Air conditioner

Abstract

The air conditioner comprises an air conditioner body, a motor and a motor cooling loop, the air conditioner body comprises a heat exchanger and a heat transfer loop, the heat transfer loop is arranged on the heat exchanger and used for transferring heat, the motor is connected with the air conditioner body, and the motor cooling loop is arranged on the motor and communicates with the heat transfer loop. And the motor is cooled by using the chilled water in the heat transfer loop. The motor cooling loop is arranged on the motor, and the chilled water in the heat transfer loop of the air conditioner body is used for cooling the motor, so that the motor can be cooled without additionally arranging an extra cold source. The chilled water in the heat transfer loop is used for heat dissipation, and the heat dissipation efficiency of the motor is improved while the operation efficiency of the air conditioner is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioner. Background Art

[0002] With the current pace of technological advancement, air conditioning technologies capable of regulating ambient temperature are increasingly being developed to improve people's quality of life, providing users with a more comfortable environment. For example, modular air handling units (CAMs), a type of air conditioning equipment, are widely used in shopping malls, hotels, rail transit, and other places. They circulate and process air, heating, cooling, purifying, or blowing air according to user needs, enhancing user comfort.

[0003] Air conditioners typically use a motor-driven fan to generate high-speed airflow. When the air conditioner is turned on, the motor begins to operate. As the motor runs longer, it accumulates heat, necessitating heat dissipation. Traditional cooling methods use specialized fans for air cooling. However, this is ineffective for long-running motors, preventing them from cooling effectively and efficiently. Utility Model Content

[0004] Based on this, it is necessary to provide an air conditioner that can effectively cool the motor in order to solve the above technical problems.

[0005] An air conditioner includes an air conditioner body, a motor and a motor cooling circuit. The air conditioner body includes a heat exchanger and a heat transfer circuit. The heat transfer circuit is arranged on the heat exchanger and is used to transfer heat. The motor is connected to the air conditioner body. The motor cooling circuit is arranged on the motor and is connected to the heat transfer circuit and is used to use the chilled water in the heat transfer circuit to cool the motor.

[0006] In one embodiment, the motor cooling circuit includes an opening water pump, which is arranged in a pipeline of the motor cooling circuit and is used to adjust the flow rate of the chilled water in the motor cooling circuit.

[0007] In one embodiment, the motor cooling circuit includes a flow control valve, which is arranged at a common end point where the pipelines of the heat transfer circuit and the motor cooling circuit are connected, and the flow control valve is used to control the flow direction of the chilled water in the motor cooling circuit.

[0008] In one embodiment, the flow control valve is a four-way reversing valve, the heat transfer circuit includes a water inlet manifold and a return water manifold, the motor cooling circuit also includes a motor water inlet pipe and a motor return water pipe, the water inlet manifold, the return water manifold, the motor water inlet pipe and the motor return water pipe all converge at the common end point, and the four-way reversing valve is arranged at the common end point.

[0009] In one embodiment, the motor cooling circuit includes more than two cooling branches, and each cooling branch is connected to the heat transfer circuit.

[0010] In one embodiment, the motor cooling circuit further includes two or more circuit control valves, the number of the circuit control valves matches the number of the cooling branches, and each circuit control valve is respectively arranged in a different cooling branch.

[0011] In one embodiment, the invention further comprises a circumferential spiral water pipe arranged around the motor, and each cooling branch is arranged on the motor and communicated with the circumferential spiral water pipe.

[0012] In one embodiment, the pipeline of the heat transfer circuit is provided with a connecting hole, and the motor cooling circuit is connected to the heat transfer circuit through the connecting hole.

[0013] In one embodiment, the air conditioner further includes a temperature detection device. There are multiple temperature detection devices, which are respectively arranged in the heat transfer circuit, the motor, and the motor cooling circuit.

[0014] In one embodiment, the motor is a magnetic levitation motor.

