JPH0634632Y2 - Pressure pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pressure pump advantageously implemented for pumping a liquid of high viscosity such as a polymer solution.

BACKGROUND ART Such a pressure-feeding pump is used to constantly monitor the viscosity of the liquid in the pressure-feeding line and keep the quality of the liquid stable.
A typical prior art is shown in cross section in FIG.
The left side is shown in the figure. The main shaft 2, which is a gear pump, is operated by the drive shaft 1 driven by the motor. A gear 3 is fixed to the drive shaft 1, and another gear 4 meshes with the gear 3. The metering pump 5 is driven by the drive shaft 1. The inlet 6 of the main pump 2 is connected to a vacuum reaction container or the like. The liquid from the main pump 2 is pumped from the outlet 7 of the main pump 2.

Here, since the viscosity of the fluid is related to the flow rate and the pressure loss of the flow path, the flow rate is fixed by the metering pump 5, and the pressure loss at the throttle (choke) 18, which will be described later, is measured by a pressure gauge to determine the viscosity. is there.

FIG. 11 is a sectional view near the metering pump 5. The flow path 8 communicating with the outlet 7 of the main pump 2 is formed in the main body 9 of the main pump 2. A cover 10 is fixed to the main body 9.
The cover 10 has a flow path 12 communicating with the inlet 11 of the metering pump 5.
Is formed. The flow channel 12 is inclined with respect to the thickness direction of the cover 10, that is, the vertical direction in FIG. Part of the liquid from the outlet 7 of the main pump 2 is supplied to the inlet 11 of the metering pump 5 via the flow paths 8 and 12, and the outlet of this metering pump 5
The liquid from 13 is returned to the inlet 6 of the main pump 2 via the flow paths 14, 15 and 16 formed in the cover 10, and further via the flow path 17 formed in the main body 9. A choke 18 is provided in the flow path 17. In the cover 10, a connection port 20 for connecting to the pressure gauge 19 is formed in the flow path 15. The flow paths 14 and 16 are
It is perpendicular to the thickness direction of the cover 10. The cover 10 has an oval shape, and the flow path 15 is formed from the arc surface 21 of the cover 10 by drilling, and the blind plug 22 is welded and closed.
In such a pressure feed pump, the flow paths 23, 24, 25 of the heat medium are formed to heat the liquid to be pressure fed. The pressure on the upstream side of the throttle 18 is measured by a pressure gauge 19, and the viscosity of the fluid can be known from this.

Problems to be Solved by the Invention In such prior art, the flow path 8 and the inlet of the metering pump 5 are
11 and 11 are communicated with each other by an oblique flow path 12. It is difficult to drill such an oblique flow path 12, and the drill may escape from the surface of the cover 10 at the start of cutting and the flow path 12 may be formed at a position displaced from a predetermined position. A jig for cutting is required to form the flow path 12 with high accuracy.

In addition, the flow passage 17 and the outlet 13 of the metering pump 5 are connected to the flow passages 14, 15, 16
When communicating with each other, the blind plug 22 must be welded to the cover 10 as described above. In this case, thermal stress is generated and cracks are likely to occur.

This flow channel 15 must be accurately formed, otherwise the flow channels 14 and 16 will not be communicated via the flow channel 15.
The flow passage 15 starts to be cut from the arcuate surface 21 of the cover 10, which makes it easy for the drill to escape, making it difficult to form the flow passage 15 at a predetermined angle from a predetermined position.

If the outlet 13 and the flow path 17 are to be communicated with each other by an oblique flow path similar to the flow path 12, the similar problem related to the flow path 12 occurs.

An object of the present invention is to provide a pressure pump that is easy to process and has excellent productivity.

The present invention introduces a part of the liquid from the outlet of the main pump to the inlet of the metering pump, returns the liquid from the outlet of the metering pump to the inlet of the main pump, and In a pressure-feeding pump in which a throttle is provided between the inlet of the main pump and a pressure gauge is arranged on the upstream side of the throttle, a first connecting port communicating with the inlet of the main pump and a second connecting port communicating with the outlet are provided. , The first connection end face, and the third connection port communicating with the inlet of the metering pump, and the fourth connection port communicating with the outlet, facing the second connection end face, respectively, and the first connection end face and the second connection port. A flat flow path forming member is interposed between the connection end face, and the flow path forming member has a groove or an elongated hole continuous with the first connection port and the fourth connection port, a second connection port and a third connection port. A pressure-feed pump characterized by forming a groove or an elongated hole continuous with the mouth. That.

