Reciprocating piston compressor

Abstract

The invention relates to the field of compressors, in particular to a reciprocating piston compressor. A piston rod of the reciprocating piston compressor is provided with rack structures and driving gears, each driving gear comprises a smooth tooth section and a toothed section, the number of the driving gears is at least two, and / or the number of the rack structures is at least two. The first transmission mechanism and the second transmission mechanism are used for driving the piston rods and enabling the piston rods to move in opposite directions, so that the driving gear drives the piston rods to alternately reciprocate in the one-way rotation process. The driving gears form intermittent driving on the piston rod through the smooth tooth sections and the toothed sections, and two groups of transmission mechanisms are formed through at least two driving gears or at least two rack structures; and the driving directions of the two groups of transmission mechanisms to the piston rod are opposite, so that the problem of high power source control difficulty caused by frequent reversing of a power source due to the fact that the piston rod is driven by a single complete gear in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a reciprocating piston compressor. Background Art

[0002] A reciprocating piston compressor is a type of air compressor that compresses air through the movement of a piston within a cylinder. In the prior art, a combination of a crank - connecting rod structure and a piston is often used to achieve this, where the circular motion of the crank drives the piston to perform a reciprocating linear motion. During the circular motion of the crank, the center of gravity of the structure changes, causing the center of gravity to reciprocate up and down, which in turn leads to significant vibrations in the compressor.

[0003] There are also other forms of drive methods in the prior art. For example, the Chinese patent application for invention with the publication number CN113898553A discloses a swinging piston - type hydrogen compression cylinder and a hydrogen compression system. In this system, a gear shaft driven by a hydraulic motor is arranged within a housing. A driving gear is formed on the gear shaft, and a piston rod with a rack structure is meshed and driven on the outer peripheral surface of the driving gear. A piston is provided at the end of the piston rod, and the piston is nested within a cylinder sleeve (i.e., the cylinder block). By the rotation of the hydraulic motor, the movement of the piston rod can be driven, and thus the piston compresses the gas within the cylinder sleeve. To improve the compression efficiency, a first piston and a second piston are provided at both ends of the piston rod. When the first piston compresses air within the cylinder body, the second piston does not perform work within the cylinder body, enabling air intake within the cylinder sleeve. Then, the cylinder sleeve where the first piston is located intakes air, and the second piston compresses air within the cylinder sleeve.

[0004] However, in the above - mentioned technical solution, the piston needs to reciprocate, and the piston rod is driven by a complete driving gear, and the driving gear and the rack structure on the piston rod are always in mesh. When the piston rod needs to achieve a reciprocating motion with opposite directions, the driving gear needs to switch the rotation direction, that is, the gear shaft needs to frequently switch the motion direction, resulting in a problem of high difficulty in controlling the power source due to the frequent switching of the power source direction. Summary of the Invention

[0005] The purpose of the present invention is to provide a reciprocating piston compressor to solve the problem in the prior art that the piston rod is driven by a single complete gear, resulting in the need for frequent commutation of the power source and thus causing high difficulty in controlling the power source.

[0006] To achieve the above - mentioned purpose, the reciprocating piston compressor in the present invention adopts the following technical solutions:

[0007] A reciprocating piston compressor includes a piston rod, on which a rack structure is provided. The reciprocating piston compressor further includes a driving gear meshing with the rack structure on the piston rod. The driving gear includes a smooth tooth section and a toothed section, so that the driving gear has a meshing state and a free state with the rack structure during rotation; the driving gear includes at least two and / or the rack structure includes at least two, so that the driving gear and the rack structure form a first transmission mechanism and a second transmission mechanism for driving the piston rod to move forward and backward. When one of the first transmission mechanism and the second transmission mechanism is in a meshing state, the other is in a free state, so that the driving gear drives the piston rod to move forward and backward alternately during one-way rotation.

[0008] The beneficial effects of the above technical solution are as follows: The present invention improves the existing reciprocating piston compressor. By forming a smooth tooth section and a toothed section on the driving gear, there are a meshing state and a free state with the rack structure during rotation, so that the driving gear intermittently drives the piston rod. By including at least two driving gears and / or at least two rack structures, two transmission mechanisms are formed, and the driving directions of the two transmission mechanisms for the piston rod are opposite; since the driving gear is an incomplete gear, during rotation, one of the two transmission mechanisms is in a meshing state and the other is in a free state, so that the two transmission mechanisms alternately drive the piston rod, so that when the rotation direction of the driving gear remains unchanged, the movement direction of the piston rod reciprocates, thus solving the problem in the prior art that the piston rod is driven by a single complete gear, resulting in the need for frequent commutation of the power source and thus causing great difficulty in controlling the power source.

