Compressor shell and two-stage enthalpy-increasing compressor

Abstract

The invention relates to a compressor shell and a two-stage enthalpy-increasing compressor. The two-stage enthalpy-increasing compressor comprises a compressor body and a compressor shell, the compressor body comprises a motor part and a pump body part, and the pump body part comprises a first-stage air cylinder and a second-stage air cylinder; the compressor shell comprises a main cavity and a mixing cavity isolated from the main cavity. The mixing cavity is arranged outside the bottom end of the main cavity; the main cavity is provided with a compressor body; the mixing cavity is communicated with the first-stage air cylinder and the second-stage air cylinder through air channels. According to the invention, the mixing cavity for air supply and enthalpy increase is isolated from the compressor body, so that the mixing cavity can be simply and conveniently adjusted into a better cavity size, the exhaust temperature is better reduced through air supply and enthalpy increase, the axial height of the compressor body does not need to be changed, the stress and friction area is not increased, and the service life of the compressor is prolonged. And finally, the performance of the compressor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly relates to a compressor housing and a two-stage enhanced enthalpy compressor. Background Art

[0002] In a two-stage compressor, the gas compressed by the first-stage cylinder enters the mixing cavity through the exhaust hole, mixes with the injected gas, and the mixed gas is sucked by the second-stage cylinder, compressed and then discharged. Theoretically, the larger the mixing cavity is, the better. The larger the mixing cavity is, the more enhanced enthalpy gas can be injected, and the higher the heating capacity of the compressor is. If the mixing cavity is too small, it will affect the injection of the injected gas, increase the injection resistance of the injected gas, and at the same time limit the injection amount of the enhanced enthalpy gas, reducing the total heating capacity of the compressor. Currently, when designing the mixing cavity, it is mainly considered to directly set the mixing cavity in the compressor body without isolating it from the pump body part. In this case, the mixing cavity cannot be freely set, which limits the size of the mixing cavity. Moreover, when increasing the size of the mixing cavity, only the middle partition or the lower cylinder head can be directly increased, thereby increasing the axial force and friction area of the compressor, and ultimately reducing the performance of the compressor. Therefore, it is necessary to design a two-stage enhanced enthalpy compressor that has no impact on the compressor body and can flexibly and freely set the size of the mixing cavity.

[0003] It should be noted that the information disclosed in the background art part of this invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a compressor housing and a two-stage enhanced enthalpy compressor, which adopt the method of isolating the mixing cavity from the compressor body, so that the size of the mixing cavity can be flexibly set according to requirements, and the impact on the compressor body can be reduced.

[0005] To achieve the above purpose, according to one aspect of the present invention, a compressor housing for a two-stage enhanced enthalpy compressor is provided, which includes a main cavity and a mixing cavity isolated from the main cavity; the mixing cavity is arranged outside the bottom end of the main cavity; the main cavity is used to arrange the compressor body of the two-stage enhanced enthalpy compressor; the mixing cavity is used to be in gas communication with the first-stage cylinder and the second-stage cylinder of the compressor body.

[0006] In some embodiments, the outer diameter of the mixing cavity is greater than or equal to the outer diameter of the main cavity, and / or, the volume of the mixing cavity is 2 to 10 times the volume of the compression cavity of the first-stage cylinder.

[0007] In some embodiments, the main cavity is formed by enclosing an upper shell cover, a cylinder body, and a lower shell cover; the upper shell cover covers the top end of the cylinder body; the lower shell cover covers the bottom end of the cylinder body; the mixing cavity is defined by an additional housing; the additional housing is welded and fixed to the lower shell cover.

[0008] In some embodiments, the welding surfaces of the lower shell cover and the additional housing are both flat surfaces.

[0009] In some embodiments, the main cavity is formed by enclosing a cylinder body, an upper shell cover, and a partition member; the mixing cavity is formed by enclosing a lower shell cover and the partition member; the upper shell cover covers the top end of the cylinder body; the lower shell cover covers the bottom end of the cylinder body; the partition member is disposed at the bottom end of the cylinder body and inside the lower shell cover; the side surface of the partition member is welded and fixed to the inner side surface of the lower shell cover.

