint matched with a stop valve and an air conditioner test system, and aims to solve the technical problem that a sealing ring is damaged relatively quickly in a joint for connecting with the stop valve in an air conditioner test in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a joint matched with a stop valve, which comprises a sealing ring, wherein a matching hole is formed in the sealing ring, the stop valve can be inserted into the matching hole, and the stop valve extrudes the inner side wall of the matching hole along the radial direction of the sealing ring so as to realize the sealing matching of the stop valve and the matching hole.
Further, the joint further comprises a valve rod head, the sealing ring is arranged on the valve rod head, and one end, extending into the matching hole, of the stop valve can be abutted to the valve rod head.
Further, be provided with the assembly groove on the terminal surface of valve rod head, the sealing washer is located in the assembly groove just the stop valve stretches into the one end ability butt of mating holes is in on the tank bottom surface of assembly groove.
Further, an internal channel communicated with the assembling groove is arranged on the valve rod head, and the diameter of one end, close to the assembling groove, of the internal channel is smaller than that of the matching hole.
Furthermore, the sealing ring is close to be provided with the location bellying on the circumference lateral surface of assembly groove tank bottom surface one side, set up on the circumference cell wall of assembly groove and put annular spacing groove, the location bellying is located annular spacing inslot.
Furthermore, a chamfer structure is arranged on one side, close to the end part of the valve rod head, of the inner ring of the sealing ring; when the stop valve is inserted into one end of the sealing ring and abuts against the valve rod head, the chamfer structure on the sealing ring is not in contact with the chamfer structure on the stop valve.
Furthermore, a chamfer structure is arranged on one side, close to the end part of the valve rod head, of the inner ring of the sealing ring; when the stop valve is inserted into one end of the sealing ring and abutted against the valve rod head, the chamfer structure on the sealing ring is in contact with the chamfer structure on the stop valve.
Further, the joint further comprises a valve rod head and a nut, the sealing ring is arranged on the valve rod head, the nut is sleeved outside the valve rod head and fixedly connected with the valve rod head, and the stop valve can be screwed into the nut and inserted into the sealing ring.
Furthermore, one end of the valve rod head is abutted against the inner end face of the nut, a check ring is mounted on the inner side face of the nut, and a fixed block between the nut and the valve rod head is limited between the check ring and the end face of the stepped part of the valve rod head.
The test system for the air conditioner comprises the joint matched with the stop valve.
The invention provides a joint matched with a stop valve, which comprises a sealing ring, wherein a matching hole is formed in the sealing ring, and the stop valve extrudes the inner side wall of the matching hole along the radial direction of the sealing ring when inserted into the matching hole, namely, when the diameter of the matching hole is reasonable, the compression ratio of a stop valve pipe body to the sealing ring can be limited within a reasonable range, and even when the screwing depth of the stop valve is relatively deep, the condition that the compression ratio of the stop valve pipe body to the sealing ring exceeds the allowable compression ratio value of the sealing ring can not exist when the stop valve compresses the sealing ring, so that the optimal performance of the sealing ring is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic representation of a prior art fitting for mating with a shut off valve;
FIG. 2 is a schematic view of a prior art shut-off valve connected to a fitting;
FIG. 3 is a schematic diagram of a fitting that mates with a shut-off valve according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a stop valve connected with a joint according to an embodiment of the present invention;
fig. 5 is a partially enlarged view a of fig. 4.
In figure 1, a seal ring; 11. a mating hole; 12. a positioning boss; 2. a valve stem head; 21. an internal channel; 22. an annular limiting groove; 3. a nut; 4. a retainer ring; 5. a fixed block; 6. a stop valve body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1-5, the invention provides a joint matched with a stop valve, which comprises a sealing ring 1, wherein a matching hole 11 is formed in the sealing ring 1, the stop valve can be inserted into the matching hole 11, and the stop valve presses the inner side wall of the matching hole 11 along the radial direction of the sealing ring 1 to realize the sealing matching of the stop valve and the sealing ring. Referring to the attached drawing, fig. 1 shows the structure of the existing joint, and fig. 2 shows the structural schematic diagram of the existing joint matching with the stop valve pipe body, and it can be seen from the diagram that the sealing ring is in sealing fit with the chamfer structure (conical surface) of the stop valve, when the stop valve is screwed in to a relatively deep depth, the condition exceeding the compression ratio allowable value of the sealing ring exists when the stop valve compresses the sealing ring, so that the sealing ring is damaged quickly; the joint matched with the stop valve provided by the invention can be seen from fig. 3-5, when the stop valve is inserted into the matching hole 11, the stop valve presses the inner side wall of the matching hole 11 along the radial direction of the sealing ring 1, that is, when the diameter of the matching hole 11 is reasonably set, the compression ratio of the stop valve pipe body 6 to the sealing ring 1 can be limited within a reasonable range, and even when the depth of screwing the stop valve is relatively deep, the condition that the compression ratio of the stop valve compresses the sealing ring does not exceed the allowable compression ratio of the sealing ring.
