CN212429126U - Double-cylinder device for linear compressor and linear compressor - Google Patents

Abstract

The utility model provides a two cylinder device and linear compressor for linear compressor. The method comprises the following steps: a compression cylinder having a compression chamber, and a pushrod moving hole, a first outlet, and a second outlet, which are communicated with the compression chamber; the push rod is internally provided with an air inlet channel; the piston is arranged in the compression cavity and is arranged at one end of the push rod, so that the compression cavity is provided with a first cavity and a second cavity which are positioned at two sides of the piston, the first cavity is communicated with the first outlet, and the second cavity is communicated with the second outlet; an air inlet transition cavity, a first communicating port and a second communicating port are arranged in the piston, the air inlet transition cavity is communicated with the air inlet channel, the air inlet transition cavity is communicated with the first cavity through the first communicating port, and the air inlet transition cavity is communicated with the second cavity through the second communicating port; and the on-off control device is configured to controllably control the on-off of the first communication port, the second communication port, the first outlet and the second outlet. The two-way compression of a single piston is realized, so that the suction and exhaust of two-way refrigerants are realized, and a one-side double-cylinder structure is realized.

Description

Double-cylinder device for linear compressor and linear compressor

Technical Field

The utility model relates to a compression cylinder technical field especially relates to a two cylinder device and linear compressor for linear compressor.

Background

China is a large country for producing and applying refrigeration equipment, and a compressor is the key of the refrigeration equipment, so that the improvement of the performance of the compressor becomes the key point of research of various countries. The linear compressor is different from the traditional reciprocating compressor, reduces the transmission structure, reduces the friction loss and has higher effect. In order to continuously improve the performance of the linear compressor, various design ideas are continuously emerged, wherein a double-cylinder structure is an effective method for improving the efficiency of the linear compressor. However, the existing linear compressor is a structure that two ends of a motor are respectively provided with a group of cylinders, so that the effect of bidirectional exhaust can be well achieved, and the structure provided with two groups of cylinders needs corresponding parts and spaces, so that the use of materials is necessarily doubled, and the volume of the compressor is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome at least one defect of current linear compressor, provide a two cylinder device for linear compressor.

A further object of the present invention is to reduce the amount of material required and to reduce costs.

An object of the second aspect of the present invention is to provide a linear compressor having the above-mentioned double-cylinder device.

According to the utility model discloses an aspect, the utility model provides a two cylinder device for linear compressor, it includes:

a compression cylinder having a compression chamber, and a pushrod moving hole, a first outlet, and a second outlet which communicate with the compression chamber;

the push rod is arranged in the push rod moving hole, one end of the push rod extends into the compression cavity, and an air inlet channel is arranged in the push rod;

a piston disposed in the compression chamber and mounted to the one end of the pushrod such that the compression chamber has a first chamber and a second chamber on both sides of the piston, the first chamber being in communication with the first outlet, the second chamber being in communication with the second outlet; an air inlet transition cavity, a first communication port and a second communication port are arranged in the piston, the air inlet transition cavity is communicated with the air inlet channel, the air inlet transition cavity is communicated with the first cavity through the first communication port, and the air inlet transition cavity is communicated with the second cavity through the second communication port;

an on-off control device configured to controllably control on-off of the first communication port, the second communication port, the first outlet, and the second outlet.

Optionally, the first cavity and the second cavity are both arranged coaxially with the push rod moving hole; the piston includes a first plug portion that slides within the first chamber and a second plug portion that slides within the second chamber; the diameter of the first cavity is smaller than that of the second cavity, and the diameter of the first plug portion is smaller than that of the peripheral wall of the second plug portion, so that the peripheral wall of the piston is step-shaped.

Optionally, the compression cylinder includes a check ring disposed between the second chamber and the pushrod; the piston is provided with a yielding cavity for inserting the baffle ring, the yielding cavity is provided with an insertion opening, and the baffle ring is inserted into the yielding cavity through the insertion opening.