[0010] In some embodiments, the partition member is a flat plate structure, and / or the partition member is disposed at the position of the original oil sump.

[0011] Further, according to another aspect of the present invention, there is also provided a two-stage enthalpy-increasing compressor, which includes a compressor body and the compressor housing according to any one of the above; the compressor body is disposed in the main cavity;

[0012] The compressor body includes a motor part and a pump body part; the pump body part includes a first-stage cylinder and a second-stage cylinder, and both the first-stage cylinder and the second-stage cylinder are in gas circuit communication with the mixing cavity.

[0013] In some embodiments, the two-stage enthalpy-increasing compressor further includes a cooling device, which is disposed outside the compressor housing and is used for cooling the mixing cavity.

[0014] In some embodiments, the first-stage cylinder is a lower cylinder away from the motor part, the second-stage cylinder is an upper cylinder close to the motor part, and the lower cylinder is provided with a lower cylinder head;

[0015] Wherein, a lower muffler is provided on the lower cylinder head, and the lower cylinder and the mixing cavity are in gas circuit communication through the lower cylinder head and the lower muffler, or the lower cylinder and the mixing cavity are in gas circuit communication through an external pipeline, the external pipeline is disposed outside the compressor housing, and an oil-gas separator is provided on the external pipeline.

[0016] In some embodiments, the first-stage cylinder is a lower cylinder away from the motor part, and the second-stage cylinder is an upper cylinder close to the motor part;

[0017] Wherein, the mixing cavity and the upper cylinder are in gas path communication through an internal pipeline or an external pipeline. The internal pipeline is arranged inside the main cavity, and the external pipeline is arranged outside the main cavity.

[0018] In summary, the compressor housing and the two-stage enthalpy-increasing compressor provided by the present invention at least have the following

[0019] Beneficial effects:

[0020] By separately and independently arranging the mixing cavity for supplementing gas and increasing enthalpy and the main cavity for installing the compressor body, the mixing cavity is isolated from the compressor body and does not interfere with each other. Furthermore, the size of the mixing cavity can be adjusted to an optimal cavity size relatively simply and conveniently. By increasing the mixing cavity, the air flow pulsation in the mixing cavity caused by the first-stage exhaust and the injection gas is reduced, the injection resistance and the suction resistance of the second-stage cylinder are reduced, thereby improving the total heating capacity and performance of the compressor. And when the mixing cavity is enlarged in the present invention, the axial height of the compressor body does not need to be increased, thus the axial force and the friction area are not increased, and the performance of the compressor is further improved. Also, because the mixing cavity is independent outside the pump body part and the oil sump, the temperature of the mixing cavity can be lower than when it was originally arranged in the pump body part, which can better reduce the superheat degree of the suction of the second-stage cylinder and improve the energy efficiency and reliability of the compressor. Description of the Drawings

[0021] Those of ordinary skill in the art will understand that the provided drawings are used to better understand the present invention and do not constitute any limitation to the scope of the present invention. Among them:

[0022] Figure 1 is a schematic structural diagram of a two-stage enthalpy-increasing compressor provided in Embodiment 1 of the present invention;

[0023] Figure 2 is a schematic structural diagram of a two-stage enthalpy-increasing compressor provided in Embodiment 2 of the present invention.

[0024] In the drawings:

[0025] 100 - Compressor body; 110 - Pump body part; 111 - First-stage cylinder; 112 - Second-stage cylinder; 113 - Middle partition; 114 - Lower cylinder head; 115 - Upper cylinder head; 116 - Upper muffler; 200 - Compressor housing; 210 - Main cavity; 211 - Cylinder body; 212 - Upper shell cover; 213 - Lower shell cover; 214 - Partition member; 220 - Mixing cavity; 230 - Additional housing; 300 - Exhaust pipe; 400 - Liquid receiver; 500 - Enthalpy-increasing part. Detailed Embodiments

