CN110966202A

CN110966202A - Compressor assembly, control method of compressor assembly and refrigeration equipment

Info

Publication number: CN110966202A
Application number: CN201811156594.XA
Authority: CN
Inventors: 钟升; 郭宏; 刘永利; 梁自强
Original assignee: Guangdong Meizhi Precision Manufacturing Co Ltd
Current assignee: Guangdong Meizhi Precision Manufacturing Co Ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2020-04-07

Abstract

The invention discloses a compressor assembly, a control method of the compressor assembly and refrigeration equipment, wherein the compressor assembly comprises: the compressor comprises a shell, a driving part and a compression part, a first space is limited in the shell, the driving part is connected with the compression part and is arranged in the first space, a second space is limited by the compression part, an air suction port and an air exhaust port are arranged on the shell, an inlet of the second space is communicated with the air suction port, an outlet of the second space is communicated with the first space, the first space is communicated with the air exhaust port, the oil separator is arranged outside the compressor and is communicated with the air exhaust port, the liquid storage device is arranged outside the compressor and is communicated with the air suction port, and the flow direction control device can be switched between states of communicating and separating the oil separator and the liquid storage device. The compressor assembly can restart compression work quickly after power failure, and has high reliability and long service life.

Description

Compressor assembly, control method of compressor assembly and refrigeration equipment

Technical Field

The invention relates to the technical field of refrigeration, in particular to a compressor assembly, a control method of the compressor assembly and refrigeration equipment.

Background

Generally, a high back pressure compressor is mostly used in a household refrigeration device. The high back pressure compressor refers to: the compressor directly sucks the low-pressure refrigerant into the compression cavity and directly discharges the high-pressure refrigerant into the shell through the compression cavity, so that the suction side of the high-back-pressure compressor is the low-pressure refrigerant, and the exhaust side of the high-back-pressure compressor is the high-pressure refrigerant. In the operation process of the high-backpressure compressor, once a power supply is disconnected, the pressure difference between the suction side and the exhaust side of the compressor is large, so that the compressor cannot be restarted instantly. When the high back pressure compressor can not be restarted due to the pressure difference, if power is continuously applied to the compressor, the motor of the compressor is overloaded, the motor overload protection device is triggered to repeatedly act, so that the overload protection device is damaged, the motor is damaged due to overheating, and the reliability of the compressor is reduced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a compressor assembly which can be used for rapidly restarting compression work after power failure, and has high reliability and long service life.

The invention also provides a control method of the compressor assembly.

The invention also provides refrigeration equipment with the compressor assembly.

A compressor assembly according to an embodiment of the first aspect of the invention, comprises: the compressor comprises a shell, a driving part and a compression part, wherein a first space is defined in the shell, the driving part is connected with the compression part and is arranged in the first space, the compression part defines a second space, an air suction port and an air exhaust port are arranged on the shell, an inlet of the second space is communicated with the air suction port, an outlet of the second space is communicated with the first space, and the first space is communicated with the air exhaust port; an oil separator disposed outside the compressor, the oil separator defining a third space in communication with the exhaust port; the liquid storage device is arranged outside the compressor and limits a fourth space communicated with the air suction port; and the flow direction control device is communicated with the third space and the fourth space respectively and is switched between an opening state and a closing state, the flow direction control device is communicated with the third space and the fourth space in the opening state, and the flow direction control device is used for isolating the third space and the fourth space in the closing state.

The compressor assembly can restart compression work quickly after power failure, and has high reliability and long service life.

In some embodiments, the flow direction control device includes: the switching valve is provided with a first interface and a second interface and can be switched between the states of communicating and isolating the first interface and the second interface; the two ends of the first communication pipe are respectively communicated with the oil separator and the first interface; and the two ends of the second communicating pipe are respectively communicated with the liquid storage device and the second interface.

In some embodiments, the oil separator is mounted on the compressor by an oil separator bracket, the accumulator is mounted on the compressor by an accumulator bracket, and the switching valve is mounted on one of the compressor, the accumulator, and the oil separator by a valve body bracket.

In some embodiments, the switching valve is a solenoid valve, or a diaphragm valve, or a hydraulic valve.

In some embodiments, the first space has an oil sump at a bottom thereof, the third space has a first oil mist separator therein, a first connecting pipe and a second connecting pipe are arranged on the top wall of the oil separator in a penetrating way, a third connecting pipe is arranged on the bottom wall in a penetrating way, a first bypass port is formed on the side wall, one end of the first connecting pipe is communicated with the exhaust port, the other end of the first connecting pipe is inserted into the third space and is positioned above the first oil mist separating piece, one end of the second connecting pipe is communicated with a refrigerant flow path in the refrigerating system, the other end of the second connecting pipe is inserted into the third space and is positioned below the first oil mist separating piece, one end of the third connecting pipe is communicated with the oil pool, the other end of the third connecting pipe is inserted into the third space and is positioned below the first oil mist separating piece, the first communication pipe communicates with the first bypass port, and the first bypass port is located below the first oil mist separator.

In some embodiments, the first bypass port is located in an upper-middle portion of the oil separator.

