阅读说明：本技术 一种压缩机、冰箱和控制方法 (Compressor, refrigerator and control method ) 是由 胡余生 魏会军 何杰伟 徐敏 陈娟娟 冯海 于 2020-12-28 设计创作，主要内容包括：本公开提供一种压缩机、冰箱和控制方法,压缩机包括：第一气缸和第二气缸,其中所述第一气缸的排量大于所述第二气缸的排量,所述第一气缸能够单独工作,所述第二气缸也能够单独工作,所述第一气缸和所述第二气缸还能够串联连通形成至少两级压缩。根据本公开压缩机可单独运行小排量压缩或大排量压缩或双缸双级压缩的方式,满足不同容积范围的冰箱系统对于不同冷量的需求,实现单压缩机排量可变方式,还可实现双级压缩,能满足特定制冷系统更大的运行压比的需求,能够实现制冷系统的高效深冻功能。(The present disclosure provides a compressor, a refrigerator and a control method, the compressor including: the first cylinder and the second cylinder can be communicated in series to form at least two stages of compression. According to the compressor disclosed by the invention, the mode of small-displacement compression, large-displacement compression or double-cylinder double-stage compression can be independently operated, the requirements of refrigerator systems with different volume ranges on different cooling capacities are met, the mode of single-compressor displacement variation is realized, double-stage compression can also be realized, the requirement of a specific refrigerating system for larger operation pressure ratio can be met, and the efficient deep freezing function of the refrigerating system can be realized.)

1. A compressor, characterized by: the method comprises the following steps:

a first cylinder (11) and a second cylinder (12), wherein the displacement of the first cylinder (11) is greater than the displacement of the second cylinder (12), the first cylinder (11) being capable of operating alone, the second cylinder (12) also being capable of operating alone, the first cylinder (11) and the second cylinder (12) also being capable of communicating in series to form at least two stages of compression.

2. The compressor of claim 1, wherein:

the compressor is a piston compressor and comprises a first piston (21) and a second piston (22), wherein the first piston (21) is matched with the first cylinder (11) and can reciprocate in the first cylinder (11), and the second piston (22) is matched with the second cylinder (12) and can reciprocate in the second cylinder (12).

3. The compressor of claim 2, wherein:

still include first connecting rod (31), second connecting rod (32) and bent axle (4), first connecting rod (31) one end with first piston (21) are connected, the other end with bent axle (4) are connected, second connecting rod (32) one end with second piston (22) are connected, the other end with bent axle (4) are connected.

4. A compressor according to claim 3, wherein:

the first connecting rod (31) is sleeved on the crankshaft (4), and the second connecting rod (32) is also sleeved on the crankshaft (4); and/or the first connecting rod (31) and the second connecting rod (32) are arranged in a staggered mode along the axial direction of the crankshaft (4).

5. The compressor according to any one of claims 1 to 4, wherein:

a first air suction pipe (51) can be communicated with and arranged on an air suction port of the first air cylinder (11), and a first air exhaust pipe (61) can be communicated and arranged on an air exhaust port of the first air cylinder (11); and a second air suction pipe (52) can be communicated with an air suction port of the second cylinder (12), and a second air exhaust pipe (62) can be communicated with an air exhaust port of the second cylinder (12).

6. The compressor of claim 5, wherein:

a first exhaust silencer (71) is arranged between the exhaust port of the first cylinder (11) and the first exhaust pipe (61) in a communication manner; a second exhaust silencer (72) is arranged between the exhaust port of the second cylinder (12) and the second exhaust pipe (62) in a communication manner; and/or the presence of a gas in the gas,

a first air suction silencer (81) is arranged between the air suction port of the first cylinder (11) and the first air suction pipe (51) in a communication manner; and a second air suction silencer (82) is arranged between the air suction port of the second cylinder (12) and the second air suction pipe (52) in a communication manner.

7. A refrigerator, characterized in that: comprising a compressor according to any one of claims 1 to 6.

8. The refrigerator according to claim 7, wherein:

when comprising a first aspiration duct (51) and a second aspiration duct (52):

also comprises a condenser (6), an evaporator (7), a throttling device (8), a first pipeline (101), a second pipeline (102) and a third pipeline (103), one end of the condenser (6) is communicated to one end of the throttling device (8), the other end of the throttling device (8) is communicated with one end of the evaporator (7), the other end of the evaporator (7) is communicated with the first pipeline (101), one end of the second pipeline (102) is communicated to the first air suction pipe (51), the other end is communicated with the first pipeline (101), one end of the third pipeline (103) is communicated to the second air suction pipe (52), and the other end is communicated to the first pipeline (101), and a first three-way valve (91) is arranged at the joint position of the first pipeline (101), the second pipeline (102) and the third pipeline (103).

9. The refrigerator according to claim 8, wherein:

when a first exhaust pipe (61) and a second exhaust pipe (62) are included:

still include fourth pipeline (104) and fifth pipeline (105), the one end of fourth pipeline (104) with first blast pipe (61) intercommunication, the other end with condenser (6) intercommunication, the one end of fifth pipeline (105) with second blast pipe (62) intercommunication, the other end also with condenser (6) intercommunication.

