Exhaust valve plate with hyperbolic profile, exhaust limiting plate and rotary compressor

Abstract

The application discloses a hyperbolic profile exhaust valve plate, an exhaust limiting plate and a rotary compressor. The exhaust valve plate comprises a fixed section and an opening and closing section. An opening line exists between the fixed section and the opening and closing section. The opening and closing section is provided with a circular arc shaped valve head. The opening and closing section is arranged in a hyperbolic shape from the opening line to both sides of the valve head. The end of the hyperbolic shape is arranged tangentially to the circular arc shape. The exhaust limiting plate comprises a mounting section and a stop section. The mounting section is connected to the fixed section. The stop section is raised and extended upwards along the opening line in a power function curve. The curvature of the hyperbolic profile curve changes uniformly, so that the stress of the overall exhaust valve plate is relatively uniform, and the reliability and performance of the compressor can be improved. The power index lift curve gradually increases. The curvature can be adjusted by the number of power indexes, so as to adjust the opening and closing time of the valve plate.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, specifically to a hyperbolic profile exhaust valve plate and exhaust limiting plate, and a rotary compressor. Background Technology

[0002] Existing rotary compressors typically use reed valves. When the cylinder pressure inside the compressor reaches a certain limit, the valve opens, venting high-pressure gas into the compressor housing. When the cylinder pressure is below the limit, the valve closes until the internal cylinder pressure rises back to the limit.

[0003] Valve plates play a crucial role in compressors. If a valve plate is damaged or leaks, the compressor will malfunction or its cooling capacity will decrease. The design of the valve plate directly affects the internal discharge pressure and discharge resistance of the compressor, thus impacting its performance.

[0004] Existing rotary compressors typically design the exhaust valve head as an arc, while the distance from the valve opening point to the valve head is usually a straight line. The abrupt transition between the straight line and the arc causes stress concentration and poor reliability. Furthermore, the stress gradually increases from the opening point to the valve head; a straight profile design is unreasonable, leading to gradually increasing deformation and making the valve head prone to breakage, thus affecting compressor reliability. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a hyperbolic profile exhaust valve plate, an exhaust limiting plate, and a rotary compressor.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An exhaust valve disc with a hyperbolic profile includes a fixed section and an opening / closing section. An opening line exists between the fixed section and the opening / closing section. The opening / closing section has an arc-shaped valve head. The opening / closing section is hyperbolic from the opening line to both sides of the valve head. The ends of the hyperbolic shape are tangent to the arc shape.

[0008] The two sides of this exhaust valve plate are designed with a hyperbolic profile, and the curvature of the curve changes evenly, so that the overall force on the exhaust valve plate is more uniform, which can improve the reliability and performance of the compressor. Moreover, the end of the hyperbolic shape is tangent to the arc shape, making this part of the structure smoother and more beautiful, which is conducive to airflow and also helps to improve the structural strength and load-bearing capacity of this part.

[0009] For the entire exhaust valve plate, the opening line should be a cross-section at that point. However, since the exhaust valve plate is very thin, it can be understood that this point is the starting line for the exhaust valve plate to tilt and flip upwards.

[0010] Furthermore, let the midpoint of the opening line (midpoint of the upper surface) be the origin O of the coordinate system, the x-axis be the horizontal coordinate axis from the opening line towards the end of the valve plate, and the y-axis be the horizontal coordinate axis perpendicular to the x-axis. Then, the hyperbola is set according to the following functional relationship:

[0011] ,

[0012] in, So that the hyperbolic shape is tangent to the side of the valve head;

[0013] In the formula, H is the vertical distance between the center of the opening line and the side of the opening / closing section, R is the radius of the valve head, and L is the distance between the midpoint of the opening line and the center of the valve head.

[0014] Furthermore, the fixed section has a valve plate connection hole at the end away from the opening line for connection and fixation; the fixed section and the two sides of the opening and closing section are connected in an arc transition in the area where the opening line is located, which can reduce stress concentration at the transition and angle change points and facilitate stress release.

