Compressor with transmission and cylinder cover structure thereof

Abstract

The invention relates to the technical field of compressors, in particular to a cylinder cover structure of a compressor with a transmission and the compressor comprising the cylinder cover structure and provided with the transmission. The cylinder cover structure comprises a cylinder cover body and a support portion, one side of the cylinder cover body is used for being connected with and sealing one end, close to a transmission, of an air cylinder of a pump body, the support portion is fixedly arranged on the other side of the cylinder cover body and used for being connected with the transmission, an inner hole penetrating in the axial direction is formed in the cylinder cover body, and a crankshaft penetrates through the inner hole. The transmission is fixed through the support part on the cylinder cover structure, and the transmission is directly fixed on the support part of the cylinder cover structure, so that the assembly coaxiality of the transmission additionally arranged in the compressor can be effectively improved, the number of parts in the compressor and the assembly cost are reduced, and the overall axial length of the compressor can be effectively reduced; the overall axial stability of the compressor is guaranteed, and the vibration noise and the lubricating state of the compressor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a cylinder head structure of a compressor with a transmission and a compressor with a transmission comprising the cylinder head structure. Background Art

[0002] Conventional rolling rotor compressors use motors to drive the pump body to achieve synchronous operation. In order to make full use of the characteristics of high efficiency of the motor at high speeds and high efficiency of the pump body at low speeds, it is considered to add a transmission between the motor and the pump body in the compressor to achieve asynchronous operation of the motor and the pump body, thereby improving the overall efficiency of the compressor. In order to realize the function of torque transmission from the motor to the pump body, the transmission is a newly added independent component, and the connection and fixation method with the associated components inside the compressor is crucial. In order to better fix the transmission, it is necessary to set a connection structure inside the compressor to support the transmission. The welding of this connection structure to the compressor housing may make it difficult to coaxially assemble rotating parts such as the crankshaft on the pump body side and the power shaft on the motor side. It also increases the cost and number of parts of the compressor, and increases the overall axial length of the compressor, which is not conducive to the overall axial stability, vibration noise and lubrication status of the compressor. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a cylinder head structure of a compressor with a transmission, which can fix the transmission and improve the assembly coaxiality of the transmission added in the compressor and the axial stability of the compressor as a whole.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a cylinder head structure of a compressor with a transmission, wherein the input end and the output end of the transmission are respectively connected to the power shaft on the motor side of the compressor and the crankshaft on the pump body side, and the cylinder head structure comprises a cylinder head body and a bracket part, one side of the cylinder head body is used to connect and seal one end of the cylinder of the pump body close to the transmission, the bracket part is fixedly arranged on the other side of the cylinder head body and is used to connect the transmission, and an inner hole which penetrates along the axial direction is provided on the cylinder head body, and the inner hole is used for the crankshaft to pass through.

[0006] Preferably, a journal extends from a side surface of the cylinder head body away from the cylinder, the inner hole penetrates the journal axially, and the bracket portion is arranged on the outer peripheral surface of one end of the journal away from the cylinder head body.

[0007] Preferably, the bracket portion is connected to the shaft journal by interference fit.

[0008] Preferably, the bracket portion is welded to the cylinder head body.

[0009] Preferably, the bracket portion and the cylinder head body are an integral part designed in one piece.

[0010] Preferably, an oil groove is provided on the hole wall of the inner hole.

[0011] Preferably, the bracket portion is used to connect to a transmission housing of a transmission.

[0012] The present invention also provides a compressor with a transmission, comprising the cylinder head structure of the compressor with a transmission as described above.

[0013] Preferably, it also includes a motor, a pump body, a power shaft driven to rotate by the motor, a crankshaft passing through the cylinder of the pump body, and a transmission connecting the power shaft and the crankshaft. The cylinder head body is connected to and seals one end of the cylinder close to the transmission. The transmission is connected to the bracket part through the transmission housing, and the crankshaft is connected to the output end of the transmission after passing through the inner hole.

[0014] Preferably, the transmission housing and the bracket portion are connected by bolts.

[0015] Compared with the prior art, the present invention has significant improvements:

[0016] The present invention adds a bracket portion to the cylinder head body, fixes the transmission by the bracket portion on the cylinder head structure, and radially limits the crankshaft passing through the cylinder head body and the output end of the transmission fixedly connected to the crankshaft by the inner hole on the cylinder head body, so as to realize that the transmission is directly fixed to the bracket portion of the cylinder head structure. On the one hand, it can greatly reduce the difficulty of coaxially assembling the crankshaft on the pump body side and the power shaft on the motor side of the compressor with the transmission, and effectively improve the assembly coaxiality of the transmission added in the compressor; on the other hand, there is no need to add additional connecting components to fix the transmission, thereby reducing the number of internal parts and assembly costs of the compressor, and can effectively reduce the overall axial length of the compressor, ensure the overall axial stability of the compressor, and improve the vibration, noise and lubrication state of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the connection between the cylinder head structure of the compressor with a transmission, the transmission and the pump body according to an embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional schematic diagram of the connection between the cylinder head structure of the compressor with a transmission and the transmission according to an embodiment of the present invention.

