Pipeline structure and two-stage compressor

Abstract

The utility model provides a pipeline structure and a two-stage compressor, and the pipeline structure is used for connecting a first-stage volute outlet and a second-stage volute inlet of the two-stage compressor; the pipeline structure comprises an air inlet seat which can be connected to the secondary volute inlet; one end of the middle pipeline is connected with the air inlet seat, and the other end is connected to an outlet of the primary volute; wherein the middle pipeline and the air inlet seat are of an integrated connection structure. The air inlet seat and the middle pipeline are creatively arranged to be of an integrally-connected pipeline structure, the number of parts is reduced, and the structure is simple and easy to maintain; the internal structure of the compressor is simplified, the assembling efficiency of the compressor is improved, and extra assembling errors caused in the assembling process of the air inlet seat and the middle pipeline are avoided; the use of a set of mold is reduced, and the manufacturing cost of the mold is reduced; the processing procedures are reduced, and the processing cost is reduced; and no gap is formed between the air inlet seat and the middle pipeline, so that the energy loss of the air in the transmission process is reduced, and the overall efficiency of the two-stage compressor is improved.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to a piping structure, and also to a two-stage compressor including the above-mentioned piping structure. Background Technology

[0002] In traditional two-stage single-suction centrifugal compressors, the intermediate pipe, as a key component connecting the outlet of the first-stage volute and the inlet of the second-stage volute, primarily functions to ensure efficient and stable transmission of compressed gas between the two stages. The inlet housing, on the other hand, plays a crucial role in guiding the gas precisely from the volute inlet into the impeller inlet. Its design must fully consider fluid dynamics principles to reduce energy loss and improve intake efficiency.

[0003] However, in traditional designs, the intermediate pipe and the intake seat are treated as two separate parts, which not only increases the complexity of the compressor structure and the difficulty of maintenance, and affects assembly efficiency, but may also introduce additional errors during the assembly process. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a pipe structure that solves a series of drawbacks caused by the need for assembly and connection between the intermediate pipe and the air intake seat.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A piping structure for connecting the outlet of the first-stage volute and the inlet of the second-stage volute of a two-stage compressor; the piping structure includes:

[0007] The air intake seat can be connected to the inlet of the secondary volute.

[0008] The intermediate pipe is connected at one end to the air intake seat and at the other end to the outlet of the first-stage volute.

[0009] The intermediate pipe and the air intake seat are integrally connected.

[0010] Optionally, in the above-described piping structure, the air inlet seat includes an air inlet pipe that can enter the secondary volute inlet and extend to be flush with the air inlet of the secondary impeller of the two-stage compressor.

[0011] Optionally, in the above-described pipe structure, the air intake pipe is a constant diameter air intake pipe.

[0012] Optionally, in the above-described pipeline structure, the air inlet seat includes a first connecting flange, which can be connected to the secondary volute inlet.

[0013] Optionally, in the above-described pipeline structure, the first connecting flange has a plurality of first mounting holes along its circumference to connect the first connecting flange to the secondary volute inlet using first fasteners.

[0014] Optionally, in the above-described pipe structure, a second connecting flange is provided at the end of the intermediate pipe away from the air inlet seat, and the second connecting flange can be connected to the outlet of the first-stage volute.

[0015] Optionally, in the above-described pipeline structure, the second connecting flange has a plurality of second mounting holes along its circumference to connect the second connecting flange to the outlet of the first-stage volute using second fasteners.

[0016] Optionally, in the above-described pipeline structure, the intermediate pipeline is provided with an economizer connection port.

[0017] Optionally, in the above-described pipe structure, the intermediate pipe and the air inlet seat are integrally cast and connected.

[0018] A two-stage compressor includes the piping structure described above.

[0019] In the pipeline structure and two-stage compressor of this application, the inlet seat and the intermediate pipeline are set as an integrally connected pipeline structure, which brings the following advantages: (1) The inlet seat and the intermediate pipeline are combined into one, reducing the number of parts and making the structure simple and easy to maintain; (2) The internal structure of the compressor is simplified, which not only improves the assembly efficiency of the compressor, but also avoids the introduction of additional assembly errors during the assembly process of the inlet seat and the intermediate pipeline; (3) The inlet seat and the intermediate pipeline with the integral connection structure only use one set of molds, reducing the use of one set of molds and reducing the mold manufacturing cost; (4) The inlet seat and the intermediate pipeline do not need to be produced as blanks separately, and the blanks are reduced from two to one, reducing the blank production time, improving the blank production efficiency, and reducing the blank production cost; (5) The inlet seat and the intermediate pipeline are integrally processed, reducing the processing steps, improving the processing efficiency, and reducing the processing cost; (6) There is no gap between the inlet seat and the intermediate pipeline, which reduces the energy loss of gas during the transmission process and improves the overall efficiency of the two-stage compressor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a front view of the pipe structure according to an embodiment of this application;

[0022] Figure 2 This is a side view of the pipe structure according to an embodiment of this application;

[0023] Figure 3 This is a top view of the pipe structure according to an embodiment of this application;

[0024] Figure 4 This is a perspective view of a two-stage compressor according to an embodiment of this application;

[0025] Figure 5 This is a cross-sectional view of a two-stage compressor according to an embodiment of this application;

[0026] Figure 6 This is an exploded view of a two-stage compressor according to an embodiment of this application;

[0027] Figure 7 This is an exploded view of the two-stage compressor according to an embodiment of this application from another angle.

