JPH068309Y2 - Gear pump - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention 1) Field of Industrial Application The present invention relates to a gear pump that transfers liquid from a suction side to a discharge side of a pump by meshing action of a drive gear and a driven gear.

2) Related Art Conventionally, in this type of gear pump, the pump case has a bearing and a gear insertion opening at a rear end portion, a gear accommodating portion for accommodating the bearing and gears therein, and a front end portion having the gear accommodating portion. Some have a bearing front end support wall that supports the front end face of the bearing. In such a case, the bearings, gears and the like must be taken in and out of the pump case through the opening at the rear end of the pump case. Therefore, at the time of disassembly and repair, in order to take out the bearings and gears housed in the pump case to the outside of the pump case, pull out the shaft to which the gears are fixed and the drawing tool for pulling them out of the case. Formed a hook hole for hanging.

3) Problems to be Solved by the Invention By the way, generally, when a high-viscosity liquid such as a high-viscosity polymer is transferred by a gear pump, the liquid solidifies between the bearing and the end face of the gear, or between the bearing and the shaft to which the gear is fixed. You may get stuck. However, in the conventional gear pump, the hook holes formed in the shaft and the bearing are hooked with a drawing tool to draw them out from the opening of the pump case, so that the liquid is stuck as described above. In some cases, it is difficult to pull them out.

Further, there is a problem that the shaft, the bearing and the like are damaged by the drawing tool.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to disassemble a gear pump easily and without damaging a shaft, a bearing, or the like.

B. Configuration of the Invention 1) Means for Solving the Problems Next, the present invention devised to solve the above problems will be described. The elements of the present invention can be easily associated with the elements of the embodiments described later. Therefore, the reference numerals of the elements of the embodiment are enclosed in parentheses. The reason why the present invention is described in association with the reference numerals of the embodiments described later is to facilitate the understanding of the present invention and not to limit the scope of the present invention to the embodiments.

In order to solve the above-mentioned problems, the present invention provides a front bearing (10a, 11a) and a rear bearing (10b, 11b) which are spaced apart from each other in the front and rear, and the front and rear bearings (10a, 11a, 10b, 11b).
A drive shaft and a driven shaft that are rotatably supported by the bearings, and the front and rear bearings (10a, 11a, 10b, 11b)
Drive gear (18) and driven gear (20) which are meshed with each other and supported by the drive shaft (16) and driven shaft (19), respectively, and the front and rear bearings (10a, 11a, 10b, 11).
b), drive shaft (16), driven shaft (19), drive gear (1
8) and a gear accommodating portion for accommodating the driven gear (20) therein, a bearing and a gear insertion opening (2) are formed at a rear end portion, and a front end surface of the front bearing (10a, 11a) is formed at a front end portion. A gear pump comprising: a pump case (C) provided with a bearing front end support wall (1) for supporting the bearing; and a lid (23) for opening and closing the bearing and the gear insertion opening (2). A disassembly hole (6) that connects the front end surface of the front bearing (11a) that supports the driven shaft (19) to the outside of the pump case (C) on the bearing front end support wall (1) of the pump case (C). To form a closing member (2
It is characterized in that it is opened and closed by 6).

2) Operation According to the gear pump of the present invention described above, the lid body (23)
Is removed to open the bearing and gear insertion opening (2) and the closing member (26) is opened, and a push rod is inserted into the disassembly hole (6) to support the driven shaft (19). By pressing the front end surface of the front bearing (11a), the driven shaft (19) to which the driven gear (20) is fixed and the pair of bearings (11) arranged before and after the driven gear (20).
a, 11b) can be extruded at once through the opening (2) at the rear end of the pump case (C).

3) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the description of the embodiments of the present invention, “forward” is in the direction of arrow X1 in the figure, and “rear” is in the direction of arrow X2 in the figure (see FIG. 1).
Means direction. Further, "left" means the arrow Y1 direction in the drawings (see FIGS. 1 and 2), and "right" means the arrow Y2 direction in the drawings. Furthermore, "above" is Z1 in the figure.
It means the direction, and “downward” means the Z2 direction in the figure.

