Internal gear pump adapted to pyrrolidone production lines

Abstract

The utility model provides a kind of internal meshing gear pump suitable for pyrrolidone production line, it is related to gear pump technical field including pump body and pump base;The pump base is communicated with the flow outlet of external pyrrolidone production line, and as the flow import end of pump body;Gear structure and main shaft are equipped in the pump body, main shaft is used to control gear structure meshing rotation to transport medium;The main shaft is connected with the rotating rod of inner rotor by coupling two, and the other end is connected with the driving rod of external driving structure by coupling one, by setting bearing one and bearing two in the inside of pump body, using the setting of double-row bearing, the fluency and stability in the rotation process of main shaft are promoted, and then gear structure meshing rotation is better driven, the stable transport of medium is realized;And by setting adjustable sealing structure in the pump body, the sealing property between main shaft and pump body is realized using adjustable sealing structure, and sealing gap is adjusted to compensate wear amount, prolong the service life of sealing system and sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically to an internal meshing gear pump adapted to a pyrrolidone production line. Background Technology

[0002] The internal gear pump uses the principle of internal gear meshing, with the pitch circles of the inner and outer rotors close together on one side, and the other side separated by a "crescent plate" on the pump body. The driving inner rotor on the main shaft drives the inner and outer rotors to rotate in the same direction. At the inlet, the gears separate to create a negative pressure and draw in liquid. At the outlet, the gears continuously engage and mesh to squeeze the liquid out.

[0003] Currently, pyrrolidone production lines in chemical refineries often use internal gear pumps to transport media. The stable output of the media is achieved through the continuous rotation of the main shaft of the internal gear pump. However, since the internal gear pump needs to rotate continuously when transporting media, the sealing structure in contact with the main shaft is prone to wear, resulting in poor overall sealing performance of the gear pump. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an internal gear pump adapted to a pyrrolidone production line, which solves the problem in existing technologies where the sealing structure in contact with the main shaft is prone to wear because the internal gear pump needs to rotate continuously when conveying the medium.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: In this utility model, the internal gear pump adapted to the pyrrolidone production line includes a pump body and a pump base; The pump base is connected to the flow outlet of the external pyrrolidone production line and serves as the flow inlet of the pump body. The pump body is equipped with a main shaft and a gear structure. The main shaft is used to control the meshing and rotation of the gear structure to transport the medium. The main shaft is connected to the inner rotor rod via coupling two, and the other end is connected to the drive rod of the external drive structure via coupling one. The main shaft is equipped with bearing one and bearing two located at both ends of coupling one, respectively; Among them, the second bearing is located in the adjustable sealing structure set in the pump body, and is used to adjust the sealing gap to compensate for wear.

[0006] Furthermore, the adjustable sealing structure includes a bearing housing and two sealing structures. The bearing housing is provided with a through-hole sealing cavity one, a mounting cavity and a sealing cavity two in sequence. The bearing two is located in the mounting cavity, and the two sealing structures two are located in the sealing cavity one and the sealing cavity two respectively. A pressure cap is fitted onto the sealing structure two located inside the sealing cavity two for compression limiting of the sealing structure two; The bearing housing has multiple mounting holes 3. Bolts pass through the corresponding mounting holes 3 and abut against the side of the cover for limiting the cover.

[0007] Furthermore, the end of the bolt that abuts against the gland has flexible rubber protrusions.

[0008] Furthermore, the gland has multiple mounting holes, and bolts pass through the corresponding mounting holes to abut against the sealing structure located in the sealing cavity.

[0009] Furthermore, the bearing housing has multiple mounting holes 2, and bolts pass through the corresponding mounting holes 2 and abut against the sealing structure 2 located in the sealing cavity 1.

[0010] Furthermore, bushing one, bushing two, and bushing three are installed on the main shaft; The first bushing is located inside the first coupling, the second bushing is located inside the second coupling, and the third bushing is located inside the second sealing cavity. The end of the bushing near the bearing housing extends into the bearing housing and abuts against the bearing.

[0011] Furthermore, the bearing housing is provided with mounting holes four, and bolts are passed through the corresponding mounting holes four to achieve a detachable and fixed connection between the bearing housing and the pump body.

[0012] Furthermore, a sealing structure is installed inside the pump body. The sealing structure is fitted onto the outer wall of the main shaft and located between the bearing and the bushing.

