JPH06288341A - Electromagnetic pump - Google Patents

Abstract

PURPOSE:To prevent wear and allow long-time operation by forming a suction valve cylinder and a discharge valve cylinder from a metal material having mechanical strength. CONSTITUTION:An electromagnetic pump has a suction valve cylinder 18 fixed to a suction valve seat 25 to internally install the residual member of a suction valve mechanism 30, and the suction valve seat 25 is fixed to a suction joint 1 and integrated thereto. Further, a discharge valve mechanism 31 is formed of a discharge valve seat 29 integrally formed with a piston 9, a discharge valve body 14 brought into contact with the discharge valve seat 29, and a discharge valve spring receiver 22, a discharge valve spring 24 between the discharge valve body 14 and the spring valve spring receiver 22, and a discharge valve cylinder 19 fixed to the piston 9 to internally install the residual member of the discharge valve mechanism 31. The suction valve cylinder 18 and the discharge valve cylinder 19 are formed from a metal material having mechanical strength. Thus, they can be prevented from being worn, and withstand long-time operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump for pumping a refrigerant such as an air conditioner.

[0002]

2. Description of the Related Art A conventional electromagnetic pump of this type includes an electromagnetic coil, a non-magnetic plunger case provided coaxially with the electromagnetic coil, and a slidable fit in the plunger case. A plunger, a piston slidably fitted to the cylinder on the same core as the plunger, a suction joint provided upstream of the piston, and a discharge joint provided downstream of the plunger, The plunger and the piston are reciprocally supported by the upper spring and the lower spring in a mutually pressure-supported state, and the suction valve mechanism 30 'in the suction joint is attached to the suction valve cylinder 18' as shown in FIG. It is inserted into the suction joint 1 ′ together with the receiver 21 ′, the suction valve spring 23 ′, the suction valve body 13 ′, and the suction valve seat 25 ′.
It was fixed at 6. The discharge valve mechanism 31 'is as shown in FIG.
The discharge valve cylinder 19 'is provided with a discharge valve spring receiver 22' and a discharge valve spring 2
4 ', the discharge valve body 14', and the discharge valve seat 27 were put in, inserted into the upper part of the piston 9 ', and held by the plunger 8'. The valve bodies 13 ′ and 14 ′ of the suction and discharge mechanism are fluororesin elastic bodies, the valve seats 25 ′ and 27 are rubber elastic bodies, the valve cylinders 18 ′ and 19 ′ are resins, and the spring supports 22 ′ and 2 are.
3'is a SUS material, and all of them are mold-molded products. When the refrigerant is pressure-fed by the conventional electromagnetic pump as described above, the refrigerant becomes a two-phase refrigerant in which the liquid and the gas are mixed depending on the temperature and the pressure. Wear is promoted because they rub against each other.
Also, in the method of sealing the valve seat material of the suction mechanism and the discharge mechanism by using a rubber elastic body and pressing it with a retaining ring or a plunger, problems occur in the gas permeability to the rubber and the sealing property at low temperature. I couldn't stand continuous operation.

[0003] In all cases, there are many inconveniences in pumping the refrigerant by the conventional electromagnetic pump.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electromagnetic pump that is structurally strong enough to withstand refrigerant pumping, and has a material strength that can prevent wear and withstand long-term operation.

[0005]

In order to achieve the above object, in the present application, the structure described in claim 1 is adopted, that is, the intake valve mechanism 30 is in contact with the intake valve seat 25. Body 13, suction valve spring receiver 21, suction valve body 1
3 and the intake valve spring receiver 21 and an intake valve cylinder 18 that is fixed to the intake valve seat 25 so as to accommodate the remaining members of the intake valve mechanism 30 in the intake valve seat 23. 25 is fixed to the suction joint 1 and is integrated, and the discharge valve mechanism 31 is integrally formed with the piston 9, and a discharge valve seat 29, and the discharge valve body 1 abutting on the discharge valve seat 29.
4, the discharge valve spring receiver 22, the discharge valve spring 24 between the discharge valve body 14 and the discharge valve spring receiver 22, and the piston 9 are fixed so as to house the remaining members of the discharge valve mechanism 31. This can be achieved by an electromagnetic pump characterized by comprising the discharge valve cylinder 19.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on embodiments. FIG. 1 is a vertical sectional view of an electromagnetic pump according to the present invention. Figure 2
3 and 4 show a conventional intake valve assembly and discharge valve assembly.
4 shows the intake valve assembly according to the present invention, and FIG. 5 shows the discharge valve assembly according to the present invention.