In some embodiments, a second oil mist separator is disposed in the fourth space, a fourth connecting pipe is disposed on a top wall of the reservoir in a penetrating manner, a fifth connecting pipe is disposed on a bottom wall of the reservoir in a penetrating manner, a second bypass port is formed on a side wall of the reservoir, one end of the fourth connecting pipe is communicated with a refrigerant flow path in the refrigeration system, the other end of the fourth connecting pipe is inserted into the fourth space and is located above the second oil mist separator, one end of the fifth connecting pipe is communicated with the suction port, the other end of the fifth connecting pipe is inserted into the fourth space and is located below the second oil mist separator, the second communicating pipe is communicated with the second bypass port, and the second bypass port is located below the second oil mist separator.

In some embodiments, the second bypass port is located in an upper middle portion of the reservoir.

In some embodiments, the compressor further comprises: and the detection part is in signal transmission with the driving part and is used for detecting the state of the flow direction control device.

A control method of a compressor assembly according to an embodiment of the second aspect of the present invention, the compressor assembly being the compressor assembly according to the first aspect of the present invention, includes: when the compression part loads a compression load, the flow direction control device is switched to the closed state; when the compression unit unloads a compression load, the flow direction control device is switched to the open state. Therefore, the reliability and the smoothness of restarting the compressor assembly can be improved.

According to a control method of a compressor assembly according to an embodiment of a third aspect of the present invention, the compressor assembly is the compressor assembly according to the first aspect of the present invention, the control method includes: before the compression part loads compression load, the pressure difference between the exhaust port and the suction port is detected, if the detected pressure difference is larger than or equal to a reference value, the flow direction control device is switched to the opening state, and the driving part is started in a delayed mode. Therefore, the reliability and the smoothness of restarting the compressor assembly can be ensured.

A refrigeration device according to an embodiment of a fourth aspect of the present invention includes: the heat exchanger comprises a compressor assembly, a first heat exchanger, a second heat exchanger and a throttling device, wherein the compressor assembly, the first heat exchanger, the throttling device and the second heat exchanger are connected to form a circulation loop, and the compressor assembly is the compressor assembly according to the first aspect of the invention.

According to the refrigeration equipment, due to the arrangement of the compressor assembly in the first aspect, the refrigeration equipment can be restarted immediately after shutdown and meets the heat exchange requirement, user experience is improved, energy consumption during restarting is low, loss of parts of the refrigeration equipment is avoided, and the service life of the refrigeration equipment is prolonged.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a front view of a compressor assembly according to one embodiment of the present invention;

FIG. 2 is a top view of the compressor assembly shown in FIG. 1;

FIG. 3 is a partial cross-sectional view at another angle of the compressor assembly shown in FIG. 1;

FIG. 4 is an enlarged view of portion A circled in FIG. 3;

FIG. 5 is a schematic structural view of a check valve according to one embodiment of the present invention;

FIG. 6 is a mating view of a compressor and oil separator according to one embodiment of the present invention;

FIG. 7 is a diagram of a compressor in combination with an accumulator and flow direction control device in accordance with one embodiment of the present invention;

FIG. 8 is a partial enlarged view of the flow direction control device shown in FIG. 7;

fig. 9 is a schematic diagram of a refrigeration system in a refrigeration appliance according to one embodiment of the present invention.

Reference numerals:

a refrigeration apparatus 1000;

a compressor assembly 100;

a compressor 1; a housing 11; a first space 1101; an air inlet 1102; an exhaust port 1103; an oil sump 1104; an upper case 111; a middle housing 112; a lower case 113; an exhaust pipe 114; an air intake duct 115; a drive section 12; a stator 121; a rotor 122; a compression section 13; a second space 130; an inlet 1301; an outlet 1302; a piston 131; a cylinder 132; a main bearing 133; the secondary bearing 134; a crankshaft 135; a check valve 14; a valve plate 141; a lift limiter 142;

an oil separator 2; a third space 20; a first connecting pipe 21; a second connection pipe 22; a third connection pipe 23; a first bypass opening 24; the first oil mist separator 25;

a liquid reservoir 3; a fourth space 30; a fourth connection pipe 31; a fifth connection pipe 32; a second bypass port 33; the second oil mist separator 34;

a flow direction control device 4; a switching valve 41; a first interface 411; a second interface 412; a passage 413; an electromagnet 414; a magnet 415; a spring 416; a first communication pipe 42; the second communication pipe 43;

a valve body support 5; an oil separator holder 6; a reservoir holder 7;

a first heat exchanger 200; a second heat exchanger 300; a throttle device 400; a first fan 500; a second fan 600.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

In addition, in the field of unit air conditioners in north america, a thermostatic expansion valve without pressure relief is generally used as a throttle device, and when a compressor is stopped, the throttle device automatically blocks communication between an exhaust side and an intake side, and the system maximizes the efficiency of a refrigeration cycle apparatus by using waste heat with a fan. Such a throttling device causes a long time for the differential pressure of the refrigeration cycle device to reach the equilibrium pressure, resulting in a failure of the compressor to restart, resulting in a difficulty in adapting the high back pressure compressor to the refrigeration device like the unit type air conditioner. Therefore, it is difficult to apply a high back pressure compressor having a short allowable pressure-equalizing time to a refrigeration cycle apparatus that uses waste heat for the time required for equalizing pressure, and it is difficult to use the high back pressure compressor in the air conditioning field in an area where the efficiency of the refrigeration cycle apparatus is important.

To address at least one of the problems discussed above, the present invention provides a compressor assembly 100.

As shown in fig. 1 and 2, a compressor assembly 100 according to an embodiment of the present invention includes: a compressor 1, an oil separator 2, an accumulator 3 and a flow direction control device 4.

