Thermal expansion self-compensation structure assembly of vortex synchronous crank

Abstract

The utility model belongs to the field of mechanical fluid, and provides a vortex synchronous crank thermal expansion self-compensation structure assembly, which comprises a shell, an eccentric shaft, a vortex synchronous crank and a thermal expansion self-compensation structure, the static scroll plate is connected to the shell, the bottom end of the dynamic scroll plate is connected to the eccentric shaft, so that when the eccentric shaft rotates, the dynamic scroll plate can be driven to do eccentric motion relative to the shell, and the top end of the dynamic scroll plate is movably connected to the static scroll plate. Compared with the prior art, the scroll compressor has the advantages that the compensation groove is formed in the position, close to the crank bearing, of the movable scroll plate, so that the position can generate elastic deformation to a certain degree when being subjected to radial force, the problem of abnormal stress of the crank bearing caused by temperature difference is effectively solved, the risk of damage to the bearing is avoided, and the service life of the crank bearing is prolonged. The noise level in the machine operation is obviously reduced, the overall structure is simple, the bearing transition constraint state in the traditional design is eliminated, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of mechanical fluid, concretely relates to a vortex synchronous crank thermal expansion self-compensation structure assembly. BACKGROUND

[0002] The vortex compressor is a kind of volumetric compression compressor, and the compression component is composed of dynamic scroll disc and static scroll, which is widely applied to various industrial and civil equipment.

[0003] However, in actual use, due to the temperature difference of each part of the scroll pump, the temperature difference between the dynamic scroll disc and the shell is caused, and then the size change of the corresponding part of the crank is caused, which causes the abnormal stress of the crank, causes the damage of the crank bearing, the increase of noise, and even the failure of the machine.In addition, in the traditional design, the transition constraint state between the crank bearing and the crankshaft can cause the abnormal stress of the bearing due to the machining and assembly accuracy, which seriously affects the normal operation of the equipment. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a vortex synchronous crank thermal expansion self-compensation structure assembly with simple overall structure, high reliability, reduced noise and prolonged service life.

[0005] The utility model solves the technical problems by adopting the technical scheme of providing a vortex synchronous crank thermal expansion self-compensation structure assembly, which comprises: a shell, an eccentric shaft is arranged in the shell;

[0006] A static scroll disc and a dynamic scroll disc are arranged in the shell, the static scroll disc is connected to the shell, the bottom end of the dynamic scroll disc is connected to the eccentric shaft, so that the eccentric shaft can drive the dynamic scroll disc to make eccentric motion relative to the shell when the eccentric shaft rotates, and the top end of the dynamic scroll disc is movably connected to the static scroll disc;

[0007] A plurality of connecting parts are arranged at the circumference of the dynamic scroll disc in a ring shape and equidistantly, a plurality of cranks are arranged eccentrically in the shell, the cranks are arranged one by one corresponding to the connecting parts and are movably connected through crank bearings, and a compensation groove is arranged at the circumference of each connecting part in the dynamic scroll disc.

[0008] When the dynamic scroll disc makes eccentric motion relative to the static scroll disc, the compensation groove can be elastically deformed by the radial force of the eccentric rotation of the crank to absorb the error caused by temperature change or machining precision.

[0009] In the vortex synchronous crank thermal expansion self-compensation structure assembly, the compensation groove is arranged through in the axial direction of the dynamic scroll disc.

[0010] In the vortex synchronous crank heat expansion self-compensation structure assembly, the compensation groove comprises a circular arc part and an extension part, the circular arc part is convex in a direction away from the connecting part, and the extension part is symmetrically connected to two ends of the circular arc part and close to the circumference of the moving scroll.

[0011] In the vortex synchronous crank heat expansion self-compensation structure assembly, the distance between the ends of the two extension parts away from the circular arc part is greater than the outer diameter of the connecting part.

[0012] In the vortex synchronous crank heat expansion self-compensation structure assembly, the crank comprises a rotating part and a mounting part, the connecting part is provided with an assembly hole, the housing is provided with a first bearing, the rotating part is eccentrically arranged on the mounting part, the top end of the rotating part extends into the assembly hole and is movably connected through the crank bearing, the first bearing is connected to the mounting part, and the outer ring of the first bearing is in interference fit with the housing.

[0013] In the vortex synchronous crank heat expansion self-compensation structure assembly, the housing and the moving scroll are provided with a second bearing between the eccentric shaft.

[0014] In the vortex synchronous crank heat expansion self-compensation structure assembly, the eccentric shaft is provided with a counterweight at both ends.

