CN213808084U - Compressor, cascade compression system, refrigeration plant and heating equipment - Google Patents

Abstract

The utility model relates to a compressor, overlapping compression system, refrigeration plant and heating equipment. The compressor includes: the machine shell is provided with an accommodating cavity, and at least two air suction holes and at least two air exhaust holes which are communicated with the accommodating cavity; the rotating shaft is rotatably arranged in the accommodating cavity; the at least one partition board is arranged in the accommodating cavity, each partition board is sleeved on the rotating shaft, the accommodating cavity is divided into at least two sub-cavities which are independent from each other by the at least one partition board, and each sub-cavity is correspondingly communicated with an air suction hole and an air exhaust hole; and each pump body component is correspondingly matched and connected with the rotating shaft in each sub-cavity, and is constructed in a way that under the driving of the rotating shaft, the refrigerant is sucked in through the suction hole of the sub-cavity, compressed and then discharged through the exhaust hole of the sub-cavity. Compared with the prior art, the refrigerant compression device has the advantages that simultaneous and independent compression of a plurality of refrigerants can be realized by using one rotating shaft, the system structure is simplified, and the system cost is reduced.

Description

Compressor, cascade compression system, refrigeration plant and heating equipment

Technical Field

The utility model relates to a compressor technical field especially relates to a compressor, overlapping compression system, refrigeration plant and heating equipment.

Background

The cascade compression technology is characterized in that two compressors are used for respectively supporting two sets of refrigerant circulating systems to realize ultrahigh pressure ratio, and the cascade compression technology can be used for solving the technical problems of large-span application of ambient temperature of-35-24 ℃ and water outlet temperature of 80 ℃. The existing cascade compression system has a complex structure due to the adoption of two compressors, and the system cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the complicated and with high costs problem of current overlapping compression system structure, provided a compressor, overlapping compression system, heating equipment and refrigeration plant, this compressor, overlapping compression system, heating equipment and refrigeration plant have and can support the refrigerant circulation system autonomous working more than two, simplify overlapping compression system structure to reduce the technological effect of overlapping compression system cost.

A compressor, comprising:

the shell is provided with an accommodating cavity, and at least two air suction holes and at least two air exhaust holes which are communicated with the accommodating cavity;

the rotating shaft is rotatably arranged in the accommodating cavity;

the at least one partition plate is arranged in the accommodating cavity, each partition plate is sleeved on the rotating shaft, the accommodating cavity is divided into at least two sub-cavities which are independent from each other by the at least one partition plate, and each sub-cavity is correspondingly communicated with one air suction hole and one air exhaust hole; and a process for the preparation of a coating,

each pump body component is correspondingly matched and connected with the rotating shaft in each sub-cavity, and each pump body component is constructed to suck a refrigerant through the suction hole of the sub-cavity under the driving of the rotating shaft, compress the refrigerant and then discharge the refrigerant through the exhaust hole of the sub-cavity.

In one embodiment, the rotating shaft is a crankshaft, the crankshaft comprises a crankshaft body and at least two eccentric parts which are convexly arranged on the crankshaft body along the radial direction of the crankshaft body, the at least two eccentric parts are arranged at intervals along the axial direction of the rotating shaft body, and the at least two eccentric parts correspond to the at least two sub-cavities one by one;

the baffle plate is sleeved on the crankshaft body, and the pump body assembly is matched and connected with the eccentric part.

In one embodiment, each pump body assembly comprises a cylinder fixedly arranged on the casing, and a roller and a slide sheet arranged in the cylinder;

the crankshaft body is rotatably connected with the cylinder, the eccentric part is positioned in the cylinder, the roller is sleeved on the eccentric part in the cylinder, the outer wall of the roller is tangent to the inner wall of the cylinder, and a compression cavity is formed by the outer wall of the roller and the inner wall of the cylinder;

the cylinder has all intercommunication compression chamber's induction port, gas vent and mounting groove, the induction port with correspond the suction opening intercommunication, the gas vent with correspond exhaust hole intercommunication, the mounting groove is located the induction port with between the gas vent, the mounting groove is followed the radial extension of bent axle body, the one end slidable of gleitbretter is located in the mounting groove, the other end butt of gleitbretter in the periphery wall of roller, the gleitbretter is cut apart compression chamber.