10. The refrigerator according to claim 8, wherein:

when a first exhaust pipe (61) and a second exhaust pipe (62) are included:

the exhaust system further comprises a third exhaust pipe (63) and a fourth exhaust pipe (64), one end of the third exhaust pipe (63) can be communicated with the exhaust port of the first cylinder (11), the other end of the third exhaust pipe can be communicated with one end of the fourth exhaust pipe (64), and the other end of the fourth exhaust pipe (64) can be communicated with the first exhaust pipe (61);

the exhaust system also comprises a fifth exhaust pipe (65), one end of the fifth exhaust pipe (65) is communicated to the third exhaust pipe (63), the other end of the fifth exhaust pipe can be communicated to the second air suction pipe (52), the fifth exhaust pipe (65), the third exhaust pipe (63) and the fourth exhaust pipe (64) are communicated together, and a second three-way valve (92) is further arranged at the position where the fifth exhaust pipe, the third exhaust pipe and the fourth exhaust pipe are communicated together;

the exhaust gas purification device further comprises a sixth pipeline (106), one end of the sixth pipeline (106) is communicated with the second gas suction pipe (52), the other end of the sixth pipeline is communicated with the third pipeline (103), the fifth exhaust pipe (65), the sixth pipeline (106) and the third pipeline (103) are communicated together, and a third three-way valve (93) is further arranged at the position where the fifth exhaust pipe, the sixth pipeline (106) and the third pipeline (103) are communicated together.

11. A control method of a refrigerator according to any one of claims 7 to 10, characterized in that: the method comprises the following steps:

the method comprises the following steps of detecting working conditions of the refrigerator, such as the required working volume and/or the refrigerating temperature;

judging whether the working volume of the refrigerator is within a first volume range or a second volume range, wherein the first volume range is larger than the second volume range; and/or judging whether the refrigerating temperature of the refrigerator is lower than a preset temperature or not;

controlling, namely controlling to open the first cylinder and close the second cylinder when the refrigerator is judged to work within the first volume range; when the refrigerator is judged to need to work within the second volume range, controlling to open a second cylinder and close the first cylinder; and/or when the refrigeration temperature of the refrigerator is judged to be less than or equal to the preset temperature, the first air cylinder and the second air cylinder are controlled to be connected in series, and when the refrigeration temperature of the refrigerator is judged to be more than the preset temperature, the first air cylinder and the second air cylinder are controlled not to be connected in series.

12. The control method according to claim 11, characterized in that:

when including first three-way valve (91), second three-way valve (92) and third three-way valve (93), and still include first breathing pipe (51) and second breathing pipe (52), and evaporimeter (7), first pipeline, second pipeline, third pipeline, first blast pipe, third blast pipe and fourth blast pipe:

and in the control step, when the refrigerator is judged to need to work within the first volume range, the first three-way valve (91) is controlled to enable the first pipeline (101) to be communicated with the second pipeline (102) and simultaneously enable the first pipeline (101) to be not communicated with the third pipeline (103), the second three-way valve (92) is controlled to enable the third exhaust pipe to be communicated with the fourth exhaust pipe, the evaporator (7) is enabled to be communicated with the first air suction pipe (51), the first air cylinder (11) works in air suction mode and discharges air through the third exhaust pipe, the fourth exhaust pipe and the first exhaust pipe, the evaporator (7) is not communicated with the second air suction pipe (52), and the second air cylinder (12) does not work in air suction mode.

13. The control method according to claim 11 or 12, characterized in that:

when including first three-way valve, second three-way valve and third three-way valve, and still include first breathing pipe (51) and second breathing pipe (52), and evaporimeter (7), first pipeline, second pipeline, third pipeline, second blast pipe and sixth pipeline:

and in the control step, when the refrigerator needs to work in the second volume range, the first three-way valve (91) is controlled to enable the first pipeline (101) to be communicated with the third pipeline (103), the first pipeline (101) is not communicated with the second pipeline (102), the third three-way valve (93) is controlled to enable the sixth pipeline (106) to be communicated with the third pipeline (103), the evaporator (7) is communicated with the second air suction pipe (52), the second air cylinder (12) works in a suction mode and discharges air through the second air discharge pipe, the evaporator (7) is not communicated with the first air suction pipe (51), and the first air cylinder (11) does not work in a suction mode.

14. The control method according to any one of claims 11 to 13, characterized in that:

when including first three-way valve (91), second three-way valve (92) and third three-way valve (93), and still include first breathing pipe (51) and second breathing pipe (52), and evaporimeter (7), first pipeline, second pipeline, third blast pipe, fourth blast pipe, fifth blast pipe and sixth pipeline:

the control step is also used for controlling the first three-way valve (91) to enable the first pipeline (101) to be communicated with the second pipeline (102) and the evaporator (7) to be communicated with the first air suction pipe (51) when the refrigerating temperature of the refrigerator is judged to be lower than the preset temperature, the first air cylinder (11) performs air suction operation,

while controlling the second three-way valve (92) so that the third exhaust pipe (63) is communicated with the fifth exhaust pipe (65) and the fourth exhaust pipe (64) is disconnected,

and simultaneously controlling the third three-way valve (93) to enable the fifth exhaust pipe (65) to be communicated with the sixth pipeline (106) and the third pipeline (103) to be disconnected, so that the exhaust gas of the first cylinder (11) is communicated to the suction gas of the second cylinder (12), and the second cylinder (12) is also in suction operation.

Technical Field

The disclosure relates to the technical field of compressors, in particular to a compressor, a refrigerator and a control method.

Background

As is known, when a terminal refrigeration system selects and matches compressors, the corresponding compressor is selected mainly according to the cooling load required by the system. However, the large span of the refrigerator volume range means that the range of the cooling load required by the system is large, but the types and models of the existing compressors are limited, and a single compressor with the same displacement can only meet the requirement of matching the refrigerator system in a specific volume range. Therefore, to obtain an optimal matching scheme, it is necessary to customize each type of refrigerator system with its corresponding required displacement pump body, but the cost is high.

