JPS6141019Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature detection switching valve that detects temperature and switches the pressure signal system at a certain set temperature.

Generally, the most versatile temperature detection switching valve is one that switches from one input port to one of two output ports.
However, if there are two input signal pressure sources and it is necessary to supply pressure to each of the two actuators, and if you want to switch the supply at a certain temperature, you can use two temperature detection switching valves to supply pressure to each of the two actuators. There are many ways to handle input signal pressure. However, due to restrictions on mounting locations, there is a strong desire for a single switching valve to have this function.

The title of the present invention was created in view of the above-mentioned request, and the purpose is to provide a temperature detection switching valve that reduces the number of parts by consolidating two temperature detection switching valves into one switching valve. .

In order to achieve this purpose, the present invention
A switching valve main body having a cylindrical inner chamber, a valve seat portion that moves within the switching valve main body, and a cylindrical valve seat mounted around the valve seat portion with a constant gap from the wall surface of the switching valve main body. A valve, an annular seal portion formed at both ends of the outer periphery of the valve and abutting the inner wall surface of the switching valve body, and thermally expands when a set temperature is exceeded to move the valve seat portion and the valve in a predetermined direction. a thermal expansion member that moves in the predetermined direction relative to the valve seat in the switching valve main body that is partitioned by the valve and the valve seat; a communication hole provided in the valve seat to communicate with a second compartment on the opposite side; and a first fluid passage provided at a position that always communicates with the first compartment regardless of movement of the valve. , a second fluid passage provided in a position that communicates with a third compartment formed between the valve and the inner wall surface of the switching valve main body regardless of movement of the valve; a third fluid passage provided at a position that communicates with the first compartment when the temperature does not exceed the predetermined temperature and communicates with the third compartment when the temperature is moved in the predetermined direction; A fourth fluid passage is provided at a position that communicates with the third compartment and communicates with the second compartment when moving in the predetermined direction.

Hereinafter, details of the present invention will be explained using examples shown in the drawings.

FIG. 1 is a vertical cross-sectional view showing the temperature detection switching valve according to the present invention in a low temperature state, and FIG. 2 is a partial longitudinal cross-sectional view showing the temperature detection switching valve in a high temperature state.
In the figure, reference numeral 1 denotes a switching valve main body valve, and a first pipe member 3 having a first fluid passage 3a is connected to the upper end of the switching valve main body 1 via an O-ring 2. At the same time, a sealing film 4 is provided at the lower end.
The temperature sensing section 5 is attached via the. A thermal expansion member 6 is accommodated in the temperature sensing portion 5, and an actuating rubber 7, a rubber piston 8, and a Teflon sheet 9 are placed on top of the thermal expansion member 6 via the seal film 4.
and piston 10 are arranged in this order. Further, a valve seat portion 11 is attached to the upper end of the piston 10, and the valve seat portion 11 includes:
A communication hole 11a is provided to communicate a first compartment 13 and a second compartment 14, which are divided by a valve 12 mounted on the outer periphery of the valve seat 11. Further, upper and lower annular seal portions 1 are provided at upper and lower end positions of the outer periphery of the valve 12 to press against the inner wall surface of the switching valve body 1.
2a and 12b are formed, and a third compartment 15 is formed as an inner wall surface of the valve 12 and the switching valve main body 1.
is formed. Further, the valve 12 further includes:
The lower annular seal portions 12a and 12b are configured to move up and down within the switching valve main body 1 while being in pressure contact with the inner wall surface of the switching valve main body 1. Note that 16 is a valve carrier disposed on the inner periphery of the valve 12, and the valve carrier 1
A spring 17 is interposed between the bottom portion 16a of the ring 6 and the bottom surface portion 3b of the first ring 3 to bias the valve 12 downward in the figure.

