Direct-drive piston type compression device

Abstract

The utility model relates to a direct-drive piston type compression device. The direct-drive piston type compression device comprises a power assembly and a compression assembly. The power assembly comprises a power mechanism and an output shaft. The power mechanism is used for driving the output shaft to rotate around the axis. The compression assembly comprises a reciprocating body, a rolling piece, a piston and a cylinder body, the piston is arranged in the cylinder body, the rolling piece is embedded in the reciprocating body, and the reciprocating body is connected with the piston. The two ends of the output shaft are respectively connected with a shaft head, and are respectively linked with a reciprocating body through the shaft heads; wherein a guide groove is formed in the circumferential surface of the shaft head, the rolling piece located on the corresponding side is clamped in the guide groove, and the track of the guide groove is configured in the mode that when the shaft head rotates to enable the rolling piece to move along the guide groove, the reciprocating body drives the piston to conduct reciprocating compression in the cylinder body. According to the scheme, the control mode is simple and reliable, and the driving efficiency of the piston is effectively improved. In addition, the characteristic that the output shaft has two-end output is utilized, so that the design of simultaneous compression of double cylinders and double pistons is achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a direct-drive piston compression device. Background Art

[0002] A compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. Common compressors include crankshaft swing rod compressors, crank connecting rod compressors, or swash plate compressors. The above compressors drive the reciprocating motion of the piston through the swing of the crankshaft swing rod, crank connecting rod, swash plate and other structures, thereby achieving cyclic compression of the fluid in the cylinder.

[0003] However, the above compressor generally drives the piston by controlling the swing of the eccentric structure to drive the piston to reciprocate. This driving method is relatively inefficient, resulting in low working efficiency of the compressor. Summary of the invention

[0004] Based on this, it is necessary to provide a direct-drive piston compression device to address the problem of low working efficiency of the compressor.

[0005] A direct-drive piston compression device, comprising:

[0006] A power assembly, the power assembly comprising a power mechanism and an output shaft, the output shaft is connected to the power mechanism, and two ends of the output shaft extend toward two sides of the power mechanism respectively, and the power mechanism is used to drive the output shaft to rotate around its axis;

[0007] A compression assembly, the compression assembly comprising a reciprocating body, a rolling element, a piston and a cylinder body, the piston is arranged in the cylinder body, the rolling element is embedded in the reciprocating body, and the reciprocating body is connected to the piston;

[0008] The two ends of the output shaft are each connected to a shaft head, and are linked to the reciprocating body of the compression assembly through the shaft head; wherein the shaft head is provided with a guide groove along its circumferential surface, and the rolling element of the compression assembly located on the corresponding side is engaged in the guide groove, so that the shaft head is linked to the corresponding reciprocating body, and the trajectory of the guide groove is configured as follows: when the shaft head rotates to make the rolling element move along the guide groove, the reciprocating body drives the piston to reciprocate and compress in the cylinder body.

[0009] In one embodiment, the trajectory of the guide groove is a closed curve that surrounds the shaft head, and the closed curve trajectory of the guide groove has crests and troughs, and the crests and troughs are distributed on the circumferential surface of the shaft head at intervals around the axial direction of the shaft head.

[0010] In one embodiment, the piston has a first compression surface and a second compression surface that are opposite to each other, the first compression surface and an inner wall of one side of the cylinder body constitute a first working side, and the second compression surface and an inner wall of the other side of the cylinder body constitute a second working side, when the shaft head rotates to cause the rolling element to move along the guide groove, the reciprocating body drives the piston to alternately reciprocate and compress the first working side and the second working side.

[0011] In one embodiment, the direct-drive piston compression device also includes a first shell and a second shell, the first shell and the second shell are respectively connected to the two sides of the cylinder body, the first shell is provided with a first air inlet and a first air outlet, the second shell is provided with a second air inlet and a second air outlet, the first air inlet and the first air outlet are connected to the first working side, and the second air inlet and the second air outlet are connected to the second working side.

[0012] In one embodiment, the direct-drive piston compression device also includes a first valve plate and a second valve plate, the first valve plate is clamped between the first shell and the cylinder body, the second valve plate is clamped between the second shell and the cylinder body, the first valve plate is respectively provided with a first intake valve and a first outlet valve, the first intake port is connected to the first working side through the first intake valve, and the first outlet port is connected to the first working side through the first outlet valve; the second valve plate is respectively provided with a second intake valve and a second outlet valve, the second intake port is connected to the second working side through the second intake valve, and the second outlet port is connected to the second working side through the second outlet valve.

