CN219299517U - Scroll compressor and heat pump air conditioning system - Google Patents

Abstract

The embodiment of the application provides a scroll compressor and a heat pump air conditioning system. The scroll compressor includes: a housing; the fixed scroll and the movable scroll are arranged in the shell and form a compression cavity; a temperature detection unit disposed within the housing for determining a first temperature of refrigerant in the scroll compressor; and the control unit is arranged on the scroll compressor or outside the scroll compressor, and is in communication connection with the temperature detection unit so as to adjust the exhaust temperature of the scroll compressor according to the first temperature.

Description

Scroll compressor and heat pump air conditioning system

Technical Field

The application relates to the technical field of compressors, in particular to a scroll compressor and a heat pump air conditioning system.

Background

In order to improve the heating effect under the low-temperature condition, a heat pump air conditioning system with enhanced vapor injection is mostly adopted in the related art. In the system, part of the refrigerant flowing through the evaporator enters the compression cavity of the compressor through the intermediate injection passage, is mixed with the refrigerant sucked from the air inlet, compresses the mixed refrigerant and then discharges the mixed refrigerant from the air outlet, so that the enthalpy of the refrigerant is increased, and the energy efficiency of the system is improved.

When the above system is in operation, it is necessary to control the temperature of the refrigerant discharged from the compressor so as to avoid deformation of parts such as a scroll in the compressor and contact and abrasion of tips between the scrolls due to the deformation, which are caused by the excessively high temperature of the refrigerant, as much as possible. Meanwhile, the too high temperature of the refrigerant can also affect parts in the heat pump air conditioning system, for example, when the temperature exceeds the temperature limit of the four-way valve, the valve can be invalid, and the system operation is further affected.

In this system, the control of the refrigerant temperature can be achieved by controlling the intermediate injection amount, and in the prior art, when the intermediate injection amount is controlled, a temperature sensor is often used to measure the temperature of the compressor discharge pipe, and the intermediate injection amount of the compressor is adjusted according to the measured temperature.

The method has the problems that in a heat pump air conditioning system, a compressor is usually arranged outdoors, the temperature at an exhaust pipe is easily influenced by the environmental temperature, for example, under extremely cold conditions, the data acquired by a temperature sensor can be far smaller than the temperature of a refrigerant in the exhaust pipe; on the other hand, in some cases, for example, after the refrigerant in the heat pump air conditioning system leaks, the refrigerant flow rate is low, so that the temperature of the compression chamber is already high, and the temperature of the discharge pipe is not high, which would cause damage to the compressor if the air injection amount is not adjusted. Therefore, how to precisely control the wet spraying and the liquid spraying of the compressor becomes a problem to be solved.

Disclosure of Invention

The application provides a scroll compressor and a heat pump air conditioning system. Various aspects related to embodiments of the present application are described below.

In a first aspect, there is provided a scroll compressor comprising: a housing; the fixed scroll and the movable scroll are arranged in the shell and form a compression cavity; a temperature detection unit disposed within the housing for determining a first temperature of refrigerant in the scroll compressor; and the control unit is arranged on the scroll compressor or outside the scroll compressor, and is in communication connection with the temperature detection unit so as to adjust the exhaust temperature of the scroll compressor according to the first temperature.

Optionally, the temperature detection unit is disposed on the fixed scroll.

Optionally, the fixed scroll comprises a discharge port, and the refrigerant compressed by the compression cavity flows to a discharge port of the scroll compressor through the discharge port; the temperature detection unit is disposed at a position close to the discharge port.

Optionally, the temperature detecting unit is disposed at a side close to the compression chamber.

In a second aspect, there is provided a heat pump air conditioning system comprising: a scroll compressor, a condenser, a first throttle valve, and an evaporator, which are sequentially communicated to form a circulation loop, and an intermediate injection passage connected between an outlet of the condenser and an intermediate injection port of the scroll compressor, wherein the intermediate injection passage is for injecting a refrigerant in a gaseous or liquid state into a compression chamber of the scroll compressor through the intermediate injection port, the scroll compressor comprising: a housing; the fixed scroll and the movable scroll are arranged in the shell and form the compression cavity; a temperature detection unit disposed within the housing for determining a first temperature of refrigerant in the scroll compressor; and the control unit is arranged on the scroll compressor or in a heat pump air conditioning system outside the scroll compressor, and is in communication connection with the temperature detection unit so as to control the injection quantity of the intermediate injection port according to the first temperature to adjust the exhaust temperature of the scroll compressor.

