JPH06213162A - Abrasion preventing device for reciprocating pump - Google Patents

Abstract

PURPOSE:To prevent abrasion and improve durability by seating a one-way valve provided on the intake passage and the delivery passage of a pump chamber on a valve seat made of high-tenacity soft synthetic resin with a spring in a plunger pump. CONSTITUTION:A pump case 12 is supported on a bulge section formed at the center of a communicating pipe member 17, and the communicating pipe member 17 is formed with an inflow port 21 at one end and a delivery port 22 at the other end. An intake passage 23 is fitted to the inflow port 21, and a delivery passage member 24 is fitted to the delivery port 21 via a one-way valve 30 respectively. A valve seat member 38 made of soft synthetic resin is screwed into a cylindrical valve case 31, and a steel valve element 33 is excited by a spring 34 and seated on a valve seat 37 to constitute the one-way valve 30. Polypropylene is used for the soft synthetic resin, and the valve element 33 may be made of synthetic rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a reciprocating pump such as a plunger pump and a diaphragm pump, and more particularly to a wear preventing device for a valve member which is easily worn when a liquid containing hard fine powder such as ceramics is fed. It is a thing.

[0002]

2. Description of the Related Art Generally, a reciprocating pump expands and contracts in a pump chamber by a reciprocating member such as a piston and an elastic film, and a one-way valve is provided in a suction passage and a discharge passage which communicate with the pump chamber. On the other hand, many of these one-way valves have a valve body made of a hard material such as hardened steel or ceramic and a relatively easy-to-use material for receiving it, for example, a valve made of a copper alloy, in order to improve abrasion resistance. A seat, and the valve element is biased by a spring toward the valve seat.

[0003]

However, no matter how hard the valve body or valve seat of the one-way valve is made, it will not be treated as abrasive dust of diamond or ceramic, or water containing slaked lime used for wastewater treatment. It is known that when a liquid containing such hard fine powder is fed, the seating surfaces of the valve body and the valve seat are worn out in an extremely short time.

[0004]

SUMMARY OF THE INVENTION As described above, the object of the present invention is to obtain a reciprocating pump having a one-way valve suitable for use in a place where the wear is severe. A reciprocating pump having a suction passage connected to a pump chamber via a one-way valve allowing the flow into the pump chamber and a discharge passage connected to the pump chamber via a one-way valve allowing the flow to the pump chamber. It is characterized in that the one-way valve is composed of a valve body which is seated on a valve seat by a spring, and the valve seat is formed of a high toughness soft synthetic resin.

[0005]

When the volume in the pump chamber is expanded, the one-way valve of the suction passage is opened, and when it is contracted, the one-way valve of the discharge passage is opened. As a result, the liquid containing the hard fine powder is discharged from the suction passage through the pump chamber. It flows toward the discharge passage. Here, when both one-way valves are closed, hard fine particles contained in the fluid interposed between the valve body and the valve seat may be caught between the valve body and the valve seat, but the valve seat is composed. Since it is made of resin, when a valve element is seated, a hard foreign material elastically deforms the valve seat and slips into it, causing friction between the foreign material and the valve body or valve seat. Absent.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, 10 is a diaphragm pump which is a reciprocating pump. The pump 10 has a diaphragm 1 between a drive case 11 and a pump case 12 that closes one end thereof.
3 is clamped at its peripheral edge. The diaphragm 13 has a through hole at its center, and the nut 1
The drive rod 16 is screwed on via 4 and the washer 15. Thus, the pump chamber 20 is formed between the lower part of the diaphragm 13 and the pump case 12.

The pump case 12 is supported by an enlarged portion formed at the center of the communicating pipe member 17. The communication pipe member 17 is formed in a substantially cylindrical shape, and has an inflow port 21 at one end thereof.
And a discharge port 22 is opened at the other end. The inlet 21
A suction passage member 23 and a connection pipe 23 forming a discharge passage are screwed into the discharge port 22 and the discharge port 22.
A one-way valve 3 is provided between the pump case 12 and the pump case 12.
0 is sandwiched.