[0013] In one embodiment, the power assembly further includes two reduction mechanisms, and the two reduction mechanisms are respectively connected to two sides of the power mechanism.

[0014] In one embodiment, the power assembly further includes a first rolling bearing, a second rolling bearing, a first plane bearing and a second plane bearing, wherein the first rolling bearing and the first plane bearing are spaced apart on the output shaft on one side of the power mechanism, and the second rolling bearing and the second plane bearing are spaced apart on the output shaft on the other side of the power mechanism.

[0015] In one embodiment, the reciprocating body includes a connecting body and a nesting, the rolling element is embedded in the nesting, the connecting body is provided with a locking structure, and the direct-drive piston compression device also includes a connecting shaft, the connecting shaft is connected to the piston, and a connecting disk is provided at one end of the connecting shaft away from the piston, and the connecting disk is fixed to the locking structure.

[0016] In one embodiment, the connector is provided with a perforated structure, and the compression assembly further comprises a guide rod assembly, and the guide rod assembly is provided through the perforated structure.

[0017] In one embodiment, the direct-drive piston compression device includes a first heat dissipation mechanism, and the first heat dissipation mechanism is in contact with one side of the first housing;

[0018] And / or, the direct-drive piston compression device further includes a second heat dissipation mechanism, and the second heat dissipation mechanism is wrapped around the outer surface of the cylinder body.

[0019] The above-mentioned direct-drive piston compression device realizes the control of the rotation of the output shaft around the axis by the power mechanism through the mutually clamping arrangement of the shaft head and the rolling element, and converts it into the control of the reciprocating motion of the piston along the axis direction. This control method is simple and reliable, and effectively improves the driving efficiency of the piston. Furthermore, the piston is directly driven to reciprocate by rotating the output shaft around its axis. In this way, the characteristic of the output shaft having output at both ends can be utilized, and compression components are simultaneously arranged at both ends of the output shaft, thereby realizing the design of dual-cylinder dual-piston simultaneous compression, which helps to improve the working efficiency of the direct-drive piston compression device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a schematic structural diagram of a direct-drive piston compression device in one embodiment of the present application.

[0021] FIG. 2 is a top view of the direct-drive piston compression device shown in FIG. 1 .

[0022] FIG. 3 is a cross-sectional view of the direct-drive piston compression device shown in FIG. 2 at AA.

[0023] FIG. 4 is a schematic diagram of a portion of the structure of the direct-drive piston compression device shown in FIG. 1 , with the second housing omitted.

[0024] FIG. 5 is a schematic diagram of a portion of the structure of the direct-drive piston compression device shown in FIG. 4 , with the connector omitted.

[0025] FIG. 6 is a schematic diagram of a portion of the structure of the direct-drive piston compression device shown in FIG. 4 , with the third housing omitted.

[0026] FIG. 7 is an exploded view of a portion of the structure of the direct-drive piston compression device shown in FIG. 6 .

[0027] FIG. 8 is a schematic diagram of the structure of an output shaft in an embodiment of the present application.

[0028] Description of Figure Numbers

[0029] 10. Direct-drive piston compression device; 100. Power assembly; 110. Power mechanism; 120. Output shaft; 121. Shaft head; 121a. Guide groove; a1. Wave crest; a2. Wave trough; 130. Speed ​​reduction mechanism; 140. First rolling bearing assembly; 141. First rolling bearing; 142. Second rolling bearing; 150. First plane bearing assembly; 151. First plane bearing; 152. Second plane bearing; 200. Compression assembly; 200a. First compression assembly; 200b. Second compression assembly; 210. Reciprocating body; 211. Connecting body; 2111. Locking structure; 2112. Perforated structure; 212. Nesting; 220. Rolling element; 230. Piston; 230a , the first compression surface; 230b, the second compression surface; 240, the cylinder body; 240b, the second working side; 250, the guide rod assembly; 300, the first shell; 310, the first air inlet; 320, the first air outlet; 400, the second shell; 410, the second air inlet; 420, the second air outlet; 500, the first valve plate; 510, the first air inlet valve; 520, the first air outlet valve; 600, the second valve plate; 600a, the second air inlet hole; 600b, the second air outlet hole; 610, the second air inlet valve; 620, the second air outlet valve; 630, the second sealing member; 700, the third shell; 800, the connecting shaft; 810, the connecting plate; 900, the first heat dissipation mechanism; 1000, the second heat dissipation mechanism. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] Referring to Figures 1, 2 and 3, Figure 1 shows a schematic structural diagram of a direct-drive piston compression device 10 in an embodiment of the present application, Figure 2 is a top view of the direct-drive piston compression device 10 shown in Figure 1, and Figure 3 is a cross-sectional view of the direct-drive piston compression device 10 shown in Figure 2 at AA.