[0009] Further, the rack structure includes a first rack structure and a second rack structure independently arranged on the outer side surface of the piston rod. The driving gear includes a first driving gear and a second driving gear, wherein the first rack structure meshes with the first driving gear, and the second rack structure meshes with the second driving gear.

[0010] The beneficial effects of the above technical solution are as follows: It is convenient to better form two transmission mechanisms, and both the driving gear and the rack structure are independently arranged, so that the teeth on the rack and the driving gear are only subjected to a unidirectional force, which is convenient for improving the durability of the teeth.

[0011] Further, the first rack structure and the second rack structure are arranged at intervals around the outer circumference of the piston rod.

[0012] The beneficial effects of the above technical solution are as follows: It is convenient to save the installation space by arranging it on the outer circumference of the piston rod.

[0013] Further, the first rack structure and the second rack structure are arranged back to back, and the first driving gear and the second driving gear are respectively arranged on opposite sides of the piston rod.

[0014] The beneficial effect of the above technical solution is that the drive gears are also arranged relatively by the relative arrangement of the racks, thereby saving axial space.

[0015] Further, the first driving gear and the second driving gear are arranged symmetrically about the axis of the piston rod.

[0016] The beneficial effect of the above technical solution is that the symmetrically arranged driving gears make the piston rod more evenly stressed and provide a better driving effect on the piston rod.

[0017] Furthermore, the first rack structure and the second rack structure are symmetrically arranged with respect to the axis of the piston rod.

[0018] The beneficial effects of the above technical solution are: the rack structure is symmetrically arranged, which is easy to process and manufacture, and during the installation process, there is no need to distinguish the direction of the piston rod, which makes the installation easier.

[0019] Furthermore, a first driving shaft is arranged on the first driving gear, and a second driving shaft is arranged on the second driving gear. The ends of the first driving shaft and the second driving shaft away from the driving gear are matched through a belt, a chain or a gear structure transmission so that they rotate synchronously.

[0020] The beneficial effect of the above technical solution is that the two driving gears have good synchronization through belts, chains or gears, and the two driving gears are linked. At this time, only one power source can be set to control the two driving gears at the same time, which can reduce the use of power sources.

[0021] Furthermore, the reciprocating piston compressor further comprises a cylinder body nested with the piston, wherein the cylinder body comprises a cylinder body body and a wear-resistant sleeve in direct contact with the piston.

[0022] The beneficial effects of the above technical solution are: it is easy to protect the cylinder body and can be easily replaced after wear and tear in the later stage.

[0023] Furthermore, the reciprocating piston compressor also includes a cylinder body nested with the piston, the piston has two pistons, and the two pistons are respectively arranged at both ends of the piston rod. The cylinder body is provided with two air inlets and two air outlets corresponding to the two pistons respectively, the two air inlets are connected through an air intake channel, and the two air outlets are connected through an exhaust channel.

[0024] The beneficial effects of the above technical solution are: the compression efficiency of the two pistons is higher, and compression can be performed at both ends during the reciprocating motion; and through the arrangement of the intake channel and the exhaust channel, it is convenient to further save space.

[0025] Furthermore, the intake passage and the exhaust passage are both arranged on the cylinder body.

[0026] The beneficial effects of the above technical solution are as follows: it is convenient to ease the intake and exhaust, and the formation on the cylinder block avoids the reuse of additional pipelines, simplifying the use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of an embodiment of a reciprocating piston compressor in the present invention;

[0028] Figure 2 It is a schematic external structural diagram of an embodiment of a reciprocating piston compressor in the present invention;

[0029] Figure 3 It is a schematic side view of a wear-resistant sleeve and a piston in an embodiment of a reciprocating piston compressor in the present invention.

[0030] In the figure: 11, the first driving gear; 12, the second driving gear; 13, the piston rod; 14, the first rack structure; 15, the second rack structure; 16, the support column; 17, the first pulley; 18, the second pulley; 19, the belt; 21, the piston plate; 22, the bottom plate; 23, the connecting seat; 24, the wear-resistant sleeve; 25, the limit baffle; 26, the cylinder block body; 27, the intake check valve; 28, the exhaust check valve; 31, the intake buffer tank; 32, the exhaust buffer tank; 33, the intake passage; 34, the exhaust passage; 35, the housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0032] In the present invention, by setting the driving gear as an incomplete gear, an intermittent drive can be generated when meshing with the rack structure, and since the driving gear and the rack structure are set as two groups, the piston rod can be driven alternately. Then, a reciprocating motion can be generated for the piston rod without changing the rotation direction of the driving gear, and thus the power source does not need to change direction either.

