JPH0457873B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reciprocating pump device including a plurality of pump groups, and more specifically, the present invention relates to a reciprocating pump device including a plurality of pump groups, and more specifically, it improves the durability of a seal that keeps each pump chamber liquid-tight, and improves the discharge. The present invention relates to a reciprocating pump device capable of increasing pressure.

[Conventional technology]

In conventional reciprocating pumps, one reciprocating member contributes only to increasing or decreasing the volume of one pump chamber, and the seals that keep the pump chamber fluid-tight receive pressure from the pump chamber and suction port on both sides, respectively. .

[Problem to be solved by the invention]

Therefore, in order to obtain high pressure, it is necessary to increase the driving force of the reciprocating member, thereby making the reciprocating pump itself larger-scale. Furthermore, in that case, the pressure in the pump chamber increases and the pressure difference on both sides of the seal increases, so the pressure resistance of the seal must be increased.

An object of the present invention is to provide a reciprocating pump device that can reduce the pressure resistance of a seal that partitions a pump chamber and can obtain a high discharge pressure.

[Means to solve the problem]

According to the reciprocating pump device of the present invention, the reciprocating pump device includes a plurality of pump groups. Each pump group is
A plurality of pump chambers arranged in the same straight line, a seal disposed between adjacent pump chambers to maintain liquid tightness between both pump chambers, and a seal corresponding to these pump chambers. A volume changing unit that is provided on a common reciprocating member and increases or decreases the volume of the corresponding pump chamber as the reciprocating member moves back and forth, and gradually decreases the amount of liquid sent toward the final stage, and the suction side and discharge side of each pump chamber. It has a suction valve and a discharge valve provided on each side, and a communication part that communicates between the discharge valve at the front stage and the suction valve at the rear stage of the plurality of pump groups. A pressure regulating valve is disposed on the discharge side of each pump chamber of one of the plurality of pump groups, and the discharge ports of the last stage are communicated with each other. The reciprocating members of the plurality of pump groups are equally divided in phase.

[Effect]

Each pump group repeats the suction stroke and discharge stroke, and is divided into a pump group in the suction stroke and a pump group in the discharge stroke, which act alternately. In the pump group in the suction stroke, each suction valve and discharge valve are in the open state and in the closed state, respectively, and in the pump group in the discharge stroke, each suction valve and the discharge valve are in the closed state and in the open state, respectively.

The communication portion receives liquid from the pump chamber at the front stage of the pump group on the discharge stroke, and the fluid in the communication portion is introduced into the pump chamber at the rear stage of the pump group on the suction stroke. As a result, the reciprocating pump on the rear stage further pressurizes the fluid pressurized by the reciprocating pump on the front stage and discharges it.

〔Example〕

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

FIG. 1 is a configuration diagram of an embodiment applied to a plunger pump. The reciprocating pump device includes two pump groups 10a, 10b, both pump groups 10a, 1
0b is the pump chamber 12a, 12 having the same structure.
b, 12c are arranged side by side on the same straight line,
The plunger member 14 is driven by the crankshaft 16 to reciprocate. Pump chambers 12a, 12
It is preferable that the amount of change in volume of pumps b and 12c is gradually decreased in order to ensure suction of liquid into the pump chamber at the subsequent stage. plunger part 18a,
18b, 18c are pump chambers 12a, 12b, 1
2c, it is provided integrally with the plunger member 14, and its diameter is successively reduced. As the plunger member 14 reciprocates, the pump chambers 12a, 1
2b, 12c are plunger parts 18a, 18b, 1
The volume is increased or decreased by 8c. The suction port 20 communicates with a pump chamber 12a of the reciprocating pump at the forefront, and the pressure chamber 22 is disposed adjacent to the pump chamber 12a in the axial direction of the plunger member 14 and surrounds the plunger portion 18a. The seal packing 24 maintains liquid tightness on the base end side of the pressure chamber 22 against sliding of the plunger portion 18a, and seals 26a, 26b, 2
6c is disposed between the pressure chamber 22 and the pump chamber 12a, between the pump chambers 12a and 12b, and between the pump chambers 12b and 12c, respectively, and is designed to prevent sliding of the plunger portions 18a, 18b, and 18c. Maintain liquid tightness on both sides. The oil seal 27 is fitted into a penetrating portion of the plunger member 14 of a crankcase (not shown), and prevents lubricating oil from leaking from inside the crankcase. Pump chambers 12a, 12b, 1
A suction valve 28 is provided on the suction side and the discharge side of 2c, respectively.
a, 28b, 28c and discharge valves 30a, 30b,
30c is provided. Suction valves 28a, 28b, 2
8c and the discharge valves 30a, 30b, 30c are check valves, and are opened and closed in relation to changes in the volumes of the pump chambers 12a, 12b, 12c as the plunger member 14 reciprocates.