Referring to fig. 4 and 5, it can be seen that the fitting hole 11 is a cylindrical hole, the right section of the end face chamfer structure of the stop valve pipe body 6 is fitted with the fitting hole 11, and the position of the stop valve pipe body 6 in sealing fit with the sealing ring is changed and the sealing mode is changed by adjusting the structure of the joint; and because the matching hole 11 is a cylindrical hole, the compression ratio of the sealing ring can not be influenced by changing the depth of screwing the valve into the sealing ring 1. So as to ensure the best performance of the sealing ring and prolong the service life of the sealing ring.
As an alternative embodiment, the joint further comprises a valve rod head 2, the sealing ring 1 is arranged on the valve rod head 2, and one end of the stop valve extending into the matching hole 11 can abut on the valve rod head 2. Since the valve tip 2 is a rigid member, the shut-off valve body 6 cannot be screwed in any further when the shut-off valve body 6 comes into contact with the valve tip 2. The specific structure may be as follows: an assembly groove is formed in the end face of the valve rod head 2, the sealing ring 1 is located in the assembly groove, and one end, extending into the matching hole 11, of the stop valve can abut against the bottom face of the assembly groove; the valve rod head 2 is provided with an internal passage 21 communicated with the assembly groove, and the diameter of one end of the internal passage 21 close to the assembly groove is smaller than that of the matching hole 11. Referring to fig. 3, it is shown that the diameter of the end of the internal passage 21 near the fitting groove is smaller than the diameter of the fitting hole 11, and referring to fig. 4, the shut-off valve body 6 is shown abutting on the valve tip 2.
As an alternative embodiment, referring to fig. 3-5, a positioning protrusion 12 is provided on a circumferential outer side surface of the seal ring 1 on a side close to a bottom surface of the assembly groove, an annular limiting groove 22 is provided on a circumferential groove wall of the assembly groove, and the positioning protrusion 12 is located in the annular limiting groove 22. When the sealing ring 1 is arranged in an assembly groove on the valve rod head 1, the positioning lug boss 12 on the sealing ring 1 is positioned in the annular limiting groove 22 on the assembly groove, the annular limiting groove 22 is used for avoiding the positioning lug boss 12 on the sealing ring 1, and the sealing ring 1 is contacted with the bottom surface of the assembly groove, so that the positioning assembly of the sealing ring 1 is realized.
As an alternative embodiment, the inner ring of the sealing ring 1 is provided with a chamfer structure on one side close to the end part of the valve rod head 2; when the stop valve is inserted into one end of the sealing ring 1 and abuts against the valve rod head 2, the chamfer structure on the sealing ring 1 is not contacted with the chamfer structure on the stop valve. Referring to fig. 4 and 5, there is a chamfer structure on the right side of the section of the stop valve pipe body 6 in sealing fit with the seal ring 1, and when the stop valve pipe body 6 extends into contact with the valve rod head 2, at this moment, the corresponding chamfer structure on the stop valve pipe body 6 does not contact with the chamfer structure on the seal ring 1, namely, there is a space between the two chamfer structures.
Alternatively, when the shut-off valve is inserted into the seal ring 1 and the shut-off valve pipe body 6 is in contact with the valve rod head 2, the chamfer structure on the shut-off valve may be in contact with the chamfer structure on the seal ring 1, thereby further achieving sealing.
As an alternative embodiment, referring to fig. 3-4, the joint further comprises a valve rod head 2 and a nut 3, the sealing ring 1 is arranged on the valve rod head 2, the nut 3 is sleeved outside the valve rod head 2, the nut 3 is fixedly connected with the valve rod head 2, and the stop valve can be screwed into the nut 3 and inserted into the sealing ring 1. The specific fixing manner of the valve rod head 2 and the nut 3 can be as follows: one end of the valve rod head 2 is pressed against the inner end face of the nut 3, the check ring 4 is installed on the inner side face of the nut 3, and the fixing block 5 between the nut 3 and the valve rod head 2 is limited between the check ring 4 and the end face of the stepped part of the valve rod head 2, so that the valve rod head 2 is tightly clamped inside the nut 3. In addition, the left side of the valve rod head 2 is provided with threads, so that the valve rod head can be conveniently butted with other joints or an air conditioner outdoor unit. For the nut 3, the outer peripheral surface of the nut 3 is a regular hexagon, and other regular polygons can be set, so that the tightening use is convenient.
