A gas supplementing and enthalpy increasing structure and a compressor with the same

Abstract

The application provides a gas supplement and enthalpy increase structure and a compressor with the same, relates to the technical field of compressors, and solves the technical problem of a small gas supplement hole area, insufficient gas supplement amount and unsatisfactory enthalpy increase effect. The structure comprises a gas supplement hole, the injection port of the gas supplement hole is located at the inner cavity end face of a cylinder, one side of the injection port is connected with the compression cavity of the compressor, the other side of the injection port is connected with a gas supplement channel, the injection port is a special-shaped port, compared with a traditional circular injection port, the injection port area is increased in limited space, the gas supplement amount is sufficient, and the enthalpy increase effect is good; the injection port is composed of smooth curves, or the injection port is formed by the intersection of a plurality of curves, and the inner intersection angle of any two intersecting curves is greater than 180 degrees. The setting can realize numerical milling processing, the production efficiency is high, the batch production requirement is met, and the processing cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a gas supplementing and enthalpy increasing structure and a compressor with the same. BACKGROUND

[0002] When the existing compressor is used for low-temperature heating, the suction density of the refrigerant is small at a low evaporation temperature, which leads to serious attenuation of the heating capacity of the compressor at low temperature. The common method to solve the low-temperature attenuation of the compressor is gas supplementing technology.

[0003] The gas supplementing technology includes single-stage gas supplementing technology and two-stage gas supplementing technology. The two-stage gas supplementing technology is also called two-stage enthalpy increasing compressor, which has good gas supplementing effect but high cost and poor process performance. In particular, the displacement of the two cylinders of the two-stage compression is only the displacement of the primary cylinder, which limits the displacement of the compressor and seriously limits the use range of the displacement. In addition, in the use environment with small pressure ratio (such as summer refrigeration), the influence of the residual volume and other factors on the performance of the compressor is more obvious due to the existence of the two cylinders, which leads to low efficiency of the two-stage enthalpy increasing compressor under the condition of small pressure ratio. Therefore, the single-stage gas supplementing technology is widely used.

[0004] The present applicant finds that the prior art at least has the following technical problems:

[0005] For single-stage gas supplementing, the gas supplementing structure of the existing compressor will have gas backflow, refrigerant flow to the gas supplementing hole, or gas leakage between the upper and lower cylinders of the two-cylinder compression due to the structural limitations. If the above situations are to be avoided, the gas supplementing hole can only be very small, and the gas supplementing amount is insufficient. Moreover, the gas supplementing hole of the existing compressor is a circular hole, and the area of the circular enthalpy increasing hole is too small, which leads to poor enthalpy increasing effect. SUMMARY

[0006] The present application aims to provide a gas supplementing and enthalpy increasing structure and a compressor with the same to solve the technical problems of small area of the gas supplementing hole, insufficient gas supplementing amount, and poor enthalpy increasing effect in the prior art. The preferred technical solutions in the many technical solutions provided by the present application can produce many technical effects, which are described in detail below.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The gas supplementing and enthalpy increasing structure provided by the present application comprises a gas supplementing hole, the injection port of the gas supplementing hole is located at the end face of the inner cavity of the cylinder, one side of the injection port is connected to the compression chamber of the compressor, the other side of the injection port is connected to the gas supplementing channel, and the injection port is a special-shaped port. The injection port is composed of smooth curves, or the injection port is formed by the intersection of a plurality of curves, and the inner intersection angle of any two intersecting curves is greater than 180 degrees.

[0009] Optionally, the curvature of any point on the curve is K, and K≤2.

[0010] Optionally, the curvature K is ≤1.33.

[0011] Optionally, the injection port is composed of a waist-shaped hole.

[0012] Optionally, the injection port is composed of two intersecting waist-shaped holes, and the intersection of the two waist-shaped holes is a rounded transition.

[0013] Optionally, the large radius of the waist-shaped hole is R 外 , the small radius is R 内 , the outer radius of the roller is R, satisfying 0.95≤R 外 / R≤1.05, and 1mm≤R 外 -R 内 ≤3mm.

[0014] Optionally, the injection port is composed of two intersecting waist-shaped holes, and the intersection of the center lines of the two waist-shaped holes and the line connecting the center of the cylinder are used as the dividing line to divide the special-shaped port into two parts, one of which is close to the cylinder intake part, and the area S1 is greater than the area S2 of the other close to the cylinder exhaust part.