In one embodiment, each pump body assembly further comprises a flange fixedly connected to the casing, the flange is provided with a connecting hole, and the connecting hole is rotatably matched with the crankshaft body;

one end of the cylinder of each pump body assembly is abutted against the adjacent partition plate, and the other end of the cylinder of each pump body assembly is abutted against the flange.

In one embodiment, the motor is arranged in the sub-cavity close to the end part of the machine shell in the at least two sub-cavities, and is in transmission connection with the rotating shaft and used for driving the rotating shaft to rotate.

Additionally, the utility model discloses an embodiment still provides a cascade compression system, includes:

a condenser, an intermediate heat exchanger and an evaporator, and a compressor as described in any one of the embodiments above;

the condenser comprises a first condensation interface and a second condensation interface which are communicated with each other, the intermediate heat exchanger comprises a first intermediate interface and a fourth intermediate interface which are communicated with each other, and a second intermediate interface and a third intermediate interface which are communicated with each other, and the evaporator comprises a first evaporation interface and a second evaporation interface which are communicated with each other;

the second condensation interface is communicated with the fourth intermediate interface, and the third intermediate interface is communicated with the second evaporation interface;

the sub-cavities comprise a first sub-cavity and a second sub-cavity, the exhaust hole of the first sub-cavity is communicated with the first condensation interface, the suction hole of the first sub-cavity is communicated with the first middle interface, the suction hole of the second sub-cavity is communicated with the first evaporation interface, and the exhaust hole of the second sub-cavity is communicated with the second middle interface

In one embodiment, the refrigerant flowing through the condenser is a first refrigerant, the refrigerant flowing through the evaporator is a second refrigerant, and the saturation pressure of the first refrigerant is lower than that of the second refrigerant at the same temperature.

In one embodiment, the first refrigerant is an R134a refrigerant, and the second refrigerant is an R32 refrigerant.

In one embodiment, the condenser is a shell-and-tube heat exchanger, the evaporator is a fin-and-coil heat exchanger, and the intermediate heat exchanger is a plate heat exchanger.

In addition, the utility model discloses an embodiment still provides a heating equipment, includes the overlapping compression system that any above-mentioned embodiment provided.

Additionally, an embodiment of the present invention further provides a refrigeration device, including the overlapping compression system provided by any of the above embodiments.

In the compressor, during actual operation, the pump body assembly in each independent sub-cavity is driven by the same rotating shaft to suck a refrigerant into the pump body assembly from the suction hole corresponding to the sub-cavity, and the refrigerant forms high-temperature and high-pressure gas under the compression action of the pump body assembly and then enters a pipeline outside the compressor through the exhaust hole corresponding to the sub-cavity. Because the holding cavity is divided by the partition plates to form a plurality of independent sub-cavities, namely, the sub-cavities are not communicated with each other, when each pump body assembly compresses the refrigerant, the refrigerant in the adjacent sub-cavities can not be in streaming connection, and the independent circulation of each refrigerant loop is realized.

Compared with the prior art, the compressor has the advantages that simultaneous and independent compression of a plurality of refrigerants can be realized by using one rotating shaft, so that the compression capacity and the utilization rate of the compressor are improved; meanwhile, the number of compressors of the overlapping compression system can be reduced, the structure of the overlapping compression system is simplified, and the cost of the overlapping compression system is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a compressor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cascade compression system according to an embodiment of the present invention.

