JPS622084A - Three way fluid control valve with check valve - Google Patents

Abstract

PURPOSE:To avoid any sliding portion for improved durability and reliability by composing a valve for controlling communication and interruption between a load port, pressure supply port and return port of two conjoined spherical valves. CONSTITUTION:A first spherical valve member 11 is in abutment against a second spherical valve member 10 and allows flow of pressure oil from a pressure supply port (a) to a load port (b), when the pressure of the pressure supply port (a) is lower than that of the load port (b). In the reverse case, it closes the pressure supply port (a) to prevent reverse flow, serving as a check valve. When an actuating member 18 is in its inoperative condition, the self-pressure of the pressure supply port (a) causes the second spherical valve member 10 to interrupt communication between the load port (b) and the pressure supply port (a), permitting communication between the load port (b) and a return port (c). The first and second spherical valves members 11, 10 do not slide but rotate, causing no adhesion of dust thereto and thereby provision of high durability.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a three-bottom, two-position valve that controls working fluid using electromagnetic force with a check to prevent backflow from the load port to the pressure supply port. The present invention relates to a check valve material three-way fluid control valve having a valve structure of a fluid switching part in a fluid control valve with an attached function.

(Conventional Technique W) As a conventional technique, for example, there is a technique disclosed in Japanese Patent Publication No. 49-10371 or Japanese Patent Application Laid-open No. 44671-1982.

All of these technologies are characterized in that the valve structure balances fluid pressure. For this reason, the number of parts increases, the parts require special shapes, and the processing precision is required to be even higher.

(Problem to be solved by the invention) These technologies are 3-point, 2-position valves, but because they do not have the above-mentioned check function, it is necessary to prevent reverse flow from the load port to the supply port in the circuit. A check valve shall be provided. Also, for those with a check function, the 6th
The one shown in the figure is known, but in this case a check valve is built into the poppet, making the process complicated and expensive. Furthermore, since it has a sliding part, it has a structure that is susceptible to dust.

The entire purpose of the present invention is to solve these problems, and by eliminating the sliding part of the poppet valve etc. due to fitting and fitting and sliding, there is no sticking of the valve due to dust (resistance to dust), and it is highly durable. A 3-way fluid control valve with check valve material that is easy to manufacture, highly reliable, and capable of always achieving stable and accurate operation without malfunction even in the face of unexpected increases in supply pressure. It's all about providing.

(Means for Solving the Problems) For this reason, the present invention provides an operating member that selectively connects the load boats provided in the valve body with the pressure supply boat (total permissible force) and the return boat. 1st block
a first spherical valve body disposed within the valve body for full movement between positions or a second position permitting communication between the load boat and the return boat; and in the first position, the spherical valve body; When the pressure of the pressure supply boat is lower than the pressure of the load boat, communication between the load boat and the pressure supply boat is maintained, and when the opposite is true, the pressure supply boat is closed. Tesori.

and a second spherical valve body movably disposed within the valve body so as to cut off communication between the load boat and the load boat, and completely cut off communication between the load boat and the pressure supply boat in the second position. This is a three-way fluid control valve with a check.

(Function) When the actuating member is in the actuating state, for example by an electromagnetic device, the actuating member (the first spherical valve body is moved to the first position and the load boat is completely connected to the pressure supply boat. At this time, the first spherical valve body contacts the second spherical valve body, and when the pressure of the pressure supply boat is lower than the pressure of the load boat, the communication from the pressure supply boat to the load boat is interrupted. When the flow is reversed, the pressure supply boat is closed to completely prevent backflow and acts as a check valve.When the operating member is in an inactive state, the pressure supply boat's self-pressure The second spherical valve element completely blocks communication between the load boat and the pressure supply boat, the first spherical valve element is moved to the second position, allowing communication between the load boat and the return boat, and the communication from the load boat to the return boat is allowed. It is operated so that there is a steady flow of pressure oil without leakage from the pressure supply boat.

Since the first and second spherical valve bodies roll without sliding, they are not stuck by dust and have high durability. Even when abnormal pressure occurs in the pressure supply boat, communication with the load boat is cut off, thereby preventing malfunction.

(Embodiment) An embodiment of the present invention will be described below based on all the drawings. Seat (a) with part 2 and boat hole (b) where fluid enters and exits (b) Spacer (3) without, and load boat - all with,
and a seat (7) with two steel ball abutments (5) and (6) and a spacer (with a return boat (C)')
4) is inserted. Two steel balls αG and (11) for switching the fluid are inserted into the two cylindrical spaces (8) and (9) formed by the inner diameter parts of the spacer (3) and spacer (4) described above. By doing so, the fluid switching section of the valve is configured. Note that there is a triangular groove between the spacers (3) and (4) and the sheets (A) and (7) to eliminate leaks in each O ring (at 14) and the housing. Each of the above-mentioned parts is inserted and fixed into the valve body (II) via a fixed iron core α, a solenoid guide aG, and a tightening nut α. Note that the bushing rod αa, that is, the actuating member, controls the stroke displacement of the movable iron core α9. This is a part for transmitting information to the steel ball αυ.In addition, the solenoid guide 00 has an O
The ring wire has been inserted and all seals with the outside have been completed.

Coil case f that makes up the solenoid:;! the law of nature,
Parts such as the coil holder, yoke holder, manual bottle (c), and coil mounting nut (a) are the same as those of a general wet type solenoid and will not be described in detail.

