WO2023181723A1

WO2023181723A1 - Heat medium heating device

Info

Publication number: WO2023181723A1
Application number: PCT/JP2023/005389
Authority: WO
Inventors: 健二安本
Original assignee: サンデン株式会社
Priority date: 2022-03-22
Filing date: 2023-02-16
Publication date: 2023-09-28
Also published as: JP2023139885A

Abstract

[Problem] To prevent water from accumulating at the sealing point of an insertion hole for drawing a wire into the interior of a housing, and to reduce installation costs by eliminating an excessive waterproof structure. [Solution] This heat medium heating device comprises a housing having an interior in which a heater is supported and having a flow path through which a heat medium flows in the vicinity of the heater, a control room in which a control board for controlling the heater is disposed is provided within the housing, and an insertion hole through which a wire connected to the control board passes is provided in the side of the housing. The opening of the insertion hole is provided in the end surface of a protrusion that protrudes outward from the side of the housing, and the end surface extends further outward than the outer edge of a seal member that is in close contact with the end surface and seals the insertion hole.　

Description

Heat medium heating device

The present invention relates to a heat medium heating device.

Electric Coolant Heater (ECH) is a device that electrically heats the heat medium (including water, coolant, refrigerant, etc.) flowing through a heat exchanger for air conditioning, etc. A heating element such as an electric wire heater or a PTC (Positive Temperature Coefficient) heater is installed inside.

In the housing of such a heat medium heating device, a control board for controlling the above-mentioned electric heating wire heater and PCT heater is arranged in a housing space that is separated from the flow path of the heat medium. Circuit components such as an IGBT (Insulated Gate Bipolar Transistor) mounted on a control board are arranged (see Patent Document 1 below).

Japanese Patent Application Publication No. 2011-225074

The above-mentioned electric heat medium heating device draws HV (High Voltage) wiring and other LV (Low Voltage) wiring into the housing for flowing large current to the heating element via switching elements such as IGBTs, Its terminals are connected to the control board. Furthermore, when the heat medium heating device is for use in a vehicle, communication wiring is drawn into the casing in order to transmit control signals of the in-vehicle network to the control board, and its terminals are connected to the control board.

When drawing such wiring, conventional heat medium heating devices draw the wiring into the housing through the insertion hole provided on the side of the housing, fit the protrusion of the sealing member through which the wiring passes into the insertion hole, and By bringing the back side of the seal member into close contact with the side surface of the casing, the interior of the casing is kept sealed.

However, according to such conventional technology, when water adheres to the side surface of the casing of the heat medium heating device, water tends to enter the contact surface between the casing side surface and the sealing member. If water enters the contact surface between the side surface of the casing and the seal member, there is a concern that water will accumulate in the fitting portion between the insertion hole and the seal member, causing corrosion. In order to avoid this, it is necessary to provide a waterproof structure to prevent water from adhering to the side surface of the housing of the heat medium heating device, which poses a problem of increasing installation cost.

The present invention aims to address such problems. In other words, it is an object of the present invention to prevent water from accumulating in the sealed portion of the insertion hole for leading the wiring into the interior of the casing in a heat medium heating device, and to reduce the installation cost by omitting an excessively waterproof structure. be.

In order to solve such problems, a heat medium heating device according to the present invention has the following configuration.
a casing in which a heater is supported and a flow path through which a heat medium flows near the heater; a control room in which a control board for controlling the heater is disposed is provided within the casing; A heat medium heating device having an insertion hole on a side surface through which wiring connected to the control board passes, the opening of the insertion hole being provided on an end surface of a protrusion that projects outward from the side surface of the casing. A heat medium heating device characterized in that the end surface extends outward from an outer edge of a sealing member that is in close contact with the end surface and seals the insertion hole.

The heat medium heating device of the present invention having such characteristics prevents water from accumulating in the sealed portion of the insertion hole for leading the wiring into the inside of the casing, and reduces installation costs by eliminating an excessively waterproof structure. I can do it.