Furthermore, in the figure, “•” in “○” means an arrow from the back side of the paper to the front side, and “×” in “○” means on the paper surface. It means an arrow pointing from the front to the back.

As shown in FIG. 1, the external gear pump of this embodiment is
The front end portion (the end portion on the right side in FIG. 1) has a bearing front end support wall 1, and the rear end portion is provided with a pump case C having an opening 2 for inserting a bearing and a gear. A suction side flow passage 3a and a discharge side flow passage 4a are formed in the right side wall 3 and the left side wall 4 (see FIG. 2) of the pump case C, respectively.
Further, the pump case C is provided inside the right side wall 3 of the pump case C.
A front side return hole 3b1 and a rear side return hole 3b2 (see FIG. 3) are formed to connect the inside and the suction side flow path 3a.

The bearing front end support wall 1 of the pump case C is formed with a mechanical seal mounting hole 5 as shown in FIG. 1. The mechanical seal mounting hole 5 is a drive shaft through hole 5a.
And communicates with the inside of the pump case C via. Further, the bearing front end support wall 1 is formed with a disassembly hole 6 communicating with the inside and outside of the pump case C. The disassembly hole 6 is open to the inside of the pump case C, has a large diameter and a short axial length, and a pressing plate housing hole 6a, which communicates with the pressing plate housing hole 6a and has a small diameter and an axial length. And a long plug insertion hole 6b. A pressing plate 8 is housed in the pressing plate housing hole 6a via an O-ring 7. Further, a screw-type plug 9 having an operation hole 9a on the front end face is removably inserted into the plug pushing hole 6b.

A pair of front and rear slide bearings 10a, 1 are provided in the pump case C.
0b; 11a, 11b are arranged in two rows vertically, and the two front bearings 10a, 11a and the two rear bearings 10b, 11b are held by keys 12a, 12b so that they cannot move relative to each other. ing. As shown in FIGS. 1 and 2, front lubricating grooves 13a and 14a are formed on the inner peripheral surface and the rear end surface of the front bearings 10a and 11a. Rear lubrication grooves 13b and 14b are formed on the inner peripheral surfaces and front end surfaces of the rear bearings 10b and 11b. The front and rear lubricating grooves 13a, 14a;
Both 3b and 14b communicate with the discharge side flow path 4a. As shown in FIGS. 2 and 3, the two front bearings 10
Recirculation grooves 15a and 15b communicating with the front side recirculation hole 3b1 are formed on the front end faces of the a and 11a, respectively. The front end face of the bearing 11a located below among the bearings 10a and 11a is communicated with the pressing plate housing hole 6a of the disassembling hole 6 and is in contact with the pressing plate 8 housed therein.

A drive shaft 16 is rotatably supported between a pair of front and rear bearings 10a and 10b located above the above. The front end portion of the drive shaft 16 extends to the outside of the pump case C through the drive shaft through hole 5a and the mechanical seal mounting hole 5, and the side surface of the drive shaft 16 has the inside of the mechanical seal mounting hole 5 inside. An engagement pin 17 that protrudes to is fixedly provided. Further, the drive shaft 16 has the pair of bearings 10a and 10b.
The drive gear 18 whose both end faces are supported by the opposite end faces of is fixed.

A driven shaft 19 is rotatably supported between the pair of front and rear bearings 11a and 11b located on the lower side. A driven gear 20, whose both end surfaces are supported by opposite end surfaces of the pair of bearings 11a and 11b, is fixed to the driven shaft 19, and the driven gear 20 meshes with the drive gear 18. A gap 21 is provided between the front end surface of the driven shaft 19 and the pressing plate 8 for avoiding contact between them.

The rear end side opening 2 of the pump case C is openably and closably closed by a lid 23 fixed to the pump case C by a bolt 22. The lid 23 has an inner end surface formed with a return groove 24 that communicates with the rear return hole 3b2 and the rear lubricating grooves 13b and 14b, respectively (see FIGS. 1 and 3).

