Relief valve and cooling circuit using same

Abstract

To provide a relief valve capable of ensuring a flow rate without increasing the size, and a cooling circuit using the same.SOLUTION: A relief valve 1 includes: a supply side connecting pipe 4a; a discharge side connecting pipe 5a which is arranged along the supply side connecting pipe 4a; a casing 6 which is connected with the supply side connecting pipe 4a and the discharge side connecting pipe 5a, and has an inflow port 61c opened in the supply side connecting pipe 4a and an outflow port 62c opened in the discharge side connecting pipe 5a; a valve seat (opening edge 61a) which is provided in the casing 6; a valve body 7 which is arranged in the casing 6, and can block communication between the inflow port 61c and the outflow port 62c in the casing 6 by being seated on the valve seat (opening edge 61a); and an energizing member 8 for energizing the valve body 7 to the valve seat (opening edge 61a). The inflow port 61c is provided in the casing 6 so as to be eccentric to a center axis of the valve body 7 in an extending direction of the supply pipe 4.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a relief valve and a cooling circuit using the same. [Background technology]

[0002] Conventionally, a cooling circuit that cools an object to be cooled with a cooling medium is known (see, for example, Patent Document 1). The cooling circuit of Patent Document 1 is provided with a relief valve that releases pressure to protect a heat exchange section when the pressure of the cooling medium supplied to the heat exchange section is high. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 55-123622 Summary of the Invention [Problem to be solved by the invention]

[0004] When a supply-side connecting pipe connected to a supply pipe that supplies cooling medium to the heat exchanger and a discharge-side connecting pipe connected to a discharge pipe that discharges the cooling medium are arranged alongside each other and a relief valve is provided at the bypass connection between the supply-side connecting pipe and the discharge-side connecting pipe, and when the pressure of the cooling medium in the supply pipe is high, the pressure is released to the discharge pipe via the relief valve, the cooling medium may sometimes make a U-turn and flow from the middle of the supply-side connecting pipe to the discharge-side connecting pipe. In such cases, it may be difficult to ensure the flow rate that passes through the relief valve.

[0005] If the inlet of the cooling medium in the relief valve is called the inlet and the outlet of the cooling medium is called the outlet, this is because, when the relief valve is provided so that the cooling medium makes a U-turn as described above, even though the inlet and the valve body of the relief valve are arranged concentrically, the cooling medium flows biasedly to the outside of the U-turn part, i.e., to the side closer to the heat exchanger, and a part where the flow speed of the cooling medium becomes fast near the outlet in the discharge side connecting pipe is generated, and the flow resistance becomes high in this part. Also, the flow rate can be increased by making the relief valve larger, but there is a limit to how large the relief valve can be made because it is difficult to secure sufficient installation space due to reasons such as the positional relationship with other devices. In view of the above, an object of the present invention is to provide a relief valve that can ensure a flow rate without increasing the size, and a cooling circuit using the same. [Means for solving the problem]

[0006] the above To achieve the object, the relief valve of the present invention comprises: Cooling medium A supply side connecting pipe connected to the supply pipe; The supply side connecting pipe is arranged along the supply side connecting pipe. Cooling medium Connected to the exhaust pipe, The flow direction of the cooling medium is opposite to that of the supply side connecting pipe. A discharge side connecting pipe; a housing connected to the supply side connecting pipe and the discharge side connecting pipe, the housing having an inlet opening into the supply side connecting pipe and an outlet opening into the discharge side connecting pipe; A valve seat provided within the housing; a valve body that is disposed within the housing, the valve body being seated on the valve seat to block communication between the inlet and the outlet, and being separated from the valve seat to allow communication between the inlet and the outlet; a biasing member that biases the valve body in a direction to seat the valve body on the valve seat; Equipped with The inlet is provided in the housing so as to be eccentric with respect to a central axis of the valve body in an extending direction of the supply side connecting pipe.