[0019] Figure 3 It is a structural schematic diagram of an implementation manner of a cylinder head structure of a compressor with a transmission according to an embodiment of the present invention.

[0020] Figure 4 It is a structural schematic diagram of another implementation manner of the cylinder head structure of the compressor with a transmission according to an embodiment of the present invention.

[0021] The reference numerals are described as follows:

[0022] 1 Cylinder head structure

[0023] 11 Cylinder head body

[0024] 12 Bracket

[0025] 13 inner hole

[0026] 14 Journal

[0027] 15 Oil tank

[0028] 2 Transmission

[0029] 21 Sun gear

[0030] 22 Planetary gear

[0031] 23 Planetary bracket

[0032] 24 Transmission housing

[0033] 3 Power shaft

[0034] 4 Crankshaft

[0035] 5 Rotor

[0036] 6 Cylinders DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0041] like Figures 1 to 4 As shown, an embodiment of the cylinder head structure of a compressor with a transmission provided by the present invention is shown.

[0042] The cylinder head structure 1 of this embodiment is suitable for a compressor with a transmission 2. Figure 1 and Figure 2 In a compressor with a transmission 2, the input end and the output end of the transmission 2 are respectively connected to the power shaft 3 on the motor side of the compressor and the crankshaft 4 on the pump body side. The power shaft 3 is driven by the rotor 5 of the motor to rotate synchronously therewith. The pump body is provided with a cylinder 6, and the crankshaft 4 is inserted into the cylinder 6. The input end of the transmission 2 is connected to the power shaft 3 and rotates synchronously, and is used to receive the rotational torque from the power shaft 3. The output end of the transmission 2 is connected to the crankshaft 4 and rotates synchronously, and is used to output torque to the crankshaft 4 to drive the crankshaft 4 to operate. The input end and the output end of the transmission 2 are connected by a speed transmission mechanism, that is, the output speed of the output end is different from the input speed of the input end, so that the speed of the crankshaft 4 on the pump body side is different from the speed of the power shaft 3 on the motor side, and the motor and pump body of the compressor can be asynchronously operated.

[0043] See also Figure 1 and Figure 2 The cylinder head structure 1 of this embodiment includes a cylinder head body 11 and a bracket portion 12. One side of the cylinder head body 11 is used to connect and seal the end of the cylinder 6 of the pump body close to the transmission 2 to form a closed pump body structure, that is, the cylinder head body 11 is used to realize the original function of the cylinder head in the compressor. The bracket portion 12 is fixedly arranged on the other side of the cylinder head body 11, and the bracket portion 12 is used to connect the transmission 2 to realize the installation and fixation of the transmission 2. Preferably, the bracket portion 12 is used to connect the transmission housing 24 of the transmission 2, that is, the transmission 2 is connected to the bracket portion 12 through the transmission housing 24, so that the transmission 2 is connected and fixed to the bracket portion 12 of the cylinder head structure 1 as a whole. Preferably, the outer periphery of the bracket portion 12 can also be fixedly connected to the outer shell of the compressor to increase the stability of the transmission 2 inside the compressor, and further ensure the coaxiality of the crankshaft 4 on the pump body side, the power shaft 3 on the motor side and the transmission 2. Preferably, the transmission housing 24 and the bracket portion 12 are connected and fixed by bolts. The cylinder head body 11 is provided with an inner hole 13 which penetrates in the axial direction, and the inner hole 13 is for the crankshaft 4 to pass through, so that the crankshaft 4 can pass through the cylinder head body 11 and connect to the output end of the transmission 2 mounted on the bracket part 12, and the crankshaft 4 and the inner hole 13 are rotationally matched.

[0044] Therefore, the cylinder head structure 1 of this embodiment fixes the transmission 2 by adding a bracket portion 12 on the cylinder head body 11, and radially limits the crankshaft 4 passing therethrough and the output end of the transmission 2 fixedly connected to the crankshaft 4 by the inner hole 13 on the cylinder head body 11, so as to realize the direct fixing of the transmission 2 on the bracket portion 12 of the cylinder head structure 1. On the one hand, it can greatly reduce the difficulty of coaxially assembling the crankshaft 4 on the pump body side and the power shaft 3 on the motor side of the compressor with the transmission 2, and effectively improve the assembly coaxiality of the transmission 2 added in the compressor; on the other hand, there is no need to add additional connecting components to fix the transmission 2, thereby reducing the number of internal parts and assembly costs of the compressor, and can effectively reduce the overall axial length of the compressor, ensure the overall axial stability of the compressor, and improve the vibration, noise and lubrication state of the compressor.