The mechanical seal arrangement hole 5 and the disassembly hole 6 are rotatably penetrated by the drive shaft 16 and the pump case C.
It is openably and closably sealed by a closing member 26 that is fixed with a bolt 25. Further, an annular sliding contact member 27 with which a rotary contact ring of a mechanical seal, which will be described later, slides is fixed to the inner end surface of the closing member 26.

A mechanical seal M is provided in the mechanical seal installation hole 5.
Are arranged as follows. That is, as shown in FIG. 1, an annular retainer 28 is fitted on the drive shaft 16. The retainer 28 has a housing portion 2 that opens to the front end side.
8a, a plurality of spring accommodating holes 28b, and the engaging pin 17
Engaging groove 28c for engaging with
The retainer 28 is engaged with the drive shaft 1 by the engagement between the retainer 28 and the engaging groove 28c.
It is designed to rotate integrally with 6. The accommodation section 2
A rotary contact ring 29, a wedge-shaped seal member 30, and a pressing ring 31 are housed in the 8a from the front end side, and these members 29, 30, 31 are forwarded by a spring 32 housed in the spring housing hole 28b. Is urged to.
Therefore, the outer peripheral side surface of the wedge-shaped seal member 30 is disposed on the inner peripheral side surface of the rotary contact ring 29, and the wedge-shaped seal member 3
The inner peripheral surface of the front end portion of 0 is pressed against the outer peripheral surface of the drive shaft 16, and the front end surface of the rotary contact ring 29 is pressed against the sliding contact member 27 fixed to the closing member 26. And the drive shaft 16
When is rotated, the front end surface of the rotary contact ring 29 makes sliding contact with the sliding contact member 27, and the inner peripheral surface of the tip end portion of the wedge-shaped sealing member 30 makes sliding contact with the outer peripheral surface of the drive shaft 16. Therefore, the fluid outside the retainer 28 in the mechanical seal mounting hole 5 is a sliding contact portion between the rotary contact ring 29 and the sliding contact ring 27, and the liquid inside the retainer 28 is the wedge-shaped seal member. Sealing is performed at the sliding contact portion between the drive shaft 16 and the drive shaft 16. The mechanical seal M is configured by the components indicated by the reference numerals 27 to 32.

When disassembling the gear pump configured as described above, first, the closing member 26 at the front end of the pump case.
After removing, the mechanical seal M is removed from the drive shaft 16. Then, after removing the lid 23 at the rear end of the pump case and the plug 9 from the disassembly hole 6, a push rod is inserted into the disassembly hole 6, and the front end of the drive shaft 16 is connected to the pump case C. Push it to the side. Then, pump case C
The drive shaft 16 and the drive gear 18 fixed thereto and the rear bearing 10b are extruded from the opening 2 of the above, and the pressing plate 8 is pushed into the pump case C by the push rod, and the driven shaft 19 and the fixed shaft 19 are fixed thereto. The driven gear 20 and the bearings 11a and 11b before and after the driven gear 20 are extruded from the opening 2 of the pump case C at a time. After that, the front bearing 10a remaining in the pump case C is taken out from the opening 2.

Next, the operation of the above embodiment will be described.

When the liquid is transferred from the suction-side flow passage 3a to the discharge-side flow passage 4a, the liquid that has exuded from the discharge-side flow passage 4a through the rear-side lubrication grooves 13b and 14b into the return groove 24 is the rear-side bearings 10b and 1b.
It acts as a lubricating liquid for 1b, and returns to the suction side flow path 3a through the rear side return hole 3b2. Further, the liquid that has exuded from the discharge-side flow path 4a to the front-side lubrication grooves 13a and 14a is
It acts as a lubricating liquid for a and 11a and flows into the drive shaft through hole 5a. Then, from the drive shaft through hole 5a to the return groove 15a,
It recirculates to the suction side flow path 3a through 15b and the front side recirculation hole 3b1, flows from the drive shaft through hole 5a into the mechanical seal arrangement hole 5, and acts as lubricating oil for the mechanical seal M portion.