[0007] According to the present invention, a supply side connecting pipe that supplies a cooling medium to the heat exchange unit and a discharge side connecting pipe that discharges the cooling medium are arranged alongside each other without increasing the size, and a relief valve is provided in the bypass section between the supply side connecting pipe and the discharge side connecting pipe.When the pressure of the cooling medium supplied to the heat exchange unit is high, the pressure is released from midway through the supply side connecting pipe to the discharge side connecting pipe via the relief valve, and even when the cooling medium flows in a U-turn, the flow rate can be secured without increasing the size of the relief valve.

[0008] This is because, when the inlet is offset from the center axis of the valve body toward the side away from the heat exchange unit, the cooling medium flows relatively evenly around the valve body arranged in the part where the cooling medium makes a U-turn, and it is possible to prevent the flow resistance from becoming high in the discharge side connecting pipe. from It is.

[0009] Alternatively, if the inlet is eccentric toward the side approaching the heat exchange unit, the cooling medium will more easily pass through the heat exchange unit side within the relief valve, i.e., the side where the cooling medium is actively trying to flow.

[0010] In addition, in the present invention, the valve body may be cylindrical with a bottom, and the housing may be provided with a plurality of ribs that abut against the outer peripheral surface of the valve body to allow the valve body to move in the biasing direction by the biasing member while maintaining its central position within the housing. Also, In the present invention, it is preferable that the outlet is provided in the housing so as to be eccentric with respect to an extending direction of the discharge side connecting pipe.

[0011] According to the present invention, it is easy to ensure the flow rate of the cooling medium passing through the relief valve.

[0012] Also, The cooling circuit of the present invention comprises: The relief valve is provided. The supply side connecting pipe is for introducing a cooling medium into the heat exchanger, The discharge side connecting pipe is characterized in that it discharges the cooling medium.

[0013] According to the present invention, when the pressure of the cooling medium supplied to the heat exchanger is high, the pressure is released from the middle of the supply side connecting pipe to the discharge side connecting pipe via the relief valve, and even when the cooling medium flows in a U-turn, the flow can be controlled without increasing the size of the relief valve. amount can be secured. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing a relief valve according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view illustrating the relief valve of the first embodiment. [Diagram 3] FIG. 2 is an explanatory view showing a first half of the relief valve of the first embodiment, viewed from a second half side. [Figure 4] FIG. 4 is an explanatory view showing a second half of the relief valve of the first embodiment, as viewed from the first half side. [Diagram 5] FIG. 11 is an explanatory view showing a first half of a relief valve according to a second embodiment of the present invention, viewed from the second half side. [Figure 6] FIG. 11 is an explanatory view showing a second half of a relief valve according to a third embodiment of the present invention, viewed from the first half side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [First embodiment] A first embodiment of a relief valve of the present invention will be described with reference to FIGS. 1 to 4. FIG.

[0016] Referring to FIG. 1, a cooling circuit equipped with a relief valve 1 of the first embodiment performs heat exchange by circulating a cooling medium such as coolant that has been warmed by cooling an internal combustion engine through a heat exchange section such as a radiator, a heater core, an AT (automatic transmission) / CVT (continuously variable transmission), or an EGR (exhaust gas recirculation), and is equipped with a supply pipe 4 that supplies the cooling medium to the heat exchange section 3, and a relief valve 1 that releases the pressure in the supply pipe 4 to a discharge pipe 5 when the pressure in the supply pipe 4 reaches or exceeds a predetermined value.

[0017] The relief valve 1 includes a supply-side connecting pipe 4a connected to a supply pipe 4, a discharge-side connecting pipe 5a connected to a discharge pipe 5, and a housing 6 connecting the supply-side connecting pipe 4a and the discharge-side connecting pipe 5a. The discharge-side connecting pipe 5a is arranged parallel or approximately parallel to the supply-side connecting pipe 4a. The housing 6 is formed by overlapping a cylindrical first half 61 connected to the supply-side connecting pipe 4a and a hemispherical second half 62 connected to the discharge-side connecting pipe 5a.