FIG. 1 is an external perspective view of a heat medium heating device according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of a heat medium heating device according to an embodiment of the present invention. FIG. 1 is an enlarged view of main parts of a heat medium heating device according to an embodiment of the present invention. FIG. 1 is an exploded side view of a heat medium heating device according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a heat medium heating device according to an embodiment of the present invention (vertically placed state).

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different figures indicate parts with the same function, and redundant explanation in each figure will be omitted as appropriate.

As shown in FIGS. 1 to 4, the heat medium heating device 1 includes a casing 10 in which a heater 2 is supported and a flow path (not shown) through which the heat medium flows near the heater 2. In the illustrated example, the housing 10 is composed of blocks that can be divided into three, and each block is a main body frame 10A, a lid frame 10B, and a heater support frame 10C.

The housing 10 is provided with an inlet 11 and an outlet 12 for the heat medium. In the illustrated example, the inlet 11 is provided in the heater support frame 10C among the blocks that can be divided into three parts of the housing 10, and the outlet 12 is provided in the main body frame 10A, but the present invention is not particularly limited to this.

In the illustrated example, the heater 2 is a cartridge type cylindrical heating wire heater, and a pair (two) of the heaters 2 are arranged in parallel in the housing 10, with a part of the heater support frame 10C. The end portion is housed in the main body frame 10A.

A flow path is formed around the heater 2 in the casing 10, through which the heat medium that has flowed in from the inlet 11 flows, and the heat medium that has passed through this flow path and been heated by the heater 2 flows from the outlet 12. It's starting to leak out. External piping (not shown) is connected to the inflow port 11 and the outflow port 12, respectively, and a seal portion is formed at each of these connection portions.

Note that the main body frame 10A of the housing 10 and the heater support frame 10C are airtightly connected with a gasket 13 in between. The aforementioned heat medium flow path is formed within the opening of the gasket 13, and the flow path in the heater support frame 10C that communicates with the inlet 11 and the flow path in the main body frame 10A that communicates with the outlet 12 are formed in the gasket. It communicates within the opening of 13. Furthermore, the heater insertion opening 14 of the heater support frame 10C is sealed by the sealing member 2A by inserting the heater 2, and the connection terminal 2B at the end of the heater 2 is exposed to the control chamber 20 side, which will be described later, of the main body frame 10A. However, the exposed opening (not shown) is sealed by a sealing member 2C.

In the housing 10, a control chamber 20 is formed by a portion of the main body frame 10A that is opened by removing the lid frame 10B and a space inside the lid frame 10B. The control room 20 is airtightly separated from the aforementioned heat medium flow path in the housing 10 .

The housing 10 includes a support protrusion 21 that supports the control board 3 on the side of the main body frame 10A facing the control chamber 20, and also includes a protrusion 22 that protrudes in the direction in which the support protrusion 21 protrudes. The control board 3 is supported at the tip of the support protrusion 21 and fixed with a screw 3P, so that the control board 3 is supported at a position away from the heater 2 supported within the housing 10.

The raised portion 22 provided on the main body frame 10A of the housing 10 has a mounting surface 22A on its top, and a heat generating circuit component (for example, an IGBT unit) 4 is placed on the mounting surface 22A via an insulating sheet 4F. It is placed there. The mounting surface 22A faces the surface of the control board 3, and the terminals 4A of the circuit components 4 mounted on the mounting surface 22A are connected to the control board 3.

The main body frame 10A and the lid frame 10B of the casing 10 are fastened together with a plurality of screws 15 to form an airtight control chamber 20 therein. A fastening surface 23 for fastening the lid frame 10B with the screws 15 is formed at the outer peripheral end of the main body frame 10A. It includes two short sides located at diagonal positions, and is formed to diagonally cross the side surface of the housing 10 where the inlet 11 and the outlet 12 are provided.

