Lift limiter, exhaust valve, compressor and refrigeration equipment

Abstract

The invention discloses a lift limiter, an exhaust valve, a compressor and refrigeration equipment, the lift limiter is used for being arranged on one side of a valve plate, the lift limiter comprises a mounting section, a transition section and a lift limiting section which are connected in the first direction, the mounting section is used for being connected with a mounting part of the valve plate, and the transition section is used for being connected with the lift limiting section; the lift limiting section is used for limiting the maximum lift of the head of the valve block, an oil guide structure is arranged on the side, facing the valve block, of the transition section and used for guiding lubricating oil between the transition section and the valve block to move in the second direction, and the second direction is different from the first direction. According to the technical scheme, the viscous effect of lubricating oil between the lift limiter and the valve plate can be reduced when the valve plate is closed, and the quick-opening and quick-closing performance of the valve plate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a lift limiter, an exhaust valve, a compressor and a refrigeration equipment. BACKGROUND

[0002] The compressor usually uses a reed valve as an exhaust valve. The reed valve generally includes a valve piece and a lift limiter. The valve piece changes the state of the exhaust hole. When the valve piece covers the exhaust hole, the exhaust hole is blocked. When the valve piece is lifted, the exhaust hole is open. The lift limiter (also known as back plate) is used to limit the maximum displacement of the valve piece. In addition, the lift limiter can also affect the stiffness of the valve piece, thereby affecting the opening and closing speed of the valve piece. The design goal of the reed valve is to quickly open when the compressor starts to exhaust, and quickly close when the compressor stops exhausting.

[0003] However, the conventional reed valve has a serious lubricating oil adhesion effect between the lift limiter and the valve piece, which reduces the closing speed of the valve piece and reduces the quick opening and closing performance of the valve piece. Therefore, the valve piece cannot be closed in time after the compressor stops exhausting, which causes the refrigerant to backflow, thereby reducing the performance of the compressor. SUMMARY

[0004] The main purpose of the present application is to provide a lift limiter which can reduce the adhesion effect of lubricating oil between the lift limiter and the valve piece when the valve piece is closed, and improve the quick opening and closing performance of the valve piece.

[0005] To achieve the above-mentioned purpose, the lift limiter provided by the present application is arranged on one side of the valve piece. The lift limiter includes a mounting section, a transition section and a lift limiting section connected in a first direction. The mounting section is used to connect with the mounting part of the valve piece. The lift limiting section is used to limit the maximum lift of the head part of the valve piece. The transition section is provided with an oil guiding structure on one side of the valve piece. The oil guiding structure is used to guide the lubricating oil between the transition section and the valve piece to move in a second direction. The second direction is different from the first direction.

[0006] In one embodiment, the oil guiding structure includes at least one oil guiding groove recessed in the transition section.

[0007] In one embodiment, the oil guiding groove has at least one oil outlet port penetrating through the sidewall of the lift limiter.

[0008] In one embodiment, the oil outlet port is located on one side of the width direction of the lift limiter. The oil guiding groove also has a guide inclined surface which is inclined and extended from bottom to top towards the side close to the oil outlet port in the height direction of the lift limiter.

[0009] In one of the embodiments, the slope of the guide slope is greater than 0 and less than or equal to tan75°.

[0010] In one of the embodiments, the oil guide structure comprises two oil guide grooves arranged along the width direction of the lift limiter, each of the oil guide grooves is provided with the oil discharge port on the side away from the other oil guide groove, and each of the oil guide grooves is provided with the guide slope on the side close to the other oil guide groove, and the two guide slopes are arranged at an angle.

[0011] In one of the embodiments, the angle between the two guide slopes is greater than or equal to 30° and less than 180°.

[0012] In one of the embodiments, a convex part is arranged at the intersection of the two guide slopes and extends along the first direction, the mounting section has a first limiting surface facing the valve plate, the convex part has a second limiting surface facing the valve plate, the lift limiting section has a third limiting surface facing the valve plate, and the first limiting surface, the second limiting surface and the third limiting surface are continuously connected and gradually upwardly tilted along the first direction.

[0013] In one of the embodiments, the width of the second limiting surface is not less than 0.5 mm and not greater than 2 mm.

[0014] In one of the embodiments, the oil guide groove has two oil discharge ports, and the two oil discharge ports respectively penetrate the two side walls in the width direction of the lift limiter.