Example 1:
a joint matched with a stop valve comprises a sealing ring 1, wherein a matching hole 11 is formed in the sealing ring 1, the stop valve can be inserted into the matching hole 11, and the stop valve extrudes the inner side wall of the matching hole 11 along the radial direction of the sealing ring 1 so as to realize the sealing matching of the stop valve and the sealing hole;
an assembly groove is formed in the end face of the valve rod head 2, the sealing ring 1 is located in the assembly groove, an internal channel 21 communicated with the assembly groove is formed in the valve rod head 2, the diameter of one end, close to the assembly groove, of the internal channel 21 is smaller than that of the matching hole 11, and one end, extending into the matching hole 11, of the stop valve can abut against the valve rod head 2;
the inner ring of the sealing ring 1 is provided with a chamfer structure on one side close to the end part of the valve rod head 2, and when the stop valve is inserted into one end of the sealing ring 1 and is abutted against the valve rod head 2, the chamfer structure on the sealing ring 1 is not contacted with the chamfer structure on the stop valve.
Example 2:
an air conditioner test system comprising the fitting described in embodiment 1 fitted to a shutoff valve.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A joint matched with a stop valve is characterized by comprising a sealing ring (1), wherein,
be provided with mating holes (11) on sealing washer (1), the stop valve can insert mating holes (11) just the stop valve is followed the radial direction of sealing washer (1) is upwards extruded the inside wall of mating holes (11) is in order to realize both sealed cooperation.
2. A coupling for a shut-off valve according to claim 1, characterised in that the coupling further comprises a valve rod head (2), the sealing ring (1) being arranged on the valve rod head (2), the end of the shut-off valve projecting into the fitting hole (11) being able to abut against the valve rod head (2).
3. A joint for a stop valve according to claim 2, wherein the end face of the valve rod head (2) is provided with a fitting groove, the sealing ring (1) is located in the fitting groove, and the end of the stop valve extending into the fitting hole (11) can abut against the bottom surface of the fitting groove.
4. A coupling for a shut-off valve according to claim 3, characterised in that the valve head (2) is provided with an internal passage (21) communicating with the fitting groove, the diameter of the internal passage (21) near the fitting groove being smaller than the diameter of the fitting hole (11).
5. The joint matched with the stop valve according to claim 3, wherein a positioning lug boss (12) is arranged on the circumferential outer side surface of the sealing ring (1) close to one side of the bottom surface of the assembling groove, an annular limiting groove (22) is arranged on the circumferential groove wall of the assembling groove, and the positioning lug boss (12) is positioned in the annular limiting groove (22).
6. A joint for a stop valve according to any of claims 2-5, wherein the inner ring of the sealing ring (1) is provided with a chamfer structure on the side close to the end of the valve stem head (2); when the stop valve is inserted into one end of the sealing ring (1) and is abutted to the valve rod head (2), the chamfer structure on the sealing ring (1) is not contacted with the chamfer structure on the stop valve.
7. A joint for a stop valve according to any of claims 2-5, wherein the inner ring of the sealing ring (1) is provided with a chamfer structure on the side close to the end of the valve stem head (2); when the stop valve is inserted into one end of the sealing ring (1) and abutted to the valve rod head (2), the chamfer structure on the sealing ring (1) is in contact with the chamfer structure on the stop valve.
8. A coupling cooperating with a stop valve according to any one of claims 1-5, characterized in that the coupling further comprises a valve stem head (2) and a nut (3), the sealing ring (1) being arranged on the valve stem head (2), the nut (3) being fitted over the valve stem head (2), the nut (3) being fixedly connected to the valve stem head (2), the stop valve being screwable into the nut (3) and insertable into the sealing ring (1).
9. The joint matched with the stop valve according to claim 8, wherein one end of the valve rod head (2) is abutted against the inner end face of the nut (3), a retaining ring (4) is installed on the inner side face of the nut (3), and a fixing block (5) between the nut (3) and the valve rod head (2) is limited between the retaining ring (4) and the end face of the stepped portion of the valve rod head (2).