[0018] Referring to the cross-sectional view of Figure 2, the relief valve 1 comprises a bottomed cylindrical valve body 7 housed in a first half 61, and a biasing member 8 consisting of a coil spring housed in a second half 62 and biasing the valve body 7 toward the first half 61.

[0019] The valve body 7 is arranged so that its opening side faces the second half 62 side, and is arranged so as to be movable within the housing 6 along the central axis direction of the valve body 7. A protruding portion 7a that protrudes radially outward is provided at the opening edge of the valve body 7 on the second half 62 side. When this protruding portion 7a abuts against the opening edge 61a on the second half 62 side of the first half 61, communication between the inlet 61c and the outlet 62c described below is blocked, and movement of the valve body 7 toward the first half 61 side is restricted. On the other hand, when the protruding portion 7a moves away from the opening edge 61a, the inlet 61c and the outlet 62c communicate with each other through the gap, allowing the cooling medium to flow within the housing 6. That is, the opening edge 61a of the first half 61 functions as a valve seat on which the valve body 7 is seated and separated.

[0020] 3 is a view showing the first half 61 from the second half 62 side. With reference to FIGS. 2 and 3, three ribs 61b extending in the direction in which the valve body 7 is pressed by the biasing member 8 are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the first half 61. The ribs 61b maintain the center position of the valve body 7 in the housing 6 while allowing the valve body 7 to move in the biasing direction by the biasing member 8. The first half 61 is also provided with an inlet 61c communicating with the supply pipe 4. The inlet 61c is provided eccentrically with respect to the central axis of the valve body 7 in the extension direction of the supply pipe 4 and in a direction away from the heat exchange unit 3.

[0021] Fig. 4 is a view showing the second half 62 from the side of the first half 61. With reference to Figs. 2 and 4, an annular groove is provided at the opening edge of the second half 62 which is overlapped with the first half 61, into which an O-ring 62a is fitted to liquid-tightly seal the gap between the first half 61 and the second half 62.

[0022] Here, when the pressure of the cooling medium in the supply side connecting pipe 4a increases to or exceeds a predetermined value, the valve body 7 moves toward the second half 62 against the biasing force of the biasing member 8 due to the pressure of the cooling medium.

[0023] Three ribs 62b are provided at equal intervals in the circumferential direction of the second half 62 on the inner peripheral surface of the second half 62 to regulate the amount of movement of the valve body 7 toward the second half 62 so as to ensure an appropriate gap between the valve body 7 and the second half 62. The second half 62 is also provided with an outlet 62c communicating with the discharge pipe 5. The outlet 62c is provided concentrically with the central axis of the valve body 7.

[0024] According to the relief valve 1 of the first embodiment and the cooling circuit using the same, the flow rate of the cooling medium can be ensured without increasing the size of the relief valve 1.

[0025] This is because the inlet 61c is offset with respect to the central axis of the valve body 7 in the extending direction of the supply side connecting pipe 4a and in the direction away from the heat exchange unit 3, so that the cooling medium flows relatively evenly through the valve body 7 and it is possible to prevent the flow path resistance on the outlet 62c side from increasing. Also, since the cooling medium flows relatively evenly through the valve body 7, it is possible to suppress the valve body 7 from tilting.

[0026] [Second embodiment] 5 is a view showing the first half 61 of the relief valve 1 according to the second embodiment of the present invention from the side of the second half 62. The relief valve 1 according to the second embodiment is configured in the same manner as the first embodiment, except that the shape of the inlet 61c provided in the first half 61 is a snowman shape with its head facing away from the heat exchange unit 3.

