CN117145725A - Direct current linear compressor - Google Patents
Direct current linear compressor Download PDFInfo
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- CN117145725A CN117145725A CN202311277471.2A CN202311277471A CN117145725A CN 117145725 A CN117145725 A CN 117145725A CN 202311277471 A CN202311277471 A CN 202311277471A CN 117145725 A CN117145725 A CN 117145725A
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- pressure cavity
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- 238000007906 compression Methods 0.000 claims abstract description 55
- 230000006835 compression Effects 0.000 claims abstract description 50
- 230000033001 locomotion Effects 0.000 claims abstract description 8
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 239000003507 refrigerant Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 235000014676 Phragmites communis Nutrition 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B25/00—Multi-stage pumps
- F04B25/005—Multi-stage pumps with two cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/04—Motor parameters of linear electric motors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention discloses a direct current linear compressor, which belongs to the technical field of compressors and comprises two linear motors which are coaxially arranged and piston bodies which are connected with movers of the linear motors, wherein different piston bodies move in opposite directions or back to back directions along the axial direction, each piston body comprises one or two piston heads, each piston head is arranged in a cylinder body, one side or two sides of each piston head form a compression cavity, each compression cavity comprises a high-pressure cavity and a low-pressure cavity, the high-pressure cavities and the low-pressure cavities are respectively positioned in two directions of the reciprocating movement of each piston head, each low-pressure cavity is connected with a low-pressure air inlet valve and a low-pressure air outlet valve, each high-pressure cavity is connected with a high-pressure air inlet valve and a high-pressure air outlet valve, and a connecting pipeline is arranged between each low-pressure air outlet valve and each high-pressure air inlet valve. According to the invention, the piston body is connected with the mover of the linear motor to form the high-pressure cavity and the low-pressure cavity which are axially distributed, when secondary compression is carried out, the piston body reciprocates to be in a symmetrical state, and bidirectional vibration impact can be mutually offset, so that the stability of the compression process is improved on the basis of ensuring a larger compression ratio.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a direct-current linear compressor.
Background
In the field of aerospace technology, a stable deep low-temperature environment is a reliable guarantee of a space detector, and a Joule-Thomson (JT) low-temperature refrigerator driven by a direct-current linear compressor is widely applied due to a compact structure and high refrigeration efficiency. The direct current linear compressor is driven by a linear motor, a crank-link mechanism is omitted by reciprocating motion of a piston, friction loss is reduced, and mechanical efficiency is improved, for example, a direct current linear compressor is disclosed in Chinese patent with the publication number of CN 112901442B. The piston provides radial support by virtue of the plate spring, so that micron-sized interstage seal is formed between the piston and the cylinder wall, oil-free lubrication is realized, and the direct-current linear compressor can operate efficiently and stably. Through the opening and closing action of the valve plate, the working medium realizes unidirectional flow, provides a certain pressure ratio and meets the high and low pressure requirements of JT throttling refrigeration.
In general, single stage dc linear compressors can only provide a 3 to 4 pressure ratio, with a certain limit on the temperature achievable by JT throttling refrigerators. Therefore, a two-stage or multi-stage serial compression mode is needed to form a large pressure ratio, and better refrigeration performance is obtained under the condition of meeting the flow requirement.
Compression schemes with two-stage arrangement are disclosed in the prior patent literature, for example, chinese patent publication No. CN 101684799A discloses a two-stage rotary compressor comprising a closed vessel; a rotation shaft positioned inside the closed container and transmitting a rotation force; a low pressure compression assembly for compressing the 1 st refrigerant inside the low pressure cylinder when the rotation shaft rotates; when the rotation axis rotates, the high pressure cylinder compresses the 2 nd refrigerant inside the high pressure compression assembly; an intermediate plate dividing the low-pressure cylinder and the high-pressure cylinder; an intermediate pressure chamber communicating with the low pressure compression assembly and the high pressure compression assembly, a bearing formed in the middle, and a cover; and long bolts for assembling the low-pressure cylinder, the high-pressure cylinder, the middle plate, the bearing and the cover on the same shaft. The scheme adopts a rotary compression scheme, the compression capacity is lower, and a larger compression ratio cannot be achieved.