[0015] Another aspect of the present invention provides an exhaust limiting plate for limiting the opening of the exhaust valve plate with the hyperbolic profile described above. The exhaust limiting plate includes an installation section and a stop section. The installation section is connected to the fixing section. When the opening and closing section is opened, it is attached to the lower surface of the stop section. The stop section curves upward and extends along the opening line in a power function curve.

[0016] Furthermore, let the midpoint of the opening line be the origin O, the x-axis be the horizontal coordinate axis from the opening line towards the valve plate end, and the Z-axis be arranged along the thickness direction of the exhaust limiting plate and be perpendicular to the x-axis. Then, the power function curve is set according to the following functional relationship:

[0017] ,

[0018] In the formula, n is a positive integer greater than 1, and E is the active stroke of the opening and closing section, that is, the distance between the midpoint of the lower surface of the head of the stop section and the x-axis. The distance between the projection of the midpoint of the lower surface of the stop section's head onto the x-axis and the origin of the coordinate system, or The distance between the midpoint of the opening line and the center of the valve head is denoted as .

[0019] Furthermore, n can take the value 2 or 3.

[0020] Furthermore, the value of E ranges from 1.5 to 2.5 mm.

[0021] Furthermore, the end of the mounting section away from the opening line is provided with a limiting plate connection hole, and the fixing section is in close contact with the lower surface of the mounting section.

[0022] Furthermore, the side plates of the mounting section and the fixing section are respectively provided with corresponding small grooves. These small grooves can be used as anti-misinstallation grooves to prevent the exhaust valve plate or the exhaust limit plate from being installed incorrectly or backwards. The mounting section and the fixing section are connected by rivets or screws, making the connection and installation simple and convenient.

[0023] The present invention also provides a rotary compressor, wherein a valve plate is provided inside the cylinder of the rotary compressor, the valve plate is provided with the above-mentioned exhaust limiting plate, and an exhaust valve plate arranged between the exhaust limiting plate and the valve plate.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention designs the exhaust valve plate opening line (point) to the valve plate head as a hyperbola profile, with uniform curvature, thereby making the overall force on the exhaust valve plate more uniform, which can improve the reliability and performance of the compressor; 2. The present invention designs the limit plate from the valve plate opening point to the valve plate head as a power function curve, with a gradual increase in the lift curve, and the curvature can be adjusted by the power function number, thereby adjusting the opening and closing time of the valve plate; 3. By making the stop section follow the upward curvature in a power function curve shape... Extending away from the opening and closing section, the outline of the stop section after it is flipped upwards can be a power function curve, which can make the curvature of the stop section gradually increase. That is, the degree of bending of each part of the limiting member from the installation section to the stop section gradually increases, so that the limiting member can withstand the gradually increasing impact force from the installation section to the stop section. This avoids the stop section from breaking due to stress concentration in one part of the limiting member from the installation section to the stop section. Furthermore, after the valve plate is opened, it can reduce the possibility of the limiting member being deformed by the impact of high-pressure gas and the valve plate. Attached Figure Description

[0025] Figure 1 This is a top view schematic diagram of an exhaust valve plate with a hyperbolic profile according to the present invention.

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of a power function curve-shaped exhaust limiting plate according to the present invention;

[0027] In the diagram: 1. Exhaust valve plate; 11. Fixed section; 12. Opening and closing section; 121. Connecting part; 122. Valve plate head; 2. Exhaust limit plate; 21. Mounting section; 22. Stop section. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and 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.

[0029] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Small refrigeration compressors are used in refrigeration equipment, such as compressors in household refrigerators, freezers, small air conditioners, and beverage coolers. These compressors have low power, relatively simple structure, and are easy to install and maintain.

[0031] Currently, during the compressor's exhaust process, the high-speed, high-pressure gas-liquid mixture ejected from the compressor cylinder impacts the valve plate through the outlet, causing the valve plate to bend upwards and open the outlet. After being impacted, the valve plate also collides with the valve plate baffle. The valve plate baffle deforms due to the continuous impact force from the high-speed, high-pressure gas-liquid mixture and the valve plate, affecting the compressor's performance.

