JP6356841B2 - Switching valve and usage of switching valve - Google Patents

Description

  The present invention provides a switching valve in which a valve main body has three outflow inlets, and the valve body slides in the valve main body according to the temperature of an external fluid and selectively closes one of the two outflow inlets. The present invention relates to a method for using a switching valve.

  According to Patent Document 1, a three-way valve using a wax element has three outflow inlets in which a valve body is arranged in a T shape, and two outflow inlets that flow in and out by opposing valve bodies and valve seats. These valves are arranged on the same straight line, and these valve bodies are displaced in accordance with the temperature in the valve body to selectively close either one of the two outlets, and the wax element body is placed inside the valve body. And a wax element for detecting the temperature is enclosed in the inside of the wax element body, the wax element expanding and contracting according to the temperature, and a piston moving forward and backward by the expansion and contraction of the wax, And a switching valve that opens and closes the outflow port by moving the valve element that is urged by a return spring by the forward and backward movement of the piston.

  According to Patent Document 2, a switching valve in which a temperature detection unit is exposed to the outside of the valve body is disclosed. One valve body is spherical, has two valve seats, and the flow of the fluid from the other two passages is switched by the movement of the valve body with respect to the passage located at the center of the three passages. ing.

Japanese Patent Laid-Open No. 11-094101 Japanese Utility Model Publication No. 48-013824

  Therefore, the temperature regulating valve of Patent Documents 1 and 2 requires a valve seat member.

  The present invention provides a three-way valve that has a single valve body and a valve body that functions as a valve seat, can switch between two fluids according to the temperature of an external object, and can switch the flow path of one fluid. The purpose is to provide.

The present invention is a switching valve in which a wax element body is fixed inside a valve body, and a temperature detection part in the wax element body is arranged outside the valve body. The wax element body includes a temperature detection unit in which wax that expands and contracts according to the detected temperature outside the valve body, a fixing unit that fixes the wax element body inside the valve body, The actuator part fixed inside the fixed part is integrally formed, and has a piston that slides by the pressure accompanying the expansion of the wax inside the actuator part, and the inside of the valve body is slid by being pressed by the end face of the piston. One moving cylindrical valve body and a return spring that always presses the valve body and the piston are arranged, and the three outflow inlets are located in the area where the valve body slides. Two outflow inlets that are located at the same distance as the length of the valve body in the sliding direction, and located outside the area where the valve body slides and on the side away from the temperature detection unit with respect to the two outflow inlets The valve body that selectively closes one of the two outflow inlets is a cylindrical shape that is concentric with the valve body that houses the return spring on the end face side away from the temperature detection unit. recess is formed, and wherein the communicating hole passing through the other end face of the bottom or al valve body cylindrical recess is plural formed at intervals in the circumferential direction.

Further, in the switching valve, a portion where the end surface of the piston presses the valve body is located inside the valve body, and the piston slides inside the cylindrical piston housing cylinder formed to protrude from the actuator portion toward the valve body side. The piston housing cylinder is inserted into a cylindrical recess formed concentrically with the valve body on the end surface side of the valve body on the temperature detection unit side, and the outer side of the cylindrical recess of the valve body A plurality of communication holes penetrating from the end surface on the temperature detection unit side to the other end surface and the bottom surface of the other cylindrical recess are formed at intervals in the circumferential direction.

  In the switching valve, in the three outflow inlets of the valve body, the two outflow inlets are fluid inflow portions, and the fluid selectively flowing in from one outflow inlet flows out from the other outflow inlet or the other It is preferable that the outflow inlet is a fluid inflow portion, and the fluid selectively flows out from either one of the two outflow inlets.

  The switching valve can be attached to the external object by using an attachment member for attaching the valve body to the external object.

  According to the present invention, the valve body has one valve body and the valve body functions as a valve seat, two fluids can be switched according to the temperature of an external object, and the flow path of one fluid can be switched. A three-way valve can be provided.