For another example, chinese patent with the publication number CN 217300803U discloses a secondary air compression device, in which an air inlet with a valve flap is provided on a base, so that the air inlet flows unidirectionally to a low-pressure rodless cavity; a high-pressure one-way valve from the high-pressure cavity to the outlet is arranged in the outlet positioned on the side surface of the base; the inside transmission tube that sets up of base, the transmission tube is that the low pressure has the pole chamber to be connected to the high pressure rodless chamber through the pipeline that is provided with the valve block structure, this valve block structure restriction high pressure rodless chamber has the air current in pole chamber to the low pressure, the valve body upper end of high pressure check valve sets up to the plane, valve body side and upper surface edge position are provided with the transmission hole of intercommunication, the transmission tube is connected to the one end of transmission hole in valve body side, valve body up end and valve block contact, the valve block is the ring form, the hole in valve block center is used for the air current to reach high pressure check valve, the transmission hole of valve block cover valve body up end, there is the clearance between terminal surface and the valve body up end under the high pressure cavity, the valve block is movable in the clearance. According to the scheme, the low-pressure piston is connected with the low-pressure piston rod, the high-pressure piston is connected with the high-pressure piston rod, the low-pressure piston rod and the high-pressure piston rod penetrate through the upper cover and are connected together, and the low-pressure piston rod and the high-pressure piston rod are connected with the reciprocating mechanism together.
Therefore, how to ensure a larger compression ratio, ensure the refrigerating performance, and also ensure the stability of the compression process is a technical problem faced in the art.
Disclosure of Invention
The invention aims to provide a direct current linear compressor, which solves the problems in the prior art, and the piston body is connected with a rotor of the linear motor through coaxially arranging two linear motors to form a high-pressure cavity and a low-pressure cavity which are axially distributed.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a direct-current linear compressor, which comprises two linear motors and piston bodies, wherein the two linear motors are coaxially arranged, the piston bodies are connected with movers of the linear motors, different piston bodies move in opposite directions or opposite directions along the axial direction, each piston body comprises one or two piston heads, each piston head is arranged in a cylinder body, one side or two sides of each piston head form a compression cavity, each compression cavity comprises a high-pressure cavity and a low-pressure cavity, the high-pressure cavities and the low-pressure cavities are respectively positioned in two directions of reciprocating movement of the piston heads, each low-pressure cavity is connected with a low-pressure air inlet valve and a low-pressure air outlet valve, a connecting pipeline is arranged between each high-pressure air inlet valve and each low-pressure air outlet valve, when the low-pressure cavity is compressed, each high-pressure cavity is expanded, when the low-pressure cavity is expanded, a working medium is compressed through the low-pressure cavities and then enters the high-pressure cavities through the connecting pipelines to be compressed again to complete compression.
Preferably, the cylinder block comprises a high-pressure cylinder block with a high-pressure cavity and a low-pressure cylinder block with a low-pressure cavity, the piston body comprises a piston connecting rod and piston heads connected to two ends of the piston connecting rod, the piston heads positioned on the inner sides of the two linear motors are arranged in the same cylinder body, and the piston heads positioned on the outer sides of the two linear motors are respectively arranged in separate cylinder bodies.
Preferably, the low-pressure cylinder block is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the air inlet, and the low-pressure air outlet valve communicated with the low-pressure cavity and the high-pressure cavity; the high-pressure cylinder body is provided with the high-pressure exhaust valve communicated with the high-pressure cavity and the air outlet, and the high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity; the piston head is provided with a deviation adjusting hole, the deviation adjusting hole comprises an annular groove arranged on the inner wall of the cylinder body and a vent hole arranged on the piston head and communicated with the back pressure cavity and the compression cavity respectively, and different vent holes can be communicated at the annular groove.
Preferably, the piston heads positioned at the inner sides of the two linear motors are low-pressure piston heads, the low-pressure piston heads are arranged in the low-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are high-pressure piston heads, and the high-pressure piston heads are arranged in the high-pressure cylinder body.
Preferably, the piston heads positioned at the inner sides of the two linear motors are high-pressure piston heads, the high-pressure piston heads are arranged in the high-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are low-pressure piston heads, and the low-pressure piston heads are arranged in the low-pressure cylinder body.
Preferably, the piston heads positioned at the inner sides of the two linear motors are low-pressure piston heads, the low-pressure piston heads are arranged in the low-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are high-pressure piston heads, and the high-pressure piston heads are arranged in the high-pressure cylinder body; the low-pressure piston head is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the back pressure cavity thereof, and the low-pressure cylinder body is provided with the low-pressure exhaust valve communicated with the low-pressure cavity and the high-pressure cavity.
