CN114623059A

CN114623059A - High leakproofness wax motor

Info

Publication number: CN114623059A
Application number: CN202210302765.5A
Authority: CN
Inventors: 何亮; 马彬焱
Original assignee: Hubei Hongshengchang Electronic Co ltd
Current assignee: Hubei Hongshengchang Electronic Co ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-06-14

Abstract

The invention relates to a high-sealing wax motor, which comprises a shell, an ejector rod, a first gasket, a first sealing ring and a thermal expansion material, and compared with the prior art, the high-sealing wax motor improves the structure of the first sealing ring, so that the conical part of the first sealing ring is inserted between the first gasket and the ejector rod and forms a second gap with the first gasket; and when the sealing device is not in a working state, the volume of the thermal expansion material is smaller when the thermal expansion material is in a low-temperature state, the pressure inside the sealing cavity is smaller or even zero, and the sealing device is convenient to disassemble and assemble.

Description

High leakproofness wax motor

Technical Field

The invention relates to the technical field of wax motors, in particular to a high-sealing wax motor.

Background

Wax motors provide simple and reliable linear drives for various applications including household appliances. Wax motors typically provide a metal housing and piston that contains the wax, so that expansion of the wax drives the piston outward. The wax expands when the housing is heated, for example by a resistor (e.g., a positive temperature coefficient thermistor). Typically, a return spring is present in the mechanism associated with the wax motor to return the piston into the housing as the wax cools.

It is therefore easily thought that the sealing of a wax motor directly affects its service life. When the sealing ring of the wax motor leaks and fails, the wax motor cannot function.

The invention patent with the publication number of CN105121847B discloses a wax motor with a long cycle life, which utilizes a polytetrafluoroethylene gasket to be sleeved on a shaft and obtains a good sealing effect in a manner of interference fit with the shaft. But this approach has the disadvantage of being difficult to install.

Disclosure of Invention

In view of the above, it is necessary to provide a high-sealing wax motor to solve the technical problem of difficult installation caused by interference fit between a seal ring and a shaft in order to obtain good sealing performance in the prior art.

The present invention provides a high-sealing wax motor, comprising: the sealing device comprises a shell, a mandril, a first gasket, a first sealing ring and a thermal expansion material, wherein the shell is provided with a cavity with an opening at one end, and a mounting groove is formed in the side wall of the cavity along the circumferential direction; one end of the ejector rod is inserted into the cavity, and the other end of the ejector rod extends out of the opening; the first gasket is annular and is arranged in the mounting groove and sleeved on the ejector rod, and a first gap is formed between the first gasket and the ejector rod; the first sealing ring comprises a circular ring part and a conical part which are fixedly connected with each other, the first sealing ring is provided with an inner hole penetrating through the circular ring part and the conical part and is sleeved on the ejector rod through the inner hole, the circular ring part is arranged in the mounting groove and is abutted against the end face, facing the opening, of the first gasket, and the conical part is inserted into the first gap and forms a second gap with the first gasket; the shell, the first sealing ring and the ejector rod surround to form a sealing cavity, and the sealing cavity is filled with thermal expansion materials.

Furthermore, the side face, facing the first gasket, of the conical part is an inclined plane, and the distance between the conical part and the first gasket is larger and larger along the direction from outside to inside of the axis of the mandril.

Further, still include the second gasket, the second gasket also is the ring shape, and it installs in the mounting groove and overlaps and establish on the ejector pin, and the second gasket is arranged in the one side that first gasket was kept away from to the ring portion.

Furthermore, the device also comprises a second sealing ring, the second sealing ring is sleeved on the ejector rod and is arranged between the second gasket and the circular ring part, and the second sealing ring is respectively abutted against the second gasket and the circular ring part.

Further, the mounting groove has a groove bottom surface parallel to the side surface in the cavity, and an outer side surface and an inner side surface perpendicular to the groove bottom surface, the outer side surface being closer to the opening than the inner side surface.

Furthermore, the peripheral face of the first gasket is abutted against the bottom face of the groove, and the end face, far away from the opening, of the first gasket is abutted against the inner side face of the first gasket.

Furthermore, the peripheral face of the second gasket is abutted against the bottom face of the groove, and the end face of the second gasket, which is close to the opening, is abutted against the outer side face.

Further, the first gasket and the second gasket are both copper gaskets.

Further, the first sealing ring is a polytetrafluoroethylene sealing ring.

Further, the thermally expansive material is wax.

