Crankshaft structure and crankshaft connecting rod assembly for reciprocating piston compressor

Abstract

The utility model discloses a crankshaft structure and a crankshaft connecting rod assembly for a reciprocating piston compressor, and relates to the technical field of reciprocating piston compressors, the crankshaft structure comprises a crankshaft body, the crankshaft body comprises a long shaft, a balance block and a short shaft which are connected in sequence, the crankshaft body is provided with an oil duct, and the outlet end of the oil duct penetrates through the outer circle face of the short shaft. A short shaft oil discharging groove connected with the outlet end of the oil channel is further formed in the outer circle face of the short shaft. The crankshaft not only can effectively solve the problem of temperature fluctuation of a refrigerating system caused by splashing of refrigerating machine oil at the short shaft end of the crankshaft of the reciprocating piston compressor, but also can be matched with a connecting rod with an oil hole to solve the problem of poor lubrication of a small end of the connecting rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to reciprocating piston compressor technical field, specifically, a kind of crankshaft structure and crankshaft connecting rod assembly for reciprocating piston compressor. BACKGROUND

[0002] Crankshaft plays a key role in reciprocating piston compressor, on the one hand, crankshaft pushes connecting rod and piston to convert mechanical energy into internal energy, on the other hand, crankshaft relies on its own rotary motion to pump the refrigeration oil at the bottom of compressor to a moving component for lubrication.

[0003] At present, because the big head side of connecting rod is directly connected with crankshaft short shaft, lubrication is sufficient, while the small head side of connecting rod relies on splash lubrication, which is prone to wear;Meanwhile, during the lubrication process, excessive refrigeration oil will enter the refrigeration system, not only causing large temperature fluctuations in the refrigeration system, but also causing the risk of liquid strike of compressor valve plate. Therefore, it is extremely important to control the oil circulation path of crankshaft for the temperature stability of connecting rod short shaft and refrigeration system.

[0004] Traditional crankshaft short shaft is of open structure, and refrigeration oil splashes from the upper end of short shaft to lubricate parts, which not only has poor lubrication effect on the small head of connecting rod, but also easily leads to excessive refrigeration oil entering the refrigeration cycle, causing temperature fluctuations and compressor liquid strike. Therefore, there is an urgent need for a crankshaft structure and crankshaft connecting rod assembly that can solve the lubrication problem of the small head of connecting rod and the problem of excessive refrigeration oil entering the refrigeration cycle caused by the splashing of refrigeration oil from the short shaft of crankshaft. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of crankshaft structure and crankshaft connecting rod assembly for reciprocating piston compressor, which not only can effectively solve the problem of temperature fluctuations in refrigeration system caused by the splashing of refrigeration oil from the short shaft end of crankshaft of reciprocating piston compressor, but also can solve the problem of poor lubrication of the small head of connecting rod by using connecting rod with oil hole at the same time.

[0006] To achieve the purpose of the utility model, the technical scheme adopted is as follows: a crankshaft structure for reciprocating piston compressor, comprising a crankshaft body, the crankshaft body comprises a long shaft, a balance block and a short shaft connected in sequence, an oil channel is formed in the crankshaft body, the outlet end of the oil channel penetrates the outer circular surface of the short shaft, and a short shaft oil discharge groove is formed in the outer circular surface of the short shaft and connected with the outlet end of the oil channel.

[0007] Further, the oil channel comprises an oil inlet section, a spiral section and an oil outlet section connected in sequence, the oil inlet section and the oil outlet section are both through-hole structures, and the spiral section is a long groove structure spirally arranged along the outer wall of the long shaft.

[0008] Further, the inlet end of the oil outlet section is located on the long shaft.

[0009] Furthermore, an exhaust port communicating with the oil inlet section is also provided on the outer wall of the long shaft.

[0010] Furthermore, the short shaft is provided with a counterweight hole that communicates with the oil passage. The opening of the counterweight hole extends through the end face of the short shaft, and an oil separator is installed at the opening of the counterweight hole to seal it.

[0011] Furthermore, the oil separator is fitted inside the counterweight hole, and the oil separator has a cap-like structure. The opening of the oil separator is aligned with the opening direction of the counterweight hole, and the inner radial direction of the oil separator gradually increases towards the opening direction of the counterweight hole.

[0012] Furthermore, the short shaft oil drain groove extends toward the balance block.

[0013] A crankshaft connecting rod assembly for a reciprocating piston compressor includes the crankshaft structure described above.

[0014] Furthermore, it also includes a connecting rod mounted on a short shaft, the connecting rod having a transverse oil hole connecting its two ends, and the inlet end of the transverse oil hole being connected to the outlet end of the oil passage.