Preferably, the piston heads positioned at the inner sides of the two linear motors are high-pressure piston heads, the high-pressure piston heads are arranged in the high-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are low-pressure piston heads, and the low-pressure piston heads are arranged in the low-pressure cylinder body; the high-pressure piston head is provided with a high-pressure exhaust valve communicated with the high-pressure cavity and the back pressure cavity thereof, and the high-pressure cylinder body is provided with a high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity.
Preferably, the piston body comprises a piston connecting rod and a piston head connected to the end of the piston connecting rod, which is close to one end of the piston connecting rod, wherein the two piston heads are arranged in the same cylinder body, and the piston head divides the cylinder body into the high-pressure cavity and the low-pressure cavity.
Preferably, the cavities at the inner sides of the two piston bodies are the low-pressure cavities, the cavities at the outer sides of the two piston bodies are the high-pressure cavities, and the cylinder body is provided with the low-pressure air inlet valve communicated with the low-pressure cavities and the air inlet and the low-pressure air outlet valve communicated with the low-pressure cavities and the high-pressure cavities; the cylinder body is provided with the high-pressure exhaust valve communicated with the high-pressure cavity and the air outlet, and the high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity.
Preferably, the cavities inside the two piston bodies are the high-pressure cavities, the cavities outside the two piston bodies are the low-pressure cavities, and the cylinder body is provided with the high-pressure exhaust valve communicated with the high-pressure cavities and the exhaust ports and the high-pressure air inlet valve communicated with the high-pressure cavities and the low-pressure cavities; the cylinder body is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the air inlet, and the low-pressure exhaust valve communicated with the low-pressure cavity and the high-pressure cavity.
Compared with the prior art, the invention has the following technical effects:
(1) According to the invention, the piston body is connected with the rotor of the linear motor through the coaxial arrangement of the two linear motors to form the high-pressure cavity and the low-pressure cavity which are axially distributed, and the single compressor is adopted to realize the function of two-stage compression, so that the output performance is better, the structure is more compact, when two-stage compression is carried out, the piston body reciprocates to be in a symmetrical state, the double-piston opposite structure is adopted to carry out reciprocating motion, the bidirectional vibration impact can offset each other, the mechanical vibration of the compressor is reduced, and the stability of the compression process is improved on the basis of ensuring a larger compression ratio;
(2) The piston heads positioned at the inner sides of the two linear motors are arranged in the same cylinder body, and the piston heads positioned at the outer sides of the two linear motors are respectively arranged in the independent cylinder bodies to form a three-cylinder two-stage structure, so that two-stage compression can be realized by replacing two single-stage linear compressors, the overall weight of a pipeline arrangement and a refrigerator is reduced, the structure is more compact, the light weight of a direct-current linear compressor with a large pressure ratio is realized, and the use of a space liquid helium temperature zone throttling refrigerator is met;
(3) The piston body comprises the piston connecting rod and the piston heads connected to the end parts of the piston connecting rod, which are close to one end of the piston connecting rod, wherein the two piston heads are arranged in the same cylinder body, and the piston heads divide the cylinder body into a high-pressure cavity and a low-pressure cavity;
(4) According to the invention, when the low-pressure piston head is positioned at the inner sides of the two linear motors, the low-pressure piston head is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the back pressure cavity thereof, and when the high-pressure piston head is positioned at the inner sides of the two linear motors, the high-pressure piston head is provided with the high-pressure air outlet valve communicated with the high-pressure cavity and the back pressure cavity thereof, that is, air can be introduced or discharged through the low-pressure piston head or the high-pressure piston head, compared with a mode of directly introducing air or discharging air through a cylinder body, the clearance volume can be reduced, and better performance is achieved;
(5) According to the invention, the offset adjusting hole is formed in the piston head, the offset adjusting hole comprises the annular groove formed in the inner wall of the cylinder body and the vent holes formed in the piston head and respectively communicated with the back pressure cavity and the compression cavity, when the piston head reciprocates to the annular groove, the cavities at two sides of the piston head are communicated through the vent holes, so that unbalanced average pressure can be balanced, and the situation that the piston head deviates to one side is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the basic structure of the present invention;
FIG. 2 is a schematic diagram of the air inlet structure of the back pressure chamber of the present invention;
FIG. 3 is a schematic view of the back pressure chamber of the present invention;
FIG. 4 is a schematic diagram of a reverse compression structure of the base structure of the present invention;
