CN107218749B - Temperature control method of refrigerating unit and refrigerating unit - Google Patents
Temperature control method of refrigerating unit and refrigerating unit Download PDFInfo
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- CN107218749B CN107218749B CN201710392293.6A CN201710392293A CN107218749B CN 107218749 B CN107218749 B CN 107218749B CN 201710392293 A CN201710392293 A CN 201710392293A CN 107218749 B CN107218749 B CN 107218749B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
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Abstract
The invention discloses a temperature control method of a refrigerating unit and the refrigerating unit, wherein the temperature control method comprises the following steps: presetting a first set temperature value of the first refrigeration loop and a second set temperature value of the second refrigeration loop; acquiring a first temperature value of the first refrigeration loop and a second temperature value of the second refrigeration loop; and controlling the refrigerating time length and the refrigerating interval in the second refrigerating loop according to the preset refrigerating priority of the task control logic when the first temperature value is higher than the first set temperature value and/or the second temperature value is higher than the second set temperature value within the preset time. The temperature control method of the refrigerating unit and the refrigerating unit control the operation state of the second refrigerating circuit according to the difference value between the detected temperature and the set temperature of the first refrigerating circuit and the second refrigerating circuit through the preset task logic control, so that the use requirements of users on greenhouses corresponding to the first refrigerating circuit and the second refrigerating circuit can be met.
Description
Technical Field
The invention relates to the technical field of air conditioning refrigeration, in particular to a temperature control method of a refrigerating unit and the refrigerating unit.
Background
The truck refrigeration double-temperature refrigerating unit on the market at present generally adopts the refrigeration system that connects in parallel, and a condenser corresponds two sets of evaporimeters promptly, and every evaporimeter is responsible for the temperature control of a warm area, and the problem that from this produces is: when the operating temperatures of the two temperature zones reach a certain difference value, most of the refrigerant flows to the evaporator with relatively high operating temperature due to different evaporation pressures, so that the temperature zone with relatively low operating temperature cannot obtain enough refrigerating capacity, the most typical application is that when the two temperature zones are respectively refrigerated/frozen, the freezing chamber is cooled to a preset temperature for a long time, and the problems of melting and deterioration of goods and the like are easily caused particularly obviously after a refrigerating chamber or the freezing chamber is loaded with new goods.
Disclosure of Invention
In view of the above, the present invention provides a temperature control method for a refrigeration unit and a refrigeration unit to solve the above technical problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided a temperature control method for a refrigeration unit, the refrigeration unit including a first refrigeration circuit and a second refrigeration circuit, the temperature control method including:
presetting a first set temperature value of the first refrigeration loop and a second set temperature value of the second refrigeration loop;
acquiring a first temperature value of the first refrigeration loop and a second temperature value of the second refrigeration loop;
and when the first temperature value is higher than the first set temperature value and/or the second temperature value is higher than the second set temperature value within the preset time, the first set temperature value is lower than the second set temperature value, and the refrigerating time and the refrigerating interval in the second refrigerating loop are controlled according to the preset refrigerating priority of the task control logic.
In a further improvement of the temperature control method of the present invention, the controlling the cooling time and the cooling interval in the second cooling circuit according to the cooling priority of the preset task control logic includes:
when the task control logic does not have the refrigeration priorities of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, limiting the refrigeration duration and the refrigeration interval of the second refrigeration circuit so as to enable the first temperature value in the first refrigeration circuit not to exceed the first set temperature value.
The temperature control method is further improved in that when the difference between the first temperature value and the first set temperature value is increased, the operation time length of the second refrigeration loop is controlled to be shortened, and the operation frequency is controlled to be reduced.
In a further improvement of the temperature control method of the present invention, the controlling the cooling time and the cooling interval in the second cooling circuit according to the cooling priority of the preset task control logic includes:
and when the task control logic sets the refrigeration priority of the second refrigeration loop, increasing the operation time length of the second refrigeration loop and shortening the operation frequency so as to enable the second temperature value in the second refrigeration loop not to exceed the second set temperature value.
