CN110994869A - Motor junction box assembly, motor assembly and water chilling unit - Google Patents
Motor junction box assembly, motor assembly and water chilling unit Download PDFInfo
- Publication number
- CN110994869A CN110994869A CN201911267162.0A CN201911267162A CN110994869A CN 110994869 A CN110994869 A CN 110994869A CN 201911267162 A CN201911267162 A CN 201911267162A CN 110994869 A CN110994869 A CN 110994869A
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- motor
- terminal
- eddy current
- current heating
- motor terminal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention provides a motor junction box assembly, a motor assembly and a water chilling unit, wherein the motor junction box assembly comprises: motor terminal box (1) and motor terminal post (2), motor terminal post (2) one end insert in motor terminal box (1), outside the other end worn out motor terminal box (1), and motor terminal box subassembly still includes vortex heat generating component (3), vortex heat generating component (3) are connected with motor terminal post (2), and vortex heat generating component (3) are connected with motor terminal post (2) electricity, in order that vortex heat generating component (3) can produce the heat when motor terminal post (2) circular telegram. The eddy current heating component can generate heat when the motor binding post is electrified, condensation is prevented, the hidden danger of electric leakage and electric shock is avoided, an additional external power supply is not required to be added, additional power consumption is not required to be added, the eddy current heating component can be driven to generate heat by transmitting electrified electric quantity of the motor binding post to the eddy current heating component, the energy consumption is low, and the reliability is high.
Description
Technical Field
The invention belongs to the technical field of refrigeration, and particularly relates to a motor junction box assembly, a motor assembly and a water chilling unit.
Background
In the running process of the water chilling unit, the motor can generate a large amount of heat, and in order to cool the motor, a refrigerant needs to be introduced into a motor cooling cavity for circulation to cool the motor and take away the heat; in the process, the cold energy in the cooling cavity is often transmitted to the motor wiring board and the motor wiring terminal, so that the temperature of the motor wiring board and the motor wiring terminal is lower, and when the motor wiring board and the motor wiring terminal with low temperature meet air in the wiring box, water vapor in the air can be condensed into liquid drops to be adhered to the motor wiring board, the motor wiring terminal and the motor wiring terminal when meeting cold, so that the motor wiring terminal is condensed; and water drops condensed in the motor junction box may cause electric leakage and electric shock abnormity, and great hidden danger is generated to personal safety. This is not allowed. Therefore, the problem of condensation of the motor junction box needs to be solved, and the potential personal safety hazard is eliminated. There are existing solutions that avoid condensation by adding external heating or heat generating components, but that increase the extra power consumption. In order to solve the above problems, it is necessary to design a method and structure for solving the problem of motor junction box condensation based on the principle of eddy current heating by using power lines, so as to eliminate the potential safety hazard of human body.
In the prior art, in the running process of the water chilling unit, in order to cool the motor, a refrigerant needs to be introduced into a motor cooling cavity for circulation to cool the motor and take away heat; but can also cause condensation of the motor junction box; the invention discloses a motor junction box assembly, a motor assembly and a water chilling unit, which are researched and designed by the invention.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the motor junction box in the water chilling unit in the prior art is easy to generate condensation; and utilize to increase external heating or the component that generates heat avoids the condensation, but can increase the defect of extra consumption to a motor terminal box subassembly, motor element and cooling water set are provided.
The invention provides a motor terminal box assembly, which comprises:
motor terminal box and motor terminal, motor terminal one end is inserted in the motor terminal box, the other end is worn out outside the motor terminal box, just motor terminal box subassembly still includes vortex heat-generating component, vortex heat-generating component with motor terminal connects, just vortex heat-generating component with motor terminal electricity is connected, in order when motor terminal circular telegram vortex heat-generating component can produce the heat.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating part is an eddy current heating plate with a plate-shaped structure and is fixedly connected with the motor wiring terminal.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating plate is provided with a first accommodating hole for the motor wiring terminal to penetrate through, and the motor wiring terminal penetrates through the first accommodating hole and is fixedly arranged with the eddy current heating plate.
Preferably, the first and second electrodes are formed of a metal,
the motor wiring terminal is more than two, just first accommodation hole also be more than two, and with the motor wiring terminal one-to-one sets up.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating components are more than two and are respectively and mechanically and electrically connected with the motor wiring terminal; and/or the eddy current heating component is arranged inside the motor junction box.
Preferably, the first and second electrodes are formed of a metal,
still include the motor wiring board, the motor wiring board with motor terminal connection, just the vortex generates heat the part and also can be with heat transfer to the motor wiring board.
