JPS6262071A - Device for controlling temperature of poppet valve - Google Patents

Abstract

PURPOSE:To easily adjust the temperature of a poppet valve by sealing a refrigerant in a hollow portion formed in the interior of the poppet valve and connecting a refrigerant supply pipe to the hollow portion through a valve to vary the quantity of a refrigerant in the hollow chamber. CONSTITUTION:A hollow portion 12 is formed in the interior of a poppet valve 11. A fixed quantity of a refrigerant is sealed in the hollow portion. On the other hand, a cooling device 16 is disposed on the outer periphery of a valve stem portion, whereby heat of a valve head portion 11a is collected by the cooling device 16 through the refrigerant in the hollow portion 12. As a refrigerant supply and discharge pipe 13 having a solenoid valve 15 is connected to the hollow portion 12, the solenoid vale 15 is controlled to open and close according to a temperature condition of the poppet valve 11 by a control device 20, so that the quantity of sealed-in refrigerant is varied to adjust the temperature of the poppet valve 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement in a temperature control device for a poppet valve used in an internal combustion engine or the like.

[Conventional technology]

Poppet valves used in internal combustion chambers, industrial gas compressors, plant piping systems, etc. are often equipped with a cooling system depending on the conditions of use, and are often used in a cooled state.

For example, in a poppet type valve used in a large diesel engine, as shown in Fig. 3, a hollow part 2 is formed in the valve head part 1a and the valve stem part 1b of the poppet type valve 1, and a coolant 3 is poured into the hollow part 2. It is sealed and cooled via a secondary cooler (not shown) provided on the outer periphery of the upper end of the valve stem portion 1b.

The temperature of the poppet valve 1 is controlled by changing the water level, temperature, cooling area, etc. of the cooling water of the secondary cooler.

[Problem that the invention seeks to solve]

However, even if the water outlet and temperature of the cooling water are changed using such a secondary cooler, the cooling liquid 3 sealed in the hollow part 2 of the poppet valve 1 is heated by combustion gas, etc., turns into steam, and generates heat. On the other hand, in the secondary cooler, the cooling water always remains in a liquid phase and absorbs a large amount of heat, making it impossible to significantly change the temperature of the poppet valve 1.

That is, this is because, in terms of heat transfer conditions, the boundary conditions such as the heat transfer coefficient of the wall surface on the side of the secondary cooler are larger than the boundary conditions such as the heat transfer coefficient of the wall surface on the side of the hollow part 2 of the poppet type valve 1.

This invention was made in view of the prior art, and allows the temperature of the poppet valve to be controlled over a wide range, has good responsiveness,
It is an object of the present invention to provide a poppet-type valve temperature control device that can be easily controlled.

[A last resort to solve the problem]

In order to solve the above problems, this invention attempts to change the boundary conditions for heat transfer on the hollow side of the poppet valve, contrary to the conventional method, by introducing a cooling medium into the poppet valve. A controller that forms a hollow part in which a cooling medium is supplied and discharges a cold IJl medium through an on-off valve, and a supply/discharge pipe that can supply and discharge a cold IJl medium through an on-off valve, and controls the amount of cooling medium in the hollow part by opening and closing this on-off valve. It is characterized by having the following.

ξ action] Till of the cooling medium introduced into the hollow part of the poppet type valve
is adjusted by controlling the opening and closing of on-off valves installed in the supply and exhaust pipes, and by utilizing the fact that the cooling medium changes into a gas phase and a liquid phase when a zero-heat load is applied to a poppet-type valve, it is possible to improve heat transfer. The cooling temperature is adjusted by changing the boundary conditions.

(Example) Hereinafter, an example of a droplet according to the present invention will be explained in detail based on the drawings.

In the temperature control device for poppet type valves 1 to 1 of the present invention, as shown in FIG.
1a and the valve stem part 11b are formed with a hollow part 12 for storing the coolant C, a supply/discharge pipe 13 for the coolant C is inserted from the upper end of the valve stem part 11b, and is sealed with a seal ring 14. At the same time, it is installed so that it communicates with the hollow part 12 [
Being beaten. A throttle-type solenoid valve 15 is attached to the middle of the outside portion of the poppet-type valve 11 of the supply/discharge pipe 13, and is connected to a cooling liquid supply device (not shown) via the solenoid valve 15.