Description of reference numerals:

1-a compressor; 11-a housing; 111-suction holes; 112-vent hole; 12-a rotating shaft; 121-eccentric portion; 13-a separator; 14-a pump body assembly; 141-a cylinder; 142-a roller; 143-flange; 144-a motor; 2-a condenser; 21-a first condensation interface; 22-a second condensation interface; 3-an intermediate heat exchanger; 31-a first intermediate interface; 32-a second intermediate interface; 33-a third intermediate interface; 34-a fourth intermediate interface; 4-an evaporator; 41-a first evaporation interface; 42-a second evaporation interface; 5-a first throttle valve; 6-a second throttle valve; 7-a first four-way valve; and 8-a second four-way valve.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, an embodiment of the present invention provides a compressor 1, which includes a casing 11, a rotating shaft 12, at least one partition plate 13, and at least two pump assemblies 14. The cabinet 11 has an accommodating chamber, and at least two suction holes 111 and at least two discharge holes 112 communicating with the accommodating chamber. The rotating shaft 12 is rotatably disposed in the accommodating cavity. At least one baffle 13 is arranged in the accommodating cavity, each baffle 13 is sleeved on the rotating shaft 12, the accommodating cavity is divided into at least two sub-cavities independent from each other by the at least one baffle 13, and each sub-cavity is correspondingly communicated with one suction hole 111 and one exhaust hole 112. Each pump assembly 14 is correspondingly coupled to the rotating shaft 12 in each sub-cavity, and each pump assembly 14 is configured to suck a refrigerant through the suction hole 111 of the sub-cavity under the driving of the rotating shaft 12, compress the refrigerant, and then discharge the refrigerant out of the housing 11 through the discharge hole 112 of the sub-cavity.

In the above compressor 1, during actual operation, the pump body assembly 14 in each independent sub-cavity is driven by the same rotating shaft 12 to suck the refrigerant into the pump body assembly 14 from the suction hole 111 corresponding to the sub-cavity, and the refrigerant forms high-temperature and high-pressure gas under the compression action of the pump body assembly 14 and then enters the pipeline outside the compressor 1 through the exhaust hole 112 corresponding to the sub-cavity. Because the accommodating cavity is divided by the partition plates 13 to form a plurality of independent sub-cavities, namely, the sub-cavities are not communicated with each other, when each pump body assembly 14 compresses the refrigerant, the refrigerant in the adjacent sub-cavities cannot be in series flow, and the independent circulation of each refrigerant loop is realized.

Compared with the prior art, the compressor 1 can simultaneously and independently compress a plurality of refrigerants by using one rotating shaft 12, so that the compression capacity and the utilization rate of the compressor 1 are improved; meanwhile, the number of the compressors 1 of the overlapping compression system can be reduced, the structure of the overlapping compression system is simplified, and the cost of the overlapping compression system is reduced.

It can be understood that each pump body assembly 14 is correspondingly disposed in one of the sub-cavities and is coupled to the rotating shaft 12 in the corresponding sub-cavity, and when the rotating shaft 12 rotates, the pump body assembly 14 can perform the processes of air suction, compression, air exhaust, and the like.

It should be noted that a through matching hole is formed in the partition plate 13 along the axial direction of the rotating shaft 12, the matching hole is sleeved on the rotating shaft 12, and the partition plate 13 is hermetically connected with the casing 11 to form each independent sub-cavity. Preferably, the matching hole of the partition 13 is rotatably and hermetically matched with the rotating shaft 12, and the partition 13 is fixedly connected with the casing 11, at this time, when the rotating shaft 12 rotates, the rotating shaft 12 and the partition 13 relatively rotate, and the partition 13 is kept still.

It should be noted that the compressor 1 according to the embodiment of the present invention may be a rotary compressor 1 such as a sliding vane compressor 1 or a rolling rotor compressor 1, and the pump body assembly 14 of the compressor 1 may be determined according to the type of the compressor 1. For example, when the compressor 1 is a sliding vane compressor 1, the pump assembly 14 includes a plurality of sliding vanes, at this time, the rotating shaft 12 is eccentrically disposed with respect to the casing 11 (i.e., the cylinder 141 stator), the rotating shaft 12 is radially provided with a plurality of grooves, the grooves are internally provided with sliding vanes capable of sliding along the radial direction, and the end portions of the sliding vanes are abutted against the inner wall of the casing 11, the plurality of sliding vanes divide the sub-cavity into a plurality of elementary volumes, and when the rotor rotates, the sliding vanes slide in the grooves under the action of centrifugal force. Within one rotation of the shaft 12, the volume of each cell gradually increases from the minimum value to the maximum value, and then gradually decreases from the maximum value to the minimum value. With the continuous rotation of the spindle 12, the volume of the element changes repeatedly according to the above rule, so as to complete the compression of the refrigerant once and again.

