Valve plate, compressor, refrigeration equipment and temperature adjusting system

Abstract

The utility model discloses a valve plate, a compressor, refrigeration equipment and a temperature adjusting system. The valve plate provided by the utility model is subjected to shot peening strengthening treatment on the basis of an original valve plate, so that processing defects on the surface of the original valve plate can be effectively eliminated, the surface condition of the original valve plate is improved, and the fatigue life of the valve plate is prolonged. The surface roughness of the valve plate after shot blasting is small, the shot blasting strengthening depth can be greatly shortened, the depth of a single-side shot blasting strengthening layer is smaller than 1 / 3 of the thickness of an original valve plate, the deformation amount of the valve plate is reduced, the phenomenon of over-blasting is avoided, the deformation problem and the over-blasting problem caused by shot blasting are effectively solved, the valve plate is suitable for the characteristics of valve plate products, and the service life of the valve plate is prolonged. The fatigue life of the valve plate is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valve plates, in particular to a valve plate, a compressor, a refrigeration device and a temperature regulating system. Background Art

[0002] The valve plate is one of the most core components of various compressors (such as air-conditioning compressors, ice compressors, etc.), and is called the heart of the compressor. The valve plate needs to have the characteristics of high strength, high hardness, high wear resistance, high fatigue, and high corrosion resistance. Among them, fatigue life is the most important indicator of the valve plate. With the increase in product demand, the fatigue life of the valve plate also tends to develop in the direction of long life. Due to the high technical barriers of the raw materials of the valve plate and the difficulty in changing them, the current measures to improve the life of the valve plate are mainly from two aspects: structural optimization (such as optimization of the valve plate profile and thickness) and setting buffer devices (such as adding plastic gaskets). However, the above methods all have obvious disadvantages: for structural optimization, the current valve plate is mainly cut from the original material, the thickness is not easy to adjust, and the valve plate structure has become stable after years of iteration, and there is little room for modification; for the setting of buffer devices, the production cost is increased, and the installation process is increased, and the production efficiency is reduced.

[0003] Therefore, providing a valve plate with a long fatigue life becomes an urgent problem to be solved. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a valve plate, a compressor, a refrigeration device and a temperature control system, aiming to solve the problem of valve plates that urgently need a long fatigue life.

[0005] An embodiment of the first aspect of the utility model provides a valve sheet, comprising an original valve sheet and a shot peening strengthening layer formed on the surface of the original valve sheet; the thickness of the original valve sheet is 0.152mm~1.0mm, and the thickness of the shot peening strengthening layer is less than 1 / 3 of the thickness of the original valve sheet.

[0006] The valve disc according to the embodiment of the first aspect of the utility model has at least the following beneficial effects: the valve disc provided by the utility model has been shot peened on the basis of the original valve disc, which can effectively eliminate the processing defects on the surface of the original valve disc, such as holes, processing lines, etc., improve the surface condition of the original valve disc, and thus increase the fatigue life of the valve disc. The surface roughness of the valve disc after shot peening is only increased by about 0.1 (Ra) compared to the roughness without shot peening, which can reduce the risk of gas leakage caused by the surface roughness after traditional shot peening. In addition, the shot peening depth of the utility model is greatly shortened, and the thickness of the single-sided shot peening layer is less than 1 / 3 of the thickness of the original valve disc, which effectively solves the deformation and overspray problems caused by shot peening. The above changes have increased the fatigue life of the valve disc, adapted to the characteristics of the valve disc product, and are expected to realize the industrial application of the valve disc shot peening process.

[0007] In some embodiments of the present invention, the surface residual compressive stress of the valve plate is greater than -800 MPa.

[0008] In some embodiments of the present invention, the roughness of the valve sheet is less than 0.35 μm.

[0009] In some embodiments of the present invention, the thickness of the shot peening strengthening layer is less than 0.3 mm.

[0010] In some embodiments of the present invention, the thickness of the shot peening strengthening layer is less than 0.05 mm.

[0011] In some embodiments of the present invention, the surface of the original valve plate includes a first surface and a second surface; the shot peening layer includes a first shot peening layer formed on the first surface, and a second shot peening layer formed on the second surface.

[0012] In some embodiments of the present invention, the material of the original valve plate is selected from martensitic stainless steel.

[0013] In some embodiments of the present invention, the original valve sheet is an integrally formed part.