FIG. 5 is a schematic diagram of the back pressure chamber exhaust structure of the present invention;
FIG. 6 is a schematic view of the back pressure chamber of the present invention;
1, a low-pressure cylinder block; 11. a low pressure chamber; 12. a low pressure intake valve; 13. a low pressure vent valve; 2. a high-pressure cylinder block; 21. a high pressure chamber; 22. a high pressure intake valve; 23. a high pressure exhaust valve; 3. a piston body; 31. a low pressure piston head; 32. a high pressure piston head; 33. a piston connecting rod; 4. a linear motor; 5. a plate spring; 6. a connecting pipeline; 7. a back pressure chamber; 8. and a deviation adjusting hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a direct current linear compressor, which solves the problems in the prior art, and a piston body is connected with a rotor of a linear motor through coaxially arranging two linear motors to form a high-pressure cavity and a low-pressure cavity which are axially distributed.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 6, the present invention provides a direct current linear compressor, which comprises two linear motors 4 coaxially arranged, wherein the linear motors 4 can adopt moving coil type, moving magnetic type and moving iron type linear motors 4. The linear motor 4 comprises a stator and a rotor, wherein the rotor can do reciprocating linear motion relative to the stator, the piston body 3 is connected with the rotor of the linear motor 4, and the piston bodies 3 connected with the rotors of different linear motors 4 move oppositely or back to back along the axial direction. The piston body 3 includes one or two piston heads mounted in the cylinder body, one or both sides of which form a compression chamber, which is divided into a low pressure chamber 11 and a high pressure chamber 21 according to whether primary compression or secondary compression is performed. The low-pressure cavity 11 can be embedded with a hard inner sleeve on the inner wall and is sprayed with wear-resistant materials to realize high-efficiency wear resistance; the high-pressure cavity 21 can be embedded with a hard inner sleeve on the inner wall and sprayed with wear-resistant materials to realize high-efficiency wear resistance. When one side of the piston head forms a compression chamber, it is referred to as a low pressure chamber 11 if used for primary compression, the piston head is a low pressure piston head 31, and it is referred to as a high pressure chamber 21 if used for secondary compression, the piston head is a high pressure piston head 32; when the compression chambers are formed on both sides of the piston head, the high pressure chamber 21 and the low pressure chamber 11 are formed on both sides, respectively, then the piston head can be seen as a low pressure piston head 31 when compressed in the direction of the low pressure chamber 11, and as a high pressure piston head 32 when compressed in the direction of the high pressure chamber 21. The low-pressure piston head 31 can improve the reciprocating wear resistance of the piston by adopting a mode of bonding a wear-resistant lining on the outer wall and spraying wear-resistant materials; the high pressure piston head 32 may have an outer wall bonded with wear resistant bushings and sprayed with wear resistant material to enhance the piston's reciprocating wear resistance. The high pressure chamber 21 and the low pressure chamber 11 are respectively positioned in two directions of the reciprocating movement of the piston head, when the piston head moves in opposite directions, the low pressure chamber 11 (the high pressure chamber 21) is compressed, and when the piston head moves in opposite directions, the high pressure chamber 21 (the low pressure chamber 11) is compressed, so that a symmetrical movement structure is formed. As the piston head reciprocates, the low pressure chamber 11 completes the suction-compression-discharge-expansion process, and the high pressure chamber 21 completes the discharge-expansion-suction-compression process.
The low-pressure chamber 11 is connected with a low-pressure air inlet valve 12 and a low-pressure air outlet valve 13, and the high-pressure chamber 21 is connected with a high-pressure air inlet valve 22 and a high-pressure air outlet valve 23. The low-pressure air inlet valve 12 can be a flat valve, a reed valve, an annular valve, a net valve, a butterfly valve and the like; the low-pressure exhaust valve 13 can be a flat valve, a reed valve, an annular valve, a net valve, a butterfly valve and the like; the high-pressure air intake valve 22 can be a flat valve, a reed valve, an annular valve, a net valve, a butterfly valve, etc.; the high-pressure exhaust valve 23 may be a flat valve, reed valve, annular valve, mesh valve, or butterfly valve. A connecting pipeline 6 is arranged between the low-pressure exhaust valve 13 and the high-pressure air inlet valve 22, when the low-pressure cavity 11 is compressed, the high-pressure cavity 21 is expanded, when the low-pressure cavity 11 is expanded, the high-pressure cavity 21 is compressed, and working medium enters the high-pressure cavity 21 through the connecting pipeline 6 after being compressed in the low-pressure cavity 11, and the two-stage compression is completed. According to the invention, the piston body 3 is connected with the rotor of the linear motor 4 through the coaxial arrangement of the two linear motors 4 to form the high-pressure cavity 21 and the low-pressure cavity 11 which are axially distributed, when secondary compression is carried out, the piston body 3 reciprocates to be in a symmetrical state, and bidirectional vibration impact can be mutually offset, so that the stability of the compression process can be improved on the basis that the secondary compression ensures a larger compression ratio.
