Piston compressor and mobile refrigerator that includes this

Abstract

This utility model relates to a piston compressor comprising a crankcase, at least two exhaust silencers, a valve plate assembly, a cylinder head, a connecting pipe, and an exhaust pipe. The cylinder head includes a cylinder head high-pressure chamber, the crankcase includes a crankcase exhaust passage, and the crankcase exhaust passage is connected to the cylinder head high-pressure chamber by a one-way exhaust port in the valve plate assembly. The crankcase and the valve plate assembly each include at least two exhaust ports, each connected to the at least two exhaust silencers, and the cylinder head high-pressure chamber is connected to the at least two exhaust silencers via the corresponding exhaust ports in the crankcase and the valve plate assembly.The connecting pipe joins the at least two exhaust silencers, and the exhaust pipe is connected to one of the at least two exhaust silencers, thereby forming at least two gas discharge paths. Furthermore, the present utility model also relates to a mobile refrigerator that includes the piston compressor.

Description

A piston compressor and a mobile refrigerator including the same Technical Field

[0001] The utility model relates to a piston compressor, more particularly to a piston compressor with low exhaust pressure pulsation. In addition, the utility model also relates to a mobile refrigerator comprising the piston compressor. Background Art

[0002] For piston compressors, the vibration and noise generated during operation have long been a problem that the industry has been working to address, especially in environments with strict noise requirements. However, due to the impact of high-pressure gas during the exhaust process, piston compressors inevitably generate quite severe vibration and loud noise.

[0003] Relatively large piston compressors typically use a large exhaust muffler to buffer exhaust pressure pulsations and reduce refrigeration system noise. However, small / micro piston compressors, such as those used in mobile refrigerators (such as car refrigerators), still generate significant exhaust pressure pulsations during operation due to their size limiting the volume of the exhaust muffler and the fact that the gas remains in one path during exhaust. This can cause the entire refrigeration system (refrigerator, air conditioner, etc.) to generate significant noise.

[0004] Some researchers have addressed this issue by using specialized materials in compressors to fully utilize the compressor's internal space and increase the volume of the exhaust muffler. However, compressor exhaust mufflers place high demands on materials, requiring them to be resistant to high temperatures, high pressures, and oils, making them difficult to obtain. Other researchers are attempting to address this issue by using engineering plastics to create irregular shapes in the exhaust muffler, thereby fully utilizing the compressor's internal space and increasing its volume. However, this approach places high demands on engineering plastics and presents challenges in its fabrication process.

[0005] Utility Model Content

[0006] The present invention aims to at least partially address the aforementioned technical problems in the related art. Thus, the present invention provides a small / micro piston compressor, such as a piston compressor suitable for use in a mobile refrigerator (e.g., a car refrigerator), which effectively offsets or reduces exhaust pressure pulsation and the resulting refrigeration system noise.

[0007] To this end, the present invention proposes a piston compressor comprising a crankcase, at least two exhaust mufflers, a valve plate assembly, a cylinder head, a connecting pipe, and an exhaust pipe. The cylinder head includes a high-pressure chamber, the crankcase includes a crankcase exhaust passage, and the crankcase exhaust passage is connected to the high-pressure chamber of the cylinder head via a one-way exhaust hole in the valve plate assembly. The crankcase and the valve plate assembly each include at least two exhaust holes, respectively assigned to the at least two exhaust mufflers. The high-pressure chamber of the cylinder head is connected to the at least two exhaust mufflers via corresponding exhaust holes in the crankcase and the valve plate assembly. The connecting pipe connects the at least two exhaust mufflers to each other, and the exhaust pipe connects to any one of the at least two exhaust mufflers, thereby forming at least two gas exhaust paths.

[0008] According to the utility model, the gas discharged into the high-pressure chamber of the cylinder head through the crankcase exhaust passage is divided into at least two parts. The gas of the at least two parts forms a canceling effect through the stroke difference between different exhaust paths, thereby reducing the gas pressure pulsation and further reducing the vibration and noise caused by the operation of the piston compressor.

[0009] According to a preferred embodiment of the present invention, the piston compressor has two gas discharge paths for discharging the gas entering the high-pressure chamber of the cylinder head, and the two gas discharge paths are:

[0010] a first gas exhaust path in which gas sequentially passes through a first exhaust hole in the valve plate assembly and a first exhaust hole in the crankcase into a first exhaust muffler and is then exhausted through the exhaust pipe, wherein the exhaust pipe is connected to the first exhaust muffler; and

[0011] A second gas exhaust path, in which the gas sequentially enters the second exhaust muffler through the second exhaust hole in the valve plate assembly and the second exhaust hole in the crankcase, then enters the first exhaust muffler through the connecting pipe, and is then discharged through the exhaust pipe.