It is a longitudinal cross-sectional view of the valve body of the switching valve at the time of wax contraction, showing the first embodiment of the present invention. It is a longitudinal cross-sectional view of the valve main body of the switching valve when wax expand | swells from the state of FIG. It is a longitudinal cross-sectional view of the valve main body of the switching valve when wax expand | swells further from the state of FIG. An attachment board member is shown, (a) is a top view, (b) is a side view. It is a longitudinal cross-sectional view of the valve body of the switching valve at the time of wax contraction, showing the second embodiment of the present invention.

  A first embodiment of the present invention will be described below with reference to FIGS.

   As shown in FIG. 1, the valve body 1 of the switching valve is transparent or translucent so that the inside can be seen through, the cross section of the portion other than the outflow / inflow passage port is rectangular, and the casing 2 is hollow with a circular cross section. One circular pipe part (used as the outlet channel port 3 in the present embodiment) protrudes from one end face, and two circular pipe parts (this example) on one side near the outlet channel port 3 In the form, it is used as the inlet channel ports 4 and 5). The outlet channel port 3 communicates with the casing 2 through a communication hole a6 that passes through the wall of the casing 2, and the inlet channel ports 4 and 5 communicate with the casing 2 through communication holes a7 and 8 that respectively penetrate the wall of the casing 2. ing.

  A valve body 9 is accommodated in the valve body 1. The valve body 9 is a cylindrical member having substantially the same diameter as the hollow portion of the casing 2 of the valve body 1 and is slidable within the valve body 1. Two annular grooves are formed on the outer peripheral surface of the valve body 9 at intervals in the axial direction, and seal rings a10 and 11 are mounted in these grooves, respectively. The outer peripheral surface of the valve body 9 and the valve body 1 Sealing with the inner peripheral surface is performed.

  A cylindrical recess a12 is formed concentrically with the valve body 9 on the end surface of the valve body 9 on the outlet flow passage port 3 side, and a communication hole b13 that penetrates from the bottom surface of the cylindrical recess a12 to the other end surface of the valve body 9. Are formed at intervals in the circumferential direction.

  The wax element body 15 includes a head portion 15a, a body portion 15b, and a wax element 14, and the wax element body 15 accommodates wax that expands and contracts according to temperature in a part of the body portion 15b. The piston 16 is moved forward and backward by the pressure associated with the expansion and contraction, and the end surface of the piston 16 contacts and presses the end surface of the valve body 9.

  The head 15 a of the wax element body 15 is disposed in the casing 2 of the valve body 1, and the valve body 1 is sealed by a seal ring b 17 mounted in an annular groove formed on the inner peripheral surface of the casing 2 of the valve body 1. And the wax element body 15 are fixed with respect to the valve body 1. The body portion 15b of the wax element body 15 is inserted through a through hole 19 formed in an attachment plate member 18 attached to the opening end surface of the valve body 1 and protrudes from the valve body 1 to the outside and exposed. Wax is accommodated in approximately half of the front end side of the body portion 15b of the wax element body 15, and constitutes a temperature detection unit that detects the external temperature.

  A cylindrical convex portion is formed at the center of the end face of the valve body 1 inside the casing 2 on the outlet flow passage port 3 side, and one end of the return spring 20 is inserted into the outer periphery of the cylindrical convex portion. Is inserted into the cylindrical recess a12 of the valve body 9, and is always mounted in a compressed state between the end surface of the valve body 1 on the outlet channel 3 side inside the casing 2 and the bottom surface of the cylindrical recess a12 of the valve body 9. Has been. The valve element 9 is urged toward the wax element body 15 by the return spring 20 to press the piston.