Further, the first fluid passage 3a is always in communication with the first compartment 13. Furthermore, a second fluid passage 20a is provided on the left side of the switching valve main body 1.
A third pipe member 18 having a third fluid passage 18a and a fourth pipe member 20 having a fourth fluid passage 19a are connected to the right side of the switching valve body 1. pipe members 19 are connected to each other. The second fluid passage 20a is always in communication with the third compartment 15. On the other hand, the third fluid passage 18a and the fourth fluid passage 19a are upper and lower annular seal portions 12a, 1 located at the upper and lower ends of the valve 12.
2b, and the fluid passage 18a shown in FIG. 3 communicates with the first compartment 13 when the temperature is low (see FIG. 1) and communicates with the first compartment 13 when the temperature is high (see FIG. 2). ), and the fourth fluid passage 19a is configured to communicate with the third compartment 15 when the temperature is low (see FIG. 1) and communicate with the third compartment 15 when the temperature is high (see FIG. 2). ) is configured to communicate with the second compartment 14.

Next, the action will be explained. At low temperatures, the signal negative pressure introduced into the second fluid passage 20a communicates with the fourth fluid passage 19a through the third compartment 15, as shown in FIG. Further, the atmospheric pressure guided into the first fluid passage 3a is communicated with the third fluid passage 8a which is open to the first compartment 13. Here,
a second fluid passage 20a and a fourth fluid passage 19a;
Two independent pressure system paths, the first fluid passage 3a and the third fluid passage 18a, are established.

On the other hand, at high temperatures, the thermal expansion member 6 expands and pushes up the piston 10 via the actuation rubber 7, the rubber piston 8, and the Teflon sheet 9, so that the valve 12 overcomes the biasing force of the spring 17 and rises. As shown in FIG. 2, the upper annular seal part 12a of the valve 12 passes through the third fluid passage 18a and the lower annular seal part 12b passes through the fourth fluid passage 19a, thereby opening the third compartment. 1
5 communicates with the third fluid passage 18a, while the communication hole 11a provided in the valve seat portion 11
a second compartment in communication with the first compartment 13 via the
The compartment 14 will communicate with the fourth fluid passage 19a. Here, two independent pressure systems, the second fluid passage 20a and the third fluid passage 18a, and the first fluid passage 3a and the fourth fluid passage 19a, are established.

As explained above, the temperature detection switching valve according to the present invention has the first to fourth fluid passages, and when the temperature is below the set temperature, the first fluid passage and the third
The fluid passage, the second fluid passage, and the fourth fluid passage are in communication with each other, and when the set temperature is exceeded, the thermal expansion force of the thermal expansion member overcomes the biasing force of the spring, thereby operating the valve. Since the first fluid passage is configured to communicate with the fourth fluid passage and the second fluid passage and the third fluid passage, it is possible for one switching valve to have the functions of two switching valves, Therefore, there is an effect that the number of parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the temperature detection switching valve according to the present invention in a low temperature state, and FIG. 2 is a partial longitudinal cross-sectional view showing the temperature detection switching valve in a high temperature state. 1... Switching valve body, 3a... First fluid passage,
6... thermal expansion member, 12... valve, 17... spring, 20a... second fluid passage, 18a... third fluid passage, 19a... fourth fluid passage.

Claims (1)

[Scope of utility model registration request] A switching valve main body having a cylindrical inner chamber, a valve seat portion that moves within the switching valve main body, and a cylindrical shape mounted around the valve seat portion with a constant gap from the inner wall surface of the switching valve main body. a valve, an annular seal portion formed at both ends of the outer periphery of the valve and abutting against the inner wall surface of the switching valve body; and an annular seal portion that thermally expands when a set temperature is exceeded to move the valve seat portion and the valve in a predetermined direction. a thermal expansion member to be moved; a first compartment in the switching valve main body that is defined by the valve and the valve seat; and a first compartment on the side that moves in the predetermined direction with respect to the valve seat; and a first fluid passage provided in a position that always communicates with the first compartment regardless of movement of the valve. a second fluid passage provided in a position that always communicates with a third compartment formed between the valve and the inner wall surface of the switching valve main body regardless of movement of the valve; a third fluid passage provided in a position that communicates with the first compartment when the temperature does not exceed the predetermined temperature and communicates with the third compartment when the temperature is moved in the predetermined direction; and when the temperature of the valve does not exceed the set temperature. A temperature detection switching valve comprising: a fourth fluid passage provided in a position that communicates with the third compartment and communicates with the second compartment when moving in the predetermined direction.