Referring to FIG. 1, in the electromagnetic pump for pumping refrigerant, the plunger 8 slides in the plunger case 3 in the electromagnetic coil 6 and the piston 9 slides on the cylinder 10 on the same axis as the plunger 8. It fits freely.
The intake valve cylinder 18 includes an intake valve spring receiver 21 and an intake valve spring 23.
Then, after the suction valve body 13 is inserted, the suction valve seat 30 is press-fitted to form the suction valve mechanism 30. The suction valve seat 25 is press-fitted into the suction joint 1 of the main body to fix the suction valve mechanism 30 to the suction joint 1.

In the discharge valve cylinder 19, the discharge valve spring receiver 22, the discharge valve spring 24 and the discharge valve body 14 are inserted so as to abut on the discharge valve seat 29 on the upper part of the piston 9, and then press fit onto the upper part of the piston 9. The discharge valve mechanism 31 is configured. The intake valve cylinder 18 and the discharge valve cylinder 19 are made of a metal material having a mechanical strength higher than that of the resin material.

In FIG. 4, the intake valve mechanism is assembled by inserting the intake valve spring receiver 21, the intake valve spring 23, and the intake valve body 13 into the intake valve cylinder 18 so as to abut the intake valve seat 25,
The suction valve cylinder 18 is fixed to the suction valve seat 25 by press fitting or screwing.

In FIG. 5, in the assembly of the discharge valve mechanism, the discharge valve spring receiver 22, the discharge valve spring 24, and the discharge valve body 14 are attached to the discharge valve cylinder 19 on the discharge valve seat 29 above the piston 9. After insertion, the discharge valve cylinder 19 is fixed to the upper portion of the piston 9 by press fitting or screwing. The upper part of the piston 9 is integrated so as to form the discharge valve seat 29.

The part where the piston 9 and the cylinder 10 are fitted together, and the material of the piston 9 is a stainless steel material which has been subjected to a hard chrome or liquid nitrocarburizing treatment in order to increase the surface hardness.

As the material of the cylinder 10, carbon fiber is added to the heat resistant resin in order to increase the mechanical strength, and fluorine resin powder is added to reduce the sliding resistance.

The part of the plunger 8 where the plunger 8 and the plunger case 3 are fitted is made of ferritic electromagnetic stainless steel, and liquid soft nitriding treatment is performed to increase the surface hardness to further improve sliding resistance. In order to reduce the amount, use one that has been treated with Teflon.

The material of the plunger case 3 is phosphor bronze, which has good corrosion resistance, fatigue resistance and spreadability. The operation of the electromagnetic pump according to the present invention will be briefly described. Electromagnetic coil 6
When an electric current is applied to the plunger 8, the plunger 8 together with the piston 9 moves downward from the position of the pressure balance point by the upper and lower springs 11 and 12 toward the lower magnetic path 5, and hence downward in FIG. And the inside of the cylinder 10 are respectively moved by the magnetic attraction force, and at this time, the suction valve body 13 is closed and the pressure between the suction valve body 13 and the discharge valve body 14 rises, so the discharge valve 14 opens and The liquid moves into the upper spring seat 28. The suction valve body 13 and the discharge valve body 14 are made of a material in which carbon fiber is added to the fluororesin having excellent corrosion resistance to increase mechanical strength, and molybdenum is added to further reduce rubbing resistance. To do. In addition, zirconia (ceramic) having excellent corrosion resistance and relatively toughness may be used.

Next, when the current to the electromagnetic coil 6 is cut off, the magnetic attraction force disappears, and the repulsive force of the lower spring 12 causes the plunger 8 and the piston 9 to return to their original positions. The discharge valve body 14 is closed, and the suction valve body 13 and the discharge valve body 14 are closed.
Since there is a negative pressure between the two valve bodies, the suction valve body 13 opens and the liquid flows in through the suction joint 1, and at the same time, the liquid in the upper spring seat 28 is discharged through the discharge joint 2. By repeating this, the pumping action is performed.

The pump of the present invention and the conventional pump are set at 10 °
A durability test was conducted by circulating an electromagnetic pump using a water tank kept constant at 14 ° C. and a cooling device, and a comparative experiment was conducted. In addition, Freon R22 is used as the refrigerant, and the side glass is used so that the liquid amount is 50% of the liquid receiver. When the electromagnetic pump is operated in this state, it can be confirmed that the front side of the pump is a two-phase refrigerant in which liquid and gas are mixed. In the conventional pump, the abrasion of the sliding part occurred in 1,000 hours. When abrasion occurred, the contamination of the circulating liquid refrigerant could be visually confirmed through the side glass. The pump of the present invention reaches 10,000 hours,
No wear of sliding parts is observed. (The side glass did not become dirty even after operation.) No lubricant such as oil was used in the test pipe.

