Transmission structure and refrigerator containing the same

Abstract

This invention discloses a transmission structure and a refrigeration machine containing the structure, relating to the field of refrigeration equipment technology. It includes a housing, a drive motor mounted on the inner wall of the housing, a rotating shaft connected to the output end of the drive motor, and symmetrically arranged discs on the outer wall of the rotating shaft. It also includes a connecting rod, the upper end of which is located at the top of the inner cavity of the housing. An offset shaft is mounted on the outer wall of the rotating shaft and rotatably connected to the connecting rod. An intake valve and an exhaust valve are correspondingly located below the discs. It also includes a deflector. When the rotating shaft rotates to the position where the valve stem needs to be squeezed, a squeezing plate made of engineering plastic automatically extends downwards under centrifugal force, pushing the valve stem by rolling and squeezing. When rotating to a non-squeezing position, the squeezing plate retracts into the arc-shaped groove under centrifugal force and the elastic recovery of the rubber ring, thus adapting to the gap changes caused by valve stem wear. Under the forward and reverse rotation of the drive motor, the squeezing plate slides to the other side of the arc-shaped groove, ensuring the accuracy of the valve opening and closing sequence.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and more specifically, to a transmission structure and a refrigeration machine containing the structure. Background Technology

[0002] Currently, the transmission structure in most refrigeration units adopts a swing arm type. This structure is widely used in the industry due to its stability, reliability, and low maintenance cost. Usually, only a few bearings need to be replaced to restore its use. However, the swing arm type structure mainly relies on mechanical transmission to achieve the timing control of air intake and exhaust during operation. It cannot change the phase angle of the valve by reversing the motor to achieve the heating function. Therefore, if a refrigeration unit using a swing arm type structure needs to achieve heating or temperature rise, it must rely on an additional heater, which increases the system's energy consumption to some extent.

[0003] In the practical application of swing-arm refrigeration units, rigid transmission components such as crank cams or eccentric wheels are typically used to drive the opening and closing of the intake and exhaust valves. During operation, the valve stem and transmission components are in rigid contact. With prolonged operation, the valve stem end face wears due to repeated impacts, causing the clearance between the valve stem and transmission components to gradually increase. This accumulated clearance causes the actual opening and closing times of the valves to deviate from the design sequence, resulting in the intake and exhaust valves opening simultaneously or closing with a delay, thus affecting the compression efficiency of the refrigeration unit. Therefore, we provide a transmission structure and a refrigeration unit incorporating this structure. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a transmission structure and a refrigeration machine containing the structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a housing, a drive motor is provided on the inner wall of the housing, a rotating shaft is connected to the output end of the drive motor, and a disc is symmetrically arranged on the outer wall of the rotating shaft. It also includes a connecting rod, the upper end of which is provided at the top of the inner cavity of the housing, and an off-axis is provided on the outer wall of the rotating shaft, the off-axis being rotatably connected to the connecting rod. The intake valve and exhaust valve are located correspondingly below the disc; The deflector, located on the outer wall of the disc, is used to generate a vertical displacement difference between the intake and exhaust valves when the shaft rotates.

[0006] Preferably, the deflector includes an air inlet groove and an exhaust groove respectively provided on the outer wall of the two sets of discs, and the air inlet groove and the exhaust groove are arranged alternately.

[0007] Preferably, the intake valve and the exhaust valve are respectively disposed in the intake groove and the exhaust groove, with the intake valve disposed on the side closer to the connecting rod and the exhaust valve disposed on the side farther away from the connecting rod.

[0008] Preferably, the outer walls of the air intake slot and the exhaust slot are slidably connected with arc-shaped plates. The arc-shaped plates have notches at both ends, and steel plates are installed in the notches on both sides. The steel plates on both sides are installed on the outside of the disc by bolts.

[0009] Preferably, the arc-shaped plate has an arc-shaped groove, an extrusion plate is provided in the arc-shaped groove, an opening is provided in the extrusion plate, a rubber strip is provided in the opening, the two ends of the rubber strip are provided at the two ends of the arc-shaped groove, and screws are provided at the two ends of the rubber strip.