[0015] The air conditioner comprises an air conditioner body, a motor, and a motor cooling circuit. The air conditioner body includes a heat exchanger and a heat transfer circuit. The heat transfer circuit is disposed in the heat exchanger and is used to transfer heat. The motor is connected to the air conditioner body. The motor cooling circuit is disposed in the motor and communicates with the heat transfer circuit, and is used to cool the motor using the chilled water in the heat transfer circuit. By distributing the motor cooling circuit in the motor and using the chilled water in the heat transfer circuit of the air conditioner body to cool the motor, the motor can be cooled without the need for an additional cooling source. By utilizing the chilled water in the heat transfer circuit to dissipate heat, the motor's heat dissipation efficiency is improved while maintaining the air conditioner's operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural block diagram of an air conditioner in one embodiment;

[0017] Figure 2 is a structural block diagram of an air conditioner in another embodiment;

[0018] Figure 3 is a partial schematic diagram of an air conditioner in one embodiment;

[0019] Figure 4 Schematic diagram of an application of a motor cooling circuit in one embodiment;

[0020] Figure 5 This is a schematic diagram of an application of a motor cooling circuit in another embodiment;

[0021] Figure 6 Schematic diagram of the structure of a combined air handling unit in one embodiment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0024] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0025] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0027] A modular air handling unit (AHU), commonly known as an air conditioner, is a type of air conditioning equipment commonly used in shopping malls, hotels, and rail transit systems, where high airflow is required for extended periods. Typically, a modular AHU is installed in a sealed modular box on the lowest floor of a building. The fan section within the modular box processes return air to the surface cooling section for air conditioning, achieving air conditioning.

[0028] However, due to the limited space in the box and the unidirectional air flow, it is difficult to effectively cool down the motor of the combined air handling unit through air cooling. Correspondingly, the motor accumulates heat due to continuous operation, which will affect the operation of the motor due to long-term high-temperature operation. In severe cases, it may cause the combined air handling unit to stop operating.

[0029] In order to improve the heat dissipation efficiency, in one embodiment, Figure 1 As shown, this embodiment provides an air conditioner, which includes an air conditioner body, a motor and a motor cooling circuit. The air conditioner body includes a heat exchanger and a heat transfer circuit. The heat transfer circuit is arranged on the heat exchanger for transferring heat. The motor is connected to the air conditioner body. The motor cooling circuit is arranged on the motor and is connected to the heat transfer circuit for using the chilled water in the heat transfer circuit to cool the motor.

[0030] The air conditioner itself includes most of the components needed to perform cooling and heating functions. The motor drives some of these components, serving as the foundation for these functions. The motor activates the air conditioner, generating driving force that is transmitted to the corresponding components within the unit, collaboratively achieving air conditioning. Because the motor tends to accumulate heat during use, causing it to heat up, a motor cooling circuit is incorporated to keep it cool.

[0031] In the air conditioner, the heat transfer circuit is the circuit that regulates the air temperature. Chilled water flows through it, enabling the coordinated operation of components within the air conditioner, such as the compressor, condenser, and evaporator. The chilled water circulates through the heat transfer circuit, driving heat transfer and completing the air conditioning function. The heat exchanger, a device that achieves this heat transfer, has excellent thermal conductivity and can release the heat carried by the chilled water, serving as a heat source for other components within the air conditioner, thereby enabling the air conditioner to regulate the air temperature.

[0032] Correspondingly, the motor cooling circuit is a loop pipe used to cool the motor. In this embodiment, the pipes of the motor cooling circuit are connected to the pipes of the heat transfer circuit. When the chilled water in the heat transfer circuit flows through the pipes, it can flow from the heat transfer circuit into the motor cooling circuit to cool the motor. Chilled water is a liquid that easily removes and transfers heat. It can flow through the heat transfer circuit and the motor cooling circuit, removing heat dissipated by the motor as it flows through the motor cooling circuit, thereby cooling the motor.

[0033] The motor cooling circuit is connected to the heat transfer circuit. At the connection point between the two, the motor cooling circuit needs to be provided with two pipes as flow channels for chilled water, so that chilled water can enter the motor cooling circuit from the heat transfer circuit, and chilled water can return from the motor cooling circuit to the heat transfer circuit. Therefore, the two pipes in the motor cooling circuit that are directly connected to the heat transfer circuit are respectively called the motor water inlet pipe and the motor water return pipe. Furthermore, there are different pipes in the heat transfer circuit. In order to facilitate the flow of chilled water in the motor cooling circuit, a water inlet manifold and a water return manifold are provided in the heat transfer circuit. The chilled water first flows through the water inlet manifold in the heat transfer circuit, then flows through the motor water inlet pipe of the motor cooling circuit, and flows out of the motor water return pipe of the motor cooling circuit to the water return manifold of the heat transfer circuit.

