Multi-working-condition chemical process pump with flow expander structure

Abstract

The utility model relates to a multi-working-condition chemical process pump with a flow expander structure, which comprises a pump body, a pump cover, a bearing box and a main shaft, the pump body, the pump cover and the bearing box are sequentially sleeved on the main shaft from left to right, an impeller is arranged in a space formed by the pump body and the pump cover, an oil slinger is arranged in the bearing box, and the flow expander is arranged between the pump body and the pump cover. A first pin hole is formed in the pump cover, a second pin hole is formed in the flow expander, the first pin hole corresponds to the second pin hole in position, a positioning pin is arranged between the first pin hole and the second pin hole, and the flow expander is connected with the pump cover through the positioning pin. The flow expander is installed in the space formed by the pump body and the pump cover, the size of the process pump does not need to be enlarged, the structure is simple, the appearance is attractive, the overflowing amount is controlled through the width of an outlet of the flow expander, and therefore the conveying amount of the pump is adjusted, and the process pump is efficient, energy-saving, safe and environmentally friendly, and in addition, when the conveying amount of the process pump needs to be enlarged, only the flow expander and the impeller need to be replaced. And other parts of the pump body do not need to be replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical process pumps, in particular to a multi-working condition chemical process pump with a diffuser structure. Background Art

[0002] At present, there are many types of pumps, but their structures are different according to different performance requirements and uses. Chemical process pump is one of them. It is mainly composed of pump body, impeller, shaft, bearing housing, mechanical seal and other components. However, in the prior art, the user has a small output in the early stage, and this pump can meet the requirements. If the output is large in the later stage, this pump cannot meet the requirements. In this way, the user can only dismantle this pump and replace it with a pump with a large output to meet the current output requirements, which wastes a lot of money and energy for the user. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-operating chemical process pump with a diffuser structure, which can adjust the flow rate to meet the output requirements without removing the current process pump. It solves the problem in the prior art that when the user's output is small in the early stage, the existing process pump can meet the requirements, but when the output is large in the later stage, the pump cannot meet the requirements and the user has to remove the pump and replace it with a pump with a large output, which wastes capital costs and delays the construction period.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A multi-working condition chemical process pump with a diffuser structure comprises a pump body, a pump cover, a bearing box and a main shaft. The pump body, the pump cover and the bearing box are sequentially mounted on the main shaft from left to right. An impeller is arranged in the space formed by the pump body and the pump cover, an oil slinger is arranged in the bearing box, a diffuser is arranged between the pump body and the pump cover, a first pin hole is arranged on the pump cover, a second pin hole is arranged on the diffuser, the first pin hole corresponds to the second pin hole in position, a locating pin is arranged between the first pin hole and the second pin hole, and the diffuser is connected to the pump cover via the locating pin.

[0006] Furthermore, the width of the gap between the pump body and the pump cover matches the thickness of the diffuser, and the diffuser is fixed between the pump body and the pump cover.

[0007] Furthermore, the size of the liquid outlet of the impeller matches the size of the liquid inlet of the diffuser.

[0008] Furthermore, the gap between the upper surface of the impeller liquid outlet and the liquid inlet hole of the diffuser is 1 mm.

[0009] Furthermore, the diffuser includes arc-shaped blades, a left cover plate and a right cover plate. The left cover plate and the right cover plate are provided with mounting grooves, the arc-shaped blades are inserted into the mounting grooves, and the left and right ends of the arc-shaped blades are respectively welded and fixed to the left cover plate and the right cover plate.

[0010] Furthermore, the mounting groove is a through groove.

[0011] The beneficial effects of the utility model are as follows: the multi-operating chemical process pump with a diffuser structure provided by the utility model, the diffuser frame is installed in the space formed by the pump body and the pump cover, there is no need to expand the volume of the process pump, the structure is simple, the shape is beautiful, the flow rate is controlled by the outlet width of the diffuser, so as to adjust the output size of the pump, it is efficient and energy-saving, safe and environmentally friendly, in addition, when it is necessary to expand the output of the process pump, only the diffuser and the impeller need to be replaced, and there is no need to replace other parts of the pump body, it is easy to use and reliable. The utility model reduces the replacement cycle and the waste of resources and funds by replacing the diffuser and the impeller, and better serves the petrochemical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional schematic diagram of a multi-operating chemical process pump under a small output state in the early stage;

[0013] Figure 2 It is a cross-sectional schematic diagram of a multi-operating chemical process pump under a later large output state;

[0014] Figure 3 It is the left view of the diffuser;

[0015] Figure 4 This is the main view of the diffuser;

[0016] Figure 5 It is the main cross-sectional view of the diffuser;

[0017] Figure 6 Schematic diagram of the diffuser installation gap.