Optionally, the temperature detection unit is disposed on the fixed scroll.

Optionally, the fixed scroll comprises a discharge port, and the refrigerant compressed by the compression cavity flows to a discharge port of the scroll compressor through the discharge port; the temperature detection unit is disposed at a position close to the discharge port.

Optionally, the temperature detecting unit is disposed at a side close to the compression chamber.

Optionally, the intermediate injection passage is provided with a second throttle valve; the control unit adjusts the opening degree of the second throttle valve according to the first temperature so that the exhaust temperature is smaller than a preset threshold value.

Optionally, the control unit determines a target opening of the second throttle valve according to the first temperature and the preset threshold value by using a PID control algorithm, and adjusts the opening of the second throttle valve to the target opening so that the exhaust temperature is less than the preset threshold value.

According to the scroll compressor provided by the embodiment of the application, the temperature sensor is arranged in the compressor shell, so that the temperature of the refrigerant in the compression cavity is measured by the temperature sensor, and the middle injection quantity of the compressor is adjusted based on the temperature of the refrigerant in the compression cavity, so that the heat pump air conditioning system can have higher control precision under different working conditions; meanwhile, the failure of parts of the compressor and the heat pump air conditioning system caused by temperature detection misalignment in an extreme environment can be avoided.

Drawings

Fig. 1 is a schematic structural diagram of a heat pump air conditioning system provided in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a heat pump air conditioning system according to another embodiment of the present application.

Fig. 3 is a schematic structural diagram of a heat pump air conditioning system according to still another embodiment of the present application.

Fig. 4 is a schematic structural view of a scroll compressor provided in an embodiment of the present application.

Fig. 5 is a mating view of the fixed scroll wrap and the orbiting scroll wrap of fig. 4.

Fig. 6 is a bottom view of the non-orbiting scroll of fig. 4.

Fig. 7 is a partial view of the scroll compressor shown in fig. 4.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application.

The embodiment of the application provides a heat pump air conditioning system and a scroll compressor to solve the problems. The heat pump air conditioning system provided in the embodiments of the present application will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic block diagram of a heat pump air conditioning system according to an embodiment of the present application. The heat pump air conditioning system 10 in fig. 1 includes:

a scroll compressor 11, a condenser 12, a first throttle valve 13, an evaporator 14, and an intermediate injection passage 15. Wherein the scroll compressor 11 forms a closed circuit with the condenser 12, the first throttle valve 13 and the evaporator 14.

The operation of the heat pump air conditioning system will be described in detail below by taking the operation of the system as an example of a heating cycle.

The compressor 11 includes an intake port 111, an exhaust port 112, and an intermediate injection port 113. Wherein the air inlet 111 is connected to the outlet end of the evaporator 14 and the air outlet 112 is connected to the inlet end of the condenser 12. The refrigerant enters the compressor 11 through the inlet port 111, is compressed into a high-temperature and high-pressure gas state, is discharged from the outlet port 112, and flows to the condenser 12 through the closed pipe.

In the condenser 12, the high-temperature refrigerant exchanges heat with air or water. For example, a metal fin for heat radiation may be provided on the surface of the condenser 12, and the heat of the refrigerant is radiated through the metal fin, and a fan (for example, an axial flow fan) is provided on one side of the condenser, whereby the air at room temperature is driven by the fan and exchanges heat with the condenser 12, so that the air at room temperature is heated and discharged into the room, thereby realizing heating. Alternatively, as an implementation, a pipe for circulating the heat transfer medium is provided in the condenser 12. A heat transfer medium such as water or oil enters the condenser 12 from the water inlet, exchanges heat with the high-temperature and high-pressure refrigerant in the coil pipe of the condenser 12, is heated, and is discharged from the water outlet.

After heat exchange with a heat transfer medium such as air or water, the temperature of the refrigerant in the condenser 12 is reduced, and the refrigerant is converted from a high-temperature high-pressure gas state to a medium-temperature high-pressure liquid state, and flows into the first throttle valve 13 through the closed pipe.

In some embodiments, the first throttle valve 13 may be an expansion valve, acting as a throttle in the system. The liquid refrigerant of medium temperature and high pressure is changed into a liquid state of low temperature and low pressure after being throttled by the expansion valve.

In the evaporator 14, the low-temperature low-pressure liquid refrigerant absorbs heat and evaporates into a low-pressure gas state, and enters the compressor 11 from the intake port 111 of the compressor 11 to enter the next cycle.