[0010] Preferably, an intake valve stem and an exhaust valve stem are respectively provided in the intake valve and the exhaust valve, which are arranged in the intake valve and the exhaust valve by means of springs.

[0011] Preferably, an elastic block is provided at the bottom of the inner cavity of the housing, the elastic block is provided on the lower end face of the two sets of extrusion plates, and the elastic block is correspondingly matched with the intake valve rod and the exhaust valve rod.

[0012] Preferably, a movable cavity is formed inside the housing, and a piston is provided at one end of the connecting rod in the movable cavity, and the piston is disposed inside the movable cavity.

[0013] Preferably, the intake valve and the exhaust valve are connected to the movable chamber via air passages.

[0014] Preferably, the piston outer wall is provided with an exhaust port, which is connected to the exhaust end of the intake valve and the exhaust valve.

[0015] Preferably, the offset shaft is mounted on the outer wall of the rotating shaft by bolts.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, the extrusion plate automatically extends downward under the action of centrifugal force to push the valve stem by rolling extrusion. When rotated to the non-extrusion position, the extrusion plate retracts into the arc groove under the action of centrifugal force and elastic recovery of the rubber ring. This adapts to the gap changes caused by wear of the valve stem. Under the forward and reverse action of the drive motor, the extrusion plate slides to the other side of the arc groove to ensure the accuracy of the valve opening and closing sequence.

[0017] 2. In this invention, the device uses a design where the off-axis and the rotating shaft are not concentric, so that while the connecting rod drives the piston to reciprocate in the moving chamber, the extrusion plate on the disc drives the valve stem in a rolling contact manner, which greatly reduces the wear rate and frictional resistance of the contact surface. This structural design effectively slows down the reduction process of the wear angle of the intake and exhaust valves and extends the time period during which the intake valve opening period and the exhaust valve opening period do not coincide. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the shell proposed in this invention; Figure 2 The present invention proposes Figure 1 Enlarged view of point A; Figure 3 This is a side view of the elastic block proposed in this invention; Figure 4 This is a schematic diagram of the rotating shaft plane proposed in this invention; Figure 5 This is a schematic diagram of the extrusion plate proposed in this invention; Figure 6 The present invention proposes Figure 5 Enlarged view of point B; Figure 7 This is a schematic diagram of the forward rotation timing of the drive motor proposed in this invention; Figure 8 This is a schematic diagram of the drive motor reversal timing proposed in this invention.