[0014] The embodiment of the second aspect of the present utility model provides a valve plate shot peening strengthening method, comprising the steps of:

[0015] S1. Provide a magnetic base, and place the original valve sheet to be shot peened on the magnetic base;

[0016] S2, performing shot peening on the first surface of the original valve sheet to form a first shot peening strengthening layer to obtain a semi-finished valve sheet;

[0017] S3, turning over the semi-finished valve sheet, and placing it on the magnetic base again, so that the first shot peening layer is in contact with the magnetic base;

[0018] S4, performing shot peening on the second surface of the semi-finished valve sheet to form a second shot peening strengthening layer, thereby obtaining a shot peening strengthened valve sheet;

[0019] The thickness of the first shot peening layer and the second shot peening layer are both less than 1 / 3 of the thickness of the original valve plate, and the surface residual compressive stress of the shot peening valve plate is greater than -800 MPa.

[0020] The valve plate shot peening strengthening method according to the embodiment of the second aspect of the utility model has at least the following beneficial effects: the shot peening strengthening method provided by the utility model abandons the traditional clamping method with a clamp, and adopts a magnetic fixing method, placing one side of the original valve plate above the magnetic base, and fixing the original valve plate with the magnetic force, and performing shot peening on the side; after the shot peening of one side is completed, it only needs to be flipped to the other side facing up, and the other side can be shot peened. Since the magnetic device does not require a clamp to fix the valve plate, the generation of a shot peening obstruction area is avoided, and full shot peening coverage of the valve plate can be achieved. This method is easy to install, solves the clamping and deformation problems of the valve plate during shot peening, and there are no obstructions during the shot peening process, so full-size shot peening coverage of the valve plate can be achieved.

[0021] In some embodiments of the present invention, the shot peening parameters of the shot peening treatment are: pressure 0.1-0.2 MPa, shot flow rate 1.0-2.0 kg / min, shot peening distance 200-400 mm, shot peening angle 45°-90°, and shot peening scanning speed 10-50 mm / s.

[0022] In some embodiments of the present invention, the pellets used in the shot peening process include ceramic-based pellets.

[0023] In some embodiments of the present invention, the particle size (D50) of the pellets is 10 to 200 μm.

[0024] In some embodiments of the present invention, the particle size (D50) of the pellets is 10 to 80 μm.

[0025] In some embodiments of the present invention, the hardness of the pellets is greater than 1000 HV.

[0026] In some embodiments of the present invention, the hardness of the pellets is 1000-1800 HV.

[0027] In some embodiments of the present invention, the material of the original valve plate is selected from martensitic stainless steel.

[0028] In some embodiments of the present invention, the surface residual compressive stress of the valve plate strengthened by shot peening is -800Mpa to -1000Mpa.

[0029] In some embodiments of the present invention, the magnetic base is selected from any one of a permanent magnet, an electromagnet or a magnetic strip.

[0030] An embodiment of the third aspect of the utility model provides application of the valve plate as described above in a compressor.

[0031] According to the application of the third aspect of the utility model, at least the following beneficial effects are achieved: the valve plate is one of the core components of various compressors, which is required to have high strength, high hardness, high wear resistance, high fatigue, high corrosion resistance and other characteristics, among which fatigue life is the most important indicator of the valve plate. The valve plate provided by the utility model can effectively eliminate the processing defects existing on the surface of the original valve plate, improve the surface condition of the original valve plate, and increase the fatigue life of the valve plate. It is applied to compressors and has extremely high industrial promotion value.

[0032] An embodiment of a fourth aspect of the utility model provides a compressor, comprising the valve plate as described above.

[0033] The compressor according to the embodiment of the fourth aspect of the utility model has at least the following beneficial effects: the compressor provided by the utility model adopts the above-mentioned valve plate, and therefore also has the technical effects described above, the fatigue life of the valve plate is improved, and the service life of the compressor is correspondingly improved.

[0034] An embodiment of the fifth aspect of the utility model provides a refrigeration device, comprising the compressor as described above.

[0035] The refrigeration equipment according to the embodiment of the fifth aspect of the utility model has at least the following beneficial effects: the refrigeration equipment provided by the utility model, the core component of which is the compressor described above, and therefore also has the technical effects described above, the fatigue life of the valve plate is improved, and the service life of the compressor is correspondingly improved, further improving the service life of the refrigeration equipment.

[0036] In some embodiments of the present invention, the refrigeration equipment includes a refrigerator, a wall mounted air conditioner, a cabinet air conditioner or a ceiling mounted air conditioner.