According to the present invention, a flat flow path is formed between the connection port corresponding to the inlet and outlet of the main pump facing the first connection end face and the connection port communicating with the inlet and outlet of the metering pump facing the second connection end face. Since the groove or the long hole formed in the forming member communicates with each other, there is no need to form an oblique flow path as in the above-mentioned prior art, and there is no need to perform welding or the like. It will be easy and productivity will be improved.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a left side view thereof. A drive shaft 31 driven by a motor or the like drives a gear 33 of a main pump 32 which is a gear pump. Another gear 34 meshes with the gear 33. The drive shaft 31 drives a metering pump 35 which is a gear pump. In the main pump 32, the gears 33 and 34 are housed in the main body 36. A front cover 37 and a rear cover 38 are fixed to the body 36.

In connection with the main pump 32 and the metering pump 35, the flow paths 39, 40,
41 is formed. The heat medium for heating the liquid that is pumped by such a pump is the channels 39, 4 via the pipes 42 to 53.
It is heated by the heat medium guided to 0,41. Flange 54
Is coupled to a vacuum reaction vessel. The liquid, which is a high-viscosity polymer solution from the reaction container, is pumped from the inlet 56 by the main pump 32 and introduced from the outlet 57.

FIG. 3 is a simplified exploded perspective view of the pressure pump shown in FIGS. 1 and 2. A circular recess 58 is formed in the rear cover 38, and a flow path forming member is formed in this recess 58.
59 fits in. The flow rate forming member 59 has a metering pump 35.
Is installed.

FIG. 4 is a perspective view of the flow path forming member 59 viewed from the metering pump 35 side. The metering pump 35 has a drive shaft 60, as clearly shown in FIG. 1 and FIG.
The connecting member 62 connected to the end portion 31a of the drive shaft 31 that faces the recess 58 through the insertion hole 61 formed in the flow path forming member 59.
Are connected to each other by a connecting member 62. A gear 63 shown in FIG. 2 is fixed to the drive shaft 60 of the metering pump 35,
Another gear 64 meshes with this gear 63.

5 is a front view of the rear cover 38, FIG. 6 is a front view of the flow path forming member 59 seen from the metering pump 35 side, and FIG. 7 is a view of the flow path forming member 59 side of the metering pump 35. FIG. 8 is a front view as seen, and FIG. 8 is a sectional view in the vicinity of the metering pump 35.

The first connecting end surface 66, which is the bottom of the recess 58 in FIGS. 8 and 3, is perpendicular to the axis of the drive shaft 31. The first connection end surface 66 has
A first connecting port 67 communicating with an inlet 56 of the main pump 32, and an outlet 57
And a second connection port 68 communicating with.

The second connection end face 69 of the metering pump 35 faces a third connection port 70 communicating with the inlet 65a and a fourth connection port 71 communicating with the outlet 65b.

In FIGS. 8 and 3, the flow path forming member 59 has grooves 72 and 73 whose one ends communicate with the first and second connection ports 67 and 68 of the main pump 32, respectively. The other ends of the grooves 72, 73 are connected to the communication holes 74, 75. The communication hole 74 corresponds to the fourth connection port 71 of the metering pump 35.
The other communication hole 75 corresponds to the third connection port 70. A connecting shaft 62 that connects the end 31a of the drive shaft 31 and the drive shaft 60 is inserted into the insertion hole 61.

In FIG. 4, the flow path forming member 59 is formed in a flat plate shape, and the end surface 77 corresponding to the first connecting end surface 66 and the end surface 78 corresponding to the second connecting end surface 69 are the same as those of the drive shaft 31. Perpendicular to the axis. In FIG. 3, O-rings 79 and 80 are provided on the inner circumferences of the grooves 72 and 73. The metering pump 35 has a bolt 81 (3rd
It is screwed to the flow path forming member 59 by (shown). The flow path forming member 59 is attached to the rear cover 3 by a bolt 81a (shown in FIG. 8).
Fixed at 8.

In FIG. 8, a communication hole 82 is formed in the flow path forming member 59 near the one end of the groove 72. The pressure gauge 83 communicates with the communication hole 82.
Are screwed on by screws 84. A tubular diaphragm 85 is inserted across the rear cover 38 and the flow path 86 of the main body 36. In this way, the pressure gauge 83 can detect the pressure on the upstream side of the throttle 85. The communication hole 82, and therefore the detection port of the pressure gauge 83, is a diaphragm 85.
Since it is arranged in the vicinity of the inlet of and substantially concentric, the pressure state of the fluid in the throttle is immediately sensed.
Therefore, it is possible to detect the pressure with high accuracy. The flow path 86 formed in the main body 36 communicates with the inlet 56 of the main pump 32. The flow path 87 communicating with the connection port 68 is
It communicates with the exit 57 at 36. The inlet 56 of the pressure pump is
Since it is connected to a vacuum reaction vessel, the outlet pressure of the throttle 85 becomes almost zero. Further, the inlet pressure of the throttle 85 becomes a considerably large pressure so that the outlet pressure can be ignored. Therefore, without installing a pressure gauge at the throttle outlet,
The measurement of the pressure by 83 is advantageous because the measured value detects the differential pressure across the throttle 85.

