JPH07217551A - High pressure pump - Google Patents

Abstract

PURPOSE:To provide a high pressure pump which is constituted to prevent the occurrence of corrosion owing to treatment liquid and prevent deterioration of quality of the treatment liquid. CONSTITUTION:A reciprocating type high pressure pump 1 comprises an inner sleeve 32 mounted on a high pressure cylinder 12; a balance piston 33 arranged in the vicinity of the inner surface of the end cover 16 of the high pressure cylinder 12; a cap 34 fixed to the end of a plunger 11 in the high pressure cylinder 12 and having a seal making slide with the inner peripheral surface of the inner sleeve 32; and a pressure liquid chamber 35 connected to an external liquid feed system. Further, a gap is provided between an end cover 16 and a balance piston 33, and a pressure water chamber 36 is provided between the inner sleeve 32 and the high pressure cylinder 12 and extends from a cap 34 and is provided between the inner peripheral surface of the inner sleeve 32 and the outer peripheral surface of the plunger 11 and connected to fresh water feed pipe 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure pump used in a high pressure liquid continuous processing apparatus and the like.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show two examples of conventional high pressure pumps. FIG. 4 shows a rod seal type high pressure pump, and pump 1 is a double-acting plunger type hydraulic cylinder. 10, a plunger 11 that operates as a high-pressure piston, and a pair of high-pressure cylinders 12, 12 connected to both ends of the hydraulic cylinder 10. 13 is a piston of the hydraulic cylinder 10, 14 is a hydraulic cylinder 10 in the high-pressure cylinder 12 via a spacer 15.
Rod seal type packing provided at the side position, 16 is an end cover of the high pressure cylinder 12, 17 is a seal cover on the inner surface of the end cover 16, 18 is the main body of the high pressure cylinder 12, the end cover 16, the tip of the plunger 11 and the rod. Seal type packing 14
A source liquid pressurizing chamber formed between the end cap 16 and
The pressurizing chamber 18 and the external raw material pipes 20 and 21 formed inside
Is a raw material liquid flow path communicating with, and 22 and 23 are check valves provided on the outer raw material pipes 20 and 21 on the inlet and outlet sides of the pump, 2
4 is a hydraulic cylinder 1 that slides into the plunger 11.
It is a rod seal type packing with the oil chamber of 0.

FIG. 5 shows a piston seal type high-pressure pump, which includes a rod seal type packing 14 and a spacer 1 shown in FIG.
Instead of 5, the piston seal type packing 25 is provided near the tip of the plunger 11. In the high-pressure pump as described above, the piston 13 of the hydraulic cylinder 10 is reciprocally driven to the left and right by the hydraulic oil supplied from the drive hydraulic unit 2 (FIG. 1) described later, whereby the right plunger 11 of FIG. 4 is retracted. And the pressure chamber 1 on this side
The low-pressure raw material liquid is sucked from the inlet pipe 20 through the check valve 22 and the flow path 19 into the pipe 8, and at the same time, the left plunger 1
1, the raw material liquid in the pressurizing chamber 18 on this side is pressurized to a pressure inversely proportional to the inner diameter ratio of the hydraulic cylinder 10 and the high pressure cylinder 12, and passes through the flow path 19 and the check valve 23. It is sent to the outlet pipe 21. In this way, the reciprocating drive of the piston 13 causes the raw material liquid to be alternately and continuously sent from the left and right high-pressure cylinders 12 to the high-pressure container 6.

