Symmetrical balance type reciprocating compressor multi-row crankcase
By adopting an integrally cast housing and mid-body structure in a high-power symmetrical balanced reciprocating compressor, the problem of insufficient crankcase rigidity is solved, more stable operation and higher processing accuracy are achieved, and mechanical vibration and noise are reduced.
Patent Information
- Application Number
- CN202422961206.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The crankcase structure of a high-power symmetrical balanced reciprocating compressor has insufficient rigidity under high load, resulting in increased mechanical vibration and noise, affecting the operating stability and efficiency of the compressor.
The box body and center body structure are integrally cast. The same number of center bodies are set on both side walls of the box body. The positive side wall and oblique side wall of the center body intersect with the crankshaft seat ribs respectively to form a symmetrical cylinder-piston structure. The alternating movement of the cylinder and piston reduces mechanical vibration. The center body and box body are cast as one to improve the structural rigidity and strength.
The symmetrical cylinder-piston structure and integral casting reduce mechanical vibration and noise, improve the operating stability and reliability of the compressor, ensure the movement accuracy of the crankshaft and piston, and enhance the rigidity and strength of the entire machine.
Smart Images
Figure CN223434455U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a reciprocating piston compressor, in particular to a crankcase structure of a symmetrical balanced reciprocating compressor. Background Art
[0002] High-power reciprocating compressors are widely used in natural gas gathering and transmission boosting, gas storage injection, and chemical and refining gas boosting. These reciprocating compressors can reach power levels of up to 10,000 kW and boost pressures of up to 90 MPa. Currently, most high-power reciprocating compressors use symmetrically balanced reciprocating piston compressors. Unlike ordinary reciprocating piston compressors, these compressors utilize a symmetrically balanced structure in their design, avoiding the imbalance issues of traditional piston compressors and reducing mechanical vibration. This makes them suitable for a wider range of applications.
[0003] A symmetrically balanced reciprocating piston compressor primarily consists of a crankcase, with the cylinder block mounted to the crankcase wall via a center section. A crankshaft-connecting rod mechanism is rotatably supported within the crankcase cavity, with the piston in the cylinder connected to the crankshaft via a connecting rod. Due to the sheer size of high-power compressors, including their enormous crankcases, the crankcase and center section employ a split structure, with the cylinder block and piston supported on the crankcase via the center section. In this high-power, low-speed, and heavy-load operating environment, this split structure significantly weakens the overall rigidity and structural strength of the compressor, hindering its smooth operation. In particular, the middle body used to support the cylinder block and piston is directly supported on the wall of the crankcase. During operation, the huge force of the compressed gas on the piston end is transmitted to the crankcase through the middle body wall plate, generating an additional bending moment on the crankcase wall, which not only causes the crankcase wall plate to bend and deform, but also causes the installation position of the middle body and cylinder block to shift, directly affecting the movement accuracy of the crankshaft and piston, affecting the operating efficiency of the compressor and the stability of the entire machine operation, and increasing the vibration and noise of the compressor. Utility Model Content
[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a symmetrical balanced reciprocating compressor multi-row crankcase with good overall rigidity and reasonable force.
[0005] In order to solve the above technical problems, the utility model provides a symmetrical balanced reciprocating compressor multi-row crankcase, including a case body and a middle body, wherein the middle body is arranged on the outer wall of the case body wall, and a plurality of crankshaft seat ribs are arranged in the case cavity of the case body, and the two side walls of the case body have the same number of middle bodies, and the case body, crankshaft seat ribs and middle body are cast as a whole; the middle body includes a middle body positive side wall and a middle body oblique side wall, and the middle body oblique side wall is obliquely arranged on the case wall of the case body, and each of the middle body positive side wall and the middle body oblique side wall corresponds to a crankshaft seat rib; the middle body positive side wall and the corresponding crankshaft seat rib are substantially on the same plane, and the middle body oblique side wall and the corresponding crankshaft seat rib intersect on the case wall of the case body.
[0006] In the above structure, since there are the same number of middle bodies on the two side walls of the box body, a symmetrical cylinder-piston structure can be formed. The alternating movement of the symmetrical cylinder pistons can achieve very smooth gas compression. This structure can reduce mechanical vibration and impact, improve the stability and reliability of operation, avoid the imbalance problem of the transmission piston compressor, and reduce mechanical vibration and power consumption; the box body and the middle body are cast as a whole, and a more stable structural stiffness and structural strength can be obtained, the assembly error of the box body and the middle body can be reduced, higher processing accuracy and position accuracy can be achieved, and the smooth operation of the compressor can be better guaranteed. Furthermore, since the positive side wall of the middle body and the oblique side wall of the middle body symmetrically arranged on the side wall of the box body each correspond to a crankshaft seat rib, that is, one end of the two ends of the same crankshaft seat rib intersects with the positive side wall of the middle body through the box body wall, and the other end of the crankshaft seat rib intersects with the oblique side wall of the middle body through the box body wall on the corresponding side, the force of the compressed gas borne by the cylinder pistons installed on both sides of the box body acts on the crankshaft seat rib from opposite directions, avoiding the additional bending moment caused by the huge gas compression force directly acting on the box wall. This structure ensures that the reaction force of the compressed gas will not generate a bending moment on the box wall, but instead is offset by each other through the crankshaft seat ribs, resulting in a more reasonable force, avoiding the adverse effect of compressed gas on the stability of the box structure, having better structural rigidity and stability, and being more suitable for high-power reciprocating compressors. Also, because the positive side wall of the middle body and the corresponding crankshaft seat rib are on the same plane, and the oblique side wall of the middle body on the other side and the corresponding crankshaft seat rib intersect on the box wall, the huge compression force generated by the cylinder piston only acts on the two ends of the crankshaft seat rib, and does not act on the box wall of the crankcase, nor does it cause bending of the box wall, and the box will not produce operation deformation, which not only ensures the movement accuracy of the crankshaft and piston, but also ensures the smooth operation of the compressor, effectively reducing the vibration and noise of the compressor.
