Single-flow-channel type inner shell structure

Abstract

The utility model relates to the technical field of multi-stage pumps, in particular to a single-flow-channel type inner shell structure applied to a hydrogenation feeding pump and an ammonium carbamate pump in the petrochemical industry. One end of a long transition flow channel suction chamber is connected with a short transition flow channel at the tail of a pump driving end, and the other end of the long transition flow channel suction chamber is connected with one end of a long transition flow channel; the other end of the long transition runner is connected with the first short transition runner at the non-driving end of the pump; and the first short transition runner at the non-driving end of the pump is connected with the delivery chamber to jointly form an inner shell runner. The short transition flow channels are arranged on the single side of the driving end or the non-driving end of the pump in a staggered mode step by step. According to the technical scheme, the problems that the manufacturing difficulty and cost of a grinding tool are increased due to a double-flow-channel structure in the prior art are solved; the small runner size is easy to generate casting defects, and the yield is low; and the pump efficiency is low.

Description

Technical Field

[0001] This utility model relates to the field of multistage pump technology, and in particular to a single-channel inner shell structure for use in hydrogenation feed pumps and carbamate pumps in the petrochemical industry. Background Technology

[0002] Traditional volute-type double-casing multistage pumps employ a dual-channel structure. This dual-channel design results in a large number of channels, each with a relatively small size. During the casting process, the dual-channel structure increases the difficulty and cost of mold manufacturing, and the smaller channel size hinders the flow of molten metal, making casting defects more likely and resulting in a low first-pass yield. Currently, some pumps suitable for low-flow-rate applications use a method that maintains the same number of channels but increases their size to ensure casting accuracy, but this significantly reduces pump efficiency.

[0003] In view of the problems existing in the above-mentioned prior art, it is necessary to study and design a new type of single-channel inner shell structure to overcome the problems existing in the prior art. Summary of the Invention

[0004] The existing dual-channel structure increases the difficulty and cost of mold manufacturing; the smaller channel size also easily leads to casting defects, low yield, and low pump efficiency. Therefore, a single-channel inner shell structure is provided. This invention mainly adopts a single-channel structure, increasing the channel design size, thereby reducing casting difficulty, facilitating casting, ensuring casting accuracy, and reducing cost losses. Simultaneously, the adaptable impeller designed for low-flow conditions enables the pump to operate efficiently under low-flow conditions.

[0005] The technical means adopted in this utility model are as follows:

[0006] A single-channel inner shell structure includes: a short transition channel, a long transition channel suction chamber, a long transition channel, and a discharge chamber;

[0007] Furthermore, one end of the long transition channel suction chamber is connected to the short transition channel at the end of the pump drive, and the other end is connected to one end of the long transition channel.

[0008] Furthermore, the other end of the long transition channel is connected to the first short transition channel on the non-drive end of the pump;

[0009] Furthermore, the short transition channel at the end of the non-drive end of the pump is connected to the discharge chamber, together forming the inner shell channel.

[0010] Furthermore, short transition channels are arranged in a staggered manner on one side of the pump, either at the drive end or the non-drive end.

[0011] Furthermore, the single-flow-to-throat area of ​​the short transition channel is 541.8 mm². 2 The tongue gap ratio is 1.04.

[0012] Furthermore, the single-flow-to-throat area of ​​the long transition channel is 541.8 mm². 2 The tongue gap ratio is 1.04.

[0013] Furthermore, the single-flow area to the throat of the pressure chamber is 541.8 mm². 2 The tongue gap ratio is 1.04.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The single-channel inner shell structure provided by this utility model reduces the number of channels and increases the channel size through the single-channel design, thereby reducing the casting difficulty and ensuring the casting accuracy.

[0016] 2. The single-channel inner shell structure provided by this utility model can effectively balance part of the radial force by arranging short transition channels in a staggered manner on one side of the pump's drive end or non-drive end.

[0017] 3. The single-channel inner shell structure provided by this utility model can be fitted with an impeller that can be adapted to low flow conditions, ensuring that the pump operates efficiently under low flow conditions.

[0018] In summary, the technical solution of this utility model solves the problems in the prior art, such as the increased difficulty and cost of mold manufacturing due to the dual-channel structure; the tendency of smaller channel dimensions to produce casting defects, resulting in low yield; and low pump efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the flow channel structure of this utility model;

[0021] Figure 2 This is an isometric view of the flow channel structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the impeller structure of this utility model.

[0023] In the diagram: 1. Short transition channel; 2. Long transition channel suction chamber; 3. Long transition channel; 4. Discharge chamber. Detailed Implementation

[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0031] As shown in the figure, this utility model provides a single-channel inner shell structure including: a short transition channel 1, a long transition channel suction chamber 2, a long transition channel 3, and a discharge chamber 4; one end of the long transition channel suction chamber 2 is connected to the short transition channel 1 at the end of the pump drive end, and the other end is connected to one end of the long transition channel 3; the other end of the long transition channel 3 is connected to the first short transition channel 1 at the non-drive end of the pump; the short transition channel 1 at the end of the non-drive end of the pump is connected to the discharge chamber 4, together forming the inner shell flow channel.

[0032] The short transition channel 1 is arranged in a staggered manner on one side of the pump, either at the drive end or the non-drive end.

[0033] The single-flow-to-throat area of ​​short transition channel 1 is 541.8 mm². 2 The tongue gap ratio is 1.04.

[0034] The single-flow-to-throat area of ​​the long transition channel 3 is 541.8 mm². 2 The tongue gap ratio is 1.04.

[0035] The single-flow area to the throat of the discharge chamber 4 is 541.8 mm². 2 The tongue gap ratio is 1.04.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A single-channel inner shell structure, characterized in that: The single-channel inner shell structure includes: a short transition channel (1), a long transition channel suction chamber (2), a long transition channel (3), and a discharge chamber (4); One end of the long transition channel suction chamber (2) is connected to the short transition channel (1) at the end of the pump drive end, and the other end is connected to one end of the long transition channel (3). The other end of the long transition channel (3) is connected to the first short transition channel (1) at the non-drive end of the pump; The short transition channel (1) at the end of the non-drive end of the pump is connected to the discharge chamber (4) to form the inner shell channel together.

2. The single-channel inner shell structure according to claim 1, characterized in that: The short transition channel (1) is arranged in a staggered manner on one side of the pump, either at the drive end or the non-drive end.

3. The single-channel inner shell structure according to claim 1, characterized in that: The single-flow-to-throat area of ​​the short transition channel (1) is 541.8 mm². 2 The tongue gap ratio is 1.

04.

4. The single-channel inner shell structure according to claim 1, characterized in that: The single-flow-to-throat area of ​​the long transition channel (3) is 541.8 mm². 2 The tongue gap ratio is 1.

04.

5. The single-channel inner shell structure according to claim 1, characterized in that: The single-flow area to the throat of the discharge chamber (4) is 541.8 mm². 2 The tongue gap ratio is 1.04.

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