JPS5919830Y2 - Cylinder for reciprocating pump - Google Patents

Description

[Detailed description of the invention] The present invention is a cylinder for a reciprocating pump. Specifically, the cylinder is installed between the tip of the crankcase and a head member having a suction passage and a discharge passage, and a piston member is freely reciprocated in the cylinder chamber. The present invention relates to a cylinder for a reciprocating pump that supports the cylinder and has a valve device attached to the head.

Conventionally, a cylinder in a reciprocating pump is provided with a cylinder chamber for freely supporting a piston member in reciprocating motion, a suction passage and a discharge passage, and a cylinder is provided between the suction passage and the discharge passage at a center portion and an outer peripheral portion. It has been proposed that a valve device supporting a suction valve, a discharge valve, and two valve springs is attached to a single valve seat having a suction hole and a discharge hole.

However, according to this conventional device, the structure of the cylinder is very complicated, and there are problems in that not only is it difficult to assemble the valve device into the cylinder accurately, but also it is difficult to remove it from the cylinder.

Therefore, the conventional cylinder described above is divided into a straight cylinder having a cylinder chamber and a head member having a suction passage and a discharge passage, and the cylinder is installed between the tip of the crankcase and the head member. , an outer peripheral edge of a valve seat having a suction hole and a discharge hole in a center portion and an outer peripheral portion is sandwiched between the cylinder and the head member, and the two valves are further sandwiched between the cylinder and the head member. We have previously developed a device that solves the above-mentioned conventional problems by supporting a spring.

However, in this case, the valve seat, which is attached to the head-side open end of the cylinder formed in a straight cylindrical shape, has a suction hole and a discharge hole in its center and outer circumference, and the valve seat has a large diameter. Therefore, the valve seat could not be formed from a metal plate with a thickness that could be formed by press molding.

Therefore, it was necessary to form the valve seat by cutting to increase its wall thickness so that it would not be deformed or damaged by the impact load when the suction valve and discharge valve are closed.

Therefore, there is a problem in that the cost of the valve device and, by extension, the pump as a whole is high.

The present invention is such that the valve seat is attached between the tip of the crankcase and the head member as described above, and the valve seat can be formed from a metal plate having a thickness that can be formed by press molding. The valve seat can be prevented from being deformed or damaged by impact loads, and the valve seat can be firmly fixed, and is provided with a cylinder chamber, with one end of the cylinder chamber open. and a cylindrical cylinder body made of synthetic resin with the other end closed by a closing wall;
When the main body is installed, the valve seat is fixed to the closing wall of the main body by being embedded in the metal plate, and the valve seat is attached to the membrane wall facing inside the closing wall and to the bottom wall. The cylinder wall is continuous and has an opening at one end, and a peripheral wall extends radially outward from the opening edge of the cylinder wall and contacts the outside of the closing wall, and has a suction hole in one of the bottom wall and the peripheral wall. A discharge hole is provided on the other side, and a first through hole corresponding to one of the suction hole and the discharge hole formed on the bottom wall of the valve seat is provided in the center of the closing wall of the cylinder body. A second through hole corresponding to the other of the suction hole and the discharge hole formed in the peripheral wall of the valve seat is provided on the outer periphery, while a cylindrical wall of the valve seat embedded within the thickness of the closing wall has a radius. The present invention is characterized in that two or more flow holes are provided that penetrate in the direction and allow the flow of the hollow resin material when the closing wall is hollow-shaped.

Embodiments of the cylinder of the present invention will be described below based on the drawings.

The illustrated cylinder is installed between the tip of a crankcase 20 and a head member 21 having a suction passage 21a and a discharge passage 21b, and supports a piston member 22 in the cylinder chamber 1b so as to freely reciprocate. And,
A hard synthetic resin with one end open and the other end closed with a closing wall 1a, with one first through hole 11 in the center of the closing wall 1a and a plurality of second through holes 12 in the outer periphery. A cylinder body 1 is formed by molding, and a seal member 2, a seal receiver 3 that supports the seal member 2, and the seal member 2 are inserted into the cylinder chamber 1b of the cylinder body 1 through a seal lower seat 4. Spring 5 pressing against seal receiver 3
While supporting the cylinder body 1, a guide tube 6 extending outward from around the first through hole 11 of the closing wall 1a is integrally formed with the same material as the body 1 when the cylinder body 1 is molded. At the same time, the valve seat 71 of the valve device 7 is fixed to the closing wall 1a by embedding.