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and are all drawn with non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose provided by the present invention. In order to make the purpose, features, and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Any modification of the structure, change in the proportional relationship, or adjustment of the size, in the case of being the same or similar to the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element. The singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in the sense of including "and / or", the term "several" is generally used in the sense of including "at least one", the term "at least two" is generally used in the sense of including "two or more", in addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0028] In addition, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] The "top" and "bottom" described herein are defined by the positions of various components, elements or actions relative to the pump body during actual use of the compressor. Although the "top" and "bottom" are non-restrictive, the "top" is usually the end of the pump body close to the motor part, and the "bottom" is the end of the pump body away from the motor part. For example, for a vertical compressor, the "bottom" corresponds to the position where an oil pool is provided, and the oil pool is generally used to inject lubricating oil into the compressor. In addition, the term "axial" generally refers to the direction along the central axis of the compressor, and the "circumferential" refers to the direction around the central axis of the compressor.

[0030] The core idea of the present invention is to provide a compressor housing and a two-stage reheat-increasing compressor, which aims to isolate the mixing chamber from the compressor body so that the size of the mixing chamber is not restricted while not affecting the performance of the compressor. The mixing chamber can be conveniently designed to have a better cavity size, thereby improving the total heating capacity and performance of the compressor.

[0031] The two-stage enthalpy-increasing compressor of the present invention can be installed horizontally or vertically, without limitation. The two-stage enthalpy-increasing compressor of the present invention is a rolling rotor compressor. By setting a two-stage cylinder, the compressor of the present invention can adapt to more working conditions. At the same time, the exhaust temperature is reduced by increasing the enthalpy of the air once, thereby improving the performance of the compressor.

[0032] The following description is given in conjunction with the accompanying drawings.

[0033] <Example 1>

[0034] Please refer to Figure 1, in the first embodiment of the present application, a two-stage enthalpy-increasing compressor is provided, including a compressor body 100 and a compressor housing 200. The compressor housing 200 includes a main cavity 210 and a mixing cavity 220 isolated from the main cavity 210. It should be understood that the mixing cavity 220 and the main cavity 210 are arranged along the axial direction of the compressor (arranged from bottom to top in the figure). Here, "isolation" means that physically, the mixing cavity 220 is independently arranged outside the main cavity 210 without interference. The main purpose of isolation is to prevent the mixing cavity 220 from being restricted by the compressor body 100 and unable to freely adjust its size, and also to avoid affecting the performance of the compressor.

[0035] Specifically, the compressor body 100 is arranged in the main cavity 210. The compressor body 100 includes a motor part (not shown) and a pump body part 110. Since the mixing cavity 220 is arranged outside the main cavity 210, it is not arranged together with the pump body part 110. Although the motor part is not shown in the figure, those skilled in the art should be able to understand the structure and installation method of the motor part, which will not be elaborated here. The main function of the motor part is to drive the pump body part 110 to compress gas.

[0036] The pump body part 110 includes a first-stage cylinder 111, a middle partition 113, and a second-stage cylinder 112 arranged in sequence along the axial direction of the compressor. The middle partition 113 is arranged between the first-stage cylinder 111 and the second-stage cylinder 112. In addition, the mixing cavity 220 is respectively in gas communication with the first-stage cylinder 111 and the second-stage cylinder 112 (refer to the gas paths marked by the arrows). The gas communication method can be adjusted adaptively according to actual needs. During actual use, the gas compressed by the first-stage cylinder 111 enters the mixing cavity 220 through the corresponding gas path (such as the arrow indicates), mixes with the injected gas, and the mixed gas is then sucked by the second-stage cylinder 112 through the corresponding gas path, compressed, and discharged from the compressor.

[0037] The mixing cavity 220 should be arranged close to the first-stage cylinder 111. In this way, in the present invention, the mixing cavity 220 is arranged outside the bottom end of the main cavity 210, so that the gas path is shorter and the exhaust resistance is small.