As shown in fig. 1, 2, 4 and 5, the cylinder block includes a high-pressure cylinder body 2 having a high-pressure chamber 21 and a low-pressure cylinder body 1 having a low-pressure chamber 11, and the piston body 3 includes a piston connecting rod 33 and piston heads connected to both ends of the piston connecting rod 33, the piston heads being connected to the piston connecting rod 33 by screw threads, welding, or the like. The piston connecting rod 33 is provided with a plate spring 5, the plate spring 5 is sleeved on the piston connecting rod 33, the central position is fixed through a pressing block, and the periphery is fixedly connected with the cylinder body through a screw. The leaf spring 5 may be of archimedes spiral type, circular involute type, eccentric circular involute type, or the like. The piston heads positioned on the inner sides of the two linear motors 4 are arranged in the same cylinder body, and the piston heads positioned on the outer sides of the two linear motors 4 are respectively arranged in separate cylinder bodies. Depending on whether the primary compression or the secondary compression, the low-pressure cylinder block 1 may be provided in the middle and the high-pressure cylinder block 2 may be provided at both ends, or the high-pressure cylinder block 2 may be provided in the middle and the low-pressure cylinder block 1 may be provided at both ends. In either mode, the three-cylinder two-stage structure can be formed, two-stage compression can be realized by replacing two single-stage linear compressors, the whole weight of the pipeline arrangement and the refrigerator is reduced, and the structure is more compact.
As shown in fig. 1 and 4, the low-pressure cylinder block 1 is provided with a low-pressure intake valve 12 that communicates with the low-pressure chamber 11 and the intake port, and the low-pressure cylinder block 1 is also provided with a low-pressure exhaust valve 13 that communicates with the low-pressure chamber 11 and the high-pressure chamber 21. The high-pressure cylinder body 2 is provided with a high-pressure exhaust valve 23 which is communicated with the high-pressure cavity 21 and the air outlet, and the high-pressure cylinder body 2 is also provided with a high-pressure air inlet valve 22 which is communicated with the high-pressure cavity 21 and the low-pressure cavity 11. Each piston head can be provided with a deviation adjusting hole 8, each deviation adjusting hole 8 comprises an annular groove arranged on the inner wall of the cylinder body and vent holes arranged on the piston head and respectively communicated with the back pressure cavity 7 and the compression cavity, when the piston head reciprocates to the annular groove, cavities on two sides of the piston head are communicated through the vent holes, unbalanced average pressure can be balanced, and the situation that the piston head deviates to one side is reduced.
As shown in fig. 1, the piston heads located inside the two linear motors 4 are low-pressure piston heads 31, the low-pressure piston heads 31 are arranged in the low-pressure cylinder body 1, an air inlet channel communicated with an air inlet and an air outlet channel communicated with the connecting pipeline 6 are radially formed in the low-pressure cylinder body 1, and a low-pressure air inlet valve 12 and a low-pressure air outlet valve 13 are respectively arranged. The piston heads positioned at the outer sides of the two linear motors 4 are high-pressure piston heads 32, the high-pressure piston heads 32 are arranged in the high-pressure cylinder body 2, an air outlet channel communicated with an air outlet and an air inlet channel communicated with the connecting pipeline 6 are axially formed in the high-pressure cylinder body 2, and a high-pressure exhaust valve 23 and a high-pressure air inlet valve 22 are respectively arranged. In actual operation, refrigerant enters the low-pressure cavity 11 through the low-pressure air inlet valve 12, is discharged through the low-pressure exhaust valve 13 after being compressed, enters the high-pressure cavity 21 through the high-pressure air inlet valve 22 after passing through the connecting pipeline 6, is compressed again in the high-pressure cavity 21, and is discharged through the high-pressure exhaust valve 23.