Preferably, the first and second electrodes are formed of a metal,
the motor wiring board is also provided with a second accommodating hole for accommodating the motor wiring terminal to pass through, and the motor wiring terminal passes through the second accommodating hole and is fixedly arranged with the motor wiring board; and/or the eddy current heating component is also attached to the motor wiring board.
Preferably, the first and second electrodes are formed of a metal,
the second accommodation holes are also more than two and are arranged in one-to-one correspondence with the motor wiring terminals.
The invention also provides a motor assembly, which is characterized in that:
the motor wiring box assembly comprises a motor stator, a motor rotor and a motor shell, and further comprises the motor wiring box assembly, wherein the motor wiring box assembly is electrically connected with the motor stator.
The invention also provides a water chilling unit which comprises the motor assembly.
The motor junction box assembly, the motor assembly and the water chilling unit provided by the invention have the following beneficial effects:
according to the invention, the eddy current heating part is arranged at the motor wiring terminal part of the motor wiring box and is electrically connected with the motor wiring terminal, so that the eddy current heating part can generate heat when the motor wiring terminal is electrified, when a unit runs, the motor wiring terminal can generate huge alternating current, the eddy current heating plate can generate eddy current under the action of the alternating current, and the temperature of the motor wiring board, the motor wiring terminal and the air in the motor wiring box is improved through eddy current heating; the temperature difference between the motor wiring board, the motor wiring terminal and the air in the wiring box is reduced, so that condensation of water vapor in the air due to cold is avoided, the drying of the wiring board, the wiring terminal and the wiring box is ensured, the hidden danger of electric leakage and electric shock is avoided, the personal safety is guaranteed, the stable and reliable operation of the unit is guaranteed, and the reliability of the unit is improved; the eddy current heating plate is used for generating heat, eddy current can be generated only by current when the unit normally works, heat can be generated by the eddy current, an additional external power supply is not needed, additional power consumption is not needed, the electrified electric quantity of the binding post of the motor is transmitted to the eddy current heating component to drive the eddy current heating component to generate heat, the energy consumption is low, the structure form is simple, the eddy current heating plate works by depending on the physical characteristics of the eddy current heating plate, and the reliability is high.
Drawings
Fig. 1 is an internal structural view of a motor junction box assembly of the present invention.
The reference numbers in the figures denote:
1. a motor junction box; 2. a motor wiring terminal; 3. a vortex heat generating component; 4. a motor wiring board; 5. a motor stator; 6. a motor rotor; 7. a motor housing; 8. and a motor cooling cavity.
Detailed Description
As shown in fig. 1, the present invention provides a motor junction box assembly, which includes:
motor terminal box 1 and motor terminal 2, motor terminal 2 one end is inserted in the motor terminal box 1, the other end is worn out outside the motor terminal box 1, just motor terminal box subassembly still includes vortex heat generating component 3 with motor terminal 2 is connected, just vortex heat generating component 3 with motor terminal 2 electricity is connected, in order when motor terminal 2 circular telegram vortex heat generating component 3 can produce the heat.
According to the invention, the eddy current heating part is arranged at the motor wiring terminal part of the motor wiring box and is electrically connected with the motor wiring terminal, so that the eddy current heating part can generate heat when the motor wiring terminal is electrified, when a unit runs, the motor wiring terminal can generate huge alternating current, the eddy current heating plate can generate eddy current under the action of the alternating current, and the temperature of the motor wiring board, the motor wiring terminal and the air in the motor wiring box is improved through eddy current heating; the temperature difference between the motor wiring board, the motor wiring terminal and the air in the wiring box is reduced, so that condensation of water vapor in the air due to cold is avoided, the drying of the wiring board, the wiring terminal and the wiring box is ensured, the hidden danger of electric leakage and electric shock is avoided, the personal safety is guaranteed, the stable and reliable operation of the unit is guaranteed, and the reliability of the unit is improved; the eddy current heating plate is used for generating heat, eddy current can be generated only by current when the unit normally works, heat can be generated by the eddy current, additional external power supplies are not needed to be added, additional power consumption is not needed to be increased, the eddy current heating component can be driven to generate heat by transmitting the electrified electric quantity of the binding post of the motor to the eddy current heating component, the energy consumption is low, the structure form is simple, the eddy current heating plate works by depending on the physical characteristics of the eddy current heating plate, and the reliability is high.
The eddy current heating component 3 is generally made of a material which is easily magnetized, easily generates eddy current, and easily generates heat; the eddy current heating plate is in a plate-shaped structure, a plurality of holes are formed in the upper surface of the plate-shaped structure and can vertically penetrate through the motor wiring terminal, and when alternating current is conducted to the motor wiring terminal, the eddy current heating plate can generate a large amount of eddy current and can generate heat under the action of the eddy current.