[0015] In the vortex synchronous crank heat expansion self-compensation structure assembly, the counterweight is provided with a connecting hole, the eccentric shaft is provided with a locking hole, and when the connecting hole is aligned with the locking hole, the counterweight can be connected through a fastener to limit the rotation of the counterweight relative to the eccentric shaft.

[0016] In the vortex synchronous crank heat expansion self-compensation structure assembly, the static scroll is provided with a first threaded hole, the housing is provided with a sealing ring and a second threaded hole, and when the static scroll is pressed against the housing, the sealing ring is pressed, so that when the first threaded hole and the second threaded hole are aligned, the static scroll is fixedly connected through a connecting piece.

[0017] In the vortex synchronous crank heat expansion self-compensation structure assembly, the bottom wall of the static scroll further forms a limiting block, and the moving scroll is movably attached to the limiting block.

[0018] Compared with the prior art, the vortex synchronous crank heat expansion self-compensation structure assembly has the following beneficial effects:

[0019] (1) The utility model discloses a kind of vortex synchronous crank thermal expansion self-compensation structure assembly, by being provided with compensation groove in the dynamic scroll disc close to the installation of crank bearing, so that this part can produce certain degree of elastic deformation when being subjected to radial force, effectively solve the problem of abnormal stress of crank bearing caused by temperature difference, to avoid the risk of bearing damage, significantly reduce the noise level in machine operation, overall structure is simple, eliminate the bearing transition constraint state that appears in traditional design, prolong service life.

[0020] (2)By the mass distribution of two counterweights, the stability of the eccentric shaft during high-speed rotation is significantly improved, so that the scroll pump can better resist external interference and self-vibration during operation, improving the reliability and durability of the machine.

[0021] (3)The synergistic effect of the arc portion and the extension portion enables the compensation groove to produce uniform elastic deformation when subjected to radial force, effectively absorbing dimensional deviations, reducing the mismatch problem between mechanical components, and improving the stability and reliability of the equipment; At the same time, the tangential and axial rigidity of the dynamic scroll disc is sufficient to meet the phase requirement of the dynamic scroll disc during operation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the present application;

[0023] Figure 2 is Figure 1 a cross-sectional view of A-A in

[0024] Figure 3 is a schematic view of the installation structure of the dynamic scroll disc in the housing;

[0025] Figure 4 is a schematic view of the installation structure of the eccentric shaft, counterweight and dynamic scroll disc;

[0026] Figure 5 is an exploded view of the dynamic scroll disc and the static scroll disc.

[0027] In the figure, 1, housing; 10, eccentric shaft; 11, crank; 110, rotating portion; 111, mounting portion; 12, crank bearing; 13, first bearing; 14, second bearing; 15, counterweight; 150, connecting hole; 16, sealing ring; 17, second threaded hole; 18, connecting piece;

[0028] 2, static scroll disc; 20, first threaded hole; 21, limit block;

[0029] 3, dynamic scroll disc; 30, connecting portion; 300, assembly hole; 31, compensation groove; 310, arc portion; 311, extension portion. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] like Figures 1 to 5 As shown, this utility model discloses a self-compensating thermal expansion structure assembly for a scroll synchronous crank 11, comprising: a housing 1, inside which an eccentric shaft 10 is disposed; a stationary scroll 2 and a moving scroll 3, wherein the stationary scroll 2 is connected to the housing 1, and the bottom end of the moving scroll 3 is connected to the eccentric shaft 10, so that when the eccentric shaft 10 rotates, it can drive the moving scroll 3 to perform eccentric motion relative to the housing 1, and the top end of the moving scroll 3 is movably connected to the stationary scroll 2; and a plurality of connecting parts 30, which are distributed in a ring at equal intervals. At the periphery of the moving scroll plate 3, several cranks 11 are eccentrically arranged inside the housing 1. The cranks 11 are arranged one-to-one with the connecting parts 30 and are movably connected by crank bearings 12. The moving scroll plate 3 is also provided with a compensation groove 31 located at the periphery of each connecting part 30. When the moving scroll plate 3 moves eccentrically relative to the stationary scroll plate 2, the compensation groove 31 can be elastically deformed by the radial force of the cranks 11 rotating eccentrically, so as to absorb the error caused by temperature changes or machining accuracy.