[0015] The beneficial effects of this utility model are:

[0016] This invention, by having the oil passage outlet end penetrate the outer circular surface of the short shaft rather than its end face, ensures that the refrigerant oil entering the oil passage outlet end can only be discharged through the outer circular surface of the short shaft. This prevents the refrigerant oil entering the oil passage from splashing onto the small end of the connecting rod during crankshaft rotation, effectively solving the problem of temperature fluctuations in the refrigeration system caused by refrigerant oil splashing at the short shaft end of the reciprocating piston compressor crankshaft. Furthermore, the crankshaft provided by this invention can be used in conjunction with a connecting rod equipped with an oil hole, allowing the refrigerant oil discharged through the oil passage outlet end to enter the small end of the connecting rod through the oil hole, effectively solving the problem of poor lubrication at the small end of the connecting rod. Attached Figure Description

[0017] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0018] Figure 1 This is a front view of the crankshaft structure for a reciprocating piston compressor provided by this utility model;

[0019] Figure 2 This is a cross-sectional view of the crankshaft structure for a reciprocating piston compressor provided by this utility model;

[0020] Figure 3 This is a structural diagram of the crankshaft connecting rod assembly for a reciprocating piston compressor provided by the utility model.

[0021] The attached diagram shows the markings and corresponding component names:

[0022] 1. Crankshaft body; 2. Oil passage; 3. Oil separator; 4. Connecting rod;

[0023] 101. Long shaft; 102. Counterweight; 103. Short shaft; 104. Vent hole; 105. Lower oil outlet hole of long shaft; 106. Upper oil inlet hole of long shaft; 107. Oil outlet hole of short shaft; 108. Oil drain groove of short shaft; 109. Counterweight hole; 110. Annular groove

[0024] 201. Oil inlet section; 202. Spiral section; 203. Oil outlet section;

[0025] 401. Lateral oil hole. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0027] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 , Figure 2 As shown, this utility model provides a crankshaft structure for a reciprocating piston compressor, including a crankshaft body 1. The crankshaft body 1 includes a long shaft 101, a balance block 102, and a short shaft 103 connected in sequence, and the long shaft 101, balance block 102, and short shaft 103 are an integral structure. When the crankshaft body 1 is in use, the connecting rod 4 is mounted on the short shaft 103. An oil passage 2 is provided on the crankshaft body 1. The inlet end of the oil passage 2 passes through the end face of the long shaft 101 away from the balance block 102, and the outlet end of the oil passage 2 passes through the outer circular surface of the short shaft 103. When the connecting rod 4 with a transverse oil hole 401 is mounted on the short shaft 103, the outlet end of the oil passage 2 corresponds to the transverse oil hole 401 on the connecting rod 4, so that the refrigeration oil delivered through the outlet end of the oil passage 2 can enter the small end side of the connecting rod 4 through the transverse oil hole 401 on the connecting rod 4, so that the crankshaft body 1 can ensure the lubrication of the small end side of the connecting rod 4 when in use.

[0029] To ensure lubrication between the big end of connecting rod 4 and the short shaft 103, a short shaft oil drain groove 108 is provided on the outer circumference of the short shaft 103. One end of the short shaft oil drain groove 108 is connected to the outlet end of the oil passage 2. When the big end of connecting rod 4 is installed on the short shaft 103, the groove opening of the short shaft oil drain groove 108 is closed by the big end of connecting rod 4, and the short shaft oil drain groove 108 forms the oil passage 2. This allows part of the refrigeration oil delivered through the outlet end of the oil passage 2 to enter the small end of connecting rod 4 through the transverse oil hole 401 on connecting rod 4, and the other part to enter between the inner wall of the big end of connecting rod 4 and the outer wall of the short shaft 103 through the short shaft oil drain groove 108, thus lubricating the big end of connecting rod 4.

[0030] In this invention, the oil passage 2 includes an inlet section 201, a spiral section 202, and an outlet section 203 connected in sequence. The inlet section 201 and the spiral section 202 are both located on the long shaft 101. The inlet section 201 and the outlet section 203 are through-hole structures, while the spiral section 202 is a long groove structure spirally arranged along the outer wall of the long shaft 101. In the design of the inlet section 201, the central axis of the inlet section 201 is collinear with the central axis of the long shaft 101. The spiral section 202 is connected to the inlet section 201 via a lower outlet hole 105 on the long shaft, and the axial direction of the lower outlet hole 105 is consistent with the radial direction of the long shaft 101. In the design of the spiral section 202, the output end of the spiral section 202 is located at the end of the long shaft 101 closest to the balance block 102. In the design of the outlet section 203, the inlet end of the outlet section 203 is located on the long shaft 101. On 01, since the long shaft 101 and the short shaft 103 are eccentrically arranged, the central axis of the oil outlet section 203 is inclined. The inlet end of the oil outlet section 203 is connected to the spiral section 202 through the oil inlet hole 106 on the long shaft, and the outlet end of the oil outlet section 203 passes through the circumferential surface of the short shaft 103 through the oil outlet hole 107 on the short shaft. The axial direction of the oil inlet hole 106 on the long shaft is consistent with the radial direction of the long shaft 101, and the axial direction of the oil outlet hole 107 on the short shaft is consistent with the radial direction of the short shaft 103.