[0034] The air conditioner comprises an air conditioner body, a motor, and a motor cooling circuit. The air conditioner body includes a heat exchanger and a heat transfer circuit. The heat transfer circuit is disposed in the heat exchanger and is used to transfer heat. The motor is connected to the air conditioner body. The motor cooling circuit is disposed in the motor and communicates with the heat transfer circuit, and is used to cool the motor using the chilled water in the heat transfer circuit. By dissipating the motor cooling circuit within the motor and using the chilled water in the heat transfer circuit of the air conditioner body to cool the motor, the motor can be cooled without the need for an additional cooling source. By utilizing the chilled water in the heat transfer circuit to dissipate heat from the motor, the motor's heat dissipation efficiency is improved while maintaining the air conditioner's operating efficiency.

[0035] For air conditioners like modular air handling units, the motor typically utilizes a pulley motor drive system, primarily used in the fan section of the unit. This system drives the dual-inlet centrifugal fan at high speeds under high static pressure, thereby achieving high air volume circulation and processing. However, due to friction between the belt and the pulley, pulley transmissions have lower transmission efficiency than direct bearing connections or gear drives, resulting in additional energy loss. Furthermore, as a consumable part, the belt requires regular inspection and replacement. This is especially true in air conditioners operating under adverse conditions, such as high temperature, high humidity, or the presence of corrosive gases. The belt's service life can be significantly shortened, increasing maintenance frequency and costs. Therefore, in one embodiment, the motor is a magnetic levitation motor. Magnetic levitation motors utilize magnetic bearings, eliminating any mechanical contact between the stator and the rotor, significantly reducing operating noise, while also offering energy-saving, high efficiency, and high system durability. Furthermore, the core of magnetic levitation motors is controlling the current and temperature of the electromagnetic coil to ensure rotor levitation. Therefore, magnetic levitation motors place even higher and more stringent cooling requirements.

[0036] In one embodiment, Figure 2 As shown, the motor cooling circuit includes an opening water pump, which is arranged in the pipeline of the motor cooling circuit and is used to adjust the flow rate of the chilled water in the motor cooling circuit.

[0037] An opening pump is a pump with adjustable opening. As the opening changes, the pump's driving speed (or flow rate) of the liquid it contacts changes. In this embodiment, the opening pump is installed within the motor cooling circuit piping, driving the chilled water within the motor cooling circuit, changing the flow rate and, consequently, the flow rate of the chilled water.

[0038] Specifically, the opening water pump drives chilled water flowing from the heat transfer circuit into the motor cooling circuit, pumping the chilled water from the heat transfer circuit into the motor cooling circuit. The opening water pump has different pumping force levels, corresponding to the opening degree. As the opening degree of the opening water pump increases, the pumping force level for the chilled water increases, resulting in a faster flow rate and greater flow rate within the motor cooling circuit. Conversely, as the opening degree of the opening water pump decreases, the pumping force level for the chilled water decreases, resulting in a lower flow rate within the motor cooling circuit.

[0039] Optionally, the specific position of the opening water pump in the motor cooling circuit is not limited. It can be set at the common end point where the heat transfer circuit and the motor cooling circuit are connected, or it can be set at different positions in the pipeline of the motor cooling circuit. The opening water pump can realize the flow rate regulation of the chilled water in the motor cooling circuit. Exemplarily, the opening water pump can be a gear water pump, and the opening is adjusted according to the engagement or rotation degree of the gear. Furthermore, the number of the opening water pumps is not limited, and it can be one or more, and the corresponding setting position can also be a combination of different positions. For example, the number of the opening water pumps is two, which are respectively set in the motor water inlet pipe and the motor water return pipe in the motor cooling circuit. For example, the number of the opening water pump is one, such as Figure 2 As shown, a motor water inlet pipe or a motor water return pipe is arranged in the motor cooling circuit.

[0040] In this embodiment, a variable-speed water pump is installed within the motor cooling circuit pipeline to adjust the chilled water flow rate within the motor cooling circuit, adapting to different motor cooling requirements. Users can adjust the degree of the variable-speed water pump as needed, thereby adjusting the motor cooling efficiency, achieving precise cooling and improving the adaptability of the air conditioner.