10. An air conditioning test system comprising the connector according to any one of claims 1 to 9 fitted to a shut-off valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010687176.4A CN111828744A (en) | 2020-07-16 | 2020-07-16 | With stop valve complex joint and idle call test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010687176.4A CN111828744A (en) | 2020-07-16 | 2020-07-16 | With stop valve complex joint and idle call test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111828744A true CN111828744A (en) | 2020-10-27 |
Family
ID=72923347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010687176.4A Pending CN111828744A (en) | 2020-07-16 | 2020-07-16 | With stop valve complex joint and idle call test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111828744A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH447060A (en) * | 1964-10-07 | 1967-11-15 | Schmiedl Gustav | Adjustable sealing of a swiveling outlet pipe of a valve |
| US4029345A (en) * | 1974-05-20 | 1977-06-14 | Antonio Romanelli | Pipe fittings |
| US4938255A (en) * | 1989-11-20 | 1990-07-03 | Huntington Mechanical Laboratories, Inc. | Sealer for vacuum containers |
| DE19533106A1 (en) * | 1995-09-07 | 1997-03-13 | Koerner Hans Holger | Pipe fitting |
| FR2893698A1 (en) * | 2005-11-18 | 2007-05-25 | Legris Sa | Instantaneous coupling connection for connecting metallic tubes for e.g. hydraulic transmission, has annular partition including rear surface constituting flange of housing for locking element, where nut carries joint at level of section |
| JP2007292128A (en) * | 2006-04-21 | 2007-11-08 | Daikin Ind Ltd | Joining member for pipe joint |
| US20080136178A1 (en) * | 2004-07-21 | 2008-06-12 | Parker-Hannifin Corporation | Adaptor and Method For Converting Standard Tube Fitting/Port to Push-To-Connect Tube Fitting/Port |
| CN101832434A (en) * | 2010-05-20 | 2010-09-15 | 龚岳强 | Connecting device of compressed air tube and application thereof |
| CN201772163U (en) * | 2010-05-28 | 2011-03-23 | 上海大众燃气有限公司 | Screwed movable joint |
| CN103090142A (en) * | 2013-01-30 | 2013-05-08 | 周纪昌 | Quick coupling provided with flange and used for split type air conditioner |
| CN203115370U (en) * | 2012-12-25 | 2013-08-07 | 陈良书 | Connecting structure of valve |
| EP2715200A1 (en) * | 2011-05-31 | 2014-04-09 | Parker Hannifin GmbH | Play-free plug connection for pipe or tube lines |
| CN206268496U (en) * | 2016-11-24 | 2017-06-20 | 浙江巨泉铜业有限公司 | A kind of loose joint ball valve of high leakproofness |
| CN212718487U (en) * | 2020-07-16 | 2021-03-16 | 格力电器（武汉）有限公司 | With stop valve complex joint and idle call test system |
-
2020
- 2020-07-16 CN CN202010687176.4A patent/CN111828744A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH447060A (en) * | 1964-10-07 | 1967-11-15 | Schmiedl Gustav | Adjustable sealing of a swiveling outlet pipe of a valve |
| US4029345A (en) * | 1974-05-20 | 1977-06-14 | Antonio Romanelli | Pipe fittings |
| US4938255A (en) * | 1989-11-20 | 1990-07-03 | Huntington Mechanical Laboratories, Inc. | Sealer for vacuum containers |
| DE19533106A1 (en) * | 1995-09-07 | 1997-03-13 | Koerner Hans Holger | Pipe fitting |
| US20080136178A1 (en) * | 2004-07-21 | 2008-06-12 | Parker-Hannifin Corporation | Adaptor and Method For Converting Standard Tube Fitting/Port to Push-To-Connect Tube Fitting/Port |
| FR2893698A1 (en) * | 2005-11-18 | 2007-05-25 | Legris Sa | Instantaneous coupling connection for connecting metallic tubes for e.g. hydraulic transmission, has annular partition including rear surface constituting flange of housing for locking element, where nut carries joint at level of section |
| JP2007292128A (en) * | 2006-04-21 | 2007-11-08 | Daikin Ind Ltd | Joining member for pipe joint |
| CN101832434A (en) * | 2010-05-20 | 2010-09-15 | 龚岳强 | Connecting device of compressed air tube and application thereof |
| CN201772163U (en) * | 2010-05-28 | 2011-03-23 | 上海大众燃气有限公司 | Screwed movable joint |
| EP2715200A1 (en) * | 2011-05-31 | 2014-04-09 | Parker Hannifin GmbH | Play-free plug connection for pipe or tube lines |
| CN203115370U (en) * | 2012-12-25 | 2013-08-07 | 陈良书 | Connecting structure of valve |
| CN103090142A (en) * | 2013-01-30 | 2013-05-08 | 周纪昌 | Quick coupling provided with flange and used for split type air conditioner |
| CN206268496U (en) * | 2016-11-24 | 2017-06-20 | 浙江巨泉铜业有限公司 | A kind of loose joint ball valve of high leakproofness |
| CN212718487U (en) * | 2020-07-16 | 2021-03-16 | 格力电器（武汉）有限公司 | With stop valve complex joint and idle call test system |
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