[0037] An embodiment of the sixth aspect of the utility model provides a temperature control system, comprising the compressor as described above.

[0038] According to the temperature control system of the sixth aspect embodiment of the utility model, there are at least the following beneficial effects: the temperature control system provided by the utility model, the core component is the compressor mentioned above, and therefore it also has the technical effects mentioned above, the fatigue life of the valve plate is improved, and the service life of the compressor is correspondingly improved, further improving the service life of the temperature control system.

[0039] In some embodiments of the present invention, the temperature adjustment system includes a heating equipment adjustment system and a refrigeration equipment adjustment system.

[0040] In some embodiments of the present invention, the temperature adjustment system includes a constant temperature control system.

[0041] In some embodiments of the present invention, the temperature regulation system includes an incubator.

[0042] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the valve plate structure provided by an embodiment of the utility model;

[0044] Figure 2 It is a schematic diagram of the valve plate shot peening strengthening process provided by the embodiment of the utility model;

[0045] Figure 3 It is a schematic diagram of the surface morphology of the valve plate before shot peening provided by an embodiment of the utility model;

[0046] Figure 4 It is a schematic diagram of the surface morphology of the valve plate after shot peening provided by an embodiment of the utility model;

[0047] Figure 5 It is a schematic diagram of the original valve sheet provided by the embodiment of the utility model;

[0048] Among them, 100-original valve plate, 200-first shot peening strengthening layer, 300-second shot peening strengthening layer, 400-magnetic base, 500-spray gun, 600-shot particles. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the concept and technical effects of the utility model in combination with the embodiments, so as to fully understand the purpose, features and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model.

[0050] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] In the description of the present invention, unless otherwise specified, the numerical range "a-b" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. Unless otherwise specified, each reaction or operation step can be carried out in sequence or not. Preferably, the reaction method in the present invention is carried out in sequence.

[0052] If no specific techniques or conditions are specified in the following examples, the techniques or conditions described in the literature in the art or the product instructions are used. All reagents or instruments without manufacturer specified are conventional products that can be purchased commercially.

[0053] The first aspect of the utility model provides a valve plate, comprising an original valve plate and a shot peening strengthening layer formed on the surface of the original valve plate; the thickness of the original valve plate is 0.152mm-1.0mm, and the thickness of the shot peening strengthening layer is less than 1 / 3 of the thickness of the original valve plate.

[0054] Shot peening refers to a surface strengthening technology that improves the fatigue performance of the metal surface by spraying high-speed pellets on the metal surface. It is considered to be a low-cost and high-efficiency process for improving the fatigue life of workpieces and has been widely used in various mechanical parts, such as gears, shafts, and blades. However, unlike the above parts, the valve plate is not easy to clamp during shot peening due to its small size and thin thickness (as low as 0.152mm), which makes it easy to produce shielding areas and deform after shot peening. The above reasons also lead to the fact that the shot peening process has not been widely used in valve plates at present, and it does not have the conditions for industrial application. Deformation control is the biggest technical difficulty in valve plate shot peening. Because the valve plate is very thin, the depth of the shot peening layer produced by traditional shot peening (referring to the effective depth of residual stress on the surface of the sample along the thickness direction after shot peening) is usually between hundreds of microns and several millimeters, which will cause serious deformation of the valve plate and produce "overspray" phenomenon. At this time, the depth of the shot peening layer is too large, and the valve plate will become brittle as a whole, which will reduce the fatigue life. The valve plate of the utility model is designed with a single-side shot peening layer with a depth less than 1 / 3 of the thickness of the original valve plate, which greatly shortens the depth of the shot peening layer, thereby reducing the deformation of the valve plate.

[0055] In some embodiments of the present invention, the thickness of the original valve sheet is 0.152 mm to 1.0 mm, for example, 0.152 mm / 0.2 mm / 0.25 mm / 0.3 mm / 0.4 mm / 0.5 mm / 0.6 mm / 0.7 mm / 0.8 mm / 0.9 mm / 1.0 mm.

[0056] In some embodiments of the present invention, the thickness of the shot peening layer is less than 1 / 3 of the thickness of the original valve plate.

[0057] In some embodiments of the present invention, the thickness of the shot peening layer is less than 0.3 mm.

[0058] Preferably, the thickness of the shot peening layer is 0.1 to 0.3 mm.

[0059] Preferably, the thickness of the shot peening layer is 0.2 to 0.3 mm.