In addition, as the income level of people increases, the demand for the deep freezing refrigerator is increasingly highlighted. The deep freezing refrigerator can realize freezing at lower temperature, and the protection period for special food can be longer. Except for the large piston compressor, most of the rest small reciprocating piston compressors are single-cylinder single-stage compressors. The single-stage piston compressor is limited by the suction-discharge pressure ratio, deep freezing below-33 ℃ is difficult to realize after the refrigerator system is matched, and meanwhile, the single-stage compressor has high discharge temperature under the working condition of large pressure ratio and has the problem of reliability. For deep freezing below-33 ℃, refrigerants like R410a, R404a and R290 can be directly prepared by a single stage at present, but are not applied to a large scale in household refrigerators due to the physical properties of the refrigerants. The R600a refrigerant currently used in domestic refrigerator applications needs to be reduced to below-33 c, requiring a system employing two-stage compression to ensure both energy efficiency and temperature reduction.

The compressor in the prior art cannot meet the requirements of refrigerator systems with different volume ranges on different cooling capacities, cannot realize a single-compressor displacement variable mode and the like, so that the compressor, the refrigerator and the control method are researched and designed according to the disclosure.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

Therefore, the technical problem to be solved by the present disclosure is to overcome the defects that the compressor in the prior art cannot meet the requirements of the refrigerator systems with different volume ranges on different cooling capacities, and cannot realize a single compressor displacement variable mode, so as to provide a compressor, a refrigerator and a control method.

In order to solve the above problem, the present disclosure provides a compressor, including:

the first cylinder and the second cylinder can be communicated in series to form at least two stages of compression.

In some embodiments, the compressor is a piston compressor comprising a first piston cooperating with and reciprocable in the first cylinder and a second piston cooperating with and reciprocable in the second cylinder.

In some embodiments, the piston further comprises a first connecting rod, a second connecting rod, and a crankshaft, wherein one end of the first connecting rod is connected with the first piston, the other end of the first connecting rod is connected with the crankshaft, one end of the second connecting rod is connected with the second piston, and the other end of the second connecting rod is connected with the crankshaft.

In some embodiments, the first connecting rod is sleeved on the crankshaft, and the second connecting rod is also sleeved on the crankshaft; and/or the first connecting rod and the second connecting rod are arranged along the axial direction of the crankshaft in a staggered mode.

In some embodiments, the air inlet of the first cylinder can be communicated with a first air inlet pipe, and the air outlet of the first cylinder can be communicated with a first air outlet pipe; and the air suction port of the second air cylinder can be communicated with a second air suction pipe, and the air exhaust port of the second air cylinder can be communicated with a second air exhaust pipe.

In some embodiments, a first exhaust muffler is further disposed in communication between the exhaust port of the first cylinder and the first exhaust pipe; a second exhaust silencer is arranged between the exhaust port of the second cylinder and the second exhaust pipe in a communicated manner; and/or the presence of a gas in the gas,

a first air suction muffler is also arranged between the air suction port of the first air cylinder and the first air suction pipe in a communicated manner; and a second air suction muffler is also arranged between the air suction port of the second cylinder and the second air suction pipe in a communicating manner.

The present disclosure also provides a refrigerator including the compressor of any one of the foregoing.

In some embodiments, when comprising a first inhalation duct and a second inhalation duct:

the condenser comprises a condenser, an evaporator and a throttling device, and further comprises a first pipeline, a second pipeline and a third pipeline, wherein one end of the condenser is communicated to one end of the throttling device, the other end of the throttling device is communicated with one end of the evaporator, the other end of the evaporator is communicated with the first pipeline, one end of the second pipeline is communicated to the first air suction pipe, the other end of the second pipeline is communicated with the first pipeline, one end of the third pipeline is communicated to the second air suction pipe, the other end of the third pipeline is communicated to the first pipeline, and a first three-way valve is arranged at the joint position of the first pipeline, the second pipeline and the third pipeline.

In some embodiments, when including the first exhaust pipe and the second exhaust pipe:

still include fourth pipeline and fifth pipeline, the one end of fourth pipeline with first blast pipe intercommunication, the other end with the condenser intercommunication, the one end of fifth pipeline with second blast pipe intercommunication, the other end also with the condenser intercommunication.

In some embodiments, when including first and second exhaust pipes and a second intake pipe:

the exhaust system further comprises a third exhaust pipe and a fourth exhaust pipe, wherein one end of the third exhaust pipe can be communicated to the exhaust port of the first cylinder, the other end of the third exhaust pipe can be communicated with one end of the fourth exhaust pipe, and the other end of the fourth exhaust pipe can be communicated to the first exhaust pipe;

the exhaust pipe is characterized by further comprising a fifth exhaust pipe, one end of the fifth exhaust pipe is communicated to the third exhaust pipe, the other end of the fifth exhaust pipe can be communicated to the second air suction pipe, the fifth exhaust pipe, the third exhaust pipe and the fourth exhaust pipe are communicated together, and a second three-way valve is further arranged at the position where the fifth exhaust pipe, the third exhaust pipe and the fourth exhaust pipe are communicated together;

the third pipeline is communicated with the third pipeline, one end of the third pipeline is communicated with the second air suction pipe, the other end of the third pipeline is communicated with the third pipeline, the fifth exhaust pipe, the sixth pipeline and the third pipeline are communicated together, and a third three-way valve is further arranged at the position where the fifth exhaust pipe, the sixth pipeline and the third pipeline are communicated together.