[0037] As shown in FIG3 , a direct-drive piston compression device 10 includes a power assembly 100 and a compression assembly 200. The power assembly 100 includes a power mechanism 110 and an output shaft 120, the output shaft 120 is connected to the power mechanism 110, and the two ends of the output shaft 120 extend toward the two sides of the power mechanism 110 respectively, and the power mechanism 110 is used to drive the output shaft 120 to rotate around its axis. The compression assembly 200 includes a reciprocating body 210, a rolling element 220, a piston 230 and a cylinder body 240, the piston 230 is arranged in the cylinder body 240, the rolling element 220 is embedded in the reciprocating body 210, and the reciprocating body 210 is connected to the piston 230. Specifically, as shown in FIG3 , the two ends of the output shaft 120 are each connected to a compression assembly 200, which are a first compression assembly 200a and a second compression assembly 200b respectively.

[0038] As shown in FIG5 , each end of the output shaft 120 is connected to a shaft head 121, and each of the two ends of the output shaft 120 is linked to a reciprocating body 210 of the compression assembly 200 through the shaft head 121; wherein the shaft head 121 is provided with a guide groove 121a along its circumferential surface, and the rolling element 220 of the compression assembly 200 located on the corresponding side is engaged with the guide groove 121a, so that the shaft head 121 is linked to the corresponding reciprocating body 210. The track of the guide groove 121a is configured such that when the shaft head 121 rotates to make the rolling element 220 move along the guide groove 121a, the reciprocating body 210 drives the piston 230 to reciprocate and compress in the cylinder body 240.

[0039] The above-mentioned direct-drive piston compression device 10, through the mutually engaged arrangement of the shaft head 121 and the rolling element 220, realizes the conversion of the control of the power mechanism 110 on the rotation of the output shaft 120 around the axis into the control of the reciprocating motion of the piston 230 along the axis direction. This control method is simple and reliable, and effectively improves the driving efficiency of the piston 230. Furthermore, the piston 230 is directly driven to reciprocate by the rotation of the output shaft 120 around its axis. In this way, the characteristic of the output shaft 120 having output at both ends can be utilized, and the compression assembly 200 is simultaneously arranged at both ends of the output shaft 120, thereby realizing the design of simultaneous compression of the dual-cylinder dual-piston 230, which helps to improve the working efficiency of the direct-drive piston compression device 10.

[0040] Specifically, the power mechanism 110 can be a motor, a hydraulic drive device, a pneumatic drive device, etc., as long as it can drive the output shaft 120 to rotate around its axis. Preferably, in some embodiments, the power mechanism 110 is a motor. The rolling element 220 can be a spherical ball. Since the rolling element 220 moves along the guide groove 121a of the shaft head 121 when the shaft head 121 rotates, the spherical ball of the rolling element 220 can reduce the friction between the rolling element 220 and the wall surface of the guide groove 121a, thereby improving the smoothness of the reciprocating motion of the reciprocating body 210 driven by the shaft head 121.

[0041] It should also be noted that the conventional crankshaft rocker compressor, crank-connecting rod compressor or swash plate compressor utilizes the reciprocating swing of its eccentric structure to realize the reciprocating motion control of the piston 230. This control method is inefficient and causes great damage to the vibration and friction of the structure. The present application provides a shaft head 121 at the end of the output shaft 120, and utilizes the guide groove 121a of the shaft head 121 to drive the reciprocating motion control method of the piston 230. It abandons the eccentric control method, simplifies the structure, and improves the convenience of control. In addition, compared with the conventional crankshaft rocker compressor, crank-connecting rod compressor or swash plate compressor, the present application realizes that the axial direction of the output shaft 120, the movement direction of the reciprocating body 210, and the compression direction of the piston 230 are kept consistent, which helps to reduce the vibration and friction damage between the structures and helps to improve the working reliability of the structure.

