JPH0455280Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a direct-mounted pump type switching valve, and more specifically, by improving the position of the opening end on the valve chamber side of the valve port that communicates with the normally closed port. This invention relates to a pump direct-mounted switching valve that prevents thread waste, hair, etc. from getting entangled in the valve body.

(b) Prior art In recent years, hot water supply systems have been developed, and such hot water supply systems include so-called pump direct-attached switching valves (hereinafter simply referred to as switching valves), in which a switching valve is directly connected to the inlet of a pump that pumps out hot water from a tank. As shown in FIG. 6, the conventional structure of the valve body a is usually as shown in FIG.
A pair of valve ports d and e are opened facing each other in a valve chamber c formed in The valve port e is normally closed (when the solenoid that moves the valve body is not energized), and the valve chamber c has an inlet port k that communicates directly with the pump chamber j, which contains the pump impeller i. .

However, in such a conventional switching valve, when valve body b closes valve port e, one surface of the valve body (valve port d side) is on the valve port d side from the center of suction port k. In particular, when a hot water supply system for a bathtub is used with its valve port d connected to the bathtub, the hot water in the bathtub is circulated by the pump via the switching valve, thereby removing hair or lint in the bathtub. Dust gets entangled around the main body b, causing malfunction of the switching valve.

(c) Problem to be solved by the invention The problem to be solved by the invention is to eliminate the entanglement of dirt on the valve body in such switching valves by improving the normally open valve port.

(d) Means for Solving the Problems In order to solve the above problems, the present invention provides a valve chamber, first and second valve ports opening opposite the valve chamber, and an inlet opening opening into the valve chamber. a main body in which the first valve port communicates with a normally open port and the second valve port communicates with a normally closed port, and either one of the valve ports can be selectively closed within the valve chamber. In a pump-direct type switching valve equipped with a valve body installed in the valve body and a solenoid that moves the valve body, the distance from the center of the suction port to the opening end of the first valve port on the valve chamber side is l. ₁ , where the distance from the center to the opening end of the second port on the valve chamber side is l ₂ , the thickness of the valve body is W, and the stroke of the valve body is S, then l ₂ −W>0, l ₁ + l ₂
=W+S.

(e) Effect In the above configuration, when the solenoid is not operating and the valve body closes the second valve port, the first valve port opens, and when the pump is operating, fluid flows from the first valve port through the suction port. is attracted. At this time, since the surface of the valve body on the first valve port side is closer to the second valve port than the center of the suction port, dirt does not get wrapped around the valve body.

When the solenoid operates, the valve body closes the first valve port and opens the second valve port. Therefore, when the pump operates, suction is drawn through the second valve port and the suction port.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a pump-directly attached type switching valve 1 of this embodiment is shown. In the figure, 2 is a main body in which a valve chamber 21, a first valve port 22 communicating with a normally open port 23, and a second valve port 24 communicating with a normally closed port 25 are formed, and 3 is a valve chamber 21. 4 is a valve stem attached to the valve body, and 5 is a solenoid that moves the valve body 3 via the valve stem. The main body 2 further includes a pump 6.
A suction port 63 that opens into the valve chamber 21 from a pump chamber 62 in which an impeller 61 is rotatably arranged, and a discharge port 64 that communicates with the pump chamber 62 are formed.

The first valve port 22 and the second valve port 24 are provided to face each other, and the distance from the center O-O of the suction port 63 to the first valve seat 26 at the open end of the first valve port 22 is The distance l ₁ is greater than zero. Further, the distance l ₂ from the center O-O to the second valve seat 27 at the open end of the second valve port 24 is given by W, which is the thickness of the valve body 3 (thickness seen in the direction of movement of the valve body). l ₂ −W>0, l ₁ +l ₂ −W=
S (S is the stroke of the valve body). l ₁ ≒
An example of the case of 0 is the state shown in the second diagram, in which the valve stroke S (≈l ₂ -W) is of a size necessary to ensure the required flow rate. Further, as an example of l ₂ -W≈0, in the state shown in FIG. 3, the stroke S (≈l ₁ ) is of a size necessary to ensure the required flow rate.