The motor junction box 1 is used for wrapping a junction of a motor power line and a motor junction post, and is used for isolating electricity from the external environment, preventing electricity leakage and electric shock and effectively guaranteeing personal safety. The junction box is generally made of an unremitting steel material, so that the magnetization and the eddy current are effectively prevented, and the influence of the junction box on the external environment is reduced.
The motor wiring terminal 2 is composed of a copper bar, the contact places of the middle connection motor wiring board, the eddy current heating plate and the like adopt ceramic-wrapped copper bars, the problem that the motor wiring board and the motor wiring terminal are conductive is effectively isolated, and the electric transmission of the motor wiring terminal to the motor wiring board and the motor casting shell is avoided, so that the hidden troubles of electric leakage and electric shock are formed.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating component 3 is an eddy current heating plate with a plate-shaped structure and is fixedly connected with the motor wiring terminal 2. This is a preferable configuration of the vortex heat generating component of the present invention, and the vortex heat generating capability thereof can be enhanced by the plate-like structure.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating plate is provided with a first accommodating hole for accommodating the motor binding post 2 to penetrate through, and the motor binding post 2 penetrates through the first accommodating hole and is fixedly arranged with the eddy current heating plate. The first accommodation hole that sets up on the board that generates heat through the vortex can hold the motor terminal and pass and be connected the setting with the motor terminal cooperation.
Preferably, the first and second electrodes are formed of a metal,
the motor wiring terminal 2 is more than two, just first accommodation hole also is more than two, and with motor wiring terminal 2 one-to-one sets up. The first accommodating holes and the motor binding posts are arranged in a one-to-one correspondence manner, so that the motor binding posts and the eddy current heating plate can be arranged in a penetrating manner, the mechanical bonding strength between the motor binding posts and the eddy current heating plate is improved, the electrical connection performance between the motor binding posts and the eddy current heating plate is also improved, and the eddy current heating capacity is ensured and improved.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating components 3 are also more than two and are respectively and mechanically and electrically connected with the motor binding post 2; and/or the eddy current heating component 3 is arranged inside the motor junction box 1. The eddy current heating component is preferably configured, and the eddy current heating capacity and the heating amount can be improved by using a plurality of eddy current heating components, and the eddy current heating components are preferably arranged inside the motor junction box.
Preferably, the first and second electrodes are formed of a metal,
the eddy current heating device further comprises a motor wiring board 4, wherein the motor wiring board 4 is connected with the motor wiring terminal 2, and the eddy current heating component 3 can also transfer heat to the motor wiring board 4. Can make through the motor connecting plate motor terminal box can with motor housing between form be connected, because also can lead to its phenomenon of easily taking place the condensation owing to cool gas's invasion and attack on the motor wiring board, consequently on the effect of generating heat through vortex heating component also with its heat transfer to motor wiring board, further prevent that the condensation from taking place, improve the scope of preventing the condensation.
The motor wiring board 4 is made of austenitic stainless steel, so that the generation of a magnetic field on the wiring board can be effectively reduced, and the influence of the magnetic field generated by the wiring board on the operation of the motor is reduced; three motor wiring post holes are formed in the wiring board, and motor wiring posts can be installed in the three motor wiring post holes; the terminal block is typically secured to the motor casing.
Preferably, the first and second electrodes are formed of a metal,
a second accommodating hole for accommodating the motor terminal 2 to pass through is also formed in the motor wiring board 4, and the motor terminal 2 passes through the second accommodating hole and is fixedly arranged with the motor wiring board 4; and/or the eddy current heating component 3 is also attached to the motor wiring board 4. The motor wiring terminal can be accommodated through a second accommodating hole formed in the motor wiring board and penetrates through the second accommodating hole and is matched and connected with the motor wiring terminal; vortex heat generating component 3 still with the laminating of motor wiring board 4 sets up can make the two can direct contact, consequently can make the motor wiring board directly obtain the heat from vortex heat generating component, and then has improved the condensation effect of preventing to the motor wiring board.
Preferably, the first and second electrodes are formed of a metal,
the second accommodating holes are also more than two and are in one-to-one correspondence with the motor wiring terminals 2. The motor wiring terminals and the motor wiring board are arranged in a one-to-one correspondence mode through the second accommodating holes, so that the motor wiring terminals and the motor wiring board can be arranged in a penetrating mode, the mechanical bonding strength between the motor wiring terminals and the motor wiring board is improved, heat can be transmitted to the motor wiring board through the eddy current heating component and the motor wiring terminals or directly transmitted to the motor wiring board through the eddy current heating component, and the condensation prevention effect on the motor wiring board is guaranteed.