[0042] Continuing to refer to Figure 5, in some embodiments, the trajectory of the guide groove 121a is a closed curve that surrounds the shaft head 121, and the closed curve trajectory of the guide groove 121a has crests a1 and troughs a2, and the crests a1 and the troughs a2 are distributed on the circumferential surface of the shaft head 121 at intervals around the axial direction of the shaft head 121, so that the reciprocating body 210 can reciprocate along the axial direction of the shaft head 121 under the guidance of the crests a1 and the troughs a2.

[0043] Specifically, the number of the peaks a1 and the troughs a2 can be designed according to actual needs. For example, when the rotation speed of the shaft head 121 is constant, the number of the peaks a1 and the troughs a2 can be increased to increase the frequency of the reciprocating motion of the reciprocating body 210, thereby increasing the compression frequency of the piston 230. On the contrary, when the rotation speed of the shaft head 121 is constant, the number of the peaks a1 and the troughs a2 can be reduced to reduce the frequency of the reciprocating motion of the reciprocating body 210, thereby reducing the compression frequency of the piston 230.

[0044] As shown in Figure 5, in some embodiments, the number of peaks a1 and troughs a2 is set to 2, and the peaks a1 and troughs a2 are evenly distributed at 90 degrees around the axis of the shaft head 121. In this way, the reciprocating body 210 can reciprocate twice within one rotation of the shaft head 121, which not only ensures the rationality of the structural arrangement, but also improves the movement efficiency of the reciprocating body 210.

[0045] Furthermore, in some embodiments, the trajectories of the guide grooves 121a of the shaft heads 121 at both ends of the output shaft 120 are arranged in a mirror-symmetrical manner perpendicular to the mid-vertical plane of the output shaft 120, so that a pair of pistons 230 can move in opposite directions to each other, thereby helping to maintain the force balance on both sides of the direct-drive piston compression device 10, reduce the vibration of the direct-drive piston compression device 10 during operation, and improve the working stability of the direct-drive piston compression device 10.

[0046] In some embodiments, the piston 230 has a first compression surface 230a and a second compression surface 230b that are opposite to each other. The first compression surface 230a and an inner wall on one side of the cylinder body 240 constitute a first working side (not shown), and the second compression surface 230b and an inner wall on the other side of the cylinder body 240 constitute a second working side 240b. When the shaft head 121 rotates to cause the rolling element 220 to move along the guide groove 121a, the reciprocating body 210 drives the piston 230 to alternately reciprocate and compress the first working side and the second working side 240b.

[0047] It should be noted that the first working side and the second working side 240b refer to the compression chambers located on both sides of the piston 230. As shown in FIG3 , the piston 230 is completely in contact with the inner wall of one side of the cylinder body 240, and the volume of the first working side is zero, so only the second working side 240b is shown in FIG3 . It can be understood that when the piston 230 is completely in contact with the inner wall of the other side of the cylinder body 240, the volume of the second working side 240b is zero, and the volume of the first working side reaches the maximum.

[0048] In this embodiment, the piston 230 has a first compression surface 230a and a second compression surface 230b that are separated from each other, so that when the reciprocating body 210 drives the piston 230 to reciprocate, the first compression surface 230a and the second compression surface 230b can respectively perform compression work on the first working side and the second working side 240b, so that the piston 230 can perform compression work whether it is in the process of moving forward or backward, which helps to improve the working efficiency of the direct-drive piston compression device 10 and ensure the compression effect. In addition, compression assemblies 200 are provided at both ends of the output shaft 120 of the present application, so that the present application can achieve the compression work effect of two pistons 230 and four compression surfaces, ensuring the working efficiency of the direct-drive piston compression device 10.

[0049] Continuing with reference to Figures 1 and 3, in some embodiments, the direct-drive piston compression device 10 also includes a first shell 300 and a second shell 400, and the first shell 300 and the second shell 400 are respectively connected to the two sides of the cylinder body 240, the first shell 300 is provided with a first air inlet 310 and a first air outlet 320, the second shell 400 is provided with a second air inlet 410 and a second air outlet 420, the first air inlet 310 and the first air outlet 320 are connected to the first working side, and the second air inlet 410 and the second air outlet 420 are connected to the second working side 240b, thereby realizing independent air inlet and outlet of the first working side and independent air inlet and outlet of the second working side 240b.