[0013] (III) Beneficial Effects This invention provides an internal gear pump adapted for pyrrolidone production lines. Compared with existing technologies, it has the following advantages: By installing bearing one and bearing two inside the pump body and utilizing the double-row bearing configuration, the smoothness and stability of the main shaft rotation process are improved, thereby better driving the gear structure to mesh and rotate, and achieving stable delivery of the medium. Furthermore, by setting an adjustable sealing structure inside the pump body, the sealing between the main shaft and the pump body can be achieved, and the sealing gap can be adjusted to compensate for wear, thereby extending the service life of the sealing system and improving the sealing effect. Attached Figure Description

[0014] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A cross-sectional view of an internal gear pump adapted for a pyrrolidone production line; Figure 2 for Figure 1 A schematic diagram of the structure of the bearing housing.

[0016] Figure label: 1. Pump body; 2. Coupling 1; 20. Shaft sleeve 1; 21. Bearing 1; 211. Sealing structure 1; 22. Bearing 2; 221. Sealing structure 2; 222. Gland; 223. Mounting hole 1; 3. Coupling 2; 30. Shaft sleeve 2; 4. Main spindle; 40. Bushing three; 5. Internal rotor; 6. External rotor; 7. Crescent plate; 8. Bearing housing; 80. Mounting cavity; 81. Sealing cavity one; 811. Mounting hole two; 82. Sealing cavity two; 821. Mounting hole three; 822. Mounting hole four; 9. Pump base. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] This application provides an internal gear pump adapted to a pyrrolidone production line, which solves the problem in the prior art where the sealing structure in contact with the main shaft is prone to wear because the internal gear pump needs to rotate continuously when conveying the medium, thus improving the overall sealing effect of the internal gear pump.

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] Example: like Figure 1 As shown, an internal gear pump adapted to a pyrrolidone production line includes a pump body 1 and a pump base 9. The pump base 9 is connected to the flow outlet of the external pyrrolidone production line and serves as the flow inlet of the pump body 1. The pump body 1 is equipped with a main shaft 4 and a gear structure. The main shaft 4 is used to control the meshing and rotation of the gear structure to transport the medium. The main shaft 4 is connected to the rotating rod of the inner rotor 5 through coupling 2 3, and the other end is connected to the drive rod of the external drive structure through coupling 1 2. The main shaft 4 is provided with bearing 21 and bearing 22 located at both ends of the coupling 2. Among them, bearing 22 is located in the adjustable sealing structure set in the pump body 1, and the sealing gap is adjusted by the adjustable sealing structure to compensate for the amount of wear.

[0021] By setting bearing 21 and bearing 22 inside the pump body 1, the smoothness and stability of the main shaft 4 during rotation are improved by using the double row bearing configuration, thereby better driving the gear structure to mesh and rotate, and realizing stable delivery of the medium. Furthermore, by setting an adjustable sealing structure inside the pump body 1, the sealing between the main shaft 4 and the pump body 1 can be achieved by adjusting the sealing gap to compensate for wear, thereby extending the service life of the sealing system and improving the sealing effect.

[0022] like Figures 1-2 As shown, the adjustable sealing structure includes a bearing housing 8 and two sealing structures 221; The bearing housing 8 is provided with a through sealing cavity 1 81, a mounting cavity 80 and a sealing cavity 2 82 in sequence. The bearing 22 is located in the mounting cavity 80, and the two sealing structures 221 are located in the sealing cavity 1 81 and the sealing cavity 2 82 respectively. A pressure cap 222 is fitted onto the sealing structure 221 located inside the sealing cavity 22, for compression limiting of the sealing structure 221; The bearing housing 8 has multiple mounting holes 821. Bolts pass through the corresponding mounting holes 821 and abut against the side of the pressure cover 222 for limiting the position of the pressure cover 222.

[0023] It should be noted that the end of the bolt that abuts against the gland 222 has flexible rubber protrusions so that the bolt can limit the abutment of the gland 222.

[0024] By opening mounting hole 3 821 on the adjustable sealing structure, and using bolts passing through mounting hole 3 821 to abut and fix the gland 222 of the compression sealing structure 221, the sealing gap can be adjusted to compensate for wear by controlling the degree to which the gland 222 compresses the sealing structure 221. This solves the problem in the prior art where the sealing structure in contact with the main shaft 4 is prone to wear because the internal gear pump needs to rotate continuously when conveying the medium, thus improving the overall sealing effect of the internal gear pump.

[0025] Specifically, the bearing housing 8 is provided with mounting holes 822, and the bearing housing 8 and the pump body 1 are detachably fixedly connected by bolts passing through the corresponding mounting holes 822. During application, a sealing gasket is provided between the outer wall of the bearing housing 8 and the inner wall of the pump body 1 to enhance the overall sealing performance of the pump body 1.