Compared with the prior art, the high-sealing wax motor has the advantages that the structure of the first sealing ring is improved, the conical part of the first sealing ring is inserted between the first gasket and the ejector rod and forms a second gap with the first gasket, when the wax motor works, the internal thermal expansion material is heated and expanded to form larger pressure in the sealing cavity, the first gasket and the first sealing ring on two sides of the second gap are pressurized, and the first sealing ring, the ejector rod, the first gasket and the shell are pressed tightly to obtain a good sealing effect; and when the sealing device is in a non-working state, the thermal expansion material is in a low-temperature state, the volume is small, the pressure in the sealing cavity is small or even zero, and the sealing device is convenient to disassemble and assemble.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to be implemented in accordance with the content of the specification, the following detailed description is given with reference to the accompanying drawings and preferred embodiments of the present invention. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic view of a high sealing wax motor according to the present invention;

FIG. 2 is a cross-sectional view of a high sealing wax motor provided by the present invention;

fig. 3 is a schematic structural diagram of the first seal ring in fig. 2.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.

Referring to fig. 1 and 2, the high-sealing wax motor includes a housing 1, a plunger 2, a first gasket 3, a first sealing ring 4, and a thermal expansion material 5.

The housing 1 has a cavity with an opening at one end, and an installation groove is formed on the sidewall of the cavity along the circumferential direction and used for installing a sealing element. Preferably, the mounting groove may be a rectangular groove. That is, in some embodiments, the cavity in the housing 1 is a cylindrical structure, a circle of mounting grooves is circumferentially formed along the sidewall of the cavity, the mounting grooves have a groove bottom 11 parallel to the inner side of the cavity, and an outer side 12 and an inner side 13 perpendicular to the groove bottom 11, and the outer side 12 is closer to the opening than the inner side 13.

One end of the ejector rod 2 is inserted into the cavity, the other end of the ejector rod extends out of the opening, and the ejector rod 2 is used as a power output component of the wax motor and is generally in a cylindrical structure.

The first gasket 3 is annular, is installed in the mounting groove and is sleeved on the ejector rod 2, and a first gap is formed between the first gasket 3 and the ejector rod 2. In a preferred embodiment, a copper shim is used for the first shim 3 to obtain good ductility. And the shape and size of the outer peripheral surface of the first gasket 3 are adapted to the shape and size of the mounting groove, so that the outer peripheral surface of the first gasket 3 is abutted against the groove bottom surface 11, and the end surface of the first gasket 3, which is far away from the opening, is abutted against the inner side surface 13.

Referring to fig. 3, the first sealing ring 4 includes an annular portion 41 and a conical portion 42 fixedly connected to each other, and the first sealing ring 4 has an inner hole penetrating through the annular portion 41 and the conical portion 42 and is sleeved on the carrier rod 2 through the inner hole.

First sealing washer

4 and 2 clearance fit or transition fit of ejector pin to reduce the degree of difficulty of the first sealing washer 4 of dismouting. The annular portion 41 is mounted in the mounting groove and abuts against an end surface of the first gasket 3 facing the opening. In a preferred embodiment, the shape and size of the outer peripheral surface of the circular ring part 41 are adapted to the shape and size of the mounting groove, so that the outer peripheral surface of the circular ring part 41 abuts against the groove bottom surface 11. The conical portion 42 is inserted into the first gap and forms a second gap 14 with the inner peripheral surface of the first gasket 3.

In the preferred embodiment, the first sealing ring 4 is made of polytetrafluoroethylene sealing ring, and the sealing ring made of the polytetrafluoroethylene sealing ring has good sealing effect and long service life.

The shell 1, the ejector rod 2 and the first sealing ring 4 surround to form a sealing cavity, and the sealing cavity is filled with thermal expansion materials 5. The person skilled in the art can select a thermal expansion material 5 with a suitable coefficient of expansion according to the actual needs, most commonly a wax.

The thermally expansive material 5 fills the sealed cavity, i.e., also fills the second gap 14. When the wax motor works, the thermal expansion material 5 expands by heated volume, so that the pressure in the sealing cavity is increased, the first gasket 3 and the first sealing ring 4 on two sides of the second gap 14 are subjected to the pressure from the thermal expansion material 5, the first sealing ring 4, the ejector rod 2, the first gasket 3 and the shell 1 are pressed tightly, and a good sealing effect is obtained.

Preferably, in order to further improve the sealing effect, the side of the conical portion 42 facing the first gasket 3 may be inclined, and the distance between the conical portion 42 and the first gasket 3 is increased in the direction from the outside to the inside along the top-axis.

In a preferred embodiment, the high-sealing wax motor further comprises a second gasket 6, wherein the second gasket 6 is also in a circular ring shape and is installed in the installation groove and sleeved on the ejector rod 2, and the second gasket 6 is arranged on one side, far away from the first gasket 3, of the circular ring part. Different from the first gasket 3, the gap between the second gasket 6 and the ejector rod 2 is as small as possible, so long as the second gasket 6 can be conveniently disassembled and assembled with the ejector rod 2.