[0007] In a preferred embodiment of the present invention, at least two middle bodies are provided on each side wall of the box body. This structure can form a crankcase with multiple rows of symmetrical middle bodies to increase the exhaust volume and exhaust pressure of the compressor.
[0008] In a preferred embodiment of the present invention, the oblique sidewalls of the central body, located on either side of the housing, are parallel to each other. The central body's positive sidewalls and the corresponding crankshaft seat ribs are coplanar, and this plane is perpendicular to the corresponding housing wall. This structure facilitates a symmetrical cylinder-piston structure, achieving a very smooth compression effect.
[0009] In a preferred embodiment of the present invention, the cross section of the housing is generally U-shaped; the crankshaft seats are provided on the crankshaft seat ribs, and the mounting axis of each crankshaft seat is aligned, facilitating the installation and smooth operation of the crankshaft.
[0010] In a preferred embodiment of the present invention, the middle body further comprises a middle body end wall, which is parallel to the box wall of the box body, and a cylinder flange is provided on the outer end surface of the middle body end wall, so as to achieve precise installation of the cylinder body.
[0011] In a preferred embodiment of the present invention, the middle body extends outward from the box wall, and the middle body's positive side wall is provided with a positive wall hole, and the middle body's oblique side wall is provided with an oblique wall hole, so as to facilitate observation and maintenance of the operating status of the crankcase body.
[0012] In a preferred embodiment of the present invention, the middle body further comprises a middle body end wall, and the middle body cavity formed by the middle body positive side wall, the middle body end wall and the middle body oblique side wall is connected to the box cavity of the box body, so as to facilitate the installation of the crankshaft and the connecting rod.
[0013] In a preferred embodiment of the present invention, the crankshaft seat ribs are perpendicular to the box wall of the box body, and a reinforcing rib is provided on the plate surface of the crankshaft seat ribs, thereby greatly enhancing the structural rigidity and strength of the crankcase body and the crankshaft seat ribs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The multi-row crankcase of the symmetrical balanced reciprocating compressor of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0015] Figure 1 This is a front view of a specific embodiment of a multi-row crankcase of a symmetrical balanced reciprocating compressor of the present invention;
[0016] Figure 2 yes Figure 1 A-A section view;
[0017] Figure 3 yes Figure 1 B-B cross-section diagram.
[0018] In the figure, 1 is the casing, 2 is the crankshaft seat rib, 3 is the crankshaft seat, 4 is the oblique side wall of the middle body, 5 is the end wall of the middle body, 6 is the positive side wall of the middle body, 7 is the oblique wall hole, 8 is the cylinder flange, 9 is the positive wall hole, and 10 is the middle body. DETAILED DESCRIPTION
[0019] like Figure 1 、 Figure 2 and Figure 3 The illustrated symmetrically balanced reciprocating compressor multi-row crankcase has a housing 1 comprising two parallel walls spaced longitudinally. Six crankshaft support ribs 2 are positioned between the two parallel walls. The crankshaft support ribs 2 at each end and the two walls form a housing cavity, within which four crankshaft support ribs 2 are further positioned. The housing 1 has a generally U-shaped vertical cross-section, with an upward-facing opening at the top of the cavity to facilitate crankshaft installation and maintenance.
[0020] Each crankshaft seat rib 2 is provided with a crankshaft seat 3, which is used to support the rotating crankshaft. The mounting axes of each crankshaft seat 3 are aligned. A central body 10 extending outward is provided on each side wall of the casing 1. In this embodiment, three central bodies 10 are provided on each side wall to mount the cylinder block. The number of central bodies 10 extending outward is the same on both sides of the casing 1. Two crankshaft journals are located between adjacent crankshaft seat ribs 2. Two connecting rods on these two crankshaft journals extend to the central body 10 on the corresponding side of the casing 1 wall, respectively. The casing 1 cavity and the central body 10 cavity are interconnected.
[0021] The casing wall, crankshaft seat rib 2 and middle body 10 of the casing 1 are cast as a whole through integral casting, thereby optimizing the structure of the casing, improving the integrity of the casing, and reducing the number of casing assembly parts, which is beneficial to improving the machining accuracy of the casing and the running stability of the compressor.