[0015] In one of the embodiments, the oil guide groove is provided in plurality, and the plurality of oil guide grooves are arranged at intervals along the first direction.

[0016] In one of the embodiments, one side of the lift limiting section facing the valve plate is provided with a hole;

[0017] In one of the embodiments, the ratio of the area of the lift limiting section to the area of the head of the valve plate is not less than 10% and not greater than 90%.

[0018] The application further provides an exhaust valve, comprising:

[0019] a valve plate having a mounting part, an intermediate part and a head part connected in sequence along the length direction; and

[0020] The lift limiter as described above is arranged on the side of the valve plate away from the exhaust hole, the mounting section is fixedly connected with the mounting part, the transition section is correspondingly arranged with the intermediate part, the lift limiting section is correspondingly arranged with the head part, and a gap is formed between the lift limiting section and the head part when the valve plate closes the exhaust hole.

[0021] The present invention also provides a compressor comprising the exhaust valve as described above.

[0022] The present invention also provides a refrigeration device comprising the compressor as described above.

[0023] The technical solution of the present invention is to provide an oil guide structure on the side of the transition section facing the valve disc, and the oil guide structure is used to guide the lubricating oil between the transition section and the valve disc to move in a second direction. In this way, during the process of the valve disc being lifted, at least a portion of the lubricating oil between the valve disc and the transition section will move in the second direction under the guidance of the oil guide structure. Because the second direction is different from the first direction, the movement of the lubricating oil in the first direction to the space between the lift limit section and the head of the valve disc can be reduced or prevented. This reduces the amount of oil stored between the lift limit section and the head of the valve disc, thereby reducing the sticking effect between the valve disc and the lift limiter, and thus improving the quick opening and closing performance of the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 It is a structural diagram of an exhaust valve in the prior art;

[0026] Figure 2 This is a schematic structural diagram of an exhaust valve according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 The main view of the exhaust valve;

[0028] Figure 4 Schematic diagram of the structure of an embodiment of the lift limiter of the present invention;

[0029] Figure 5 for Figure 4 A structural diagram of the mid-lift limiter from another perspective;

[0030] Figure 6 for Figure 4 Schematic diagram of the cross-section structure of the mid-lift limiter;

[0031] Figure 7 Schematic diagram of the structure of another embodiment of the lift limiter of the present invention;

[0032] Figure 8 for Figure 7 A structural diagram of the mid-lift limiter from another perspective;

[0033] Figure 9 Exhaust hole and valve plate between the lubricating oil adhesion effect diagram for the lift limiter and the valve plate between the lubricating oil adhesion;

[0034] Figure 10 For the valve plate lift-time curve diagram of the conventional lift limiter (referred to as the conventional back plate in the figure) and the lift limiter (referred to as the oil guide back plate in the figure) of an embodiment of the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] Reference Name Reference Name 100 Exhaust valve 221 Oil guide groove 10 Valve plate 2211 Oil discharge port 11 Mounting portion 2212 Guide slope 12 Intermediate portion 222 Protrusion 13 Head portion 2221 Second limit surface 20 Lift limiter 23 Lift limiting section 21 Mounting section 231 Third limit surface 211 First limit surface 232 Hole 212 Mounting hole 30 Fastener 22 Transition section 10’ Valve plate 100’ Exhaust valve 20’ Lift limiter

[0037] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0040] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0041] Compressor tongue spring valve is commonly used as exhaust valve. Tongue spring valve generally includes valve piece and lift limiter. Valve piece plays a role of changing the state of exhaust hole conduction. When valve piece covers exhaust hole, exhaust hole is blocked. When valve piece is lifted, exhaust hole is conducted. Lift limiter (also called back plate) is used to limit the maximum displacement of valve piece opening. In addition, lift limiter can also affect the stiffness of valve piece, thereby affecting the opening and closing speed of valve piece. The design goal of tongue spring valve is generally to quickly open when the compressor starts to exhaust, and to quickly close when the compressor ends to exhaust.