As shown in fig. 4, the piston heads located inside the two linear motors 4 are high-pressure piston heads 32, the high-pressure piston heads 32 are arranged in the high-pressure cylinder body 2, an air outlet channel communicated with an air outlet and an air inlet channel communicated with the connecting pipeline 6 are radially formed in the high-pressure cylinder body 2, and a high-pressure exhaust valve 23 and a high-pressure air inlet valve 22 are respectively arranged. The piston heads positioned at the outer sides of the two linear motors 4 are low-pressure piston heads 31, the low-pressure piston heads 31 are arranged in the low-pressure cylinder body 1, an air inlet channel connected with an air inlet and an air outlet channel communicated with the connecting pipeline 6 are axially formed in the low-pressure cylinder body 1, and a low-pressure air inlet valve 12 and a low-pressure air outlet valve 13 are respectively arranged. In actual operation, refrigerant enters the low-pressure cavity 11 through the low-pressure air inlet valve 12, is discharged through the low-pressure exhaust valve 13 after being compressed, enters the high-pressure cavity 21 through the high-pressure air inlet valve 22 after passing through the connecting pipeline 6, is compressed again in the high-pressure cavity 21, and is discharged through the high-pressure exhaust valve 23.
As shown in fig. 2, the piston heads located inside the two linear motors 4 are low-pressure piston heads 31, the low-pressure piston heads 31 are arranged in the low-pressure cylinder body 1, the piston heads located outside the two linear motors 4 are high-pressure piston heads 32, and the high-pressure piston heads 32 are arranged in the high-pressure cylinder body 2. The low-pressure piston head 31 is axially communicated with the low-pressure cavity 11 and the back pressure cavity 7, the low-pressure piston head 31 is provided with a low-pressure air inlet valve 12 communicated with the low-pressure cavity 11 and the back pressure cavity 7 thereof, and the low-pressure cylinder body 1 is radially provided with a low-pressure air outlet valve 13 communicated with the low-pressure cavity 11 and the high-pressure cavity 21. By the low pressure piston head 31 intake, the clearance volume can be reduced relative to the way the cylinder block directly intake, achieving better performance. An air outlet channel communicated with an air outlet and an air inlet channel communicated with a connecting pipeline 6 are axially formed in the high-pressure cylinder body 2, and a high-pressure exhaust valve 23 and a high-pressure air inlet valve 22 are respectively arranged. In actual operation, refrigerant enters the back pressure chamber 7 from the outside, enters the low pressure chamber 11 through the low pressure air inlet valve 12, is discharged through the low pressure air outlet valve 13 after being compressed, enters the high pressure chamber 21 through the high pressure air inlet valve 22 after passing through the connecting pipeline 6, is compressed again in the high pressure chamber 21, and is discharged through the high pressure air outlet valve 23.
As shown in fig. 5, the piston heads located inside the two linear motors 4 are high-pressure piston heads 32, the high-pressure piston heads 32 are arranged in the high-pressure cylinder body 2, the piston heads located outside the two linear motors 4 are low-pressure piston heads 31, and the low-pressure piston heads 31 are arranged in the low-pressure cylinder body 1. The high-pressure piston head 32 is axially communicated with the high-pressure cavity 21 and the back pressure cavity 7, the high-pressure piston head 32 is provided with a high-pressure exhaust valve 23 communicated with the high-pressure cavity 21 and the back pressure cavity 7 thereof, and the high-pressure cylinder body 2 is radially provided with a high-pressure air inlet valve 22 communicated with the high-pressure cavity 21 and the low-pressure cavity 11. By venting the high pressure piston head 32, the clearance volume can be reduced relative to directly venting from the cylinder block for better performance. An air inlet channel connected with an air inlet and an air outlet channel communicated with a connecting pipeline 6 are axially formed in the low-pressure cylinder body 1, and a low-pressure air inlet valve 12 and a low-pressure air outlet valve 13 are respectively arranged. In actual operation, refrigerant enters the low-pressure cavity 11 through the low-pressure air inlet valve 12, is discharged through the low-pressure exhaust valve 13 after being compressed, enters the high-pressure cavity 21 through the high-pressure air inlet valve 22 after passing through the connecting pipeline 6, is compressed again in the high-pressure cavity 21, and is discharged through the high-pressure exhaust valve 23 arranged on the high-pressure piston head 32 and enters the back pressure cavity 7.
As shown in fig. 3 and 6, the piston body 3 includes piston connecting rods 33 and piston heads connected to ends of the piston connecting rods 33 that are close to each other, that is, each piston connecting rod 33 is provided with only a single piston head in this structure, and the piston heads are connected to the piston connecting rods 33 by screw threads, welding, or the like. The piston connecting rod 33 is provided with a plate spring 5, the plate spring 5 is sleeved on the piston connecting rod 33, the central position is fixed through a pressing block, and the periphery is fixedly connected with the cylinder body through a screw. The leaf spring 5 may be of archimedes spiral type, circular involute type, eccentric circular involute type, or the like. The two piston heads are arranged in the same cylinder body, the piston heads divide the cylinder body into the high-pressure cavity 21 and the low-pressure cavity 11, that is, in the structure, the high-pressure cavity 21 and the low-pressure cavity 11 are positioned in the same cylinder body, the problem that the coaxiality deviation is large and cannot be controlled easily due to the fact that the high-pressure cavity 21 and the low-pressure cavity 11 are positioned on two sides of the piston connecting rod 33 is solved, the coaxiality deviation can be reduced, and the running stability of the piston heads is improved.