[0033] In Embodiment 1 of the reciprocating piston compressor in the present invention:

[0034] Such as Figure 1As shown, in this embodiment, the reciprocating piston compressor is provided with a housing 35. An inner part of the housing 35 forms a cylinder body that is nested and fitted with the piston. A piston rod 13 and a piston at the end of the piston rod are arranged in the cylinder body. The piston and the cylinder body are used to compress gas during the reciprocating motion of the piston. A rack structure is arranged on the piston rod 13. In addition, the reciprocating piston compressor further includes a driving gear that meshes with the rack structure to drive the reciprocating motion of the piston rod 13. The driving gear and the rack structure mesh to form a transmission mechanism. In this embodiment, the driving gear includes a first driving gear 11 and a second driving gear 12 arranged on the side of the piston rod 13. The rack structure includes a first rack structure 14 and a second rack structure 15 independently arranged on the piston rod 13, thereby forming two sets of transmission mechanisms. Of course, in other embodiments, one driving gear can be provided and two rack structures can be respectively arranged on both sides of the driving gear. Or in other embodiments, two driving gears can be provided and only one rack structure can be arranged. The two driving gears are located on the same side of the rack structure and have opposite helix directions. Of course, in other embodiments, the driving gears or the rack structures can also be arranged in multiples, so that the torque distributed on each gear is reduced. The following description is given by taking the example that there are two driving gears and two rack structures.

[0035] As Figure 1 shown, there are two driving gears, namely a first driving gear 11 and a second driving gear 12. Both of the two driving gears include a smooth tooth section and a toothed section. Due to the existence of the smooth tooth section and the toothed section, the driving gear has a meshing state and a free state relative to the piston rod 13. When the first driving gear 11 meshes with the piston rod 13, the second driving gear 12 is in the free state. When the second driving gear 12 meshes with the piston rod 13, the first driving gear 11 is in the free state, so that the two driving gears alternately drive the piston rod 13 to move. One of the first driving gear 11 and the second driving gear 12 is used to drive the piston rod 13 to move forward, and the other is used to drive the piston rod 13 to move backward. Therefore, during the process of driving the piston rod 13 to move, the two driving gears move in opposite directions. That is to say, through the arrangement of the first driving gear 11 and the second driving gear 12, the piston rod 13 does not need to switch the rotation direction of the power source during the reciprocating movement, which is convenient for simplifying the requirements for the power source.

[0036] The positions of the rack structures correspond to those of the driving gears. The driving gears are arranged inside the cylinder block, and the piston rod 13 is arranged in the middle of the cylinder block. To facilitate a more balanced arrangement of the driving gears inside the cylinder block, the first rack structure 14 and the second rack structure 15 are respectively arranged on different outer circumferences of the piston rod 13. Specifically, in this embodiment, the first rack structure 14 and the second rack structure 15 are symmetrically arranged on both sides of the axis of the piston rod 13 and extend along the axis of the piston rod. Therefore, for the first driving gear 11 and the second driving gear 12 to better drive the rack structures, the first driving gear 11 and the second driving gear 12 are respectively arranged on both sides of the piston rod 13 and are symmetrically arranged with respect to the axis of the piston rod 13. The first rack structure 14 and the second rack structure 15 are symmetrically arranged with respect to the axis of the piston rod 13, so that the acting force positions of the two driving gears on the piston rod 13 are symmetric with respect to the axis of the piston rod 13, facilitating uniform stress on the piston rod 13. At this time, during forward movement, the movement end point of the first driving gear 11 and the movement start point of the second driving gear 12 are located in the middle. During reverse movement, the movement start point of the first driving gear 11 and the movement end point of the second driving gear 12 are located in the middle. That is to say, there are teeth on the first rack structure 14 and the second rack structure 15 that cannot be utilized. Therefore, the number of teeth on each rack structure is equal to the sum of the number of teeth of the first driving gear 11 and the second driving gear 12. Of course, for safety reasons, the number of teeth on the rack structure can also be set to be greater than the sum of the number of teeth of the two driving gears.