In some embodiments, referring to fig. 1, the rotating shaft 12 is a crankshaft, the crankshaft includes a crankshaft body and at least two eccentric portions 121 protruding from the crankshaft body in a radial direction of the crankshaft body, the at least two eccentric portions 121 are arranged at intervals in an axial direction of the rotating shaft 12, and the at least two eccentric portions 121 correspond to the at least two sub-cavities one to one. The partition plate 13 is sleeved on the crankshaft body, and the pump body assembly 14 is connected with the eccentric portion 121 in a matching manner. In actual operation, when the crankshaft rotates, the eccentric portion 121 drives the pump assembly 14 to perform eccentric motion relative to the housing 11, and the eccentric portion 121 rotates.

The rotation center of the crankshaft main body coincides with the center of the housing 11.

In an embodiment, referring to fig. 1, the pump assembly 14 is disposed on the crankshaft according to the pump assembly 14 of the rolling rotor compressor 1, and includes a cylinder 141 fixed in the casing 11, and a roller 142 and a vane (not shown) disposed in the cylinder 141. At this time, the crankshaft body is rotatably connected to the cylinder 141, the eccentric portion 121 is located in the cylinder 141, the roller 142 is coaxially sleeved on the eccentric portion 121 in the cylinder 141, the outer wall of the roller 142 is tangent to the inner wall of the cylinder 141 and surrounds the inner wall of the cylinder 141 to form a compression chamber, the cylinder 141 is provided with a suction port, an exhaust port and a mounting groove, the suction port of the cylinder 141 is communicated with the suction hole 111 of the sub-cavity, the exhaust port of the cylinder 141 is communicated with the exhaust hole 112 of the sub-cavity, the mounting groove is located between the suction port and the exhaust port and extends along the radial direction of the crankshaft body, one end of the slide sheet is slidably located in the mounting groove, the other end of the slide sheet abuts against the outer peripheral wall of the roller 142, and the slide sheet and.

In actual operation, the roller 142 in each sub-cavity rotates following the eccentric portion 121 in each sub-cavity, and slides in close contact with the inner wall of each cylinder 141. A crescent-shaped compression cavity is formed between the outer wall of the roller 142 and the inner wall of the cylinder 141, the position of the compression cavity changes along with the rotation angle of the roller 142, the slide sheet divides the compression cavity into two independent parts, one part is communicated with the air suction hole 111, and the other part is communicated with the exhaust port. When the roller 142 rotates, the sliding sheet is driven to slide along the mounting groove, and the sizes of the two independent parts are changed continuously in the process, so that air suction, compression and exhaust are realized.

It will be appreciated that the slide simultaneously abuts the inner wall of the cylinder 141 for the purpose of substantially completely dividing the compression chamber.

Further, each pump body assembly 14 further includes a spring (not shown) configured to extend and retract along the mounting slot, one end of the sliding piece being connected to the spring, and the other end of the sliding piece abutting against the outer wall of the roller 142. At this moment, the slip sheet is tightly abutted on the outer wall of the roller 142 through the elastic force of the spring, so that the contact stability of the roller 142 and the slip sheet is ensured, and the independence of the two parts divided by the slip sheet is ensured to be good.

In particular, in the embodiment, with reference to fig. 1, the compressor 1 comprises two suction holes 111 and two discharge holes 112, as well as a partition 13 and two pump assemblies 14. At this time, the number of the eccentric portions 121 is two, the included angle between the central axes of the two eccentric portions 121 and the plane formed by the central axes of the crankshaft body is 180 degrees, and at this time, the two pump body assemblies 14 alternately suck, compress and exhaust air; so can effectively balance the unbalanced inertial force when the bent axle rotates, have the absorbing effect. The direction of the arrows in fig. 1 is the direction of the refrigerant flow in the two pump assemblies 14.