The temperature control method is further improved in that when the difference between the second temperature value and the second set temperature value is increased, the operation time length of the second refrigeration loop is controlled to be increased, and the operation frequency is controlled to be increased.
The further improvement of the temperature control method of the invention is that the temperature control method further comprises:
and when the task control logic does not have the refrigeration priority of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, the task control logic exits when the first temperature value is not greater than the first set temperature value or any refrigeration circuit in the first refrigeration circuit and the second refrigeration circuit stops running.
The further improvement of the temperature control method of the invention is that the temperature control method further comprises:
and when the refrigeration priority of the second refrigeration loop is set, when the second temperature value is not greater than the second set temperature value, or when any refrigeration loop of the first refrigeration loop and the second refrigeration loop stops running, the task control logic exits.
The temperature control method is further improved in that the first refrigeration circuit is a freezing refrigeration circuit, and the second refrigeration circuit is a refrigerating refrigeration circuit.
According to a second aspect of embodiments of the present invention, there is provided a refrigeration unit comprising: the controller is used for controlling the condenser, and the first refrigeration circuit and the second refrigeration circuit are respectively connected with the condenser;
the first refrigeration loop comprises a first evaporator, a first temperature sensor and a first electromagnetic valve, the first temperature sensor is arranged at a return air inlet of the first evaporator, and the second refrigeration loop comprises a second evaporator, a second temperature sensor and a second electromagnetic valve, the second temperature sensor is arranged at a return air inlet of the second evaporator;
the controller acquires a first temperature value through the first temperature sensor and acquires a second temperature value through the second temperature sensor;
when the first temperature value is higher than a first set temperature value preset by the first refrigeration loop and/or the second temperature value is higher than a second set temperature value preset by the second refrigeration loop within a preset time, the first set temperature value is smaller than the second set temperature value, and the controller controls the refrigeration duration and the refrigeration interval in the second refrigeration loop through the second electromagnetic valve according to the refrigeration priority of the preset task control logic.
In a further development of the refrigerating unit according to the invention, the first refrigerating circuit is a refrigerating circuit and the second refrigerating circuit is a freezing circuit.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects: the temperature control method of the refrigerating unit and the refrigerating unit control the operation state of the second refrigerating circuit according to the difference value between the detected temperature and the set temperature of the first refrigerating circuit and the second refrigerating circuit through the preset task logic control, so that the use requirements of users on greenhouses corresponding to the first refrigerating circuit and the second refrigerating circuit can be met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
FIG. 1 is a flow chart illustrating a method of controlling temperature of a refrigeration unit in accordance with an exemplary embodiment of the present invention;
fig. 2 is a schematic diagram of a refrigeration unit according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
In the following, some embodiments of the present invention will be described in detail with reference to the accompanying drawings, and features in the following examples and examples may be combined with each other without conflict.
As shown in fig. 1, the temperature control method for a refrigeration unit according to the embodiment of the present invention is applied to a refrigeration unit, where the refrigeration unit includes a first refrigeration circuit and a second refrigeration circuit, and the first refrigeration circuit and the second refrigeration circuit are located in different temperature zones to control temperatures of the different temperature zones. In an exemplary embodiment of the present invention, the first refrigeration circuit is a freezing refrigeration circuit (set temperature value less than 0 ℃), the second refrigeration circuit is a refrigerating refrigeration circuit (set temperature greater than 0 ℃), and the two refrigeration circuits can be arbitrarily switched to either a refrigerating circuit or a freezing circuit.