[0042] Taking a rotor compressor as an example, the friction pairs of each moving part of the rotor compressor need to be lubricated, the motor needs to be cooled, and a large amount of lubricating oil needs to be injected into the compressor. Some lubricating oil will leak into the cylinder of the compressor, and these lubricating oils will go through the compression and exhaust process together with the refrigerant. In the exhaust process, these lubricating oils will be discharged from the exhaust hole and enter the muffler and gather at the valve seat position. The tongue spring valve is generally installed at the valve seat position of the main and auxiliary bearings, so when the tongue spring valve is in the closed state, the valve piece as a whole and the installation position of the lift limiter will be immersed in the lubricating oil. As shown in Figure 1 The lubricating oil between the installation position of the lift limiter 20' and the valve piece 10' will be squeezed into the middle position between the head position of the lift limiter 20' and the head position of the valve piece 10' during the opening of the valve piece 10'. Therefore, when the valve piece 10' is opened to the maximum lift, the valve piece 10' as a whole is attached to the lift limiter 20', and there is an oil film in the middle of the entire attachment position. When the valve piece 10' is closed, the viscous effect of the oil film in the middle of the attachment position between the valve piece 10' and the lift limiter 20' will reduce the closing speed of the valve piece 10', thereby reducing the quick opening and closing performance of the valve piece 10'. This will cause the valve piece 10' to be unable to close in time after the compressor ends to exhaust, resulting in the problem of refrigerant backflow and the performance of the compressor being reduced.

[0043] Based on this, the present application provides a lift limiter 20 which, when applied to an exhaust valve 100, can reduce the viscous effect of the lubricating oil between the lift limiter 20 and the valve piece 10 when the valve piece 10 is closed, thereby improving the quick opening and closing performance of the valve piece 10.

[0044] The present application provides a lift limiter 20.

[0045] Please refer to Figures 2 to 8In some embodiments of the present application, the lift limiter 20 is arranged on one side of the valve plate 10, and the lift limiter 20 comprises a mounting section 21, a transition section 22 and a lift limiting section 23 connected in sequence in a first direction, the mounting section 21 is arranged to be connected with the mounting portion 11 of the valve plate 10, the lift limiting section 23 is arranged to limit the maximum lift of the head portion 13 of the valve plate 10, and the transition section 22 is provided with an oil guiding structure on the side facing the valve plate 10, the oil guiding structure is arranged to guide the lubricating oil between the transition section 22 and the valve plate 10 to move in a second direction, and the second direction is different from the first direction.

[0046] The lift limiter 20 is arranged on the side of the valve plate 10 away from the exhaust hole, and the lift limiter 20 and the valve plate 10 cooperate to form the exhaust valve 100. The exhaust valve 100 is arranged on the valve seat, the valve seat is provided with the exhaust hole, the valve plate 10 is arranged to open or close the exhaust hole, and the lift limiter 20 is arranged on the side of the valve plate 10 away from the exhaust hole. The lift limiter 20 comprises a mounting section 21, a transition section 22 and a lift limiting section 23 connected in sequence in a first direction (which can be a length direction), and the valve plate 10 comprises a mounting portion 11, an intermediate portion 12 and a head portion 13 connected in sequence in the first direction. The mounting section 21 of the lift limiter 20 is arranged and fixed corresponding to the mounting portion 11 of the valve plate 10, for example, the mounting section 21 and the mounting portion 11 are provided with mounting holes 212 for the fastener 30 to pass through, and the mounting section 21 and the mounting portion 11 are connected and fixed by the fastener 30. The transition section 22 of the lift limiter 20 is arranged corresponding to the intermediate portion 12 of the valve plate 10, and the lift limiting section 23 of the lift limiter 20 is arranged corresponding to the head portion 13 of the valve plate 10. The side of the lift limiting section 23 facing away from the transition section 22 gradually tilts upward. In this way, when the valve plate 10 closes the exhaust hole, a certain gap is formed between the top surface of the valve plate 10 and the lift limiting section 23. When the exhaust hole is exhausted, the airflow impacts the head portion 13 of the valve plate 10, so that the head portion 13 of the valve plate 10 is lifted upward to open the exhaust hole, and when the valve plate 10 is lifted to the maximum displacement, the head portion 13 of the valve plate 10 is limited and abuts against the lift limiting section 23.