Optionally, the air inlet transition cavity and the abdicating cavity are the same cavity, and the baffle ring is used for sealing the air inlet transition cavity; or, the air inlet transition cavity is communicated with the yielding cavity, and the baffle ring is used for sealing the air inlet transition cavity and the yielding cavity.

Optionally, the abdicating cavity is a cylindrical cavity, and the push rod is inserted into the piston through the insertion opening.

Optionally, the push rod is inserted into the air inlet transition cavity, and a third communication port for communicating the air inlet transition cavity with the air inlet channel is arranged on the circumferential wall of the push rod.

Optionally, the first communication port and the second communication port are respectively arranged on the corresponding end faces of the piston, and the on-off control device comprises a first air suction valve plate for controlling on-off of the first communication port and a second air suction valve plate for controlling on-off of the second communication port, and the first air suction valve plate and the second air suction valve plate are respectively arranged on the corresponding end faces of the piston.

Optionally, the compression cylinder further has a first vent chamber for communicating the first chamber with the first outlet and a second vent chamber for communicating the second chamber with the second outlet;

the on-off control device comprises a first exhaust valve plate and a second exhaust valve plate, the first exhaust valve plate is arranged between the first exhaust cavity and the first cavity to control the on-off of the first outlet, and the second exhaust valve plate is arranged between the second exhaust cavity and the second cavity to control the on-off of the second outlet.

Optionally, the compression cylinder includes a cylinder body having the compression chamber, and a first cylinder cover and a second cylinder cover respectively disposed at two ends of the cylinder body, the first outlet is disposed on the first cylinder cover, and the second outlet is disposed on the second cylinder cover.

According to the utility model discloses a second aspect, the utility model provides a linear compressor, including linear electric motor and any kind of two cylinder device of the aforesaid, just the push rod of two cylinder device does linear electric motor's rotor pole.

The utility model discloses an among double-cylinder device and the compressor, because be provided with inlet channel in the push rod, be provided with the transitional chamber of admitting air in the piston, realize single piston two-way compression to realize inhaling of two-way refrigerant and exhaust, realize unilateral double-cylinder structure, can set up unilateral double-cylinder in one side of linear drive devices such as linear compressor promptly, reduce spare part and use, and rationally utilize inner space, under control cost's the condition, promote the compressor performance.

Further, the utility model discloses a two cylinder device and linear compressor compares in single cylinder compressor, can last the exhaust between the piston is relapse, has improved exhaust efficiency, has increased the refrigerating output, has promoted the press performance. Compared with other double-cylinder compressors, the double-cylinder compressor reduces a group of parts such as pistons, rotor rods and the like, requires less materials and has low cost. The two cylinders are compact on one side of the motor, the required space is small, the internal space of the compressor can be fully utilized, and the compressor is easy to produce in a small size.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic structural view of a double cylinder apparatus according to an embodiment of the present invention;

fig. 2 is a schematic exploded view of a dual cylinder device according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a dual cylinder device according to an embodiment of the present invention;

fig. 4 is a schematic partial cross-sectional view of a dual cylinder device according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a linear compressor according to an embodiment of the present invention;

fig. 6 is a schematic cut-away view of the compressor shown in fig. 5.

Detailed Description

Fig. 1 is a schematic structural view of a double cylinder device according to an embodiment of the present invention. As shown in fig. 1 and referring to fig. 2 to 4, an embodiment of the present invention provides a dual cylinder device for a linear compressor, which includes a compression cylinder 20, a push rod 10, a piston 30, and an on-off control device. The compression cylinder 20 has a compression chamber, and a pushrod moving hole communicating with the compression chamber, a first outlet 21, and a second outlet 22. The push rod 10 is arranged in the push rod moving hole, one end of the push rod 10 extends into the compression cavity, and an air inlet channel 11 is arranged in the push rod 10. The piston 30 is disposed in the compression chamber and is installed at one end of the push rod 10, so that the compression chamber has a first chamber 23 and a second chamber 24 at both sides of the piston 30, the first chamber 23 is communicated with the first outlet 21, and the second chamber 24 is communicated with the second outlet 22. An air inlet transition cavity 31, a first communication port 32 and a second communication port 33 are arranged in the piston 30, the air inlet transition cavity 31 is communicated with the air inlet channel 11, the air inlet transition cavity 31 is communicated with the first cavity 23 through the first communication port 32, and the air inlet transition cavity 31 is communicated with the second cavity 24 through the second communication port 33. The on-off control means is configured to controllably control on-off of the first communication port 32, the second communication port 33, the first outlet 21, and the second outlet 22.