[0031] In this invention, in order to discharge the refrigerant gas mixed in the refrigeration oil when it flows through the oil passage 2, an exhaust port 104 is also provided on the long shaft 101. The inlet end of the exhaust port 104 is connected to the oil inlet section 201, and the outlet end of the exhaust port 104 penetrates the outer wall of the long shaft 101. Specifically, the axial direction of the exhaust port 104 is consistent with the radial direction of the long shaft 101. Of course, the axial direction of the exhaust port 104 can also be inclined to the axial direction of the long shaft 101.

[0032] In this utility model, in order to ensure the stability of the crankshaft body 1 during rotation, a counterweight hole 109 is also provided on the short shaft 103. The opening of the counterweight hole 109 is located on the end face of the short shaft 103, and the axial direction of the counterweight hole 109 is consistent with the axial direction of the short shaft 103. The bottom of the counterweight hole 109 is connected to the oil outlet section 203. The outlet end of the oil outlet section 203 is located on the side wall of the counterweight hole 109. However, in order to prevent the refrigeration oil from splashing out from the opening of the counterweight hole 109, an oil separator 3 is also installed inside the counterweight hole 109 to seal the opening of the counterweight hole 109. When installing the oil separator 3, it is necessary to ensure that it does not affect the connectivity of the oil outlet section 203.

[0033] To facilitate the installation of the oil separator 3 while preventing it from falling off, an annular groove 110 is provided inside the counterweight hole 109. The short shaft oil outlet hole 107 is located between the annular groove 110 and the bottom of the counterweight hole 109, and the oil separator 3 is secured within the annular groove 110 on all sides. Simultaneously, the oil separator 3 is designed in a cap shape, with the inner diameter of the oil separator 3 gradually increasing towards the opening of the counterweight hole 109. During installation, the opening of the oil separator 3 faces the opening of the counterweight hole 109, thus effectively separating the oil. The opening of plate 3 does not face the bottom of the counterweight hole 109. When the refrigeration oil enters the counterweight hole 109, the refrigeration oil acts on the back of the oil separator plate 3. The force of the refrigeration oil acting on the oil separator plate 3 will spread outward around the oil separator plate 3, thereby expanding the oil separator plate 3 outward and extending the edge of the oil separator plate 3 into the annular groove 110. Finally, the edge of the oil separator plate 3 is firmly locked in the annular groove 110, effectively preventing the crankshaft from coming off the counterweight hole 109 during use.

[0034] To make the installation of the oil separator 3 more convenient, the inner wall of the counterweight hole 109 has a conical surface that matches the outer wall of the oil separator 3. The conical surface is located on the side of the annular groove 110 near the bottom of the counterweight hole 109. When the oil separator 3 is installed, the conical surface can support the surface of the oil separator 3, preventing the edge of the oil separator 3 from detaching from the annular groove 110 due to excessive force during installation.

[0035] To ensure that the refrigeration oil delivered through the short shaft oil drain groove 108 is effectively distributed between the big end of the connecting rod 4 and the outer wall of the short shaft 103, the short shaft oil drain groove 108 extends towards the balance block 102. Of course, while ensuring lubrication between the big end of the connecting rod 4 and the outer wall of the short shaft 103, the extension direction of the short shaft oil drain groove 108 can also be adjusted. For example, two short shaft oil drain grooves 108 can be provided, extending towards both ends of the short shaft 103 respectively; alternatively, the short shaft oil drain groove 108 can be extended directly towards the circumference of the short shaft 103 to form an annular groove 110. Naturally, the specific design of the short shaft oil drain groove 108 can be selected according to actual conditions.

[0036] Based on the above, this utility model also provides a crankshaft connecting rod assembly for a reciprocating piston compressor, such as...Figure 3 As shown, the crankshaft connecting rod assembly includes not only the aforementioned crankshaft structure, but also a connecting rod 4 mounted on the short shaft 103. The connecting rod 4 has a transverse oil hole 401 extending along its length. The inlet end of the transverse oil hole 401 is connected to the oil outlet hole 107 of the short shaft, and the outlet end of the transverse oil hole 401 penetrates the inner circular surface of the small end side of the connecting rod 4. After the small end side of the connecting rod 4 is connected to the piston, the refrigeration oil delivered from the oil outlet hole 107 of the short shaft can enter the small end side of the connecting rod 4 through the transverse oil hole 401, thereby lubricating the small end side of the connecting rod 4.

