JPH0648154Y2 - High pressure pump plunger assembly structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to the material and shape of the plunger of a high-pressure pump and its assembly structure.

(B) Conventional Technology It has been conventionally known that a small pump for physics and chemistry uses an O-ring to fix a portion of a glass bottle tank. For example, it is as in Japanese Utility Model Laid-Open No. 59-97274.

For the configuration of the plunger pump, see
-127802 gazette, real development Sho 51-80703 gazette, real development Sho 51-
The technique described in Japanese Patent No. 121802 is publicly known.

(C) Problems to be solved by the invention The plunger of the conventional power sprayer for agriculture is made of metal such as aluminum and has a structure in which a connecting rod is attached to the rear part and supported at the front end of the crank.

In addition, recently, there is also a structure that is made of a cylindrical ceramic with an emphasis on heat resistance, strength, and lightness, and has a structure in which a metal shaft is inserted inside and it is fastened with a bolt from the front end. became.

However, these conventional structures have the following drawbacks or problems.

That is, in the case of metal and having a connecting rod in the rear part, the number of parts was large, and the heat resistance, strength and lightness were insufficient.

In addition, a hollow ceramic product with a shaft through the inside is not sufficient in terms of strength such as damage due to the thin wall thickness of the ceramic part. It couldn't be done easily.

(D) Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows.

The plunger 15 that slides inside the V-packing 22 in the cylinder case 4 is made of a solid ceramic shaft, and the guide metal 18 that slides back and forth in the cylinder 1a of the crankcase 1
In the structure in which the plunger 15 and the plunger 15 are integrated with each other, a ring groove 15a is provided on the outer periphery of the rear portion of the plunger 15, an O ring 16 is fitted in the ring groove 15a, and the O ring 16 is opened in the guide metal 18. The screw 15 which is screwed into the screw hole 18a is loosely fitted around the outer periphery of the plunger 15, and the O-ring 16 is pressed by the screw 17 to guide the plunger 15 and the guide. Metal 18 is integrated.

(E) Embodiment The object of the present invention is as described above, and the structure of the present invention will be described based on the structure of the embodiment shown in the accompanying drawings.

First, the overall structure of a high-pressure pump equipped with the plunger assembly structure of the present invention will be described with reference to FIG.

The high-pressure pump A has a crankcase 1, a cylinder case 4,
And a crank device covered with the lid 6, a plunger device, and a valve device.

First, the crank device will be described.

The rear surface of the crankcase 1 is sealed with a lid body 6,
A lubricating oil detecting window 7 is provided at the center of the lid 6, and a drain bolt 8 is provided at the lower portion. The crankcase 1 and the cylinder case 4 are fixed to each other so that the rear surface of the cylinder case 4 is located on the front surface of the crankcase 1. Reference numeral 9 is a water stop ring for preventing pressure water leakage.

Further, the front portion of the crankcase 1 is integrally configured so as to form a cylindrical body 1a, the crankshaft 5 is positioned in the left-right direction, and the base portion of the connecting rod 2 is fitted to the crankshaft 5.

A valve device is arranged in the front part of the cylinder case 4, a suction port 12 is provided in the upper rear part, and a water stop port 13 is provided in the lower part. A pressure chamber is provided outside the water stop 13.

Next, the plunger device will be described.

Plunger devices are installed in three horizontal left and right positions,
One set will be described.

The plunger 15 is disposed in the cylinder case 4 from the inside of the cylinder 1a at the front of the crankcase 1, and the rear part of the plunger 15 is attached to the front end of the guide metal 18. 19
Is an oil seal that prevents the lubricating oil in the crankcase 1 from leaking forward.

21 is a seal that prevents water leakage from the valve side, and 22
Is a V packing for preventing water leakage from the cylinder head, and 23 is a spring for urging the V packing 22.

In the plunger 15 configured as described above, the rear guide metal 18 is pivotally attached to the front end of the connecting rod 2 by the pin 3, and slides back and forth on the inner surface of the cylinder 1a and the inside of the cylinder case 4 as the crank moves.

Next, the valve device will be described.

The valve device is composed of a water absorption valve 10 and a water discharge valve 11, and can be attached / detached from the water absorption side. The structure of the valve device is such that the cylindrical body 26 is provided below the plug 14.
Is fixed by a ring, the water absorption valve 10 is provided inside the cylindrical body 26, and several holes 28 communicating with the inside of the cylinder are provided on the side surface.

The cylindrical body 30 of the water discharge valve 11 is connected to the lower part of the cylindrical body 26, and the cylindrical body 30 and the water discharge valve 11 constitute a valve device. 32 is a spout ring. Similar to the plunger device, three sets of water suction valves and water discharge valves are provided.

Therefore, the crankshaft 5 in the high-pressure pump A is driven by the engine or the electric motor provided outside the high-pressure pump A to drive the plunger 15 via the connecting rod 2.
Slide. Further, due to the pulling stroke of the plunger 15, water that has passed through the passage 4a in the cylinder case 4 from the suction port 12 passes through the hole 28, pushes the water absorption valve 10 open and is sucked, and reaches the inside of the valve device. Further, the water that has entered the valve device closes the water absorption valve 10 by the pushing stroke of the plunger 15, pushes the water discharge valve 11 open, is sent from the water discharge port 13 to the pressure chamber, is compressed in the pressure chamber, and then discharges water. Is done.