Referring to fig. 3 to 7, the compressor 1 includes a housing 11, a driving portion 12 and a compressing portion 13, a first space 1101 is defined in the housing 11, the driving portion 12 is connected to the compressing portion 13 and is disposed in the first space 1101, the compressing portion 13 defines a second space 130 (i.e., a compression chamber), the housing 11 has an air inlet 1102 and an air outlet 1103, the air inlet 1102 is provided with an air suction pipe 115, the air outlet 1103 is provided with an air discharge pipe 114, an inlet 1301 of the second space 130 is communicated with the air inlet 1102, an outlet 1302 of the second space 130 is communicated with the first space 1101, and the first space 1101 is communicated with the air outlet 1103. Thus, when the driving unit 12 drives the compression unit 13 to perform the compression operation, the compressor 1 will be described as a high-pressure compressor in which the second space 130 can suck the low-pressure refrigerant through the suction port 1301 and compress the low-pressure refrigerant into the high-pressure refrigerant, and then discharge the high-pressure refrigerant into the first space 1101, and the high-pressure refrigerant in the first space 1101 is discharged to the outside of the casing 11 through the discharge port 1103.

Referring to fig. 6 and 7, the oil separator 2 is disposed outside the compressor 1, the oil separator 2 defines a third space 20 communicating with the discharge port 1103, so that the amount of refrigerant oil mixed in the refrigerant discharged from the compressor 1 can be reduced by disposing the oil separator 2 on the discharge side of the compressor 1 to reduce the amount of refrigerant oil discharged from the compressor 1 into the refrigeration apparatus 1000, and the accumulator 3 is disposed outside the compressor 1, the accumulator 3 defines a fourth space 30 communicating with the suction port 1102, so that the liquid refrigerant or the refrigerant oil can be prevented from being sucked into the second space 130 by disposing the accumulator 3 on the suction side of the compressor 1.

As shown in fig. 1 and 2, the flow direction control means 4 communicates with the third space 20 and the fourth space 30, respectively, and is switched between an open state and a closed state, that is, the flow direction control means 4 communicates with the oil separator 2 and the accumulator 3, respectively, and is switchable between a state of communicating and blocking the oil separator 2 and the accumulator 3.

When the flow direction control device 4 is in a closed state, the flow direction control device 4 separates the third space 20 and the fourth space 30, that is, the oil separator 2 is separated from the liquid accumulator 3, and at this time, the high-pressure refrigerant in the oil separator 2 cannot be communicated with the low-pressure refrigerant in the liquid accumulator 3, so that the normal operation and the compression energy efficiency of the compressor 1 are ensured.

When the flow direction control device 4 is in an open state, the flow direction control device 4 is communicated with the third space 20 and the fourth space 30, namely the oil separator 2 is communicated with the liquid accumulator 3, at the moment, a high-pressure refrigerant in the oil separator 2 can be communicated with a low-pressure refrigerant in the liquid accumulator 3, so that the pressure of the air suction side and the air exhaust side of the compressor 1 can be balanced, the compressor 1 can be started and recovered with the compression function instantly after being stopped, the problems of overload and overheating damage of the driving part 12 caused by continuous power supply applied to the compressor 1 are avoided, the problem that an overload protection device of the compressor 1 is damaged due to repeated action is avoided, and the reliability of the compressor 1 is improved.

In addition, the flow direction control device 4 is respectively communicated with the third space 20 and the fourth space 30, and the third space 20 and the fourth space 30 are both gas cavities in the gas-liquid separator, so that the refrigerant flowing through the flow direction control device 4 can be ensured to hardly contain liquid refrigerant or refrigerating machine oil, the liquid refrigerant or refrigerating machine oil can be prevented from remaining in the flow direction control device 4, the working reliability of the flow direction control device 4 can be ensured, the oil spitting rate of the compressor 1 can be reduced, and the working reliability of the compressor 1 can be improved.

In short, according to the compressor assembly 100 of the embodiment of the present invention, the flow direction control device 4 is provided, so as to selectively connect the third space 20 and the fourth space 30, so as to selectively balance the pressure difference between the suction port 1102 and the exhaust port 1103 of the compressor 1, for example, before the compressor 1 is started, if the pressure difference between the suction port 1102 and the exhaust port 1103 is large, the flow direction control device 4 can be switched to the open state, so as to connect the third space 20 and the fourth space 30, so as to reduce the pressure difference between the suction port 1102 and the exhaust port 1103 of the compressor 1, so as to equalize the pressures at the two sides of the suction port 1102 and the exhaust port 1103 of the compressor 1, thereby facilitating the smooth restart and recovery of the compressor 1. In addition, during the normal operation of the compressor 1, the flow direction control device 4 may be switched to the closed state to block the third space 20 and the fourth space 30, so as to ensure the normal operation of the compressor 1, prevent the high-pressure refrigerant discharged from the exhaust port 1103 of the compressor 1 from flowing back to the suction port 1102, and ensure the compression efficiency. Naturally, the invention is not limited thereto, and the flow direction control device 4 can also be switched to the open state according to different actual requirements during normal operation of the compressor 1.

In some embodiments of the present invention, as shown in fig. 6 to 8, the flow direction control device 4 may include: the switching valve 41 has a first connection port 411 and a second connection port 412, the switching valve 41 is switchable between a state in which the first connection port 411 and the second connection port 412 are connected and disconnected, both ends of the first connection pipe 42 are connected to the oil separator 2 and the first connection port 411, respectively, and both ends of the second connection pipe 43 are connected to the accumulator 3 and the second connection port 412, respectively.