[0060] Preferably, the thickness of the shot peening layer is 0.1 to 0.2 mm.

[0061] In some embodiments of the present invention, the thickness of the shot peening layer is less than 0.1 mm.

[0062] Preferably, the thickness of the shot peening layer is 0.05 to 0.1 mm.

[0063] In some embodiments of the present invention, the thickness of the shot peening layer is less than 0.05 mm.

[0064] Preferably, the thickness of the shot peening layer is 0.03 to 0.05 mm.

[0065] Since the valve plate is very thin, if the depth of the shot peening layer is too large, the valve plate will be severely deformed. If the depth of the shot peening layer is too large, the valve plate will become brittle as a whole, which will reduce the fatigue life. The valve plate of the utility model is designed with a single-side shot peening layer depth less than 1 / 3 of the original valve plate thickness, which greatly shortens the depth of the shot peening layer, thereby reducing the deformation of the valve plate.

[0066] In order to reduce the deformation of the valve plate and avoid the "overspray" phenomenon, the depth of the single-sided shot peening layer designed by the utility model is less than 1 / 3 of the original valve plate thickness. The thickness of the commonly used compressor valve plates is generally: 0.152mm / 0.2mm / 0.25mm / 0.3mm / 0.4mm / 0.5mm / 0.6mm / 0.7mm / 0.8mm / 0.9mm / 1.0mm. The utility model is applicable to various types of valve plates, and only needs to meet the requirement that the thickness of the single-sided shot peening layer is less than 1 / 3 of the above valve plate thickness. For example, when the valve plate thickness is 0.9mm / 1.0mm, the thickness of the single-sided shot peening layer can be 0.2-0.3mm; when the valve plate thickness is 0.6mm / 0.7mm / 0.8mm, the thickness of the single-sided shot peening layer can be 0.1-0.2mm; when the valve plate thickness is 0.3mm / 0.4mm / 0.5mm, the thickness of the single-sided shot peening layer can be 0.05-0.1mm; when the valve plate thickness is 0.152mm / 0.2mm / 0.25mm, the thickness of the single-sided shot peening layer can be 0.03-0.05 or lower. For example, for a valve plate with a standard thickness of 0.152mm, the thickness of the single-sided shot peening layer must be less than 0.05mm.

[0067] In some embodiments of the present invention, the surface residual compressive stress of the valve plate is greater than -800 MPa. The surface shot peening residual compressive stress of the valve plate of the present invention is much higher than the surface residual compressive stress of the original valve plate of about -200 MPa. The introduction of residual compressive stress on the surface of the valve plate can inhibit the generation of fatigue cracks and improve the fatigue life of the valve plate within a certain range.

[0068] In some embodiments of the present invention, the surface residual compressive stress of the valve plate is -800 to -1000 MPa.

[0069] In some embodiments of the present invention, the roughness of the valve plate is less than 0.35 μm. The surface roughness of the valve plate after shot peening in the present invention is only increased by about 0.1 (Ra) compared with the roughness without shot peening, which can reduce the risk of gas leakage caused by the surface roughness after traditional shot peening.

[0070] In some embodiments of the present invention, the surface of the original valve sheet includes a first surface and a second surface; the shot peening layer includes a first shot peening layer formed on the first surface and a second shot peening layer formed on the second surface. In the present invention, shot peening is performed on both surfaces of the original valve sheet to form two shot peening layers, both of which are parallel to the surface of the original valve sheet.

[0071] In some embodiments of the present invention, the material of the original valve plate is selected from martensitic stainless steel. Martensitic stainless steel has ferromagnetism and can be easily fixed by magnetic attraction.

[0072] In some embodiments of the present invention, the original valve sheet is an integrally formed part.

[0073] Figure 1 The figure is a schematic diagram of the valve plate structure in a specific embodiment of the utility model, wherein 100 is the original valve plate, 200 is the first shot peening strengthening layer, 300 is the second shot peening strengthening layer, and the upper and lower surfaces of the original valve plate 100 are both shot peening strengthened to form a first shot peening strengthening layer 200 and a second shot peening strengthening layer 300 which are parallel to the surface of the original valve plate and uniform.