[0028] superior Figure 1-7 middle:

[0029] 1. Inlet housing; 2. Intermediate pipe; 3. First fastener; 4. Second fastener; 5. First-stage volute outlet; 6. Second-stage volute inlet; 7. First-stage impeller; 8. Second-stage impeller; 9. First-stage volute; 10. Second-stage volute;

[0030] 11. Intake pipe; 12. First connecting flange;

[0031] 21. Second connecting flange; 22. Economizer connection port;

[0032] 121. First mounting hole;

[0033] 211. Second mounting hole. Detailed Implementation

[0034] This application provides a pipeline structure and a two-stage compressor.

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] like Figures 1-7As shown, this application embodiment provides a pipeline structure for connecting the first-stage volute outlet 5 and the second-stage volute inlet 6 of a two-stage compressor, so as to transport the gas compressed by the first-stage volute 9 to the second-stage volute 10 for secondary compression. Optionally, the two-stage compressor is a two-stage single-suction centrifugal compressor. The pipeline structure includes an inlet seat 1 and an intermediate pipe 2, which are integrally connected. One end of the intermediate pipe 2 is integrally connected to the inlet seat 1, and the other end can be connected to the first-stage volute outlet 5. The inlet seat 1 can be connected to the second-stage volute inlet 6.

[0037] It should be noted that "the intake seat 1 and the intermediate pipe 2 are an integrally connected structure" means that the intake seat 1 and the intermediate pipe 2 are integrally machined and tightly connected, and used as a two-in-one integrated structure. The two-stage compressor includes a first-stage volute 9 and a second-stage volute 10. The first-stage volute outlet 5 is the air outlet of the first-stage volute 9, and the second-stage volute inlet 6 is the air inlet of the second-stage volute 10.

[0038] The advantages of integrating the air intake 1 and the intermediate pipe 2 into a single pipe structure include:

[0039] (1) The intake seat 1 and the intermediate pipe 2 are combined into one, which reduces the number of parts and makes the structure simple and easy to maintain;

[0040] (2) The internal structure of the compressor is simplified, which not only improves the assembly efficiency of the compressor, but also avoids the introduction of additional assembly errors during the assembly process of the intake seat 1 and the intermediate pipe 2.

[0041] (3) The air intake seat 1 and the intermediate pipe 2 with the integrated connection structure only use one set of molds, which reduces the use of one set of molds and reduces the mold manufacturing cost;

[0042] (4) The intake seat 1 and the intermediate pipe 2 do not need to be produced separately. The number of blanks has been reduced from two to one, which reduces the blank production time, improves the blank production efficiency, and reduces the blank production cost.

[0043] (5) The air intake seat 1 and the intermediate pipe 2 are integrally machined, which reduces the number of processing steps, improves processing efficiency, and reduces processing costs;

[0044] (6) There is no gap between the air inlet seat 1 and the intermediate pipe 2, which reduces the energy loss of gas during transmission and improves the overall efficiency of the two-stage compressor.

[0045] Please see the appendix Figure 3 In some embodiments of this application, the air intake seat 1 includes an air intake pipe 11 that can enter the secondary volute inlet 6 and extend to the air intake of the secondary impeller 8 of the two-stage compressor.

[0046] The two-stage compressor includes a first-stage impeller 7 and a second-stage impeller 8. The first-stage impeller 7 is housed within the first-stage volute 9, and the second-stage impeller 8 is housed within the second-stage volute 10. The inlet pipe 11 is coaxially aligned with the inlet 6 of the second-stage volute. The inlet pipe 11 is sealed and connected to the intermediate pipe 2. Through the inlet pipe 11, gas is efficiently and stably transmitted to the inlet of the second-stage impeller 8, guiding the gas precisely into the second-stage impeller 8.

[0047] In some embodiments of this application, the intake pipe 11 is a constant diameter intake pipe. As mentioned above, the regular shape of the intake pipe 11 facilitates manufacturing and processing.

[0048] Of course, the intake pipe 11 can also be a variable diameter structure, as long as it can guide the gas to the intake port of the second-stage impeller 8 in a leak-proof manner.

[0049] Please see the appendix Figure 1 , 3 In some embodiments of this application, the air intake seat 1 includes a first connecting flange 12, which is connected to the secondary volute inlet 6.

[0050] Please see the appendix Figure 6 Furthermore, the first connecting flange 12 has a plurality of first mounting holes 121 along its circumference, so as to connect the first connecting flange 12 to the secondary volute inlet 6 by means of the first fastener 3.

[0051] It should be noted that a secondary volute inlet flange is provided at the secondary volute inlet 6. The secondary volute inlet flange has multiple first connection holes along its circumference that correspond one-to-one with the first mounting holes 121. The first connection flange 12 is connected to the secondary volute inlet flange. The first fastener 3 passes through the first connection hole and the first mounting hole 121 in sequence to seal the air intake seat 1 to the secondary volute inlet 6.