[0033] When a vortex pump is working, it mainly relies on the translational moving vortex disk 3 and the fixed stationary vortex disk 2 to achieve continuous changes in gas volume. During this process, the moving vortex disk 3 inevitably generates a temperature difference with the casing 1, ultimately causing changes in the dimensional distribution of the crank 11 and crank bearing 12 connected to the connecting part 30. To solve the above technical problems, specifically, as follows... Figures 1 to 5As shown, when the eccentric shaft 10 is driven to rotate by the motor (which can be replaced by a stepper motor, a servo motor or other driving devices), the eccentric shaft 10 can drive the orbiting scroll 3 to move in the plane inside the fixed scroll 2 along the track of the fixed scroll 2. Under the mutual engagement (mutual restraint) of the two, the gas can be compressed along the gap between the two (the working principle can be referred to the scroll compressor in the prior art, which will not be described in detail here). During operation, the orbiting scroll 3 drives the crank 11 to eccentrically rotate through the connecting portion 30. Specifically, when the crank 11 exerts a radial force on the orbiting scroll 3 during eccentric rotation, the compensation groove 31 will correspondingly produce elastic deformation, thereby relieving the errors caused by temperature changes or machining precision. With the passage of time, the orbiting scroll 3 continuously performs eccentric motion, and the compensation groove 31 continuously functions to ensure that the dimensional deviations between the components are effectively compensated, avoiding abnormal stress on the crank 11 and ensuring normal operation of the equipment. As can be seen, the design of the compensation groove 31 enables the crank bearing 12 mounting portion on the orbiting scroll 3 to have radial compensation function, while the tangential and axial rigidity of the connecting portion 30 is sufficient to effectively meet the phase requirements of the orbiting scroll 3 during operation. At the same time, the compensation groove 31 eliminates the transitional constraint state between the crank bearing 12 and the crank 11, effectively preventing the crank bearing 12 from failing or being abnormally stressed, reducing machine noise and prolonging the service life of the equipment.

[0034] Preferably, as shown in Figure 2 and Figure 3 The compensation groove 31 in the present embodiment is provided in an axial direction through the orbiting scroll 3, which also enables the connecting portion 30 for mounting the crank bearing 12 to have sufficient elastic deformation to absorb the radial force, reducing the transitional constraint between the crank 11 and the crank bearing 12, reducing the risk of damage to the crank bearing 12. Furthermore, the axial through design optimizes the overall rigidity distribution of the orbiting scroll 3 (i.e. disperses stress), reduces unnecessary vibration and friction, reduces noise, and avoids local stress concentration.

[0035] The compensation groove 31 includes a circular arc portion 310 and an extension portion 311. The circular arc portion 310 protrudes in a direction away from the connecting portion 30. The extension portion 311 is symmetrically connected to both ends of the circular arc portion 310 and is close to the circumference of the orbiting scroll 3.

[0036] Further preferably, the compensation groove 31 in the present embodiment is composed of a circular arc portion 310 and an extension portion 311, wherein, as shown in Figure 3As shown, the arc part 310 is convex in the direction away from the connecting part 30, forming an elastic area, when the orbiting scroll 3 drives the crank 11 and the crank bearing 12 to move through the connecting part 30, the arc part 310 can absorb the radial stress through its convex shape, ensuring that the crank bearing 12 will not be damaged under normal stress, ensuring the stability of the machine during operation. The extension part 311 is symmetrically connected to the two ends of the arc part 310 and is close to the circumference of the orbiting scroll 3. The existence of the extension part 311 enhances the overall rigidity distribution of the compensation groove 31, ensuring that the entire connecting part 30 (including the crank 11 and the crank bearing 12) can effectively absorb stress towards the orbiting scroll 3, providing stable radial compensation function and relieving errors caused by temperature changes or machining precision.

[0037] Further preferably, each connecting part 30 in the embodiment is annularly arranged, by setting the distance between the ends of the two adjacent extension parts 311 away from the arc part 310 to be greater than the outer diameter of the connecting part 30. On the one hand, it ensures that the compensation groove 31 still has enough space for elastic deformation under extreme working conditions, greatly enhances the compensation ability of the compensation groove 31, effectively avoids the problem of compensation groove 31 failure caused by the limitation of the outer diameter of the connecting part 30, and improves the reliability of the structure. On the other hand, while ensuring the uniformity of the stress distribution of the entire orbiting scroll 3, it also provides convenience for the machining of the compensation groove 31, reducing production costs.

[0038] It should be noted that the shape of the compensation groove 31 in the embodiment is only used for illustration of the principle, and the shape and size of the compensation groove 31 can be specifically designed and calculated according to the stress size, temperature change and working condition requirements of different specific machine types (i.e. adaptive adjustments can be made). That is, the shape and size of the compensation groove 31 in the embodiment are not limited to this structure design method. Any slotting condition that adopts the principle falls within the protection scope of the embodiment.

