JPS6040943Y2 - flow control valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for preventing freezing of a valve portion of a control valve, such as a solenoid valve, which is used in an automobile or the like and continuously controls the amount of air when used in a cold region.

Conventionally, in control valves that control fluids that contain moisture, such as air flow control valves in vehicles, there has been a problem in which ice forms between the valve body and the valve seat, causing the valve to no longer function as a valve.
In particular, if such a problem occurs when starting the engine of a car early in the morning in the winter, it will hinder the engine's smooth startup and cause significant problems with driving performance. ) It became necessary to thaw the ice on the valve part.

Therefore, in order to effectively utilize the calorific value of the heating element installed in the valve seat and to reduce the amount of heat radiated to the housing side, the present invention is designed to provide a means for attaching and fixing the heating element in the valve seat and the valve seat to the housing. By improving this, the aim is to raise the temperature of the valve part (valve seat, valve body) in a short time with the power consumption of a small heating element.

[Structure of the idea]

In order to achieve the above object, the present invention has a flow control valve, in which a heating element is inserted into the valve seat so that the generated heat acts on the valve seat and the valve body, and the housing of the flow control valve and the temperature conduction The valve seat is fixed to the housing by interposing a heat shielding material made of a conductive material with low temperature conductivity between the valve seat made of a material having a high thermal conductivity, and the valve seat is also provided with the following configuration.

That is, the heating element is provided within the valve seat, one electrode of the heating element is fixed in contact with the valve seat, and the heat shield is made of a conductive ring.

[Effect]

As a result, when the heating element inserted into the valve seat is energized,
The heat generated by the heating element acts on the valve seat and the valve body, making it possible to thaw the ice on the valve portion.

Further, since the heat shield material is interposed between the housing and the valve seat, the temperature of the valve seat can be sufficiently raised.

In addition, since one electrode of the heating element is fixed in contact with the valve seat, the heat of the heating element is directly transmitted to the valve seat, and the valve seat can be used as a current-carrying member, so that the current passing through the valve seat is Furthermore, since it is possible to flow to the housing side through the conductive heat shielding material, the current-carrying structure can be simplified and the structure can be made compact.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, 1 is a housing of a valve part, 1a is an inlet port, and 1b is an outlet port.

Reference numeral 2 denotes a ring-shaped valve seat made of copper or a copper-based alloy and having a U-shaped cross section. The valve seat 2 is fixed via a ring 6 made of stainless steel fixed in the housing 1, and a heating element is mounted inside the valve seat 2. 3 is built-in.

Further, the electrode 3a on one side of the heating element 3 is in direct contact with the valve seat 2 so that the heat generated by the heating element 3 acts directly on the valve seat 2, thereby ensuring heat conduction and electrical connection to the negative electrode (ground) on the housing 1 side. is ensured.

A ring-shaped recess 1 is provided on the valve seat fixing surface inside the housing 1.
c is provided to make the fixing contact area between the valve seat 2 and the housing 1 as small as possible, and to reduce the amount of heat generated by the heating element 3 that is conducted to the housing 1 side.

Reference numeral 4 denotes a valve body, which has a dimensional relationship that allows it to slide on the inner diameter side of the valve seat 2, and a shaft for transmitting the thrust of an actuator 16 such as a solenoid or step motor that is in contact with the recess 4b of the valve body 4. 5 controls the position of the valve body 4, and the valve seat 2
The opening area between the valve body 4 and the valve body 4 is controlled to control the flow rate.

Further, the valve body 4 and the bellows 7 made of a non-metallic material are fixed together by a fixing nut 8, and the pressure upstream (front side) of the valve body is introduced into the bellows 7 through a hole 4c provided in the valve body 4.
The pressures before and after the valve body 4 are balanced.

A return spring 9 is fixed inside the bellows 7, and a stopper 10 stops the valve body 4 at the fully open position.

Further, the position of the stopper 10 can be adjusted using the threaded portion 11a of the plate 11, and is fixed (locked) with a nut 12.

13 is a plate for fixing the bellows 7, and at the same time has the effect of a plate for sealing inside the bellows 7.

Next, the fixing and electrical connection of the heating element 3, such as a positive temperature coefficient thermistor, provided in the recess 2a in the valve seat 2 will be described.

The electrode 3a on one side of the heating element 3 is in direct contact with the valve seat 2, and is connected to the negative pole of the power source (not shown) through the valve seat 2, the ring 6, and the housing 1, and the electrode 3b on the other side of the heating element 3 is connected to the terminal 14. Connected to the positive pole of the power supply through.

Note that the contact pressure of the terminal 14 with the electrode 3b of the heating element 3 is ensured by the spring pressure of the seat spring 18, and an electrical connection is obtained.

17 is a receiving plate for the wall spring 18; the heating element 3, the terminal 14, the seat spring 18, and the plate 17 are housed in a case 15 made of an electrically and thermally insulating material, such as a resin material; The fixed lead wire 19 is for supplying electricity to the heating element 3 from the outside, and the reference numeral 20 is a grommet, which is a part for extending the lead wire 19 to the outside of the housing 1.