[0050] Specifically, the second shell 400 serves as the air inlet and outlet of the second working side 240b on the one hand, and is used to install and protect the reciprocating body 210 and the rolling element 220 on the other hand, which helps to improve the overall structural compactness and structural integrity of the direct-drive piston compression device 10, thereby helping to reduce the volume of the direct-drive piston compression device 10 and improve the portability and applicability of the direct-drive piston compression device 10.

[0051] For ease of understanding, the air inlet and outlet process of the direct-drive piston compression device 10 shown in FIG3 is described below. It should be noted that FIG3 includes a first compression assembly 200a and a second compression assembly 200b. The present application will only describe the compression process of the first compression assembly 200a below. The compression process of the second compression assembly 200b is the same as that of the first compression assembly 200a, so it will not be described in detail.

[0052] Since in the direct-drive piston compression device 10 of the present application, the reciprocating body 210 can drive the piston 230 to alternately reciprocate and compress the first working side and the second working side 240b, the reciprocating motion of the piston 230 in the cylinder body 240 includes a process in which the first compression surface 230a compresses the left inner wall of the cylinder body 240, and a process in which the second compression surface 230b compresses the right inner wall of the cylinder body 240.

[0053] Specifically, from the perspective shown in FIG. 3 , when the piston 230 starts to compress to the left from the rightmost side of the cylinder 240 (the second compression surface 230b abuts against the right inner wall of the cylinder 240), the first air inlet 310 and the first air outlet 320 both remain closed, and the gas in the first working side is compressed as the piston 230 moves. As the piston 230 continues to compress to the left, the gas pressure in the first working side gradually increases, and the gas is eventually discharged through the first air outlet 320. In addition, during this process, the second air outlet 420 remains closed, and the second air inlet 410 remains open, and the compressed gas flows into the second working side 240b through the second air inlet 410.

[0054] When the first compression surface 230a of the piston 230 abuts against the leftmost inner wall of the cylinder body 240, the compression work process of the first working side ends, and the piston 230 starts to move to the right and compresses the second working side 240b.

[0055] When the piston 230 starts to compress rightward from the leftmost side of the cylinder 240 (the first compression surface 230a abuts the left inner wall of the cylinder 240), the second air inlet 410 and the second air outlet 420 are both kept closed, and the gas in the second working side 240b is compressed as the piston 230 moves. As the piston 230 continues to compress rightward, the gas pressure in the second working side 240b gradually increases, and the gas is eventually discharged through the second air outlet 420. In addition, during this process, the first air outlet 320 is kept closed, and the first air inlet 310 is kept open, and the compressed gas flows into the first working side through the first air inlet 310.

[0056] The above is a general process of the inlet and outlet of the direct-drive piston compression device 10, which can realize the bidirectional compression of the piston 230, which helps to improve the compression effect of the direct-drive piston compression device 10. Furthermore, since the compression assembly 200 is provided at both ends of the output shaft 120, the bidirectional compression of the piston 230 can be realized at both ends of the output shaft 120, which helps to further improve the compression effect of the direct-drive piston compression device 10.

[0057] Continuing to refer to FIG. 3 , in some embodiments, the direct-drive piston compression device 10 further includes a first valve plate 500 and a second valve plate 600. The first valve plate 500 is sandwiched between the first housing 300 and the cylinder body 240, and the second valve plate 600 is sandwiched between the second housing 400 and the cylinder body 240. The first valve plate 500 is respectively provided with a first intake valve 510 and a first outlet valve 520. The first intake port 310 is communicated with the first working side through the first intake valve 510, and the first outlet port 320 is communicated with the first working side through the first outlet valve 520. The second valve plate 600 is respectively provided with a second intake valve 610 and a second outlet valve 620. The second intake port 410 is communicated with the second working side 240b through the second intake valve 610, and the second outlet port 420 is communicated with the second working side 240b through the second outlet valve 620.

[0058] Specifically, the first valve plate 500 is opposite to the first compression surface 230a, and the second valve plate 600 is opposite to the second compression surface 230b. The first valve plate 500 and the second valve plate 600 are respectively used as sealing members between the first housing 300 and the cylinder body 240, and between the second housing 400 and the cylinder body 240. Therefore, in some embodiments, a first sealing member is provided on both sides of the first valve plate 500, and a second sealing member 630 is provided on both sides of the second valve plate 600 (as shown in conjunction with FIG. 4), which helps to improve the sealing performance of the direct-drive piston compression device 10 and ensure the sealing and high efficiency of the compression process of the piston 230.