[0038] It can be seen that for the two-stage enthalpy-increasing compressor of the present invention, by isolating the mixing cavity 220 from the compressor body 100, it is beneficial to adjust the mixing cavity 220 to an optimal cavity size. By enlarging the mixing cavity 220, the air flow pulsation in the mixing cavity caused by the first-stage exhaust and injection gas is reduced, the injection resistance and the suction resistance of the second-stage cylinder are decreased, thereby better improving the total heating capacity and performance of the compressor. At the same time, when the present invention enlarges the mixing cavity 220, there is no need to increase the height of the middle partition plate 113 or the lower cylinder head 114, thus not increasing the shaft force and the friction area, and finally not reducing the performance of the compressor. In particular, the mixing cavity 220 is independent outside the pump body part 110 and the oil sump, so that the temperature of the mixing cavity 220 can be lower than the original temperature when it is arranged in the pump body part 110, which is beneficial to better reducing the superheat degree of the suction of the second-stage cylinder 112 and improving the energy efficiency and reliability of the compressor.

[0039] Furthermore, as can be understood by those skilled in the art, the two-stage enthalpy-increasing compressor of the present invention further includes an exhaust pipe 300, a liquid receiver 400 and an enthalpy-increasing part 500. The liquid receiver 400 and the enthalpy-increasing part 500 are both fixed on the outer side of the compressor housing 200. The exhaust pipe 300 is fixed on the compressor housing 200. The high-pressure gas compressed by the second-stage cylinder 112 is finally discharged from the compressor through the exhaust pipe 300. Usually, the second-stage cylinder 112 is arranged according to the position of the exhaust pipe 300, and the second-stage cylinder 112 is arranged closer to the exhaust pipe 300 than the first-stage cylinder 111. Optionally, the exhaust pipe 300 is arranged at the top end of the compressor housing 200. Therefore, the upper cylinder is more suitable as the second-stage cylinder 112. It should be understood that the upper cylinder described herein is close to the motor part, and the lower cylinder is far from the motor part.

[0040] The first-stage cylinder 111 is communicated with the liquid receiver 400, and the liquid receiver 400 provides the gas for compression for the first-stage cylinder 111. Optionally, in some embodiments, an air inlet (not marked) is provided on the first-stage cylinder 111, and the air inlet is communicated with the liquid receiver 400.

[0041] The mixing cavity 220 is in communication with the enthalpy-increasing part 500. The number of the enthalpy-increasing parts 500 can be one or more. Optionally, in some embodiments, a gas-inlet for enthalpy-increasing is provided on the mixing cavity 220 and is in communication with the enthalpy-increasing part 500 (not shown). The enthalpy-increasing part 500 injects gas into the mixing cavity 220 through the gas-inlet for enthalpy-increasing to achieve the effect of gas-inlet for enthalpy-increasing. Optionally, in some embodiments, an air inlet and an air outlet are further provided on the mixing cavity 220. The gas compressed by the first-stage cylinder 111 is discharged into the mixing cavity 220 through the corresponding gas path from the inside or outside of the main cavity 210 via the air inlet described herein. After being mixed with the injected enthalpy-increasing gas, the mixed gas enters the corresponding gas path through the air outlet described herein and is finally discharged into the second-stage cylinder 112 from the inside or outside of the main cavity 210. The enthalpy-increasing part 500 can be in communication with the mixing cavity 220 through an enthalpy-increasing pipeline. By penetrating the enthalpy-increasing pipeline from the outside of the compressor housing 2 into the mixing cavity 220, the compressor is supplemented with gas for enthalpy-increasing.

[0042] The outer diameter of the mixing cavity 220 can be greater than, less than or equal to the outer diameter of the main cavity 210. Preferably, the outer diameter of the mixing cavity 220 is greater than or equal to the outer diameter of the main cavity 210. The outer diameter of the mixing cavity 220 should not exceed the maximum outer diameter specified by the pressure vessel design standard.

[0043] The volume of the mixing cavity 220 is preferably as large as possible. The larger the mixing cavity 220 is, the more enthalpy-increasing gas can be injected, and the higher the heating capacity of the compressor is. Since the mixing cavity 220 is independently provided outside the main cavity 210, its size can be flexibly adjusted according to needs, so that the volume of the mixing cavity 220 is in an optimal state. Preferably, the volume of the mixing cavity 220 is 2 to 10 times the volume of the compression cavity of the first-stage cylinder 111, so that the mixing cavity 220 has a relatively large cavity size, which can more effectively reduce the air flow pulsation in the mixing cavity 220 caused by the first-stage exhaust and the injected gas, and at the same time reduce the injection resistance and the suction resistance of the second-stage cylinder 112.