[0041] In one embodiment, the motor cooling circuit includes a flow control valve, which is arranged at a common end point where the pipelines of the heat transfer circuit and the motor cooling circuit are connected, and the flow control valve is used to control the flow direction of the chilled water in the motor cooling circuit.

[0042] Specifically, a flow control valve is a valve that controls the flow direction of liquid in a connecting pipe. This flow control can be achieved by restricting connectivity or by adjusting the valve's operating state. In this embodiment, the flow control valve is located at the junction of the heat transfer circuit and the motor cooling circuit. This is where the heat transfer circuit pipes and the motor cooling circuit pipes connect, referred to as the common endpoint. The flow control valve controls the flow direction at the common endpoint, thereby controlling the flow direction of the chilled water within the motor cooling circuit.

[0043] Furthermore, when the air conditioner Figure 1 As shown, the flow control valve can be a one-way flow limiting valve, and there are two sets of flow control valves, each of which consists of two one-way valves, and the one-way valves in each set are set in opposite directions. One set of flow control valves is located in the motor water inlet pipe, and the other set of flow control valves is located in the motor water return pipe. The two sets of flow control valves work together to control the flow direction of chilled water in the motor cooling circuit. For example, if the one-way valve in the motor water inlet pipe that conducts the motor cooling circuit is opened, the one-way valve in the motor water return pipe that conducts the heat transfer circuit is opened, and the other two one-way valves are inoperative, the flow direction of chilled water in the motor cooling circuit is now flowing into the motor water inlet pipe and out of the motor water return pipe. In another case, if the one-way valve in the motor water return pipe that conducts the motor cooling circuit is opened, the one-way valve in the motor water inlet pipe that conducts the heat transfer circuit is opened, and the other two one-way valves are inoperative, the flow direction of chilled water in the motor cooling circuit is now flowing into the motor water return pipe and out of the motor water inlet pipe.

[0044] The flow control valve may also be a valve of other types. In one embodiment, the flow control valve is a four-way reversing valve. The heat transfer circuit includes a water inlet manifold and a water return manifold. The motor cooling circuit also includes a motor water inlet pipe and a motor water return pipe. The water inlet manifold, the water return manifold, the motor water inlet pipe, and the motor water return pipe all converge at a common endpoint. The four-way reversing valve is disposed at the common endpoint.

[0045] It should be noted that in the aforementioned embodiment, there are two common endpoints, one of which is located at the connection point between the water inlet manifold and the motor water inlet pipe, and the other is located at the connection point between the water return manifold and the motor water return pipe. In this embodiment, however, there is only one common endpoint, which is located at the connection point between the water inlet manifold, the water return manifold, the motor water inlet pipe, and the motor water return pipe. In this embodiment, unless otherwise specified, a common endpoint refers to a common endpoint where the water inlet manifold, the water return manifold, the motor water inlet pipe, and the motor water return pipe all intersect and connect, such as Figure 3 As shown. And Figure 3 The motor includes a housing, and a part of the motor cooling circuit is arranged under the housing of the motor, which is not shown in the figure.

[0046] Specifically, see Figure 3 The inlet manifold of the heat transfer circuit leads to a branch pipe connected to a four-way reversing valve. The outlet manifold of the heat transfer circuit leads to a branch pipe connected to a four-way reversing valve. The motor return pipe and the motor inlet pipe are both connected to the four-way reversing valve. Since the flow direction of the chilled water in the heat transfer circuit is fixed, the four-way reversing valve can switch the connected pipes according to demand, thereby controlling the flow direction of the chilled water in the motor cooling circuit. For example, when the four-way reversing valve controls the inlet manifold to connect to the motor inlet pipe, and the return manifold to connect to the motor return pipe, the chilled water flow direction in the motor cooling circuit is from the motor inlet pipe to the motor return pipe. When the four-way reversing valve controls the inlet manifold to connect to the motor return pipe, and the return manifold to connect to the motor inlet pipe, the chilled water flow direction in the motor cooling circuit is from the motor return pipe to the motor inlet pipe.

[0047] Furthermore, the opening water pump in the motor cooling circuit can be a gear water pump, which can be arranged in the motor water inlet pipe of the motor cooling circuit, or in the branch pipe led out from the water inlet manifold of the heat transfer circuit, or in the motor return pipe of the motor cooling circuit, or in the branch pipe connected to the motor return pipe, which merges into the return manifold of the heat transfer circuit.