[0074] In order to solve the problems existing in the current valve plate shot peening process, such as the valve plate being difficult to clamp, generating a shielding area, being prone to deformation, and "overspraying", the second aspect of the utility model provides a valve plate shot peening method, comprising the steps of:

[0075] S1. Provide a magnetic base and place the original valve plate to be shot peened on the magnetic base;

[0076] S2, performing shot peening on the first surface of the original valve sheet to form a first shot peening strengthening layer to obtain a semi-finished valve sheet;

[0077] S3, turning over the semi-finished valve sheet and placing it on the magnetic base again, so that the first shot peening layer is in contact with the magnetic base;

[0078] S4, performing shot peening on the second surface of the semi-finished valve sheet to form a second shot peening strengthening layer, thereby obtaining a shot peening strengthened valve sheet;

[0079] The thickness of the first shot peening layer and the second shot peening layer are both less than 1 / 3 of the thickness of the original valve plate, and the surface residual compressive stress of the shot peening valve plate is greater than -800 MPa.

[0080] In some embodiments of the present invention, the thickness of the original valve sheet is 0.152 mm to 1.0 mm.

[0081] In some embodiments of the present invention, the shot peening parameters of the shot peening treatment are: pressure 0.1-0.2 MPa, shot flow rate 1.0-2.0 kg / min, shot peening distance 200-400 mm, shot peening angle 45°-90°, and shot peening scanning speed 10-50 mm / s.

[0082] The shot peening method provided by the utility model abandons the traditional clamping method with a clamp, and adopts a magnetic fixing method. One side of the original valve plate is placed above the magnetic base, and the original valve plate is fixed by magnetic suction, and the side is shot peened; after the shot peening of one side is completed, it only needs to be turned over to the other side facing up to perform the shot peening of the other side. Since the magnetic device does not need a clamp to fix the valve plate, the generation of the shot peening shielding area is avoided, and the full shot peening coverage of the valve plate can be achieved. The method is easy to install, solves the clamping and deformation problems of the valve plate during shot peening, and there are no obstructions during the shot peening process, so the full-size shot peening coverage of the valve plate can be achieved. In addition, the shot peening process of the utility model reasonably selects the characteristic parameters of the shot particles, and the shot particles used have high hardness and small particle size, which reduces the deformation of the valve plate, avoids the "overspray" phenomenon, and effectively solves the deformation and overspray problems caused by shot peening. The above two changes adapt to the characteristics of the valve plate product and are expected to realize the industrial application of the valve plate shot peening process. Moreover, the shot peening method of the utility model is applicable to valve plates of various types, and the thickness of the single-side shot peening strengthening layer after shot peening can reach less than 1 / 3 of the original valve plate thickness.

[0083] Figure 2 The figure shows a schematic diagram of the valve plate shot peening process in a specific embodiment of the utility model, wherein 100 is the original valve plate, 400 is the magnetic base, 500 is the spray gun, and 600 is the pellets. As shown in the figure, the original valve plate 100 is fixed on the magnetic base 400, and the magnetic fixing method is adopted. There is no need for a clamp to fix the valve plate, which avoids the generation of a shot peening shielding area and can achieve full coverage of the valve plate by shot peening. After setting the parameters, the pellets 600 are sprayed out from the spray gun 500 to shot peen one side of the original valve plate; after the shot peening is completed, it only needs to be flipped to the other side facing up to perform shot peening on the other side.

[0084] Figure 3-4 The figure shows the surface morphology of the valve plate before and after shot peening in a specific embodiment of the utility model. Figure 3 The original valve plate before shot peening, although it has been tumbled, still has obvious processing defects on the surface, such as holes, processing lines, etc. These defective parts are often fatigue-sensitive parts, which are prone to fatigue cracks. The shot peening process provided by the utility model can effectively eliminate the above defects. The surface morphology of the valve plate after the shot peening treatment is as follows Figure 4 It can be seen that the surface condition of the valve plate is improved and the fatigue life of the valve plate is further improved.

[0085] In some embodiments of the present invention, the pellets used in the shot peening process include ceramic-based pellets. The ceramic-based pellets have a high hardness, with a hardness of HV1000 or more, which can meet the requirements of the present invention for pellet hardness.

[0086] In some embodiments of the present invention, the particle size (D50) of the pellets is 10 to 200 μm.

[0087] In some preferred embodiments of the present invention, the particle size (D50) of the pellets is 10 to 100 μm.

[0088] Preferably, the particle size (D50) of the pellets is 10 to 60 μm.

[0089] Preferably, the particle size (D50) of the pellets is 60 to 100 μm.

[0090] In some preferred embodiments of the present invention, the particle size (D50) of the pellets is 10 to 80 μm.