[0012] According to another preferred embodiment of the present invention, the piston compressor has two gas discharge paths for discharging the gas entering the high-pressure chamber of the cylinder head, and the two gas discharge paths are:

[0013] a first gas exhaust path in which gas sequentially passes through a first exhaust hole in the valve plate assembly and a first exhaust hole in the crankcase into the first exhaust muffler, then enters the second exhaust muffler via the connecting pipe, and is then exhausted through the exhaust pipe, wherein the exhaust pipe is connected to the second exhaust muffler; and

[0014] A second gas exhaust path, in which the gas sequentially passes through the second exhaust hole in the valve plate assembly and the second exhaust hole in the crankcase into the second exhaust muffler and is then exhausted through the exhaust pipe.

[0015] According to a preferred embodiment of the present invention, the one-way exhaust hole in the valve plate assembly is controlled by a one-way valve.

[0016] According to a preferred embodiment of the present invention, the first exhaust muffler and the second exhaust muffler are integrated with the crankcase and are respectively located on either side of the crankcase exhaust passage. Based on this arrangement, the volume of the piston compressor is further reduced, making it easier to use in a vehicle.

[0017] According to another aspect of the present invention, a mobile refrigerator is provided. The mobile refrigerator includes the piston compressor according to the above aspect. The mobile refrigerator may be, for example, a vehicle-mounted refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] FIG1 shows an exploded view of a piston compressor according to a first embodiment of the present invention, schematically illustrating the flow direction of exhaust gas;

[0020] FIG2 shows a perspective exploded view of a piston compressor according to a first embodiment of the present invention;

[0021] FIG3 shows an exploded view of a piston compressor according to a second embodiment of the present invention, schematically illustrating the flow direction of exhaust gas;

[0022] FIG4 shows a perspective exploded view of a piston compressor according to a second embodiment of the present invention;

[0023] FIG5 shows a schematic cross-sectional view of a crankcase of a piston compressor according to the present invention at an exhaust hole leading to an exhaust muffler. DETAILED DESCRIPTION

[0024] The following describes an embodiment of the present invention in detail. Examples of the embodiment are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be understood as limiting the present invention.

[0025] First, refer to Figures 1 and 2, which show a piston compressor of a first embodiment of the present invention, which includes a crankcase 1, a first exhaust muffler 13, a second exhaust muffler 23, a valve plate assembly 2, a cylinder head 3, a connecting pipe 4 and an exhaust pipe 5, wherein the cylinder head 3 includes a cylinder head high-pressure chamber, the crankcase 1 includes a crankcase exhaust channel, which is connected to the cylinder head high-pressure chamber of the cylinder head 3 through the one-way exhaust hole in the valve plate assembly 2, wherein the connecting pipe 4 connects the first exhaust muffler 13 and the second exhaust muffler 23, and the exhaust pipe 5 is connected to the first exhaust muffler 13. The piston compressor has two gas discharge paths for discharging the gas entering the high-pressure chamber of the cylinder head, wherein in the first gas discharge path, the gas passes through the first exhaust hole 11 in the valve plate assembly 2 and the first exhaust hole 12 in the crankcase 1 in sequence into the first exhaust muffler 13, and is then discharged through the exhaust pipe 5, and in the second gas discharge path, the gas passes through the second exhaust hole 21 in the valve plate assembly 2 and the second exhaust hole 22 in the crankcase 1 in sequence into the second exhaust muffler 23, and then further enters the first exhaust muffler 13 via the connecting pipe 4, and is then discharged through the exhaust pipe 5.

[0026] In this embodiment, the gas discharged into the high-pressure chamber of the cylinder head via the crankcase exhaust passage is divided into two parts: one portion is discharged through a first gas discharge path, and the other portion is discharged through a second gas discharge path. The difference in the travel distances between these two portions of exhaust gas creates a canceling effect, thereby offsetting and reducing gas pressure pulsations, thereby reducing vibration and noise caused by the piston compressor during operation.

[0027] 3 and 4 , which illustrate a piston compressor according to a second embodiment of the present invention, the configuration of the piston compressor is substantially the same as that of the first embodiment, except that the exhaust pipe 5 is connected to the second exhaust muffler 23. In this second embodiment, the two exhaust gases also have a travel difference between the different discharge paths, thereby effectively offsetting and reducing gas pressure pulsations and reducing vibration and noise caused by the operation of the piston compressor.