By the way, if the liquid to be transferred is a high-viscosity liquid such as a high-viscosity polymer, this liquid will cause the bearings 10a, 10b;
11b and the end faces of the gears 18, 20 and the bearings 10a, 1
0b; 11a and 11b may solidify and stick between the outer surfaces of the drive shaft 16 and the driven shaft 19, but in this embodiment, a push rod is inserted through the disassembly hole 6 and a press plate 8 is used. Since the driven shaft 19, the driven gear 20, and the bearings 11a and 11b before and after the driven shaft 19 can be extruded from the opening 2 at a time, the gear pump can be disassembled in a short time and in spite of the liquid clogging as described above. Can be done. Further, since the plug 9 is inserted into the disassembly hole 6, the liquid does not stick to the disassembly hole 6, and therefore the push rod can be smoothly inserted into the disassembly hole 6.

The embodiment of the gear pump according to the present invention has been described above in detail, but the present invention is not limited to the above-mentioned embodiment.
Various small design changes can be made without departing from the present invention described in the utility model registration claim.

For example, in this embodiment, the bearing front end support wall 1 of the pump case is used.
A pressing plate housing hole 6a having a large diameter is formed in the front end surface of the front bearing 11a, and the bearing 11a is pressed through the pressing plate 8 housed in the housing hole 6a. A plurality of small-diameter plug insertion holes 6b communicating with the front end face of 11a are formed, and these plug insertion holes 6b are formed.
It is also possible to directly press the bearing 11a by a plurality of push rods inserted in b. Further, in the present embodiment, an example in which the mechanical seal disposing hole 5 and the disassembling hole 6 are closed by one closing member 26 has been shown, but this can be closed by separate closing members. Moreover, in this case, if the closing member that closes the disassembly hole 6 is formed in a plug shape, the plug 9 can be made unnecessary.

C. Effect of the Invention According to the gear pump of the present invention described above, the disassembly hole that connects the front end surface of the front bearing and the outside of the pump case is formed in the bearing front end support wall of the pump case, and the disassembly hole is closed by the closing member. Since it is closed so that it can be opened and closed, a push rod is inserted through the disassembly hole to press the front end surface of the front bearing, and thereby the driven shaft to which the driven gear is fixed and a pair of bearings arranged before and after the gear. Can be extruded from the opening of the pump case at once. Therefore, even if the liquid to be transferred has a high viscosity and the liquid sticks between the front and rear bearings and the end faces of the driven gear or between the front and rear bearings and the driven shaft, the gear pump can be easily disassembled. You can Further, the gear pump of the present invention does not require the pulling tool to be engaged with the hook holes formed in the shaft and the bearing as in the conventional case, and therefore does not damage them when disassembling.

[Brief description of drawings]

The drawings show one embodiment of the gear pump of the present invention. FIG. 1 is a longitudinal sectional view of the gear pump, and FIG.
A sectional view taken along line 2 and FIG. 3 are sectional views taken along line 3-3 in FIG. 1 ... Bearing front end support wall, 2 ... Opening, 6 ... Disassembly hole, 10
a, 11a ... front bearing, 10b, 11b ... rear bearing, 16 ... drive shaft, 18 ... drive gear, 19 ... driven shaft, 2
0 ... driven gear, 26 ... blocking member, C ... pump case

Claims (1)

[Scope of utility model registration request] 1. A front side bearing and a rear side bearing which are spaced apart from each other in the front and rear direction, a drive shaft and a driven shaft which are rotatably supported by the front and rear bearings, and the front and rear bearings mesh with each other. And a drive gear and a driven gear respectively supported by the drive shaft and the driven shaft, and a gear accommodating portion for accommodating the front and rear bearings, the drive shaft, the driven shaft, the drive gear and the driven gear, and a rear end. A pump case in which a bearing and a gear insertion opening are formed in a portion, and a bearing front end support wall that supports a front end surface of the front side bearing is provided in a front end portion; and a lid that opens and closes the bearing and the gear insertion opening. In the gear pump including the body, a disassembly hole is formed in the bearing front end support wall of the pump case, the disassembly hole communicating the front end surface of the front bearing supporting the driven shaft and the outside of the pump case. Gear pump, wherein a and openably closed by a closing member.