In the high-pressure pump A having such a structure, the essential part of the present invention is the shape and material of the plunger and the assembling structure thereof, as shown in FIGS.

The plunger assembly structure of the present invention comprises a plunger 15, an O-ring 16, a set screw 17 and a guide metal 18.

Plunger 15 is composed entirely of solid ceramic shaft,
A ring groove 15a is provided on the outer peripheral surface of the rear portion.

The O-ring 16 consists of a metal ring,
Plunger 1 by fitting in ring groove 15a of 15
This is to prevent the retainer of 5 from coming off. It is also possible to use a C ring that serves as a spring without using the O ring 16.

The set screw 17 is made of a cylindrical metal body having a screw groove formed on the outer peripheral surface of the rear portion thereof, and is configured so that it can be fitted into the outer periphery of the plunger 15 with almost no gap.

The guide metal 18 is made of metal, has a screw hole 18a for the plunger 15 at the front end, and has a thread groove corresponding to the thread groove of the set screw 17 on the inner peripheral surface of the hole 18a. It is carved. Furthermore, the insertion port 18 at the front end of the connecting rod 2 is provided at the rear.
b is provided, guide metal 18 and connecting rod 2 on the left and right
And a pin 18c into which the pin 3 for locking the front end is inserted.

Therefore, the O-ring 16 is heat-expanded and fitted into the ring groove 15a of the plunger 15, and the O-ring 16 is cooled and fitted firmly into the ring groove 15a of the plunger 15, and then the O-ring 1
The rear end of the set screw 17 is fastened to the front end of the guide metal 18 by sandwiching 6 and the plunger 15 is assembled to the guide metal 18.

In the present invention, the fact that the plunger 15 is composed of a solid ceramic shaft emphasizes heat resistance, strength, and light weight. It is possible to prevent the ceramic from being damaged due to its thinness.

Also, since the number of parts is only one plunger 15, the O-ring 16, the set screw 17 and the guide metal 18, the assembly can be done easily and the plunger device can be loosened when the high pressure pump A is used. The distortion could be reduced.

(F) Effects of the invention The following effects can be produced by configuring the invention as described above.

First, the O-ring 16 fitted around the outer periphery of the plunger 15.
Since the set screw 17 for pressing and pinching is screwed into the screw hole 18a formed in the guide metal 18, the outer diameter of the set screw 17 is smaller than the outer diameter of the guide metal 18. It can be configured.

Therefore, the set screw 17 can have a small diameter so as not to come into contact with the inner circumference of the cylindrical body 1a, and both the set screw 17 and the guide metal 18 slide in the state of being in contact with the cylindrical body 1a. It is no longer necessary to improve the accuracy of the set screw 17. Therefore, the precision of the set screw 17 may be low, and the cost can be reduced.

Secondly, the plunger 15 made of ceramic is
It is difficult to connect with the metal guide metal 18. It is difficult to screw the threaded portion on the ceramic side, and if possible, the cost is high.

According to the present invention, the ceramic plunger 15 and the metal guide metal 18 are fixed to each other by a set screw 17 and an O-ring 16 so that the number of parts is small and the structure is simple and reliable. Further, the ceramic plunger can be easily attached and detached.

Thirdly, by constructing the plunger with a solid ceramic shaft, it is possible to improve the heat resistance, which was a problem with conventional plungers, and also improve the strength and further reduce the weight. I was able to improve it.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a high-pressure pump, FIG. 2 is a side sectional view showing an assembled state of a plunger, FIG. 3 is a rear view of a guide metal, and FIG. 4 is a side view of a plunger. A: High pressure pump 2 ... Connecting rod 15 ... Plunger 16 ... O-ring 16a ... Ring groove 17 ... Set screw 18 ... Guide metal 18a ... Screw hole

Front page continuation (72) Creator Toru Nomura 6-6 Nishiwaka-cho, Mishima City, Shizuoka Prefecture, New Delta Industrial Co., Ltd. (56) References (JP, U) Actually open 49-127802 (JP, U) Actually open 51-121802 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A plunger 15 which slides inside a V packing 22 in a cylinder case 4 is constituted by a solid ceramic shaft, and a guide metal 18 which slides back and forth in a cylinder 1a of a crankcase 1 and the above. In the configuration in which the plunger 15 is integrated, a ring groove 15a is provided on the outer periphery of the rear portion of the plunger 15, an O-ring 16 is fitted in the ring groove 15a, and the O-ring 16 is screwed into the guide metal 18. Inserted into the mounting hole 18a portion, further, a set screw 17 screwed into the screw hole 18a is loosely fitted around the outer periphery of the plunger 15, and the O-ring 16 is pressed by the set screw 17, and the plunger 15 and the guide metal 18 Plunger assembly structure of high-pressure pump, which is characterized by integrating