[0026] like Figure 1 As shown, the pressure cap 222 has multiple mounting holes 223, and bolts pass through the corresponding mounting holes 223 to abut against the sealing structure 221 located in the sealing cavity 82, thereby enhancing the sealing effect of the sealing structure 221.

[0027] like Figure 2 As shown, the bearing housing 8 has multiple mounting holes 811, and bolts pass through the corresponding mounting holes 811 to abut against the sealing structure 221 located in the sealing cavity 81, thereby enhancing the sealing effect of the sealing structure 221.

[0028] It should be noted that, in practical applications, the bolts that abut against the sealing structure 221 are all equipped with flexible rubber protrusions to protect the sealing structure 221. Specifically, sealing structure 221 adopts a skeleton seal.

[0029] like Figures 1-2 As shown, bushing 20, bushing 30 and bushing 40 are installed on the main shaft 4; The first bushing 20 is located inside the first coupling 2, the second bushing 30 is located inside the second coupling 3, and the third bushing 40 is located inside the second sealing cavity 82; The end of the bushing 20 near the bearing housing 8 extends into the bearing housing 8 and abuts against the bearing 22.

[0030] By setting bushing 1 20, bushing 2 30 and bushing 3 40, it is convenient for coupling 1 2 and coupling 2 3 to connect the rotating rod, the driving rod and the main shaft 4; Meanwhile, the end of the bushing 20 near the bearing housing 8 extends into the bearing housing 8. After the bearing housing 8 is installed, the bearing housing 8 is fitted onto the bushing 20 to enhance the stability of the bearing housing 8 installed on the pump body 1.

[0031] like Figure 1 As shown, a sealing structure 211 is installed inside the pump body 1. The sealing structure 211 is sleeved on the outer wall of the main shaft 4 and located between the bearing 21 and the bushing 30. By adding a sealing structure 211, and using the sealing structure 211 and two sealing structures 221, a multi-layer seal is achieved for the pump body 1, thereby enhancing the overall sealing effect of the pump body 1.

[0032] Among them, the sealing structure 211 is a mechanical seal. It should be noted that a crescent plate 7 is installed on the pump body 1, and the gear structure includes an inner rotor 5 and an outer rotor 6. The pitch circles of the inner and outer rotors are close to one side, and the other side is separated by the crescent plate 7 on the pump body 1. During operation, the external drive structure controls the drive rod to rotate, which in turn drives the main shaft 4 connected by coupling 2 to rotate. The rotation of the main shaft 4 further drives the rotating rod on the inner rotor 5 connected by coupling 3 to rotate. Using the internal gear meshing principle, the rotation of the inner rotor 5 drives the outer rotor 6 to rotate in the same direction. At the inlet, the gears separate to form a negative pressure and draw in liquid. At the outlet, the gears continuously engage and mesh to squeeze the liquid out. The working principle of the internal gear pump of this application is the same as that of the existing internal gear pump, which is prior art and will not be described in detail here. The bearings 21, 22, 2, 3, 20, 30, and 40 mounted on the main shaft 4 are all conventional structures used in existing machinery. The inner rings of bearing 21 and 22 rotate with the rotation of the main shaft 4, which makes the rotation of the main shaft 4 smoother. They can be installed using conventional methods such as interference fit, and their usage is a conventional technology in existing machinery, so it will not be described in detail here.

[0033] It should be noted that the conveying medium in the pyrrolidone production line in the refining workshop is a mixture of PVP (N-vinylpyrrolidone) and water, with a medium temperature of 80-85℃. During the conveying process, the medium enters the pump body 1 through the pump base 9 and is conveyed through the gear structure. Due to the characteristics of the conveying medium, this application aims to better utilize the internal gear pump in the pyrrolidone production line of the chemical refinery: In this application, the pump body 1 and shaft sleeve components are made of S30408 ​​to improve the basic corrosion resistance; the rotors (outer rotor 6 and inner rotor 5) are made of S31608 to enhance resistance to PVP mixture corrosion; the main shaft 4 is made of S31608 to improve strength and corrosion resistance; the bearing housing is made of S30408 ​​to match the material of the pump body 1 and reduce assembly clearance; the first sealing structure 211 and the second sealing structure 221 are made of graphite, and the key friction surfaces and the friction contact surfaces of the crescent plate are coated with ceramic to enhance their surface wear resistance and reduce friction loss. Based on the corrosiveness of the PVP mixture and the operating conditions of 80-85℃, a material combination of "S30408 ​​(pump body 1 / bearing housing 8) + S31608 (rotor) + S31608 (main shaft 4) + graphite sealing structure + S31608 crescent plate shaft ceramic spraying" is adopted to balance corrosion resistance, wear resistance and cost control.