In the above configuration, the heat generated from the heating element 3 can be effectively conducted to the valve seat 2 by reducing the radiation of the heat toward the housing 1 made of aluminum alloy by the following configuration.

(1) The electrode part 3a of the heating element 3 is brought into direct contact with the recess 2a in the valve seat 2 made of copper or a copper-based alloy with high temperature conductivity to ensure electrical and thermal conduction. 3 is effectively conducted to the valve seat 2.

(2) The valve seat 2 is fixed in the housing 1 through a ring 6 made of stainless steel.
A configuration in which a recess 1c is provided on the fixed surface between the housing 1 and the ring 6 to reduce the contact area with the ring 6 allows the heat generated by the heating element 3 to be transmitted to the valve seat 2, and the heat acting on the valve seat 2 to be transferred to the aluminum This is a means for preventing heat radiation to the housing 1 side made of a newum alloy as much as possible.

The valve seat 2 is made of copper or a copper alloy with good thermal conductivity, and
The housing 1 made of an aluminum alloy has the same good thermal conductivity as the valve seat 2, and when the valve seat 2 is fixed in direct contact with the housing 1, the amount of heat transmitted to the valve seat 2 is radiated to the housing 1 side. However, the time required for the valve seat 2 to reach the target temperature is significantly delayed.

Therefore, by interposing the ring 6 made of aluminum of the present invention and a stainless steel alloy with a comparative waist temperature conductivity of about 1116 between the housing 1 and the valve seat 2, the temperature of the valve increases due to the heat generated by the heating element 3. It is possible to prevent the heat of the seat 2 from radiating toward the housing 1 side, and it is possible to effectively transfer the heat generated by the heating element 3 to the valve seat 2-\.

Furthermore, by providing the recess 1C on the ring 6 fixing surface of the housing 1, the contact area between the housing 1 and the ring 6 can be reduced, and heat radiation to the housing 1 can be further prevented.

Incidentally, the temperature conductivity is expressed by the following formula.

Temperature conductivity - 18543 - heat) x (specific gravity) The efficiencies of the above-mentioned embodiments are listed as follows.

1 Generally, the housing 1 constituting the valve is made of an aluminum alloy material, which has high thermal conductivity and a large amount of heat radiation, which is disadvantageous for the purpose of raising the temperature of only the valve portion by the heat generated by the heating element 3.

Therefore, between the housing 2 of the present invention and the valve seat 2 made of a material with high temperature conductivity, a ring 6 made of a material with low temperature conductivity, such as a non-metal such as a stainless steel alloy or a resin material among metals, is interposed. By fixing the valve seat 2 to the housing 1 in this manner, the heat generated by the heating element 3 can be effectively transmitted to the valve seat 2.

2. Store the heating element 3 in the recess 2a in the valve seat 2, and
The electrode 3a on one side of the electrode 3a is brought into contact with the recess 2a of the valve seat 2 to improve the efficiency of transmitting the amount of heat generated by the heating element 3 to the valve seat 2. You can get pressure and get electrical connection.

3. Furthermore, the storage case 15 for the heating element 3 in the valve seat 2 is made of a resin material, and electrical and thermal insulation of the heating element 3 and the terminal 14 can be obtained.As explained above, the structure of the present invention By doing so, the amount of heat generated by the heating element 3 housed in the valve seat 2 can be effectively transferred to the valve seat 2.
It is possible to transmit the effect to release the freeze lock of the valve part at low temperatures in a short time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of essential parts showing an embodiment of the control valve of the present invention;
FIG. 2 is a longitudinal sectional view showing the configuration of the valve seat 2 portion of the control valve shown in FIG. 1. 1...Housing, 1a...Inlet port, 1b...Outlet port, 1c
. . . Concavity forming a void, 2 . . Valve seat, 3 . . . Heating element, 3a, 3b . . . Electrode, 4・Valve body, 5...Shaft, 6
...Ring as a heat shield, 16...
Actuator as a driving part.

Claims (1)

[Scope of utility model registration request] A housing 1 having an inlet port la and an outlet port 1b, a valve seat 2 provided in the housing 1
, provided so as to be able to abut or separate from the valve seat 2, from the inlet port 1a to the outlet port 1.
a valve body 4 that controls the amount of fluid flowing into the housing 1; a shaft 5 joined to the valve body 4; and a drive unit 16 that is connected to the shaft 5 and slides the shaft 5 within the housing 1.
A flow control valve comprising: a heating element 3 inserted into the valve seat 2 so that generated heat acts on the valve seat 2 and the valve body 4; The valve seat 2 is fixed to the housing 1 with a heat shield made of a conductive material having low temperature conductivity interposed between the valve seat 2 and the valve seat 2. One electrode 3a of the heating element 3 is provided in the seat 2 and is fixed in contact with the valve seat 2, and the heat shield is inserted between the housing 1 and the valve seat 2. 1. A flow control valve characterized in that the ring 6 has a flat ring.