[0091] In some embodiments of the present invention, the hardness of the pellets is greater than 1000 HV.

[0092] In some preferred embodiments of the present invention, the hardness of the pellets is 1000-1800 HV.

[0093] Preferably, the hardness of the pellets is 1000-1500 HV.

[0094] Preferably, the hardness of the pellets is 1500-1800 HV.

[0095] In some embodiments of the present invention, the WC (tungsten carbide) content of the pellets is not less than 50%.

[0096] Preferably, the WC content of the pellets is 50% to 90%.

[0097] Preferably, the WC content of the pellets is 50% to 65%.

[0098] Preferably, the WC content of the pellets is 65% to 90%.

[0099] The shot particles of shot peening are an important factor affecting the shot peening effect. For different workpieces to be peened, selecting shots with reasonable characteristic parameters is the key to ensuring the quality of shot peening. The particle size (D50) of the shots used in traditional shot peening is generally 0.2-1mm, and the material is steel, glass, etc., and its hardness is mostly in the range of 50HRC to 65HRC. Deformation control is the biggest technical difficulty in valve plate shot peening. Since the valve plate is very thin, the use of traditional shot peening will cause serious deformation of the valve plate and produce "overspray". The valve plate will become brittle as a whole, which will reduce fatigue life. The utility model adopts ceramic-based shots with a hardness of HV1000 or more and a particle size (D50) of less than 200μm. The high hardness and small particle size shots can greatly reduce the deformation of the valve plate and avoid the "overspray" phenomenon, effectively solving the deformation and overspray problems caused by shot peening.

[0100] In some embodiments of the present invention, the thickness of the first shot peening layer is less than 0.3 mm.

[0101] Preferably, the thickness of the first shot peening layer is 0.1-0.3 mm.

[0102] Preferably, the thickness of the first shot peening layer is 0.2-0.3 mm.

[0103] Preferably, the thickness of the first shot peening layer is 0.1-0.2 mm.

[0104] In some embodiments of the present invention, the thickness of the first shot peening layer is less than 0.1 mm.

[0105] Preferably, the thickness of the first shot peening layer is 0.05-0.1 mm.

[0106] In some embodiments of the present invention, the thickness of the first shot peening layer is less than 0.05 mm.

[0107] Preferably, the thickness of the first shot peening layer is 0.03-0.05 mm.

[0108] In some embodiments of the present invention, the thickness of the second shot peening layer is less than 0.3 mm.

[0109] Preferably, the thickness of the second shot peening layer is 0.1-0.3 mm.

[0110] Preferably, the thickness of the second shot peening layer is 0.2-0.3 mm.

[0111] Preferably, the thickness of the second shot peening layer is 0.1-0.2 mm.

[0112] In some embodiments of the present invention, the thickness of the second shot peening layer is less than 0.1 mm.

[0113] Preferably, the thickness of the second shot peening layer is 0.05-0.1 mm.

[0114] In some embodiments of the present invention, the thickness of the second shot peening layer is less than 0.05 mm.

[0115] Preferably, the thickness of the second shot peening layer is 0.03-0.05 mm.

[0116] Deformation control is the biggest technical challenge of valve plate shot peening. As the valve plate is very thin, the use of traditional shot peening will cause serious deformation of the valve plate and produce "overspray", which will make the valve plate brittle as a whole and reduce fatigue life. The shot peening process of the utility model reasonably selects the characteristic parameters of the shot, and the shot has high hardness and small particle size, which reduces the deformation of the valve plate and avoids the "overspray" phenomenon, effectively solving the deformation and overspray problems caused by shot peening.

[0117] In some embodiments of the present invention, the surface residual compressive stress of the valve plate strengthened by shot peening is greater than -800 MPa.

[0118] In some embodiments of the present invention, the surface residual compressive stress of the valve plate strengthened by shot peening is -800Mpa to -1000Mpa.

[0119] The shot peening residual compressive stress on the valve plate surface after shot peening of the utility model is greater than -800MPa, which is much higher than the surface residual compressive stress of the original valve plate of about -200MPa. The introduction of residual compressive stress on the valve plate surface can inhibit the generation of fatigue cracks; within a certain range, generally the higher the residual compressive stress, the longer the fatigue life.

[0120] In some embodiments of the present invention, the material of the original valve plate is selected from martensitic stainless steel.

[0121] In some embodiments of the present invention, the original valve sheet is an integrally formed part.