In an embodiment, referring to fig. 1, each pump assembly 14 further includes a flange 143 fixedly connected to the housing 11, the flange 143 having a connecting hole, and the connecting hole is rotatably coupled to the crankshaft body. One end of the cylinder 141 of each pump body assembly 14 is pressed against the adjacent partition 13, and the other end is pressed against the flange 143. Therefore, the partition plate 13 and the flange 143 act to realize the fixed installation of each pump body assembly 14, the utilization rate of the partition plate 13 is improved, and the structure is also simplified.

In some embodiments, referring to fig. 1, the compressor 1 further includes a motor 144, the motor 144 is disposed in a sub-cavity of the at least two sub-cavities near the end of the casing 11, and is drivingly connected to the rotating shaft 12 for driving the rotating shaft 12 to rotate. The rotating shaft can be in transmission connection with an output shaft of the motor 144 through a transmission device such as a coupler, or the rotating shaft 12 is movably arranged between rotors of the motor 144, and the rotating shaft is driven to rotate by a magnetic field generated when the motor 144 operates. The utilization rate of the compressor 1 is greatly improved and the structure of the compressor 1 is simplified by using the motor 144 and the rotating shaft 12 to drive the pump body assemblies 14 to work independently.

In other embodiments, the pump assembly 14 may be disposed on the crankshaft according to a structure in the pump assembly 14 of the sliding vane compressor 1, for example, a groove is formed on the eccentric portion 121 along a radial direction of the eccentric portion 121, a sliding vane is slidably disposed in each groove, an end of the sliding vane abuts against an inner wall of the casing 11, the sub-cavity is divided into a plurality of elementary volumes by the plurality of sliding vanes, and when the rotor rotates, the sliding vane slides in the groove under a centrifugal force, which is not described in detail herein.

The embodiment of the utility model provides a compressor 1, pump body subassembly 14 in each independent sub-cavity is under the drive of same pivot 12, inhales the refrigerant from the suction hole 111 that corresponds with the sub-cavity and gets into pump body subassembly 14 in, the refrigerant is under pump body subassembly 14's compression effect, forms behind the highly compressed gas of high temperature in the pipeline outside the exhaust hole 112 that corresponds with the sub-cavity enters into compressor 1. Because the accommodating cavity is divided by the partition plates 13 to form a plurality of independent sub-cavities, namely, the sub-cavities are not communicated with each other, when each pump body assembly 14 compresses the refrigerant, the refrigerant in the adjacent sub-cavities cannot be in series flow, and the independent circulation of each refrigerant loop is realized.

Compared with the prior art, the compressor 1 can simultaneously and independently compress a plurality of refrigerants by using one rotating shaft 12, so that the compression capacity and the utilization rate of the compressor 1 are improved; meanwhile, the number of the compressors 1 of the overlapping compression system can be reduced, the structure of the overlapping compression system is simplified, and the cost of the overlapping compression system is reduced.

In addition, referring to fig. 2, the embodiment of the present invention further provides a cascade compression system, which includes a condenser 2, an intermediate heat exchanger 3, an evaporator 4, and a compressor 1. The condenser 2 comprises a first condensation interface 21 and a second condensation interface 22 which are communicated with each other, the intermediate heat exchanger 3 comprises a first intermediate interface 31 and a fourth intermediate interface 34 which are communicated with each other, and a second intermediate interface 32 and a third intermediate interface 33 which are communicated with each other, the evaporator 4 comprises a first evaporation interface 41 and a second evaporation interface 42 which are communicated with each other, the second condensation interface 22 is communicated with the fourth intermediate interface 34, and the third intermediate interface 33 is communicated with the second evaporation interface 42.

The sub-cavities comprise a first sub-cavity and a second sub-cavity, the exhaust hole 112 of the first sub-cavity is communicated with the first condensation port 21, the suction hole 111 of the first sub-cavity is communicated with the first intermediate port 31, the exhaust hole 112 of the second sub-cavity is communicated with the first evaporation port 41, and the suction hole 111 of the second sub-cavity is communicated with the second intermediate port 32.