As shown in fig. 3, the cavities inside the two piston bodies 3 are low-pressure cavities 11, and the cylinder body can be called a low-pressure cylinder body 1; the chambers outside the two piston bodies 3 are high-pressure chambers 21, and the cylinder block can be called a high-pressure cylinder block 2. However, the low-pressure cylinder block 1 and the high-pressure cylinder block 2 do not have a boundary, and share the same cylinder block, and only the difference between the different compression states of the same cylinder block in the primary compression stage and the secondary compression stage is made. The middle part of the cylinder body is provided with a low-pressure air inlet valve 12 which is communicated with the low-pressure cavity 11 and the air inlet, and a low-pressure air outlet valve 13 which is communicated with the low-pressure cavity 11 and the high-pressure cavity 21. The cylinder block is provided at both ends with a high-pressure exhaust valve 23 communicating the high-pressure chamber 21 with the air outlet, and a high-pressure intake valve 22 communicating the high-pressure chamber 21 with the low-pressure chamber 11. In actual operation, refrigerant enters the low-pressure chamber 11 through the low-pressure air inlet valve 12, is discharged through the low-pressure air outlet valve 13 after being compressed, enters the high-pressure chamber 21 through the high-pressure air inlet valve 22 after passing through the connecting pipeline 6, is compressed again in the high-pressure chamber 21, and is discharged through the high-pressure air outlet valve 23.
As shown in fig. 6, the cavities inside the two piston bodies 3 are high-pressure cavities 21, and the cylinder body can be called a high-pressure cylinder body 2; the cavities outside the two piston bodies 3 are low-pressure cavities 11, and the cylinder body can be called a low-pressure cylinder body 1. However, the high-pressure cylinder block 2 and the low-pressure cylinder block 1 do not have a boundary, and share the same cylinder block, and only the difference between the different compression states of the same cylinder block in the primary compression stage and the secondary compression stage is made. The middle part of the cylinder block is provided with a high-pressure exhaust valve 23 which is communicated with the high-pressure cavity 21 and the exhaust port, and a high-pressure air inlet valve 22 which is communicated with the high-pressure cavity 21 and the low-pressure cavity 11. The cylinder block is provided at both ends thereof with a low-pressure intake valve 12 communicating the low-pressure chamber 11 with the intake port, and a low-pressure exhaust valve 13 communicating the low-pressure chamber 11 with the high-pressure chamber 21. In actual operation, refrigerant enters the low-pressure chamber 11 through the low-pressure air inlet valve 12, is discharged through the low-pressure air outlet valve 13 after being compressed, enters the high-pressure chamber 21 through the high-pressure air inlet valve 22 after passing through the connecting pipeline 6, is compressed again in the high-pressure chamber 21, and is discharged through the high-pressure air outlet valve 23.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A direct current linear compressor, characterized by: the piston body comprises one or two piston heads, the piston heads are arranged in the cylinder body, one or two compression cavities are formed in one side or two sides of the piston heads, the compression cavities comprise a high-pressure cavity and a low-pressure cavity, the high-pressure cavity and the low-pressure cavity are respectively located in two directions of reciprocating movement of the piston heads, the low-pressure cavity is connected with a low-pressure air inlet valve and a low-pressure exhaust valve, the high-pressure cavity is connected with a high-pressure air inlet valve and a high-pressure exhaust valve, a connecting pipeline is arranged between the low-pressure exhaust valve and the high-pressure air inlet valve, when the low-pressure cavity is compressed, the high-pressure cavity is expanded, when the low-pressure cavity is expanded, the high-pressure cavity is compressed, working media enter the high-pressure cavity through the connecting pipeline after being compressed, and the two-stage compression is completed again.
2. The direct current linear compressor according to claim 1, wherein: the cylinder body comprises a high-pressure cylinder body with a high-pressure cavity and a low-pressure cylinder body with a low-pressure cavity, the piston body comprises a piston connecting rod and piston heads connected to two ends of the piston connecting rod, the piston heads positioned on the inner sides of the two linear motors are arranged in the same cylinder body, and the piston heads positioned on the outer sides of the two linear motors are respectively arranged in separate cylinder bodies.