[0037] Of course, in other embodiments, when the space inside the cylinder block is sufficient, the first rack structure 14 and the second rack structure 15 can also be arranged on the outer peripheral surface of the piston rod 13 and arranged along the same straight line. At this time, the first driving gear 11 and the second driving gear 12 are both located on the same side of the axis of the piston rod 13 or the piston rod 13 is set as a rod with a square cross-section. Of course, in other embodiments, the first rack structure 14 and the second rack structure 15 can also be respectively arranged on the outer peripheral surface of the piston rod 13 at a 90-degree angle to each other. At this time, the first driving gear 11 and the second driving gear 12 do not have to be symmetrically arranged along the axis of the piston rod 13. Of course, in other embodiments, the first rack structure 14 and the second rack structure 15 can also be arranged asymmetrically in the axial direction. All the teeth on the first rack structure 14 and the second rack structure 15 are utilized. At this time, the number of teeth on the two rack structures is set to be less than the sum of the number of teeth of the two driving gears.

[0038] Such as Figure 1 and Figure 2As shown, when the two driving gears are symmetrically arranged about the axis of the piston rod 13, in order to achieve alternating reciprocating motion, the two driving gears should rotate in the same direction. In this embodiment, a first driving shaft extending out of the housing 35 is provided on the first driving gear 11, and a second driving shaft extending out of the housing 35 is provided on the second driving gear 12. The end parts of the two driving shafts are respectively provided with a first pulley 17 and a second pulley 18, and the two pulleys are driven by the same belt 19. This can not only ensure the synchronous movement of the two pulleys, but also make the two driving gears linked. Then, only one of the gears needs to be driven to rotate. That is to say, through the setting of the pulleys, the two driving gears can be kept rotating synchronously, and at the same time, the setting of the power source can be saved. Of course, the pulleys in this embodiment can also be replaced with sprockets, and at this time the belt is also replaced with a chain. Or in other embodiments, the pulleys can also be replaced with gears, and the gear structure is used to drive the two driving shafts at the same time.

[0039] Of course, in other embodiments, two power sources can also be respectively provided. One power source drives the rotation of the first driving gear 11 through the first driving shaft, and the other power source drives the rotation of the second driving gear 12 through the second driving shaft. At this time, the installation positions and rotation directions of the two driving gears are more free. Of course, in other embodiments, the two driving gears can also be arranged on the same side of the piston rod 13. At this time, the rotation directions of the two driving gears should be opposite, and the belt 19 or the sprocket can be wound in an "8" shape, so that the rotation directions of the two driving gears driven by the same power source are opposite.

[0040] In Embodiment 2 of the reciprocating piston compressor in the present invention:

[0041] This embodiment is improved on the basis of Embodiment 1. Specifically, pistons are respectively arranged at both ends of the piston rod 13, so that the air compression efficiency is higher.

[0042] Specifically, in this embodiment, pistons are respectively arranged at the end parts of both ends of the piston rod 13. During the reciprocating movement of the piston rod 13, gas can be compressed at both ends respectively, and the compression efficiency is higher. In order to further improve the compression efficiency, two piston rods 13 can also be provided, and two pistons are respectively arranged at both ends of each piston rod 13 to compress the gas.

[0043] Specifically, in this embodiment, a support column 16 is provided inside the housing 35. A through hole for the piston rod 13 to pass through is provided in the middle of the support column 16, and the piston rod 13 can perform reciprocating linear motion under the support of the through hole. The two lateral ends of the housing 35 are respectively formed into cylindrical shapes, and cylindrical cavities are provided inside the two lateral ends of the housing 35. The two ends of the housing 35 constitute the cylinder block main body 26. An air inlet and an air outlet are respectively provided in the up-down direction of the cylinder block main body 26. An intake check valve 27 is provided on the air inlet, and an exhaust check valve 28 is provided on the air outlet. The intake and exhaust actions are facilitated through the check valves and the movement of the piston. The piston is a piston plate 21, and a connecting seat 23 is provided between the piston rod 13 and the piston plate 21. That is to say, the piston plate 21 is fixedly arranged at the end of the piston rod 13 through the connecting seat 23. Since air chambers are formed at both lateral ends of the housing 35, in order to facilitate intake and exhaust, an intake passage 33 is further formed inside the housing 35. The intake passage 33 is respectively communicated with the two air inlets, and the exhaust passage 34 is respectively communicated with the two air outlets, which is convenient for saving the setting of the passages. Of course, the air passages on both sides can also be made non-communicating, and in this case, the two gases can be compressed separately. In addition, during the reciprocating movement of the piston plate 21, it is necessary to prevent the piston plate 21 from over-traveling. Therefore, a limit baffle 25 for limiting the movement limit of the piston plate 21 is further provided on the side of the support column 16 close to the piston plate 21.