[0019] In the picture: 1. Housing; 2. Drive motor; 3. Shaft; 4. Disc; 5. Connecting rod; 6. Offset shaft; 7. Exhaust valve; 8. Intake valve; 9. Deflector; 10. Intake slot; 11. Exhaust slot; 12. Arc plate; 13. Notch; 14. Steel plate; 15. Arc groove; 16. Extrusion plate; 17. Through port; 18. Rubber strip; 19. Screw; 20. Exhaust valve stem; 21. Intake valve stem; 22. Moving chamber; 23. Piston; 24. Exhaust port; 25. Elastic block. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, 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.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0025] Example 1 further illustrates the transmission structure and refrigeration unit containing the present invention. It includes a housing 1, with a drive motor 2 detachably mounted on the inner wall of the housing 1. The drive motor 2 is adjusted by an external controller, and the forward and reverse rotation angles of the drive motor 2 are less than 180°. A rotating shaft 3 is connected to the output end of the drive motor 2. A disc 4 is integrally formed symmetrically on the outer wall of the rotating shaft 3. It also includes a connecting rod 5, the upper end of which is movably connected to the top of the inner cavity of the housing 1. An offset shaft 6 is integrally formed on the outer wall of the rotating shaft 3, and the offset shaft 6 is rotatably connected within the connecting rod 5. Shaft 6 is bolted to the outer wall of shaft 3. Intake valve 8 and exhaust valve 7 are respectively located below disk 4. Deflector 9 is located on the outer wall of disk 4 and is used to generate a vertical displacement difference between intake valve 8 and exhaust valve 7 when shaft 3 rotates. Deflector 9 includes intake groove 10 and exhaust groove 11 respectively located on the outer walls of two sets of disks 4. Intake groove 10 and exhaust groove 11 are staggered. Intake groove 10 is located on the side closer to connecting rod 5 and exhaust groove 11 is located on the side away from connecting rod 5. It also includes intake valve 8 and exhaust valve 7. Depend on Figures 2 to 5As can be seen, since the intake groove 10 and the exhaust groove 11 are staggered, when the contact end of the disc 4 contacts the valve stem, the contact end of the exhaust part moves upward and does not contact the elastic block 25. At this time, the intake valve 8 is open and the exhaust valve 7 is closed. When the rotating shaft 3 reverses, the contact end of the exhaust part contacts the elastic block 25, and the elastic block 25 squeezes the valve stem. At this time, the intake valve 8 is closed and the exhaust valve 7 is open. Both the intake groove 10 and the exhaust groove 11 are slidably connected to the outer walls of the arc plate 12. The arc plate 12 has notches 13 at both ends. Steel plates 14 are inserted into the notches 13 on both sides. The steel plates 14 on both sides are installed on the outside of the disc 4 by bolts. The arc plate 12 has an arc groove 15. An extrusion plate 16 is installed in the arc groove 15. The intake groove 10 and the exhaust groove 11 are both arc-shaped, so that the arc plate 16 can have sufficient movement distance. The extrusion plate 16 has a through-hole 17. A rubber strip 18 is inserted into the through-hole 17. The two ends of the rubber strip 18 are fixedly connected to the two ends of the arc groove 15. Screws 19 are installed at the two ends of the rubber strip 18. The device has an arc-shaped plate 12 slidably connected to the outer wall of the air inlet groove 10 and the exhaust groove 11. An extrusion plate 16 is installed inside the arc-shaped plate 12 through a rubber ring. The extrusion plate 16 is made of engineering plastic and has stronger wear resistance. Since the arc-shaped plate 12 can slide in the air inlet groove 10 and the exhaust groove 11, the rigid extrusion of the extrusion plate 16 is transformed into rolling extrusion, which reduces the wear rate of the contact surface, extends the service life, and significantly reduces frictional resistance, improves transmission efficiency, and reduces energy loss. The rolling contact of the extrusion plate 16 can also buffer impact loads, making the valve opening and closing action smoother. Depend on Figures 7 to 8 It is known that regardless of whether the drive motor 2 in this invention rotates forward or backward, there is an angle between the opening period of the exhaust valve and the opening period of the intake valve, that is, both the exhaust valve 7 and the intake valve 8 are in a closed state. The angle between the opening period of the exhaust valve 7 and the opening period of the intake valve 8 is defined as the wear angle. After long-term use, the wear angle of the above-mentioned refrigeration machine will gradually decrease as the arc plate wears, affecting the timing of the opening. By setting the extrusion plate 16, the time during which the opening periods of the intake and exhaust valves do not coincide is extended, which further ensures the accuracy of the valve opening and closing sequence. Depend on Figures 3 to 6 It can be seen that the arc plate 12 is limited in the opening 17 by the rubber ring. When the drive motor 2 drives the rotating shaft 3 to rotate, the extrusion plate 16 on it rotates to the extrusion position. Under the action of centrifugal force and gravity, the extrusion plate 16 moves downward, thereby extruding the valve stem. When it moves upward, it retracts into the arc groove 15 to achieve adaptive extrusion. In summary, when the rotating shaft 3 rotates to the position where the valve stem needs to be squeezed, the squeezing plate 16 automatically extends downward under the combined action of centrifugal force and gravity, pushing the valve stem in a rolling squeezing manner. When it rotates to the non-squeezing position, the squeezing plate 16 retracts into the arc groove 15 under the action of weakened centrifugal force and elastic recovery of the rubber ring. This adaptive squeezing mechanism realizes passive dynamic compensation, thus automatically compensating for changes in valve stem clearance caused by wear. Working principle: When the drive motor 2 starts, it drives the rotating shaft 3 to rotate. The rotating shaft 3 drives the off-axis 6 on the outer wall to revolve around the axis of the rotating shaft 3. Since the off-axis 6 is not concentric with the rotating shaft 3, the off-axis 6 drives the upper end of the connecting rod 5 to swing at the top of the inner cavity of the housing 1 during the revolution. This drives the piston 23 connected to the lower end of the connecting rod 5 to move back and forth in the movable cavity 22, realizing the action of pumping or compressing air. At the same time, the rotating shaft 3 drives the two discs 4 to rotate synchronously. The air intake groove 10 and the exhaust groove 11 on the outer wall of the disc 4 rotate with the disc 4. Since the air intake groove 10 and the exhaust groove 11 are staggered, that is, phase difference, when the rotating shaft 3 rotates to a certain angle, the lower edge of the extrusion plate 16 of the air intake groove 10 just contacts the valve stem of the air intake valve 8 and presses down, opening the air intake valve 8. At this time, the groove opening of the exhaust groove 11 is in a high position and does not contact the rod of the exhaust valve 7, so the exhaust valve 7 remains closed. When the rotating shaft 3 continues to rotate to another angle, the extrusion plate 16 of the exhaust groove 11 presses down the exhaust valve 7 rod, opening the exhaust valve 7, while the intake groove 10 leaves the valve rod, and the intake valve 8 closes. This cycle repeats, and through the continuous rotation of the rotating shaft 3, the intake valve 8 and the exhaust valve 7 are alternately opened and closed, which, together with the movement of the piston 23, completes the intake and discharge of the refrigerant. The difference between this device and a follower crank cam is as follows: Its arc plate 12 can slide in the groove and can automatically adjust the extension amount according to the centrifugal force to compensate for the gap changes caused by valve stem or wear in real time. However, the follower crank cam is a rigid fixed structure and cannot be adaptively adjusted. Long-term operation is prone to valve opening and closing inaccurate due to the accumulation of gaps, which affects the refrigeration efficiency. Since the sliding structure allows the extrusion plate 16 to retract into the groove in the non-working position, unnecessary friction is reduced and the service life of valve and transmission components is extended.