[0039] The crank 11 includes a rotating part 110 and a mounting part 111, and the connecting part 30 is provided with an assembly hole 300. The housing 1 is provided with a first bearing 13, the rotating part 110 is eccentrically arranged on the mounting part 111, the top end of the rotating part 110 extends into the assembly hole 300 and is movably connected through the crank bearing 12; the first bearing 13 is connected to the mounting part 111, and the outer ring of the first bearing 13 is in interference fit with the housing 1.

[0040] As Figure 2As shown, the crank 11 in the embodiment is also composed of two parts, a rotating part 110 and a mounting part 111, wherein the mounting part 111 is installed in a centered manner with the first bearing 13, that is, the outer ring of the first bearing 13 is in interference fit with the housing 1, thereby improving the additional support force and effectively preventing the crank 11 from moving or loosening in the axial direction during operation, and ensuring the smoothness and stability of the rotating part 110 and the crank bearing 12 during operation. It is worth noting that the rotating part 110 in the embodiment is eccentrically arranged on the mounting part 111, and the rotating part 110 is connected to the crank bearing 12 through the assembly hole 300, which can keep the rotating part 110 stable during the eccentric movement of the moving scroll 3 and transmit power to the moving scroll 3. In this process, the crank bearing 12 also ensures the smooth rotation between the rotating part 110 and the moving scroll 3, reduces the friction and wear between parts, eliminates the problem of abnormal stress on the crank 11 caused by temperature changes and machining errors, significantly reduces the noise during machine operation, and also enables the machine to operate stably for a long time. Figure 2

[0041] Preferably, as shown in the figure, Figure 2 As shown, the housing 1 and the moving scroll 3 in the embodiment are both provided with a second bearing 14 between the eccentric shaft 10, which ensures the smooth operation of the entire device, enhances the rigidity distribution of the structure, reduces vibration and friction, optimizes the rotation cooperation between parts, effectively prevents the eccentric shaft 10 from moving or loosening during operation, and greatly reduces the risk of bearing damage. It should be noted that all bearings in the embodiment can be deep groove ball bearings, four-point contact bearings, and other bearings such as cylindrical roller bearings or needle bearings can be used instead under heavy load conditions.

[0042] Further preferably, the embodiment also provides a counterweight 15 at both ends of the eccentric shaft 10, and it is worth noting that the two counterweights 15 are also eccentrically arranged relative to the eccentric shaft 10, that is, the center positions of the two counterweights 15 are not on the same straight line as the axis of the eccentric shaft 10. Therefore, during mechanical movement, the counterweights 15 at both ends of the eccentric shaft 10 effectively balance the rotational inertia force of the eccentric shaft 10, ensuring the stable operation of the moving scroll 3 relative to the static scroll 2, reducing unnecessary vibration and friction, thereby reducing noise and ensuring the best performance of the machine under various working conditions.

[0043] The counterweight 15 is provided with a connecting hole 150, and the eccentric shaft 10 is provided with a locking hole. When the connecting hole 150 is aligned with the locking hole, it can be connected by a fastener to limit the rotation of the counterweight 15 relative to the eccentric shaft 10.

[0044] As shown in the figure, Figure 2 and Figure 4 ​As shown, the two counterweights 15 in the embodiment are connected in a detachable manner. Specifically, when the connecting holes 150 on the counterweights 15 are aligned with the locking holes (preferably threaded holes, not shown in the figure), a fastener can be used to pass through the connecting holes 150 and be connected to the locking holes. This mounting structure is relatively simple as a whole, while ensuring the synchronous operation between the counterweights 15 and the eccentric shaft 10, effectively avoiding the relative rotation between the two during operation, which affects the stability of the entire device. At the same time, this mounting method provides great convenience when the counterweights 15 need to be replaced or damaged, with lower maintenance costs and longer service life of the entire machine.

[0045] The static scroll 2 is provided with a first threaded hole 20, and the housing 1 is provided with a sealing ring 16 and a second threaded hole 17. When the static scroll 2 is pressed against the housing 1, the sealing ring 16 is compressed, so that the first threaded hole 20 and the second threaded hole 17 are aligned and fixedly connected by the connecting piece 18.