The present disclosure also provides a method of controlling a refrigerator as in any one of the above, comprising:

the method comprises the following steps of detecting working conditions of the refrigerator, such as the required working volume and/or the refrigerating temperature;

judging whether the working volume of the refrigerator is within a first volume range or a second volume range, wherein the first volume range is larger than the second volume range; and/or judging whether the refrigerating temperature of the refrigerator is lower than a preset temperature or not;

controlling, namely controlling to open the first cylinder and close the second cylinder when the refrigerator is judged to work within the first volume range; when the refrigerator is judged to need to work within the second volume range, controlling to open a second cylinder and close the first cylinder; and/or when the refrigeration temperature of the refrigerator is judged to be less than or equal to the preset temperature, the first air cylinder and the second air cylinder are controlled to be connected in series, and when the refrigeration temperature of the refrigerator is judged to be more than the preset temperature, the first air cylinder and the second air cylinder are controlled not to be connected in series.

In some embodiments, when the first, second, and third three-way valves are included, and further the first and second suction pipes, and the evaporator, the first line, the second line, the third line, and the sixth line are included:

and in the control step, when the refrigerator is judged to need to work within the second volume range, the first three-way valve is controlled to enable the first pipeline to be communicated with the third pipeline and simultaneously enable the first pipeline to be not communicated with the second pipeline, and the third three-way valve is controlled to enable the sixth pipeline to be communicated with the third pipeline, so that the evaporator is communicated with the second air suction pipe, the evaporator is not communicated with the first air suction pipe, the second air cylinder is used for air suction work, and the first air cylinder is not used for air suction work.

In some embodiments, when the first, second, and third three-way valves are included, and further the first and second suction pipes, and the evaporator, the first line, the second line, the third exhaust pipe, and the fourth exhaust pipe are included:

and in the control step, when the refrigerator is judged to need to work within the first volume range, the first three-way valve is controlled to enable the first pipeline to be communicated with the second pipeline and simultaneously enable the first pipeline to be not communicated with the third pipeline, the second three-way valve is controlled to enable the third pipeline to be communicated with the fourth pipeline, the evaporator is enabled to be communicated with the first air suction pipe, the first air cylinder is enabled to work in a suction mode, gas is discharged through the third exhaust pipe, the fourth exhaust pipe and the first exhaust pipe, the evaporator is not communicated with the second air suction pipe, and the second air cylinder is not enabled to work in a suction mode.

In some embodiments, when the first, second, and third three-way valves are included, and the first and second suction pipes, and the evaporator, the first line, the second line, the third exhaust pipe, the fourth exhaust pipe, the fifth exhaust pipe, and the sixth line are further included:

the control step is also used for controlling the first three-way valve to enable the first pipeline to be communicated with the second pipeline and enable the evaporator to be communicated with the first air suction pipe when the refrigeration temperature of the refrigerator is judged to be lower than the preset temperature, the first air cylinder sucks air to work,

while controlling the second three-way valve so that the third exhaust pipe is communicated with the fifth exhaust pipe and the fourth exhaust pipe is disconnected,

and simultaneously controlling the third three-way valve to enable the fifth exhaust pipe to be communicated with the sixth pipeline and the third pipeline to be disconnected, so that the exhaust gas of the first cylinder is communicated with the suction gas of the second cylinder, and the second cylinder also performs suction work.

The compressor, the refrigerator and the control method provided by the disclosure have the following beneficial effects:

1. the refrigerator compressor has the advantages that the two cylinders are arranged, the displacement of the two cylinders is different, the variable displacement compression can be realized, three operation modes can be provided, the compressor can independently operate a small displacement compression mode, a large displacement compression mode or a double-cylinder double-stage compression mode, the requirements of refrigerator systems with different volume ranges on different cold quantities are met, and the single-compressor displacement variable mode is realized; the double-stage compression can be realized, the requirement of a specific refrigerating system for higher operation pressure ratio can be met, and the efficient deep freezing function of the refrigerating system can be realized; the compressor of the present disclosure can provide three modes of operation: single-opening small-displacement compression, single-opening large-displacement compression or simultaneous opening two-stage compression; the matching range is enlarged, the corresponding refrigerating capacity requirement is met, the defect that one compressor can only be suitable for the refrigerator with a specific volume is overcome, and the matching cost is reduced; the requirement of the system on operation with a large pressure ratio can be met, and a compressor implementation mode of a deep freezing refrigerator below 33 ℃ below zero is provided; the low-temperature function can be realized by adjusting the discharge capacity, and the efficiency of the compressor and the efficiency of the refrigerator system are improved;

2. the refrigerator system can be matched with the double-cylinder double-stage compressor to realize the operation mode of independently starting small-displacement compression or independently starting large-displacement compression or simultaneously starting double-cylinder double-stage compression to realize refrigeration;

3. the utility model provides a variable displacement's double-cylinder doublestage piston compressor can furthest adapt to the refrigerator of different volume ranges, satisfies the required cold volume scope of different volume refrigerators, reduces the matching cost. When the refrigerator needs low-load operation, the low-displacement air cylinder can be switched to operate through the three-way valve so as to reduce the cooling capacity of the system, reduce the starting and stopping times of the compressor and improve the energy efficiency of the refrigerator system; when the refrigerator needs high-load operation or fast low temperature, the operation of the large-displacement air cylinder can be switched by the three-way valve so as to improve the cold quantity of the system; for the requirements of large compression ratio and exhaust temperature of deep freezing technology, the compressor can simultaneously run double-stage compression, properly reduce the compression ratio of each stage of compression, adapt to the larger running compression ratio of a refrigeration system, and realize the lower-temperature running of the system.