In the cascade compression system, the refrigerant flowing through the condenser 2 is the first refrigerant, and the refrigerant flowing through the evaporator 4 is the second refrigerant. The condenser 2, the intermediate heat exchanger 3 and the first subchamber and the internal structure of the compressor 1 are used as a high-temperature-stage heat exchange system, and the first refrigerant is used as a refrigerant for the high-temperature-stage heat exchange system. The second self-strength of the evaporator 4, the intermediate heat exchanger 3 and the compressor 1 and the internal structure are used as a low-temperature-stage heat exchange system, and the second refrigerant acts on the refrigerant for the low-temperature-stage heat exchange system.

In actual operation, the pump assembly 14 in the first sub-cavity of the compressor 1 compresses the first refrigerant, and the pump assembly 14 in the second sub-cavity of the compressor 1 compresses the second refrigerant. Meanwhile, the first refrigerant and the second refrigerant are compressed by a rotating shaft 12 in the compressor 1, so that the structure of the cascade compression system is greatly simplified, and the system cost is obviously reduced.

The cascade compression system can be used for heating a first exchange substance and refrigerating a second exchange substance, a high-temperature high-pressure first refrigerant flowing out of the first sub-cavity enters the condenser 2 and is used for exchanging heat with the first exchange substance to heat the first exchange substance, then the first refrigerant which is liquefied to form a liquid state enters the intermediate heat exchanger 3 and exchanges heat with a high-temperature high-pressure second refrigerant flowing out of the second sub-cavity of the compressor 1, the first refrigerant is gasified into a gaseous second refrigerant and then is sucked into the first sub-cavity again to be compressed, and therefore next round of circulation is performed. Meanwhile, after heat exchange is carried out on the high-temperature and high-pressure second refrigerant in the intermediate heat exchanger 3, the liquid second refrigerant is formed, heat exchange is carried out on the liquid second refrigerant and a second exchange substance in the evaporator 4, the second refrigerant is formed into a gaseous second refrigerant through heat absorption and gasification, and then compression is carried out in the second sub-chamber again to carry out next cycle.

In practical applications, the cascade compression system may be applied to a refrigeration apparatus or a heating apparatus. When the cascade compression system is applied to a heating apparatus, the evaporator 4 is used as an outdoor unit for absorbing heat of outdoor air, and the condenser 2 is used as an indoor unit for heating indoor water to achieve heating. When the cascade compression system is applied to a refrigeration apparatus, the evaporator 4 is used as an indoor unit for absorbing heat of outdoor air, and the condenser 2 is used as an indoor unit for heating outdoor air.

It will be appreciated that the cascade compression system further comprises a first throttle valve 5 and a second throttle valve 6, the first throttle valve 5 communicating with said second condensation port 22 and said third intermediate port 33, the second throttle valve 6 communicating with said second intermediate port 32 and said first evaporation port 41. During actual operation, the first refrigerant forms low-temperature low-pressure liquid after passing through the first throttling valve 5 after releasing heat in the condenser 2, so that the first refrigerant and the second refrigerant can perform effective heat exchange in the intermediate heat exchanger 3, and the second refrigerant forms low-temperature low-pressure liquid after passing through the second throttling valve 6 after releasing heat in the evaporative condenser 2, so that the second refrigerant can perform effective heat exchange in the evaporator 4.

In addition, the cascade compression system further includes a first four-way valve 7 and a second four-way valve 8, and when both the first four-way valve 7 and the second four-way valve 8 are switchable between the first communication state and the second communication state. When the first four-way valve 7 and the second four-way valve 8 are in the first communication state, the cascade compression system is in the working state of cooling or heating, at this time, the first condensing interface 21 and the first intermediate interface 31 are respectively communicated with the suction hole 111 of the first sub-cavity and the exhaust hole 112 of the first sub-cavity through the first four-way valve 7, and the first evaporating interface 41 and the second intermediate interface 32 are respectively communicated with the suction hole 111 of the second sub-cavity and the exhaust hole 112 of the second sub-cavity through the second four-way valve 8.