[0059] As shown in FIG4 , in some embodiments, the second valve plate 600 is provided with a second air inlet 600a and a second air outlet 600b, and the second air inlet valve 610 and the second air outlet valve 620 can be connected to the second air inlet 600a and the second air outlet 600b, respectively. In addition, as shown in FIG4 , the second valve plate 600 is further provided with a second sealing member 630, which is beneficial to improve the air inlet and outlet sealing effect of the second valve plate 600, thereby ensuring the compression effect of the direct-drive piston compression device 10.

[0060] Similarly, the first valve plate 500 is provided with a first air inlet hole and a first air outlet hole, and the first air inlet valve 510 and the first air outlet valve 520 can be connected to the first air inlet hole and the first air outlet hole respectively. In addition, the first valve plate 500 is also provided with a first sealing member, which is beneficial to improve the sealing effect of the air inlet and outlet of the first valve plate 500, thereby ensuring the compression effect of the gas.

[0061] As shown in combination with FIG. 4 and FIG. 5 , in some embodiments, the reciprocating body 210 includes a connecting body 211 and a nesting 212, and the rolling element 220 is embedded in the nesting 212. In addition, as shown in combination with FIG. 3 to FIG. 5 , the connecting body 211 is provided with a locking structure 2111, and the direct-drive piston compression device 10 further includes a connecting shaft 800, which is connected to the piston 230, and a connecting disk 810 is provided at one end of the connecting shaft 800 away from the piston 230, and the connecting disk 810 is fixed to the locking structure 2111.

[0062] Specifically, the connecting body 211 and the nesting 212 can be integrally formed or bolted. The axis of the connecting shaft 800 is consistent with the movement direction of the connecting body 211, which helps to ensure the smoothness of the movement of the piston 230. In addition, the design of providing a connecting plate 810 at one end of the connecting shaft 800 helps to improve the connection stability between the connecting shaft 800 and the connecting body 211, and improve the working reliability of the direct-drive piston compression device 10.

[0063] As shown in FIG. 4 , in some embodiments, the connector 211 is provided with a perforated structure 2112 , and the compression assembly 200 further includes a guide rod assembly 250 , and the guide rod assembly 250 is provided through the perforated structure 2112 .

[0064] Specifically, the guide rod assembly 250 may include a first guide rod and a second guide rod that are inserted into both sides of the connecting body 211, which helps to improve the stability of the reciprocating motion of the reciprocating body 210. Understandably, in other embodiments, the guide rod assembly 250 may also include a third guide rod, a fourth guide rod, etc. The number of guide rods can be designed according to actual structural requirements. Specifically, a plurality of guide rods can be evenly distributed around the axis of the output shaft 120.

[0065] 4 , in some embodiments, the direct-drive piston compression device 10 further includes a third housing 700. The first guide rod is fixedly connected to the second housing 400 and the third housing 700, respectively, and both ends of the second guide rod are fixedly connected to the second housing 400 and the third housing 700, respectively.

[0066] As shown in FIG. 3 , in some embodiments, the power assembly 100 further includes two reduction mechanisms 130, which are respectively connected to the two sides of the power mechanism 110. The reduction mechanisms 130 are used to reduce the speed and increase the torque of the power mechanism 110, and transmit the torque to the shaft head 121 via the output shaft 120, so as to achieve reasonable transmission of the torque. Specifically, in this embodiment, the output shaft 120 is configured into two sections, and the two sections of the output shaft 120 are respectively connected to the reduction mechanisms 130 on the two sides of the power mechanism 110, and then connected to the shaft heads 121 on the two sides of the power mechanism 110.

[0067] Specifically, in this embodiment, the present application can directly assemble the power mechanism 110, the reduction mechanism 130 and the output shaft 120 with each other, thereby realizing the conversion of the rotation of the output shaft 120 into the reciprocating motion of the piston 230. Compared with the traditional control of the eccentric structure, the control method of the present application is more convenient. The installation can be completed by connecting the output end of the power mechanism 110 to the output shaft 120, thereby improving the assembly simplicity and structural connection reliability of the direct-drive piston compression device 10.