In a preferred embodiment, the outer circumference of the second shim 6 is dimensioned to the shape of the mounting groove such that the outer circumference of the second shim 6 abuts against the groove bottom 11 and the end face of the second shim 6 remote from the opening abuts against the outer side 12.

In some embodiments, the second pad 6 may be a copper pad as the first pad 3 to obtain good ductility; in other embodiments, the second gasket 6 may be made of other materials, such as iron, aluminum, etc.

In a preferred embodiment, the high-sealing wax motor further includes a second sealing ring 7, the second sealing ring 7 is sleeved on the top rod 2 and is arranged between the second gasket 6 and the annular portion 41, and the second sealing ring 7 is abutted to the second gasket 6 and the annular portion 41 respectively. In the preferred embodiment, the second sealing ring 7 is a fluorine rubber O-shaped ring which is high in temperature resistance, high in abrasion resistance, reliable in function, simple in installation requirement and good in dynamic and static sealing effects.

The wax motor does not require the sealing part to adopt interference fit during assembly, and is small in assembly and disassembly difficulty. When the sealing device works, the wax motor is heated, the volume of the thermal expansion material 5 in the wax motor is expanded, the first sealing ring 4 and the first gasket 3 are extruded, and gaps between the first sealing ring 4 and the ejector rod 2 and between the first gasket 3 and the shell 1 are compressed to obtain a good sealing effect. Meanwhile, the first sealing ring 4 and the first gasket 3 can be pushed towards the opening direction to extrude the second sealing ring 7 and the second gasket 6, so that the sealing effect is further improved.

The wax motor with high sealing performance provided by the invention has the advantages that the structure of the first sealing ring is improved, the conical part of the first sealing ring is inserted between the first gasket and the ejector rod and forms a second gap with the first gasket, when the wax motor works, the internal thermal expansion material is heated and expanded to form larger pressure in the sealing cavity, the first gasket and the first sealing ring on two sides of the second gap are pressurized, and the first sealing ring, the ejector rod, the first gasket and the shell are compressed tightly to obtain a good sealing effect; and when the sealing device is in a non-working state, the thermal expansion material is in a low-temperature state, the volume is small, the pressure in the sealing cavity is small or even zero, and the sealing device is convenient to disassemble and assemble.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. A high-sealing wax motor, comprising: the sealing device comprises a shell, a push rod, a first gasket, a first sealing ring and a thermal expansion material, wherein the shell is provided with a cavity with an opening at one end, and a mounting groove is formed in the side wall of the cavity along the circumferential direction; one end of the ejector rod is inserted into the cavity, and the other end of the ejector rod extends out of the opening; the first gasket is annular and is arranged in the mounting groove and sleeved on the ejector rod, and a first gap is formed between the first gasket and the ejector rod; the first sealing ring comprises a circular ring part and a conical part which are fixedly connected with each other, the first sealing ring is provided with an inner hole penetrating through the circular ring part and the conical part and is sleeved on the ejector rod through the inner hole, the circular ring part is arranged in the mounting groove and is abutted against the end face, facing the opening, of the first gasket, and the conical part is inserted into the first gap and forms a second gap with the first gasket; the shell, the first sealing ring and the ejector rod surround to form a sealing cavity, and the sealing cavity is filled with the thermal expansion material.

2. The wax motor as claimed in claim 1, wherein a side surface of the conical portion facing the first gasket is inclined, and a distance between the conical portion and the first gasket increases in an outward-inward direction of the axis of the plunger.

3. The wax motor as claimed in claim 2, further comprising a second gasket, wherein the second gasket is also annular and is mounted in the mounting groove and sleeved on the rod, and the second gasket is disposed on a side of the annular portion away from the first gasket.

4. The wax motor as claimed in claim 3, further comprising a second sealing ring sleeved on the plunger and disposed between the second gasket and the annular portion, wherein the second sealing ring abuts against the second gasket and the annular portion, respectively.

5. The high-sealability wax motor of claim 3, wherein the mounting groove has a groove bottom parallel to the inner side of the cavity, and an outer side and an inner side perpendicular to the groove bottom, the outer side being closer to the opening than the inner side.

6. The wax motor as claimed in claim 5, wherein an outer peripheral surface of the first gasket abuts against the groove bottom surface, and an end surface of the first gasket, which is away from the opening, abuts against the inner side surface.

7. The wax motor according to claim 5, wherein an outer peripheral surface of the second gasket abuts against the groove bottom surface, and an end surface of the second gasket adjacent to the opening abuts against the outer side surface.

8. The high-sealability wax motor of claim 3, wherein the first gasket and the second gasket are both copper gaskets.

9. The high-sealability wax motor of claim 1, wherein the first seal ring is a teflon seal ring.

10. The high-sealability wax motor of claim 1, wherein the thermally expandable material is wax.