[0047] In actual application, the mounting portion 11 of the valve plate 10 and the mounting section 21 of the lift limiter 20 are usually infiltrated with a large amount of lubricating oil, and in the process of lifting the valve plate 10 upward, the lubricating oil between the mounting portion 11 and the mounting section 21 is extruded to the intermediate portion 12 and the transition section 22 along the first direction, and then extruded to the head portion 13 and the lift limiting section 23, so that an oil film is formed between the whole valve plate 10 and the adhesion portion of the lift limiter 20, thereby causing a serious lubricating oil adhesion effect, which reduces the closing speed of the valve plate 10 and reduces the fast opening and closing performance of the valve plate 10. In order to reduce the adhesion effect of the lubricating oil, the technical scheme of the present application is provided with a guide oil structure on the side of the transition section 22 facing the valve plate 10, which is used to guide the lubricating oil between the transition section 22 and the valve plate 10 to move along the second direction. In this way, at least part of the lubricating oil between the valve plate 10 and the transition section 22 moves along the second direction under the guidance of the guide oil structure in the process of lifting the valve plate 10, and since the second direction is different from the first direction, the lubricating oil can be reduced or prevented from moving along the first direction to the lift limiting section 23 and the head portion 13 of the valve plate 10, thereby reducing the amount of oil between the lift limiting section 23 and the head portion 13 of the valve plate 10, and reducing the adhesion effect between the valve plate 10 and the lift limiter 20, thereby improving the fast opening and closing performance of the valve plate 10.

[0048] It should be noted that the specific setting mode of the guide oil structure is various, including but not limited to the guide oil structure realized by a guide oil groove 221, a guide oil rib, a guide oil surface and the like. The second direction is different from the first direction, which can be understood as the second direction intersecting with the first direction or being opposite to the first direction. For example, the first direction can be specifically a direction along the length direction of the lift limiter 20 from back to front; when the second direction intersects with the first direction, the second direction can be a width direction or a height direction of the lift limiter 20, or the second direction can be an obliquely upward direction or an obliquely downward direction, etc.; when the second direction is opposite to the first direction, the second direction can be a direction along the length direction of the lift limiter 20 from front to back; as long as the first direction is inconsistent with the second direction.

[0049] As shown in FIGS. Figure 4 and Figure 7 In some embodiments, the guide oil structure includes at least one guide oil groove 221 recessed in the transition section 22. The guide oil groove 221 includes but is not limited to a circular groove, a square groove, a strip-shaped groove or other special-shaped grooves, etc. The guide oil groove 221 can be a sunken groove, a through groove or a notched groove, etc. The number of guide oil grooves 221 can be set according to actual needs, which can be one, two, three or more, and is not limited here.

[0050] In the embodiment, when the valve plate 10 is lifted, the lubricating oil between the valve plate 10 and the transition section 22 is pressed into the oil guide groove 221 and moves along the oil guide groove 221. By arranging the oil guide groove 221, not only the oil guiding effect is achieved, but also the oil storage effect is achieved, so that the lubricating oil between the valve plate 10 and the transition section 22 is shunted, the amount of lubricating oil moving towards the head 13 of the valve plate 10 is reduced, and the lubricating oil adhesion effect between the valve plate 10 and the lift limiter 20 is reduced. Moreover, by arranging the oil guide groove 221, the side of the transition section 22 facing the valve plate 10 has a certain empty area, so that the contact area between the valve plate 10 and the lift limiter 20 is reduced, and the lubricating oil adhesion effect between the valve plate 10 and the lift limiter 20 is further reduced. In addition, the oil guide structure adopts the form of a groove, which is simple in structure, easy to produce and manufacture, and can reduce the manufacturing cost.

[0051] Please refer to Figure 4 and Figure 8 In some embodiments, the oil guide groove 221 has at least one oil discharge port 2211 penetrating through the side wall of the lift limiter 20. In this way, when the valve plate 10 is lifted, the lubricating oil between the valve plate 10 and the transition section 22 is pressed into the oil guide groove 221 and can be discharged to the outside of the exhaust valve 100 through the oil discharge port 2211, which is more conducive to reducing or preventing the lubricating oil from moving towards the head 13 of the valve plate 10 and the lift limiting section 23, thereby further reducing the lubricating oil adhesion effect between the valve plate 10 and the lift limiter 20. The number of oil discharge ports 2211 can be designed as one, two, three or more as needed. The shape of the oil discharge port 2211 includes but is not limited to a circular port, a square port or other special-shaped ports, etc.

[0052] Please refer to Figures 4 to 6 In one of the embodiments, the oil discharge port 2211 is located on one side of the lift limiter 20 in the width direction, and the oil guide groove 221 further has a guide slope 2212 which is arranged to extend obliquely from below to the side close to the oil discharge port 2211 in the height direction of the lift limiter 20.