  An attachment plate member 18 (see FIG. 4) is attached to the opening end surface of the valve body 1 opposite to the outlet flow passage port 3. The attachment plate member 18 is a member for attaching the valve body 1 to an external object. The mounting plate member 18 has a pair of side plate portions 18b projecting outward at right angles from two opposing sides of a square fixing plate portion 18a having a through hole 19 in the center, and further mounting plate portion 18c from the tip of the side plate portion 18b. Is bent at right angles and extends outward, and has a through-hole 21 for attaching to an external object on the attachment plate portion 18c. The mounting plate member 18 has a fixed plate portion 18 a disposed on the opening end face of the valve body 1, and is fixed to the valve body 1 with bolts 22.

  The operation of the switching valve will be described below with reference to FIGS.

  In the switching valve, the mounting plate member 18 is attached to an external object (not shown), and the front end surface of the body 15b of the wax element body 15 is in contact with the external object.

  The state of FIG. 1 shows a case where the body 15b of the wax element body 15 detects the temperature of the external object and the wax is in a contracted state.

  In this case, the valve body 9 closes the communication hole a <b> 8 communicating with the inlet channel port 5 far from the outlet channel port 3 of the valve body 1. Therefore, the fluid A flows from the inlet channel port 4 closer to the outlet channel port 3, flows into the valve body 1, and flows out from the outlet channel port 3.

  Next, when the temperature of the external object rises and the body portion 15b of the wax element body 15 detects the temperature of the external object, the wax expands and the piston 16 moves forward to resist the biasing force of the return spring 20. The body 9 is moved to move from the state of FIG. 1 to the state of FIG. 2 and further to the state of FIG.

  The state of FIG. 3 shows a case where the body 15b of the wax element body 15 detects the temperature of the external object and the wax is in an expanded state.

In this case, the valve body 9 closes the communication hole a7 that communicates with the inlet channel port 4 closer to the outlet channel port 3 of the valve body 1. Therefore, the fluid B flows from the inlet channel port 5 far from the outlet channel port 3 and flows into the valve body 1 and flows out from the outlet channel port 3 through the communication hole b13 of the valve body 9.
Thus, the inner peripheral surface of the casing 2 of the valve body 1 has the function of a valve seat, and is a switching valve that does not require a valve seat member as a separate member.

  As described above, one of the two different types of fluids A and B can be selectively discharged from the outlet channel port 3 according to the temperature of the external object. Therefore, the switching valve is attached to the cylinder block wall portion of a general-purpose engine such as a small generator, and when the temperature of the cylinder block wall portion is low, fluid A (gasoline) is caused to flow out from the outlet passage port 3 and gasoline is used as fuel. However, when the temperature of the cylinder block wall is high, the fluid B (ethanol) can be allowed to flow out of the outlet channel port 3 and ethanol can be used as fuel.

  FIG. 5 shows a second embodiment of the present invention. Hereinafter, differences from the switching valve of the above embodiment will be described.

  In the present embodiment, the end of the valve body 1 in which the outlet channel port 3 is formed in the above embodiment is closed, and the circular pipe part (used as the outlet channel port 3 in this embodiment) is a valve. The example which protrudes from the casing 2 outer peripheral surface on the opposite side to the inlet channel ports 4 and 5 in the casing 2 of the main body 1 is shown, and the outlet channel port 3 communicates with the inside of the casing 2 through a communication hole a6 penetrating the casing 2 wall. ing.

A cylindrical recess b23 is formed concentrically with the valve body 9 on the end surface on the body 15 side of the valve body 9, and a piston housing cylinder 24 that protrudes from the wax element 14 and accommodates the piston 16 in the cylindrical recess b23. Is inserted, and the end surface of the piston 16 is in contact with the bottom surface of the cylindrical recess b23. An annular groove is formed in the inner peripheral surface of the cylindrical recess b23 of the valve body 9, and a seal ring c25 is attached to the groove, and the inner peripheral surface of the cylindrical recess b23 of the valve body 9 and the piston housing cylinder 24 are provided. Sealing with the outer peripheral surface is performed. The valve body 9 slides on the inner peripheral surface of the casing 2 as the piston 16 advances and retracts and the urging force of the return spring 20 is applied. The through-hole b13 in the valve body 9 in the first embodiment is a through hole b13 penetrating the bottom surface of the cylindrical recess a12 formed on the end face or al the other end face side of the body portion 15 side Yes.