Further, in order to secondarily cool the cooling liquid C in the hollow part 12 of the poppet-shaped valve 11, a cylindrical cooler 16 is arranged on the outer periphery of the upper end of the valve stem part 11b, and is sealed with seal rings 17 at both ends. It is attached and connected to a secondary cooling water supply device (not shown).

Furthermore, a temperature controller is provided to detect the temperature of the cooling liquid C in the hollow part 12 in order to control the temperature of the poppet valve 11.
18 and a pressure sensor 9 are provided, and respective detection signals t and po are input to the controller 20.

In addition, a valve temperature sensor 21 is embedded in the valve head portion 11a to detect the thermal load on the poppet type valve 11, and the control 2TI2H
The detection signal tV is input to the controller 20, and the controller 20
The fuel flow rate signal is 1 rotation speed times N.

It is electrically connected to each sensor IL to receive the exhaust gas temperature signal H, and outputs an opening/closing operation signal (2) to the solenoid valve 15 based on these signals.

Poppet type valve temperature control device 10 configured as above
Now, the temperature of the poppet valve 11 is controlled by changing the extent of the cooling liquid C supplied to and discharged from the hollow portion 12 of the poppet valve 11 while keeping the state of the secondary cooling water in the cooler 16 substantially constant.

Therefore, the relationship between the amount of coolant C put into the hollow part 12 of the valve 11 and the heat load will be explained.

Broadly speaking, the suspension of the coolant C in the hollow portion 12 of the poppet valve 11 can be divided into three states, as shown in FIGS. 2(a) to 2(C).

In other words, a comparative inner g
The state in which the cooling 1'J)'I liquid C is poured corresponds to FIG. The part corresponding to the upper end of the upper valve stem part 11b is heated with saturated steam S (gas phase) of cold NI liquid C.
is located at the same time as the gas-liquid phase W of the cooling liquid C exists in the intermediate part, and is used for cooling when the thermal load of the valve 11 is large. It is cooled by the sensible heat of the phase cooling liquid C and the latent heat due to evaporation.

In addition, under normal heat load conditions, as shown in FIG. 2(b), a small amount of coolant C exists in the portion of the hollow portion 12 corresponding to the back valve head portion 11a, and dryout occurs due to evaporation. In the part corresponding to the uppermost valve stem part 11b, the saturated steam S is condensed by the cooler 16, and by maintaining such a state,
The poppet valve 11 is cooled to a state close to the ideal state.

Furthermore, if the heat load is very small and cooling is hardly required, the hollow part 1
There is no (liquid phase) cooling liquid C in 2, and only saturated steam S is in a dry-out state, and heat transfer is performed using a poppet valve 11.
This is done by heat conduction through the metal bodies that make up the structure and by the heat carried by the saturated steam S.

Each of these states occurs based on the fact that the heat transfer coefficient of the wall surface of the hollow portion 12 changes greatly depending on whether the coolant C is in a liquid phase or a gas phase (saturated steam S). be.

In addition, there are some changes in each state depending on the state of the cooler 16 to which the secondary cooling water is supplied, but as mentioned above, it can be considered to be almost constant, so depending on m of the cooling liquid C, It can be seen that a wide range of temperature control with excellent responsiveness is possible.

Next, temperature control of the poppet valve will be specifically explained.

The temperature control of this poppet type valve 11 is performed by
Based on the detection signal t6 of the valve temperature sensor 21 embedded in the valve head portion 11a, the controller 2o compares the detected temperature with a target temperature stored and set in advance in the controller 2o, and if the detected temperature is higher than the target temperature, the solenoid valve is A valve opening operation signal (2) is output to the valve 15 to supply the cooling liquid C to perform cooling, for example, in a high cooling state as shown in FIG. 2(a).