When the double-cylinder device provided by the embodiment of the utility model works, when the push rod 10 moves towards the first cavity 23, the on-off control device controls the first communication port 32 to be closed, the first outlet 21 to be communicated, the second communication port 33 to be communicated and the second outlet 22 to be closed, gas such as refrigerant enters the second cavity 24 through the gas inlet channel 11 on the push rod 10, the gas inlet transition cavity 31 in the piston 30 and the second communication port 33, and the second cavity 24 realizes air suction; the gas in the first chamber 23 is compressed by the piston 30 and expelled through the first outlet 21, effecting the evacuation of the first chamber 23. When the push rod 10 moves towards the second cavity 24, the on-off control device controls the second communication port 33 to be closed, the second outlet 22 to be communicated, the first communication port 32 to be communicated and the first outlet 21 to be closed, gas such as refrigerant enters the first cavity 23 through the gas inlet channel 11 on the push rod 10, the gas inlet transition cavity 31 in the piston 30 and the first communication port 32, and the first cavity 23 realizes gas suction; the gas in the second chamber 24 is compressed by the piston 30 and expelled through the second outlet 22, effecting venting of the second chamber 24.

The utility model discloses among the double-cylinder device, because be provided with inlet channel 11 in the push rod 10, be provided with the transitional chamber 31 that admits air in the piston 30, can realize the two-way compression of single piston 30 to realize the exhaust of inhaling of two-way refrigerant, realize the two cylinder structure of unilateral, can set up the two cylinders of unilateral in one side of linear drive devices such as linear compressor promptly, reduce spare part and use, and rationally utilize the inner space, under the condition of control cost, promote the compressor performance. That is to say, this double-cylinder structure realizes the reciprocal two-way compression of linear compressor, improves exhaust efficiency, increases the refrigerating output, promotes the press performance. The single piston 30 is alternately reciprocated in the bidirectional cylinder, and the air suction and exhaust effect is generated, namely, the single piston 30 exhausts air in a double-cylinder reciprocating mode. The problem of air supply of the bidirectional piston 30 is solved.

In some embodiments of the present invention, the first cavity 23 and the second cavity 24 are both disposed coaxially with the push rod moving hole. The piston 30 includes a first plug portion 34 that slides within the first chamber 23 and a second plug portion 35 that slides within the second chamber 24. The diameter of the first cavity 23 is smaller than that of the second cavity 24, and the diameter of the first plug 34 is smaller than that of the outer peripheral wall of the second plug 35, so that the outer peripheral wall of the piston 30 is stepped. The compression cylinder 20 is designed in a two-step structure, and two steps form a cylinder cavity, so that a double-cylinder structure is realized. Namely, a double-stage step cylinder is adopted, and two stages form a cylinder cavity respectively, so that a double-cylinder structure is realized. And the two directions are communicated with the inner cavity through the internal channel structure of the two-stage step piston 30, so that the suction and exhaust of two-way refrigerants are realized. The ratio of the area of the compression surface for compression of the first plug 34 to the area of the compression surface for compression of the second plug 35 is 0.9 to 1.1, preferably 1, because the second plug 35 has a hole in the middle thereof to which the push rod 10 is mounted, so that the displacement of the first chamber 23 and the displacement of the second chamber 24 can be made as uniform as possible.