Accordingly, when the switching valve 41 is switched to the state in which the first connection port 411 and the second connection port 412 are connected, the first communication pipe 42 and the second communication pipe 43 are connected, and at this time, the oil separator 2 and the accumulator 3 are connected, and the flow direction control device 4 as a whole assumes the above-described open state. When the switching valve 41 is switched to the state of blocking the first connection port 411 and the second connection port 412, the first communication pipe 42 and the second communication pipe 43 are blocked, and at this time, the oil separator 2 is blocked from the accumulator 3, and the entire flow direction control device 4 assumes the closed state described above. Therefore, the flow direction control device 4 is simple in structure, convenient to communicate with the oil separator 2 and the liquid reservoir 3 and good in adaptability.

Here, the type of the switching valve 41 is not limited, and may be, for example, an electromagnetic valve, a diaphragm valve, a hydraulic valve, or the like, and since the specific structure and the operation principle of the switching valve 41 of the above type are common knowledge to those skilled in the art, detailed description thereof is omitted. For example, referring to fig. 8, taking the switching valve 41 as an example of an electromagnetic valve, the electromagnetic valve may have a passage 413 extending in a vertical direction, a side portion of an upper portion of the passage 413 is provided with an electromagnet 414, the passage 413 has a magnet 415 translating in an up-down direction, a lower end of the passage 413 is respectively communicated with the first port 411 and the second port 412, an upper end of the magnet 415 is usually at a position blocking the first port 411 and the second port 412 by a downward elastic force of the spring 416, when the electromagnet 414 is energized, the electromagnet 414 generates a magnetic attraction force to attract the magnet 415 to move up to compress the spring 416, at this time, the lower end of the passage 413 is released to communicate with the first port 411 and the second port 412, and when the electromagnet 414 is de-energized, the electromagnet 414 loses the attraction force, and the magnet 415 returns downward to a blocking position blocking the first port 411 and the second port 412. Therefore, the structure is simple, and the operation reliability is high.

In some embodiments of the present invention, as shown in fig. 1 and 2, the oil separator 2 may be mounted on the compressor 1 through an oil separator bracket 6, the accumulator 3 may be mounted on the compressor 1 through an accumulator bracket 7, and the switching valve 41 is mounted on one of the accumulator 3, the oil separator 2, and the compressor 1 through a valve body bracket 5. Therefore, the oil separator 2, the liquid reservoir 3 and the switching valve 41 are convenient to install, and the switching valve 41 can be close to the liquid reservoir 3 and the oil separator 2 to the greatest extent, so that the pipe lengths of the first communicating pipe 42 and the second communicating pipe 43 can be shortened, the cost input can be reduced, the convenience and the reliability of pipe routing can be improved, the air flow passing rate can be improved, and the instant starting speed of the compressor 1 can be improved better. Of course, the present invention is not limited thereto, and the installation positions of the oil separator 2, the reservoir 3 and the flow direction control device 4 may also be specifically defined according to actual requirements, which will not be described herein.

In some embodiments, as shown in fig. 6, the bottom of the first space 1101 has an oil sump 1104, the top wall of the oil separator 2 is provided with a first connecting pipe 21 and a second connecting pipe 22, the bottom wall is provided with a third connecting pipe 23, the side wall is provided with a first bypass port 24, the first connecting pipe 21 is communicated with the exhaust port 1103, the second connecting pipe 22 is communicated with a refrigerant flow path in the refrigeration system (for example, communicated with the first heat exchanger 200 in the refrigeration equipment 1000 described later), the third connecting pipe 23 is communicated with the oil sump 1104, the first connecting pipe 42 is communicated with the first bypass port 24, the third space 20 is provided with a first oil mist separator 25 therein, a pipe end of the first connecting pipe 21 inserted into the third space 20 is positioned above the first oil mist separator 25, the pipe end of the second connection pipe 22 inserted into the third space 20, the pipe end of the third connection pipe 23 inserted into the third space 20, and the first bypass port 24 are located below the first oil mist separator 25.

Thus, the high-pressure refrigerant discharged from the discharge port 1103 of the compressor 1 may enter the upper portion of the first oil mist separator 25 in the third space 20 through the discharge pipe 114 and the first connection pipe 21, the liquid refrigerant and the refrigerating machine oil in the refrigerant may be separated by the first oil mist separator 25, collected to the bottom portion of the oil separator 2 along the inner wall of the oil separator 2, and returned to the oil sump 1104 of the compressor 1 through the third connection pipe 23, and the separated gaseous refrigerant may pass below the first oil mist separator 25, a portion of which may be discharged along the second connection pipe 22 through the pipe end of the second connection pipe 22, and a portion of which may enter the first connection pipe 42 of the flow direction control device 4 through the first bypass port 24.

From this, the position that sets up of first bypass port 24 can not cause the mutual interference influence with the installation of other connecting pipes to easy to assemble, moreover, through setting up first bypass port 24 in the below of first oil mist separator 25, can also guarantee as far as possible that the refrigerant that enters into flow control device 4 does not contain liquid refrigerant and refrigerator oil, improves the reliability that flows to control device 4, and reduces compressor 1's the oil yield, improves compressor 1's reliability.