Furthermore, the dimensions of the main parts will be described next. First, the steel ball (the contact area (6) between the steel ball and the seat (7) in the non-excited state)
and the opening degree S of the movable iron core α9 and the fixed iron core (G) at that time.
The distance S° is determined by determining the total length of the bushing rod αS so that SI is slightly larger than S in the non-excited state. By doing this, even in the energized state, the movable iron core and the fixed iron core will not be completely attracted to each other, so that the tank port can be completely closed. In addition, the above-mentioned opening degree S in the non-excited state and the opening degree S1 between the steel ball α0 and the contact part □□□ of the seat wire are 4i
Make sure that j X S = S'.

By doing this, the opening degree between the steel ball α0 and the contact part (5) of the seat (7) in the excited state is the same as the opening degree between the steel ball αG and the contact part (c) of the seat □□□. This makes it possible to equalize pressure loss.

The inner diameter of the seat (7) is determined by the supply pressure and the suction force of the solenoid (2). That is, the steel ball αG is pressed against the seat (7) by the supply pressure P, but unless the pressing force F is removed, the valve will not operate. Therefore, the inner diameter d of the seat (7) is determined so that Fs>F (where F is the suction force of the solenoid).

Next, the operation shown in FIG. 1 will be described. The state shown in FIG. 1 is when solenoid (2) is de-energized.

At this time, fluid flows into the pressure supply boat a, but the supply pressure forces the steel ball αG against the contact portion (5) of the seat (7), and the supply boat a is closed. The other steel ball αV is pressed against the fixed iron core (to) side.

As a result, load boat B and return boat C (tank boat)
becomes connected.

Next, the case where the solenoid (7) is excited will be described. When the solenoid (2) is energized, the movable iron core αl is attracted to the fixed iron core α, causing a stroke displacement.

The stroke displacement is transmitted to the steel ball HE via the bushing rod α8, and the steel ball αη is
) to be forced upon. As a result, the return port (tank port) becomes closed. As a result of being simultaneously transmitted to the other steel ball αG, the supply boat a and the load boat b are brought into communication. In this state, when a pressure higher than the supply pressure is applied from load port b, the steel ball C1O is pressed against the contact part (to) of the seat (a) by the pressure, so that the working fluid does not flow back to load port a.

In other words, it has the function of a check valve. If the state is again de-energized, the steel ball uO sheet (7) is pressed against the abutting portion (5) by the supply pressure, returning to the state shown in FIG. 1. Since the return from the energized state to the non-excited state is achieved by the pressure of the supplied fluid (/i:), no return spring is required.

In addition, when a spring (c) is inserted, more reliable operation can be obtained as shown in FIG. 3 of the embodiment.

Fig. 4 is a different embodiment of the present invention from Figs. The movement of the steel balls α0α and R is transmitted to each other. By doing this, the sheet (7')' can be made thicker, so the steel ball (10αη
The size of the steel ball can be reduced, it can be used at higher pressure, and stable movement of the steel ball can be obtained. FIG. 5 shows yet another embodiment of the present invention, in which a pin wire is inserted into the hole (12') of the sea Ill in place of the small steel ball α3 of FIG. Hole (to) (dimensioned to guide pin 4,
Oil passage 0■υ is provided on both sides of hole (12Q,
The operating sound is more reliable than in the picture.

(Effects of the Invention) As described above, the spherical valve body of the present invention, that is, the steel ball uaαυ, has no sliding parts, so it is extremely resistant to dust, and has high durability and reliability. Furthermore, since there are no sliding parts, no grinding is required, making each part easy to manufacture and extremely low cost. Further, since the pressure inside the solenoid guide αQ is always equal to the return bow 1-c (tank port) pressure, there is no need for a special pressure-resistant guide, which is also inexpensive. Furthermore, it is safe because the valve does not open even in the event of an unexpected pressure rise in the supply boat a, as in the case of the conventional product. In other words, it is possible to always obtain stable operation without malfunction, and has excellent effects such as high reliability in this respect.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an embodiment of the present invention, and Figure 2 is A of Figure 1.
3 to 5 are partial sectional views of other embodiments of the present invention that are different from FIG. 1, and FIG. 6 is a sectional view showing prior art 2. It is. 1...Pulp body a...Pressure supply boat b...Load boat C...Return boat 10...Steel ball (second spherical Valve body) 11...
・Steel ball (first spherical valve body) 13...Small steel ball (intermediate member) 15...Fixed iron core (straight horn (-)) 18...
... Butsch rod (operating member) 29 ... Bin (intermediate member) Agent Patent attorney Jun Kawachi 2'@II! 1 Figure 2 Figure 4 'l! j5 Izumi boat 1 each 4 now boat foot Kai water supply

Claims (1)

[Claims] A first position where the actuating member selectively allows communication between the load port and the pressure supply port provided in the valve body and blocks communication with the return port, or a first position where the load port and the return port allow communication with each other. a first spherical valve body disposed within the valve body so as to be movable between two positions; When the pressure of the pressure supply port is lower than the pressure of the load port by indirectly contacting each other through a member, communication between the load port and the pressure supply port is maintained, and when the pressure supply port is opposite, the pressure supply port is closed and the load is connected to the pressure supply port. a second spherical valve body disposed within the valve body so as to be movable in the second position to close the load port and disconnect it from the pressure supply port; Features a 3-way flow control valve with a check valve.