[0053] In the embodiment, by arranging the guide slope 2212, when the valve plate 10 is lifted, the lubricating oil is pressed upwards, and the lubricating oil entering the oil guide groove 221 moves obliquely upwards along the guide slope 2212 and then is discharged from the oil discharge port 2211, so that the discharge of the lubricating oil is smoother, which is more conducive to reducing or preventing the lubricating oil from moving towards the head 13 of the valve plate 10 and the lift limiting section 23, thereby further reducing the lubricating oil adhesion effect between the valve plate 10 and the lift limiter 20.

[0054] Further, the slope of the guide slope 2212 is greater than 0 and less than or equal to tan 75°. Wherein, the slope of the guide slope 2212 is the tangent value of the inclination angle of the guide slope 2212 relative to the horizontal plane, for example, as shown in Figure 6 the inclination angle of the guide slope 2212 relative to the horizontal plane is a, then the slope of the guide slope 2212 is tan a. Wherein, 0 < a < 75°. For example, the slope of the guide slope 2212 can be designed as tan 5°, tan 15°, tan 25°, tan 35°, tan 45°, tan 55°, tan 65°, tan 75°, or any value between 0 and tan 75°. Alternatively, the slope of the guide slope 2212 is 1 (i.e. tan 45°), which can ensure smooth oil guiding and make the structure of the lift limiter 20 not too thin and weak, thereby ensuring the reliability of the lift limiter 20.

[0055] As shown in Figure 5 and Figure 6 in one embodiment, the oil guiding structure includes two oil guiding grooves 221 arranged along the width direction of the lift limiter 20, each of the oil guiding grooves 221 is provided with the oil outlet 2211 away from the side of the other oil guiding groove 221, and each of the oil guiding grooves 221 is provided with the guide slope 2212 close to the side of the other oil guiding groove 221, and the two guide slopes 2212 are arranged at an included angle.

[0056] In this embodiment, when the valve plate 10 is lifted upward, the valve plate 10 extrudes the lubricating oil, so that the lubricating oil can be divided into two paths and enter the two oil guiding grooves 221 respectively, and then be discharged from the oil outlets 2211 on both sides of the lift limiter 20 under the guidance of the two guide slopes 2212. In this way, the oil guiding and discharging capacity can be further improved, which is more conducive to the smooth and rapid discharge of the lubricating oil between the valve plate 10 and the lift limiter 20, and is more conducive to reducing or preventing the lubricating oil from moving towards the head 13 of the valve plate 10 and the lift limiting section 23; and the increase in the number of oil guiding grooves 221 can further reduce the contact area between the valve plate 10 and the lift limiter 20. In this way, through the comprehensive effect of multiple aspects, the lubricating oil adhesion between the valve plate 10 and the lift limiter 20 can be more effectively reduced, and the fast opening and closing performance of the valve plate 10 can be better improved.

[0057] In one embodiment, the included angle between the two guide slopes 2212 is greater than or equal to 30° and less than 180°. For example, as shown in Figure 6As shown, the included angle between the two guide slopes 2212 is β, 30°≤β<180°. Among them, the included angle β between the two guide slopes 2212 can be 30°, 60°, 90°, 120°, 150°, 179° or any value between 30°-180°. Alternatively, the included angle β between the two guide slopes 2212 is 90°, which can not only ensure smooth oil guiding, but also make the structure of the lift limiter 20 not too thin and weak, thereby ensuring the reliability of the lift limiter 20.

[0058] Please combine Figure 3 and Figure 5 In one embodiment, the intersection of the two guide slopes 2212 is provided with a convex portion 222 extending in the first direction, the mounting section 21 has a first limiting surface 211 facing the valve plate 10, the convex portion 222 has a second limiting surface 2221 facing the valve plate 10, and the lift limiting section 23 has a third limiting surface 231 facing the valve plate 10, the first limiting surface 211, the second limiting surface 2221 and the third limiting surface 231 are continuously connected and gradually upwardly curved in the first direction.

[0059] In this embodiment, the first limiting surface 211, the second limiting surface 2221 and the third limiting surface 231 are continuously connected and gradually upwardly curved in the first direction, thereby forming a back plate profile line that matches the shape of the valve plate 10 after being lifted, so that the valve plate 10 can contact the lift limiter 20 at each part in the length direction of the valve plate 10 after being lifted, thereby ensuring that the stiffness of the valve plate 10 is not affected.