[0032] Therefore, embodiments of this application propose an exhaust assembly for a compressor, such as... Figure 1 and Figure 2 As shown.

[0033] The exhaust assembly includes an exhaust valve plate 1 and an exhaust limiting plate 2. The exhaust valve plate 1 includes a fixed section 11 and an opening / closing section 12. The exhaust limiting plate 2 includes an installation section 21 and a stop section 22. The installation section 21 is connected to the fixed section 11. The stop section 22 extends along a first direction in a power function curve and is disposed away from the opening / closing section 12. The opening / closing section 12 is movable along the first direction, and at least partially movable to abut against the stop section 22.

[0034] In the embodiments provided in this application, since the compressor has a valve plate with an exhaust port, the exhaust valve plate 1 can be located between the exhaust limiting plate 2 and the valve plate. The first direction can be the up-down direction, and the exhaust limiting plate 2 can be positioned directly above the exhaust valve plate 1. The opening and closing section 12 of the exhaust valve plate 1 can be positioned above the exhaust port. When the cylinder pressure in the compressor reaches a limited value, the cylinder will discharge high-speed, high-pressure gas through the exhaust port. Since the exhaust valve plate 1 is thin and has low rigidity, the opening and closing section 12 will move upward toward the exhaust limiting plate 2 under the impact of the high-speed, high-pressure gas discharged from the cylinder. That is, the opening and closing section 12 can flip upward relative to the fixed section 11 to expose the exhaust port. The exhaust limiting plate 2 will withstand the impact of the high-speed, high-pressure gas discharged from the cylinder and the impact of the opening and closing section 12. At the same time, the exhaust limiting plate 2 will also block the exhaust valve plate 1 to prevent the exhaust valve plate 1 from flipping upward too high and deforming or even breaking.

[0035] The stop section 22 is located above the opening and closing section 12. The impact force borne by the exhaust limiting plate 2 from the mounting section 21 to the stop section 22 will gradually increase. The stop section 22 extends along the first direction in a power function curve shape and moves away from the opening and closing section 12. That is, the outline of the stop section 22 after it is flipped up can be a power function curve shape. In this way, the curvature of the stop section 22 will gradually increase. That is, the degree of bending of each part of the exhaust limiting plate 2 from the mounting section 21 to the stop section 22 will gradually increase, so as to withstand the gradually increasing impact force and avoid the stop section 22 from breaking due to stress concentration in one part of the exhaust limiting plate 2 from the mounting section 21 to the stop section 22. The mounting section 21 can be connected to the stop section 22 and is integrally formed, the fixing section 11 can be connected to the opening and closing section 12 and is integrally formed, the mounting section 21 is connected to the fixing section 11, the stop section 22 can be positioned above the opening and closing section 12, and the opening and closing section 12 can move in a first direction.

[0036] In some embodiments of this application, the mounting section 21 is detachably connected to the fixing section 11, the opening / closing section 12 includes a valve plate head 122 and a connecting portion 121, the first end of the connecting portion 121 is connected to the fixing section 11, and the second end of the connecting portion 121 is connected to the valve plate head 122. The expression of the power function curve is: Wherein, the midpoint of the opening line is the origin O of the coordinate system; the x-axis is a horizontal coordinate axis extending from the opening line towards the end of the valve plate; the Z-axis is arranged along the thickness direction of the exhaust limiting plate and is perpendicular to the x-axis; the first direction can also be the axial direction of the z-axis; when the opening / closing section 12 is directly below the stop section 22, E is the active stroke of the opening / closing section, that is, the distance between the midpoint of the lower surface of the head of the stop section and the x-axis. The distance between the projection of the midpoint of the lower surface of the stop section's head onto the x-axis and the origin of the coordinate system, or The distance between the midpoint of the opening line and the center of the valve head is at this time. The value of L can be used for calculation, and the two spacings are basically similar.