Drawings

FIG. 1 is a schematic view of the internal structure of a dual cylinder dual stage piston compressor of the present disclosure;

FIG. 2 is a system schematic of a piston compressor matched refrigerator of the present disclosure;

FIG. 3 is a system schematic diagram of a single-open one-stage large displacement compression-matched refrigerator with a piston compressor according to the present disclosure;

FIG. 4 is a system schematic of a single-open two-stage large displacement compression-matched refrigerator of the reciprocating compressor of the present disclosure;

fig. 5 is a system schematic diagram of the piston compressor and the two-stage compression matching refrigerator according to the present disclosure.

The reference numerals are represented as:

11. a first cylinder; 12. a second cylinder; 21. a first piston; 22. a second piston; 31. a first link; 32. a second link; 4. a crankshaft; 51. a first inhalation tube; 52. a second suction duct; 61. a first exhaust pipe; 62. a second exhaust pipe; 63. a third exhaust pipe; 64. a fourth exhaust pipe; 65. a fifth exhaust pipe; 71. a first exhaust muffler; 72. a second exhaust muffler; 81. a first suction muffler; 82. a second suction muffler; 6. a condenser; 7. an evaporator; 8. a throttling device; 91. a first three-way valve; 92. a second three-way valve; 93. a third three-way valve; 101. a first pipeline; 102. a second pipeline; 103. a third pipeline; 104. a fourth pipeline; 105. a fifth pipeline; 106. a sixth pipeline.

Detailed Description

As shown in fig. 1-5, the present disclosure provides a compressor, comprising:

a first cylinder 11 and a second cylinder 12, wherein the displacement of the first cylinder 11 is greater than the displacement of the second cylinder 12, the first cylinder 11 is capable of operating alone, the second cylinder 12 is also capable of operating alone, and the first cylinder 11 and the second cylinder 12 are also capable of communicating in series to form at least two stages of compression.

The refrigerator compressor has the advantages that the two cylinders are arranged, the displacement of the two cylinders is different, the variable displacement compression can be realized, three operation modes can be provided, the compressor can independently operate a small displacement compression mode, a large displacement compression mode or a double-cylinder double-stage compression mode, the requirements of refrigerator systems with different volume ranges on different cold quantities are met, and the single-compressor displacement variable mode is realized; the double-stage compression can be realized, the requirement of a specific refrigerating system for higher operation pressure ratio can be met, and the efficient deep freezing function of the refrigerating system can be realized; the compressor of the present disclosure can provide three modes of operation: single-opening small-displacement compression, single-opening large-displacement compression or simultaneous opening two-stage compression; the matching range is enlarged, the corresponding refrigerating capacity requirement is met, the defect that one compressor can only be suitable for the refrigerator with a specific volume is overcome, and the matching cost is reduced; the requirement of the system on operation with a large pressure ratio can be met, and a compressor implementation mode of a deep freezing refrigerator below 33 ℃ below zero is provided; can realize drawing the low temperature function fast through displacement control, improve compressor efficiency and refrigerator system efficiency.

In some embodiments, the compressor is a piston compressor, comprising a first piston 21 and a second piston 22, the first piston 21 cooperating with the first cylinder 11 and being reciprocally movable in the first cylinder 11, the second piston 22 cooperating with the second cylinder 12 and being reciprocally movable in the second cylinder 12. This is a further preferred form of construction within the compressor of the present disclosure, whereby work can be done in the first cylinder by the first piston to compress the gas into a high pressure gas, and work can be done in the second cylinder by the second piston to compress the gas into a high pressure gas.

In some embodiments, the engine further comprises a first connecting rod 31, a second connecting rod 32, and a crankshaft 4, wherein the first connecting rod 31 is connected to the first piston 21 at one end and the crankshaft 4 at the other end, and the second connecting rod 32 is connected to the second piston 22 at one end and the crankshaft 4 at the other end. This is the inside further preferred structural style of compressor of this disclosure, can be connected with the bent axle through first connecting rod in order to be driven by the bent axle and produce reciprocating motion, and the other end is connected first piston in order to promote first piston and do reciprocating motion, can be connected with the bent axle through the second connecting rod in order to be driven by the bent axle and produce reciprocating motion by one end, and the other end is connected the second piston in order to promote the second piston and do reciprocating motion.

In some embodiments, the first connecting rod 31 is sleeved on the crankshaft 4, and the second connecting rod 32 is also sleeved on the crankshaft 4; and/or, the first connecting rod 31 and the second connecting rod 32 are arranged in a staggered manner along the axial direction of the crankshaft 4. This is a further preferred form of construction of the present disclosure, by sharing a single crankshaft for both connecting rods, so that both connecting rods and the piston can be driven in motion by a single crankshaft at the same time.

In some embodiments, the air inlet of the first cylinder 11 can be communicated with a first air inlet pipe 51, and the air outlet of the first cylinder 11 can be communicated with a first air outlet pipe 61; the intake port of the second cylinder 12 can be communicated with a second intake pipe 52, and the exhaust port of the second cylinder 12 can be communicated with a second exhaust pipe 62. The intake air can be introduced into the first cylinder through the first intake pipe, the exhaust gas of the first cylinder can be led out through the first exhaust pipe, the intake air can be introduced into the second cylinder through the second intake pipe, and the exhaust gas of the second cylinder can be led out through the second exhaust pipe.

In some embodiments, a first exhaust muffler 71 is also disposed in communication between the exhaust port of the first cylinder 11 and the first exhaust pipe 61; a second exhaust muffler 72 is also disposed in communication between the exhaust port of the second cylinder 12 and the second exhaust pipe 62; and/or the presence of a gas in the gas,

a first suction muffler 81 is also provided in communication between the suction port of the first cylinder 11 and the first suction pipe 51; a second suction muffler 82 is also disposed in communication between the suction port of the second cylinder 12 and the second suction pipe 52.

