Multi-cylinder compressor

Abstract

The invention relates to the technical field of compressors, in particular to a multi-cylinder compressor which comprises a plurality of air cylinders arranged in sequence, a crankshaft is arranged in each air cylinder in a penetrating mode, the crankshafts in the adjacent air cylinders are connected through a variable speed transmission mechanism, and one of the multiple crankshafts is driven by a motor to rotate. Under the conditions that the structural size and the volume of the air cylinders are not changed and the structures and the displacements of the air cylinders are the same, the variable-speed transmission mechanisms between the adjacent air cylinders change the rotating speeds of the crankshafts in the different air cylinders, so that the different air cylinders run at different speeds, and the refrigerating or heating capacity difference of the different air cylinders is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a multi-cylinder compressor. Background Art

[0002] like Figure 1 As shown, a conventional multi-cylinder rotor compressor includes a motor 1, a pump body 2, a crankshaft 3 and a casing 4. The pump body 2 includes a plurality of cylinders 20. The stator 11 of the motor 1 and the pump body 2 are both fixed on the casing 3. The crankshaft 4 has a motor section fixedly connected to the rotor 12 of the motor 1 and a pump body section provided with a plurality of eccentric parts. The plurality of eccentric parts are arranged in a one-to-one correspondence in the plurality of cylinders 20 and are respectively provided with pistons. The crankshaft 4 is driven to rotate by the rotor 12 of the motor 1, and the eccentric parts and pistons are driven to synchronously perform eccentric operation in the corresponding cylinder 20, so that the refrigerant is compressed at the same rate by each cylinder 20.

[0003] In some application scenarios, different cylinders 20 in the pump body 2 are required to have different cooling / heating capabilities. To achieve the capacity differences of different cylinders 20, the conventional multi-cylinder rotor compressor structure can only achieve the volume differences of different cylinders 20 by changing the structural dimensions of the cylinders 20, such as changing the cylinder height, piston outer diameter, eccentricity and other parameters. Due to the spatial structure limitations of the pump body 2, this method of changing the structural dimensions of the cylinders 20 is difficult to achieve a significant change in the capacity differences of different cylinders 20, and it will increase the number of parts with similar structures, which is not conducive to the management of parts during the standardization process. Summary of the invention

[0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a multi-cylinder compressor capable of achieving capacity differences between different cylinders.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a multi-cylinder compressor, comprising a plurality of cylinders arranged in sequence, wherein a crankshaft is respectively provided in each cylinder, the crankshafts in adjacent cylinders are connected via a speed-changing transmission mechanism, and one of the plurality of crankshafts is driven to rotate by a motor.

[0007] Preferably, the crankshaft in one of the adjacent cylinders is connected to the input end of the speed transmission mechanism or is an integrally designed integral part, and the crankshaft in the other of the adjacent cylinders is connected to the output end of the speed transmission mechanism or is an integrally designed integral part.

[0008] Preferably, the input end of the speed change transmission mechanism is connected to the corresponding crankshaft by any one of a flat key, a spline, and a threaded connection.

[0009] Preferably, the output end of the speed change transmission mechanism is connected to the corresponding crankshaft by any one of a flat key, a spline, and a threaded connection.

[0010] Preferably, the speed change transmission mechanism is a planetary gear mechanism.

[0011] Preferably, the planetary gear mechanism includes a sun gear, planetary gears, a planetary carrier, a fixed outer shell and an inner gear ring arranged on the inner surface of the outer shell, one side of the planetary gear is meshed with the sun gear, and the other side is meshed with the inner gear ring, the planetary carrier is connected to the planetary gear, the crankshaft in one of the adjacent cylinders is connected to the sun gear or is an integral part of an integral design, and the crankshaft in another cylinder of the adjacent cylinders is connected to the planetary carrier or is an integral part of an integral design.

[0012] Preferably, the speed change transmission mechanism and the cylinder are connected via a connecting piece.

[0013] Preferably, it also includes a shell, and the cylinder and the speed change transmission mechanism are both connected to the connecting member and placed inside the shell.

[0014] Preferably, a cylinder cover is further included, one side of the cylinder is sealed by a connecting piece, and the other side of the cylinder is sealed by a connecting piece or the cylinder cover to form a working chamber inside the cylinder.

[0015] Preferably, the motor includes a stator and a rotor arranged inside the stator, the stator is connected to the housing, and the rotor is connected to one of the plurality of crankshafts.