Optionally, the first bypass port 24 is located in an upper middle portion of the oil separator 2. This makes it possible to prevent the refrigerant oil at the bottom of the oil separator 2 from entering the flow direction control device 4, thereby further improving the operational reliability of the flow direction control device 4, reducing the oil discharge rate of the compressor 1, and improving the reliability of the compressor 1.

In some embodiments, as shown in fig. 7, a fourth connecting pipe 31 is formed through a top wall of the accumulator 3, a fifth connecting pipe 32 is formed through a bottom wall of the accumulator, and a second bypass port 33 is formed through a side wall of the accumulator, the fourth connecting pipe 31 is communicated with a refrigerant flow path in the refrigeration system (for example, communicated with a second heat exchanger 300 in the refrigeration equipment 1000 described later), the fifth connecting pipe 32 is communicated with the suction port 1102, the second communicating pipe 43 is communicated with the second bypass port 33, the fourth space 30 is provided with the second oil mist separator 34, a pipe end of the fourth connecting pipe 31 inserted into the fourth space 30 is located above the second oil mist separator 34, and a pipe end of the fifth connecting pipe 32 inserted into the fourth space 30 and the second bypass port 33 are located below the second oil mist separator 34.

Thus, the refrigerant from the refrigeration equipment 1000 may enter the fourth space 30 above the second oil mist separator 34 through the fourth connection pipe 31, the liquid refrigerant and the refrigerator oil in the refrigerant may be separated by the second oil mist separator 34 and collected to the bottom of the accumulator 3 along the inner wall of the accumulator 3, and the separated gaseous refrigerant may pass below the second oil mist separator 34, and a portion of the separated gaseous refrigerant may be supplied into the second space 130 through the pipe end of the fifth connection pipe 32 along the fifth connection pipe 32 and the suction pipe 115, and a portion of the separated gaseous refrigerant may enter the second communication pipe 43 of the flow direction control device 4 through the second bypass port 33.

Therefore, the installation position of the second bypass port 33 does not interfere with the installation of other connecting pipes, so that the installation is convenient, and the second bypass port 33 is arranged below the second oil mist separator 34, so that the refrigerant entering the flow direction control device 4 can be ensured to be free from liquid refrigerant and refrigerating machine oil as much as possible, the reliability of the flow direction control device 4 is improved, the oil discharge rate of the compressor 1 is reduced, and the reliability of the compressor 1 is improved.

Optionally, the second bypass port 33 is located in the upper middle portion of the reservoir 3. This makes it possible to prevent the refrigerating machine oil at the bottom of the accumulator 3 from entering the flow direction control device 4, and to further improve the operational reliability of the flow direction control device 4, reduce the oil discharge rate of the compressor 1, and improve the reliability of the compressor 1.

Here, it is understood that the structures of the first oil mist separator 25 and the second oil mist separator 34 according to the embodiment of the present invention are well known to those skilled in the art, and may be, for example, a filter screen, a filter membrane, etc., as long as the oil mist separation function can be achieved, and the structures are not limited and described in detail herein.

In some embodiments of the present invention, the compressor 1 may further include a check valve 14, where the check valve 14 is configured to limit a unidirectional flow of the refrigerant in the second space 130 to the first space 1101, that is, by providing the check valve 14, the refrigerant in the first space 1101 cannot flow backwards to the second space 130. Optional types of one-way valves 14 are known to those skilled in the art, and may be, for example, on-off valves, diaphragm valves, etc. As shown in fig. 5, when the check valve 14 is a diaphragm valve, the check valve 14 may include a lift stopper 142 and a valve plate 141, the valve plate 141 may be normally stopped at an outlet 1302 of the second space 130, the valve plate 141 may be pushed open to be discharged from the outlet 1302 when a pressure of refrigerant in the outlet 1302 is greater than a predetermined value, the valve plate 141 may be stopped at the outlet 1302 again to close the outlet 1302 under an elastic restoring force of the valve plate 141 when the pressure of refrigerant in the outlet 1302 is less than or equal to the predetermined value, and the lift stopper 142 may be configured to limit a maximum opening angle of the valve plate 141.

In some embodiments of the present invention, the flow direction control device 4 may be configured to detect a pressure difference between the exhaust port 1103 and the suction port 1102 before the compression part 13 is loaded with a compression load, and if the detected pressure difference is greater than or equal to a reference value, the flow direction control device 4 is switched to an open state in which the oil separator 2 and the reservoir 3 are communicated, and the driving part 12 is started with a delay, thereby preventing a safety problem caused by the compressor 1 not being smoothly restarted. Alternatively, the reference value may be equal to or greater than 0.05MPa, for example, the reference value is set to 0.2MPa, 0.4MPa, 0.6MPa, 0.9MPa, 1.23MPa, 2MPa, or the like, whereby the start time of the driving part 12 is regulated and the state of the flow direction control device 4 is adjusted accordingly according to the result of the actually detected pressure difference, thereby avoiding the problem of difficult or hard start of the compressor 1.