Referring to fig. 1, the double-cylinder two-stage piston compressor structure of the present invention has a compressor housing with a first and a second suction pipe, a first and a second exhaust pipe. The compressor pump body structure sets up the cylinder that the two-stage discharge capacity is different, and first big discharge capacity cylinder (being first cylinder, lower with), second small discharge capacity cylinder (being second grade cylinder, lower with) are 180 opposition, including but not limited to the level place or misplace from top to bottom. The corresponding first cylinder is provided with a first piston, a first connecting rod, a first-stage air suction silencer and other air valve assemblies. And the secondary cylinder is provided with a second piston, a second connecting rod, a secondary air suction silencer and other air valve assemblies. The first-stage compression and the second-stage compression share the crankshaft and the motor, and the first connecting rod and the second connecting rod are arranged on the crank in a nesting mode, a vertical dislocation mode and the like. The compressor is externally provided with a three-way valve, and the switching of single-stage large-displacement compression, single-stage small-displacement compression or double-cylinder double-stage compression modes can be realized by controlling the flow path of the three-way valve.

The first piston is mounted in the first cylinder and the second piston is mounted in the second cylinder. The first piston is connected with the crankshaft through a first connecting rod, and the second piston is connected with the crankshaft through a second connecting rod; the two-stage connecting rods share a crankshaft and are assembled and operated in a nested mode. The motor drives the crankshaft to rotate, the two pistons are driven to reciprocate in the cylinder through the crank connecting rod structure, and the air suction, compression and exhaust of the compressor are controlled through the valve bank assembly. The three-way valve is used for controlling the structural design of the gas path, so that the switching of three different compression modes is realized.

The present disclosure also enables silencing of exhaust gas of the first cylinder by the first exhaust silencer and silencing of exhaust gas of the second cylinder by the second exhaust silencer; the first air suction muffler can be used for silencing air sucked by the first cylinder, and the second air suction muffler can be used for silencing air sucked by the second cylinder.

The present disclosure also provides a refrigerator including the compressor of any one of the foregoing.

FIG. 2 is a system diagram of the refrigerator matched with the double-cylinder double-stage compressor, which comprises a condenser, a throttling device, a freezing evaporator and 3 three-way valves besides the compressor. Specific flow paths of the refrigerant in the compressor in different operation modes are described with reference to fig. 3, 4 and 5.

The variable-displacement double-cylinder double-stage piston compressor provided by the invention has the advantages that the volume range span of a refrigerator capable of being matched is increased, and the difficult problem of deep freezing technology of the refrigerator can be solved by operating double-stage compression. The compressor control structure is simple, single-stage compression of different discharge capacities can be realized through switching of the three-way valve, the variable discharge capacity function is realized, double-cylinder double-stage compression can also be realized, the requirement of a system high pressure ratio is met, and the deep freezing function is realized. The invention has the main structural points that: the single-machine double-cylinder double-stage compressor has the advantages of variable discharge capacity, switching between large-discharge single-stage compression and small-discharge single-stage compression, and direct suction of two stages, can meet the requirement of a refrigeration system on large pressure ratio, and realizes the function of deep freezing at-33 ℃ of the refrigerator.

In some embodiments, when including the first and second aspiration conduits 51, 52:

the condenser comprises a condenser 6, an evaporator 7, a throttling device 8, a first pipeline 101, a second pipeline 102 and a third pipeline 103, wherein one end of the condenser 6 is communicated with one end of the throttling device 8, the other end of the throttling device 8 is communicated with one end of the evaporator 7, the other end of the evaporator 7 is communicated with the first pipeline 101, one end of the second pipeline 102 is communicated with the first air suction pipe 51, the other end of the second pipeline is communicated with the first pipeline 101, one end of the third pipeline 103 is communicated with the second air suction pipe 52, the other end of the third pipeline is communicated with the first pipeline 101, and a first three-way valve 91 is arranged at a position where the first pipeline 101, the second pipeline 102 and the third pipeline 103 jointly meet.

The refrigerator system can conduct the refrigerant coming out of the evaporator in a controllable mode through the first pipeline, the second pipeline, the third pipeline and the first three-way valve, and control the refrigerant to enter the first air cylinder through the second pipeline or enter the second air cylinder through the third pipeline to achieve the control effect of air suction.

In some embodiments, when the first exhaust pipe 61 and the second exhaust pipe 62 are included:

still include fourth pipeline 104 and fifth pipeline 105, the one end of fourth pipeline 104 with first blast pipe 61 intercommunication, the other end with condenser 6 intercommunication, the one end of fifth pipeline 105 with second blast pipe 62 intercommunication, the other end also with condenser 6 intercommunication. This disclosure still can derive the exhaust of first cylinder through the fourth pipeline to lead to and carry out the condensation in the condenser and release heat, still can derive the exhaust of second cylinder through the fifth pipeline, and lead to and carry out the condensation in the condenser and release heat.