The valve seat 71 is formed by press molding a hard metal plate such as stainless steel having a thickness that allows press molding. C, the four people 71a and the bottom wall 71C
A cylindrical wall 71 d that is continuous with the cylindrical wall 71 d and has an open end, and the cylindrical wall 71 d
and a circumferential wall 71b extending radially outward from the opening edge of the closing wall 1a and facing the outside of the closing wall 1a, and the bottom wall 71
C, a suction hole 72 corresponding to the first through hole 11,
Further, a plurality of discharge holes 73 corresponding to the second through holes 12 are provided in the peripheral wall 71 b, and the cylindrical wall 71 d
is provided with two or more communication holes 74 that penetrate in the radial direction and allow the flow of the resin material when the closing wall 1a is molded, and when the cylinder body 1 is molded, the cylindrical wall 71d
is fixed by embedding within the thickness of the closing wall 1a and between the front l and second through hole 11.12 of the closing wall 1a, and the cylinder is inserted into the communication hole 74 provided in the cylindrical wall 71d. The main body 1 is filled with the synthetic resin material, and the bottom wall 71C is placed inside the closing wall 1a, and the peripheral wall 71b is placed outside the closing wall 1a.

The valve device 7 includes a valve seat 71 having the suction hole 72 and the discharge hole 73, and a suction valve 7 that opens and closes the suction hole 72.
5, a discharge valve 76 that opens and closes the discharge hole 73, and a first valve that presses the valve seat 71 between the suction valve 75 and the discharge valve 76.
and the second valve springs 77 and 78, and the suction valve 75
is disposed on the outlet side of the suction hole 72, that is, inside the cylinder chamber 1b, and the discharge valve 76 is disposed on the outlet side of the discharge hole 73, that is, inside the discharge passage 21b, so that these suction valves 75 and The valve 76 is connected to the first and second valve springs 77.
, 78 to press against the valve seat 71.

The cylinder chamber 1 in which the piston member 22 reciprocates
A ring-shaped spring receiver 8 that allows the passage of the piston member 22 is provided in the middle of b, and the first valve spring 77 that presses the suction valve 75 and the seal member 2 are attached to this spring receiver 8. The first valve spring 77 is formed into a conical shape with a larger diameter on the tip end side of the piston member 22, and the first valve spring 77 supports the pressing spring 5.
The piston member 22 is accommodated in the cylinder chamber 1b, and the first valve spring 77 and the spring receiver 8 are accommodated in the cylinder chamber 1b. The terminal end is arranged near the suction valve 75.

Further, the second valve spring 78 is supported on the surface of the discharge passage 21b of the head member 21.

Although the cylinder body 1 is made of ponyphenylene sulfide resin, it may be made of other hard synthetic resins.

The cylinder of the present invention is constructed as described above. Next, an example in which this cylinder is incorporated into a reciprocating pump will be described.

The reciprocating pump shown in FIG. 3 is a triple reciprocating pump in which three piston members are arranged in parallel.
Basically, a drive shaft 24 is rotatably supported in the crankcase 20 via bearings 23 and 23.
At the same time, three cam bodies 25 having a cylindrical shape with an eccentric shaft hole 25a are attached, and the three cylinders are attached to the crankcase 20, and the cam bodies 25 are attached to the cylinder chamber 1b of each cylinder. Three piston members 22 connected via each rod 26 are supported for free reciprocation,
Then, a discharge valve 76 and a second valve spring 78 that presses the discharge valve 76 against the valve seat 71 are inserted into the guide cylinder 6, and the discharge valve 76 is pressed against the valve seat 71 by the second valve spring 78.
A head member having a suction passage 21a and a discharge passage 21b at the head side tip of the cylinder, and three through holes 21C between the suction passage 21a and the discharge passage 21b. 21, the tip of the guide tube 6 is inserted into the through hole 21C, and the suction hole 72 is communicated with the suction passage 21a,
The second valve spring 78 is supported on the surface b of the discharge passage 21.

The cylinder is inserted between the crankcase 20 and the head member 21 and fixed by screwing a nut 28 onto the tip of a mounting bolt 27 attached to the tip of the crankcase 20. be.

Then, due to the rotation of the drive shaft 24, the piston member 22
When the cylinder moves back and forth, the discharge valve 76 closes and the suction valve 75 opens, and the liquid stored in the tank or the like flows from the suction passage 21a through the suction passage 21a and the suction hole 72 into the cylinder. When the liquid is sucked into the chamber 1b and the piston member 22 moves forward, the suction valve 75 closes and the discharge valve 76 opens, and the liquid in the cylinder chamber 1b is pressurized and discharged from the discharge hole 73 into the discharge passage 21b. It will be done.

