CN111663991A - Fixing structure of heating rod end for electric heating thermostat - Google Patents

Abstract

The invention relates to a heating rod end fixing structure for an electric heating type thermostat. The heating rod end fixing structure is sealed and fixed on a thermostat cover, and includes a heating rod, a metal bush, a rubber block and a sealing ring. One end of the heating rod is connected to the vehicle power supply through a wire through the metal bushing, and the other end is connected to the temperature sensing element. The heating rod and the metal bushing are sealed and fixed by laser welding; There is a rubber block for sealing, and the metal bushing is vulcanized and bonded to the rubber block. Compared with the traditional fixed structure at the end of the heating rod, the new structure has a simpler structure and is easy to assemble; the standard O-ring piston sealing structure is adopted, and the sealing reliability is higher; its structural characteristics allow repeated loading and unloading, which can effectively reduce manufacturing Waste caused by rework and rework in the process.

Description

Fixing structure of heating rod end for electric heating thermostat

technical field

The invention relates to an engine cooling system, in particular to a heating rod end fixing structure for an electrically heated thermostat.

Background technique

The end of the heating rod of the heating thermostat needs to be fixed on the upper end of the shell and sealed at the same time. Since the other end of the heating rod is connected to the sensor, and the sensor is fixedly connected to the valve, this cooperation makes the valve in the open state, it is easy to transmit the impact force of the water flow to the top of the heating rod, and the force changes with the pressure of the water flow. and direction changes.

The changing stress conditions are prone to the following two situations:

1. When a non-axial force is applied to the heating rod, the end of the heating rod is prone to stress concentration. In extreme cases, the shell of the heating rod will be ruptured, and the coolant will immerse into the heating rod, forming a short circuit and causing the heating function of the thermostat. lost; lost

2. When the non-axial force impacts the edge of the valve, it will cause the valve to rotate, and the wire welded at the end of the heating rod will be entangled under the action of the valve rotation, and finally the wire will be pulled, causing the welding between the wire and the heating connector. The point falls off, forming an open circuit, resulting in the loss of the heating function of the thermostat.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a heating rod end fixing structure for an electric heating type thermostat, which provides a certain flexible change space and anti-rotation under the premise of ensuring effective sealing between the heating rod end and the casing. characteristic.

The technical scheme adopted in the present invention is: a heating rod end fixing structure for an electric heating type thermostat, which is sealed and fixed on the thermostat cover, and is characterized in that it includes a heating rod, a metal bush, a rubber block and a sealing ring. , one end of the heating rod is connected to the vehicle power supply through a wire through the metal bushing, and the other end is connected to the temperature sensing element, and the heating rod and the metal bushing are sealed and fixed by laser welding; the metal bushing is connected to the temperature regulation A rubber block for sealing is arranged between the housings, and the metal bushing is vulcanized and bonded to the rubber block.

Preferably, the metal bushing is sleeved in the heating rod installation hole of the thermostat cover, the lower end hooks the end face of the heating rod installation hole hole wall, and the upper end extends out of the heating rod installation hole; the metal bushing adopts a stepped shaft The structure includes a large shaft part at the lower end and a small shaft part at the upper end, the large shaft part is in clearance fit with the installation hole of the heating rod, and a rubber block is arranged on the small shaft part.

Further, a sealing ring is provided between the large shaft portion and the installation hole of the heating rod.

Further, the rubber block includes an upper conical surface and a lower conical surface, and a groove for accommodating the deformation of the rubber block is provided between the lower conical surface and the end surface of the large shaft portion.

Preferably, the sealing ring adopts an O-ring.

The beneficial effects obtained by the invention are: compared with the traditional heating rod end fixing structure, the new structure has a simpler structure and is easy to assemble; the standard O-ring piston sealing structure is adopted, and the sealing reliability is higher; its structural characteristics Allows repeated loading and unloading, which can effectively reduce the waste caused by rework and rework in the manufacturing process.