[0060] Further, the width dimension of the second limiting surface 2221 is not less than 0.5mm and not more than 2mm. In this way, the width dimension of the second limiting surface 2221 is moderate, so as to reduce the contact area between the valve plate 10 and the lift limiter 20, thereby reducing the viscous effect of the lubricating oil between the valve plate 10 and the lift limiter 20, and making the contact pressure of the valve plate 10 not too large to reduce the reliability. For example, as shown in the figure, the width dimension of the second limiting surface 2221 is L, 0.5mm≤L≤2mm. Among them, L can be 0.5mm, 1mm, 1.5mm, 2mm, and other values between 0.5-2. Figure 6

[0061] As shown in the figure, the width dimension of the second limiting surface 2221 is L, 0.5mm≤L≤2mm. Among them, L can be 0.5mm, 1mm, 1.5mm, 2mm, and other values between 0.5-2.

[0061] As shown in the figure, the width dimension of the second limiting surface 2221 is L, 0.5mm≤L≤2mm. Among them, L can be 0.5mm, 1mm, 1.5mm, 2mm, and other values between 0.5-2. Figure 7 and Figure 8As shown, in another embodiment, the oil guide groove 221 has two oil discharge ports 2211, which respectively penetrate the two side walls of the lift limiter 20 in the width direction. In this embodiment, the oil guide groove 221 has an oil inlet port on the bottom surface of the lift limiter 20 and two oil discharge ports 2211 respectively on the left and right sides of the lift limiter 20. When the valve plate 10 is lifted upward, the squeezed lubricating oil enters the oil guide groove 221 from the oil inlet port and is discharged from the two oil discharge ports 2211. In this way, the oil guiding and discharging capacity can be further improved, which is more conducive to reducing or preventing the lubricating oil from moving toward the head 13 of the valve plate 10 and the lift limiting section 23, effectively reducing the lubricating oil adhesion between the valve plate 10 and the lift limiter 20.

[0062] In order to further reduce the lubricating oil adhesion between the valve plate 10 and the lift limiter 20, as shown in Figure 8 As shown, the oil guide groove 221 is provided in multiple, and the multiple oil guide grooves 221 are arranged in the first direction. In this way, the number of oil guide grooves 221 is increased, which can further improve the oil guiding and discharging capacity, further reduce the contact area between the valve plate 10 and the lift limiter 20, and the arrangement of the multiple oil guide grooves 221 in the first direction can form a blocking structure, which is more conducive to reducing and preventing the lubricating oil from moving in the first direction between the head 13 of the valve plate 10 and the lift limiting section 23. In this way, through the comprehensive effect of multiple aspects, the lubricating oil adhesion between the valve plate 10 and the lift limiter 20 can be more effectively reduced, and the fast opening and closing performance of the valve plate 10 can be better improved.

[0063] On the basis of the above embodiments, as shown in Figure 5 and Figure 7 In some embodiments, as shown in the lift limiting section 23 is provided with a hole 232 facing the valve plate 10. By providing the hole 232, when the valve plate 10 is lifted, the contact area between the valve plate 10 and the lift limiting section 23 can be reduced, which can further reduce the lubricating oil adhesion between the valve plate 10 and the lift limiter 20 when the valve plate 10 is closed. The hole 232 can be a counterbore with one open end and one closed end, or a through hole with two through ends. Alternatively, the hole 232 is a through hole, which can squeeze the lubricating oil into the through hole and discharge it from the top port of the through hole when the head 13 of the valve plate 10 is attached to the lift limiting section 23, thereby more conducive to reducing the lubricating oil adhesion between the valve plate 10 and the lift limiter 20. The cross-sectional area of the hole 232 can be circular, oval, square, or other irregular cross-section. The number of holes 232 can be designed to be one, two or more according to actual needs.

[0064] For convenience of description, the lift limiter 20 will be referred to as the back plate hereinafter, and the lift limiting section 23 of the lift limiter 20 will be referred to as the head of the back plate. Please refer toFigure 9 , the backplate oil film pressure (F p2 ) satisfies the following formula:

[0065]

[0066] From the above formula, it can be seen that the backplate oil film pressure is positively correlated with the size R min of the head portion (i.e., the lift limiter portion 23) of the backplate and is negatively correlated with the size R beio of the hole 232 in the head portion of the backplate. The smaller the size R min , the smaller the oil film viscosity, and the larger the size R beio , the smaller the oil film viscosity. That is, by providing the hole 232 in the middle of the head portion of the backplate, the contact area of the head portion of the backplate with the valve plate 10 can be reduced, and thus the oil film viscosity can be reduced.