[0028] Furthermore, Figure 5 shows a schematic cross-sectional view of the crankcase of the piston compressor of the present invention, taken at the exhaust port leading to the exhaust muffler. As can be seen from Figure 5, the mufflers of the piston compressor of the present invention are integrated with the crankcase and located on either side of the crankcase exhaust passage. This arrangement further reduces the size of the piston compressor, making it easier to use in a vehicle.

[0029] It should be understood that the piston compressor with multiple gas discharge paths according to the present invention is very advantageous for refrigeration equipment with limited size and space, because the piston compressor according to the present invention will not be affected by the increase in size and space caused by the need to use a larger exhaust silencer.

[0030] According to another aspect of the present invention, a mobile refrigerator, such as a vehicle refrigerator, includes a piston compressor according to any of the above embodiments. Due to the above advantages of the piston compressor, the vibration and noise of the vehicle refrigerator including the piston compressor during operation are significantly reduced.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation structure and operation. Therefore, they cannot be understood as limitations on the present invention.

[0032] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Thus, the definition of "first", "second", and "third" features may explicitly or implicitly include one or more of these features.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A piston compressor comprising a crankcase (1), at least two exhaust mufflers (13, 23), a valve plate assembly (2), a cylinder head (3), a connecting pipe (4) and an exhaust pipe (5), wherein: The cylinder head includes a cylinder head high-pressure chamber, the crankcase includes a crankcase exhaust passage, and the crankcase exhaust passage is connected to the cylinder head high-pressure chamber of the cylinder head through a one-way exhaust hole in the valve plate assembly. The invention is characterized in that the crankcase (1) and the valve plate assembly (2) each include at least two exhaust holes respectively assigned to the at least two exhaust mufflers (13, 23); the cylinder head high-pressure chamber of the cylinder head is connected to the at least two exhaust mufflers (13, 23) through the corresponding exhaust holes in the crankcase (1) and the valve plate assembly (2); the connecting pipe (4) connects the at least two exhaust mufflers (13, 23) to each other, and the exhaust pipe (5) is connected to any one of the at least two exhaust mufflers (13, 23), thereby forming at least two gas exhaust paths.

2. The piston compressor according to claim 1, characterized in that The piston compressor has two gas discharge paths for discharging the gas entering the high-pressure chamber of the cylinder head. The two gas discharge paths are: a first gas exhaust path, in which gas sequentially passes through a first exhaust hole (11) in the valve plate assembly (2) and a first exhaust hole (12) in the crankcase (1) into a first exhaust muffler (13), and then is exhausted through the exhaust pipe (5), wherein the exhaust pipe (5) is connected to the first exhaust muffler (13); and A second gas exhaust path, in which the gas sequentially passes through the second exhaust hole (21) in the valve plate assembly (2) and the second exhaust hole (22) in the crankcase (1) into the second exhaust muffler (23), then enters the first exhaust muffler (13) via the connecting pipe (4), and is then discharged through the exhaust pipe (5).

3. The piston compressor according to claim 1, characterized in that The piston compressor has two gas discharge paths for discharging the gas entering the high-pressure chamber of the cylinder head. The two gas discharge paths are: a first gas exhaust path in which the gas sequentially passes through a first exhaust hole (11) in the valve plate assembly (2) and a first exhaust hole (12) in the crankcase (1); Entering the first exhaust muffler (13), then entering the second exhaust muffler (23) via the connecting pipe (4), and then being discharged through the exhaust pipe (5), wherein the exhaust pipe (5) is connected to the second exhaust muffler (23); and A second gas exhaust path, in which the gas sequentially passes through the second exhaust hole (21) in the valve plate assembly (2) and the second exhaust hole (22) in the crankcase (1) into the second exhaust muffler (23), and then is discharged through the exhaust pipe (5).

4. The piston compressor according to claim 1, characterized in that The one-way exhaust hole in the valve plate assembly is controlled by a one-way valve.

5. The piston compressor according to claim 2 or 3, characterized in that The first muffler (13) and the second muffler (23) are integrated with the crankcase (1) and are respectively located on both sides of the crankcase exhaust passage.

6. A mobile refrigerator, characterized in that: The mobile refrigerator comprises a piston compressor according to any one of the preceding claims.

7. The mobile refrigerator according to claim 6, characterized in that: This mobile refrigerator is a car-mounted refrigerator.

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