JPS59155677A - Energized closed pilot operated solenoid valve - Google Patents

Abstract

PURPOSE:To open/close a solenoid valve quickly and reliably by making the length between a valve seat and the leading edge of guide rod longer than the sum of plunger blind hole and the thickness of upperboard. CONSTITUTION:Fluid inlet and outlet A, B are provided to valve body 1 to open/close a planar main valve seat 2 communicating between them. The length from the leading edge of guide rod 7a to be inserted through a pilot hole (e) to valve seat (76) is set longer than the sum of depth of blind hole 9b and the thickness of main valve body upperboard 3b where the cross-section of gap between the guide rod 7a to be inserted through said pilot valve hole (e) and valve hole (e) is made larger than the cross-section of small hole (d) penetrating through the circumferential wall of main valve body housing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupled closed type pilot actuated one-part valve in which the main valve quickly and reliably opens and closes after input of an opening/closing signal to a closed coil. Refrigeration system in the industrial field of use,%
It can be suitably used as a solenoid valve for each evaporator in a refrigeration system having a plurality of evaporators in a cold storage room of a V-refrigerated alpha carrier.

An example of an energized closed type pilot-operated solenoid valve used in a refrigeration system is shown in Japanese Utility Model Application No. 2487 (1987). As shown in this figure, when the current is not energized (state shown), as the plunger f91 descends, the pilot valve (7) moves downward at the rod (101) fixed to the tip of the plunger. When pressed, the pilot hole tel is opened against the elasticity of the spring (8a), and the fluid flows through the inlet (4).
5 gaps ((4), guide holes (al, fbl, pilot hole (C), flow path (dl), side path (131), exit pipe (I2
) is formed, and in this flow path, the main valve (
Since the gap (Ql) between the inner wall of the main valve (3) and the empty chamber tc) is set smaller than that of the pilot hole fe),
) The amount flowing out from the top surface (back side) is greater than the amount entering (
, main valve (31 The fluid pressure on the top surface is lower than the pressure on the bottom surface,
The pressure difference acts on the cross-sectional area of the main valve, causing the main valve to float upward and come into contact with the stow bar (4) and stop, opening the main valve seat (2).

Next, when the electromagnetic coil (18) is energized, the plunger (9)
is attracted to the attractor (I5) by the excitation of the electromagnetic coil (18), and the rod (10) at the tip of the plunger is inserted into the pilot hole t.
Close al. The fluid that entered from the inlet port enters the empty chamber (
C).

Gap (φ, pilot hole tel at guide hole 1al, Ib1 etc.
As soon as it reaches the lower surface, it is closed again, and the fluid pressure on the upper and lower surfaces of the main valve (3) becomes equal, so the main valve (31 It closes at the valve seat i21'.

As described above, the opening/closing operation of the energized closed type pilot-operated solenoid valve is as follows: First, the pilot valve is operated by the energized/de-energized signal to the electromagnetic coil to open and close the pilot hole. The main valve is opened or closed by the fluid pressure difference generated between the valves. Therefore, after the pilot valve opens, a certain pressure difference is generated between the upper and lower surfaces of the main valve (during valve opening operation), or 7) when the valve closes, the pressure difference between the upper and lower surfaces of the main valve becomes equal. until (valve closed I
There is a slight time delay during the auxiliary operation), and there is a problem that the opening/closing operation of the main valve is not performed promptly after the opening/closing signal is input.

The technical problem to be solved by the present invention is to quickly (and almost accurately) open and close the main valve by inputting an open or close signal to the electromagnetic coil in the energized closed type Hi-Rot type a valve.

The technical means of the present invention taken to solve these technical problems are as follows.

(a) The main valve seat is a flat valve.