[0045] In this embodiment, preferably, a journal 14 is extended on one side of the cylinder head body 11 away from the cylinder 6, the inner hole 13 axially penetrates the journal 14, and the bracket portion 12 is provided on the outer peripheral surface of the end of the journal 14 away from the cylinder head body 11. The crankshaft 4 passes through the cylinder head body 11 and the journal 14 through the inner hole 13 and is connected to the output end of the transmission 2. The extended journal 14 can strengthen the support for the crankshaft 4, increase the overall axial stability of the compressor, and also move the bearing supporting the output end of the transmission 2 inside the transmission 2 out of the transmission housing 24 and embed it into the inner hole 13 in the journal 14, thereby further reducing the overall axial length of the compressor.

[0046] See also Figure 3 In a preferred embodiment, the bracket portion 12 is connected to the journal 14 on the cylinder head body 11 by interference fit, that is, the bracket portion 12 is sleeved on the outer circumferential surface of the end of the journal 14 away from the cylinder head body 11 and is connected to the journal 14 by interference fit, thereby achieving a fixed connection between the bracket portion 12 and the journal 14 on the cylinder head body 11, which can ensure that the cylinder 6 and the crankshaft 4 connected to one side of the cylinder head body 11 and the transmission 2 connected to the bracket portion 12 on the other side of the cylinder head body 11 form good assembly coaxiality.

[0047] See also Figure 4 In another preferred embodiment, the bracket portion 12 and the cylinder head body 11 are an integrally designed integral part, forming an integrated cylinder head structure 1 with the bracket portion 12. The integrated cylinder head structure 1 simultaneously assumes the function of connecting the cylinder 6, the crankshaft 4 and the transmission 2, which can ensure that the cylinder 6 and the crankshaft 4 connected on both sides of the cylinder head structure 1 form a good assembly coaxiality with the transmission 2.

[0048] In other preferred embodiments, the bracket portion 12 is welded to the cylinder head body 11, which can also achieve fixed connection between the bracket portion 12 and the journal 14 on the cylinder head body 11, ensuring good assembly coaxiality between the cylinder 6 and the crankshaft 4 connected to one side of the cylinder head body 11 and the transmission 2 connected to the bracket portion 12 on the other side of the cylinder head body 11.

[0049] In this embodiment, see Figure 3 and Figure 4 Preferably, an oil groove 15 is provided on the wall of the inner hole 13 of the cylinder head body 11, which is used to fill lubricating oil between the inner hole 13 and the crankshaft 4. When the compressor is running, an oil film can be formed between the inner hole 13 and the crankshaft 4, which plays the role of a sliding bearing and enhances the rolling support of the crankshaft 4.

[0050] Based on the cylinder head structure 1 of the present invention, the embodiment of the present invention further provides a compressor with a transmission. The compressor with a transmission of this embodiment includes the cylinder head structure 1 of this embodiment.

[0051] Preferably, see Figure 1 and Figure 2 The compressor with a transmission in this embodiment also includes a motor, a pump body, a power shaft 3 driven to rotate by the motor, a crankshaft 4 inserted into the cylinder 6 of the pump body, and a transmission 2 connecting the power shaft 3 and the crankshaft 4. The input end and the output end of the transmission 2 are respectively connected to the power shaft 3 on the motor side of the compressor and the crankshaft 4 on the pump body side. The motor is the power source for the operation of the compressor. The power shaft 3 is inserted into the rotor 5 of the motor and is fixedly connected to the rotor 5, so that the rotor 5 of the motor drives the power shaft 3 to rotate synchronously. The pump body is the compression structure of the compressor. The pump body is provided with a cylinder 6, and the crankshaft 4 is inserted into the cylinder 6. The eccentric part of the crankshaft 4 drives the piston to make an eccentric movement inside the cylinder 6 to achieve compression of the working medium passed into the cylinder 6 of the pump body. The input end of the transmission 2 is connected to the power shaft 3 and rotates synchronously, and is used to receive the rotational torque from the power shaft 3. The output end of the transmission 2 is connected to the crankshaft 4 and rotates synchronously, and is used to output torque to the crankshaft 4 to drive the crankshaft 4 to operate. The input end and the output end of the transmission 2 are connected by a speed transmission mechanism, that is, the output speed of the output end is different from the input speed of the input end, so that the speed of the crankshaft 4 on the pump body side and the speed of the power shaft 3 on the motor side are different, which can realize the asynchronous operation of the motor and the pump body of the compressor. The cylinder head body 11 of the cylinder head structure 1 is connected and sealed to one end of the cylinder 6 close to the transmission 2 to form a closed pump body structure. The transmission 2 is connected to the bracket part 12 of the cylinder head structure 1 through the transmission housing 24 to realize the installation and fixation of the transmission 2 inside the compressor. Preferably, the transmission housing 24 and the bracket part 12 are connected and fixed by bolts. The crankshaft 4 passes through the inner hole 13 on the cylinder head body 11 and is connected to the output end of the transmission 2, and the crankshaft 4 and the inner hole 13 are rotationally matched.