As is clear from FIG. 1, the first valve seat 26 has a relatively long cylindrical shape that projects from the wall that defines the valve chamber 21, and a fourth
As shown in the figure, ribs 29 are formed at diametrically opposite positions. This rib increases the strength of the first valve seat 26 and prevents dirt from getting wrapped around its base.

The solenoid 5 is a coil 51 fixed to the main body 2.
and a fixed core 52 that is fitted and fixed within the coil 51.
and a movable iron core 53 movably inserted into the coil 51, so that the valve stem 4 is pressed through a push rod 54 fixed to the movable iron core 53. The valve stem 4 holds the valve body 3 in the second position by the spring 7.
The valve seat 27 is biased into engagement with the valve seat 27 of the valve seat 27 .

When the switching valve 1 having the above configuration is used as a switching valve for a hot water supply system in a bathtub, the normally open port 23 and the discharge port 26 of the piston are connected to the bathtub B, and the normally closed port 25 is connected to the hot water supply system as shown in FIG. connected to the source.

Under such conditions, the coil 5 of the solenoid 5
1, the valve body 3 contacts the second valve seat 27 due to the action of the spring 7 to close the second valve port 24 and open the first valve port 22. Therefore, when the impeller 61 of the pump rotates, suction is drawn from the bathtub B into the pump chamber 62 via the normally open port 23, the first valve port 22, the valve chamber 21, and the suction port 63, and the water is drawn into the bathtub via the discharge port 64. It is returned to B. The hot water is then chased by the heater H. In the flow of hot water, the valve body 2 is placed in front of the suction port 63.
Since there is a gap between the valve body 26 and the first valve seat 26, hair, lint, and other debris that enters the valve chamber 21 together with hot water from the bathtub are immediately removed to the inlet 63 without getting entangled with the valve body. is attracted to. This prevents dust from getting wrapped around or entangled with the valve body.

When the coil 51 is energized, the movable core 53 is attracted toward the fixed core 52, and the valve body 2 is moved to the first valve seat 26 via the push rod 54 and the valve stem 4.
is pressed to close the first valve port 22. Therefore, when the impeller 61 of the pump rotates, the normally closed port 25, the second valve port 24, and the valve chamber 2
1 and the pump chamber 6 from the hot water source via the suction port 63
2 into the bathtub B through the discharge port 64.
sent within.

(g) Effects According to the present invention, the following effects can be achieved.

This prevents dust from wrapping around or getting tangled around the valve body, eliminating the need for valve disassembly and repair.

It is possible to prevent a decrease in flow rate due to debris getting entangled, etc.

Internal leakage due to debris getting wrapped around can be prevented.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of one embodiment of the pump direct-mounted switching valve according to the present invention, and Figures 2 and 3 are two examples with different distances from the center of the suction port to the first and second valve seats. FIG. 4 is a diagram showing a state in which ribs are formed around the base of the first valve seat, FIG. 5 is a diagram showing an example of use of the direct pump type switching valve of the present invention, The figure is a partial sectional view showing an example of a conventional switching valve of the same type. 1: Pump direct type switching valve, 2: Main body, 21:
Valve chamber, 22: first valve port, 24: second valve port, 2
3: Normally open port, 25: Normally closed port, 3: Valve body, 5: Solenoid.

Claims (1)

[Scope of claims for utility model registration] (1) Valve chamber, first and second valve chambers opening opposite to the valve chamber.
a main body having a valve port and a suction port opening into the valve chamber, the first valve port communicating with the normally open port and the second valve port communicating with the normally closed port; In a pump direct-mounted switching valve equipped with a valve body that is provided to be able to selectively close either one of the ports and a solenoid that moves the valve body, from the center of the suction port to the first valve port. The distance from the center to the opening end on the valve chamber side is l ₁ , the distance from the center to the opening end on the valve chamber side of the second port is l ₂ , the thickness of the valve body is W, and the stroke of the valve body is A pump-directly attached switching valve characterized in that when S, l ₂ −W>0 and l ₁ +l ₂ =W+S. (2) The pump direct-mounted switching valve according to claim 1, characterized in that a rib is formed around the first valve port.