[0015] The present invention provides a compressor comprising a cylinder end cover, a cylinder, a roller, a crankshaft, an air supply channel and any of the above-mentioned air supply and enthalpy increase structures, and the air supply hole is opened on the cylinder end cover.

[0016] Optionally, the cylinder end cover is a lower flange, an upper flange or a partition of the compressor.

[0017] Optionally, all or part of the injection port is located within the rotation coverage area of ​​the inner circle of the roller.

[0018] Optionally, the injection port has an invalid area; the outer radius of the roller is R, the center distance between the roller center and the center of the cylinder end cover is e, and the circle with the center of the cylinder end cover as the center and (Re) as the radius is the calibration circle; the overlapping area of ​​the injection port and the calibration circle is the invalid area of ​​the injection port.

[0019] Optionally, the end portion of the crankshaft close to the eccentric portion radially extends to the outer contour line of the crankshaft, filling the high-pressure area of ​​the inner hole of the roller into a solid.

[0020] The present invention provides an air-supplying and enthalpy-increasing structure and a compressor having the same. The injection port of the air-supplying and enthalpy-increasing structure is located on the inner cavity end face of the cylinder. Since the injection port is a special-shaped port, compared with the traditional circular injection port, the injection port area is increased within a limited space, the air supply volume is sufficient, and the enthalpy-increasing effect is good; and the injection port is composed of a smooth curve, or the injection port is formed by the intersection of several curves and the internal intersection angle of any two intersecting curves is greater than 180°. Such an arrangement can realize CNC milling processing, has high production efficiency, meets mass production requirements, and thus reduces processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 these drawings without paying any creative work.

[0022] Figure 1 This is a structural diagram of a gas-supplementing and enthalpy-increasing structure provided by a specific embodiment of the present invention, in which the injection port is composed of two waist-shaped holes;

[0023] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure at the air-injection hole;

[0024] Figure 3 yes Figure 1 A schematic diagram of the enlarged structure of the middle injection port;

[0025] Figure 4 2 is a schematic structural diagram of a second air-supplementing and enthalpy-increasing structure provided by a specific embodiment of the present invention, in which the injection port is composed of a waist-shaped hole;

[0026] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure of the middle injection port;

[0027] Figure 6 2 is a schematic structural diagram of a third air-supplementing and enthalpy-increasing structure provided by a specific embodiment of the present invention, showing a case where the inner intersection angle of the two waist-shaped holes constituting the injection port is greater than 180 degrees;

[0028] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure of the middle injection port;

[0029] Figure 8 It is a structural schematic diagram of the injection port of the prior art solution 1;

[0030] Figure 9 It is a structural schematic diagram of the injection port of the prior art solution 2;

[0031] Figure 10 It is a schematic diagram of the structure of the injection port of Scheme 3;

[0032] Figure 11 Schematic diagram of the front cross-sectional structure of the injection port of the prior art solution 4;

[0033] Figure 12 Schematic diagram of the top cross-sectional structure of the injection port of the prior art solution 4;

[0034] Figure 13 yes Figure 12 A schematic diagram of the partially enlarged structure of the L part in the middle;

[0035] Figure 14 Schematic diagram of a yield structure of an injection port of a gas-supplementing and enthalpy-increasing structure provided by a specific embodiment of the present invention;

[0036] Figure 15 is a schematic diagram of the area S1 and area S2 of the injection port;

[0037] Figure 16 It is a structural schematic diagram of a compressor provided by a specific embodiment of the present invention;

[0038] Figure 17 This is a diagram showing the positional relationship between the eccentric portion of the crankshaft and the air supply hole of the present invention;

[0039] Figure 18 This is a positional relationship diagram of the prior art crankshaft eccentric portion, roller inner cavity and air supply hole.