[0018] In the figure: 1, pump body; 2, pump cover; 21, first pin hole; 3, bearing box; 4, oil slinger; 5, main shaft; 6, first bearing; 7, second bearing; 8, impeller; 9, shaft head nut; 10, positioning pin; 11, diffuser; 111, second pin hole; 112, arc blade; 113, left cover plate; 114, right cover plate; 115, mounting groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Among them, the directional nouns such as "up", "down", "left", and "right" mentioned in this article are Figure 1 The orientation is used as a reference.

[0020] Example:

[0021] The utility model relates to a multi-operating condition chemical process pump with a diffuser structure. A diffuser 11 is added to the existing chemical process pump. The flow diffuser 11 is used to adjust the flow rate of the process pump, so that the chemical process pump provided by the utility model can adapt to the requirements of various operating conditions.

[0022] Reference Figure 1 The utility model is a multi-working condition chemical process pump with a diffuser structure, comprising a pump body 1, a pump cover 2, a bearing box 3 and a main shaft 5. The pump body 1, the pump cover 2 and the bearing box 3 are sequentially mounted on the main shaft 5 from left to right. The main shaft 5 is located at one end of the pump body 1 and is equipped with a shaft head nut 9. The bearing box 3 is connected to the main shaft 5 through a first bearing 6 and a second bearing 7. An impeller 8 is arranged in the space formed by the pump body 1 and the pump cover 2, and an oil slinger 4 is arranged in the bearing box 3. The installation of the above-mentioned process pump components is well known to those skilled in the art and will not be repeated here. The innovation point of the utility model is A diffuser 11 is provided in the space formed by the pump body 1 and the pump cover 2. The diffuser 11 is installed by providing a first pin hole 21 on the pump cover 2 and providing a second pin hole 111 on the diffuser 11. The first pin hole 21 and the second pin hole 111 have the same aperture and corresponding positions, that is, the axes of the first pin hole 21 and the second pin hole 111 are on the same straight line. A positioning pin 10 is provided between the first pin hole 21 and the second pin hole 111. When installing, the positioning pin 10 is first installed in the first pin hole 21, and then the position of the second pin hole 111 is aligned with the first pin hole 21. Figure 1 , push the pump body 1 from left to right so that the positioning pin 10 is inserted into the second pin hole 111, thereby connecting the diffuser 11 to the pump cover 2. The width of the gap formed between the pump body 1 and the pump cover 2 is adapted to the thickness of the diffuser 11. When the pump body 1 and the pump cover 2 are connected, the diffuser 11 is just fixed between the pump body 1 and the pump cover 2. The diffuser 11 is stably installed in the gap formed by the pump body 1 and the pump cover 2, and will not shake with the rotation of the impeller 8.

[0023] Reference Figure 1 , the size of the liquid outlet of the impeller 8 matches the size of the liquid inlet of the diffuser 11. At the same time, in order to ensure the parameters and pump efficiency after replacing the diffuser 11 and the impeller 8, the gap between the diffuser 11 and the impeller 8 is guaranteed to be 1mm, that is, Figure 1In the present invention, the gap between the upper surface of the liquid outlet of the impeller 8 and the liquid inlet hole of the diffuser 11 is 1 mm. In the present utility model, the design of the diffuser 11 is determined according to the size of the pump output. When the output is small, a small-diameter diffuser 11 is used, that is, the outlet width of the diffuser 11 is small, and the flow rate is small at this time; when the output is large, a larger-diameter diffuser 11 is used, and the flow rate is large at this time. The pump output can be adjusted by using diffusers 11 of different specifications. In the present utility model, the outlet width of the impeller 8 is adjusted with the model of the diffuser 11 to match the two. When the output is small, the outlet width of the impeller 8 is also small. When the output needs to be increased, the impeller 8 can be replaced, and the large-diameter diffuser 11 can be replaced at the same time, or refer to Figure 2 , directly remove the diffuser 11 and replace it with an impeller 8 with larger parameters, so that the impeller 8 cooperates with the flow channel of the original pump body 1 to complete the incremental delivery.