[0004]

In the conventional apparatus shown in FIGS. 4 and 5, the pressure-resistant portion of the entire pump is generally made of high-strength steel or the like due to strength problems. However, when such a pump is continuously operated using an acidic liquid such as fruit juice or an edible or medicinal liquid as a treatment liquid, high-strength steel and the like have poor corrosion resistance. Is likely to occur and there is a risk of damage under high pressure operation. Therefore, it has been attempted to manufacture the pump pressure resistant portion with a corrosion-resistant material, but since there are few suitable corrosion-resistant materials, there is no choice but to use an expensive material, which has a drawback of significantly increasing the cost. Further, in the conventional device as described above, the rod seal packing 14 (Fig. 4) and the piston seal type packing 25 (Fig. 5) are exposed in the pressurizing chamber 18, and the high pressure in the pressurizing chamber 18 is Since one side of the packing receives and slides by abrasion, there is a quality defect that the abrasion powder of the packing 14 and 25 is mixed in the processing liquid. The present invention solves various problems in the above-mentioned conventional apparatus, prevents fatigue corrosion due to an acid solution of a high-pressure pump of this kind, and prolongs its life, and at the same time, reduces the overall cost in manufacturing and operation, and An object of the present invention is to provide a high-pressure pump that makes it possible to prevent deterioration of the quality of the processing liquid.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in a reciprocating high-pressure pump, an inner sleeve detachably mounted on the inner surface of the high-pressure cylinder body and an inner surface of the end lid of the high-pressure cylinder are slid in the axial direction. A balance piston that is movably provided, a cap that is removably fixed to the end of the plunger that moves in the high-pressure cylinder, and a cap that is provided on the outer periphery with a seal that slides in contact with the inner peripheral surface of the inner sleeve, the inner sleeve, the balance piston, and A pressurized liquid chamber surrounded by a cap and connected to an external liquid supply system, a gap between the end cover and the balance piston, a space between the inner peripheral surface of the inner sleeve and the inner peripheral surface of the high pressure cylinder body, and a rear portion from the cap. The inner sleeve inner surface and the plunger outer surface are provided in communication with a separated section and connected to an external fresh water supply system. It made of and a pressure water chamber, it is an unit for which a problem solution. In the present invention, any one or some or all of the inner sleeve, the balance piston, the cap and the end cover of the pump are made of a corrosion resistant material, and the other pump main body is made of a pressure resistant material so as to have a combined configuration. Further, a pressure gauge is provided in the pressurizing water chamber side pressurizing pipe line shut off by the fresh water supply type valve, and the pressure water chamber pressure signal detected by the pressure gauge is fed back to the control unit of the high pressure pump. This is a means for solving the problem.

[0006]

According to the present invention, the raw material liquid pressurizing chamber of the high pressure pump is surrounded by the inner sleeve, the balance piston and the piston seal type cap, and the liquid pressure rise in the pressurizing chamber is balanced with the inner sleeve. It is not necessary to form a high-pressure seal by raising the pressure of the enclosed fresh water in the pressurized water chamber that communicates between the piston and the back surface of the cap to the same pressure, resulting in pressure balance on both sides of the balance piston and the seal portion of the cap. Further, the seal packing is not exposed in the pressurizing chamber, and the packing wear powder is not mixed in the processing liquid. Since the inner sleeve, balance piston and cap do not function as pressure resistant members,
Corrosion-resistant materials such as S316 can be used, and since these parts are removable, they can be replaced and used. If a pressure gauge for detecting the pressure in the pressurized water chamber is installed in the fresh water pipe system communicating with the pressurized water chamber and the detected pressure signal in the pressurized water chamber is fed back to the control device of the high pressure pump, the hydraulic system or the processing raw material liquid is directly detected. Instead, it monitors the fluctuations and abnormalities of the applied pressure, and responds to pump troubles by taking quick action such as emergency stop with automatic control.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIGS. 2 and 3 show the embodiments of the present invention. In the figure, the same parts as those of the conventional one are indicated by the same reference numerals as those in FIG. 4 or FIG. Now, referring to FIG. 1, a high pressure liquid continuous pressurizing apparatus to which a high pressure pump according to an embodiment of the present invention is applied will be described.
Is a hydraulic unit for driving the high pressure pump, 3 is a warmer connected to the inlet side of the pump 1, 4 is a low pressure pump, 5 is a raw material liquid tank to be treated, and 6 is connected to the outlet side of the high pressure pump 1. The high-pressure container for pressurizing the raw material liquid, and 7 and 8 are depressurizing orifice nozzles and coolers connected to the outlet side of the high-pressure container 6 in a plurality of stages. In FIG. 2, 30 is a rod seal type packing provided in contact with a holding ring 31 fixed inside the main body near the hydraulic cylinder 10 side of the high pressure cylinder 12, 32 is the high pressure cylinder 12 between the packing 30 and the end cover 16. An inner sleeve detachably attached to the inner surface of the body of the body 33, an end cover 16 and an inner sleeve 32.
A balance piston provided in the high-pressure cylinder 12 so as to be in contact with is a piston seal type cap 34 that is detachably fixed to the tip of the plunger 11.