[0048] In this embodiment, a four-way reversing valve is provided at the common end point where the heat transfer circuit is connected to the motor cooling circuit, which can adjust the flow direction of the chilled water in the motor cooling circuit, make full use of the temperature difference of the chilled water between the inlet manifold and the return manifold in the heat transfer circuit, and achieve different cooling effects for the motor. It can match the cooling with the different heat accumulation conditions of the motor, which is beneficial to ensure the temperature stability of the motor and increase the working reliability of the air conditioner.

[0049] In one embodiment, the heat transfer circuit's pipeline is provided with a connection hole, and the motor cooling circuit is connected to the heat transfer circuit through the connection hole. Because the motor cooling circuit uses the heat transfer circuit's chilled water as a medium for cooling the motor, it is necessary to add a connection point to the original heat transfer circuit for connecting to the motor cooling circuit. The heat transfer circuit's pipeline is provided with a connection hole, and the motor cooling circuit is connected to the heat transfer circuit through the provided connection hole to ensure smooth flow of chilled water.

[0050] Furthermore, the pipelines of the heat transfer circuit include an inlet manifold and a return manifold, with the inlet manifold connected to the motor inlet pipe of the motor cooling circuit, and the return manifold connected to the motor return pipe of the motor cooling circuit. Both the inlet and return manifolds of the heat transfer circuit are provided with openings. Accordingly, the motor inlet pipe communicates with the inlet manifold through the connection openings on the inlet manifold, and the motor return manifold communicates with the return manifold through the connection openings on the return manifold. Optionally, the connection openings can be provided at the bottom of the heat transfer circuit, leveraging gravitational potential energy to provide a certain pressure, thereby facilitating the equalization of chilled water flow through the pipeline pressure.

[0051] In one embodiment, the motor cooling circuit includes more than two cooling branches, and each cooling branch is connected to the heat transfer circuit.

[0052] The pipeline composition of the motor cooling circuit can be set according to demand, that is, the motor cooling circuit can include a pipe of uniform thickness, or it can include a network of pipes distributed in the form of a capillary network. In this embodiment, the motor cooling circuit includes two or more cooling branches, each of which is connected to the heat transfer circuit, wherein one end of each cooling branch converges to the motor water inlet pipe, which is connected to the water inlet manifold of the heat transfer circuit through the motor water inlet pipe, and the other end of each cooling branch converges to the motor return pipe, which is connected to the return manifold of the heat transfer circuit through the motor return pipe. Specifically, each cooling branch is evenly laid on the surface of the motor, and chilled water flows inside each cooling branch to fully exchange heat with the motor, thereby cooling the motor.

[0053] Each cooling branch in the motor cooling circuit can cool the motor separately, and the user can control the operating status of the cooling branch as needed. In one embodiment, the motor cooling circuit also includes two or more circuit control valves, the number of circuit control valves matching the number of cooling branches, and each circuit control valve is respectively installed in a different cooling branch.

[0054] Specifically, each cooling branch is equipped with at least one circuit control valve, which controls the flow of chilled water within the cooling branch. When the circuit control valve is open, the chilled water within the cooling branch can flow freely; when the circuit control valve is closed, the chilled water within the cooling branch cannot flow, effectively shutting down the cooling branch. Furthermore, if the motor cooling circuit also includes a flow direction control valve, when the circuit control valve is open, the flow direction of the chilled water within the cooling branch is determined by the flow direction control valve.

[0055] On this basis, in order to better cool the motor, each cooling branch, in one embodiment, the air conditioner also includes a circumferential spiral water pipe arranged around the motor, and each cooling branch is arranged on the motor and is connected to the circumferential spiral water pipe.

[0056] Among them, the circumferential spiral water pipe is a spirally grooved pipe, a double-sided enhanced heat exchange pipe with excellent heat transfer performance, which significantly enhances the heat exchange process of the single-phase fluid in the pipe. The inner wall of the circumferential spiral water pipe is provided with spiral grooves, so that part of the fluid is guided by the spiral grooves when flowing in the pipe, and the part of the fluid close to the wall rotates along the groove; when the other part of the fluid flows axially along the wall, the spiral protrusions also cause periodic disturbances in the fluid. The former effect is conducive to thinning the fluid boundary layer; the latter effect causes disturbances in the fluid mass in the boundary layer, thereby accelerating the heat transfer from the wall to the main body of the fluid. The combined effect of the two effects enhances the heat exchange effect in the pipe.