[0022] The center body 10, integrally cast on the housing 1, includes a center forward sidewall 6, a center end wall 5, and a center oblique sidewall 4. The center forward sidewall 6, the center end wall 5, the center oblique sidewall 4, the center upper wall, and the center bottom wall define a center chamber that intersects the housing cavity of the housing 1. On either side of the housing wall, the center forward sidewall 6 on one side and the center oblique sidewall 4 on the other side correspond to the same crankshaft seat rib 2. The center forward sidewall 6 and the corresponding crankshaft seat rib 2 lie on the same vertical plane, and this plane is perpendicular to the housing wall of the housing 1. At least the center forward sidewall 6 and the crankshaft seat rib 2 lie on two adjacent planes. The center oblique sidewall 4 and the housing wall of the housing 1 are arranged at an angle relative to each other, and the center oblique sidewall 4 intersects with the corresponding crankshaft seat rib 2 on the housing wall of the housing 1. The oblique sidewalls 4 of each central body are parallel to each other. This structure allows the force generated by the compressed gas on one central body 10 to be transmitted to the crankshaft seat rib 2 via the central body positive sidewall 6, while the force generated by the compressed gas on the other central body 10 is also transmitted to the crankshaft seat rib 2 via the central body oblique sidewall 4. On the one hand, the forces transmitted to the crankshaft seat rib 2 by the central body positive sidewall 6 and the central body oblique sidewall 4 are balanced and offset, reducing the adverse effects of the unbalanced force of the compressed gas on the case. On the other hand, the direction of the compressed gas force acting on the central body positive sidewall 6 and the central body oblique sidewall 4 avoids the case wall 1, thus preventing additional bending moment from being generated on the case wall.
[0023] Each crankshaft support rib 2 is perpendicular to the casing 1 wall surface and is equipped with reinforcing ribs to enhance the support strength and stability of the crankshaft support rib 2. A front wall hole 9 is provided in the center body's front side wall 6, and an oblique wall hole 7 is provided in the center body's oblique side wall 4 to form an inspection and observation window. A cylinder block flange 8 is provided on the outer end surface of the center body end wall 5 of the center body 10. The center body end wall 5 is parallel to the casing 1 wall and is used to mount the cylinder block.
[0024] The above examples only illustrate some preferred embodiments of the present invention. However, the present invention is not limited thereto and numerous modifications and variations are possible. For example, the crankcase is not limited to having three central bodies on each side wall to form a six-row crankcase. Alternatively, two, four, or even more central bodies may be provided on each side wall to form a multi-row crankcase. Such modifications and variations fall within the scope of protection of the present invention.
Claims
1. A symmetrical balanced reciprocating compressor multi-row crankcase, comprising a case body (1) and a middle body (10), wherein the middle body (10) is arranged on the outer side wall of the case body (1), and a plurality of crankshaft seat ribs (2) are arranged in the case cavity of the case body (1), characterized in that: The box body (1) has the same number of middle bodies (10) on both side walls, and the box body (1), the crankshaft seat rib (2) and the middle body (10) are cast as a whole; the middle body (10) includes a middle body positive side wall (6) and a middle body oblique side wall (4), and the middle body oblique side wall (4) is obliquely arranged on the box wall of the box body (1), and each of the middle body positive side wall (6) and the middle body oblique side wall (4) corresponds to a crankshaft seat rib (2); the middle body positive side wall (6) and the corresponding crankshaft seat rib (2) are substantially on the same plane, and the middle body oblique side wall (4) and the corresponding crankshaft seat rib (2) intersect on the box wall of the box body (1).
2. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: At least two middle bodies (10) are provided on each side wall of the box body (1).
3. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The oblique side walls (4) of the middle body located on the box walls on both sides of the box body (1) are parallel to each other.
4. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The middle body positive side wall (6) and the corresponding crankshaft seat rib (2) are located on the same plane, and the plane is perpendicular to the corresponding box wall surface on the box body (1).
5. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The cross section of the box body (1) is generally in a "U"-shaped structure; a crankshaft seat (3) is provided on the crankshaft seat rib (2), and the installation axis center lines of each crankshaft seat (3) are on the same straight line.
6. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The middle body (10) further comprises a middle body end wall (5), which is parallel to the box wall of the box body (1), and a cylinder flange (8) is provided on the outer end surface of the middle body end wall (5).
7. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The middle body (10) extends outward on the box wall of the box body (1), a positive wall hole (9) is provided on the positive side wall (6) of the middle body, and an oblique wall hole (7) is provided on the oblique side wall (4) of the middle body.
8. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The middle body (10) further comprises a middle body end wall (5); a middle body cavity formed by the middle body positive side wall (6), the middle body end wall (5) and the middle body oblique side wall (4) is in communication with the box cavity of the box body (1).
9. The multi-row crankcase of the symmetrical balanced reciprocating compressor according to claim 1, characterized in that: The crankshaft seat rib plate (2) is perpendicular to the box wall of the box body (1), and a reinforcing rib plate is provided on the plate surface of the crankshaft seat rib plate (2).