In some embodiments of the present invention, the flow direction control device 4 may be configured to switch to a closed state for blocking the oil separator 2 and the reservoir 3 when the compression unit 13 is loaded with a compression load (i.e., when the driving unit 12 starts to drive the compression unit 13 to operate), and switch to an open state for communicating the oil separator 2 and the reservoir 3 when the compression unit 13 is unloaded with the compression load (i.e., when the driving unit 12 stops driving the compression unit 13 to operate), so as to ensure pressure balance between the suction port 1102 and the exhaust port 1103 of the compression unit 13 after the compressor 1 is stopped, reduce a pressure difference between the suction port 1102 and the exhaust port 1103, and ensure that the compressor 1 can be restarted smoothly and returns to the compression operation immediately. In this way, since the flow direction control device 4 and the driving unit 12 operate simultaneously, there is no pressure difference between the suction port 1102 and the discharge port 1103, and the normal and stable operation of the compressor 1 can be ensured without the need for the detection process in the previous stage. However, in order to further ensure the normal and stable operation of the compressor 1, the embodiment in this paragraph may also perform the pressure difference detection, thereby improving the stability of the operation of the compressor 1. It should be noted that the flow direction control device 4 and the driving portion 12 in this paragraph may be controlled by the same electric controller to operate synchronously, or may be controlled by different electric controllers respectively to operate independently.

In some embodiments of the present invention, the compressor 1 may further include: and a detection unit which is in signal communication with the drive unit 12 and detects the state of the flow direction control device 4. In this way, the state of the flow direction control device 4 can be detected by the detection portion both before and after the activation of the drive portion 12. For example, it can be ensured that the flow direction control device 4 is in an open state before the driving portion 12 is started, and that the flow direction control device 4 is in a closed state after the driving portion 12 is started, so that the compressor 1 can be smoothly restarted in an early stage and can normally work in a later stage, and thus the working stability and reliability of the compressor 1 can be improved, and the damage risk and energy loss of the compressor 1 can be reduced. Of course, the present invention is not limited to this, and in other embodiments of the present invention, the driving portion 12 may also perform other actions according to the detection result of the detecting portion, which is not described herein again.

It should be noted that the type of the compressor 1 according to the embodiment of the present invention is not limited, and the compressor may be a high back pressure compressor, such as a vertical compressor, a horizontal compressor, a reciprocating compressor, a rotary compressor, etc., the structure and the operation principle of the compressor 1 are well known to those skilled in the art, and only one rotary compressor shown in fig. 7 is taken as an example to briefly describe below, and of course, the present invention is not limited to the following examples.

As shown in fig. 7, the compressor 1 may include: the driving part 12 may include a rotor 122 and a stator 121, the rotor 122 may be rotatably disposed in the stator 121, the main bearing 133 and the sub bearing 134 are disposed at both axial sides of the cylinder 132 to define a second space 130 with the cylinder 132, a lower end of the crankshaft 135 penetrates the second space 130, the piston 131 is sleeved on the crankshaft 135 and is fitted in the second space 130, the sliding vane reciprocates and slides along a radial direction of the second space 130, a tip of the sliding vane abuts against the piston 131 to divide the third space 20 into a suction chamber and an exhaust chamber which are periodically switched together with the piston 131, an upper end of the crankshaft 135 is connected to the rotor 122, the casing 11 includes an upper casing 111, a middle casing 112 and a lower casing 113, the middle casing 112 is cylindrical, the upper casing 111 is sealed at a top of the middle casing 112, the lower casing 113 is sealed at a bottom of the middle casing 112, at this time, a first space 1101 is defined between the upper casing 111, the middle casing 112, and the lower casing 113, and the stator 121 and the main bearing 133 are respectively fixed to an inner circumferential wall of the middle casing 112.

Therefore, after the driving unit 12 is started, the rotor 122 drives the crankshaft 135 to rotate, the crankshaft 135 drives the piston 131 to roll in the second space 130, and the second piston 131 pushes the sliding vane to move in a reciprocating manner, so that the volume change and the alternate conversion of the suction cavity and the discharge cavity are realized, the refrigerant in the liquid reservoir 3 can be sucked into the second space 130, the refrigerant compressed in the second space 130 can be discharged into the first space 1101, and the high-pressure refrigerant in the first space 1101 can be discharged into the oil separator 2.

Next, referring to fig. 9, a refrigeration apparatus 1000 according to an embodiment of the present invention is described.

As shown in fig. 9, the cooling apparatus 1000 includes: the compressor assembly 100, the first heat exchanger 200 (for example, a condenser), the second heat exchanger 300 (for example, an evaporator), and the throttling device 400, wherein the compressor assembly 100, the first heat exchanger 200, the throttling device 400, and the second heat exchanger 300 are connected in a circulation loop, and the compressor assembly 100 is the compressor assembly 100 of any of the above embodiments. In addition, when the cooling apparatus 1000 further has a heating function, the cooling apparatus 1000 may further include a four-way valve (not shown) and the like. In addition, in order to improve the heat exchange effect of the refrigeration apparatus 1000, a first fan 500, a second fan 600, and the like may be further included.

Therefore, the compressor assembly 100 can be restarted and recovered to compression work instantly after power failure, so that the refrigeration equipment 1000 with the compressor assembly can be started and operated instantly after power failure, refrigeration and heating effects can be rapidly generated, and user requirements can be met. More specifically, after the refrigeration apparatus 1000 is turned off, in a state where the compressor 1 stops operating, the flow direction control device 4 may timely balance a pressure difference between the air suction port 1102 and the air discharge port 1103 of the compressor 1, so that rapid restart of the compressor 1 becomes possible, and prevent an overload protection device of the compressor 1 from being damaged, thereby preventing the compressor 1 from being damaged by overheating, thereby improving reliability of the compressor 1, improving service life of the refrigeration apparatus 1000, and reducing energy consumption and duration for restarting the refrigeration apparatus 1000.