[0044] There is no special requirement for the shape of the mixing cavity 220. In addition to the shape shown in the figure, those skilled in the art should understand that the mixing cavity 220 can also adopt any other shape. Optionally, the mixing cavity 220 is in a cylindrical shape, which is basically the same as the shape of the main cavity 210. Of course, it is not limited thereto in practice. Further, from the perspective of simple structure design and convenient processing, the mixing cavity 220 preferably selects a shape that is easy to process and install.

[0045] Optionally, the bottom of the mixing cavity 220 is set as a plane, which is beneficial to fixing the compressor through the plane. However, in other embodiments, the bottom of the mixing cavity 220 can be set as an arc surface, a curved surface or any other shape.

[0046] It should be noted that there are many ways to independently set up the mixing cavity 220 outside the main cavity 210, and at least one can be selected for implementation. The following is a demonstration.

[0047] Figure 1 In the described non-limiting embodiment, the main cavity 210 is formed by enclosing a cylinder body 211, an upper shell cover 212, and a lower shell cover 213; the upper shell cover 212 is directly covered on the top end of the cylinder body 211; the lower shell cover 213 is directly covered on the bottom end of the cylinder body 211; at this time, another additional shell 230 is prepared, and the mixing cavity 220 is directly defined by the additional shell 220. Furthermore, during installation, only the additional shell 230 needs to be welded and fixed on the lower shell cover 213. This structure is simple, convenient for processing and manufacturing, and also convenient for installation and fixation. Moreover, this structure can directly weld the additional shell 230 at the bottom end of the original compressor shell without modifying the original compressor shell, and an independent mixing cavity 220 can be obtained, so it is simpler and more convenient. In addition, the welding process is simple, easy to realize mechanization and automation, and can also form a larger contact area on the joint surface, so it has better firmness and seismic resistance, effectively enhancing the structural strength and stability of the mixing cavity 220. Optionally, the welding surfaces of the additional shell 230 and the lower shell cover 213 are flat surfaces, and the flat surfaces are beneficial to increasing the welding area, achieving a better welding effect and higher welding efficiency. The processing method of the additional shell 230 is not limited, such as die-casting, sheet metal, injection molding, etc.

[0048] Furthermore, for the gas path, the mixing cavity 220 can be gas-path connected to the second-stage cylinder 112 and the first-stage cylinder 111 by means of running pipelines (such as copper pipes) inside or outside the main cavity 210.

[0049] Optionally, in some embodiments, a lower cylinder head 114 is provided at the end of the first-stage cylinder 111 far from the second-stage cylinder 112, and a lower silencer (not shown) is provided on the lower cylinder head 114. The first-stage cylinder 111 and the mixing cavity 220 are gas-path connected through the lower cylinder head 114 and the lower silencer. That is to say, the gas discharged from the first-stage cylinder 111 enters the mixing cavity 220 through the lower cylinder head 114 and the lower silencer, which is convenient for realizing oil-gas separation and preventing oil from entering the mixing cavity 220.

[0050] Optionally, in some embodiments, the first-stage cylinder 111 and the mixing cavity 220 are gas-path connected through an external pipeline. The external pipeline is arranged outside the main cavity 210, and an oil-gas separator is arranged on the external pipeline. In this way, the gas discharged from the first-stage cylinder 111 is directly discharged outside the main cavity 210 and enters the mixing cavity 220 through the external pipeline.

[0051] Optionally, in some embodiments, an upper cylinder cover 115 is provided at the end of the second cylinder 112 away from the first cylinder 111, and an upper muffler 116 is provided on the upper cylinder cover 115. In this way, the gas compressed by the second cylinder 112 is discharged through the upper cylinder cover 115 and the upper muffler 116.

[0052] Optionally, the mixing chamber 220 and the second-stage cylinder 112 are gas-circuit-connected through an internal pipeline, which is disposed inside the main chamber 210, so that the mixed gas discharged from the mixing chamber 220 is discharged into the second-stage cylinder 112 via the internal pipeline. Alternatively, the mixing chamber 220 and the second-stage cylinder 112 are gas-circuit-connected through an external pipeline, which is disposed outside the main chamber 210, so that the mixing chamber 220 discharges the mixed gas into the second-stage cylinder 112 from the outside of the compressor housing 200 via the external pipeline.