(b) The main valve body is an inverted cup-shaped box consisting of an upper plate whose surface facing the main valve seat is parallel to the valve seat surface, and a peripheral wall that is integral with the upper plate, and the center of the upper plate is A pilot valve hole is provided through the valve body, and a small guide hole is provided in a part of the peripheral wall to conduct the inside and outside of the main valve body case, and the lower end of the peripheral wall is placed on an interior fitting that is screwed onto the valve body. A main valve spring is provided whose outer surface of the peripheral wall is slidably inscribed in the inner wall of the valve body and presses and urges the main valve element toward the valve seat, and (c) a pilot valve element having a guide rod inserted into the pilot hole is the main valve spring. A pilot valve seat is formed on the pilot valve body to be slidably accommodated in the internal fitting in the main valve body in the valve body, and to open and close an opening in the main valve face body of the pilot hole, and the pilot valve body closes the pilot hole. (d) A blind hole is provided at the lower end of the plunger, a guide rod of the pilot valve body is inserted into the hole, and the tip of the guide rod approaches and separates from the bottom of the blind hole. The tip of the peripheral wall of the blind hole is movable toward and away from the upper surface of the upper plate of the main valve body, and the peripheral wall of the blind hole has a through hole that conducts the inside and outside of the blind hole, and a plunger spring that biases the plunger toward the main valve body. (e) The length from the valve seat position of the pilot valve element to the tip of the guide rod is set to be greater than the sum of the depth of the Pushinger blind hole and the thickness of the upper plate.

(f) The cross-sectional area of the gap between the guide rod inserted through the pilot valve hole and the pilot valve hole is set to be larger than the cross-sectional area of the small guide hole passing through the peripheral wall of the main valve body housing.

The above technical means works as follows.

When a energizing signal is input to the electromagnetic coil when it is not energized, the plunger is attracted to the fixed iron core and rises against the plunger spring. The main valve body was pressed by the tip of the circumferential wall of the blind hole at the tip of the plunger against the top surface of the upper plate and descended to open the main valve seat, and the main valve body was pressed by the bottom of the blind hole and descended via the guide rod to open the pilot valve hole. The pilot valve body follows the rise of the plunger and rises equally due to the elasticity of the main valve spring or pilot valve spring, and the drop in fluid pressure due to the increase in volume within the main valve body box is caused by a small guide hole or a blind hole. Fluid is replenished through the conduction hole and the pilot valve hole, so that the fluid pressure inside and outside the case is always equal, and the main valve body quickly seats on the main valve seat without any hindrance to the rise of the main valve case. Stop. At the same time as the main valve closes, the pilot valve body rises due to the elasticity of the pilot valve spring until the valve seat closes the pilot valve hole, and when the plunger rises to its maximum, the bottom of the blind hole and the tip of the guide rod separate or come into contact. , the peripheral wall of the blind hole at the tip of the plunger is separated from the upper surface of the main valve body top plate, the pilot valve body blocks the pilot valve hole, the main valve body closes the main valve seat, and the fluid flow is prevented. stop.

When the electromagnetic coil is de-energized in this state, the plunger quickly descends due to its own weight and the elasticity of the plunger spring, and first the bottom of the blind hole fully presses the tip of the pilot valve body guide rod.
The pilot valve body is lowered, the pilot valve hole is opened, and the fluid inside the main valve body housing is released from the pilot valve hole to the outlet side flow path (secondary side) of the solenoid valve. In this case, the fluid on the inlet side (-next side) enters the case through the small guide hole provided in the peripheral wall of the box, but due to the difference between the gap cross-sectional area of the pilot valve hole and the cross-sectional area of the /J'% guide hole. The pressure inside the main valve body box decreases, creating a pressure difference with the fluid pressure on the next side, and the box is in a state where it is easy to descend.In this state, the tip of the plunger comes into contact with the top surface of the main valve body upper plate. As the pressure is applied, the box will surely descend quickly, and the fluid inside the box will be discharged from the pilot valve hole and the peripheral wall guide of the blind hole into the secondary flow path, and the main valve body will be moved downwards when the lower end of the box is This is to quickly realize the valve lift that occurs when the valve comes into contact with the upper surface of the interior metal fitting.

The present invention produces the following unique effects.

(1) By extending the adjustment shaft to the interior fittings and making it possible to adjust the screw engagement from the outside, the valve lift when the valve is opened can be adjusted after setting.

The main valve body is an inverted cup-shaped box, and the lower end of the peripheral wall is
This is due to the structure in which the valve body IC is placed on an internal metal fitting that is screwed on so that it can move forward and backward.It is used in applications where the valve is de-energized and the valve is open during normal operation, and the valve is closed only when necessary. It has an effect that can be adjusted depending on the situation.

(21) When the valve is open, the fluid flow can flow in either the forward or reverse direction.
This is due to the configuration in which the

An illustrated embodiment will be described below to show a specific example of the above-mentioned technical means.

Figure 2 shows a cross-sectional view of an embodiment of the present invention, in which the valve body (1) has a fluid inlet and an outlet (B), and a flat main valve seat (2) that communicates with the two. Open and close.