The first end 151 of the intermediate injection passage 15 is connected to the outlet of the condenser 12, and the second end 152 is connected to the intermediate injection port of the scroll compressor 11 for injecting a relatively low temperature refrigerant into the compression chamber of the compressor 11 when the temperature of the refrigerant discharged from the compressor 11 is excessively high, to reduce the temperature of the refrigerant in the compression chamber of the compressor and after compression.

In some embodiments, the intermediate injection passage 15 of fig. 1 further includes a second throttle 152, which may be, for example, an expansion valve, for throttling the refrigerant in the passage.

The intermediate-temperature high-pressure liquid refrigerant at the outlet of the condenser 12 is throttled by the second throttle valve 152, is converted into a low-temperature low-pressure liquid state, enters the compression chamber of the compressor through the intermediate injection port 113, is mixed with the refrigerant in the compression chamber, is compressed again, and is discharged from the discharge port 112, which may be also referred to as spray.

Fig. 2 is a schematic block diagram of a heat pump air conditioning system 20 according to another embodiment of the present application.

The heat pump air conditioning system 20 shown in fig. 2 differs from the heat pump air conditioning system 10 in fig. 1 in that: an economizer 16 is also included in the heat pump air conditioning system 20. When passing through the first end of the intermediate injection passage 15, a part of the medium-temperature high-pressure liquid refrigerant flowing out of the condenser 12 flows to the intermediate injection passage, and this part of the refrigerant first passes through the second throttle valve 152, is converted from a gas state of medium-temperature high pressure to a liquid state of low-temperature low pressure by the second throttle valve 152, and flows to the economizer 16 in the intermediate injection passage 15.

The economizer 16 may also be referred to as an intermediate heat exchanger, and may be, for example, a corrugated plate heat exchanger or the like. The economizer 16 includes adjacent first and second fluid flow channels 161, 162, the first and second fluid flow channels 161, 162 being separated by a corrugated plate and conducting heat through an intermediate corrugated plate.

The first fluid flow path 161 is disposed in the main passage between the condenser 12 and the first throttle valve 13, that is, one end of the first fluid flow path 161 is connected to the condenser 12, and the other end is connected to the first throttle valve 13. The refrigerant flowing out of the condenser 12 may flow to the first throttle valve 13 through the first fluid flow passage 161. The second fluid flow path 161 is provided in the intermediate injection passage 15, and has one end connected to the output end of the second throttle valve 152 and the other end connected to the intermediate injection port 113 of the compressor 11.

In the economizer 16, the first fluid flow passage 161 exchanges heat with the refrigerant in the second fluid flow passage 162, so that the refrigerant at a low temperature and a low pressure in the second fluid flow passage 162 is heated to be supercooled, while the temperature of the refrigerant in the first fluid flow passage 161 is lowered to increase the supercooling degree.

The refrigerant flowing out of the intermediate injection passage 15 enters the compressor 11 through the intermediate injection port 113, is mixed with the refrigerant sucked from the intake port 111, and is compressed, and the cycle is performed. In the system shown in fig. 2, the mode of operation of the intermediate injection passage 15 may also be referred to as wet injection.

In the heat pump air conditioning system shown in fig. 2, the first section 151 of the intermediate injection passage 15 is provided on the outlet side of the first fluid flow passage 161 of the economizer 16. As another possible implementation manner, the first end 151 may also be disposed on the inlet side of the first fluid flow channel 161, as shown in fig. 3, and the operation is similar to that of fig. 2, which is not repeated herein.

Fig. 4 shows a schematic structural diagram of a scroll compressor 40 in an embodiment of the present application, which may be the compressor of any of the previous embodiments.

As will be described in detail below with reference to fig. 4, the scroll compressor 40 of fig. 4 includes:

a housing 41, a fixed scroll 42, a movable scroll 43, a piping system 44, a driving unit 45, a frame 46, and the like provided in the housing 41.

Wherein the housing 41 has a cylindrical shape for forming a cylindrical closed space of the scroll compressor to accommodate respective main components of the scroll compressor. In some embodiments, the housing 41 may be welded from an upper housing, a lower housing, and an intermediate housing.

The housing 41 is provided with an intake port 411, an exhaust port 412 and an intermediate injection port 413 for connection with an evaporator, a condenser and an intermediate injection passage outside the compressor, respectively.

The frame 46 is disposed in the inner cavity of the housing 41, and has an outer peripheral surface that is fitted to the inner peripheral surface of the housing 41 and fixedly connected to the housing 41.