3. The direct current linear compressor according to claim 2, wherein: the low-pressure cylinder body is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the air inlet, and the low-pressure exhaust valve communicated with the low-pressure cavity and the high-pressure cavity; the high-pressure cylinder body is provided with the high-pressure exhaust valve communicated with the high-pressure cavity and the air outlet, and the high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity; the piston head is provided with a deviation adjusting hole, the deviation adjusting hole comprises an annular groove arranged on the inner wall of the cylinder body and a vent hole arranged on the piston head and communicated with the back pressure cavity and the compression cavity respectively, and different vent holes can be communicated at the annular groove.
4. A direct current linear compressor according to claim 3, wherein: the piston heads positioned at the inner sides of the two linear motors are low-pressure piston heads, the low-pressure piston heads are arranged in the low-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are high-pressure piston heads, and the high-pressure piston heads are arranged in the high-pressure cylinder body.
5. A direct current linear compressor according to claim 3, wherein: the piston heads positioned on the inner sides of the two linear motors are high-pressure piston heads, the high-pressure piston heads are arranged in the high-pressure cylinder body, the piston heads positioned on the outer sides of the two linear motors are low-pressure piston heads, and the low-pressure piston heads are arranged in the low-pressure cylinder body.
6. The direct current linear compressor according to claim 2, wherein: the piston heads positioned at the inner sides of the two linear motors are low-pressure piston heads, the low-pressure piston heads are arranged in the low-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are high-pressure piston heads, and the high-pressure piston heads are arranged in the high-pressure cylinder body; the low-pressure piston head is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the back pressure cavity thereof, and the low-pressure cylinder body is provided with the low-pressure exhaust valve communicated with the low-pressure cavity and the high-pressure cavity.
7. The direct current linear compressor according to claim 2, wherein: the piston heads positioned at the inner sides of the two linear motors are high-pressure piston heads, the high-pressure piston heads are arranged in the high-pressure cylinder body, the piston heads positioned at the outer sides of the two linear motors are low-pressure piston heads, and the low-pressure piston heads are arranged in the low-pressure cylinder body; the high-pressure piston head is provided with a high-pressure exhaust valve communicated with the high-pressure cavity and the back pressure cavity thereof, and the high-pressure cylinder body is provided with a high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity.
8. The direct current linear compressor according to claim 1, wherein: the piston body comprises a piston connecting rod and a piston head connected to the end part of the piston connecting rod, which is close to one end of the piston connecting rod, the two piston heads are arranged in the same cylinder body, and the piston head divides the cylinder body into the high-pressure cavity and the low-pressure cavity.
9. The direct current linear compressor according to claim 8, wherein: the cavity bodies on the inner sides of the two piston bodies are the low-pressure cavity, the cavity bodies on the outer sides of the two piston bodies are the high-pressure cavity, and the cylinder body is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the air inlet and the low-pressure air outlet valve communicated with the low-pressure cavity and the high-pressure cavity; the cylinder body is provided with the high-pressure exhaust valve communicated with the high-pressure cavity and the air outlet, and the high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity.
10. The direct current linear compressor according to claim 8, wherein: the cavity bodies on the inner sides of the two piston bodies are the high-pressure cavity, the cavity bodies on the outer sides of the two piston bodies are the low-pressure cavity, and the cylinder body is provided with the high-pressure exhaust valve communicated with the high-pressure cavity and the exhaust port and the high-pressure air inlet valve communicated with the high-pressure cavity and the low-pressure cavity; the cylinder body is provided with the low-pressure air inlet valve communicated with the low-pressure cavity and the air inlet, and the low-pressure exhaust valve communicated with the low-pressure cavity and the high-pressure cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311277471.2A CN117145725A (en) | 2023-10-07 | 2023-10-07 | Direct current linear compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311277471.2A CN117145725A (en) | 2023-10-07 | 2023-10-07 | Direct current linear compressor |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118188403A (en) * | 2024-05-16 | 2024-06-14 | 中国科学院上海技术物理研究所 | Multistage direct current linear compressor |
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2023
- 2023-10-07 CN CN202311277471.2A patent/CN117145725A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118188403A (en) * | 2024-05-16 | 2024-06-14 | 中国科学院上海技术物理研究所 | Multistage direct current linear compressor |
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