[0027] As is clear from the inlet 61c of the second embodiment, the inlet 61c of the present invention being eccentric in the extension direction of the supply pipe 4 with respect to the central axis of the valve body 7 means that the center point of the opening area of ​​the inlet 61c is shifted in the extension direction of the supply pipe 4 with respect to the central axis of the valve body 7. With the relief valve 1 of the second embodiment, as with the first embodiment, it is possible to ensure the flow rate of the cooling medium in the relief valve 1 without increasing the size of the relief valve 1.

[0028] [Third embodiment] 6 is a view showing the second half 62 of the relief valve 1 according to the third embodiment of the present invention from the first half 61 side. The relief valve 1 of the third embodiment is configured in the same manner as the first embodiment, except that the outlet 62c provided in the second half 62 is provided eccentrically in the extension direction of the discharge pipe 5 with respect to the central axis of the valve body 7, specifically, the outlet 62c is provided eccentrically in the direction away from the heat exchange section 3, similar to the inlet 61c. According to the relief valve 1 of the third embodiment, the flow rate of the cooling medium in the relief valve 1 can be more appropriately ensured.

[0029] [Other embodiments] In the first embodiment, the inlet 61c and the outlet 62c are described as being perfectly circular, but the shapes of the inlet 61c and the outlet 62c are not limited to this, and may be, for example, elliptical.

[0030] The eccentric direction of the inlet 61c may be any direction as long as it is the extending direction of the supply side connecting pipe 4a, and may be eccentric, for example, in a direction approaching the heat exchange unit 3. In such a configuration, the cooling medium can easily flow on the heat exchange unit 3 side in the relief valve 1, and similarly to the first embodiment, the effect of the present invention can be obtained that the flow rate of the cooling medium in the relief valve 1 can be secured.

[0031] Furthermore, when the inlet 61c is eccentric in a direction approaching the heat exchange unit 3, the outlet 62c can be eccentric in either direction, away from the heat exchange unit 3 or toward the heat exchange unit 3, as long as it is in the extension direction of the discharge side connecting pipe 5a, thereby more appropriately ensuring the flow rate of the cooling medium. [Explanation of symbols]

[0032] 1 Relief valve 3 Heat exchange section 4 Supply pipe 4a Supply side connecting pipe 5 Discharge pipe 5a Discharge side connecting pipe 6. Chassis 61 1st half 61a Opening edge (valve seat) 61b Rib 61c Inlet 62 Second half 62a O-ring 62b Rib 62c Outlet 7 Valve body 7a Overhang 8. Pressing member

Claims

1. A supply side connecting pipe connected to a supply pipe of a cooling medium; a discharge side connecting pipe that is disposed along the supply side connecting pipe and is connected to a cooling medium discharge pipe, the flow direction of the cooling medium being opposite to that of the supply side connecting pipe; a housing connected to the supply side connecting pipe and the discharge side connecting pipe, the housing having an inlet opening into the supply side connecting pipe and an outlet opening into the discharge side connecting pipe; A valve seat provided within the housing; a valve body that is disposed within the housing, the valve body being configured to seat on the valve seat to block communication between the inlet and the outlet, and to move away from the valve seat to allow communication between the inlet and the outlet; a biasing member that biases the valve body in a direction to seat the valve body on the valve seat; Equipped with The relief valve according to claim 1, wherein the inlet is provided in the housing so as to be eccentric with respect to a central axis of the valve body in an extending direction of the supply side connecting pipe.

2. A relief valve as described in claim 1, The valve body is cylindrical with a bottom, a relief valve characterized in that the housing is provided with a plurality of ribs that abut against the outer peripheral surface of the valve body to allow the valve body to move in the biasing direction by the biasing member while maintaining a central position within the housing.

3. The relief valve according to claim 1 or 2, The relief valve according to claim 1, wherein the outlet port is provided in the housing so as to be eccentric with respect to an extending direction of the discharge side connecting pipe.

4. The relief valve according to claim 1 or 2 is provided, The supply side connecting pipe is for introducing a cooling medium into the heat exchanger, The cooling circuit according to claim 1, wherein the discharge side connecting pipe is for discharging a cooling medium.

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