Description of drawings

1-3 are schematic diagrams of assembly of the present invention;

Fig. 4 is the structural representation that the present invention is assembled on the thermostat;

5-20 are schematic structural diagrams of rubber blocks with different structures adopted in the present invention;

Reference numerals: 1, cover body; 11, heating rod mounting hole; 2, heating rod; 3, metal bushing; 31, large shaft part; 32, small shaft part; 4, rubber block; 41, upper cone surface; 42. Lower cone surface; 5. Groove; 6. Sealing ring; 7. Sealing ring installation groove.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-4, a heating rod end fixing structure for an electric heating thermostat of the present invention is sealed and fixed on the thermostat cover 1, including a heating rod 2, a metal bush 3, and a rubber block 4 And the sealing ring 5, the upper end of the heating rod 2 is connected to the vehicle power supply through the metal bushing 3 through the wire, and the lower end is connected to the temperature sensing element, and the heating rod 2 and the metal bushing 3 are sealed and fixed by laser welding (of course, other It is only required that the heating rod and the metal bushing are firmly connected and meet the sealing requirements); a rubber block 3 for sealing is provided between the metal bushing 2 and the thermostat cover 1, and the metal bushing 2 and the rubber The block 3 is vulcanized and bonded (other connection methods are not excluded, the metal bushing 2 and the rubber block 3 can meet the connection requirements).

In this embodiment, the metal bushing 3 is sleeved in the heating rod installation hole 11 of the thermostat cover 1, the lower end of the metal bushing 3 hooks the lower end surface of the hole wall of the heating rod installation hole 11, and the upper end extends out of the heating rod installation hole Outside 11, the rubber block 3 is arranged on the upper end of the metal bushing 3. After the installation is completed, the rubber block 3 clamps the upper end surface of the hole wall of the heating rod installation hole 11 to limit the axial movement of the metal bushing 3.

In this embodiment, the metal bushing 3 adopts a stepped shaft structure, including a large shaft part 31 at the lower end and a small shaft part 32 at the upper end. A sealing ring 6 is provided in the sealing ring installation groove 7 (the O-ring with good sealing effect is used in this embodiment), and the sealing ring 6 is arranged between the large shaft portion 31 and the heating rod installation hole 11 , to complete the sealing between the metal bushing 3 and the heating rod mounting hole 11 . The upper end of the small shaft portion 32 is provided with a rubber block 4. The rubber block 4 includes an upper tapered surface 41 and a lower tapered surface 42. During installation, the upper tapered surface 41 is used for guiding, which is conducive to the installation of the fixing structure at the end of the heating rod; The lower conical surface 42 is used for guidance, which is conducive to the disassembly of the fixing structure at the end of the heating rod; between the lower conical surface 42 and the end surface of the large shaft portion 31, there is a groove 5 for accommodating the deformation of the rubber block. As shown in Figure 5-20, this In the embodiment, the head structure for the rubber block 4 to be matched with the heating rod mounting hole 11 can take various forms.

The basic principles and main structural features of the present invention have been shown and described above. The present invention is not limited by the above examples, and without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A heating rod end fixing structure for an electric heating type thermostat, which is sealed and fixed on the thermostat cover, characterized in that it comprises a heating rod, a metal bushing, a rubber block and a sealing ring, and the heating rod wears One end of the metal bushing is connected to the vehicle power supply through a wire, and the other end is connected to the temperature sensing element. The heating rod and the metal bushing are sealed and fixed; The rubber block, the metal bushing is fixedly connected with the rubber block. 2. The heating rod end fixing structure for an electric heating type thermostat according to claim 1, wherein the metal bush is sleeved in the heating rod installation hole of the thermostat cover, and the lower end hooks the heating rod for installation The end face of the hole wall, the upper end protrudes out of the heating rod installation hole; the metal bush adopts a stepped shaft structure, including a large shaft part at the lower end and a small shaft part at the upper end, and the large shaft part fits with the heating rod installation hole in a clearance fit. A rubber block is arranged on the small shaft portion. 3 . The heating rod end fixing structure for an electric heating thermostat according to claim 2 , wherein a sealing ring is provided between the large shaft portion and the heating rod installation hole. 4 . 4. The heating rod end fixing structure for an electric heating type thermostat according to claim 2, wherein the rubber block comprises an upper conical surface and a lower conical surface, and between the lower conical surface and the end surface of the large shaft portion There is a groove for accommodating the deformation of the rubber block. 5 . The fixing structure of the heating rod end for an electric heating thermostat according to claim 1 , wherein the sealing ring adopts an O-ring. 6 . 6. The heating rod end fixing structure for an electric heating thermostat according to claim 1, wherein the heating rod and the metal bush are sealed and fixed by laser welding. 7 . The fixing structure of the heating rod end for an electric heating type thermostat according to claim 1 , wherein the metal bushing is vulcanized and bonded to the rubber block. 8 .

Images