Further, 35 is a pressurizing chamber for the raw material liquid which is sealed and enclosed by the inner sleeve 32, the balance piston 33 and the cap 34, and 36 is the balance piston 33.
Of the inner surface of the inner sleeve 32 between the inner sleeve 32 and the inner surface of the main body of the high-pressure cylinder 12 and the surface of the inner sleeve 32 from the cap 34 to the packing 30, and the outer peripheral surface of the plunger. Is a fresh water flow path formed in the end cover 16 in communication with the pressurized water chamber 36, and 38 is connected to the pressurized chamber 35 and the balance piston 33
And a raw material liquid flow path formed in the end cover 16. The raw material liquid passage 38 is connected between the raw material liquid inlet side pipe 20 and the outlet side pipe 21 and the fresh water passage 37 is connected to a fresh water supply pipe 39. Reference numeral 40 is a fresh water tank, 41 is a low-pressure fresh water pump, 42 is a check valve on the fresh water supply pipe 39, 43 is an electric pressure gauge with an oscillator or the like provided closer to the high-pressure cylinder 12 than the check valve 42, 44 Is a control device for the pump driving hydraulic unit 2, and 45 is a wireless or wired signal line connecting the pressure gauge 43 and the control device 44.

FIG. 3 is an enlarged view of the main body of the high pressure cylinder 12 in FIG. 2, in which the inner circumference of the inner sleeve 32 in contact with the end cover 16 is formed in a step 32a having a slightly larger diameter, and the balance piston 33 is The cylindrical portion 3 is provided slidably in the axial direction in the step portion 32a and projects to the rear surface of the central portion.
3a is slidably inserted into a corresponding circular hole 16a in the center of the end cover 16 so as to be guided, and a step 32 of the inner sleeve is provided via O-ring packings 46 and 47.
a and the wall surface of the circular hole 16a of the end cover 16 are in contact with each other to keep the seal. Further, the gap between the end face of the cylindrical portion 33a of the balance piston 33 and the bottom of the circular hole 16a of the end lid 16 is the raw material liquid flow path, and the gap between the inner end face of the end lid 16 and the back face of the balance piston 33 is opposite. Constitutes a fresh water pressurizing chamber 36. The rear fresh water pressurizing chamber 36 of the inner sleeve 32 is composed of a flow path on a mesh and has a plurality of communication holes 36a and 36b at both ends, and the balance piston 33
It communicates with the fresh water pressurizing chamber 36 on the back of the cap and the fresh water pressurizing chamber 36 on the rear of the cap 34. 48 is an O-ring packing provided on the main surface of the cap 34, and 49 is the cylinder 1 of the end cover 16.
2 is an O-ring packing provided on the surface facing the inner surface. A fresh water flow path 37 formed in the end cover 16 communicates with a fresh water pressurizing chamber 36 on the rear surface of the balance piston 33, and further, the end cover 16 is provided.
And the raw material liquid flow path 38 formed in the balance piston 33
Communicates with the external raw material pipes 20 and 21 from the pressurizing chamber 35 through the gap in the circular hole 16a.