[0026] Example 2

[0027] Based on Embodiment 1, the following technical features are added: an intake valve 8 rod and an exhaust valve 7 rod are respectively provided in the intake valve 8 and the exhaust valve 7, which are set in the intake valve 8 and the exhaust valve 7 by springs. An elastic block 25 is fixedly connected to the bottom of the inner cavity of the housing 1. The elastic block 25 is located on the lower end face of the two sets of extrusion plates 16. The elastic block 25 is correspondingly matched with the intake valve rod 21 and the exhaust valve rod 20. A movable cavity 22 is formed in the housing 1. A piston 23 is slidably connected to one end of the movable cavity 22 by the connecting rod 5. The piston 23 is located in the movable cavity 22. The intake valve 8 and the exhaust valve 7 are respectively connected to the movable cavity 22 through air passages. An exhaust hole 24 is provided on the outer wall of the piston 23. The exhaust hole 24 communicates with the exhaust end of the intake valve 8 and the exhaust valve 7. Depend on Figures 1 to 5 As can be seen, since the axis of the rotating shaft 3 is not on the connecting rod 5, but is rotatably connected to the connecting rod 5 through the off-axis 6 on the disc 4, when the rotating shaft 3 rotates, the off-axis 6 rotates synchronously. Since the upper end of the connecting rod 5 is movably connected to the top of the inner cavity of the housing 1, and the connecting rod 5 is long and narrow, with its upper end movably connected to the top of the inner cavity of the housing 1, and the axis of the off-axis 6 is rotatably connected to the connecting rod 5, when the rotating shaft 3 rotates, it will drive the connecting rod 5 to swing up and down with the off-axis 6, thereby driving the piston 23 at the bottom of the connecting rod 5 to move in the movable cavity 22. The elastic block 25 is horizontally L-shaped, with one longer end located on the upper surface of the intake valve stem 21 and the exhaust valve stem 20, and the bottom of the other end fixed to the inner wall of the housing 1. When the rotating shaft 3 drives the extrusion plate 16 to rotate, the two sets of extrusion plates 16 intermittently contact the elastic block 25, causing the elastic block 25 to deform, thereby driving the elastic block 25 to extrude the intake valve stem 21 and the exhaust valve stem 20. By using the elastic block 25 in conjunction with the extrusion plate 16, as shown in the figure, the contact area of ​​the elastic block 25 is much larger than the contact surface of the extrusion plate 16, which can effectively ensure the extrusion effect on the intake valve stem 21 and the exhaust valve stem 20, and ensure the time when the intake valve stem 21 and the exhaust valve stem 20 are extruded. Working principle: The mode switching of the refrigeration unit can be realized by controlling the forward and reverse rotation of the rotating shaft 3: When rotating forward, the exhaust valve 7 is open and the intake valve 8 is closed, and the piston 23 is at the optimal cooling angle to achieve cooling; when rotating in reverse, the intake valve 8 is open and the exhaust valve 7 is closed, and the piston 23 is at the optimal heating angle to achieve heating.