[0053] The two-stage enthalpy-increasing compressor of the present invention may further include a cooling device (not shown), which is arranged on the outside of the compressor housing 200 and is used to cool the mixing chamber 220, thereby better reducing the superheat of the second-stage intake air and improving the energy efficiency and reliability of the compressor.

[0054] In various embodiments disclosed in the present invention, the above-mentioned cooling device can be any equipment with a cooling function, such as a cooling pipe, a cooling material, a temperature control pool, etc.

[0055] In some exemplary embodiments, the cooling device uses a cooling pipe, which can be directly coated on the outside of the mixing cavity 220. A cooling medium is introduced into the cooling pipe, and the mixing cavity 220 is subjected to convective heat exchange by the cooling medium to achieve a cooling effect. Preferably, the low-temperature flow path on the evaporation side of the compressor system is introduced into the cooling pipe, so that the mixing cavity 220 is directly cooled by the refrigerant of the compressor, which is simpler and more convenient.

[0056] In some exemplary embodiments, the cooling device uses a cooling material, and the cooling material directly covers the outside of the mixing cavity 220. The cooling material can be any one or more materials that are not easily heated and are familiar to those skilled in the art.

[0057] In other exemplary embodiments, the cooling device adopts a temperature control pool, and the mixing cavity 220 is at least partially immersed in the temperature control pool. The temperature control pool contains a cooling medium, and the purpose of cooling the mixing cavity 220 is achieved by controlling the temperature of the cooling medium.

[0058] It should be noted that the above cooling measures are only for illustration and do not constitute an improper limitation to the present invention.

[0059] <Example 2>

[0060] Figure 2 The structural schematic diagram of the two-stage enthalpy-increasing compressor provided in the second embodiment is shown. The structure of the two-stage enthalpy-increasing compressor provided in the second embodiment is basically the same as that of the two-stage enthalpy-increasing compressor provided in the first embodiment. For the same parts, no further description will be given. The following mainly focuses on the differences for explanation.

[0061] The difference between this embodiment and the first embodiment lies in the setting method of the mixing cavity 220. Specifically, an independent mixing cavity 220 is formed by dividing through a partition member 214.

[0062] Please refer to Figure 2 , in the second embodiment of the present application, the main cavity 210 is formed by enclosing a cylinder body 211, an upper shell cover 212 and a partition member 214; the mixing cavity 220 is formed by enclosing a lower shell cover 213 and a partition member 214; the upper shell cover 212 is directly covered on the top end of the cylinder body 211; the lower shell cover 213 is directly covered on the bottom end of the cylinder body 211; the partition member 214 is arranged at the bottom end of the cylinder body 211 and is located inside the lower shell cover 213; the side surface of the partition member 214 is fixedly welded to the inner side surface of the lower shell cover 213. Thus, the inner cavity defined by the original compressor housing can be divided by the partition member 214 to form the main cavity 210 and the mixing cavity 220. In specific implementation, this method requires increasing the axial height of the original lower shell cover to facilitate the formation of the mixing cavity 220 between the lower shell cover 213 and the partition member 214.

[0063] The partition member 214 can be of any shape and size with a partition function. The diameter of the partition member 214 matches the inner diameter of the lower shell cover 213 to make the two fit tightly. The partition member 214 is preferably a flat plate structure, which is convenient for processing and manufacturing and has a low cost.

[0064] The partition member 214 can be arranged at the original oil sump position or deviate from the original oil sump position. More preferably, the partition member 214 is arranged at the original oil sump position, which is convenient for not changing the structure of the original compressor body 100 and not affecting the performance of the compressor.

[0065] It should be recognized that in the second embodiment of the present application, even if the axial height of the lower shell cover 213 is increased, it will not affect the height of the pump body part 110, so the overall performance of the compressor is not affected either.