Next, the operation of the high pressure pump 1 in the embodiment shown in FIGS. 1 to 3 will be described. In FIG. 2, the control device 44 reciprocally drives the piston 13 of the high-pressure pump 1 left and right via the hydraulic unit 2 for driving the hydraulic pump. First, when the piston 13 is driven to the left and the left plunger 11 is pushed out, the raw material liquid sucked into the left pressurizing chamber 35 becomes a high pressure inversely proportional to the cylinder inner diameter ratio of the hydraulic cylinder 10 and the high pressure cylinder 12. It is pressurized and sent to the outlet pipe 21 through the flow path 38. At this time, the raw material liquid to be pressurized in the pressurizing chamber 35 pushes the balance piston 33 to pressurize the fresh water in the pressurizing water chamber 36 to the same pressure, and the inner sleeve 32, the balance piston 33 and the cap 34 respectively on both front and back sides. The pressure balance between the raw material liquid and the fresh water is maintained. As a result, the balance piston 33 and the cap 34
The O-ring packings 46, 47, and 48 are balanced in pressure on both sides so that one-sided load is not applied, and it is not necessary to seal ultra-high pressure, and good sealing is possible even with simple sealing. Further, at this time, the rod seal type packing 30 at the back of the high pressure cylinder 12 is shielded by the O ring packing 48 of the cap 34 and is not exposed in the pressurizing chamber 35.
Since the raw material liquid is no longer touched, the problem that the abrasion powder of the packing is mixed into the pressurized raw material liquid as in the conventional case is eliminated. In parallel with this operation, the right side high pressure cylinder 1 of the pump 1
In 2, the low pressure raw material liquid is sucked into the right pressurizing chamber 35 from the right raw material inlet pipe 20 by pulling in the plunger 11. Also in the right side pressurizing chamber 35, the pressures in the pressurizing chamber 35 and the pressurizing water chamber 36 are automatically balanced, and the same operation as described above is maintained.

Under the structure described above, the inner sleeve 32, the balance piston 33, the cap 34 and the end cover 1 are provided.
All of 6 or any or some of them that are easily corroded
Made of corrosion resistant material such as US316 and other pump body is SU
If it is made of a pressure resistant material such as S630 and has a combined configuration, the corrosion resistance of the portion in contact with the acidic pressurized raw material liquid is increased, the moving time of the pump 1 is lengthened, and only the corrosion resistant material parts are exchanged for use. By doing so, the life of the pump 1 can be dramatically increased. Further, under the configuration described above,
When the pressure in the pressurized water chamber 36 detected by the pressure gauge 43 provided on the fresh water supply pipe 39 of the end cover 16 and the check valve 42 is fed back to the control device 44 for driving the pump 1, a hydraulic drive system is provided. Alternatively, it is possible to detect an abnormality of the pump 1 without directly targeting the pressurized raw material liquid, and thus it is possible to take a prompt response such as an emergency stop by incorporating it in the automatic control system.

[0012]