[0046] Similarly, as shown in Figure 1 and Figure 5 , when the static scroll 2 and the dynamic scroll 3 are engaged (i.e. movably connected), the static scroll 2 will also compress the sealing ring 16 when it is pressed against the housing 1, ensuring the sealing between the static scroll 2 and the housing 1, preventing fluid or gas leakage. At this time, the first threaded hole 20 and the second threaded hole 17 are in an aligned and interconnected state, and the static scroll 2 is fixed to the housing 1 by the connecting piece 18, ensuring firm connection between the two and improving the stability of the device during operation. It should be noted that the fastener and the connecting piece 18 in the embodiment can be replaced by other connecting pieces 30 such as screws.

[0047] As shown in Figure 1 , Figure 2 and Figure 5 , after the dynamic scroll 3 is accurately engaged with the static scroll 2, the limiting block 21 on the bottom wall of the static scroll 2 is in close contact with the dynamic scroll 3 (the end face provided with a compensation groove 31). That is, by installing the eccentric shaft 10 and the dynamic scroll 3, and cooperating with the limiting block 21 to guide and limit the movement range of the dynamic scroll 3, the displacement of the dynamic scroll 3 along the axis direction of the eccentric shaft 10 is effectively avoided, ensuring stable operation of the dynamic scroll 3 on the correct track and improving the assembly precision.

[0048] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A vortex synchronous crank thermal expansion self-compensation structure assembly, characterized in that, include: The housing has an eccentric shaft inside; A stationary scroll plate and a moving scroll plate are provided. The stationary scroll plate is connected to the housing, and the bottom end of the moving scroll plate is connected to the eccentric shaft, so that when the eccentric shaft rotates, it can drive the moving scroll plate to make an eccentric motion relative to the housing. The top end of the moving scroll plate is movably connected to the stationary scroll plate. Several connecting parts are distributed in a ring at equal intervals around the periphery of the moving scroll disk. Several cranks are eccentrically arranged inside the housing. The cranks are arranged one-to-one with the connecting parts and are movably connected by crank bearings. Compensation grooves are also opened in the moving scroll disk at the periphery of each connecting part. When the moving scroll plate moves eccentrically relative to the stationary scroll plate, the compensation groove can be elastically deformed by the radial force of the crank rotating eccentrically, so as to absorb the error caused by temperature changes or machining accuracy.

2. A vortex synchronous crank thermal expansion self-compensation structure assembly according to claim 1, characterized in that, The compensation groove is provided through the axial direction of the moving scroll disk.

3. A vortex synchronous crank thermal expansion self-compensation structure assembly according to claim 1, characterized in that, The compensation groove includes an arc portion and an extension portion. The arc portion protrudes in a direction away from the connecting portion. The extension portion is symmetrically connected to both ends of the arc portion and is close to the circumference of the moving vortex disk.

4. A thermal expansion self-compensating structure assembly of a scroll synchronization crank according to claim 3, characterized in that, The distance between the ends of two adjacent extensions that are far from the arc portion is greater than the outer diameter of the connecting portion.

5. A vortex synchronous crank thermal expansion self-compensation structure assembly according to claim 1, characterized in that, The crank includes a rotating part and a mounting part. An assembly hole is provided in the connecting part. A first bearing is provided in the housing. The rotating part is eccentrically mounted on the mounting part. The top end of the rotating part extends into the assembly hole and is movably connected through the crank bearing. The first bearing is connected to the mounting part, and the outer ring of the first bearing is interference-fitted with the housing.

6. A vortex synchronous crank thermal expansion self-compensation structure assembly according to claim 1, characterized in that, Both the housing and the moving scroll are provided with a second bearing between themselves and the eccentric shaft.

7. A vortex synchronous crank thermal expansion self-compensation structure assembly according to claim 1, characterized in that, Counterweights are provided at both ends of the eccentric shaft.

8. A vortex synchronous crank thermal expansion self-compensation structure assembly according to claim 7, characterized in that, Each counterweight has a connecting hole, and the eccentric shaft has a locking hole. When the connecting hole and the locking hole are aligned, they can be connected by fasteners to restrict the rotation of the counterweight relative to the eccentric shaft.

9. A vortex synchronous crank thermal expansion self-compensating structure assembly according to claim 1, characterized in that, The stationary vortex disk has a first threaded hole, and the housing has a sealing ring and a second threaded hole. The stationary vortex disk can press the sealing ring when it is pressed against the housing, so that the first threaded hole and the second threaded hole can be fixedly connected by a connector when they are aligned.

10. A thermal expansion self-compensated structure assembly of a scroll synchronization crank according to claim 1 or 9, characterized in that, The bottom wall of the stationary vortex disk is also formed with a limiting block, and the moving vortex disk moves and fits tightly against the limiting block.

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