The first refrigeration loop at least comprises a first evaporator, a first temperature sensor arranged at a return air inlet of the first evaporator and a first electromagnetic valve. The first temperature sensor is used for acquiring a real-time temperature value of a temperature zone where the first refrigeration loop is located, and the first electromagnetic valve is used for controlling the first refrigeration loop to refrigerate, stand-by or shut down. The second refrigeration loop at least comprises a second evaporator, a second temperature sensor arranged at a return air inlet of the second evaporator and a second electromagnetic valve. The second temperature sensor is used for acquiring a real-time temperature value of a temperature zone where the second refrigeration loop is located, and the second electromagnetic valve is used for controlling the second refrigeration loop to refrigerate, stand-by or shut down. Wherein the task control logic can be introduced as long as the set temperatures of the two refrigeration circuits reach a certain difference, not limited to the typical setting of refrigeration/freezing, the range of the difference being determined according to the needs of the user.
The temperature control method of the refrigerating unit comprises the following steps:
s101, presetting a first set temperature value of a first refrigeration loop and a second set temperature value of a second refrigeration loop.
The refrigerating unit also comprises a controller and a condenser. The condenser is used for being connected with the first refrigeration loop and the second refrigeration loop respectively, so that the temperature area of the first refrigeration loop is refrigerated through the cooperation of the condenser and the first evaporator, and the temperature area of the second refrigeration loop is refrigerated through the cooperation of the condenser and the second evaporator.
In this embodiment, a user presets a first set temperature value of the first refrigeration loop and a second set temperature value of the second refrigeration loop by setting a control instruction in the controller. The first set temperature value is according to the demand temperature value of the temperature area where the first refrigeration loop is located, and the second set temperature value is according to the demand temperature value of the temperature area where the second refrigeration loop is located, for example: the first refrigeration loop is a freezing refrigeration loop, and the first set temperature value does not exceed 0 ℃; the second refrigeration loop is a refrigeration loop, and the second set temperature value can be 0-5 ℃.
S103, acquiring a first temperature value of the first refrigeration loop and a second temperature value of the second refrigeration loop.
Through controller and the cooperation of first temperature sensor, the first temperature value of first refrigeration circuit is acquireed through first temperature sensor to the controller. Through the cooperation of controller and second temperature sensor, the controller obtains the second temperature value of second refrigeration circuit through second temperature sensor.
And S105, controlling the refrigerating time length and the refrigerating interval in the second refrigerating loop according to the preset refrigerating priority of the task control logic when the first temperature value is higher than the first set temperature value and/or the second temperature value is higher than the second set temperature value in the preset time.
In the invention, when the first temperature value is higher than the first set temperature value, the refrigerating unit needs to refrigerate the first refrigerating loop so that the first temperature value is not higher than the first set temperature value, thereby ensuring that the room temperature corresponding to the first refrigerating loop meets the product storage environment. Similarly, when the second temperature value is higher than the second set temperature, the refrigerating unit needs to refrigerate the second refrigerating circuit, so that the second temperature value is not higher than the second set temperature value, and the room temperature corresponding to the second refrigerating circuit can be ensured to meet the product storage environment.
The controller comprises a preset task control logic, and the task logic control instruction can implement different control strategies according to the refrigeration priorities of the first refrigeration circuit and the second refrigeration circuit set by a user. And when the first temperature value is higher than the first set temperature value and/or the second temperature value is higher than the second set temperature value within the preset time, controlling the refrigerating time length and the refrigerating interval in the second refrigerating loop according to the preset refrigerating priority of the task control logic. In this embodiment, the second refrigeration circuit is controlled to allow the refrigerant to flow to the first refrigeration circuit more, so as to ensure that the room temperature corresponding to the first refrigeration circuit satisfies the product storage environment. Optionally, the preset time duration is at least 1 minute in duration.