[0052] In the present embodiment, preferably, the input end and the output end of the transmission 2 are connected by a reduction transmission mechanism, that is, the output speed of the output end is less than the input speed of the input end, so that the speed of the crankshaft 4 on the pump body side is less than the speed of the power shaft 3 on the motor side. In this way, the characteristics that the motor is more efficient at high speeds and the pump is more efficient at low speeds can be fully utilized, so that the motor and the pump body can work in their respective optimal efficiency ranges at the same time, thereby greatly improving the overall efficiency of the compressor.

[0053] In this embodiment, the form of the speed transmission mechanism of the transmission 2 is not limited. In a preferred embodiment, see Figure 2 The speed transmission mechanism of the transmission 2 adopts a planetary gear transmission mechanism, including a sun gear 21, a planetary gear 22, a planetary support 23, a transmission housing 24, and a gear ring disposed on the inner surface of the transmission housing 24. The speed transmission mechanism is integrally built into the transmission housing 24. One end of the sun gear 21 is the input end of the transmission 2, connected to the power shaft 3 and rotates synchronously. The other end of the sun gear 21 meshes with one side of the planetary gear 22, and the other side of the planetary gear 22 meshes with the gear ring disposed on the inner surface of the transmission housing 24. One end of the planetary support 23 is connected and fixed to the planetary gear 22 and keeps rotating synchronously, and the other end of the planetary support 23 is the output end of the transmission 2, connected to the crankshaft 4 and rotates synchronously. When the rotor 5 of the motor drives the power shaft 3 to rotate, the sun gear 21 rotates accordingly, and drives the planetary gear 22, the planetary support 23 and the crankshaft 4 to rotate. The sun gear 21 and the planetary gear 22 have gear teeth of different sizes, which can realize speed transmission, so that the crankshaft 4 and the power shaft 3 run asynchronously at different speeds.

[0054] 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 cylinder head structure of a compressor with a transmission, characterized in that: The input end and the output end of the transmission (2) are respectively connected to the power shaft (3) on the motor side of the compressor and the crankshaft (4) on the pump body side. The cylinder head structure (1) comprises a cylinder head body (11) and a bracket portion (12). One side of the cylinder head body (11) is used to connect and seal an end of the cylinder (6) of the pump body close to the transmission (2). The bracket portion (12) is fixed to the other side of the cylinder head body (11) and is used to connect the transmission (2). The cylinder head body (11) is provided with an inner hole (13) which penetrates along the axial direction, and the inner hole (13) is provided for the crankshaft (4) to pass through.

2. The cylinder head structure of the compressor with a transmission according to claim 1, characterized in that: A journal (14) extends from a side surface of the cylinder head body (11) away from the cylinder (6); the inner hole (13) penetrates the journal (14) in the axial direction; and the bracket portion (12) is arranged on the outer peripheral surface of one end of the journal (14) away from the cylinder head body (11).

3. The cylinder head structure of the compressor with a transmission according to claim 2, characterized in that: The bracket portion (12) is connected to the shaft neck (14) by interference fit.

4. The cylinder head structure of a compressor with a transmission according to claim 1 or 2, characterized in that: The bracket portion (12) is welded to the cylinder head body (11).

5. The cylinder head structure of a compressor with a transmission according to claim 1 or 2, characterized in that: The bracket part (12) and the cylinder head body (11) are an integral part designed in one piece.

6. The cylinder head structure of a compressor with a transmission according to claim 1, characterized in that: An oil groove (15) is provided on the hole wall of the inner hole (13).

7. The cylinder head structure of a compressor with a transmission according to claim 1, characterized in that: The bracket portion (12) is used to connect to a transmission housing (24) of the transmission (2).

8. A compressor with a transmission, characterized in that: A cylinder head structure (1) comprising a compressor with a transmission as claimed in any one of claims 1 to 7.

9. The compressor with a transmission according to claim 8, characterized in that: It also includes a motor, a pump body, a power shaft (3) driven to rotate by the motor, a crankshaft (4) inserted into a cylinder (6) of the pump body, and a transmission (2) connecting the power shaft (3) and the crankshaft (4); the cylinder head body (11) is connected to and seals one end of the cylinder (6) close to the transmission (2); the transmission (2) is connected to the bracket part (12) through a transmission housing (24); and the crankshaft (4) passes through the inner hole (13) and is connected to the output end of the transmission (2).

10. The compressor with a transmission according to claim 9, characterized in that: The transmission housing (24) is connected to the bracket portion (12) via bolts.

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