[0040] In the figure, 1, air supply hole; 11, injection port; 111, ineffective area; 2, lower flange; 3, cylinder; 4, eccentric part of crankshaft; 41, inner hole of crankshaft; 5, air supply channel; 6, roller; 7, air supply connecting pipe; 8, inner hole cavity of roller; 9, air intake port; 10, exhaust port;

[0041] In the figure, 1' is the air filling hole in the prior art; 4' is the eccentric part of the crankshaft in the prior art; 8' is the inner hole cavity (high-pressure cavity) of the roller in the prior art. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0043] like Figures 1-5As shown, the application provides a gas supplementing and enthalpy increasing structure, a refrigerant injection port 11 of a gas supplementing hole 1 is located at an end face of an inner cavity of a cylinder 3, and one side is connected to a compression cavity of a compressor, and the other side is connected to a gas supplementing channel 5; the injection port 11 is a non-circular special-shaped hole; the injection port 11 is composed of smooth curves, that is, an inner intersection angle is equal to 180°, wherein, Figure 1 The injection port 11 is formed by two waist-shaped holes through a round corner transition, and an enlarged structure of the injection port 11 is shown in Figure 3 ; Figure 4 The injection port 11 is a waist-shaped hole, and an enlarged structure of the injection port 11 is shown in Figure 5 ; in addition, the injection port 11 is formed by intersection of a plurality of curves, and an inner intersection angle of any two intersecting curves is greater than 180°, Figure 6 The injection port 11 is formed by intersection of two waist-shaped holes, an inner intersection angle of two curves close to an axis is greater than 180°, and an inner intersection angle of two curves close to an outer edge is equal to 180°.

[0044] The injection port 11 of the gas supplementing and enthalpy increasing structure is located at the end face of the inner cavity of the cylinder 3, and since the injection port 11 is a special-shaped port, compared with a traditional circular injection port 11, the area of the injection port 11 is increased in limited space, the gas supplementing amount is sufficient, and the enthalpy increasing effect is good. If the inner intersection angle is less than 180°, the sharp corner place cannot be milled by a circular milling cutter, and only a wire cutting or electric spark machining mode can be used, so that batch production cannot be realized; and the inner intersection angle of the injection port 11 of the application is greater than or equal to 180°, so that numerical milling machining can be realized, the production efficiency is high, the batch production requirement is met, and the machining cost is reduced.

[0045] As shown in the following table, the machining costs of several gas supplementing holes 1 of the parts are compared. Structures of the injection ports 11 of schemes 1 to 4 are shown in Figures 8 to 13 , schemes 3, 5 and 6 are the schemes of the gas supplementing and enthalpy increasing structure of the application, and structures of the injection ports 11 are shown in Figure 5 and Figure 3 . As shown in Figure 8 , the inner intersection angles of the several curves constituting the injection port 11 in scheme 1 are all less than 180°, and the sharp corners formed can only be machined by a wire cutting or electric spark machining mode; as shown in Figure 9 , the inner intersection angles of two curves in scheme 2 are less than 180°, and the sharp corners formed can only be machined by a wire cutting or electric spark machining mode. The cost of scheme 4 in the several schemes is the highest, and is shown in Figures 11-13Because the air supplement hole is arranged on the lower flange, the air supplement hole is a blind hole, and the opening is very small (the radius is 0.25 mm), a very small milling cutter is required, the milling cutter is very easy to break, normal milling cutters cannot be used for machining, and only electric spark machining can be used, the machining beat is slow, and the cost is the highest. Although the air supplement holes 1 in the schemes 1 and 2 cannot be machined by using normal milling cutters, the air supplement holes 1 are through holes, can be machined by using wire cutting, the beat is faster than that in the scheme 4, the cost is lower than that in the scheme 4, but batch demand cannot be met. Figure 10 Although the inner intersection angles of the curves constituting the injection ports in the scheme 3 are all greater than 180 degrees, the radius of the round angle is 0.4 mm, a milling cutter with a diameter of 0.8 mm can be used for machining (belongs to the case of K≤2), the production efficiency is improved, but the milling cutter is easy to break due to the small diameter, and the cost is still high. The schemes 5 and 6 use milling cutters for machining, the production efficiency is high, batch demand can be met, and the cost is low.

[0046]

[0047] The curvature of any point on the curve constituting the injection port 11 is K, and K≤2. When the maximum value of the curvature of the curve is K, the diameter D of the milling cutter selected for machining is generally selected according to the principle that D=2 / K. When a milling cutter with a diameter D greater than or equal to 1 mm is used for machining, the production cost requirement can be met. When a milling cutter with a diameter less than 1 mm is used for machining, the machining beat is slow, and the cost is high. Therefore, when K≤2, a round milling cutter can be used for machining, instead of wire cutting or electric spark machining, so that the machining efficiency is greatly improved, batch production is realized, and the cost is greatly reduced.