In step S105, controlling the cooling time and the cooling interval in the second cooling circuit according to the cooling priority of the preset task control logic, specifically including:
and when the task control logic does not have the refrigeration priorities of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, limiting the refrigeration duration and the refrigeration interval of the second refrigeration circuit. In this embodiment, when the first temperature value is higher than the first set temperature value and/or the second temperature value is higher than the second set temperature value, the task control logic is triggered, and the controller controls (including cooling, standby, and shutdown) the first cooling circuit and the second cooling circuit according to the task control logic. Specifically, the first temperature value in the first refrigeration loop is not more than a first set temperature value or is recovered to the first set temperature value as soon as possible through the regulation and control of the controller, or the second temperature value in the second refrigeration loop is not more than a second set temperature value or is recovered to the second set temperature value as soon as possible, so that the temperature in the greenhouses corresponding to the first refrigeration loop and the second refrigeration loop is accurately controlled, and the temperature control of users on different greenhouses is met.
When the difference value between the first temperature value and the first set temperature value is increased, the operation time length of the second refrigeration loop is controlled to be shortened, the operation frequency is controlled to be reduced, the refrigeration time of the second refrigeration loop is shortened, the refrigeration interval is prolonged, and therefore the cold air volume of the first refrigeration loop can be preferentially guaranteed. In this embodiment, it is necessary to ensure the temperature in the greenhouse in which the first refrigeration circuit is located.
In step S105, controlling the cooling time and the cooling interval in the second cooling circuit according to the cooling priority of the preset task control logic, specifically including:
when the task control logic sets the refrigeration priority of the second refrigeration loop, the operation time length of the second refrigeration loop is increased and the operation frequency is shortened, so that the second temperature value in the second refrigeration loop does not exceed the second set temperature value or is recovered to the second set temperature value as soon as possible. In the embodiment, according to the refrigeration priority of the task control logic, the temperature in the second refrigeration loop is preferentially ensured to reach the set temperature value, and then the first refrigeration loop is satisfied to reach the first set temperature value.
When the difference value between the second temperature value and the second set temperature value is increased, the operation time length of the second refrigeration loop is controlled to be increased, the operation frequency is controlled to be increased, the refrigeration time length of the second refrigeration loop is increased, the refrigeration interval is shortened, and therefore the cold air quantity of the second refrigeration loop can be preferentially guaranteed.
Further, the temperature control method of the refrigerating unit further comprises the following steps: when the task control logic does not have the refrigeration priority of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, the task control logic exits when the first temperature value is not greater than the first set temperature value or any refrigeration circuit in the first refrigeration circuit and the second refrigeration circuit stops operating.
Further, the temperature control method of the refrigerating unit further comprises the following steps: when the refrigeration priority of the second refrigeration loop is set, when the second temperature value is not greater than the second set temperature value, or any refrigeration loop in the first refrigeration loop and the second refrigeration loop stops running, the task control logic exits.
The temperature control method of the refrigerating unit controls the running state of the second refrigerating circuit according to the difference value between the detected temperature and the set temperature of the first refrigerating circuit and the second refrigerating circuit through the preset task logic control, so that the use requirements of users on greenhouses corresponding to the first refrigerating circuit and the second refrigerating circuit can be met.
As shown in fig. 2, according to another aspect of the embodiment of the present invention, there is also provided a refrigeration unit 100, in which the temperature control method of the refrigeration unit is applied to the refrigeration unit 100 of the embodiment, the refrigeration unit 100 includes: a controller (not shown), a condenser 12, and a first refrigeration circuit and a second refrigeration circuit connected to the condenser 12, respectively. Of course, the refrigeration unit 100 of the present invention is not limited to the above components, and the refrigeration unit 100 may further include one or more of a compressor 11, an inverter, a gas-liquid separator, a valve, and the like. The control logic of the controller may be logic control inside the frequency converter.
The first refrigeration circuit and the second refrigeration circuit are connected in parallel and are respectively connected to the controller and the condenser 12. In an alternative embodiment of the present invention, the first refrigeration circuit is a freezing refrigeration circuit and the second refrigeration circuit is a refrigerating refrigeration circuit.