[0037] Working principle: The motor rotor of the reciprocating piston compressor is mounted on the long shaft 101 of the crankshaft body 1. The motor stator drives the motor rotor to rotate, and the motor rotor drives the crankshaft body 1 to rotate. When the crankshaft body 1 rotates, it drives the connecting rod 4, which in turn pushes the piston to reciprocate, converting mechanical energy into internal energy.

[0038] During the rotation of the crankshaft body 1 driven by the motor rotor, the compressor refrigeration oil is pumped into the crankshaft body 1 through the oil inlet section 201 and discharged through the exhaust port 104, where the refrigerant gas mixed in the refrigeration oil is discharged. Then, it enters the spiral section 202 through the oil outlet port 105 under the long shaft to lubricate the crankshaft body 1 and the crankshaft bore of the machine base. After passing through the spiral section 202, the refrigeration oil enters the oil outlet section 203 through the oil inlet port 106 on the long shaft and enters the counterweight hole 109. However, due to the presence of the oil baffle plate 3 in the counterweight hole 109, the refrigeration oil entering the counterweight hole 109 will not splash out. Instead, it is sent out through the oil outlet port 107 of the short shaft, so that part of it enters the transverse oil hole 401 on the connecting rod 4 and enters the small end side of the connecting rod 4 through the transverse oil hole 401 on the connecting rod 4. The other part is discharged through the crankshaft short shaft oil drain groove 108.

[0039] In this invention, the presence of the oil separator 3 allows the refrigerant oil that originally splashed out from the end face of the short shaft 103 to circulate along a fixed path. This not only ensures sufficient lubrication of the small end side of the connecting rod 4, but also prevents the refrigerant oil that splashed out from the end face of the short shaft 103 from being drawn into the refrigeration system, thus avoiding adverse effects.

[0040] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A crankshaft structure for a reciprocating piston compressor, characterized in that, The crankshaft body (1) includes a long shaft (101), a balance block (102) and a short shaft (103) connected in sequence. An oil passage (2) is provided on the crankshaft body (1). The outlet end of the oil passage (2) passes through the outer circle of the short shaft (103). A short shaft oil drain groove (108) connected to the outlet end of the oil passage (2) is also provided on the outer circle of the short shaft (103).

2. The crankshaft structure for a reciprocating piston compressor according to claim 1, characterized in that, The oil passage (2) includes an oil inlet section (201), a spiral section (202) and an oil outlet section (203) connected in sequence. The oil inlet section (201) and the oil outlet section (203) are both through-hole structures, and the spiral section (202) is a long groove structure spirally arranged along the outer wall of the long axis (101).

3. The crankshaft structure for a reciprocating piston compressor according to claim 2, characterized in that, The inlet end of the oil outlet section (203) is located on the long shaft (101).

4. The crankshaft structure for a reciprocating piston compressor according to claim 2, characterized in that, The outer wall of the long shaft (101) is also provided with an exhaust hole (104) that communicates with the oil inlet section (201).

5. The crankshaft structure for a reciprocating piston compressor according to claim 2, characterized in that, The short shaft (103) is also provided with a counterweight hole (109) that communicates with the oil passage (2). The opening of the counterweight hole (109) penetrates the end face of the short shaft (103), and an oil separator (3) is installed at the opening of the counterweight hole (109) to seal it.

6. The crankshaft structure for a reciprocating piston compressor according to claim 5, characterized in that, The oil separator (3) is fitted inside the counterweight hole (109), and the oil separator (3) has a cap structure. The opening of the oil separator (3) is in the same direction as the opening of the counterweight hole (109), and the opening direction of the counterweight hole (109) in the inner radial direction of the oil separator (3) gradually increases.

7. The crankshaft structure for a reciprocating piston compressor according to claim 2, characterized in that, The short shaft oil drain groove (108) extends toward the balance block (102).

8. A crankshaft connecting rod assembly for a reciprocating piston compressor, comprising the crankshaft structure as described in any one of claims 1 to 7.

9. The crankshaft connecting rod assembly for a reciprocating piston compressor according to claim 8, characterized in that, It also includes a connecting rod (4) mounted on a short shaft (103), the connecting rod (4) having a transverse oil hole (401) connecting its two ends, and the inlet end of the transverse oil hole (401) being connected to the outlet end of the oil passage (2).

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