In addition, it should be noted that the specific type of the refrigeration apparatus 1000 according to the embodiment of the present invention is not limited, and may be, for example, a general air conditioner, a unit air conditioner (unitary air-conditioner), an air purifier, a refrigerator, and the like.

Next, a specific example according to the present invention will be described by taking the refrigerating apparatus 1000 as a unit type air conditioner as an example.

As shown in fig. 9, the refrigeration apparatus 1000 includes a compressor assembly 100, a first heat exchanger 200, a throttling device 400 (e.g., an expansion valve), a second heat exchanger 300, a first fan 500, and a second fan 600, wherein the compressor assembly 100, the first heat exchanger 200, and the first fan 500 are disposed outdoors, and the second heat exchanger 300, the second fan 600, and the throttling device 400 are disposed indoors. The high-pressure refrigerant discharged from the compressor 1 moves to the first heat exchanger 200 through the oil separator 2, the refrigerant is condensed in the first heat exchanger 200, passes through the expansion device 400, is expanded, passes through the second heat exchanger 300, is re-sucked into the compressor 1 through the accumulator 3 in an evaporated state, is compressed into a high-pressure refrigerant in the compressor 1, and is discharged again, and thus the refrigeration cycle process is repeated.

The flow direction control device 4 is for communicating and blocking the oil separator 2 and the accumulator 3, and therefore, when the suction pressure Ps of the compressor 1 is too low and the pressure difference between the suction pressure Ps and the discharge pressure Pd is too large (for example, greater than 0.05 MPa), the suction pressure Ps cannot open the check valve 14, the refrigerant in the second space 130 cannot be discharged to the first space 1101, and the refrigerant in the first space 1101 cannot be discharged to the third space 20, and at this time, an overload is generated in the driving unit 12, and the overload protection device stops the driving unit 12, so that the compression load of the driving unit 12 on the compression unit 13 is unloaded, and the compressor 1 cannot be restarted immediately to perform the refrigerant compression operation, and if the pressure difference between the suction pressure Ps and the discharge pressure Pd is decreased for a long time, leakage of the compressor 1 is increased. In view of the above technical problems, the present invention creatively provides a flow direction control device 4 disposed between the oil separator 2 and the reservoir 3 to rapidly balance the suction pressure Ps and the discharge pressure Pd, so that the compressor 1 can be restarted smoothly and rapidly, and the compression operation is resumed, thereby meeting the use requirements of users.

In addition, the present invention was also tested by taking the compressor unit 100 removed from the lower flow direction control unit 4 as a first test sample and the compressor unit 100 mounted to the upper flow direction control unit 4 as a second test sample, and the following comparative results were obtained.

When the first test sample is tested, when the compressor 1 is stopped, the exhaust pressure Pd of the compressor 1 is slowly and continuously reduced, the suction pressure Ps is maintained after being temporarily increased, it takes about 20 minutes, and the differential pressure Δ P between the suction pressure Ps and the exhaust pressure Pd can be reduced to within 0.05MPa, then, when the differential pressure Δ P between the suction pressure Ps and the exhaust pressure Pd is greater than 0.05MPa, if the compressor 1 is energized, the compression unit 13 cannot operate, the drive unit 12 generates an overcurrent, the overload protection device performs a protection operation, and after the overload protection device is recovered, the drive unit 12 is continuously energized again to energize the compressor 1, but if the differential pressure Δ P cannot be reduced to within 0.05MPa to satisfy a balance pressure condition at this time, the above-mentioned power-off protection operation is repeatedly performed, and thus, since the differential pressure Δ P needs to be reduced to 0.05MPa after about 20 minutes to satisfy the balance condition, therefore, the compressor 1 needs about 20 minutes to restart and recover the compression work, which seriously affects the user experience. In addition, in these 20 minutes, the overload protection device and the driving unit 12 are repeatedly operated, and thus the problem of damage due to overheating is likely to occur, which affects the service life and reliability of the compressor 1.

When the second test sample is tested, when the compressor 1 is stopped, the flow direction control device 4 can be adopted to communicate the air suction port 1102 of the compressor 1 with the exhaust port 1103, so that the pressure difference Δ P between the suction pressure Ps and the exhaust pressure Pd of the compressor 1 is rapidly reduced to be within 0.05MPa, and the pressure balance condition is rapidly met, at this time, the compressor 1 is powered on, and because the pressure difference Δ P inside the compressor 1 already meets the balance pressure condition, the compression part 13 can perform the exhaust action, and the compressor 1 can directly perform the compression work, i.e., the operation is restarted.

Through the comparison, it is obvious that, compared with the test result of the first test sample, when the second test sample is tested, the compressor 1 can perform the compression operation again only within a short time (much less than 20 minutes), and even can achieve the effect of instant restart, or, compared with the test result of the first test sample, when the second test sample is tested, within the same time period (for example, within 20 minutes), the compressor 1 in the first test sample can perform the compression operation only once, and the compressor 1 in the second test sample can be repeatedly powered off and restarted for multiple times.

In addition, when the power failure restart test is performed on the second test sample, the drive unit 12 and the overload protection device in the compressor 1 do not operate repeatedly many times, so that not only can the power consumption be reduced, but also the overload protection device can be prevented from being damaged, and the problem that the drive unit 12 is damaged due to overheating can be prevented, so that the reliability of the compressor 1 can be improved.