In some embodiments, when the first exhaust pipe 61 and the second exhaust pipe 62 are included:

a third exhaust pipe 63 and a fourth exhaust pipe 64, the third exhaust pipe 63 having one end communicable to the exhaust port of the first cylinder 11 and the other end communicable with one end of the fourth exhaust pipe 64, the fourth exhaust pipe 64 having the other end communicable to the first exhaust pipe 61;

the exhaust pipe system further comprises a fifth exhaust pipe 65, one end of the fifth exhaust pipe 65 is communicated with the third exhaust pipe 63, the other end of the fifth exhaust pipe 65 can be communicated with the second air suction pipe 52, the fifth exhaust pipe 65, the third exhaust pipe 63 and the fourth exhaust pipe 64 are communicated together, and a second three-way valve 92 is further arranged at the position where the fifth exhaust pipe 65, the third exhaust pipe 63 and the fourth exhaust pipe 64 are communicated together;

the third exhaust pipe 65, the sixth pipeline 106 and the third pipeline 103 are communicated with each other, and a third three-way valve 93 is further disposed at a position where the third pipeline 103 is communicated with the fifth exhaust pipe 106.

The refrigerator system can lead out the exhaust of the first cylinder through the third exhaust pipe, can selectively control the fourth exhaust pipe and the fifth exhaust pipe to directly exhaust through the first exhaust pipe through the fourth pipeline through the fourth exhaust pipe and the fifth exhaust pipe which are respectively communicated with the second three-way valve, or controls the fifth exhaust pipe, the third three-way valve and the sixth pipeline to enter the second cylinder, and double-stage compression is generated and is suitable for the condition of lower temperature working condition needing refrigeration.

The refrigerator system can be matched with the double-cylinder double-stage compressor to realize the operation mode of independently starting small-displacement compression or independently starting large-displacement compression or simultaneously starting double-cylinder double-stage compression to realize refrigeration; the variable-displacement double-cylinder double-stage piston compressor provided by the invention has the advantages that the volume range span of a refrigerator capable of being matched is increased, and the difficult problem of deep freezing technology of the refrigerator can be solved by operating double-stage compression. The compressor control structure is simple, single-stage compression of different discharge capacities can be realized through switching of the three-way valve, the variable discharge capacity function is realized, double-cylinder double-stage compression can also be realized, the requirement of a system high pressure ratio is met, and the deep freezing function is realized. The invention has the main structural points that: the single-machine double-cylinder double-stage compressor has the advantages of variable discharge capacity, switching between large-discharge single-stage compression and small-discharge single-stage compression, and direct suction of two stages, can meet the requirement of a refrigeration system on large pressure ratio, and realizes the function of deep freezing at-33 ℃ of the refrigerator.

The utility model provides a variable displacement's double-cylinder doublestage piston compressor can furthest adapt to the refrigerator of different volume ranges, satisfies the required cold volume scope of different volume refrigerators, reduces the matching cost. When the refrigerator needs low-load operation, the low-displacement air cylinder can be switched to operate through the three-way valve so as to reduce the cooling capacity of the system, reduce the starting and stopping times of the compressor and improve the energy efficiency of the refrigerator system; when the refrigerator needs high-load operation or fast low temperature, the operation of the large-displacement air cylinder can be switched by the three-way valve so as to improve the cold quantity of the system; for the requirements of large compression ratio and exhaust temperature of deep freezing technology, the compressor can simultaneously run double-stage compression, properly reduce the compression ratio of each stage of compression, adapt to the larger running compression ratio of a refrigeration system, and realize the lower-temperature running of the system.

The present disclosure also provides a method of controlling a refrigerator as in any one of the above, comprising:

the method comprises the following steps of detecting working conditions of the refrigerator, such as the required working volume and/or the refrigerating temperature;

judging whether the working volume of the refrigerator is within a first volume range or a second volume range, wherein the first volume range is larger than the second volume range; and/or judging whether the refrigerating temperature of the refrigerator is lower than a preset temperature or not;

controlling, namely controlling to open the first cylinder and close the second cylinder when the refrigerator is judged to work within the first volume range; when the refrigerator is judged to need to work within the second volume range, controlling to open a second cylinder and close the first cylinder; and/or when the refrigeration temperature of the refrigerator is judged to be less than or equal to the preset temperature, the first air cylinder and the second air cylinder are controlled to be connected in series, and when the refrigeration temperature of the refrigerator is judged to be more than the preset temperature, the first air cylinder and the second air cylinder are controlled not to be connected in series.

The control method can control the large displacement cylinder or the small displacement cylinder in different displacements to work according to the requirements of different volume working conditions of the refrigerator, can meet the requirements of refrigerator systems in different volume ranges on different cooling capacities, and realizes a displacement variable mode of a single compressor; whether the refrigerator adopts double-stage compression work or not can be selectively controlled according to the requirement of the refrigeration temperature working condition of the refrigerator, the requirement of a specific refrigeration system for larger operation pressure ratio can be met, the efficient deep freezing function of the refrigeration system can be realized, and a compressor implementation mode of the deep freezing refrigerator below 33 ℃ below zero can be provided; the low-temperature function can be realized by adjusting the discharge capacity, and the efficiency of the compressor and the efficiency of the refrigerator system are improved;

in some embodiments, the determining step is further configured to determine whether the volume of the refrigerator is within a third volume range, wherein the third volume range is larger than the first volume range;

and in the control step, when the refrigerator is judged to need to work in the third volume range, the first air cylinder is controlled to be opened, and the second air cylinder is controlled to be opened at the same time.

This is disclosed can also control two cylinders work simultaneously through above-mentioned means to the work operation under the demand of realization maximum volume operating mode provides the compression exhaust and the refrigeration of bigger volume operating mode.