[0034] In summary, compared with existing technologies, it has the following beneficial effects: 1. By setting bearing 21 and bearing 22 inside the pump body 1, the smoothness and stability of the main shaft 4 during rotation are improved by using the double row bearing configuration, thereby better driving the gear structure to mesh and rotate, and realizing stable delivery of the medium. Furthermore, by setting an adjustable sealing structure inside the pump body 1, the sealing between the main shaft 4 and the pump body 1 can be achieved by adjusting the sealing gap to compensate for wear, thereby extending the service life of the sealing system and improving the sealing effect.

[0035] 2. By opening mounting holes 3 821 on the adjustable sealing structure, bolts are used to pass through mounting holes 3 821 to abut and fix the gland 222 of the compression sealing structure 221. Then, by controlling the degree to which the gland 222 compresses the sealing structure 221, the sealing gap is adjusted to compensate for wear. This solves the problem in the prior art that the sealing structure in contact with the main shaft 4 is prone to wear because the internal gear pump needs to rotate continuously when conveying the medium, thus improving the overall sealing effect of the internal gear pump.

[0036] 3. By providing multiple mounting holes 223 on the gland 222 and by passing bolts through the corresponding mounting holes 223 and abutting against the sealing structure 221 located in the sealing cavity 82, the sealing effect of the sealing structure 221 is enhanced.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An internal gear pump adapted to a pyrrolidone production line, characterized in that, Includes pump body (1) and pump base (9); The pump base (9) is connected to the flow outlet of the external pyrrolidone production line and serves as the flow inlet of the pump body (1). The pump body (1) is provided with a main shaft (4) and a gear structure. The main shaft (4) is used to control the meshing and rotation of the gear structure to transport the medium. The main shaft (4) is connected to the rotating rod of the inner rotor (5) through coupling two (3), and the other end is connected to the driving rod of the external driving structure through coupling one (2); The main shaft (4) is provided with bearings 1 (21) and bearing 2 (22) located at both ends of coupling 1 (2); Among them, bearing 2 (22) is located in the adjustable sealing structure set in the pump body (1) and is used to adjust the sealing gap to compensate for wear.

2. The internal gear pump adapted for a pyrrolidone production line as described in claim 1, characterized in that, The adjustable sealing structure includes a bearing housing (8) and two sealing structures (221). The bearing housing (8) is provided with a through sealing cavity one (81), a mounting cavity (80) and a sealing cavity two (82) in sequence. The bearing two (22) is located in the mounting cavity (80), and the two sealing structures two (221) are located in the sealing cavity one (81) and the sealing cavity two (82) respectively. A pressure cap (222) is fitted on the sealing structure two (221) located in the sealing cavity two (82) for compression limiting of the sealing structure two (221); The bearing housing (8) has multiple mounting holes (821). Bolts pass through the corresponding mounting holes (821) and abut against the side of the cover (222) for limiting the cover (222).

3. The internal gear pump adapted for a pyrrolidone production line as described in claim 2, characterized in that, The end of the bolt that abuts against the gland (222) has flexible rubber protrusions.

4. An internal gear pump adapted for a pyrrolidone production line as described in claim 2 or 3, characterized in that, The pressure cap (222) has multiple mounting holes (223), and bolts pass through the corresponding mounting holes (223) and abut against the sealing structure (221) located in the sealing cavity (82).

5. The internal gear pump adapted for a pyrrolidone production line as described in claim 4, characterized in that, The bearing housing (8) has multiple mounting holes (811) and bolts pass through the corresponding mounting holes (811) to abut against the sealing structure (221) located in the sealing cavity (81).

6. The internal gear pump adapted for a pyrrolidone production line as described in claim 2, characterized in that, The main shaft (4) is equipped with bushing one (20), bushing two (30) and bushing three (40). The first bushing (20) is located inside the first coupling (2), the second bushing (30) is located inside the second coupling (3), and the third bushing (40) is located inside the second sealing cavity (82). The end of the bushing one (20) near the bearing seat (8) extends into the bearing seat (8) and abuts against the bearing two (22).

7. The internal gear pump adapted for a pyrrolidone production line as described in claim 2, characterized in that, The bearing housing (8) is also provided with mounting holes four (822), and the bearing housing (8) and the pump body (1) are detachably fixedly connected by bolts passing through the corresponding mounting holes four (822).

8. The internal gear pump adapted for a pyrrolidone production line as described in claim 1, characterized in that, The pump body (1) is equipped with a sealing structure (211) inside. The sealing structure (211) is sleeved on the outer wall of the main shaft (4) and located between the bearing (21) and the bushing (30).

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