  The seal ring c25 can prevent fluid from flowing between the piston housing cylinder 24 and the piston 16.

  In the first and second embodiments of the present invention, the usage method in which two kinds of different fluids are allowed to flow out from the outlet channel port 3 according to the temperature of the external object has been described, but the present invention is not limited to this. The outlet channel port 3 is used as an inlet channel port, the other two inlet channel ports 4 and 5 are used as outlet channel ports, and the fluid flowing in from the inlet channel port is selectively discharged from one of the two outlet channel ports. Can also be used. The operation of the switching valve is the same as in the first and second embodiments.

  1 .. Valve body, 2. Casing, 3 .. Outlet passage port, 4, 5 .. Inlet passage port, 6, 7, 8 .. Communication hole a, 9 .. Valve body, 10, 11. Rings a, 12 .. Columnar recesses a, 13 .. Communication hole b, 14 .. Wax element (actuator part), 15 .. Wax element body, 15 a .. Head part, 15 b. ), 16 .. Piston, 17 .. Seal ring b, 18 .. Mounting plate member, 18 a .. Fixing plate portion, 18 b .. Side plate portion, 18 c .. Mounting plate portion, 19 .. Through hole, 20. Return spring, 21 ... through hole, 22 ... bolt, 23 ... cylindrical recess b 24 ... piston housing cylinder, 25 ... seal ring c, A, B ... fluid.

Claims (4)

In the switching valve in which the wax element body is fixed inside the valve body, and the temperature detection part in the wax element body is arranged outside the valve body,
The valve body has three outlets projecting outward,
The wax element body includes the temperature detection unit in which wax that expands and contracts according to the detected temperature outside the valve body, a fixing unit that fixes the wax element body inside the valve body, An actuator part fixed to the inside of the fixing part, and a piston that slides inside the actuator part by a pressure accompanying expansion of the wax, and
The inside of the valve body is provided with a columnar valve body that is pressed and slid by the end face of the piston, and a return spring that constantly presses the valve body and the piston,
The three outflow inlets are located outside the area where the valve body slides, and the two outflow inlets which are located at the same distance as the length of the valve body in the sliding direction in the sliding area of the valve body. And the other outflow inlets located on the side away from the temperature detection unit with respect to the two outflow inlets,
The valve body that selectively closes one of the two outflow inlets is formed with a concentric columnar recess concentric with the valve body that houses the return spring on the end face side away from the temperature detection unit. and, communication holes are a plurality of formed at intervals in the circumferential direction through the other end face of the bottom or found before Kiben of the cylindrical recess,
A switching valve characterized by that. The switching valve according to claim 1,
A portion where the end surface of the piston presses the valve body is located inside the valve body, and the piston slides inside a cylindrical piston storage cylinder formed to protrude from the actuator portion toward the valve body side. The piston housing cylinder is inserted into a cylindrical recess formed concentrically with the valve body on an end surface side of the valve body on the temperature detection unit side, and is disposed outside the cylindrical recess of the valve body. In, a plurality of communication holes that penetrate from the end surface on the temperature detection unit side to the other end surface and the bottom surface of the other cylindrical recess are formed at intervals in the circumferential direction.
A switching valve characterized by that. The switching valve according to claim 1 or 2,
In the three outflow inlets of the valve body, the two outflow inlets are fluid inflow portions, and the fluid selectively flowing in from either one of the outflow inlets flows out of the other outflow inlets, or the other The switching valve is characterized in that the outflow inlet is a fluid inflow portion, and the fluid selectively flows out from either one of the two outflow inlets. A method of using a switching valve, wherein the switching valve according to any one of claims 1 to 3 is attached to an external object by using an attachment member for attaching the valve body to the external object.

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