[0067] It is considered that the contact stress when the valve plate 10 contacts the backplate (i.e., the lift limiter 20) cannot be too large so as to damage the valve plate 10. The ratio of the area of the head portion (i.e., the lift limiter portion 23) of the backplate to the area of the head portion 13 of the valve plate 10 needs to be designed to a proper value. In one embodiment, the ratio of the area of the lift limiter portion 23 to the area of the head portion 13 of the valve plate 10 is not less than 10% and not more than 90%. For example, the ratio of the area of the lift limiter portion 23 to the area of the head portion 13 of the valve plate 10 can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or any value between 10% and 90%. Alternatively, the ratio of the area of the lift limiter portion 23 to the area of the head portion 13 of the valve plate 10 is not less than 20% and not more than 60%. For example, the ratio can be 48%.

[0068] The following is a specific derivation process: the area of the head portion 13 of the valve plate 10 is Afapian, the thickness is Thfapian, and the density of the valve plate 10 is roufapian, so the mass of the head portion 13 of the valve plate 10 is mfapian=Afapian*Thfapian*roufapian.

[0069] The speed of the valve plate 10 when it hits the backplate is v, and the valve plate 10 rebounds after a time of dt, so the impact force of the valve plate 10 on the backplate is F=2*mfapian*v / dt, and the area of the head portion of the backplate is Abeiban, so the impact pressure of the valve plate 10 on the backplate is P=F / Abeiban.

[0070] The impact of the valve plate 10 on the backplate causes an impact stress in the valve plate 10, which is proportional to the impact pressure, so the impact stress sigma=k*P, where k is a coefficient related to the geometry of the valve plate 10 and the stress distribution. In order for the valve plate 10 not to be damaged, sigma needs to be less than the fatigue limit S of the material of the valve plate 10, so sigma<S.

[0071] In summary, Abeiban / Afapian>2*k*Thfapian*roufapian*v / (dt*S).

[0072] Therefore, taking comprehensive considerations to reduce the viscosity of the lubricating oil in the back plate head part on the valve plate 10 and the reliability of the valve plate 10 itself, the ratio of the area of ​​the back plate head part to the area of ​​the head part 13 of the valve plate 10 Abeiban / Afapian should be equal to 2*k*Thfapian*roufapian*v / (dt*S).

[0073] For example, taking typical values, k = 1000, Thfapian = 0.305 mm, roufapian = 7850 kg / m^3, v = 4 m / s, dt = 0.1 ms, S = 400 MPa, then Abeiban / Afapian = 48%. For various valve plates 10, a practical design range of 10% is appropriate.

[0074] like Figure 10 Figure 2 shows a schematic diagram of the valve disc lift-time curves for a conventional lift limiter (referred to as the conventional backplate in the figure) and a lift limiter 20 according to an embodiment of the present invention (referred to as the oil-guided backplate in the figure). The figure shows that the closing speed of the valve disc 10 of the oil-guided backplate is significantly greater than that of the conventional backplate, while the opening speed of the valve disc 10 of the oil-guided backplate is greater than that of the conventional backplate at the highest point of opening. Lift refers to the height raised above the center of the head 13 of the valve disc 10. Experimental results have confirmed that the lift limiter 20 according to the present invention can increase the opening and closing speed of the valve disc 10, enhancing its rapid opening and closing performance.

[0075] like Figure 2 and Figure 3 As shown, the present invention also proposes an exhaust valve 100, which includes a valve disc 10 and a lift limiter 20. The valve disc 10 has a mounting portion 11, an intermediate portion 12, and a head portion 13 connected in sequence along the length direction. The lift limiter 20 is arranged on the side of the valve disc 10 facing away from the exhaust hole. The mounting section 21 is fixedly connected to the mounting portion 11, the transition section 22 is corresponding to the intermediate portion 12, and the lift limiter section 23 is corresponding to the head portion 13. When the valve disc 10 closes the exhaust hole, a gap is formed between the lift limiter section 23 and the head portion 13. The specific structure of the lift limiter 20 refers to the above-mentioned embodiments. Since the exhaust valve 100 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here.