The fixed scroll 42 is fixedly disposed in the inner cavity of the housing 41.

The driving unit 45 is fixed to the frame 46, and an output end thereof is connected to the movable scroll 43 to drive the movable scroll 43 to move relative to the fixed scroll 42.

Referring to fig. 5, a scroll 421 is formed on the fixed scroll 42, and is milled into a spiral shape, and a scroll 431 corresponding to the scroll 421 on the fixed scroll 42 is provided on the movable scroll 43, and the two scroll teeth are engaged with each other as shown in fig. 5 to form a series of crescent-shaped compression chambers.

When the scroll compressor is in operation, the driving unit 45 drives the movable scroll 43 to perform rotation translation without rotation relative to the fixed scroll 42 under the constraint of a cross mechanism (not shown), and the relative movement between the fixed scroll 42 and the movable scroll 43 causes the volume of the compression chamber to be continuously reduced in the movement process, so that the pressure in the crescent-shaped compression chamber is increased, and the refrigerant in the compression chamber is compressed.

Fig. 6 is a bottom view of the fixed scroll 42 in fig. 4, and the structure of the fixed scroll 42 in the embodiment of the present application will be described in detail with reference to fig. 6 and 4.

As shown in fig. 6, the fixed scroll 42 includes a main body 422 and spiral wraps 421 protruding from the surface of the main body 422. As previously described, the scroll wrap 421 is adapted to cooperate with the scroll wrap 431 on the orbiting scroll 43 to form a compression chamber.

A center hole 423 is provided at the center of the main body 422 of the fixed scroll 42 for communicating the compression chamber and the discharge chamber. The discharge chamber is a space (indicated by reference numeral 414 in fig. 4) formed by the upper surface of the main body 422 and the inner wall of the housing 41, and the compressed refrigerant enters the discharge chamber 414 through the central hole 423 and is discharged from the scroll compressor through the discharge port 412. Therefore, the center hole 423 may also be referred to as a discharge hole of the fixed scroll 42.

As shown in fig. 6, the fixed scroll 42 is further provided with a first main intake passage 424 and a first branch intake passage 425, one end of the first main intake passage 424 is connected to the intake port 411, and the other end is connected to the first branch intake passage 425; the end of the first branch intake passage 425 is provided with an opening 426 to the compression chamber so that the refrigerant can reach the opening 426 via the fluid passage formed by the intake port 411, the pipe 471, the first main intake passage 424, and the first branch intake passage 425, thereby supplying the refrigerant into the compression chamber.

As described above, a plurality of compression chambers are formed between the fixed scroll 42 and the movable scroll 43. Accordingly, a plurality of branch intake passages (e.g., branch intake passage 425-1 in fig. 6) and openings (e.g., opening 426-1 in fig. 6) corresponding thereto may be provided in the non-orbiting scroll 42, thereby enabling refrigerant to be delivered into each compression chamber to improve the compression efficiency of the compressor.

With continued reference to FIG. 6, the fixed scroll 42 further includes a second main intake passage 427 and second branch intake passages 428 and 428-1 arranged in a similar manner to the first main intake passage 424 and the first branch intake passage 425 described above, one end of the first main intake passage 424 being connected to the intermediate injection port 413, and the refrigerant being supplied to the compression chamber through a fluid passage formed by the intermediate injection port 413, the pipe, the second main intake passage 427 and the second branch intake passage 428 or 428-1 to the opening 429 or 429-1.

Referring back to fig. 4, the scroll compressor provided in the embodiment of the present application further includes a temperature detection unit 48, such as a temperature sensor. The temperature detection unit 48 is provided in the housing 41 of the compressor for determining a first temperature in the vicinity of the temperature detection unit. It should be understood that the location where the temperature detecting unit 48 is disposed is not particularly limited in this embodiment, for example, the temperature detecting unit 48 may be disposed in a high-pressure chamber formed by surrounding the inner surface of the housing and the upper surface of the fixed scroll 42, where the first temperature is the temperature in the high-pressure chamber, or the temperature detecting unit 48 may be disposed in the housing 41 near the exhaust port 412, where the first temperature is the temperature of the refrigerant flowing through the exhaust port 412.

In some embodiments, a temperature detection unit 48 is provided on the non-orbiting scroll to determine the temperature of the non-orbiting scroll; according to the temperature of the fixed scroll, whether the deformation of each part in the compressor is in an allowable range or not under the current working condition can be determined; meanwhile, the fixed scroll is usually made of metal materials such as steel and has good heat conductivity, so that the temperature of the fixed scroll can accurately reflect the temperature of the refrigerant in the compression cavity and the ambient temperature of the compression cavity.