When the first four-way valve 7 and the second four-way valve 8 are in the second communication state, the cascade compression system is in the defrosting state, at this time, the first condensing interface 21 and the first intermediate interface 31 are respectively communicated with the exhaust hole 112 of the first sub-cavity and the suction hole 111 of the first sub-cavity through the first four-way valve 7, and the first evaporating interface 41 and the second intermediate interface 32 are respectively communicated with the exhaust hole 112 of the second sub-cavity and the suction hole 111 of the second sub-cavity through the second four-way valve 8.

In this way, the automatic defrosting of the cascade compression system can be realized by only switching the communication state of the first four-way valve 7 and the second four-way valve 8, so that the refrigerating or heating effect of the cascade compression system can be realized.

In an embodiment, the saturation pressure of the first refrigerant is lower than the saturation pressure of the second refrigerant at the same temperature. Therefore, the ratio of the pressure of the first refrigerant in the condenser 2 to the pressure of the second refrigerant in the evaporator 4 can be improved, so that the pressure ratio of the cascade compression system is favorably provided, and the environmental temperature adaptation range of the cascade compression system is expanded.

Further, the first refrigerant is R134a (1, 1, 1, 2-tetrafluoroethane) refrigerant, and the second refrigerant is R32 (difluoromethane) refrigerant. The R32 refrigerant has high saturation pressure and is suitable for being used as a low-temperature refrigerant, and the R134a refrigerant has low saturation pressure and is suitable for being used as a high-temperature refrigerant.

Further, the condenser 2 is a shell-and-tube heat exchanger, the evaporator 4 is a fin-type heat exchanger, and the intermediate heat exchanger 3 is a plate-type heat exchanger.

Furthermore, according to the characteristics of the R134a working medium, the condenser is sensitive to pressure drop, the condenser 2 preferably adopts a phi 12.7 pipe diameter efficient heat exchange copper pipe, and the refrigerant pressure drop is reduced by large pipe diameter heat exchange. In addition, according to the characteristics of the R32 working medium, the evaporator is insensitive to pressure drop, and the evaporator 4 adopts a phi 7 or phi 8 pipe diameter efficient heat exchange copper pipe, so that the flow velocity in the pipe is increased, and the heat exchange efficiency is improved.

Practice proves that the pressure ratio of the overlapping compression system provided in the embodiment of the present invention can reach 20.

In addition, an embodiment of the present invention further provides a refrigeration device, which includes the overlapping compression system described in any of the above embodiments. Since the refrigeration equipment is provided with the cascade compression system, all the beneficial effects are also achieved, and the details are not repeated herein.

The refrigeration equipment can be equipment such as a low-temperature freezer which needs to be prepared with ultralow temperature.

Additionally, an embodiment of the present invention further provides a refrigeration device, which includes the overlapping compression system described in any of the above embodiments. Since the heating device has the above-mentioned cascade compression system, it also has all the above-mentioned advantages, which are not described herein again.

The heating equipment can be heat pump equipment and can be applied to the environment temperature of minus 35 ℃ to 24 ℃, and the outlet water temperature is as high as 80 ℃.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (11)

1. A compressor, comprising:

the air conditioner comprises a machine shell (11) which is provided with an accommodating cavity, at least two air suction holes (111) and at least two air exhaust holes (112) which are communicated with the accommodating cavity;

the rotating shaft (12) is rotatably arranged in the accommodating cavity;

the at least one partition plate (13) is arranged in the accommodating cavity, each partition plate (13) is sleeved on the rotating shaft (12), the accommodating cavity is divided into at least two sub-cavities which are independent from each other by the at least one partition plate (13), and each sub-cavity is correspondingly communicated with one air suction hole (111) and one air exhaust hole (112); and a process for the preparation of a coating,

each pump body component (14) is correspondingly matched with the rotating shaft (12) in each sub-cavity, and each pump body component (14) is driven by the rotating shaft (12) to suck a refrigerant through the suction hole (111) of the sub-cavity, compress the refrigerant and then discharge the refrigerant through the exhaust hole (112) of the sub-cavity.