[0066] In summary, by isolating the mixing cavity 220 from the main cavity 210, the mixing cavity 220 is separated from the compressor body 100 without interference. In this way, it is relatively simple and convenient to adjust the mixing cavity 220 to an optimal cavity size, thereby improving the overall heating capacity and performance of the compressor. Moreover, when the mixing cavity 220 is enlarged, the pump body part 110 of the present invention can be like a non-increased enthalpy compressor, and compared with a common two-stage increased enthalpy compressor, the friction area and the shaft force are further reduced. In addition, the mixing cavity 220 is independent outside the pump body part 110 and the oil sump, so the temperature can be reduced, and further, the superheat degree of the second-stage suction can be effectively reduced, improving the energy efficiency and reliability of the compressor.

[0067] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention according to the above disclosure are within the protection scope of the technical solution of the present invention.

Claims

1. A compressor housing for a two-stage enthalpy-increasing compressor, characterized in that, It includes a main cavity and a mixing cavity isolated from the main cavity; the mixing cavity is arranged outside the bottom end of the main cavity; the main cavity is used to arrange the compressor body of the two-stage enthalpy-increasing compressor; the mixing cavity is used to be in gas circuit communication with the first-stage cylinder and the second-stage cylinder of the compressor body.

2. The compressor housing according to claim 1, characterized in that, The outer diameter of the mixing cavity is greater than or equal to the outer diameter of the main cavity, and / or, the volume of the mixing cavity is 2 to 10 times the compression cavity volume of the first-stage cylinder.

3. The compressor housing according to claim 1, wherein The main cavity is formed by enclosing an upper shell cover, a cylinder body and a lower shell cover; the upper shell cover covers the top end of the cylinder body; the lower shell cover covers the bottom end of the cylinder body; the mixing cavity is defined and formed by an additional shell; the additional shell is welded and fixed on the lower shell cover.

4. The compressor housing according to claim 3, characterized in that, The welding surfaces of the lower shell cover and the additional shell are both flat surfaces.

5. The compressor housing according to claim 1, characterized in that, The main cavity is formed by enclosing a cylinder body, an upper shell cover and a partition; the mixing cavity is formed by enclosing a lower shell cover and the partition; the upper shell cover covers the top end of the cylinder body; the lower shell cover covers the bottom end of the cylinder body; the partition is arranged at the bottom end of the cylinder body and is located inside the lower shell cover; the side surface of the partition is welded and fixed to the inner side surface of the lower shell cover.

6. The compressor housing according to claim 5, characterized in that, The partition is of a flat plate structure, and / or, the partition is arranged at the position of the original oil sump.

7. A two-stage enthalpy-increasing compressor, characterized in that, It includes a compressor body and a compressor housing as described in any one of claims 1-6; the compressor body is arranged in the main cavity; The compressor body includes a motor part and a pump body part; the pump body part includes a first-stage cylinder and a second-stage cylinder, and both the first-stage cylinder and the second-stage cylinder are in gas circuit communication with the mixing cavity.

8. The two-stage enthalpy-increasing compressor according to claim 7, wherein, It further includes a cooling device, and the cooling device is arranged outside the compressor housing and is used to cool the mixing cavity.

9. The two-stage enthalpy-increasing compressor according to claim 7, wherein, The first-stage cylinder is a lower cylinder far from the motor part, the second-stage cylinder is an upper cylinder close to the motor part, and the lower cylinder is provided with a lower cylinder head; Wherein, a lower muffler is arranged on the lower cylinder head, and the lower cylinder and the mixing cavity are in gas circuit communication through the lower cylinder head and the lower muffler, or, the lower cylinder and the mixing cavity are in gas circuit communication through an external pipeline, the external pipeline is arranged outside the main cavity, and an oil-gas separator is arranged on the external pipeline.

10. The two-stage enthalpy-increasing compressor according to claim 7, characterized in that, The first-stage cylinder is a lower cylinder far from the motor part, and the second-stage cylinder is an upper cylinder close to the motor part; Wherein, the mixing cavity and the upper cylinder are in gas circuit communication through an internal pipeline or an external pipeline, the internal pipeline is arranged inside the main cavity, and the external pipeline is arranged outside the main cavity.

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