[0044] Since there is only one intake passage 33 and one exhaust passage 34, while there are two air inlets and two air outlets respectively, in order to achieve buffering during the intake and exhaust processes, an intake buffer tank 31 communicating with the intake passage 33 and an exhaust buffer tank 32 communicating with the exhaust passage 34 are further provided. It should be noted that the intake buffer tank 31 and the exhaust buffer tank 32 refer to tanks capable of storing gas.

[0045] In Embodiment 3 of the reciprocating piston compressor in the present invention:

[0046] This embodiment improves the reciprocating piston compressor in Embodiment 1 or Embodiment 2. During the reciprocating movement of the piston plate 21, it is easy to rub against the cylinder block. Therefore, a wear-resistant sleeve 24 is further nested inside the cylinder block main body 26.

[0047] Specifically, as Figure 1 and Figure 3As shown, the wear-resistant sleeve 24 is of a cylindrical structure. Perforations communicating with the air inlet and perforations communicating with the air outlet are respectively provided on the outer peripheral surface of the wear-resistant sleeve 24, thereby improving the durability of the product. A bottom plate 22 is further provided inside the wear-resistant sleeve 24. The bottom plate 22 blocks the end of the wear-resistant sleeve 24 to form a chamber with a variable volume between the bottom plate 22 and the piston. During the process of compressing the gas, the distance between the piston plate 21 and the bottom plate 22 changes relatively, so that the volume between the piston plate 21 and the bottom plate 22 changes, thereby completing the compression of the gas.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. The patent protection scope of the present invention shall be subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention shall equally be included in the protection scope of the present invention.

Claims

1. A reciprocating piston compressor, comprising a piston rod, on which a rack structure is provided. The reciprocating piston compressor further comprises a driving gear that meshes with and drives the rack structure on the piston rod. Characterized in that: The driving gear comprises a smooth tooth section and a toothed section, so that the driving gear is in a meshing state and a free state with the rack structure during rotation; the driving gear comprises at least two and / or the rack structure comprises at least two, so that the driving gear and the rack structure form a first transmission mechanism and a second transmission mechanism for driving the piston rod to move forward and backward, and when one of the first transmission mechanism and the second transmission mechanism is in a meshing state, the other is in a free state, so that the driving gear drives the piston rod to move forward and backward alternately during one-way rotation.

2. The reciprocating piston compressor according to claim 1, Characterized in that: The rack structure comprises a first rack structure and a second rack structure independently provided on the outer side surface of the piston rod. The driving gear comprises a first driving gear and a second driving gear, wherein the first rack structure meshes with the first driving gear and the second rack structure meshes with the second driving gear.

3. The reciprocating piston compressor according to claim 2, Characterized in that: The first rack structure and the second rack structure are arranged at intervals around the outer circumference of the piston rod.

4. The reciprocating piston compressor according to claim 3, Characterized in that: The first rack structure and the second rack structure are arranged back to back, and the first driving gear and the second driving gear are respectively arranged on opposite sides of the piston rod.

5. The reciprocating piston compressor according to claim 4, Characterized in that: The first driving gear and the second driving gear are symmetrically arranged about the axis of the piston rod.

6. The reciprocating piston compressor according to claim 3 or 4, Characterized in that: The first rack structure and the second rack structure are symmetrically arranged about the axis of the piston rod.

7. The reciprocating piston compressor according to any one of claims 1-5, Characterized in that: A first driving shaft is provided on the first driving gear, and a second driving shaft is provided on the second driving gear. The ends of the first driving shaft and the second driving shaft away from the driving gear are in transmission cooperation through a belt or a chain or a gear structure to rotate synchronously.

8. The reciprocating piston compressor according to any one of claims 1-5, Characterized in that: The reciprocating piston compressor further comprises a cylinder block nested with the piston. The cylinder block comprises a cylinder block main body and a wear-resistant sleeve in direct contact with the piston.

9. The reciprocating piston compressor according to any one of claims 1-5, Characterized in that: The reciprocating piston compressor further comprises a cylinder block nested with the piston. There are two pistons, and the two pistons are respectively arranged at both ends of the piston rod. Two air inlets and two air outlets corresponding to the two pistons are provided on the cylinder block, and the two air inlets are communicated through an air inlet passage, and the two air outlets are communicated through an exhaust passage.

10. The reciprocating piston compressor according to claim 9, Characterized in that: Both the air inlet passage and the exhaust passage are provided on the cylinder block.

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