The upstream side of the suction valve 28a of the pump groups 10a, 10b communicates with the suction port 20. The communication portion 32a communicates with the downstream side of the discharge valve 30a and the upstream side of the suction valve 28b of the pump group 10a, and the downstream side of the discharge valve 30a and the upstream side of the suction valve 28b of the pump group 10b. The communication portion 32b communicates with the downstream side of the discharge valve 30b and the upstream side of the suction valve 28c of the pump group 10a, and the downstream side of the discharge valve 30b and the upstream side of the suction valve 28c of the pump group 10b. The discharge port 34 communicates with the downstream side of the discharge valves 30c of the pump groups 10a and 10b. The pressure regulating valves 36a, 36b and 36c are
They communicate with the communicating portions 32a, 32b and the discharge 34, respectively, and limit the maximum pressure at those locations.

Plunger member 14 of pump group 10a, 10b
The phases are shifted by 180 degrees with respect to the angle of the crankshaft 16, and when one pump group is on the suction stroke (rightward movement of the plunger member 14 in FIG. 1), the other pump group is on the discharge stroke (movement of the plunger member 14 to the right in FIG. 1). In FIG. 1, the plunger member 14 is moved to the left.

The operation of the embodiment shown in FIG. 1 will be explained.

During the period in which the pump group 10a is in the suction stroke, the pump group 10b is in the discharge stroke, and the pump group 10a is in the discharge stroke.
In this case, the suction valves 28a, 28b, 28c and the discharge valves 30a, 30b, 30c are in the open state and the closed state, respectively, and in the pump group 10b, the suction valve 28
a, 28b, 28c and discharge valves 30a, 30b,
30c are in a closed state and an open state, respectively. The communication parts 32a and 32b are connected to the pump chamber 1 of the pump group 10b.
2a and 12b, the communication portion 32
The liquids a and 32b are in the pump chamber 1 of the pump group 10a.
2b and 12c.

Furthermore, during the period in which the pump group 10a is in the discharge stroke, the pump group 10b is in the suction stroke, and in the pump group 10a, the suction valves 28a, 28b, 28c and the discharge valves 30a, 30b, 30c are in the closed state and the open state, respectively. In the pump group 10b, the suction valves 28a, 28b, 28c and the discharge valves 30a, 30
b and 30c are in an open state and a closed state, respectively.
The communication parts 32a and 32b receive liquid from the pump chambers 12a and 12b of the pump group 10a, and the communication parts 32
The liquids a and 32b are in the pump chamber 1 of the pump group 10b.
2b and 12c.

Note that the excess amount of liquid supplied from the pump chambers 12a, 12b in the previous stage to the communication portions 32a, 32b is discharged from the pressure regulating valves 36a, 36b.

As a result, the pump chambers 12b, 12c on the downstream side
Since the liquid pressurized by the pump chambers 12a and 12b on the previous stage side is further pressurized and discharged, it is possible to take out liquid at various pressures from each stage, and the discharge pressure of the pump chamber 12c on the last stage can be taken out. The pressure at the outlet 34 becomes very high.

The seals 26a, 26b, 26c that keep the pump chambers 12a, 12b, 12c liquid-tight receive the pressure of the pump chambers adjacent in the axial direction of the plunger member 14 from both sides, and only a differential pressure is applied thereto.

FIG. 2 is a diagram showing a modification of FIG. 1. The pump group 10b also has the same configuration as the pump group 10a, so illustration is omitted. In FIG. 1, the plunger parts 18a, 18b, 18c are formed integrally with the plunger member 14, whereas in FIG. There is. That is, the plunger member 14 has a shaft portion 38, the plunger portions 18a, 18b, and 18c are fitted in this order, and the nut 40 is screwed onto the tip of the shaft portion 38 to prevent the plunger portions 18a, 18b, and 18c from coming off. is prevented. In the example of FIG. 2, the plunger portion 18
a, 18b, 18c can be easily processed, plunger parts 18a, 18b, 18c can be replaced, and the material of plunger parts 18a, 18b, 18c can be changed depending on the liquid. .

FIG. 3 is a configuration diagram of an embodiment applied to a piston pump. Explanation of the parts common to FIG. 1 will be omitted, and only the differences will be explained. The cylinder pipes 42a, 42b, 42c are each in the pump chamber 1.
2a, 12b, and 12c, and the piston member 44 has piston portions 45 whose diameters are reduced in order corresponding to the pump chambers 12a, 12b, and 12c.
Seal packings 46a, 46b, 46c integrally having parts a, 45b, 45c are fitted around the piston parts 45a, 45b, 45c, respectively,
As the piston member 44 reciprocates, the cylinder pipes 42a, 42b, and 42c slide. The piston members 44 of the pump groups 10a, 10b are arranged in phase at the angle of the crankshaft 16, as in the case of the plunger members 14 of the pump groups 10a, 10b in FIG.
They are shifted by 180 degrees, and one pump group is on the suction stroke (movement of the piston member 44 to the right in FIG. 3).
, the other pump group is on the discharge stroke (leftward movement of the piston member 44 in FIG. 3). Pump chamber 1 of pump groups 10a and 10b
2a, 12b, 12c are communication parts 32a, 32b
are connected in series, and the liquid pressurized in the pump chamber at the front stage is further pressurized in the pump chamber at the rear stage, and high-pressure liquid is discharged from the discharge port 34.