Due to the reciprocating movement of the piston member 22, the suction valve 7 is
5 closes, an impact load acts on the suction hole 72 provided in the bottom wall 71C of the valve seat, and the protruding passage 21
When the discharge valve 76 closes due to the hydraulic pressure of the valve seat 71 and the repulsive force of the second valve spring 78, an impact load is applied to the discharge hole 73 provided in the peripheral wall 71b of the valve seat 71. The bottom wall 71C faces the inside of the closing wall 1a, and the bottom wall 7
1 C, a cylinder wall 71 d that is open at one end, and the cylinder wall 7
The closing wall 1a extends radially outward from the opening edge of 1d.
In order to fix the cylindrical wall 71d of the valve seat 71, which is separated from the peripheral wall 71b facing the outside of the valve seat 71, into the closing wall 1a of the cylinder body by embedding, the valve seat 71 is made of a thick metal plate that can be press-formed. Even if it is formed of a plate, the suction (672
It is possible to reliably prevent the deformation and damage of the discharge hole 73 portion and the discharge hole 73 portion due to the impact load, and furthermore, by embedding the cylinder wall 71d in the closing wall 1a, the cylinder wall 71d
By filling the synthetic resin material of the cylinder body 1 into the communication hole 74 provided in the cylinder body 1, the cylinder wall 71d can be fixed extremely firmly. Even if a large impact load is applied, the valve seat 71 will not fall off the closing wall 1a.

In the above description, the suction hole 72 was provided in the bottom wall 71C of the seat, and the discharge hole 73 was provided in the peripheral wall 71b, but the opposite may be used.

In this case, the bottom wall 71C is placed outside the closing wall 1a, and the peripheral wall 71b is placed inside the closing wall 1a.

As described above, the present invention includes a cylindrical cylinder body made of synthetic resin, which is provided with a cylinder chamber, one end of which is open, and the other end of which is closed with a closing wall, and a cylinder body that is made of a metal plate. It consists of a valve seat that is fixed by embedding in the closing wall of the main body when it is in the round shape, and the valve seat is connected to a bottom wall that is in contact with the inside of the closing wall, and a cylindrical wall that is continuous with the bottom wall and has an open end. a peripheral wall extending radially outward from the opening edge of the cylindrical wall and facing the outside of the closing wall, and providing a suction hole in one of the bottom wall and the peripheral wall and a discharge hole in the other, A first through hole corresponding to one of the suction hole and the discharge hole formed in the bottom wall of the valve seat is formed in the center of the closing wall of the cylinder body, and a first through hole is formed in the peripheral wall of the valve seat in the outer peripheral part. While providing a second through hole corresponding to the other of the suction hole and the discharge hole,
Two or more flow holes are provided in the cylindrical wall of the valve seat embedded in the thickness of the closing wall, penetrating in the radial direction and allowing flow of the resin material when the closing wall is hollow, The valve seat,
Even if the valve seat is formed of a metal plate having a thickness that can be press-formed, it is possible to reliably prevent the valve seat from being deformed or damaged by the impact load when the suction valve and discharge valve close. By embedding, the synthetic resin material of the cylinder body can be filled into the communication holes provided in the cylinder wall, and the cylinder wall can be extremely firmly fixed. Even when subjected to impact loads,
This makes it possible to reliably prevent the valve seat from falling off.

Therefore, according to the present invention, the valve seat having suction and discharge holes in the center and the outer periphery can be mass-produced using a press bottom mold, thereby reducing the cost of the valve device and the pump as a whole. be.

[Brief explanation of the drawing]

FIG. 1 is an enlarged vertical sectional view showing an embodiment of the cylinder of the present invention;
FIG. 2 is a plan view taken along the line II--II of FIG. 1. FIG. 3 is an explanatory diagram showing the state in which the cylinder of the present invention is used. 1...Cylinder body, 1a...Closing wall, 1b...
Cylinder chamber, 11.12... Through hole, 71... Valve seat, 71 b... Peripheral wall, 71 C... Bottom wall, 71 d
... cylinder wall, 72 ... suction hole, 73 ... discharge hole, 7
4... Distribution hole, 20... Crank case, 21...
・Head member, 21 a... Suction passage, 21 b...
-Discharge passage, 22... piston member.

Claims (1)

[Scope of utility model registration request] A cylinder for a reciprocating pump, which is installed between the tip of a crankcase and a head member having a fitting passage and a discharge passage, and supports a piston member in the cylinder chamber so as to freely reciprocate, the cylinder having a cylinder chamber. , a cylindrical cylinder body made of synthetic resin with one end of the cylinder chamber open and the other end closed with a closing wall, and a cylinder made of a metal plate and embedded in the closing wall of the body when the body is hollow-shaped. a bottom wall that abuts the valve seat against the inside of the closing wall;
The cylinder wall is continuous with the bottom wall and has an open end, and the peripheral wall extends radially outward from the opening edge of the cylinder wall and contacts the outside of the closing wall, and one of the bottom wall and the peripheral wall has a A suction hole is provided on the other side, and a discharge hole is provided on the other side, and a first through hole is provided in the center of the closing wall of the cylinder body, corresponding to one of the suction hole and the discharge hole formed on the bottom wall of the valve seat. ,
Further, a second through hole corresponding to the other hole of the suction hole and the discharge hole formed in the peripheral wall of the valve seat is provided on the outer peripheral portion, while a cylindrical wall of the valve seat embedded in the thickness of the closing wall, A cylinder for a reciprocating pump, characterized in that it is provided with two or more flow holes that penetrate in the radial direction and allow the flow of resin material when the closing wall is closed.