Since the pressure gauge 83 is vertically installed and attached to the end surface 78 of the flow path forming member 59, the pressure gauge 83 is covered together with the heat insulating material that covers the metering pump 35, and the heat insulating material can be easily attached. . Further, the pressure gauge 83 does not interfere with the flange connection between the inlet 56 and the outlet 57. On the other hand, according to the mounting mode of the pressure gauge 19 described in relation to the above-mentioned prior art, mounting work of the heat insulating material is difficult. This embodiment solves the problems of the prior art.

Although the main pump 32 is a gear pump in the above-described embodiment, it may have another structure, for example, a screw pump and a vane pump. The metering pump 35 may be a vane pump and other structures instead of a gear pump.

Effects As described above, according to the present invention, it is not necessary to form a drill hole having an oblique axis other than perpendicular to a flat surface,
Alternatively, there is no need to perform welding or the like, which facilitates processing, improves productivity, and improves reliability.

Further, the pressure gauge 83 can detect the pressure on the upstream side of the throttle 85. Since the communication hole 82, and hence the pressure gauge 83, is arranged in the immediate vicinity of the throttle 85, it is possible to detect the pressure with high accuracy.

Furthermore, since the pressure gauge 83 is vertically installed and attached to the end surface 78 of the flow path forming member 59, the pressure gauge 83 is covered together with the heat insulating material that covers the metering pump 35, and the heat insulating material can be easily attached. . Further, the pressure gauge 83 also has an effect of not interfering with the flange connection between the inlet 56 and the outlet 57.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a left side view of the embodiment shown in FIG. 1, and FIG. 3 is FIG. 1 and FIG.
FIG. 4, a simplified exploded perspective view of the pressure pump shown in the figure,
The figure is a perspective view of the flow path forming member 59 seen from the metering pump 35 side,
5 is a front view of the rear cover 38 of the main pump 2, FIG. 6 is a front view of the flow path forming member 59 seen from the metering pump 35 side, and FIG. 7 is a view from the flow path forming member 59 side of the metering pump 35. A front view, FIG. 8 is a sectional view of the vicinity of the metering pump 35, FIG. 9 is a sectional view of the prior art, FIG. 10 is a left side view of the prior art shown in FIG. 9, and FIG. It is a sectional view of the vicinity of the metering pump 5 of the technology. 31 …… Drive shaft, 32 …… Main pump, 35 …… Quantitative pump, 59
...... Flow path forming member, 66 ...... First connection end face, 67 ...... First connection port, 68 ...... Second connection port, 69 ...... Second connection end face, 56 ......
Inlet, 57 ... Exit, 70 ... Third connection port, 71 ... Fourth connection port, 72,73 ... Groove

Claims (1)

[Scope of utility model registration request] 1. A part of the liquid from the outlet of the main pump 32 is guided to the inlet of the metering pump 35, the liquid from the outlet of the metering pump is returned to the inlet of the main pump, and the outlet of the metering pump and the main In a pressure feed pump in which a throttle 85 is provided between the inlet of the pump and a pressure gauge 83 is arranged on the upstream side of the throttle, a first connecting port 67 communicating with the inlet of the main pump and a second connecting port communicating with the outlet. 68 to face the first connection end face, and to face the second connection end face to the third connection port 70 communicating with the inlet of the metering pump and the fourth connection port 71 communicating with the outlet, respectively. A flat flow path forming member 59 is interposed between the connection end surface and the second connection end surface, and in this flow path forming member, a groove 72 and a communication hole 74 continuous with the first connection port 67 and the fourth connection port 71. And a groove 73 and a communication hole 75 which are continuous with the second connection port 68 and the third connection port 70 are formed. The rear cover 38 fixed to the end surface of the body 36 is provided with a recess 58, the flow path forming member 59 is accommodated and fixed in the recess, and the first and second connection ports provided in the rear cover 38 are provided. 67 and 68 respectively communicate with the grooves 72 and 73 of the flow path forming member 59, a communication hole 82 is formed near one end of the groove 72, and the pressure gauge 83 communicates with the communication hole to form the flow path. A pressure feed pump characterized by being vertically screwed to an end surface 78 of a member 59.