[0048] As an optional implementation, the curvature of any point on the curve is K, and K≤1.33. When the diameter size D of the milling cutter is greater than or equal to 1.5 mm, the machining beat is further improved, the cost is reduced, and batch production is facilitated.

[0049] As an optional implementation, as shown in Figure 14 The injection port 11 of the air supplement and enthalpy increasing structure has an invalid area 111, and there is a design of opening a space for the injection port 11. That is, the injection port 11 arranged on the end cover has a part of the area that is always not opened during the rotation of the crank roller 6. The area swept by the minimum distance point of the roller 6 is a circle (also called a calibration circle: the roller 6 has a radius R, the center distance between the center of the roller and the center of the cylinder end cover is e, and the circle with the center of the cylinder end cover as the center and (R-e) as the radius is the calibration circle), and all points of the injection port 11 in the circle area are not exposed in the compression chamber of the cylinder 3. The injection port 11 arranged in this area is an invalid part. Figure 14The invalid region 111 is shown in the hatched part, which is the design of giving way. From the design, the region where the injection port 11 is always not opened will have a slight decrease in energy efficiency. Because the larger the injection port 11 is, the more gaseous refrigerant in the pressure fluctuation in the air supplement hole 1, and the pressure fluctuation consumes power. However, in order to realize processing, a small part of energy efficiency is sacrificed. Because the area where the enthalpy increasing hole (air supplement hole 1) can be opened is too small, the milling cutter cannot be too large, so that the normal efficiency is not high, the cost is too high, and mass production is not possible.

[0050] As an optional embodiment, the air supplement hole opened on the end cover is all or partially arranged in the rotation coverage area of the inner circle of the roller 6. Generally, most models do not have the condition to open the enthalpy increasing hole, or the area where the injection port 11 can be opened is small, such as Figure 18 , which cannot meet the setting of the above-mentioned special-shaped hole. Therefore, the high-pressure area of the original roller 6 inner hole is filled as a solid part or the high-pressure area of the original roller 6 inner hole is set as an air supplement pressure area.

[0051] Preferably, as shown in Figure 17 , the above-mentioned area is filled as a solid part through the change of the structure of the roller thrust surface and the crankshaft, so that the setting of the above-mentioned air supplement hole 1 is realized. During the rotation of the eccentric part of the crankshaft, the area part contacting the enthalpy increasing hole (air supplement hole 1) is a solid part, and when the solid part contacts the enthalpy increasing hole, the enthalpy increasing hole is closed by the solid part. By such a setting, the area where the enthalpy increasing hole can be opened is expanded, and the enthalpy increasing effect is improved.

[0052] As an optional embodiment, the injection port 11 is composed of two intersecting waist-shaped holes, as shown in Figure 1 . The outer circle boundaries of the two waist-shaped holes are respectively the boundary at which the roller 6 starts to open the air supplement hole 1 when it rotates to a certain angle, and the boundary at which the roller 6 closes the air supplement hole 1 when it rotates to a certain angle. And the major radius of the two waist-shaped holes is R 外 , the minor radius is R 内 , the outer radius of the roller is R, and 0.95≤R 外 / R≤1.05 and 1mm≤R 外 -R 内 ≤3mm are satisfied; according to the most ideal design method, R 外 =R, but there is an error in the processing of parts, so 0.95≤R 外 / R≤1.05 is satisfied. R 外 -R 内 In many cases, its value should be as small as possible, but when R 外 -R 内 <1mm, a milling cutter with a diameter less than 1mm needs to be used for processing, which has low processing efficiency and high cost. When the diameter of the milling cutter is ≥3mm, the processing efficiency of the part is no longer obviously improved, and it is unnecessary to continue to sacrifice energy efficiency to facilitate processing.

[0053] As an optional implementation, the intersection position of the injection port 11 is a fillet transition; and the transition fillet of the outer arc of the two waist-shaped holes satisfies r≥1mm, at this time k≤1, the milling cutter diameter D is greater than or equal to 2mm, and the processing beat is further improved.

[0054] As an optional implementation, the line connecting the center of the cylinder 3 and the intersection point of the center lines of the two waist-shaped holes is taken as a division line, and the special-shaped hole is divided into two parts, and the area S1 near the suction part is greater than the area S2 near the exhaust part. By such an arrangement, the opening of the air supplement hole 1 can be more timely, and the area where backflow may exist is less, thereby improving the air supplement and enthalpy increase effect and improving the compressor efficiency. As shown in Figure 15 .