[0076] The exhaust valve 100 of the present application is provided with an oil guiding structure on the side of the transition section 22 of the lift limiter 20 facing the valve plate 10, which is used to guide the lubricating oil between the transition section 22 and the valve plate 10 to move in the second direction. In this way, at least part of the lubricating oil between the valve plate 10 and the transition section 22 will move in the second direction under the guidance of the oil guiding structure during the lifting of the valve plate 10. Since the second direction is different from the first direction, the movement of the lubricating oil in the first direction between the lift limiting section 23 and the head 13 of the valve plate 10 can be reduced or prevented, thereby reducing the amount of oil stored between the lift limiting section 23 and the head 13 of the valve plate 10, and reducing the sticking effect between the valve plate 10 and the lift limiter 20, thereby improving the fast opening and closing performance of the valve plate 10. When the exhaust valve 100 is applied to a compressor, the valve plate 10 can be closed in time after the compressor exhausts, avoiding backflow of refrigerant, thereby ensuring the performance of the compressor.

[0077] The present application also provides a compressor comprising the exhaust valve 100, the specific structure of which is referred to the above embodiments. Since the compressor adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0078] The present application also provides a refrigeration equipment comprising the compressor, the specific structure of which is referred to the above embodiments. Since the refrigeration equipment adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The refrigeration equipment includes but is not limited to air conditioners, refrigerators, cold chain vehicles, etc.

[0079] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by referring to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A lift limiter for being disposed on one side of a valve plate, characterized by, The lift limiter comprises a mounting section, a transition section and a lift limiting section connected in a first direction, the mounting section is used for connecting with a mounting portion of the valve plate, the lift limiting section is used for limiting the maximum lift of a head portion of the valve plate, the transition section is provided with a guide oil structure towards a side of the valve plate, the guide oil structure is used for guiding the movement of lubricating oil between the transition section and the valve plate in a second direction, the second direction is different from the first direction.

2. The lift limiter of claim 1, wherein The guide oil structure comprises at least one guide oil groove recessed in the transition section.

3. The lift limiter of claim 2, wherein The guide oil groove has at least one oil discharge port penetrating a side wall of the lift limiter.

4. The lift limiter of claim 3, wherein The oil discharge port is located on one side of the lift limiter in the width direction, and the guide oil groove further has a guide inclined surface which is arranged to extend obliquely from bottom to top towards the side close to the oil discharge port in the height direction of the lift limiter.

5. The lift limiter of claim 4, wherein The slope of the guide inclined surface is greater than 0 and less than or equal to tan75°.

6. The lift limiter of claim 4, wherein The guide oil structure comprises two guide oil grooves arranged in the width direction of the lift limiter, each guide oil groove is provided with the oil discharge port away from one side of the other guide oil groove, and each guide oil groove is provided with the guide inclined surface close to one side of the other guide oil groove, and the two guide inclined surfaces are arranged at an included angle.

7. The lift limiter of claim 6, wherein The included angle between the two guide inclined surfaces is greater than or equal to 30° and less than 180°.

8. The lift limiter of claim 6, wherein The intersection of the two guide inclined surfaces is provided with a convex portion extending in the first direction, the mounting section has a first limiting surface towards the valve plate, the convex portion has a second limiting surface towards the valve plate, and the lift limiting section has a third limiting surface towards the valve plate, and the first limiting surface, the second limiting surface and the third limiting surface are continuously connected and gradually raised upwards in the first direction.

9. The lift limiter of claim 8, wherein The width of the second limiting surface is not less than 0.5mm and not more than 2mm.

10. The lift limiter of claim 3, wherein The guide oil groove has two oil discharge ports penetrating two side walls in the width direction of the lift limiter.

11. The lift limiter of claim 10, wherein The guide oil groove is provided with a plurality of guide oil grooves arranged at intervals in the first direction.

12. The lift limiter of any one of claims 1 to 11, wherein, The lift limiting section is provided with a hole towards the valve plate. The ratio of the area of the lift limiting section to the area of the head portion of the valve plate is not less than 10% and not more than 90%.

13. An exhaust valve characterized by, It comprises: The valve plate has a mounting portion, an intermediate portion and a head portion connected in sequence in the length direction; And The lift limiter according to any one of claims 1 to 12 is arranged on the side of the valve plate away from the exhaust hole, the mounting section is fixedly connected with the mounting portion, the transition section is arranged correspondingly with the intermediate portion, the lift limiting section is arranged correspondingly with the head portion, and when the valve plate closes the exhaust hole, a gap is formed between the lift limiting section and the head portion.

14. A compressor characterized by, It comprises the exhaust valve according to claim 13.

15. A refrigeration appliance characterized in that, It comprises the compressor according to claim 14.

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