In some embodiments of the present invention, the compression cylinder 20 includes a baffle ring 25, and the baffle ring 25 is disposed between the second chamber 24 and the pushrod 10. The piston 30 has a relief cavity for insertion of the stopper ring 25, the relief cavity having an insertion opening through which the stopper ring 25 is inserted into the relief cavity. Further, the air inlet transition cavity 31 and the yielding cavity are the same cavity, and the baffle ring 25 is used for sealing the air inlet transition cavity 31. Or the air inlet transition cavity 31 is communicated with the yielding cavity, and the baffle ring 25 is used for sealing the air inlet transition cavity 31 and the yielding cavity. Further, the abdicating cavity is a cylindrical cavity, and the push rod 10 is inserted into the piston 30 through the insertion opening. The design of the piston 30 and the installation of parts are convenient, and the structure is simple and compact. In some alternative embodiments, the air intake transition chamber 31 and the abdicating chamber are two unrelated structures.

In some embodiments of the present invention, the push rod 10 is inserted into the air inlet transition chamber 31, and a third communication port 12 for communicating the air inlet transition chamber 31 with the air inlet channel 11 is provided on the peripheral wall of the push rod 10. The gas flow is convenient, the structure strength is good, and the push rod 10 and the inner wall of the piston 30 form a transition chamber together. In some alternative embodiments of the present invention, the third communicating port is provided on the end surface of the push rod 10.

In some embodiments of the present invention, the first communicating port 32 and the second communicating port 33 are respectively disposed on the corresponding end surfaces of the piston 30, and both the first communicating port 32 and the second communicating port 33 extend in a direction parallel to the push rod 10. The on-off control device comprises a first air suction valve plate 41 for controlling the on-off of the first communication port 32 and a second air suction valve plate 42 for controlling the on-off of the second communication port 33, which are respectively arranged on the corresponding end surfaces of the piston 30. The compression cylinder 20 also has a first vent chamber for communicating the first chamber 23 with the first outlet 21 and a second vent chamber 26 for communicating the second chamber 24 with the second outlet 22. The on-off control device further comprises a first exhaust valve plate 43 and a second exhaust valve plate 44, the first exhaust valve plate 43 is arranged between the first exhaust cavity and the first cavity 23 to control the on-off of the first outlet 21, and the second exhaust valve plate 44 is arranged between the second exhaust cavity 26 and the second cavity 24 to control the on-off of the second outlet 22.

In some embodiments of the present invention, the compression cylinder 20 includes a cylinder body 51 having a compression chamber, and a first cylinder cover 52 and a second cylinder cover 53 respectively disposed at two ends of the cylinder body 51, the first outlet 21 is disposed on the first cylinder cover 52, and the second outlet 22 is disposed on the second cylinder cover 53. The first exhaust valve plate 43 is arranged between the first cylinder cover 52 and the cylinder body 51, the cylinder gasket 45 is arranged between the first exhaust valve plate 43 and the cylinder body 51, and the spring 46 can be arranged between the first exhaust valve plate 43 and the first cylinder cover 52. A valve plate 54 is arranged between the second cylinder head 53 and the cylinder block 51, a valve plate gasket 55 is arranged between the valve plate 54 and the cylinder block 51, and the second exhaust valve plate 44 is arranged between the second cylinder head 53 and the valve plate 54, and an outer gasket 56 and an inner gasket 57 are further arranged here. The retainer ring 25 may be disposed on the second cylinder head 53. The inner side of the baffle ring 25 is provided with a push rod moving hole. The inner gasket is compressed by the second cylinder cover 53 and the valve plate, so that the second cylinder cover 53 is sealed, and the sealing problem of the cylinder can be solved. Only 6 bolts are needed to be screwed for connection and fixation among all the parts, the assembly process is simple, and the production is convenient.