As described above in detail, according to the present invention, in a reciprocating high-pressure pump, an inner sleeve detachably mounted on the inner surface of the high-pressure cylinder main body and an inner surface of the end lid of the high-pressure cylinder are slid in the axial direction. A balance piston that is movably provided, a cap that is removably fixed to the end of the plunger that moves in the high-pressure cylinder, and a seal that is provided on the outer periphery to contact and slide with the inner peripheral surface of the inner sleeve, the inner sleeve and the balance piston. And a pressurized liquid chamber surrounded by a cap and connected to an external liquid supply system,
It communicates with the gap between the end cover and the balance piston, between the outer peripheral surface of the inner sleeve and the inner peripheral surface of the high-pressure cylinder body, and from the cap to a partitioned section between the inner peripheral surface of the rear inner sleeve and the outer peripheral surface of the plunger. By being provided with a pressurized water chamber connected to an external fresh water supply system,
It eliminates the exposure of the rod seal type packing of the high-pressure cylinder to the pressure chamber, prevents the abrasion powder of the packing from mixing into the pressurized liquid, and automatically balances the pressure of the pressure chamber and the pressure of the pressurized water chamber. It is possible to reduce the load on the strength of the seal and to reduce wear and deterioration of the seal portion. Further, either or some or all of the inner sleeve, the balance piston, the cap and the end cover of the pump are made of a corrosion resistant material, and the other pump main body is made of a pressure resistant material so as to have a combined configuration, or only a corrosion resistant material part is used. Replacing and using can reduce pressure chamber corrosion fatigue to acidic liquids with minimal cost, resulting in extended pump uptime and extended life. Further, a pressure gauge is provided in the pressurizing water chamber side pressurizing pipe line which is shut off by the valve of the fresh water supply system, and the pressure water chamber pressure signal detected by the pressure gauge is fed back to the control unit of the high pressure pump. It is possible to monitor the pressure fluctuations of the pump without direct contact with the system or the pressurized raw material liquid system, and to perform quick automatic control in an emergency.

[Brief description of drawings]

FIG. 1 is a system diagram of a high-pressure liquid continuous pressurizing device to which the present invention is applied.

FIG. 2 is a sectional view of a high pressure pump configuration according to an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part in FIG.

FIG. 4 is a cross-sectional view showing a configuration of a conventional high pressure pump.

FIG. 5 is a cross-sectional view showing the configuration of another conventional high-pressure pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High pressure pump 2 Pump driving hydraulic unit 10 Hydraulic cylinder part 11 Plunger 12 High pressure cylinder part 13 Hydraulic cylinder piston 16 End cover 20,21 Raw material liquid inlet / outlet pipes 22,23,24 Check valve 32 Inner sleeve 33 Balance piston 34 Cap of plunger end 35 Raw material liquid pressurizing chamber 36 Pressurized water chamber 37 Fresh water flow passage 38 Raw material liquid flow passage 39 Fresh water supply pipe 40 Fresh water tank 41 Low pressure fresh water pump 43 Pressure gauge 44 Controller 45 Signal line 46 to 49 O-ring Packing

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F04B 9/113 23/02 E 2125-3H 23/10 2125-3H 49/06 321 Z

Claims (3)

[Claims] 1. In a reciprocating high-pressure pump, an inner sleeve removably mounted on the inner surface of the high-pressure cylinder body, a balance piston provided so as to be slidable in the axial direction close to the inner surface of the end lid of the high-pressure cylinder, and a high-pressure cylinder. A cap that is detachably fixed to the end of the plunger that moves in the cylinder and that has a seal on its outer circumference that slides in contact with the inner peripheral surface of the inner sleeve, is surrounded by the inner sleeve, the balance piston, and the cap, and supplies the external liquid. A pressurized liquid chamber connected to the system, a gap between the end lid and the balance piston,
It is provided so as to communicate between the outer peripheral surface of the inner sleeve and the inner peripheral surface of the high-pressure cylinder body, and from the cap to a partitioned section between the inner peripheral surface of the rear inner sleeve and the outer peripheral surface of the plunger, and is connected to an external fresh water supply system. A high-pressure pump, comprising: 2. The high-pressure pump according to claim 1, wherein the pump cylinder body is made of a pressure-resistant material, and one or some or all of the inner sleeve, the balance piston, the cap, and the end cover are made of a corrosion-resistant material, and another piston is used. A high-pressure pump characterized in that the main body is made of a pressure resistant material and has a combined configuration. 3. The high-pressure pump according to claim 1, wherein a pressure gauge is provided on the pressure pipe side of the pressurized water chamber, which is shut off by the valve of the fresh water supply system, and the pressure signal of the pressurized water chamber detected by the pressure gauge is controlled by the high pressure pump. A high-pressure pump characterized by being configured to feed back to the section.