[0122] Figure 5 The figure shows a schematic diagram of the original valve plate in the embodiment of the utility model. Since the martensitic stainless steel material is ferromagnetic and can be easily fixed by magnetic attraction, the shot peening fixing method can be fixed by a magnetic attraction device, without the need for a clamp to fix the valve plate, thus avoiding the generation of a shot peening shielding area and achieving full shot peening coverage of the valve plate.

[0123] In some embodiments of the present invention, the magnetic base is selected from any one of a permanent magnet, an electromagnet or a magnetic strip.

[0124] Since most common metal valve discs are made of martensitic stainless steel, which is ferromagnetic and can be easily fixed by magnets. Therefore, the utility model adopts a magnetic fixing method, and the valve disc is placed above the magnetic base. The magnetic base can be a permanent magnet or an electromagnet. In industrial assembly line production, a magnetic strip can also be used instead. Since the magnetic device does not require a clamp to fix the valve disc, the generation of a shot peening shielding area is avoided, and the shot peening of the valve disc can be fully covered.

[0125] In a specific embodiment of the present invention, the valve plate shot peening method comprises the following steps:

[0126] (1) Place the original valve plate on the magnetic base, with one side of the valve plate facing downwards to be sucked by the magnetic base and the other side facing upwards for shot peening;

[0127] (2) selecting spherical pellets of ceramic-based materials, with a hardness of not less than HV1000, a particle size (D50) of 10 to 100 μm, and a chemical composition of the pellets satisfying that the WC content is not less than 50%;

[0128] (3) Select the shot peening parameters: pressure 0.1-0.2 MPa, flow rate 1.0-2.0 kg / min, shot peening distance 200-400 mm, shot peening angle 45°-90°, shot peening scanning speed 10-50 mm / s;

[0129] (4) Start shot peening according to the shot particles and parameters selected in steps (2) and (3). After one side of the valve plate is shot peened, the other side is replaced and shot peened using the same shot peening process.

[0130] A third aspect of the utility model provides application of the valve plate as described above in a compressor.

[0131] The valve plate is one of the core parts of various compressors. It is required to have high strength, high hardness, high wear resistance, high fatigue, high corrosion resistance and other characteristics. Among them, fatigue life is the most important indicator of the valve plate. The valve plate provided by the utility model can solve the clamping and deformation problems of the valve plate during shot peening, improve the fatigue life of the valve plate, and be applied to compressors, which has extremely high industrial promotion value.

[0132] A fourth aspect of the utility model provides a compressor, comprising the valve plate as described above.

[0133] The compressor provided by the utility model adopts the above-mentioned shot peening strengthened valve plate, and therefore also has the technical effects mentioned above, the fatigue life of the valve plate is improved, and the service life of the compressor is correspondingly improved.

[0134] A fifth aspect of the utility model provides a temperature control system, comprising the compressor as described above.

[0135] The temperature control system provided by the utility model has the compressor mentioned above as its core component, and therefore also has the technical effects mentioned above. The fatigue life of the valve plate is improved, which correspondingly also improves the service life of the compressor, and further improves the service life of the temperature control system.

[0136] A sixth aspect of the utility model provides a refrigeration device, comprising the compressor as described above.

[0137] The core component of the refrigeration equipment provided by the utility model is the compressor mentioned above, and therefore it also has the technical effects mentioned above. The fatigue life of the valve plate is improved, which correspondingly also improves the service life of the compressor, and further improves the service life of the refrigeration equipment.

[0138] In some embodiments of the present invention, the refrigeration equipment is mainly composed of four parts: a box, a refrigeration system, an electrical control system and accessories. Among them, the core component of the refrigeration system is a compressor. The types of compressors mainly include rotary compressors, centrifugal compressors, open compressors, closed compressors and reciprocating compressors. Reciprocating compressors have a piston, which moves in a cylinder.

[0139] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0140] Example 1

[0141] In this embodiment, the valve plate is subjected to shot peening treatment, and the steps are as follows:

[0142] (1) Place the original valve sheet (standard valve sheet with a thickness of 0.152 mm) on the magnetic base, with one side of the valve sheet facing downward and being sucked by the magnetic base, and the other side facing upward for shot peening;

[0143] (2) selecting ceramic-based material spherical pellets with a hardness of HV1515 (test standard GB / T 7997-2014), a particle size (D50) of 42 μm (test standard GB / T 41949-2022), and a WC content of 83% in the pellet chemical composition (test method ICP);

[0144] (3) Select the shot peening parameters: pressure 0.1-0.2 MPa, flow rate 1.0-2.0 kg / min, shot peening distance 200-400 mm, shot peening angle 45°-90°, shot peening scanning speed 10-50 mm / s;

[0145] (4) Start shot peening according to the shot particles and parameters selected in steps (2) and (3). After one side of the valve plate is shot peened, the other side is replaced and shot peened using the same shot peening process.