The main valve body (3) has the upper surface of the upper plate (3b) of the inverted cup-shaped box facing the valve seat surface, parallel to the valve seat surface, the peripheral wall slidably touching the inner wall of the valve body, and the lower end of the upper plate (3b) facing the valve seat surface. Interior fittings 2 to be screwed onto
0) is placed on top and provided in the inlet prison side flow path. Pilot hole t passing through the center of the upper plate (3b) of the main valve body
A small conduit hole 1dl'e is drilled to connect the inside and outside of the box with the main valve body, and a main valve spring (3a) is installed inside the box to bias the main valve body towards the main valve seat. . In addition, the interior metal fittings 2 (
J) is equipped with an adjustment shaft (28) k that extends from the outside to the interior fittings (
20) can be advanced and retreated.

A pilot valve body (7) having a guide rod (7a) inserted into the pilot hole tel is housed inside the metal main valve body box (3) so as to be slidable on the inner surface of the pilot hole tel. (Pilot valve seat (7b) that opens and closes the opening inside the box of 61) 'r Formed on the pilot valve body (7),
A pilot valve spring (7C) is provided to bias the valve in the direction of closing.

A plunger on the same axis as the main valve body and the pilot valve body (the lower end of the VC) is bored through a blind hole (9b), and the guide rod (7a) of the pilot valve body is inserted into the blind hole (gb). The tip of the guide rod can freely approach and separate from the bottom surface (9C) of the hole, and the peripheral wall of the blind hole (9C)
The tip of 9d) can freely come into contact with and separate from the upper surface of the main valve body upper plate (3b), and the through hole fat that conducts the inside and outside of the blind hole is connected to the peripheral wall (9d).
A plunger spring (9a) is provided to urge the plunger toward the main valve body. The length from the tip of the guide rod (7a) to the pilot valve seat (7b) is set to be greater than the sum of the depth of the blind hole (9b) and the thickness of the main valve body top plate (3b). , a small guide hole tdl that conducts the gap cross-sectional area between the guide rod (7a) inserted through the pilot valve hole (el k) and the valve hole (el) through the peripheral wall of the main valve body box.
It is set larger than the cross-sectional area of .

In the figure, (141 is the plunger pipe, (1511d fixed iron core (attractor), C7) is the outer case neck l-, (t81 is the electromagnetic coil, Q9 is the outer case, (2D is the adjustment shaft gasket, (2:
aa packing holder (23) is packing, (24a adjustment shaft bag naso), (25+ is electromagnetic case fixing nut, (2
6) shows the lower cover, and (5) shows the fixing bolt (28) as the adjustment shaft.

Next, an example in which the present invention is applied to a refrigeration system of a refrigerated carrier ship will be described. The hold of a refrigerated carrier is divided into a plurality of chambers, and each chamber is equipped with two or more evaporators to store goods, such as fish.

Predetermined temperatures are maintained for each meat, fruit, etc.

Figure 3 shows an example of a refrigeration system equipped with two evaporators and a hot gas defrost circuit. During cooling operation, the refrigerant medium flows through the X-Y flow path from the compressor 0 to the three-way switching valve (V). , through the condenser (K), the liquid receiving tank ■, and the check valve C3.
Two evaporators (B1) and (B2) in the freezer compartment (F)
The solenoid valve (Sl) of the present invention provided at each inlet of (B2) (
(open state), is depressurized by the thermostatic expansion valves (Xl) (X2), and is supplied to the evaporators (El) and (B2).

(Ct) t (C2) is a check valve (St), (8
2) Prevent inflow from any direction. Evaporator (El),
(B2) exchanges heat with the indoor load, and the solenoid valve at the outlet (B3
), (84) (open state), gas and liquid are separated in the achievreta, and the gas is returned to the compressor. It circulates through the thread path shown by the solid line in the figure. (In this case, the defrost circuit's blocking valves (V+) and (V2) are closed.) During defrosting [+d, the three-way switching valve (
When switching to the X-Z flow path with V) and defrosting the first evaporator (1εl), use the solenoid valve (S+), (82)
, (B4) is open, (B3) is closed, blocking valve vl open, v
2 Closed. The refrigerant is passed through the blocking valve (■1) → heat exchanger El (condenser in this case) → check valve (C1) → 'tortoise valve (vl)
→ Solenoid valve (V2) → Expansion valve (X2) → Evaporator (B2) →
Solenoid valve (B4) → Achimulator prisoner → Compressor (C). The system shown by the dotted arrow in the figure is taken.