[0068] As shown in Figure 7, Figure 7 is an exploded view of a part of the structure of the direct-drive piston compression device 10 shown in Figure 6. In some embodiments, the reduction mechanism 130 is a planetary gear structure, the end of the output shaft 120 has a disc-shaped structure, and the disc-shaped structure is provided with a corresponding connection hole, and the planetary gear structure is inserted into the corresponding connection hole to achieve a fixed connection between the output shaft 120 and the planetary gear structure.

[0069] Referring to Fig. 8, in some embodiments, when the direct-drive piston compression device 10 is not equipped with a speed reduction mechanism 130, the output shaft 120 does not need to be configured as two sections. Therefore, in this embodiment, the output shaft 120 is in the shape of a continuous long shaft, and the two ends of the output shaft 120 are respectively connected to the shaft head 121, and the power mechanism 110 is used to be directly connected to the middle position of the output shaft 120 to directly drive the output shaft 120 to rotate around its axis.

[0070] Specifically, according to design requirements, such as torque requirements or overall device volume requirements, the present application can choose a solution with or without a reduction mechanism 130, thereby correspondingly selecting a configuration of the output shaft 120 in one of the above-mentioned embodiments, thereby meeting design requirements and improving the structural applicability of the direct-drive piston compression device 10.

[0071] As shown in FIG6 , in some embodiments, the power assembly 100 further includes a first rolling bearing assembly 140, a first plane bearing assembly 150, a second rolling bearing assembly (not shown) and a second plane bearing assembly (not shown). The first rolling bearing assembly 140 and the first plane bearing assembly 150 are sleeved on the output shaft 120 on one side of the power mechanism 110 at intervals, and the second rolling bearing assembly and the second plane bearing assembly are sleeved on the output shaft 120 on the other side of the power mechanism 110 at intervals (it should be noted that FIG6 only shows the bearing installation diagram on one side of the power mechanism 110, and the other side is symmetrically arranged, which will not be repeated here).

[0072] Specifically, as shown in FIG6 , the first rolling bearing assembly 140 includes a first rolling bearing 141 and a second rolling bearing 142; the first plane bearing assembly 150 includes a first plane bearing 151 and a second plane bearing 152. Similarly, the second rolling bearing assembly (not shown) also includes two rolling bearings; the second plane bearing assembly (not shown) also includes two plane bearings. Continuing with FIG6 , the first rolling bearing 141 and the second rolling bearing 142 are arranged at both ends of the output shaft 120 on one side, which helps to reduce the rotational friction of the output shaft 120. In addition, the first plane bearing 151 and the second plane bearing 152 are arranged between the first rolling bearing 141 and the second rolling bearing 142, which helps to improve the load-bearing effect on the output shaft 120, thereby improving the structural stability of the direct-drive piston compression device 10 and reducing the vibration effect of the rotation.

[0073] Referring again to FIG. 1 , in some embodiments, the direct-drive piston compression device 10 includes a first heat dissipation mechanism 900, which is fitted with one side of the first housing 300, so as to facilitate independent control of the first heat dissipation mechanism 900 and ensure the heat dissipation effect of the direct-drive piston compression device 10. In conjunction with FIG. 1 , in this embodiment, there are two first heat dissipation mechanisms 900, and the two first heat dissipation mechanisms 900 are respectively fitted with the side surfaces of the two first housings 300 on both sides.

[0074] Specifically, the heat dissipation mechanism of a conventional compressor is generally connected to the power mechanism 110, which will cause the heat dissipation mechanism to stop operating as the power mechanism 110 stops rotating, resulting in poor heat dissipation effect of the compressor. In this embodiment, the first heat dissipation mechanism 900 is attached to one side of the first housing 300, so that the first heat dissipation mechanism 900 and the power mechanism 110 are independently arranged, providing conditions for independent control of the first heat dissipation mechanism 900. More specifically, the first heat dissipation mechanism 900 can be connected to a power source (not shown), thereby realizing independent heat dissipation control of the first heat dissipation mechanism 900.