[0057] Specifically, the circumferential spiral water pipe is arranged around the motor, fitted to the surface of the motor, or arranged under the motor casing, reducing the distance from the motor's stator, rotor, coil, and other heat-generating components, thereby further improving the heat dissipation efficiency. Furthermore, the number of circumferential spiral water pipes can match the number of cooling branches, and each cooling branch is connected to a circumferential spiral water pipe. Alternatively, the cooling branch pipe can also be a circumferential spiral water pipe, with the cooling branch partially surrounding the motor and the circumferential spiral water pipe surrounding the other part. In this case, the cooling branches can also directly surround the motor and cool the motor.

[0058] For example, Figure 4 As shown, there are two circumferential spiral water pipes, which are spirally wound in parallel around the motor surface, ensuring full contact with the motor. To distinguish between the two circumferential spiral water pipes, they are labeled as the first layer of circumferential spiral water pipes and the second layer of circumferential spiral water pipes, forming a double layer of circumferential spiral water pipes. The motor water inlet pipe is connected to two cooling branches (not shown in the figure), and the two cooling branches are connected to the two circumferential spiral water pipes respectively, completing the motor cooling circuit and facilitating the flow of chilled water within the circuit.

[0059] In one embodiment, the air conditioner further includes a temperature detection device, and the number of the temperature detection devices is multiple and respectively arranged in the heat transfer circuit, the motor and the motor cooling circuit.

[0060] The temperature detection device refers to a device that can detect temperature, including but not limited to temperature sensors, temperature sensing packages, thermometers and other types of temperature sensing elements. In this embodiment, there are multiple temperature detection devices, and they are respectively arranged in the heat transfer circuit, the motor and the motor cooling circuit, and can detect the temperatures of the heat transfer circuit, the motor and the motor cooling circuit. Optionally, the temperature detection device can be arranged on the side of the heat transfer circuit close to the heat exchanger, or on the surface of the motor, or at a position in the motor cooling circuit that is connected to the heat transfer circuit. In this embodiment, the specific location of the temperature detection device is not limited, and it can be adjusted accordingly according to the different structural settings of the heat transfer circuit, the motor and the motor cooling circuit to ensure that the temperature detected by the temperature detection device is accurate.

[0061] For example, Figure 5 As shown, the temperature detection device installed in the motor is a temperature sensing package, which can be installed inside the motor, outside the motor, or both. The temperature detection device installed in the motor cooling circuit is a temperature sensing package, which is installed on the side of the motor cooling circuit near the motor return pipe to detect the cooling water outlet temperature parameters of the motor cooling circuit. The temperature detection device installed in the heat transfer circuit is a temperature sensing package, not shown in the figure, which can be installed on the return water manifold of the heat transfer circuit to detect the heat exchanger temperature parameters, which is equivalent to the return water temperature of the heat exchanger unit of the air conditioner.

[0062] In this embodiment, by installing temperature detection devices in the heat transfer circuit, the motor, and the motor cooling circuit, the temperatures of these circuits can be monitored in a timely manner, thereby promptly detecting the cooling status of the motor. This facilitates user understanding of the cooling status of the motor, reduces safety hazards, facilitates maintaining stable and safe operation of the motor, and improves the reliability of the air conditioner.

[0063] In order to better understand the above solution, a detailed explanation is given below in conjunction with a specific embodiment.

[0064] In one embodiment, the air conditioner is a modular air handling unit, such as Figure 6 As shown, chilled water from the outdoor unit passes through the inlet and return manifolds of the surface cooling section (part of the heat transfer circuit), circulating within the heat exchanger. This water exchanges heat (cooling) with the air flowing over the heat exchanger surface, changing the air's temperature and humidity to achieve the desired air conditioning. In this embodiment, the air conditioner's motor is a magnetic levitation motor.

[0065] New holes are added to the inlet and return manifolds of the heat transfer circuit to serve as connection holes, connecting them to the motor cooling circuit for motor cooling. Optionally, these holes are located at the bottom of both manifolds to leverage the pressure from the existing manifolds for flow distribution of chilled water. The motor cooling circuit includes a motor inlet pipe and a gear water pump mounted thereon. The motor cooling circuit also includes a motor return pipe and a temperature sensor mounted thereon. A four-way reversing valve is also installed within the motor cooling circuit piping, connecting the motor inlet and return pipes. The valve controls the flow of chilled water within the motor cooling circuit.