Fig. 5 is a schematic structural diagram of a linear compressor according to an embodiment of the present invention, as shown in fig. 4 and referring to fig. 6, an embodiment of the present invention further provides a linear compressor, which includes a linear motor 60 and any one of the above-mentioned two-cylinder devices, and the push rod 10 of the two-cylinder device is a moving rod of the linear motor. The linear compressor further comprises a shell 71, an oil supply system. The linear motor 60 may include a mover frame, a magnet, a stator core, a stator frame, and a coil. The oil supply system comprises an oil suction valve plate, an oil suction pipe and the like. An intake silencer 72 may be provided at an inlet of the intake passage 11. The first outlet 21 and the second outlet 22 may be vented to the outside through a gas collecting and muffling package 73.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A double cylinder device for a linear compressor, comprising:

a compression cylinder having a compression chamber, and a pushrod moving hole, a first outlet, and a second outlet which are communicated with the compression chamber;

the push rod is arranged in the push rod moving hole, one end of the push rod extends into the compression cavity, and an air inlet channel is arranged in the push rod;

a piston disposed in the compression chamber and mounted to the one end of the pushrod such that the compression chamber has a first chamber and a second chamber on both sides of the piston, the first chamber being in communication with the first outlet, the second chamber being in communication with the second outlet; an air inlet transition cavity, a first communication port and a second communication port are arranged in the piston, the air inlet transition cavity is communicated with the air inlet channel, the air inlet transition cavity is communicated with the first cavity through the first communication port, and the air inlet transition cavity is communicated with the second cavity through the second communication port;

an on-off control device configured to control on-off of the first communication port, the second communication port, the first outlet, and the second outlet.

2. The dual cylinder device of claim 1,

the first cavity and the second cavity are coaxially arranged with the push rod moving hole;

the piston includes a first plug portion that slides within the first chamber and a second plug portion that slides within the second chamber;

the diameter of the first cavity is smaller than that of the second cavity, and the diameter of the first plug part is smaller than that of the peripheral wall of the second plug part;

the ratio between the area of the compression surface for compression of the first plug portion and the area of the compression surface for compression of the second plug portion is 0.9 to 1.1.

3. The dual cylinder device of claim 1,

the compression cylinder includes a retainer ring disposed between the second chamber and the pushrod;

the piston is provided with a yielding cavity for inserting the baffle ring, the yielding cavity is provided with an insertion opening, and the baffle ring is inserted into the yielding cavity through the insertion opening.

4. The dual cylinder device of claim 3,

the air inlet transition cavity and the abdicating cavity are the same cavity, and the baffle ring is used for sealing the air inlet transition cavity; or, the air inlet transition cavity is communicated with the yielding cavity, and the baffle ring is used for sealing the air inlet transition cavity and the yielding cavity.

5. The dual cylinder device of claim 3,

the push rod is inserted into the piston through the insertion opening.

6. The dual cylinder device of claim 1,

the push rod is inserted into the air inlet transition cavity, and a third communicating opening which is communicated with the air inlet transition cavity and the air inlet channel is formed in the peripheral wall of the push rod.

7. The dual cylinder device of claim 1,

the first communication port and the second communication port are respectively arranged on the corresponding end surfaces of the piston,

the on-off control device comprises a first air suction valve plate for controlling the on-off of the first communication port and a second air suction valve plate for controlling the on-off of the second communication port, and the first air suction valve plate and the second air suction valve plate are respectively arranged on the corresponding end faces of the piston.

8. The dual cylinder device of claim 1,

the compression cylinder is also provided with a first exhaust cavity and a second exhaust cavity, the first exhaust cavity is used for communicating the first cavity with the first outlet, and the second exhaust cavity is used for communicating the second cavity with the second outlet;

the on-off control device comprises a first exhaust valve plate and a second exhaust valve plate, the first exhaust valve plate is arranged between the first exhaust cavity and the first cavity to control the on-off of the first outlet, and the second exhaust valve plate is arranged between the second exhaust cavity and the second cavity to control the on-off of the second outlet.

9. The dual cylinder device of claim 1,

the compression cylinder is including having the cylinder body in compression chamber, and set up respectively in the first cylinder cap and the second cylinder cap at cylinder body both ends, first export set up in on the first cylinder cap, the second export set up in on the second cylinder cap.

10. A linear compressor comprising a linear motor, characterized by further comprising the double cylinder device of any one of claims 1 to 9, and the push rod of the double cylinder device is a rotor rod of the linear motor.

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