By forming the fastening surfaces 23 between the main body frame 10A and the lid frame 10B in the housing 10 obliquely in this way, the above-mentioned heater insertion opening 14 and the wiring insertion hole described later can be formed in the lid frame 10B of the housing 10. It can be concentrated on an unrelated side surface, and furthermore, the open space of the control room 20 when the lid frame 10B is removed can be enlarged. Thereby, it is possible to improve the ease of handling the heater 2 and the wiring, and it is also possible to improve the workability of attaching and maintaining the control board 3 and the like in the control room 20.

An insertion hole 30 is provided on the side surface of the housing 10 (the side surface of the main body frame 10A), through which the wiring 5 whose end is connected to the control board 3 disposed in the control room 20 passes. In the illustrated example, three insertion holes 30 (

insertion holes

30A, 30B, and 30C) are provided, and two of them are used for HV wiring for passing a large current to the heater 2 via the heat generating circuit component 4. One is for LV wiring, and the other one is for communication wiring for transmitting control signals of an in-vehicle network to a control board, for example.

In the heat medium heating device 1 according to the embodiment of the present invention, when the above-mentioned insertion hole 30 is provided on the side surface of the housing 10 (main body frame 10A), the opening of the insertion hole 30 is It is provided on the end surface 16A of the protrusion 16 that protrudes outward from the side surface.

A seal member 31 that seals the insertion hole 30 is attached to the end surface 16A of the protrusion 16. Here, the end face 16A is provided with a fixing hole 16B, and by tightening the screw 31P into the fixing hole 16B through the seal member 31, the seal member 31 is attached in close contact with the end face 16A. The sealing member 31 seals the insertion hole 30 in a state in which the wiring 5 is inserted, and includes an insertion sealing portion 31A through which the wiring 5 is inserted. A metal flange is used as the seal member 31 to seal the

insertion holes

30A and 30B of the HV wiring.

In the illustrated example, two

insertion holes

30A and 30B are sealed with a seal member 31, and the other insertion hole 30C is sealed with a connector 32. The connector 32 includes a lead-out terminal 32A that is connected to the control board 3, and by connecting the terminal of the communication wiring to the connector 32, the communication wiring is connected to the control board 3.

According to such a heat medium heating device 1, the insertion hole 30 for inserting the wiring 5 into the control chamber 20 in the casing 10 is opened in the end surface 16A of the protrusion 16 protruding from the side surface of the casing 10. Therefore, even if water adheres to the surface of the casing 10, it will be difficult for the water to reach the end surface 16A of the protrusion 16 which is higher than the side surface of the casing 10, and the water will not reach the contact surface of the sealing member 31. It becomes difficult to accumulate. This improves the rust or corrosion resistance at the insertion location of the wiring 5 (the seal location of the insertion hole 30).

At this time, since the surface to which the sealing member 31 is brought into close contact is the end surface 16A of the protrusion 16, the surface processing to improve the adhesion of the sealing member 31 only needs to be performed on the end surface 16A, and the processing area is It is possible to reduce machining time by reducing the size.

Here, the end surface 16A extends outward from the outer edge of the sealing member 31 that tightly contacts the end surface 16A and seals the insertion hole 30. By making the end surface 16A of the protrusion 16 wider than the outer edge of the sealing member 31 in this way, the risk of water accumulating in the close contact area of the sealing member 31 is further reduced, and the rust or corrosion resistance in the vicinity of the insertion hole 30 is improved. can be improved.

In the illustrated example, as shown in FIG. 5, tapered

surfaces

17A and 17B are provided on the side surface of the casing 10 where the protrusion 16 is provided. By providing such

tapered surfaces

17A and 17B, the side surface of the casing 10 on which the protrusion 16 is provided is inclined so that the position of the protrusion 16 forms a mountain. As a result, as shown in FIG. 5, even when the heat medium heating device 1 is vertically placed vertically, water that has arrived at the side surface of the casing 10 where the protruding portion 16 is provided is removed from the tapered surface. 17A and 17B move in the direction away from the protrusion 16, and furthermore, it is possible to prevent water from accumulating in the sealed portion of the insertion hole 30.