The first refrigeration circuit includes a first evaporator 13, a first temperature sensor 14 provided at a return air inlet of the first evaporator 13, and a first solenoid valve 15. The first evaporator 13 is used for refrigerating a greenhouse in which the first refrigeration circuit is located, the first temperature sensor 14 is used for acquiring a real-time temperature value of a temperature zone in which the first refrigeration circuit is located, and the first electromagnetic valve 15 is used for controlling the first refrigeration circuit to refrigerate, stand-by or shut down.
The second refrigeration circuit includes a second evaporator 16, a second temperature sensor 17 provided at a return air inlet of the second evaporator 16, and a second solenoid valve 18. The second evaporator 18 is used for refrigerating a greenhouse in which the second refrigeration circuit is located, the second temperature sensor 17 is used for acquiring a real-time temperature value of a temperature zone in which the second refrigeration circuit is located, and the second electromagnetic valve 18 is used for controlling the second refrigeration circuit to refrigerate, stand-by or shut down.
The controller obtains a first temperature value through the first temperature sensor 14 and a second temperature value through the second temperature sensor 17. And when the first temperature value is higher than the first set temperature value and/or the second temperature is higher than the second set temperature value within the preset time, the controller controls the refrigerating time length and the refrigerating interval in the second refrigerating loop through the valve according to the refrigerating priority of the preset task control logic.
In an alternative embodiment, when the task control logic does not have the refrigeration priorities of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, the controller limits the refrigeration duration and the refrigeration interval of the second refrigeration circuit so that the first temperature value in the first refrigeration circuit does not exceed the first set temperature value. In this embodiment, when the difference between the first temperature value and the first set temperature value increases, the controller controls the operation time of the second refrigeration circuit to decrease and the operation frequency to decrease.
In yet another alternative embodiment, when the task control logic sets the refrigeration priority of the second refrigeration circuit, the controller controls the second refrigeration circuit to increase the operation time and decrease the operation frequency so that the second temperature value in the second refrigeration circuit does not exceed the second set temperature value. When the difference value between the second temperature value and the second set temperature value is increased, the controller controls the operation time length of the second refrigeration loop to be increased and the operation frequency to be increased.
Further, when the task control logic does not have the refrigeration priority of the first refrigeration circuit and the second refrigeration circuit, or the refrigeration priority of the first refrigeration circuit is set, when the first temperature value is not greater than the first set temperature value, or any one of the first refrigeration circuit and the second refrigeration circuit stops operating, the task control logic exits, that is, the controller does not need to control the first refrigeration circuit and the second refrigeration circuit at this time.
Further, when the refrigeration priority of the second refrigeration loop is set, when the second temperature value is not greater than the second set temperature value, or when any refrigeration loop of the first refrigeration loop and the second refrigeration loop stops operating, the task control logic exits, that is, the controller does not need to control the first refrigeration loop and the second refrigeration loop at this time.
The temperature control method of the refrigerating unit and the refrigerating unit control the operation state of the second refrigerating circuit according to the difference value between the detected temperature and the set temperature of the first refrigerating circuit and the second refrigerating circuit through the preset task logic control, so that the use requirements of users on greenhouses corresponding to the first refrigerating circuit and the second refrigerating circuit can be met. The invention adds task control logic in the controller, does not need to add new electronic components, reduces fault points, has unchanged cost and high overall reliability, and has simple and easy-to-implement control mode.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for controlling the temperature of a refrigeration unit comprising a first refrigeration circuit and a second refrigeration circuit, characterized in that it comprises:
presetting a first set temperature value of the first refrigeration loop and a second set temperature value of the second refrigeration loop;
acquiring a first temperature value of the first refrigeration loop and a second temperature value of the second refrigeration loop;
and when the first temperature value is higher than the first set temperature value and/or the second temperature value is higher than the second set temperature value within the preset time, the first set temperature value is lower than the second set temperature value, and the refrigerating time and the refrigerating interval in the second refrigerating loop are controlled according to the refrigerating priority of the preset task control logic, so that more refrigerant can flow to the first refrigerating loop.