[0066] One end of the motor water inlet pipe is connected to the water inlet manifold, and the other end is connected to the circumferential spiral water pipe inside the magnetic levitation motor (such as Figure 5 As shown), one end of the motor return water pipe is connected to the return water collection pipe, and the other end is connected to the circumferential spiral water pipe inside the magnetic levitation motor. At the same time, an inlet valve is also provided on the motor water inlet pipe. When the motor water inlet pipe is connected to multiple cooling branches, the motor cooling circuit also includes multiple inlet valves, which are respectively provided on each cooling branch. Furthermore, an outlet valve is also provided on the motor return water pipe. When the motor return water pipe is connected to multiple cooling branches, the motor cooling circuit may include multiple outlet valves or one outlet valve. The inlet and outlet valves are connected to the double-layer circumferential spiral water pipe inside the motor to ensure the circulation of cooling water. When there are two cooling branches, the first cooling branch is connected to the first layer of circumferential spiral water pipe through the first inlet valve, and the second cooling branch is connected to the second layer of circumferential spiral water pipe through the second inlet valve. The summary of each cooling branch is connected and discharged by the outlet valve.

[0067] In this embodiment, a portion of the chilled water is directly supplied to the motor cooling circuit via the inlet and return headers, while the majority of the chilled water is normally supplied to the heat exchanger for convective heat exchange in the unit's different operating modes. The motor inlet and return pipes communicate with the double-layer circumferential spiral water pipes installed within the motor. This allows the modular air handling unit to directly use chilled water from the surface cooling section as the cooling water source for the magnetic levitation motor in different operating modes, achieving both energy savings and precise temperature reduction.

[0068] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An air conditioner, characterized in that: The air conditioner includes an air conditioner body, a motor and a motor cooling circuit. The air conditioner body includes a heat exchanger and a heat transfer circuit. The heat transfer circuit is arranged on the heat exchanger for transferring heat. The motor is connected to the air conditioner body. The motor cooling circuit is arranged on the motor and is connected to the heat transfer circuit for using the chilled water in the heat transfer circuit to cool the motor.

2. The air conditioner according to claim 1, characterized in that The motor cooling circuit includes an opening water pump, which is arranged in a pipeline of the motor cooling circuit and is used to adjust the flow rate of the chilled water in the motor cooling circuit.

3. The air conditioner according to claim 1, characterized in that The motor cooling circuit includes a flow control valve, which is arranged at a common end point where the pipelines of the heat transfer circuit and the motor cooling circuit are connected. The flow control valve is used to control the flow direction of the chilled water in the motor cooling circuit.

4. The air conditioner according to claim 3, characterized in that The flow control valve is a four-way reversing valve, the heat transfer circuit includes a water inlet manifold and a return water manifold, the motor cooling circuit also includes a motor water inlet pipe and a motor return water pipe, the water inlet manifold, the return water manifold, the motor water inlet pipe and the motor return water pipe all converge at the common endpoint, and the four-way reversing valve is arranged at the common endpoint.

5. The air conditioner according to claim 1, characterized in that The motor cooling circuit includes more than two cooling branches, and each of the cooling branches is connected to the heat transfer circuit.

6. The air conditioner according to claim 5, characterized in that The motor cooling circuit further includes two or more circuit control valves, the number of the circuit control valves matches the number of the cooling branches, and each circuit control valve is respectively arranged in a different cooling branch.

7. The air conditioner according to claim 5, characterized in that It also includes a circumferential spiral water pipe arranged around the motor, and each cooling branch is arranged on the motor and communicated with the circumferential spiral water pipe.

8. The air conditioner according to claim 1, characterized in that The pipeline of the heat transfer circuit is provided with a connecting hole, and the motor cooling circuit is communicated with the heat transfer circuit through the connecting hole.

9. The air conditioner according to claim 1, characterized in that The air conditioner further includes a temperature detection device. There are multiple temperature detection devices, which are respectively arranged in the heat transfer circuit, the motor and the motor cooling circuit.

10. The air conditioner according to any one of claims 1 to 9, characterized in that: The motor is a magnetic levitation motor.

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