In summary, the time consumed by restarting the compression action of the compressor 1 according to the embodiment of the present invention is much shorter than the time consumed by restarting the compression action of the conventional compressor 1, so that the refrigeration apparatus 1000 according to the embodiment of the present invention can be almost instantly realized without waiting for a long time by a user, thereby improving user experience, and the energy consumption of restarting the compression action of the compressor according to the embodiment of the present invention is much less than the energy consumption of restarting the compression action of the conventional compressor 1, so that the energy saving effect of restarting the heat exchange operation of the refrigeration apparatus 1000 according to the embodiment of the present invention is very significant, the energy consumption is less, the action reliability is higher, and the service life of the refrigeration apparatus 1000 is longer.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be directly connected to one another or indirectly connected through intervening media, or may be interconnected between two elements or in an interactive relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A compressor assembly, comprising:

the compressor comprises a shell, a driving part and a compression part, wherein a first space is defined in the shell, the driving part is connected with the compression part and is arranged in the first space, the compression part defines a second space, an air suction port and an air exhaust port are arranged on the shell, an inlet of the second space is communicated with the air suction port, an outlet of the second space is communicated with the first space, and the first space is communicated with the air exhaust port;

an oil separator disposed outside the compressor, the oil separator defining a third space in communication with the exhaust port;

the liquid storage device is arranged outside the compressor and limits a fourth space communicated with the air suction port;

and the flow direction control device is communicated with the third space and the fourth space respectively and is switched between an opening state and a closing state, the flow direction control device is communicated with the third space and the fourth space in the opening state, and the flow direction control device is used for isolating the third space and the fourth space in the closing state.

2. The compressor assembly of claim 1, wherein the flow direction control device comprises:

the switching valve is provided with a first interface and a second interface and can be switched between the states of communicating and isolating the first interface and the second interface;

the two ends of the first communication pipe are respectively communicated with the oil separator and the first interface;

and the two ends of the second communicating pipe are respectively communicated with the liquid storage device and the second interface.

3. The compressor assembly of claim 2, wherein the oil separator is mounted to the compressor by an oil separator bracket, the accumulator is mounted to the compressor by an accumulator bracket, and the switching valve is mounted to one of the compressor, the accumulator, and the oil separator by a valve body bracket.

4. The compressor assembly of claim 2, wherein the switching valve is a solenoid valve, or a diaphragm valve, or a hydraulic valve.

5. The compressor assembly according to claim 2, wherein an oil sump is provided at a bottom of the first space, a first oil mist separator is provided in the third space, a first connection pipe and a second connection pipe are provided on a top wall of the oil separator, a third connection pipe is provided on a bottom wall of the oil separator, a first bypass port is formed on a side wall of the oil separator, one end of the first connection pipe is communicated with the exhaust port, the other end of the first connection pipe is inserted into the third space and positioned above the first oil mist separator, one end of the second connection pipe is communicated with a refrigerant passage in a refrigeration system, the other end of the second connection pipe is inserted into the third space and positioned below the first oil mist separator, one end of the third connection pipe is communicated with the oil sump, the other end of the third connection pipe is inserted into the third space and positioned below the first oil mist separator, and the first bypass port is communicated with the first bypass port, the first bypass port is located below the first oil mist separator.

6. The compressor assembly of claim 5, wherein the first bypass port is located at an upper-middle portion of the oil separator.

7. The compressor assembly according to claim 2, wherein a second oil mist separator is disposed in the fourth space, a fourth connecting pipe is disposed through a top wall of the accumulator, a fifth connecting pipe is disposed through a bottom wall of the accumulator, and a second bypass port is formed in a side wall of the accumulator, one end of the fourth connecting pipe is communicated with a refrigerant flow path in the refrigeration system, the other end of the fourth connecting pipe is inserted into the fourth space and is located above the second oil mist separator, one end of the fifth connecting pipe is communicated with the suction port, the other end of the fifth connecting pipe is inserted into the fourth space and is located below the second oil mist separator, the second communicating pipe is communicated with the second bypass port, and the second bypass port is located below the second oil mist separator.

8. The compressor assembly of claim 7, wherein the second bypass port is located in an upper-middle portion of the accumulator.

9. The compressor assembly of claim 1, wherein the compressor further comprises: and the detection part is in signal transmission with the driving part and is used for detecting the state of the flow direction control device.

10. A control method of a compressor assembly, characterized in that the compressor assembly is a compressor assembly according to any one of claims 1-9, the control method comprising:

when the compression part loads a compression load, the flow direction control device is switched to the closed state;

when the compression unit unloads a compression load, the flow direction control device is switched to the open state.

11. A control method of a compressor assembly, characterized in that the compressor assembly is a compressor assembly according to any one of claims 1-9, the control method comprising:

before the compression part loads compression load, the pressure difference between the exhaust port and the suction port is detected, if the detected pressure difference is larger than or equal to a reference value, the flow direction control device is switched to the opening state, and the driving part is started in a delayed mode.

12. A refrigeration apparatus, comprising: a compressor assembly, a first heat exchanger, a second heat exchanger, and a throttling device, the compressor assembly, the first heat exchanger, the throttling device, and the second heat exchanger being connected in a circulation loop, the compressor assembly being in accordance with any one of claims 1-9.