FIG. 2 shows a one-way valve 30, which is shown in FIG.
Shows a conventional example, and (b) shows the product of the present invention.
That is, in the one-way valve 30 shown in (a), a valve seat member 32 made of a copper alloy is screwed into a cylindrical valve case 31, and a valve seat 37 is made of hardened steel or stainless steel. A valve element 33, which is a spherical ball, is elastically urged by a spring 34 and seated. Reference numeral 35 is a seat for the spring 33, and a plurality of thin oil passage holes 36 are formed therein.

The basic structure of the product of the present invention shown in FIG. 2 (b) is the same as that of the conventional product shown in FIG. 2 except for the soft valve seat member 38. Anyway,
Those that basically have the same function are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the soft valve seat member is made of polypropylene or nylon (registered trademark) such as 6 nylon or 66 nylon, and is made of a soft synthetic resin having high toughness, and is press-fitted into the valve case 31. The valve element 33 is not limited to being made of metal,
As a result of the test, it was confirmed that a synthetic rubber having a hardness of 65 (for example, neoprene) is also practical.

Next, the diaphragm pump 10 shown in FIG.
The operation of will be described. First, when the drive rod 16 reciprocates by a crank mechanism (not shown), the diaphragm 13 connected to the tip of the drive rod 16 reciprocates to expand or contract the volume in the pump chamber 20. And pump room 2
When the volume inside 0 increases, the one-way valve interposed in the discharge passage member 24 blocks the reverse flow, so that only the one-way valve 30 opens from the inflow passage member 23 and the liquid containing the fine powder of the hard material is sucked. It Then, when the volume in the pump chamber 20 contracts, on the contrary, the one-way valve 3 provided in the inflow passage member 23
The valve 0 is prevented from opening, and only the one-way valve 30 provided in the discharge passage member 24 is opened, and the liquid containing the fine powder of the hard material is pressurized by the diaphragm 13 and sent out through the discharge passage member 24.

One-way valve 3 provided on both passage members 23, 24
When the 0 seats, the valve element 33 and the soft valve seat member 3
The hard fine powder contained in the fluid interposed between 8 is sandwiched between them. Since the soft valve seat member 38 is made of a tough synthetic resin, when the valve body 33 is seated,
Stable operation is possible without causing cracks or cracks due to hard foreign matter sandwiched between the valve body 33 and the valve body 33. The hard foreign matter elastically deforms the valve seat 37 to form a small concave portion, and the small concave portion is recessed therein. Therefore, no friction is generated between the foreign matter and the valve body 33 or the soft valve seat member 38, and therefore Excessive wear can be prevented.

[0012]

As described above, according to the present invention, the valve seat material of the one-way valve used in the reciprocating pump for the liquid containing the fine powder of the hard material is formed of the high toughness soft synthetic resin. Even if the fine powder is caught between the valve body and the valve seat,
This reduces the frequency of wear between them,
It has the effect of significantly improving its durability.

[Brief description of drawings]

FIG. 1 is a sectional view of a reciprocating pump according to the present invention.

FIG. 2 is a cross-sectional view showing an enlarged main part thereof.

3 is a sectional view of a conventional one-way valve corresponding to FIG.

[Explanation of symbols]

 11 Drive Case 12 Pump Case 13 Diaphragm 17 Communication Pipe Member 30 One-way Valve 31 Valve Case 32 Valve Seat Member 33 Valve Body 38 Soft Valve Seat Member

Claims (3)

[Claims] 1. A suction chamber connected to an inflatable / depressible pump chamber via a one-way valve allowing a flow into the pump chamber, and a discharge passage connected to a pump chamber allowing a flow from the pump chamber via a one-way valve. In the reciprocating pump having the above-mentioned pump, the two-way valve is composed of a valve body which is seated on a valve seat by a spring, and the valve seat is formed of a high toughness soft synthetic resin. 2. The wear prevention device according to claim 1, wherein the high toughness soft synthetic resin forming the valve seat is polypropylene. 3. The wear prevention device according to claim 1, wherein the high toughness soft synthetic resin forming the valve seat is nylon.