In some embodiments, when the first, second, and third three-way valves 91, 92, and 93 are included, and the first and second suction pipes 51 and 52, and the evaporator 7, the first line, the second line, the third line, the first exhaust pipe, the third exhaust pipe, and the fourth exhaust pipe are also included:

and in the control step, when it is determined that the refrigerator needs to operate within the first volume range, the first three-way valve 91 is controlled to enable the first pipeline 101 to be communicated with the second pipeline 102, the first pipeline 101 to be not communicated with the third pipeline 103, the second three-way valve 92 to enable the third exhaust pipe to be communicated with the fourth exhaust pipe, the evaporator 7 is enabled to be communicated with the first air suction pipe 51, the first air cylinder 11 performs air suction operation, and discharges air through the third exhaust pipe, the fourth exhaust pipe and the first exhaust pipe, the evaporator 7 is not communicated with the second air suction pipe 52, and the second air cylinder 12 does not perform air suction operation.

As shown in fig. 3, when a small-volume refrigerator needs to be rapidly cooled or a large-volume refrigerator normally operates (i.e., when the refrigerator is loaded more), the refrigerator is single-opened and single-stage and large-displacement compressed, a high-temperature and high-pressure refrigerant coming out of a condenser enters a refrigeration evaporator after being throttled, a low-temperature and low-pressure refrigerant evaporated in the refrigeration evaporator enters a first-stage and large-displacement cylinder from a first air suction pipe of a compressor after passing through a first three-way valve 91 to be compressed, and a compressed gas passes through a first exhaust silencer and a second three-way valve 92 and then is discharged out of the compressor through the first exhaust pipe and enters the condenser, so that a.

The refrigerator disclosed by the invention needs to work in the preferred control mode under the working condition of the first volume range, the second cylinder does not suck air and does not work, only the first cylinder is allowed to suck air and work, effective exhaust control is carried out, and the connection control of the working condition of the large volume of the single cylinder is realized.

In some embodiments, when the first, second, and third three-way valves are included, and the first and second suction pipes 51 and 52, and the evaporator 7, the first line, the second line, the third line, the second exhaust pipe, and the sixth line are further included:

and in the controlling step, when it is determined that the refrigerator needs to operate within the second volume range, the first three-way valve 91 is controlled to enable the first pipeline 101 to be communicated with the third pipeline 103, simultaneously enable the first pipeline 101 to be not communicated with the second pipeline 102, and simultaneously control the third three-way valve 93 to enable the sixth pipeline 106 to be communicated with the third pipeline 103, so that the evaporator 7 is communicated with the second air suction pipe 52, the second air cylinder 12 performs air suction operation and discharges air through the second air discharge pipe, the evaporator 7 is not communicated with the first air suction pipe 51, and the first air cylinder 11 does not perform air suction operation.

As shown in fig. 4, when the small-volume refrigerator operates normally or the large-volume refrigerator operates stably (i.e., the refrigerator has a small load), the single-open two-stage small-displacement compressor compresses the high-temperature and high-pressure refrigerant flowing out of the condenser and entering the refrigeration evaporator after throttling, the low-temperature and low-pressure refrigerant evaporated in the refrigeration evaporator enters the two-stage small-displacement cylinder from the second air suction pipe of the compressor after passing through the first three-way valve 91 and the third three-way valve 93 and is compressed, and the compressed air passes through the second exhaust muffler and then is discharged out of the compressor through the second exhaust pipe and enters the condenser, thereby realizing the refrigeration cycle.

The refrigerator needs to work in the second volume range working condition, the first air cylinder does not suck air and does not work, the second air cylinder is allowed to suck air and work, effective exhaust control is performed, and connection control of the single air cylinder in the smaller volume working condition is achieved.

In some embodiments, when the first, second, and third three-way valves 91, 92, and 93 are included, and the first and second suction pipes 51 and 52, and the evaporator 7, the first line, the second line, the third exhaust pipe, the fourth exhaust pipe, the fifth exhaust pipe, and the sixth line are also included:

the controlling step is further configured to, when it is determined that the refrigerating temperature of the refrigerator is less than a preset temperature, control the first three-way valve 91 to communicate the first pipeline 101 with the second pipeline 102 and communicate the evaporator 7 with the first air suction pipe 51, so that the first air cylinder 11 operates for air suction,

while controlling the second three-way valve 92 such that the third exhaust pipe 63 is communicated with the fifth exhaust pipe 65 and the fourth exhaust pipe 64 is cut off,

at the same time, the third three-way valve 93 is controlled so that the fifth exhaust pipe 65 communicates with the sixth pipe 106 and the third pipe 103 is disconnected, so that the exhaust gas of the first cylinder 11 communicates with the intake air of the second cylinder 12, and the second cylinder 12 also operates with the intake air.

The refrigerator needs to work in a preferred control mode under a lower-temperature working condition, the first air cylinder can be enabled to suck air and the second air cylinder can suck air to work, exhaust of the first air cylinder is controlled to enter the second air cylinder to suck air, double-stage compression is formed, the pressure ratio is improved, effective exhaust control is conducted, and connection control from double-stage compression of the double air cylinders to the lower-temperature working condition is achieved.

As shown in fig. 5, when the refrigerator needs to realize a deep freezing function below-33 ℃, double-cylinder two-stage compression needs to be switched at this time, a high-temperature high-pressure refrigerant coming out of a condenser enters a freezing evaporator after throttling, a low-temperature low-pressure refrigerant evaporated in the freezing evaporator enters a first-stage large-displacement cylinder from a first air suction pipe of a compressor after passing through a first three-way valve 91 for first-stage compression, a compressed gas enters a second-stage small-displacement cylinder from a second air suction pipe of the compressor after passing through a first exhaust silencer, a second three-way valve 92 and a third three-way valve 93 for second-stage compression, and the gas after two-stage compression is discharged from the compressor through a second exhaust pipe after passing through a second exhaust silencer and enters the condenser, so as to.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.