FIG. 6 shows the pressure-liquid amount characteristics when the pump is operating (the liquid was measured with gasoline), and the horizontal axis shows the pressure (kgf / cm ² ).
The vertical axis represents the liquid volume (l / min.). The solid line shows the case of one pump, and the dotted line shows the operation when two pumps are connected in parallel. The pressure does not change, but the liquid volume doubles. The one-dot chain line shows two pumps connected in series. When connected, the liquid volume does not change but the pressure doubles. When operating with two units, each pump connects the commercial power supply to the electromagnetic coil as a diode and energizes the half-wave rectification power supply, but if the connection direction of the diode is reversed and the phase is shifted by 180 °,
There is an advantage that the operating vibration and the pulsation of the liquid can be canceled.

[0018]

EFFECTS OF THE INVENTION The cooling pressure pump has a pipe length of 10 m.
There is the above, because the discharge pressure that anticipates the pressure loss is required,
It is a relatively high pressure positive displacement pump. There is also a motor-driven Wesco type pump, but when liquid is gasified by temperature and pressure, so-called cavitation accompanied by sound and vibration occurs. Further, in the case of the conventional electromagnetic pump, in that case, the valve mechanism portion is worn and cannot be used for a long time.

According to the construction of the suction valve mechanism and the discharge valve mechanism of the electromagnetic pump according to the present invention, even if gas is mixed in the liquid, it can withstand a long time operation without any trouble, and When two units are connected as in the above-mentioned embodiment and operated to obtain a desired pressure-liquid amount, the durability, which is the object of the present invention, exerts a great effect.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electromagnetic pump according to the present invention.

FIG. 2 is an assembly view of a conventional intake valve mechanism.

FIG. 3 is an assembly diagram of a conventional discharge valve mechanism.

FIG. 4 is an assembly diagram of an intake valve mechanism according to the present invention.

FIG. 5 is an assembly diagram of a discharge valve mechanism according to the present invention.

FIG. 6 is a diagram showing a pressure-liquid amount characteristic of the present invention.

[Explanation of symbols]

 1 Suction Joint 3 Plunger Case 6 Electromagnetic Coil 8 Plunger 9 Piston 11 Upper Spring 12 Lower Spring 13 Suction Valve Body 14 Discharge Valve Body 18 Suction Valve Cylinder 19 Discharge Valve Cylinder 21 Suction Valve Spring Bearing 22 Discharge Valve Spring Bearing 23 Suction Valve Spring 24 Discharge valve spring 25 Suction valve seat 29 Discharge valve seat 30 Suction valve mechanism 31 Discharge valve mechanism

Claims (3)

[Claims] 1. A plunger 8 and a piston 9 are disposed in a plunger case 3 in contact with each other by an upper spring 11 and a lower spring 12, and an intake valve mechanism 30 in an intake joint 1 below the lower spring 12 is provided. And a discharge valve mechanism 31 between the plunger 8 and the piston 9, and the magnetic force of the electromagnetic coil 6 causes the plunger 8 and the piston 9 to integrally reciprocate in the plunger case 3. In the pump, the intake valve mechanism 30 is in contact with the intake valve seat 25, the intake valve body 13, the intake valve spring receiver 21, the intake valve spring 23 between the intake valve body 13 and the intake valve spring receiver 21, The suction valve seat 25 has a suction valve cylinder 18 that is fixed so as to house the remaining members of the suction valve mechanism 30, and the suction valve seat 25 is fixed to the suction joint 1 to be integrated with the suction valve seat 25. 31
A discharge valve seat 29 integrally formed with the piston 9,
The discharge valve body 14 that contacts the discharge valve seat 29, the discharge valve spring receiver 22, the discharge valve body 14 and the discharge valve spring receiver 22.
An electromagnetic pump comprising: a discharge valve spring 24 between and a discharge valve cylinder 19 which is fixed to the piston 9 so as to accommodate the remaining members of the discharge valve mechanism 31. 2. A suction valve cylinder 18 for a suction valve seat 25.
2. The electromagnetic pump according to claim 1, wherein the fixing of the discharge valve cylinder 19 to the piston 9 is press fitting or screwing. 3. The electromagnetic pump according to claim 1, wherein the intake valve cylinder 18 and the discharge valve cylinder 19 are made of a metal material having mechanical strength.