[0016] Compared with the prior art, the present invention has significant improvements:

[0017] The multi-cylinder compressor of the present invention is provided with a speed-changing transmission mechanism between adjacent cylinders, the speeds of the input end and the output end of the speed-changing transmission mechanism are different, and the crankshafts in the adjacent cylinders are connected by the speed-changing transmission mechanism, so that the crankshaft speeds of the cylinders on both sides of the speed-changing transmission mechanism are different, thereby realizing different cylinders running at different speeds. Therefore, the multi-cylinder compressor of the present invention can change the speeds of the crankshafts in different cylinders by the speed-changing transmission mechanism between adjacent cylinders without changing the structural dimensions and volume of the cylinders, and the structure and displacement of each cylinder are the same, so that different cylinders run at different speeds, thereby realizing different refrigeration or heating capabilities of different cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a conventional multi-cylinder rotor compressor in the prior art.

[0019] Figure 2 Schematic diagram of the structure of a multi-cylinder compressor according to an embodiment of the present invention.

[0020] The reference numerals are described as follows:

[0021] 1 Motor

[0022] 11. Stator

[0023] 12 Rotor

[0024] 2 Pump body

[0025] 20 Cylinders

[0026] 3 Crankshaft

[0027] 4 Housing

[0028] 200 Cylinder

[0029] 201 First Cylinder

[0030] 202 Second Cylinder

[0031] 300 Crankshaft

[0032] 301 First Crankshaft

[0033] 302 Second Crankshaft

[0034] 400 Speed ​​Shifting Mechanism

[0035] 500 Connectors

[0036] 501 First connecting piece

[0037] 502 Second connecting piece

[0038] 600 Cylinder Head

[0039] 601 First Cylinder Head

[0040] 602 Second cylinder head DETAILED DESCRIPTION

[0041] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0045] like Figure 2 The figure shows an embodiment of the multi-cylinder compressor provided by the present invention.

[0046] The multi-cylinder compressor of this embodiment includes a plurality of cylinders 200 arranged in sequence, each cylinder 200 is respectively provided with a crankshaft 300, the crankshaft 300 has an eccentric portion located inside the cylinder 200 and two ends extending outside the cylinder 200, and the eccentric portion of the crankshaft 300 drives the piston to perform eccentric operation inside the cylinder 200 to achieve compression of the refrigerant introduced into the cylinder 200, thereby achieving the cooling or heating capacity of the cylinder 200.

[0047] In this embodiment, the crankshafts 300 in adjacent cylinders 200 are connected via a speed change transmission mechanism 400, and one of the multiple crankshafts 300 is driven to rotate by the motor 1. Thus, the rotation speed provided by the motor 1 is transmitted to the crankshaft 300 in one cylinder 200, and then the rotation speed is changed by the speed change transmission mechanism 400 and transmitted to the crankshafts 300 in other cylinders 200, so that the rotation speeds of the crankshafts 300 in each cylinder 200 are different.

[0048] The cooling or heating capacity of the cylinder 200 is equal to the product of the cylinder displacement and the rotational speed. Therefore, in addition to changing the cylinder capacity by changing the cylinder displacement (changing the cylinder volume by changing the cylinder structure size), the capacity difference between different cylinders 200 can also be achieved by changing the rotational speed. However, conventional multi-cylinder rotary compressors cannot achieve the change of the rotational speed between different cylinders. The multi-cylinder compressor of this embodiment is provided with a speed transmission mechanism 400 between adjacent cylinders 200. The input end and the output end of the speed transmission mechanism 400 have different rotational speeds. The speed transmission mechanism 400 connects the crankshafts 300 in the adjacent cylinders 200, so that the crankshafts 300 of the cylinders 200 on both sides of the speed transmission mechanism 400 have different rotational speeds, thereby achieving different speed operation of different cylinders 200. Therefore, the multi-cylinder compressor of this embodiment can change the rotation speed of the crankshaft 300 in different cylinders 200 by the speed transmission mechanism 400 between adjacent cylinders 200 without changing the structural size and volume of the cylinder 200 and under the condition that the structure and displacement of each cylinder 200 are the same, so that different cylinders 200 can operate at different speeds and achieve differences in cooling or heating capabilities of different cylinders 200.

[0049] In this embodiment, preferably, the crankshaft 300 in one of the adjacent cylinders 200 is connected to the input end of the speed transmission mechanism 400 or is an integral part designed as one piece, and the crankshaft 300 in the other of the adjacent cylinders 200 is connected to the output end of the speed transmission mechanism 400 or is an integral part designed as one piece. The input end and the output end of the speed transmission mechanism 400 are connected to the corresponding crankshaft 300, which is conducive to the assembly and assembly of the speed transmission mechanism 400. The input end and the output end of the speed transmission mechanism 400 are integral parts designed as one piece with the corresponding crankshaft 300, which is conducive to the assembly and integrity of the compressor.