FIG. 4 is a diagram showing a modification of FIG. 3. The pump group 10b also has the same configuration as the pump group 10a, so illustration is omitted. In FIG. 3, the piston parts 45a, 45b, 45c are the piston member 44.
In contrast, in FIG. 4, the piston parts 45a, 45b, and 45c are formed separately from the piston member 44. That is, the piston member 44 has a shaft portion 48 and the piston portion 45
a, 45b, and 45c are fitted in order, and the nut 5
0 is screwed onto the tip of the shaft portion 48 to form the piston portion 45.
This prevents a, 45b, and 45c from coming off. Fourth
In the illustrated example, piston parts 45a, 45b, 45c
The material of the piston parts 45a, 45a and 45a can be made shorter and smaller, and the material can be easily obtained and processed.
45b, 45c can be replaced, and the material of the piston parts 45a, 45b, 45c can be changed depending on the application.

〔Effect of the invention〕

As described above, according to the present invention, the plurality of reciprocating pumps in each pump group are driven by a common reciprocating member, and the phases of the reciprocating members in the plurality of pump groups are equally divided. , the communication part is
The reciprocating pumps of each pump group are connected in series, and the liquid discharged from the pump chamber of the pump group in the pressurizing stroke is guided to the pump chamber of the pump group in the suction stroke. As a result,
Since the fluid is pressurized in stages by the reciprocating pump, fluid at various pressures can be extracted from the reciprocating pumps at each stage, and fluid at a very high pressure can be obtained from the reciprocating pump at the last stage.

Further, according to the present invention, the seal is disposed between adjacent pump chambers in each pump group and has the role of maintaining liquid tightness between both pump chambers, so that the pressure difference on both sides of the seal is reduced. Despite the magnitude of the fluid pressure finally generated by the reciprocating pump device according to the present invention, it is a small value, making it possible to reduce the pressure resistance strength of the seal and increase the durability of the seal.

[Brief explanation of drawings]

The drawings relate to embodiments of the present invention; FIG. 1 is a configuration diagram of an embodiment applied to a plunger pump, and FIG.
3 is a diagram showing a modification of FIG. 1, FIG. 3 is a configuration diagram of an embodiment applied to a piston pump, and FIG. 4 is a diagram showing a modification of FIG. 3. 10a, 10b...pump group, 12a, 12b,
12c... Pump chamber, 14... Plunger member (reciprocating member), 18a, 18b, 18c... Plunger part (volume changing part), 26a, 26b, 26c... Seal, 28a, 28b, 28c... Suction valve, 30
a, 30b, 30c...discharge valve, 32a, 32b...
Communication portion, 44... Piston member (reciprocating member), 4
5a, 45b, 45c...Piston section (volume changing section).

Claims (1)

[Claims] 1. Reciprocating pump device: multiple pump groups 10a, 10
a plurality of pump chambers 12a, 12b, 1 in which each pump group is arranged in line on the same straight line.
2c, and a seal 26a disposed between the adjacent pump chambers to maintain liquid tightness between the two pump chambers.
26b, 26c, and volume changing portions 18a, 18b, 18c, which are provided on the common reciprocating member 14, 44 corresponding to these pump chambers and increase or decrease the volume of the corresponding pump chamber as the reciprocating member reciprocates. 45
a, 45b, 45c, and each pump chamber 12a, 12
suction valves 28a, 28b, 28c and discharge valve 3 provided on the suction side and the discharge side of b, 12c, respectively
0a, 30b, 30c, and communication portions 32a, 32b that communicate the front-stage discharge valve and the rear-stage suction valve of the plurality of pump groups, and the discharge port 34 of the last stage that communicates with each other. Each pump chamber 12a, 12b of one of the pump groups,
Pressure regulating valves 36a, 36b, 36 are provided on the discharge side of 12c.
c is arranged, and the reciprocating members of the plurality of pump groups are equally divided in phase. 2. The reciprocating pump device according to claim 1, wherein the discharge amount of the pump chambers 12a, 12b, and 12c decreases sequentially from the front-stage pump chamber to the rear-stage pump chamber. 3. The reciprocating pump device according to claim 1 or 2, wherein the volume changing portions 18a, 18b, and 18c are plungers. 4. The reciprocating pump device according to claim 1 or 2, wherein the volume changing portions 18a, 18b, and 18c are pistons.