In this case, the flow direction of the solenoid valve (Sl) is opposite to the normal flow, but due to the structure of the present invention shown in Fig. 2, the fluid flow can be used in either the forward or reverse direction without any problem when the valve is open. It is something.

When completely defrosting the second evaporator (B2), close the solenoid valve (Sl), (82)', (83), close (B4), open the blocking valve ■2, close Vl, and close the heat exchanger ( B2) is used as a condenser, and the flow of fluid through the solenoid valve (B2) is the reverse flow during normal operation, which is the same as in the case of the first heat exchanger defrost. In this system, evaporators (E, l), (B
2) cannot be fully defrosted at the same time, so the solenoid valve (83)
.

This is done by temporally switching (B4) with a timer or the like, and by switching the blocking valves (Vl) and (V2).

During normal use of the solenoid valves 81 to S4d used in this system (
During cooling operation), it is used in a de-energized state, and even during defrosting, it is sufficient to energize either B3 or 84, so it is much more energy efficient than when using the conventional energized open type solenoid valve. The solenoid valve opens and closes quickly when switching from normal operation to defrost operation or vice versa, which helps prevent deterioration of refrigerated products. The electromagnetic valve according to the present invention has many features such as being able to adjust the temperature to an appropriate temperature, and the solenoid valve according to the present invention is extremely suitable for use in refrigerated carrier vessels.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a conventional energized closed pilot operated solenoid valve. FIG. 2 is a sectional view of an embodiment of the present invention. FIG. 3 shows an example of a refrigeration system diagram using an embodiment of the present invention. (1)... Valve body (2)... Main valve seat (3).
...Main valve body (3a)...Main valve spring (3b)...
Upper plate (7)...Pilot valve body (7a)...Guide rod (7b)...Pilot valve seat (7C)...Pilot valve spring (9)...Plunger" (9a)
...Plunger spring (9b)...Blind hole ro4;...
・Plunger pipe u51...Fixed iron core u81...Electromagnetic coil 4...Interior fittings (28)...Adjustment shaft patent applicant Saginomiya Seisakusho

Claims (2)

[Claims] (1) In a pilot-operated solenoid valve in which the plunger, main valve element, and pilot valve element are arranged on the same central axis, (a) the main valve has a 1uk flat valve seat, and (b) the main valve element is the main valve seat. An inverted cup-shaped box is made up of a top plate whose facing surface is parallel to the valve seat surface and a peripheral wall integral with the top plate, and a pilot valve hole is installed through the center of the top plate. At the same time, a small guide hole is provided in a part of the circumferential wall to fully conduct the inside and outside of the main valve body case, and the lower end of the circumferential wall is placed on an internal fitting that is screwed onto the valve body, and the circumferential wall is slid onto the inner wall of the valve body. A main valve spring is provided which is freely inscribed in the main valve body and presses and biases the main valve element toward the valve seat, and (c) a pilot valve element having a guide rod inserted into the pilot valve hole is installed in the main valve body. A pilot valve seat that is slidably attached to the interior fitting to open and close the part is formed in a rotary valve body, and a pilot valve spring is provided that biases the bi'rod valve body in a direction to close the pilot hole; ) A blind hole is provided at the lower end of the plunger, the guide rod of the pilot valve body is inserted into the blind hole, the tip of the guide rod can be moved toward and away from the bottom of the blind hole, and the tip of the peripheral wall of the blind hole is placed above the main valve body. A conductive hole in the peripheral wall that can freely come into contact with and separate from the top surface of the plate and conducts between the inside and outside of the blind hole;
A plunger spring is provided to bias the plunger metal in the direction of the main valve body, and e) the length from the valve seat position of the pilot valve body to the tip of the guide rod is determined by the depth of the plunger blind hole and the thickness of the upper plate. (f) The cross-sectional area of the gap between the guide rod passing through the pilot valve hole and the pilot valve hole is set to be larger than the cross-sectional area of the small guide hole penetrating the peripheral wall of the entire main valve body box. (2) The energized closed type pilot-operated solenoid valve as set forth in claim 1, wherein an adjustment shaft extending from the interior metal fitting allows adjustment of the 9-position from the outside.