[0037] The valve head 122 can cover the exhaust port, thus closing the exhaust port even if the exhaust valve 1 is closed. When the exponent n is constant, the opening and closing time of the exhaust valve 1 can be adjusted by changing the value of E. When a larger value of E is needed, since the mounting section 21 and the fixing section 11 are detachably connected, it is easy to remove the exhaust limiting plate 2 and connect the mounting section 21 of the newly produced exhaust limiting plate 2 to the fixing section 11. The height of the stop section 22 of the new exhaust limiting plate 2 will be greater, so the distance from the stop section 22 to the exhaust port will increase, and the lift of the exhaust valve plate 1 will increase. That is, the travel of the opening and closing section 12 between the stop section 22 and the exhaust port will increase. Consequently, after the high-pressure gas discharged from the cylinder impacts the exhaust valve plate 1, the activity time of the opening and closing section 12 will increase, which can increase the opening time of the exhaust valve plate 1. After the exhaust valve plate 1 is opened, the distance between the opening and closing section 12 and the exhaust port is larger, which can allow more high-pressure gas to be discharged and improve the cooling capacity of the compressor.

[0038] The value of the value is inversely proportional to the opening degree of the exhaust valve plate 1. A larger value results in a longer opening / closing section 12 and thus a longer exhaust valve plate 1. The fixed section 11 and the valve plate head 122 of the exhaust valve plate 1 are arranged opposite each other, meaning the fixed section 11 can be located at the first end of the exhaust valve plate 1, and the valve plate head 122 can be located at the second end of the exhaust valve plate 1. The longer the exhaust valve plate 1 is, the easier it is for the portion of the exhaust valve plate 1 between the fixed section 11 and the valve plate head 122 to break when the high-pressure gas discharged from the cylinder impacts the valve plate head 122. When the exhaust valve plate 1 is longer, the upward tilting height of the stop section 22 can be reduced to prevent the exhaust valve plate 1 from breaking due to excessive upward bending angle after being impacted. When the value is smaller, the exhaust valve plate 1 is shorter, allowing for an increase in the upward tilting height of the stop section 22, thereby increasing the opening degree of the exhaust valve plate 1.

[0039] Furthermore, the value of E ranges from 1.5 to 2.5 mm, and preferably from 1.8 to 2.2 mm. When the value of E is constant, the value of E should not be too large; otherwise, after being impacted by high-pressure gas, the exhaust valve plate 1 will flip upwards to its maximum height without contacting the exhaust limiting plate 2. This maximum flipping height is the maximum height at which the exhaust valve plate 1 will break, making it more prone to breakage. Of course, When the value of E is constant, the value of E should not be too small; otherwise, the opening of the exhaust valve plate 1 will decrease, reducing the amount of high-pressure gas discharged and thus reducing the cooling capacity of the compressor. Therefore, 1.5mm ≦ E ≦ 2.5mm. For example, E can be 1.5mm, 2mm, or 2.5mm.

[0040] Furthermore, n=2. The larger the value of n, the greater the upward tilt of the stop section 22, and the closer the stop section 22 is to the mounting section 21, making the outline of the stop section 22 more approximately a straight line; a smaller value of n allows the stop section 22 to abut against the opening / closing section 12 to prevent the exhaust valve plate 1 from breaking, and also avoids the exhaust limiting plate 2 from breaking due to stress concentration. Here, n can take values ​​of 2, 3, and 4, preferably 2. When the value of n is large, for example, n=5, A smaller z-value can prevent the stop segment 22 from flipping up too high.

[0041] In some embodiments of this application, the valve head 122 is circular, and the side of the connecting portion 121 is hyperbolic. This design avoids excessive abrupt changes at the connection between the connecting portion 121 and the valve head 122, and prevents stress concentration at the connection between the connecting portion 121 and the valve head 122 when the exhaust valve 1 is impacted by high-pressure gas, thereby preventing the exhaust valve 1 from breaking after impact.