Further, in some embodiments, referring to fig. 7, the temperature detecting unit 48 may be disposed at a side near the discharge hole 423 of the fixed scroll 42 so that the measured temperature is closer to the actual temperature of the compressed refrigerant.

More preferably, in some embodiments, with continued reference to FIG. 7, a temperature sensing unit may be provided on the side of the non-orbiting scroll 42 adjacent the compression chamber.

Referring to fig. 1-3, the heat pump air conditioning system 10 further includes a control unit 17 connected to a temperature detection unit in the scroll compressor to obtain the first temperature.

The control unit 17 is configured to: the injection amount of the intermediate injection port is controlled according to the first temperature to adjust the discharge temperature of the scroll compressor.

In the foregoing, in the heat pump air conditioning system provided in the embodiment of the present application, the intermediate injection passage 15 is provided with the second throttle valve 152; therefore, the control unit 17 may adjust the opening degree of the second throttle valve 152 so that the exhaust gas temperature is less than the preset threshold value, in accordance with the adjustment of the injection amount by the first temperature. It should be noted that the preset threshold may be determined together according to various factors.

For example, the preset threshold may be determined based on the degree of sensitivity of the structure of the orbiting and/or non-orbiting scroll in the compressor to temperature changes, the degree of sensitivity being material and structure dependent. When the sensitivity is high, the structure of the movable scroll and/or the fixed scroll in the compressor is larger along with the temperature change, when the temperature of the compression cavity or the refrigerant in the compression cavity is higher, the deformation of parts is larger, the contact and abrasion between the parts are easy to cause at the moment, and the preset threshold value is required to be set to be smaller.

For another example, the preset threshold may be determined based on a temperature tolerance limit of a pendant component in a heat pump air conditioning system, such as the four-way valve mentioned in the background; in order to avoid damage to components such as the four-way valve due to excessive refrigerant temperature, the preset threshold may be set to be less than the temperature tolerance limit of critical components in the system.

The control of the opening degree of the second throttle valve by the control unit 17 may be in a linear control manner, i.e., a target opening degree of the second throttle valve at the current first temperature is determined according to a linear function relation of the opening degree of the second throttle valve and the temperature difference value established in advance, and the second throttle valve is adjusted to the target opening degree.

It will be appreciated that the heat pump air conditioning system is a relatively complex system, with some hysteresis in the manner of linear control described above. As a better technical scheme, the second throttle valve can be controlled by utilizing a PID algorithm, so that the control precision of controlling the heat pump air conditioning system is improved.

Specifically, according to the first temperature, adjusting the opening of the second throttle valve to make the exhaust temperature smaller than a preset threshold value, including: determining the target opening of the second throttle valve by using a PID control algorithm according to the first temperature and a preset threshold value; and adjusting the opening degree of the second throttle valve to the target opening degree so that the exhaust temperature is smaller than a preset threshold value.

Wherein determining the target opening of the second throttle valve using a PID control algorithm comprises: determining a proportional coefficient, a differential coefficient and an integral coefficient of a PID algorithm according to the first temperature and a preset threshold; and determining an opening curve of the second throttle valve according to the coefficients, so as to adjust the second throttle valve to a target opening degree.

According to the heat pump air conditioning system provided by the embodiment of the application, the temperature detection unit, such as the temperature sensor, is arranged in the shell of the compressor, so that the temperature of the refrigerant in the compressor is measured by the temperature detection unit, and the middle injection quantity of the compressor is adjusted, so that the heat pump air conditioning system can have higher control precision under different working conditions; meanwhile, the failure of parts of the compressor and the heat pump air conditioning system caused by temperature detection misalignment in an extreme environment can be avoided.

The system embodiments of the present application were described above in connection with fig. 1-7, and the scroll compressor provided in the embodiments of the present application will be described in detail below.

The embodiment of the application also provides a scroll compressor, which is applied to a heat pump air conditioning system, and the heat pump air conditioning system can be the heat pump air conditioning system in any of the previous embodiments, for example, the heat pump air conditioning system shown in fig. 1-3. The heat pump air conditioning system includes: the scroll compressor, the condenser, the first throttle valve and the evaporator which form a circulation loop, an intermediate injection passage connected between an outlet of the condenser and an intermediate injection port of the scroll compressor, and a control unit are sequentially communicated, wherein the intermediate injection passage is used for injecting a gaseous or liquid refrigerant into a compression cavity of the scroll compressor through the intermediate injection port.