2. The compressor of claim 1, wherein the rotating shaft (12) is a crankshaft, the crankshaft comprises a crankshaft body and at least two eccentric parts (121) protruding from the crankshaft body along a radial direction of the crankshaft body, the at least two eccentric parts (121) are arranged at intervals along an axial direction of the rotating shaft (12) body, and the at least two eccentric parts (121) correspond to the at least two sub-cavities one by one;

the partition plate (13) is sleeved on the crankshaft body, and the pump body assembly (14) is connected with the eccentric part (121) in a matching mode.

3. The compressor of claim 2, wherein each pump body assembly (14) comprises a cylinder (141) fixed to the casing (11) and a roller (142) and a vane provided in the cylinder (141);

the crankshaft body is rotatably connected to the cylinder (141), the eccentric part (121) is located in the cylinder (141), the roller (142) is sleeved on the eccentric part (121) in the cylinder (141), the outer wall of the roller (142) is tangent to the inner wall of the cylinder (141), and a compression cavity is formed by the roller and the inner wall of the cylinder (141);

cylinder (141) have all communicate suction port, gas vent and the mounting groove in compression chamber, the suction port with correspond suction hole (111) intercommunication, the gas vent with correspond exhaust hole (112) intercommunication, the mounting groove is located the suction port with between the gas vent, the mounting groove is followed the radial extension of bent axle body, the one end slidable of gleitbretter is located in the mounting groove, the other end butt of gleitbretter in the periphery wall of roller (142), the gleitbretter is cut apart the compression chamber.

4. The compressor of claim 3, wherein each pump body assembly (14) further comprises a flange (143) fixedly connected to the casing (11), the flange (143) having a connecting hole, the connecting hole being rotatably coupled to the crankshaft body;

one end of the cylinder (141) of each pump body assembly (14) is pressed against the adjacent partition plate (13), and the other end of the cylinder is pressed against the flange (143).

5. The compressor as claimed in any one of claims 1 to 4, further comprising a motor (144), wherein the motor (144) is disposed in the sub-cavity of the at least two sub-cavities near the end of the shell (11) and is in transmission connection with the rotating shaft (12) for driving the rotating shaft (12) to rotate.

6. A cascade compression system, comprising a condenser (2), an intermediate heat exchanger (3) and an evaporator (4), and a compressor (1) according to any one of claims 1 to 5;

the condenser (2) comprises a first condensation interface (21) and a second condensation interface (22) which are communicated with each other, the intermediate heat exchanger (3) comprises a first intermediate interface (31) and a fourth intermediate interface (34) which are communicated with each other, and a second intermediate interface (32) and a third intermediate interface (33) which are communicated with each other, and the evaporator (4) comprises a first evaporation interface (41) and a second evaporation interface (42) which are communicated with each other;

the second condensation port (22) is communicated with the fourth intermediate port (34), and the third intermediate port (33) is communicated with the second evaporation port (42);

the sub-cavities comprise a first sub-cavity and a second sub-cavity, the exhaust hole (112) of the first sub-cavity is communicated with the first condensation interface (21), the suction hole (111) of the first sub-cavity is communicated with the first intermediate interface (31), the suction hole (111) of the second sub-cavity is communicated with the first evaporation interface (41), and the exhaust hole (112) of the second sub-cavity is communicated with the second intermediate interface (32).

7. The cascade compression system according to claim 6, wherein the refrigerant flowing through the condenser (2) is a first refrigerant, the refrigerant flowing through the evaporator (4) is a second refrigerant, and a saturation pressure of the first refrigerant is lower than a saturation pressure of the second refrigerant at the same temperature.

8. The cascade compression system as claimed in claim 7, wherein the first refrigerant is an R134a refrigerant, and the second refrigerant is an R32 refrigerant.

9. A cascade compression system according to claim 6, wherein the condenser (2) is a shell and tube heat exchanger, the evaporator (4) is a finned coil heat exchanger and the intermediate heat exchanger (3) is a plate heat exchanger.

10. A heating apparatus comprising a cascade compression system as claimed in any one of claims 6 to 9.

11. Refrigeration device, characterized in that it comprises a cascade compression system according to any of claims 6 to 9.

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