[0050] Preferably, the input end of the speed change transmission mechanism 400 is connected to the corresponding crankshaft 300 by any one of a flat key, a spline, and a threaded connection. The output end of the speed change transmission mechanism 400 is connected to the corresponding crankshaft 300 by any one of a flat key, a spline, and a threaded connection. The above connection methods all have the advantages of easy assembly and good connection reliability. Of course, the connection method between the input end and the output end of the speed change transmission mechanism 400 and the corresponding crankshaft 300 is not limited to the above connection method, and other connection methods that can realize the transmission of rotational power can also be adopted.

[0051] In a preferred embodiment, the speed change transmission mechanism 400 is a planetary gear mechanism. The planetary gear mechanism includes a sun gear, a planetary gear, a planetary support, a fixed housing and an inner gear ring arranged on the inner surface of the housing, one side of the planetary gear is meshed with the sun gear, the other side of the planetary gear is meshed with the inner gear ring, and the planetary support is connected to the planetary gear. Power is input from the sun gear and output from the planetary support, and the output speed is different from the input speed. That is, the sun gear is the input end of the speed change transmission mechanism 400, the planetary support is the output end of the speed change transmission mechanism 400, and the planetary gear mechanism realizes that the input end and the output end of the speed change transmission mechanism 400 have different speeds. The crankshaft 300 in one of the adjacent cylinders 200 is connected to the sun gear or is an integral part of an integral design, and the crankshaft 300 in another of the adjacent cylinders 200 is connected to the planetary support or is an integral part of an integral design. Among them, the crankshaft 300 driven and rotated by the motor 1 is connected to the sun gear or is an integral part of an integral design.

[0052] In this embodiment, preferably, the speed change transmission mechanism 400 and the cylinder 200 are connected via a connecting member 500 to achieve installation and positioning of the speed change transmission mechanism 400 inside the multi-cylinder compressor.

[0053] The multi-cylinder compressor of this embodiment further includes a housing 4, which is a hollow structure. The cylinders 200 and the speed transmission mechanism 400 are both connected to the connecting member 500 and placed inside the housing 4. The multiple cylinders 200 and the speed transmission mechanism 400 between each adjacent cylinder 200 are connected to form an integral structure through the connecting member 500 to achieve installation and fixation of the integral structure. The speed transmission mechanism 400 is a planetary gear mechanism, and the housing of the planetary gear mechanism can be connected and fixed to the connecting member 500, thereby achieving the fixed setting of the housing of the planetary gear mechanism. Preferably, the cylinder 200 and the speed transmission mechanism 400 are connected to the connecting member 500 by bolt fastening.

[0054] The multi-cylinder compressor of this embodiment further includes a cylinder head 600, one side of the cylinder 200 is sealed by a connector 500, and the other side of the cylinder 200 is sealed by a connector 500 or a cylinder head 600 to form a working chamber inside the cylinder 200. That is, when the number of cylinders 200 is two, the speed change transmission mechanism 400 is located between the two cylinders 200, and the cylinder 200 is connected to the speed change transmission mechanism 400 by a connector 500. At this time, one side of the cylinder 200 is sealed by the cylinder head 600, and the other side is sealed by the connector 500 to form a working chamber inside the cylinder 200. When the number of cylinders 200 is greater than two, one side of the cylinder 200 is sealed by the connector 500 and connected to the speed change transmission mechanism 400, and the other side can be sealed by the cylinder head 600 to form a working chamber inside the cylinder 200, or sealed by the connector 500 to form a working chamber inside the cylinder 200 and connected to another cylinder 200. The integral structure formed by the cylinder 200 and the speed change transmission mechanism 400 connected via the connecting member 500 can be fixedly connected to the housing 4 via the cylinder cover 600. Preferably, the cylinder cover 600 is connected to the housing 4 by welding.

[0055] In this embodiment, preferably, the motor 1 is arranged inside the housing 4. The motor 1 includes a stator 11 and a rotor 12 arranged inside the stator 11. The stator 11 is connected to the housing 4, and the stator 11 can be fixed to the housing 4 by shrink fitting and / or welding. The rotor 12 is connected to one of the multiple crankshafts 300, and the rotor 12 and the corresponding crankshaft 300 can be connected and fixed by interference fit.

