JPH04341674A - Flow proportional valve with shutoff function - Google Patents

Abstract

PURPOSE:To secure a shutoff functional flow proportional valve that controls a flow rate of fluid up to an optional flow value from zero through an amount of current-energization to a solenoid, and being controllable even by manual operation. CONSTITUTION:This valve is one that operates a plunger 9 by means of current- energization to a solenoid 7, and drives a pilot type water-stop valve 16 and control valve element 22 controlling a flow rate at the same time via a shaft 20. This shaft 20 is operable by manual operation from the outside by a forcible driving means 28, that is, the control valve element 22 is holdable to optional valve opening by manual operation, thus a supply of hot water at the time of power failure and freeze-proofing drainage is also easy to be done.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates primarily to a proportional flow valve with a closing function for controlling the flow rate of hot water.

0002

2. Description of the Related Art Conventionally, a general pilot type solenoid valve has a structure as shown in FIG. When the solenoid 1 is energized, the plunger 2 is attracted, the pilot hole 3 is opened, and the pressure difference across the diaphragm 4 causes the valve 5 to lift and water to flow. When the solenoid 1 is de-energized, the plunger 2 is pushed out by the spring 6 and closes the pilot hole 3. Then, water enters the front and rear chambers of the diaphragm 4 through small holes (not shown) provided in the diaphragm 4, and when the pressure difference disappears, the valve 5 closes due to the difference in the pressure receiving areas of the diaphragm 4 and the valve 5. A is an inlet and B is an outlet.

0003

[Problem to be solved by the invention] However, the above configuration cannot be used during a power outage, and even if water is drained from the front and back of the valve body to prevent freezing, the water around the plunger 2 is not completely drained. There was a problem that it could not be done and it would stick and it would take time to re-water the water.

[0004]The present invention has been made to solve the problems of the prior art, and aims to provide a flow rate proportional valve mainly used for hot water, which has a simple structure, can be manually operated, and can proportionally adjust the flow rate. do.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the flow rate proportional valve of the present invention includes a solenoid, a driving force generating means that generates a force externally depending on the amount of current applied to the solenoid, an inflow path and an outflow path. a valve casing having a passage, a water stop valve provided in the valve casing, a first valve seat corresponding to the water stop valve;
a control valve body provided downstream of the water stop valve to adjust the flow rate;
It consists of a second valve seat corresponding thereto, a shaft that receives the load of the driving force generating means and drives the water stop valve and the control valve body, and a forced drive means that manually drives the shaft from the outside. .

[0006]

[Operation] With the above configuration, when current is applied to the solenoid, the water stop valve is first lifted through the shaft driven by the driving force generating means, and a flow is generated to the control valve body.When the current value is further increased, The control valve body is lifted to enlarge the opening and increase the flow rate. In other words, the control valve body is lifted to an arbitrary position to adjust the flow rate depending on the magnitude of the current value flowing to the solenoid. On the other hand, when the current to the solenoid is cut off, the driving force generating means causes the control valve body and the water stop valve to contact the corresponding valve seats in this order through the shaft, thereby stopping the flow. Even when the current to the solenoid is cut off, the forced drive means allows you to manually move the shaft and control the valve body.
The water stop valve can be lifted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a flow rate proportional valve in one embodiment of the present invention. In FIG. 1, there is a solenoid 7 and a pipe 8 whose one end surface is sealed, and a plunger 9, which is a driving force generating means driven by the amount of electricity supplied to the solenoid 7, slides inside the pipe 8. A valve housing 12 having an inflow path 10 and an outflow path 11, and a first diaphragm 13 as a first pressure receiving body provided in the valve housing 12,
Water stoppage in which the first diaphragm 13 directly contacts or separates from the first valve seat 15 due to the pressure difference between the first diaphragm 13 and the first back pressure chamber 14 which is partitioned while being in slight communication with the primary side thereof. It also serves as valve 16. The water cutoff valve 16 (first diaphragm 13) is provided with a first spring 17 as a first biasing means that biases the water stop valve 16 (first diaphragm 13) in a direction to contact the first valve seat 15. In order to open and close the water stop valve 16, a first communication hole 18 that communicates the first back pressure chamber 14 with the secondary side of the water stop valve 16, and a pilot that opens and closes the first communication hole 18. A valve 19 is provided. This pilot valve 19 is connected to the plunger 9 via a shaft 20, and serves as a second urging means for urging the pilot valve 19 in a direction to close the first communication hole 18. Spring 21
is provided behind the plunger 9. Downstream of the water stop valve 16, the valve housing 12 is provided with a conical control valve body 22 for adjusting the flow rate and a corresponding second valve seat 23. The outer diameter of the control valve body 22 is configured to be as close as possible to the diameter of the second valve seat 23 and smaller than the diameter of the valve seat 23. In order to balance the control valve body 22 with the primary pressure of the fluid, a grooved second diaphragm 24 as a flexible pressure receiving body is connected between the control valve body 22 and the valve housing 12, Furthermore, the groove 24a is made deep so that the effective pressure receiving area is always equal to the diameter of the second valve seat 23, regardless of the lift amount of the control valve body 22. A second back pressure chamber 25, which is completely partitioned from the primary side by the second diaphragm 24, and the secondary side of the control valve body 22 communicate with each other through a second communication hole 26. The control valve body 22 has a third spring 2 as a third urging means.
7, it is biased in the direction of contacting the second valve seat 23. The control valve body 22 and the second diaphragm 24
A shaft 20 passes through the center of the plunger 9,
The control valve body 22, the second diaphragm 24, and the pilot valve 19 are arranged in this order. That is, the plunger 9 is fixed to the end surface of the shaft 20, and the pilot valve 19 is configured on the opposite end surface. That is, as the plunger 9 lifts, the pilot valve 19 lifts, and the control valve body 22 subsequently lifts. On the other hand, a forced drive means 28 for manually driving the shaft 20 is provided on the opposite side from the solenoid 7. Figure 2 shows its detailed diagram. By turning the knob 30 using the screw mechanism 29, the shaft 20 can be pushed up, and the pilot valve 19 and the control valve body 22 can be lifted.