The invention also provides a motor assembly which comprises a motor stator 5, a motor rotor 6, a motor shell 7 and the motor junction box assembly, wherein the motor junction box 2 is electrically connected with the motor stator 5. The motor assembly can generate heat when the motor wiring terminal is electrified, when the assembly runs, the motor wiring terminal can generate huge alternating current, the eddy current heating plate can generate eddy current under the action of the alternating current, and the temperature of a motor wiring board, the motor wiring terminal and air in a motor wiring box is improved through eddy current heating; the temperature difference of the air in the motor wiring board, the motor wiring terminal and the wiring box is reduced, so that the water vapor in the air can not generate condensation due to cold, the drying of the wiring board, the wiring terminal and the wiring box is ensured, the hidden danger of electric leakage and electric shock is avoided, the personal safety is ensured, the stable and reliable operation of the unit is ensured, and the reliability of the unit is improved. No additional external power supply is needed; the structure form is simple, depends on the vortex to generate heat board physical characteristic work, and the reliability is high.
The invention also provides a water chilling unit which comprises the motor assembly.
The invention relates to a method structure for solving the condensation problem of a motor junction box based on the principle of heating by utilizing power line eddy current, as shown in figure 1, the structure mainly comprises the following 8 parts: a motor junction box 1; a motor wiring terminal 2; a vortex heat generating component 3; a motor wiring board 4; a motor stator 5; a motor rotor 6; a motor housing 7; a motor cooling chamber 8.
As described above:
the motor casing 7 is integrally cast by cast iron or cast aluminum, the surface and the important contact surface are finely machined in a machining mode to meet the design requirement, a motor cooling cavity is designed in the motor casting, and parts such as a motor rotor, a motor stator and a bearing are placed in the motor casting;
the motor cooling cavity 8 is a cavity body formed in the motor shell casting, and can contain a refrigerant; and the heat generated when the motor operates is taken away through the circulation of the refrigerant.
The motor stator 5 is composed of a coil group and is fixed in a motor shell casting, three-phase electrode terminals of the coil are respectively connected with three motor binding posts on a motor wiring board, and an alternating magnetic field is generated through alternating current;
the motor rotor 6 is a shaft with magnetism, is inserted into a motor stator coil and is coaxial with the motor stator coil, and can rotate under the action of an alternating magnetic field generated by the motor stator and drive the compressor to work.
The motor wiring board 4 is made of austenitic stainless steel, so that the generation of a magnetic field on the wiring board can be effectively reduced, and the influence of the magnetic field generated by the wiring board on the operation of the motor is reduced; three motor wiring post holes are formed in the wiring board, and motor wiring posts can be installed in the three motor wiring post holes; the terminal block is typically secured to the motor casing.
The motor wiring terminal 2 is composed of a copper bar, the contact places of the middle connection motor wiring board, the eddy current heating plate and the like adopt ceramic-wrapped copper bars, the problem that the motor wiring board and the motor wiring terminal are conductive is effectively isolated, and the electric transmission of the motor wiring terminal to the motor wiring board and the motor casting shell is avoided, so that the hidden troubles of electric leakage and electric shock are formed.
The motor junction box 1 is used for wrapping a junction of a motor power line and a motor junction post, and is used for isolating electricity from the external environment, preventing electricity leakage and electric shock and effectively guaranteeing personal safety. The junction box is generally made of an unremitting steel material, so that the magnetization and the eddy current are effectively prevented, and the influence of the junction box on the external environment is reduced.
The eddy current heating component 3 is generally made of a material which is easily magnetized, easily generates eddy current, and easily generates heat; the eddy current heating plate is in a plate-shaped structure, a plurality of holes are formed in the upper surface of the plate-shaped structure and can vertically penetrate through the motor wiring terminal, and when alternating current is conducted to the motor wiring terminal, the eddy current heating plate can generate a large amount of eddy current and can generate heat under the action of the eddy current.
The implementation case is as follows:
in the running process of the water chilling unit, the motor can generate a large amount of heat, and in order to cool the motor, a refrigerant needs to be introduced into a motor cooling cavity for circulation to cool the motor and take away the heat; in the process, the cold energy in the cooling cavity is often transmitted to the motor wiring board and the motor wiring terminal, so that the temperature of the motor wiring board and the motor wiring terminal is lower, and when the motor wiring board and the motor wiring terminal with low temperature meet air in the wiring box, water vapor in the air can be condensed into liquid drops to be adhered to the motor wiring board, the motor wiring terminal and the motor wiring terminal when meeting cold, so that the motor wiring terminal is condensed; and water drops condensed in the motor junction box may cause electric leakage and electric shock abnormity, and great hidden danger is generated to personal safety. This is not allowed.