[0056] In the multi-cylinder compressor of this embodiment, the number of cylinders 200 is not limited and can be designed according to actual application requirements. Figure 2The example shown is a two-cylinder compressor, in which two cylinders 200 are provided, namely, a first cylinder 201 and a second cylinder 202. Accordingly, a first crankshaft 301 is inserted into the first cylinder 201, a second crankshaft 302 is inserted into the second cylinder 202, a speed transmission mechanism 400 is provided between the first cylinder 201 and the second cylinder 202, the speed transmission mechanism 400 (such as the housing of the planetary gear mechanism) and the first cylinder 201 are connected through a first connecting member 501, and the speed transmission mechanism 400 (such as the housing of the planetary gear mechanism) and the second cylinder 202 are connected through a second connecting member 502, so that the first cylinder 201, the speed transmission mechanism 400 and the second cylinder 202 are connected to form an integral structure. One side of the first cylinder 201 is sealed by the first cylinder head 601, and the other side is sealed by the first connecting member 501, so as to form a working chamber inside the first cylinder 201. One side of the second cylinder 202 is sealed by the second cylinder head 602, and the other side is sealed by the second connecting member 502 to form a working chamber inside the second cylinder 202. One end of the first crankshaft 301 is connected to the rotor 12 of the motor 1, and the other end of the first crankshaft 301 is connected to the input end of the speed transmission mechanism 400 (such as the sun gear of the planetary gear mechanism), and the output end of the speed transmission mechanism 400 (such as the planetary support of the planetary gear mechanism) is connected to one end of the second crankshaft 302. In this way, the motor 1 can drive the first cylinder 201 and the second cylinder 202 to run at different speeds. On this basis, according to actual needs, any number of speed transmission mechanisms 400 and cylinder 200 combination structures can also be connected to the other end of the second crankshaft 302 to form a multi-cylinder compressor with more stages.

[0057] The multi-cylinder compressor of this embodiment may be a vertical compressor or a horizontal compressor.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-cylinder compressor, characterized in that: The invention comprises a plurality of cylinders (200) arranged in sequence, wherein a crankshaft (300) is respectively inserted into each of the cylinders (200), the crankshafts (300) in adjacent cylinders (200) are connected via a speed transmission mechanism (400), and one of the plurality of crankshafts (300) is driven by a motor (1) to rotate.

2. The multi-cylinder compressor according to claim 1, characterized in that: The crankshaft (300) in one of the adjacent cylinders (200) is connected to the input end of the speed change transmission mechanism (400) or is an integral part designed as an integral unit, and the crankshaft (300) in another of the adjacent cylinders (200) is connected to the output end of the speed change transmission mechanism (400) or is an integral part designed as an integral unit.

3. The multi-cylinder compressor according to claim 2, characterized in that: The input end of the speed change transmission mechanism (400) is connected to the corresponding crankshaft (300) by any one of a flat key, a spline, and a threaded connection.

4. The multi-cylinder compressor according to claim 2, characterized in that: The output end of the speed change transmission mechanism (400) is connected to the corresponding crankshaft (300) by any one of a flat key, a spline, and a threaded connection.

5. The multi-cylinder compressor according to claim 1, characterized in that: The speed change transmission mechanism (400) is a planetary gear mechanism.

6. The multi-cylinder compressor according to claim 5, characterized in that: The planetary gear mechanism comprises a sun gear, planetary gears, a planetary carrier, a fixedly arranged outer shell and an inner gear ring arranged on the inner surface of the outer shell, one side of the planetary gear is meshed with the sun gear, and the other side is meshed with the inner gear ring, the planetary carrier is connected to the planetary gear, the crankshaft (300) in one of the adjacent cylinders (200) is connected to the sun gear or is an integral part of an integral design, and the crankshaft (300) in another of the adjacent cylinders (200) is connected to the planetary carrier or is an integral part of an integral design.

7. The multi-cylinder compressor according to claim 1, characterized in that: The speed change transmission mechanism (400) and the cylinder (200) are connected via a connecting member (500).

8. The multi-cylinder compressor according to claim 7, characterized in that: It also includes a housing (4), wherein the cylinder (200) and the speed change transmission mechanism (400) are both connected to the connecting member (500) and are placed inside the housing (4).

9. The multi-cylinder compressor according to claim 7, characterized in that: It also includes a cylinder head (600), one side of the cylinder (200) is sealed by the connecting piece (500), and the other side of the cylinder (200) is sealed by the connecting piece (500) or the cylinder head (600), so as to form a working chamber inside the cylinder (200).

10. The multi-cylinder compressor according to claim 8, characterized in that: The motor (1) comprises a stator (11) and a rotor (12) arranged inside the stator (11); the stator (11) is connected to the housing (4); and the rotor (12) is connected to one of the plurality of crankshafts (300).

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