In the illustrated example, a plurality of through

holes

30A, 30B, and 30C are provided on the same end surface 16A of the protrusion 16. By doing this, there is one surface to be machined to improve the adhesion of the seal member 31 to the plurality of

insertion holes

30A, 30B, and 30C, which makes it possible to reduce the machining time and improve the adhesion. Adhesion can be easily managed by having one end face to ensure the same.

The heat medium heating device 1 described above is installed in a vehicle such as a hybrid car or an electric car, and in the case of a hybrid car, it is used as an auxiliary heat source for supplying heat to supplement the insufficient waste heat of the engine. In this case, it is applied to vehicle air conditioners as an alternative heat source that supplies heat in place of an engine that does not exist.

As an example, in the case of a hybrid vehicle, LLC (Long Life Coolant) for cooling the engine flows as a heat medium in the flow path of the heat medium heating device 1 and is heated by the heater 2 . The LLC circuit is installed in the vehicle air conditioner, and the LLC heat heated by the engine or heat medium heating device 1 is used to heat the refrigerant circulating in the refrigerant circuit installed in the vehicle air conditioner. The room is heated and cooled. Furthermore, in both hybrid vehicles and electric vehicles, the heating circuit in which antifreeze circulates is provided with a heating medium heating device 1 together with a heater core, and the heating medium heating device 1 is used as a heat source for heating the antifreeze. Sometimes, air heated by a heater core is blown into the passenger compartment.

Furthermore, in the case of an electric vehicle, the refrigerant of the refrigerant circuit flows through the flow path of the heat medium heating device 1, and the refrigerant is heated by the heater 2. The refrigerant circuit itself serves as a heat source for the vehicle air conditioner as a heat pump, but the heat medium (water) of the heat medium circuit (water circuit) that exchanges heat with the refrigerant circuit is passed through the flow path of the heat medium heating device 1. Hot water can be obtained and used as a heat source for a vehicle air conditioner or for temperature control of objects to be temperature controlled, such as batteries.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention. Moreover, the above-described embodiments can be combined by using each other's technologies unless there is a particular contradiction or problem in the purpose, structure, etc.

1: Heat medium heating device,
2: Heater, 2A, 2C: Seal member, 2B: Connection terminal,
3: Control board, 3P: Screw,
4: Circuit components (IGBT unit), 4A: Terminal, 4F: Insulating sheet,
5: Wiring,
10: Housing, 10A: Main frame, 10B: Lid frame, 10C: Heater support frame,
11: Inlet, 12: Outlet, 13: Gasket, 14: Heater insertion port,
15: Screw, 16: Projection, 16A: End surface, 16B: Fixing hole,
17A, 17B: Tapered surface,
20: Control chamber, 21: Support protrusion, 22: Protrusion, 22A: Placement surface, 23: Fastening surface,
30 (30A, 30B, 30C): Through hole,
31: Seal member, 31A: Penetration seal portion, 31P: Screw,
32: Connector, 32A: Pull-out terminal

Claims

a casing in which a heater is supported and a flow path through which a heat medium flows near the heater; a control room in which a control board for controlling the heater is disposed is provided within the casing; A heat medium heating device provided with an insertion hole on a side surface through which wiring connected to the control board passes,
The opening of the insertion hole is provided on an end surface of a protrusion that projects outward from a side surface of the housing, and the end surface spreads outward from an outer edge of a sealing member that tightly contacts the end surface and seals the insertion hole. A heat medium heating device characterized by:
The heat medium heating device according to claim 1, wherein the side surface of the casing is inclined so that the position of the protrusion is a mountain.
The heat medium heating device according to claim 1 or 2, wherein a plurality of the openings are provided on the same end surface of the protrusion.
2. The heat medium heating device according to claim 1, wherein an HV (High Voltage) wiring is inserted through the insertion hole, and the sealing member is a metal member.