[0146] After the treatment is completed, a valve plate treated with shot peening is obtained.

[0147] Among them, the depth of the shot peening strengthening layer on one side of the valve plate is 0.01mm.

[0148] Example 2

[0149] The difference from Example 1 is that the depth of the single-side shot peening strengthening layer is 0.03 mm. The rest is the same as Example 1.

[0150] Example 3

[0151] The difference from Example 1 is that the depth of the single-side shot peening strengthening layer is 0.04 mm. The rest is the same as Example 1.

[0152] Example 4

[0153] The difference from Example 1 is that the depth of the single-side shot peening strengthening layer is 0.05 mm. The rest is the same as Example 1.

[0154] Example 5

[0155] The difference from Example 4 is that the pellet hardness is HV1350, the particle size (D50) is 77 μm, and the WC content in the pellet chemical composition is 75%. The rest is the same as Example 4.

[0156] Example 6

[0157] The difference from Example 4 is that the pellet hardness is HV1120, the particle size (D50) is 23 μm, and the WC content in the pellet chemical composition is 61%. The rest is the same as Example 4.

[0158] Comparative Example 1

[0159] The difference from Example 1 is that the depth of the single-side shot peening strengthening layer is 0.07 mm. The rest is the same as Example 1.

[0160] Comparative Example 2

[0161] The difference from Example 1 is that the depth of the single-side shot peening strengthening layer is 0.09 mm. The rest is the same as Example 1.

[0162] Comparative Example 3

[0163] The difference from Example 4 is that the pellets are stainless steel pellets with a hardness of HV451, a particle size (D50) of 136 μm, and no WC component. The rest is the same as Example 4.

[0164] Comparative Example 4

[0165] The difference from Example 4 is that the pellets are stainless steel pellets with a hardness of HV765, a particle size (D50) of 95 μm, and no WC component. The rest is the same as Example 4.

[0166] Comparative Example 5

[0167] This comparative example provides a standard valve sheet with a thickness of 0.152 mm, which is not subjected to shot peening treatment.

[0168] Fatigue tests were performed on Examples 1-6 and Comparative Examples 1-5 (using Midea valve plate high cycle fatigue test equipment, test standard: impact frequency 200Hz, lift 4.5mm, speed 7.2m / s, impact times 10 million times), and the pass rate was tested (5 samples were tested each time, 5 / 5 means that none of the 5 tested samples broke); and the deformation of the valve plate was observed, and it was stipulated that the valve plate warpage within 2 wires was qualified for deformation, and exceeding the tolerance was out of tolerance. The results are shown in Table 1-2:

[0169] Table 1

[0170]

[0171]

[0172] Table 2

[0173]

[0174] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A valve sheet, characterized in that: It includes an original valve sheet and a shot peening strengthening layer formed on the surface of the original valve sheet; the surface of the original valve sheet includes a first surface and a second surface; the shot peening strengthening layer includes a first shot peening strengthening layer formed on the first surface, and a second shot peening strengthening layer formed on the second surface; the thickness of the original valve sheet is 0.152mm~1.0mm, and the thickness of the shot peening strengthening layer is less than 1 / 3 of the thickness of the original valve sheet.

2. The valve sheet according to claim 1, characterized in that: The surface residual compressive stress of the valve plate is greater than -800Mpa.

3. The valve sheet according to claim 1, characterized in that: The roughness of the valve sheet is less than 0.35 μm.

4. The valve sheet according to claim 1, characterized in that: The thickness of the shot peening strengthening layer is less than 0.05 mm.

5. The valve sheet according to claim 1, characterized in that: The material of the original valve plate is selected from martensitic stainless steel.

6. The valve sheet according to claim 1, characterized in that: The original valve sheet is an integrally formed part.

7. A compressor, characterized in that: Comprising the valve sheet as described in any one of claims 1-6.

8. A refrigeration device, characterized in that: Comprising the compressor as claimed in claim 7.

9. A temperature control system, characterized in that: Comprising the compressor as claimed in claim 7.

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