[0055] As an optional implementation, the injection port 11 of the air supplement and enthalpy increase structure is a waist-shaped hole. The large radius of the waist-shaped hole is R 外 , the small radius is R 内 , the outer radius of the roller is R, and 0.95≤R 外 / R≤1.05 and 1mm≤R 外 -R 内 ≤3mm are satisfied; the outer circular boundaries of the two waist-shaped holes are respectively the boundaries at which the roller starts to open the air supplement hole when the roller turns to a certain angle. In fact, when the air supplement hole is large enough, the S2 area is reduced to zero, which simplifies the air supplement hole structure and is beneficial to the processing and inspection of the air supplement hole.

[0056] On the other hand, the application provides an enthalpy-increasing or liquid-injection compressor adopting the air supplement and enthalpy increase structure. As shown in Figure 16 , the compressor includes a cylinder end cover, a cylinder 3, a roller 6, a crankshaft, an air supplement channel 5, and an air supplement and enthalpy increase structure. The air supplement hole 1 is arranged on the cylinder end cover (lower flange 2, upper flange, or partition plate), and air is supplemented into the cylinder 3 through the air supplement hole 1. The injection port 11 of the air supplement hole 1 is a non-circular structure. The circular structure has the highest processing efficiency and the lowest cost, but for the enthalpy-increasing compressor, the circular enthalpy-increasing hole area that can be opened is too small, resulting in poor enthalpy-increasing effect. By adopting the non-circular special-shaped port, the enthalpy-increasing area can be maximized in a limited area to improve the enthalpy-increasing effect, and the injection port 11 is composed of smooth curves, or the injection port 11 is formed by the intersection of a plurality of curves, and the inner intersection angle of any two intersecting curves is greater than 180°. By such an arrangement, numerical milling processing can be realized, the production efficiency is high, the batch production requirement is met, and the processing cost is reduced.

[0057] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A gas replenishing and enthalpy increasing structure, characterized in that: The air supply hole comprises an injection port located on the inner cavity end surface of the cylinder, one side of the injection port is connected to the compression chamber of the compressor, and the other side of the injection port is connected to the air supply channel. The injection port is a special-shaped port and is composed of a smooth curve. The injection port is composed of two intersecting waist-shaped holes, and the intersection of the two waist-shaped holes is a rounded transition; The maximum radius of the two waist-shaped holes is R 外 , the small radius is R 内 , the outer radius of the roller is R, which satisfies 0.95≤Router / R≤1.05, and 1mm≤Router-Rinner≤3mm; The intersection of the center lines of the two waist-shaped holes and the line connecting the center of the cylinder are used as the dividing line to divide the special-shaped port into two parts, wherein the area S1 of one part close to the cylinder intake part is greater than the area S2 of the other part close to the cylinder exhaust part.

2. The air-supplementing and enthalpy-increasing structure according to claim 1, characterized in that: The curvature of any point on the curve is K, and K≤2.

3. The air-supplementing and enthalpy-increasing structure according to claim 2, characterized in that: The curvature K is ≤ 1.

33.

4. A compressor, characterized in that: It comprises a cylinder end cover, a cylinder, a roller, a crankshaft, an air supply channel and the air supply and enthalpy increase structure according to any one of claims 1 to 3, and the air supply hole is opened on the cylinder end cover.

5. The compressor according to claim 4, characterized in that The cylinder end cover is the lower flange, upper flange or partition of the compressor.

6. The compressor according to claim 4, characterized in that All or part of the injection port is located within the rotation coverage area of ​​the inner circle of the roller.

7. The compressor according to claim 4, characterized in that There is an invalid area of ​​the injection port; the center distance between the center of the roller and the center of the cylinder end cover is e, then the circle with the center of the cylinder end cover as the center and (Re) as the radius is the calibration circle; the overlapping area of ​​the injection port and the calibration circle is the invalid area of ​​the injection port.

8. The compressor according to claim 7, characterized in that The end portion of the crankshaft close to the eccentric portion radially extends to the outer contour line of the crankshaft, filling the high-pressure area of ​​the inner hole of the roller into a solid body.

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