On the other hand, if the detected temperature is lower than the target temperature, the controller 20 outputs the valve opening operation signal V to the 'Fi magnetic valve 15 to release the cooling HC in the hollow part 12, as shown in FIG. Cooling is suppressed as shown in b) or (C).

In addition, in this poppet-type valve temperature control device 1o, when the pressure in the hollow part 12 becomes high, a valve opening operation signal (■) is output from the control device 2o to the solenoid valve 15 based on the detection signal @pc of the pressure sensor 19. , the hollow portion 12 is kept open, and in this case, piping is provided so that the cooling liquid C or steam can be released and recovered.

Next, temperature control performed without detecting the temperature of the valve head portion 11a of the poppet valve 11 will be described.

For example, in the case of a diesel engine, the heat load on the poppet valve 11 is determined by the fuel flow ff1L and the rotation speed N.

These detection signals are input to the controller 20 because they can be determined by the exhaust gas temperature H.

The temperature of the poppet valve 11 is determined by calculation based on "N, )".

Then, the temperature of the poppet valve 11 determined by this calculation and the preset value 8! The controller 20 compares the temperature with the above case and outputs a valve opening operation signal V to the 1iliI-like solenoid valve 15 to perform temperature control.

In addition, as a driving device for such a poppet type valve, the cooling fluid supply/discharge pipe 13 is attached to the side of the valve stem portion 11b,
Moreover, if the valve can be adapted to reciprocating motion, a conventional drive device can be used as is, and in the case of the configuration shown in the example, a hydraulic piston is attached to the middle part of the valve stem 11b to perform reciprocating motion. It may be made to move.

〔Effect of the invention〕

As specifically explained above in conjunction with the embodiments, according to the present invention, a hollow portion is formed in the poppet type valve, and a cooling medium supply/discharge pipe is connected to the hollow portion through an on-off valve so as to communicate with the poppet-type valve. Since a controller is provided to open and close the valve, the temperature of the poppet valve can be controlled simply by controlling the supply and discharge of the cooling medium inside the hollow part, compared to the case where the secondary cooler side is controlled. is easy and has good responsiveness.

Furthermore, the temperature can be controlled over a wide range from non-cooling to high-cooling states by controlling the cooling medium in the hollow part.

Furthermore, compared to the conventional method of controlling the temperature of the primary cooling water sealed in the hollow part by controlling the state of the secondary cooling water, it is possible to control the cooling medium group in the hollow part corresponding to the secondary cooling water. Therefore, the equipment for the entire control system is simple and low cost, and the control system is easy to use.
High accuracy.

Therefore, the temperature of the poppet type valve can be maintained at the optimum temperature or within a predetermined temperature range against fluctuations in heat load.
Since the poppet valve's low-temperature corrosion resistance, high-temperature corrosion resistance, and high-temperature strength can be increased, its life can be significantly extended.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the temperature control device for a poppet type valve of the present invention, FIGS. 2(a) to (C) are illustrations of the cooling state by the mother of the cooling medium, and FIG. 3 1 is a cross-sectional view of a conventional poppet valve. DESCRIPTION OF SYMBOLS 10... Temperature control device of a poppet type valve, 11... Poppet type valve, 12... Hollow part, 13... Supply/discharge pipe, 1
5... Solenoid valve, 16... Cooler 1, 18... Temperature sensor, 20... Controller, C... Coolant. Applicant Ishikawajima-Harima Heavy Industries Co., Ltd. Agent Toru Sakamoto (1 idiot) 8 C 11: ho1 mat, offiyP1B: ugh;
2: Nata gong 19: J Kasenbu 13: [To t t 7 2o: Bu 1111 a
J Container 15 is stored C: Kami Soku Nu 16: Cooler

Claims (1)

[Claims] forming a hollow part into which the cooling medium is introduced into the poppet-shaped valve;
A supply/discharge pipe capable of supplying and discharging a cooling medium through an on-off valve is provided in this hollow part, and a controller is provided for opening and closing this on-off valve to control the amount of cooling medium in the hollow part. Poppet type valve temperature control device.