[0052] As shown above, the intake seat 1 is detachably connected to the secondary volute inlet 6, which facilitates the disassembly, replacement and maintenance of the intake seat 1; the first connecting flange 12 ensures the reliable fixed connection between the intake seat 1 and the secondary volute inlet 6, and also ensures the sealing connection between the two.

[0053] Please see the appendix Figure 1 , 3 In some embodiments of this application, a second connecting flange 21 is provided at the end of the intermediate pipe 2 away from the air inlet seat 1, and the second connecting flange 21 is connected to the outlet 5 of the first-stage volute.

[0054] Please see the appendix Figure 7 Furthermore, the second connecting flange 21 has a plurality of second mounting holes 211 along its circumference, so as to connect the second connecting flange 21 to the first-stage volute outlet 5 by means of the second fastener 4.

[0055] It should be noted that a primary volute outlet flange is provided at the primary volute outlet 5. The primary volute outlet flange has multiple second connection holes along its circumference that correspond one-to-one with the second mounting holes 211. The second connection flange 21 is connected to the primary volute outlet flange. The second fastener 4 passes through the second connection holes and the second mounting holes 211 in sequence to seal and connect the intermediate pipe 2 to the primary volute outlet 5.

[0056] As shown above, the intermediate pipe 2 is detachably connected at the outlet 5 of the first-stage volute, which facilitates the disassembly, replacement and maintenance of the intermediate pipe 2; the second connecting flange 21 ensures the reliable fixed connection between the intermediate pipe 2 and the outlet 5 of the first-stage volute, and also ensures the sealing connection between the two.

[0057] Please see the appendix Figure 3 In some embodiments of this application, the intermediate pipe 2 is provided with an economizer connection port 22.

[0058] It should be noted that the economizer is connected via economizer connection port 22; whether or not to connect the economizer can be selected according to actual needs, offering high flexibility and applicability. The economizer includes two independent passages, namely passage one and passage two; passage one connects the evaporator and condenser, and passage two connects the intermediate pipe 2 and the evaporator; in the economizer, the liquid refrigerant in passage two evaporates and absorbs heat, then re-enters the compressor through economizer connection port 22, while simultaneously lowering the refrigerant temperature in passage one, thereby reducing the unit's subcooling and improving compressor efficiency.

[0059] In some embodiments of this application, the intermediate pipe 2 and the air inlet seat 1 are integrally cast and connected.

[0060] The intermediate pipe 2 and the air intake seat 1 are formed by casting, which is convenient for production and manufacturing. Furthermore, the integrated structure of the intermediate pipe 2 and the air intake seat 1 only uses one set of casting molds, which reduces the use of one set of molds and lowers the mold making cost.

[0061] In summary, this application provides a two-stage compressor that includes the piping structure described above.

[0062] Since the two-stage compressor of this application includes the piping structure described above, the beneficial effects of the piping structure on the two-stage compressor are described above and will not be repeated here.

[0063] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not restrict this application from necessarily using the aforementioned specific details for implementation.

[0064] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0065] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0066] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0067] It should be understood that the qualifying terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0068] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A pipe structure, characterized in that, For connecting the outlet of the first-stage volute and the inlet of the second-stage volute of a two-stage compressor; the piping structure includes: The air intake seat (1) can be connected to the inlet of the secondary volute; The intermediate pipe (2) is connected at one end to the air intake seat (1) and at the other end to the outlet of the first-stage volute. The intermediate pipe (2) and the air inlet seat (1) are integrally connected.

2. The pipe structure according to claim 1, characterized in that, The intake seat (1) includes an intake pipe (11) that can enter the secondary volute inlet and extend to the intake port of the secondary impeller of the two-stage compressor.

3. The pipe structure according to claim 2, characterized in that, The intake pipe (11) is a constant diameter intake pipe.

4. The pipe structure according to claim 1, characterized in that, The air intake seat (1) includes a first connecting flange (12), which can be connected to the secondary volute inlet.

5. The pipe structure according to claim 4, characterized in that, The first connecting flange (12) has a plurality of first mounting holes (121) along its circumference to connect the first connecting flange (12) to the secondary volute inlet by means of a first fastener (3).

6. The pipeline structure according to claim 1, characterized in that, The intermediate pipe (2) is provided with a second connecting flange (21) at one end away from the air inlet seat (1), and the second connecting flange (21) can be connected to the outlet of the first-stage volute.

7. The pipe structure according to claim 6, characterized in that, The second connecting flange (21) has a plurality of second mounting holes (211) along its circumference to connect the second connecting flange (21) to the outlet of the first-stage volute by means of a second fastener (4).

8. The pipe structure according to claim 1, characterized in that, The intermediate pipe (2) is equipped with an economizer connection port (22).

9. The pipe structure according to any one of claims 1-8, characterized in that, The intermediate pipe (2) and the air inlet seat (1) are integrally cast and connected.

10. A two-stage compressor, characterized in that, Includes the pipe structure as described in any one of claims 1-9.

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