The scroll compressor may be, for example, the scroll compressor shown in fig. 4 to 7 above, comprising: a housing; the fixed scroll and the movable scroll are arranged in the shell and form the compression cavity; and a temperature detection unit provided in the housing for determining a first temperature of the refrigerant in the compressor, so that the control unit controls the injection amount of the intermediate injection port according to the first temperature to adjust the discharge temperature of the scroll compressor.

Optionally, the temperature detection unit is disposed on the fixed scroll.

Optionally, the fixed scroll comprises a discharge port, and the refrigerant compressed by the compression cavity flows to a discharge port of the scroll compressor through the discharge port; the temperature detecting unit is disposed at a side close to the discharge port.

Optionally, the temperature detecting unit is disposed at a side close to the compression chamber.

Optionally, the intermediate injection passage is provided with a second throttle valve; the controlling the injection amount of the intermediate injection port according to the first temperature to adjust the discharge temperature of the scroll compressor includes: and adjusting the opening degree of the second throttle valve according to the first temperature so that the exhaust temperature is smaller than a preset threshold value.

Optionally, the adjusting the opening of the second throttle valve according to the first temperature to make the exhaust temperature smaller than a preset threshold value includes: determining a target opening degree of the second throttle valve by utilizing a PID control algorithm according to the first temperature and the preset threshold value; and adjusting the opening degree of the second throttle valve to the target opening degree so that the exhaust temperature is smaller than a preset threshold value.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. A scroll compressor comprising:

a housing;

the fixed scroll and the movable scroll are arranged in the shell and form a compression cavity;

a temperature detection unit disposed within the housing for determining a first temperature of refrigerant in the scroll compressor;

and the control unit is arranged on the scroll compressor or outside the scroll compressor, and is in communication connection with the temperature detection unit so as to adjust the exhaust temperature of the scroll compressor according to the first temperature.

2. The scroll compressor of claim 1, wherein the temperature sensing unit is disposed on the non-orbiting scroll.

3. The scroll compressor of claim 2, wherein,

the fixed scroll comprises a discharge port, and the refrigerant compressed by the compression cavity flows to an exhaust port of the scroll compressor through the discharge port;

the temperature detection unit is disposed at a position close to the discharge port.

4. A scroll compressor as claimed in claim 3, wherein the temperature sensing unit is provided at a side close to the compression chamber.

5. A heat pump air conditioning system comprising: a scroll compressor, a condenser, a first throttle valve and an evaporator which are sequentially communicated to form a circulation circuit, and an intermediate injection passage connected between an outlet of the condenser and an intermediate injection port of the scroll compressor, wherein the intermediate injection passage is for injecting a refrigerant in a gaseous or liquid state into a compression chamber of the scroll compressor through the intermediate injection port,

the scroll compressor includes:

a housing;

the fixed scroll and the movable scroll are arranged in the shell and form the compression cavity;

a temperature detection unit disposed within the housing for determining a first temperature of refrigerant in the scroll compressor;

and the control unit is arranged on the scroll compressor or in a heat pump air conditioning system outside the scroll compressor, and is in communication connection with the temperature detection unit so as to control the injection quantity of the intermediate injection port according to the first temperature to adjust the exhaust temperature of the scroll compressor.

6. The heat pump air conditioning system according to claim 5, wherein the temperature detection unit is provided on the fixed scroll.

7. The heat pump air conditioning system according to claim 6, wherein,

the fixed scroll comprises a discharge port, and the refrigerant compressed by the compression cavity flows to an exhaust port of the scroll compressor through the discharge port;

the temperature detection unit is disposed at a position close to the discharge port.

8. The heat pump air conditioning system according to claim 7, wherein the temperature detection unit is provided at a side close to the compression chamber.

9. The heat pump air conditioning system according to claim 5, wherein,

the intermediate injection passage is provided with a second throttle valve;

the control unit adjusts the opening degree of the second throttle valve according to the first temperature so that the exhaust temperature is smaller than a preset threshold value.

10. The heat pump air conditioning system according to claim 9, characterized in that the control unit determines a target opening degree of the second throttle valve using a PID control algorithm according to the first temperature and the preset threshold value, and adjusts the opening degree of the second throttle valve to the target opening degree so that the exhaust gas temperature is less than the preset threshold value.

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