2. The method of claim 1, wherein controlling the duration and interval of cooling in the second refrigeration circuit according to the priority of cooling by the preset mission control logic comprises:
when the task control logic does not have the refrigeration priorities of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, limiting the refrigeration duration and the refrigeration interval of the second refrigeration circuit so as to enable the first temperature value in the first refrigeration circuit not to exceed the first set temperature value.
3. The temperature control method according to claim 2, wherein when the difference between the first temperature value and the first set temperature value increases, the operation time period of the second refrigeration circuit is controlled to decrease and the operation frequency is controlled to decrease.
4. The method of claim 1, wherein controlling the duration and interval of cooling in the second refrigeration circuit according to the priority of cooling by the preset mission control logic comprises:
and when the task control logic sets the refrigeration priority of the second refrigeration loop, increasing the operation time length of the second refrigeration loop and shortening the operation frequency so as to enable the second temperature value in the second refrigeration loop not to exceed the second set temperature value.
5. The temperature control method according to claim 4, wherein when the difference between the second temperature value and the second set temperature value is increased, the operating time period of the second refrigeration circuit is controlled to be increased and the operating frequency is controlled to be increased.
6. The temperature control method according to claim 1, further comprising:
and when the task control logic does not have the refrigeration priority of the first refrigeration circuit and the second refrigeration circuit or sets the refrigeration priority of the first refrigeration circuit, the task control logic exits when the first temperature value is not greater than the first set temperature value or any refrigeration circuit in the first refrigeration circuit and the second refrigeration circuit stops running.
7. The temperature control method according to claim 1, further comprising:
and when the refrigeration priority of the second refrigeration loop is set, when the second temperature value is not greater than the second set temperature value, or when any refrigeration loop of the first refrigeration loop and the second refrigeration loop stops running, the task control logic exits.
8. The temperature control method according to any one of claims 1 to 7, wherein the first refrigeration circuit is a freezing refrigeration circuit and the second refrigeration circuit is a refrigerating refrigeration circuit.
9. A refrigeration unit, comprising: the controller is used for controlling the condenser, and the first refrigeration circuit and the second refrigeration circuit are respectively connected with the condenser;
the first refrigeration loop comprises a first evaporator, a first temperature sensor and a first electromagnetic valve, the first temperature sensor is arranged at a return air inlet of the first evaporator, and the second refrigeration loop comprises a second evaporator, a second temperature sensor and a second electromagnetic valve, the second temperature sensor is arranged at a return air inlet of the second evaporator;
the controller acquires a first temperature value through the first temperature sensor and acquires a second temperature value through the second temperature sensor;
when the first temperature value is higher than a first set temperature value preset by the first refrigeration loop and/or the second temperature value is higher than a second set temperature value preset by the second refrigeration loop within a preset time, the first set temperature value is smaller than the second set temperature value, and the controller controls the refrigeration duration and the refrigeration interval in the second refrigeration loop through the second electromagnetic valve according to the refrigeration priority of the preset task control logic, so that the refrigerant can flow to the first refrigeration loop more.
10. The refrigeration unit as set forth in claim 9 wherein said first refrigeration circuit is a refrigeration circuit and said second refrigeration circuit is a refrigeration circuit.
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Effective date of registration: 20200330 Address after: 200336 unit 02, 10 / F, No. 99, Xianxia Road, Changning District, Shanghai Patentee after: Lengwang (Shanghai) Industrial Co., Ltd Address before: Wujiang Economic Development Zone, Suzhou City, Jiangsu province 215200 Pang Jin Road No. 2333 Patentee before: INGERSOLL RAND (CHINA) INDUSTRIAL EQUIPMENT MANUFACTURING Co.,Ltd. |