[0075] In some embodiments, the direct-drive piston compression device 10 further includes a second heat dissipation mechanism 1000, which is wrapped around the outer surface of the cylinder 240, thereby improving the heat dissipation effect of the cylinder 240. Specifically, the second heat dissipation mechanism 1000 may be composed of a plurality of heat dissipation fins, thereby being able to discharge the heat of the cylinder 240 in a timely manner.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A direct-drive piston compression device, characterized in that: include: A power assembly, the power assembly comprising a power mechanism and an output shaft, the output shaft is connected to the power mechanism, and two ends of the output shaft extend toward two sides of the power mechanism respectively, and the power mechanism is used to drive the output shaft to rotate around its axis; A compression assembly, the compression assembly comprising a reciprocating body, a rolling element, a piston and a cylinder body, the piston is arranged in the cylinder body, the rolling element is embedded in the reciprocating body, and the reciprocating body is connected to the piston; The two ends of the output shaft are each connected to a shaft head, and are linked to the reciprocating body of the compression assembly through the shaft head; wherein the shaft head is provided with a guide groove along its circumferential surface, and the rolling element of the compression assembly located on the corresponding side is engaged in the guide groove, so that the shaft head is linked to the corresponding reciprocating body, and the trajectory of the guide groove is configured as follows: when the shaft head rotates to make the rolling element move along the guide groove, the reciprocating body drives the piston to reciprocate and compress in the cylinder body.

2. The direct-drive piston compression device according to claim 1, characterized in that: The track of the guide groove is a closed curve that surrounds the shaft head, and the closed curve track of the guide groove has crests and troughs, and the crests and troughs are distributed on the circumferential surface of the shaft head at intervals around the axial direction of the shaft head.

3. The direct-drive piston compression device according to claim 1, characterized in that: The piston has a first compression surface and a second compression surface that are opposite to each other. The first compression surface and an inner wall of one side of the cylinder body constitute a first working side, and the second compression surface and an inner wall of the other side of the cylinder body constitute a second working side. When the shaft head rotates to cause the rolling element to move along the guide groove, the reciprocating body drives the piston to alternately reciprocate and compress the first working side and the second working side.

4. The direct-drive piston compression device according to claim 3, characterized in that: The direct-drive piston compression device also includes a first shell and a second shell, the first shell and the second shell are respectively connected to the two sides of the cylinder body, the first shell is provided with a first air inlet and a first air outlet, the second shell is provided with a second air inlet and a second air outlet, the first air inlet and the first air outlet are connected to the first working side, and the second air inlet and the second air outlet are connected to the second working side.

5. The direct-drive piston compression device according to claim 4, characterized in that: The direct-drive piston compression device also includes a first valve plate and a second valve plate, the first valve plate is clamped between the first shell and the cylinder body, the second valve plate is clamped between the second shell and the cylinder body, the first valve plate is respectively provided with a first intake valve and a first outlet valve, the first intake port is connected to the first working side through the first intake valve, and the first outlet port is connected to the first working side through the first outlet valve; the second valve plate is respectively provided with a second intake valve and a second outlet valve, the second intake port is connected to the second working side through the second intake valve, and the second outlet port is connected to the second working side through the second outlet valve.

6. The direct-drive piston compression device according to claim 1, characterized in that: The power assembly also includes two reduction mechanisms, and the two reduction mechanisms are respectively connected to two sides of the power mechanism.

7. The direct-drive piston compression device according to claim 1, characterized in that: The power assembly also includes a first rolling bearing, a second rolling bearing, a first plane bearing and a second plane bearing. The first rolling bearing and the first plane bearing are spaced apart on the output shaft on one side of the power mechanism, and the second rolling bearing and the second plane bearing are spaced apart on the output shaft on the other side of the power mechanism.

8. The direct-drive piston compression device according to claim 1, characterized in that: The reciprocating body includes a connecting body and a nesting, the rolling element is embedded in the nesting, the connecting body is provided with a locking structure, and the direct-drive piston compression device also includes a connecting shaft, the connecting shaft is connected to the piston, and a connecting disk is provided at one end of the connecting shaft away from the piston, and the connecting disk is fixed to the locking structure.

9. The direct-drive piston compression device according to claim 8, characterized in that: The connector is provided with a perforated structure, and the compression assembly further comprises a guide rod assembly, and the guide rod assembly is penetrated through the perforated structure.

10. The direct-drive piston compression device according to claim 4, characterized in that: The direct-drive piston compression device includes a first heat dissipation mechanism, and the first heat dissipation mechanism is in contact with one side of the first housing; And / or, the direct-drive piston compression device further includes a second heat dissipation mechanism, and the second heat dissipation mechanism is wrapped around the outer surface of the cylinder body.

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