[0024] Reference Figure 3 , Figure 4 and Figure 5 The diffuser 11 includes an arc-shaped blade 112, a left cover plate 113 and a right cover plate 114. The left cover plate 113 and the right cover plate 114 are provided with a mounting groove 115. The arc-shaped blade 112 is inserted into the mounting groove 115. The mounting groove 115 may be a through groove. During installation, the arc-shaped blade 112 is inserted into the mounting groove 115, and then the arc-shaped blade 112 is fixed to the left cover plate 113 and the right cover plate 114 by welding.

[0025] Working principle:

[0026] The impeller 8 on the main shaft 5 generates centrifugal force under the direct drive of the motor, and the liquid is thrown out of the impeller 8 from the center of the impeller 8 and enters the diffuser 11. When the liquid flows outward along the diffuser 11, the flow channel area gradually increases, and the flow rate slows down evenly. After the kinetic energy is converted into static pressure energy, it enters the volute pump body. The flow channel area in the volute body also gradually increases like the diffuser 11, and the flow rate also slows down evenly, and the kinetic energy is also converted into static pressure energy. At the same time, the outlet part of the pump also gradually expands and becomes a place for energy conversion. The pump generates the required head. At this time, negative pressure is generated in the center of the impeller 8, and the liquid flows from the suction port of the pump to the center of the impeller 8. The pump rotates continuously, and the impeller 8 continuously inhales and discharges liquid.

[0027] When the delivery volume is increased in the later stage, the diffuser 11 and the impeller 8 can be removed from the pump body 1, and the diffuser 11 and the impeller 8 can be redesigned and replaced according to the parameters required in the later stage, and the user's demand for incremental delivery in the later stage can be met without replacing other parts.

[0028] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0029] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A multi-operating chemical process pump with a diffuser structure, comprising a pump body (1), a pump cover (2), a bearing box (3) and a main shaft (5), wherein the pump body (1), the pump cover (2) and the bearing box (3) are sequentially mounted on the main shaft (5) from left to right, an impeller (8) is arranged in a space formed by the pump body (1) and the pump cover (2), and an oil slinger (4) is arranged in the bearing box (3), characterized in that: A diffuser (11) is arranged between the pump body (1) and the pump cover (2); a first pin hole (21) is arranged on the pump cover (2); a second pin hole (111) is arranged on the diffuser (11); the first pin hole (21) and the second pin hole (111) correspond in position to each other; a positioning pin (10) is arranged between the first pin hole (21) and the second pin hole (111); and the diffuser (11) is connected to the pump cover (2) via the positioning pin (10).

2. A multi-operating chemical process pump with a diffuser structure as claimed in claim 1, characterized in that: The width of the gap between the pump body (1) and the pump cover (2) matches the thickness of the diffuser (11), and the diffuser (11) is fixed between the pump body (1) and the pump cover (2).

3. A multi-operating chemical process pump with a diffuser structure as claimed in claim 2, characterized in that: The size of the liquid outlet of the impeller (8) matches the size of the liquid inlet of the diffuser.

4. A multi-operating-mode chemical process pump with a diffuser structure as claimed in claim 2, characterized in that: The gap L between the upper surface of the liquid outlet of the impeller (8) and the liquid inlet hole of the diffuser (11) is 1 mm.

5. A multi-operating-mode chemical process pump with a diffuser structure as claimed in claim 1, characterized in that: The diffuser (11) comprises an arc-shaped blade (112), a left cover plate (113) and a right cover plate (114); the left cover plate (113) and the right cover plate (114) are provided with mounting grooves (115), the arc-shaped blade (112) is inserted into the mounting grooves (115), and the left and right ends of the arc-shaped blade (112) are respectively welded and fixed to the left cover plate (113) and the right cover plate (114).

6. A multi-operating-mode chemical process pump with a diffuser structure as claimed in claim 5, characterized in that: The installation groove (115) is a through groove.

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