[0042] Furthermore, the expression for the hyperbola is: a satisfies This is done so that the valve head 122 is tangent to the side of the connecting portion 121; wherein, the midpoint of the opening line is taken as the origin O, the x-axis is the horizontal coordinate axis from the opening line to the valve end, the y-axis is the horizontal coordinate axis perpendicular to the x-axis, H is the vertical distance between the center of the opening line and the side of the opening / closing section, which is also half the width of the narrow part of the connecting section, R is the radius of the valve head, and L is the distance between the midpoint of the opening line and the center of the valve head. When the side of the connecting portion 121 is tangent to the valve head 122, the expression for the tangency point P between the side of the connecting portion 121 and the valve head 122 is: The value of 'a' can be calculated from the expression of the hyperbola and the expression of the point of tangency, i.e. Thus, the side contour line of the connecting part 121 will always be tangent to the arc contour line of the valve plate head 122, making the transition at the connection between the connecting part 121 and the valve plate head 122 more uniform. This, in turn, makes the force on the exhaust valve plate 1 more uniform and less prone to deformation, thereby improving the reliability and performance of the compressor. Taking a certain compressor model as an example, with R = 5mm, H = 3mm, and L = 12mm, when a = 0.18mm, the side contour line of the connecting part 121 will be tangent to the arc contour line of the valve plate head 122.

[0043] Furthermore, the mounting section 21 and the fixing section 11 can be connected by rivets or screws, or by threads. For example, the mounting section 21 may have a threaded post protruding outwards, and the fixing section 11 may have a threaded hole. The exhaust limiting plate 2 and the exhaust valve plate 1 can be connected together through the cooperation of the threaded post and the threaded hole. The threaded connection between the mounting section 21 and the fixing section 11 can ensure the connection stability and reliability of the exhaust limiting plate 2 and the exhaust valve plate 1, and the mounting section 21 can be easily tightened and loosened by rotation. Of course, both the mounting section 21 and the fixing section 11 can be provided with the threaded hole, and bolts can be passed through the two threaded holes to connect the mounting section 21 and the fixing section 11.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An exhaust limiting plate, characterized in that, The exhaust limiting plate is used to limit the opening of the exhaust valve plate with a hyperbolic profile. The exhaust valve plate includes a fixed section and an opening / closing section. There is an opening line between the fixed section and the opening / closing section. The opening / closing section has an arc-shaped valve head. The opening / closing section is hyperbolic from the opening line to both sides of the valve head. The end of the hyperbolic shape is tangent to the arc shape. The exhaust limiting plate includes an installation section and a stop section. The installation section is connected to the fixed section. When the opening / closing section is open, it is attached to the lower surface of the stop section. The stop section curves upward and extends along the opening line in a power function curve. Let the midpoint of the opening line be the origin O, the x-axis be the horizontal coordinate axis from the opening line to the end of the valve plate, and the Z-axis be arranged along the thickness direction of the exhaust limiting plate and be perpendicular to the x-axis. Then the power function curve is set according to the following functional relationship: ， In the formula, n is a positive integer greater than 1, and E is the active stroke of the opening and closing section, that is, the distance between the midpoint of the lower surface of the head of the stop section and the x-axis. The distance between the projection of the midpoint of the lower surface of the stop section's head onto the x-axis and the origin of the coordinate system, or The distance between the midpoint of the opening line and the center of the valve head is denoted as .

2. The exhaust limiting plate according to claim 1, characterized in that, The fixed section is provided with a valve plate connection hole at one end away from the opening line, and the two sides of the fixed section and the opening / closing section are connected in an arc transition in the area where the opening line is located.

3. The exhaust limiting plate according to claim 1, characterized in that, n can be either 2 or 3.

4. The exhaust limiting plate according to claim 1, characterized in that, The value of E ranges from 1.5 to 2.5 mm.

5. The exhaust limiting plate according to claim 1, characterized in that, The mounting section is provided with a limiting plate connection hole at one end away from the opening line, and the fixing section is in close contact with the lower surface of the mounting section.

6. The exhaust limiting plate according to claim 1, characterized in that, The side plates of the mounting section and the fixing section are respectively provided with corresponding small grooves, and the mounting section and the fixing section are connected by rivets or screws.

7. A rotary compressor, characterized in that, The cylinder of the rotary compressor is provided with a valve plate, the valve plate is provided with an exhaust limiting plate as described in claim 1, and an exhaust valve plate arranged between the exhaust limiting plate and the valve plate.

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