[0028] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A transmission structure, comprising a housing, a drive motor disposed on the inner wall of the housing, a rotating shaft connected to the output end of the drive motor, and discs symmetrically disposed on the outer wall of the rotating shaft, characterized in that, It also includes, A connecting rod, the upper end of which is located at the top of the inner cavity of the housing, and an off-axis is provided on the outer wall of the rotating shaft, the off-axis being rotatably connected inside the connecting rod; The intake valve and exhaust valve are located correspondingly below the disc; The deflector, located on the outer wall of the disc, is used to generate a vertical displacement difference between the intake and exhaust valves when the shaft rotates.

2. The transmission structure according to claim 1, characterized in that, The deflector includes an air intake groove and an exhaust groove respectively provided on the outer wall of two sets of discs. The air intake groove and the exhaust groove are arranged alternately, and the outer wall of the air intake groove and the exhaust groove are slidably connected with an outwardly protruding arc plate.

3. The transmission structure according to claim 2, characterized in that, The intake valve and exhaust valve are respectively located in the intake groove and exhaust groove, with the intake valve located on the side closer to the connecting rod and the exhaust valve located on the side farther away from the connecting rod.

4. The transmission structure according to claim 3, characterized in that, The arc-shaped plate has notches at both ends, and steel plates are installed in the notches on both sides. The steel plates on both sides are installed on the outside of the disc by bolts.

5. A transmission structure according to claim 2, characterized in that, The arc-shaped plate has an arc-shaped groove, and an extrusion plate is provided in the arc-shaped groove. The extrusion plate has a through-hole, and a rubber strip is provided in the through-hole. The two ends of the rubber strip are provided at the two ends of the arc-shaped groove, and screws are provided at the two ends of the rubber strip.

6. A transmission structure according to claim 5, characterized in that, The extrusion plate is made of engineering plastic.

7. A transmission structure according to claim 5, characterized in that, The intake valve and exhaust valve are respectively equipped with an intake valve stem and an exhaust valve stem, which are set in the intake valve and exhaust valve by springs.

8. A transmission structure according to claim 6, characterized in that, Two sets of elastic blocks are provided at the bottom of the inner cavity of the housing. The two sets of elastic blocks are respectively located on the lower end face of the two sets of extrusion plates, and the two sets of elastic blocks cooperate with the intake valve rod and the exhaust valve rod respectively.

9. A transmission structure according to claim 7, characterized in that, A movable cavity is formed inside the housing. A piston is provided at one end of the connecting rod in the movable cavity. The piston is located inside the movable cavity. The intake valve and exhaust valve are respectively connected to the movable cavity through air passages.

10. A refrigeration machine, characterized in that, Includes the transmission structure as described in any one of claims 1-8.

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