With the above configuration, when current is applied to the solenoid 7, the plunger 9 is attracted against the second spring 21, and the pilot valve 19 opens the first communication hole 18. Then, due to the pressure difference between the primary side and the first back pressure chamber 14 that sandwich the first diaphragm 13, the first diaphragm 13, that is, the water stop valve 16, lifts against the first spring 17. The first valve seat 15 opens, allowing flow to the control valve body 22 . When the current value is further increased, the control valve body 22 lifts, the opening becomes larger, and the flow rate increases. In other words, the control valve body 22 is lifted to an arbitrary position depending on the magnitude of the current value flowing to the solenoid 7 to adjust the flow rate. On the other hand, when the current to solenoid 7 is cut off, plunger 9
The pilot valve 19 closes the first communication hole 18 at the same time as the control valve body 22 closes, thereby causing the primary side and the first back pressure chamber 14 that sandwich the first diaphragm 13 to close. The pressure difference disappears, and the water stop valve 16 closes due to the difference in pressure receiving area.

In this embodiment, even if the solenoid 7 cannot be energized due to a power outage or the like, a forced drive means 28 is provided to manually drive the shaft 20 when it is desired to discharge hot water. Moreover, the hot water can be ensured by a simple operation of turning the knob 30. In addition, by keeping this knob 30 turned, water can be easily drained from the front and rear of the control valve body 22, and the flow can be ensured even when water is supplied again, even if the vicinity of the plunger 9 is Even if it is stuck due to freezing, it can be quickly thawed by passing water and can be controlled electrically. Further, in the event that the control valve body 22 becomes unable to be driven by the suction force of the plunger 9 due to increased sliding resistance due to dust or scale, the forced drive means 28 can be used to manually apply force.

0010

As described above, according to the flow rate proportional valve of the present invention, the following effects can be obtained. (1) If the control valve body is maintained in a lifted state by the forced drive means, water can be easily drained from the front and back of the control valve body, and the flow will be ensured even when water is recirculated. Even if the area near the plunger is frozen, it can be thawed quickly by passing water, and normal electrical control can be performed immediately. (2) In the unlikely event that the sliding resistance of the control valve body increases due to dust or scale, and the plunger cannot be driven by the suction force, the forced drive means can be used to manually apply force.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional view of a flow rate proportional valve according to an embodiment of the present invention.

[Figure 2
] Enlarged sectional view of the forced drive means of the flow proportional valve of the same embodiment

[Figure 3] Cross-sectional view of a conventional flow rate proportional valve

[Explanation of symbols]

7 Solenoid 9 Plunger (driving force generation means) 10 Inflow path 11 Outflow path 12 Valve housing 15 First valve seat 16 Water stop valve 20 Shaft 22 Control valve body 23 Second valve seat 28 Forced drive means

Claims (1)

[Claims] 1. A solenoid, a driving force generating means for generating an external force depending on the amount of current applied to the solenoid, a valve housing having an inflow passage and an outflow passage, a water stop valve provided in the valve housing, and a first valve seat corresponding to the water stop valve; a control valve body provided downstream of the water stop valve to adjust the flow rate; and a second valve seat corresponding thereto; A flow rate proportional valve with a closing function, comprising a shaft that drives the water stop valve and the control valve body, and a forced drive means that manually drives the shaft from the outside.