Therefore, in order to solve the problem of motor junction box condensation, one or more than one (the number of the eddy current heating plates is set according to actual needs) eddy current heating plates are added in the junction box. The eddy current heating plate vertically penetrates through and is fixed on the motor binding post, and when the motor binding post is electrified with alternating current, the eddy current heating plate can generate a large amount of eddy current and can generate heat under the action of the eddy current. After the eddy current heating plate, heat can be transferred to the motor wiring board and the motor wiring terminal, so that the temperature of the motor wiring board and the motor wiring terminal is increased, and the temperature difference of air in the motor wiring board, the motor wiring terminal and the wiring box is reduced. Therefore, the phenomenon that water vapor in the air in the junction box meets condensation and is attached to the motor wiring terminal and the motor wiring board to cause condensation can be effectively prevented. Effectively putting an end to the great hidden danger generated by personal safety.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A motor terminal block subassembly which characterized in that: the method comprises the following steps:
motor terminal box (1) and motor terminal post (2), motor terminal post (2) one end is inserted in motor terminal box (1), the other end is worn out outside motor terminal box (1), just motor terminal box subassembly still includes vortex heat generating component (3), vortex heat generating component (3) with motor terminal post (2) are connected, just vortex heat generating component (3) with motor terminal post (2) electricity is connected, in order when motor terminal post (2) circular telegram vortex heat generating component (3) can produce the heat.
2. The motor terminal block assembly of claim 1, wherein:
the eddy current heating component (3) is an eddy current heating plate with a plate-shaped structure and is fixedly connected with the motor wiring terminal (2).
3. The motor terminal block assembly of claim 2, wherein:
the eddy current heating plate is provided with a first accommodating hole for accommodating the motor wiring terminal (2) to penetrate through, and the motor wiring terminal (2) penetrates through the first accommodating hole and is fixedly arranged with the eddy current heating plate.
4. The motor terminal block assembly of claim 3, wherein:
the motor wiring terminal (2) is more than two, just first accommodation hole also is more than two, and with motor wiring terminal (2) one-to-one sets up.
5. The motor terminal block assembly of any one of claims 1-4, wherein:
the eddy current heating components (3) are more than two and are respectively and mechanically and electrically connected with the motor binding post (2); and/or the eddy current heating component (3) is arranged inside the motor junction box (1).
6. The motor terminal block assembly of any one of claims 1-5, wherein:
still include motor wiring board (4), motor wiring board (4) with motor terminal (2) are connected, just eddy current heat generating component (3) also can be with heat transfer to motor wiring board (4).
7. The motor terminal block assembly of claim 6, wherein:
a second accommodating hole for accommodating the motor wiring terminal (2) to penetrate through is also formed in the motor wiring board (4), and the motor wiring terminal (2) penetrates through the second accommodating hole and is fixedly arranged with the motor wiring board (4); and/or the eddy current heating component (3) is also attached to the motor wiring board (4).
8. The motor terminal block assembly of claim 7, wherein:
the second accommodating holes are more than two and are in one-to-one correspondence with the motor binding posts (2).
9. An electric machine assembly characterized by:
comprising a motor stator (5), a motor rotor (6) and a motor housing (7), and further comprising a motor terminal block assembly according to any one of claims 1-8, wherein the motor terminal (2) is electrically connected to the motor stator (5).
10. A water chilling unit is characterized in that:
comprising the electric machine assembly of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911267162.0A CN110994869A (en) | 2019-12-11 | 2019-12-11 | Motor junction box assembly, motor assembly and water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911267162.0A CN110994869A (en) | 2019-12-11 | 2019-12-11 | Motor junction box assembly, motor assembly and water chilling unit |
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| Publication Number | Publication Date |
|---|---|
| CN110994869A true CN110994869A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911267162.0A Pending CN110994869A (en) | 2019-12-11 | 2019-12-11 | Motor junction box assembly, motor assembly and water chilling unit |
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| CN (1) | CN110994869A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310910A (en) * | 2020-10-27 | 2021-02-02 | 上海水业设计工程有限公司 | Moisture-proof junction box |
-
2019
- 2019-12-11 CN CN201911267162.0A patent/CN110994869A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310910A (en) * | 2020-10-27 | 2021-02-02 | 上海水业设计工程有限公司 | Moisture-proof junction box |
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