Variable-structure shock absorber with Casson fluid and application of variable-structure shock absorber

Abstract

The invention discloses a variable-structure shock absorber with Casson fluid and application of the variable-structure shock absorber in the technical field of variable-damping and variable-structure shock absorbers, the variable-structure shock absorber comprises a cylinder body and a push rod with a damping head, an inner cavity of the cylinder body is filled with Casson fluid damping fluid, the push rod is provided with a driving part, the driving part is connected with the damping head, and the damping head is connected with the cylinder body. The variable structure damping head and the damping cavity are filled with the Carson fluid, so that the damper has the variable damping characteristic of the Carson fluid, the damping head structure in the damper can be changed in real time, the damping performance is improved, and meanwhile the damper has the advantages of being stable in starting, excellent in elution stage performance, simple in structure and the like; the damper is particularly suitable for a vibration reduction system of a roller washing machine, replaces an original solid friction type damper, and overcomes the defect that vibration of the system is intensified when the existing solid friction type damper is used for high-frequency dehydration.

Description

Technical Field

[0001] The present invention relates to the field of variable damping and variable structure vibration absorbers, and in particular to a variable structure vibration absorber with a Carson fluid and applications thereof. Background Art

[0002] The rapid development of the economy has led to increasing demands for quality of life, and the pursuit of a more comfortable user experience has become a necessary criterion for user selection. In the home appliance market, drum washing machines have become a necessity in people's lives due to their convenient and deep cleaning functions and relatively mature technology.

[0003] A drum washing machine generally consists of a housing and a drum (including an outer drum and an inner drum). In order to reduce the vibration generated by the rotation of the drum and maintain its stability, a solid friction vibration absorber is usually installed between the housing and the outer drum. However, solid friction vibration absorbers have certain limitations during use. When the amount of laundry is small and the rotation is high-speed, the clothes are mainly distributed in one direction, and the weight is eccentrically distributed, causing steady-state imbalance of the system. When rotating at high speed, the apparent elastic coefficient of the solid friction vibration absorber increases sharply, the displacement decreases, and the energy cannot be dissipated in time, resulting in poor vibration reduction effect. At the current stage, drum washing machines often encounter the problem of hitting the housing when starting due to the sudden acceleration of the starting force. Summary of the Invention

[0004] The object of the present invention is to provide a variable structure vibration damper with a Carson fluid and its application, which solves certain limitations of the solid friction vibration damper used in the existing drum washing machine.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: a variable structure shock absorber with Carson fluid, including a cylinder body and a push rod with a damping head, the inner cavity of the cylinder body is filled with Carson fluid damping liquid, and the push rod is provided with a driving member, which is connected to the damping head and is used to apply a force to the damping head to deform it, thereby changing the equivalent area of ​​the damping head, so that the resistance of the damping head changes when it moves in the Carson fluid damping liquid.

[0006] Preferably, the push rod includes a support rod and an insulating tube sleeved on the outer wall of the support rod, the driving member is a deformation tube sleeved on the outer wall of the insulating tube, and contact rings and wiring rings are provided at both ends of the outer wall of the support rod. The contact ring is used to electrically connect the support rod and the deformation tube, the support rod is a conductive rod, the wiring ring and the contact ring are both conductive rings, and the deformation tube is used to contract when power is turned on.

[0007] Preferably, the deformation tube is a titanium-nickel memory alloy tube.

[0008] Preferably, the damping head includes a plurality of rubber plates and a metal skeleton arranged inside the rubber plates.

[0009] Preferably, the components of the Carson fluid damping fluid include xanthan gum, guar gum and water, and also include one or more of glutaraldehyde, borax, polyethylene glycol, and sodium hydroxide.

[0010] Preferably, the viscosity of the Carson fluid damping liquid is 700,000-8,000,000 mcP at a rotation speed of 1 rpm, and the viscosity is 2,000-30,000 mcP at a rotation speed of 20 rpm.

[0011] Preferably, the Carson fluid damping liquid occupies 60-75% of the cylinder cavity volume.

[0012] Preferably, the cylinder body includes a cylinder body part and a sealing head provided on the cylinder body part.

[0013] Preferably, a second connector is provided at the end of the support rod, and a first connector is provided on the cylinder body.

[0014] Preferably, an application of the above-mentioned variable structure vibration damper in a drum washing machine is characterized in that the application specifically comprises: installing the vibration damper between the cabinet and the outer drum of the drum washing machine, and: During the start-up and washing stages of the drum washing machine, the damping head contacts the inner wall of the cylinder or maintains a gap below a set value, and at the same time, under the influence of the viscosity of the Carson fluid damping liquid, the shock absorber has an initial damping force and stiffness; During the high-frequency dehydration stage of the drum washing machine, the driving component applies force to the damping head to cause it to deform, thereby reducing the equivalent area of ​​the damping head, reducing the resistance of the damping head when it moves in the Casson fluid damping liquid. At the same time, the shear thinning characteristics of the Casson fluid damping liquid are utilized to reduce the viscosity of the Casson fluid damping liquid, thereby reducing the damping force and stiffness of the shock absorber.

[0015] The beneficial effects of the present invention are: by setting a variable structure damping head and filling the vibration damping cavity with Carson fluid, the vibration absorber not only has the variable damping characteristics of the Carson fluid, but can also change the damping head structure in the vibration absorber in real time. While improving the vibration damping performance, it also has the advantages of stable starting, excellent performance in the elution stage, and simple structure. It is particularly suitable for the vibration damping system of a drum washing machine, replacing the original solid friction damper, and overcoming the defect of the existing solid friction damper that causes aggravated system vibration during high-frequency dehydration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the three-dimensional structure of the variable structure vibration absorber of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the variable structure vibration absorber of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point B in the middle; Figure 4 For the present invention Figure 2 A magnified schematic diagram of the structure in the middle.

[0017] In the figure: 1. Cylinder body; 2. Push rod; 201. Support rod; 202. Insulation tube; 203. Deformation tube; 204. Wiring ring; 205. Contact ring; 3. First connector; 4. Second connector; 5. Damping head; 6. Sealing head. DETAILED DESCRIPTION

[0018] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] Example 1 See also Figure 1 and Figure 2 A variable structure shock absorber with Carson fluid comprises a cylinder 1, a push rod 2 is slidably inserted into the cylinder 1, and the interior of the cylinder 1 is filled with Carson fluid damping liquid; Among them, see Figure 2 and Figure 4 A damping head 5 is provided on the push rod 2, and a driving member is provided on the push rod 2. The driving member is connected to the damping head 5, and the damping head 5 is inside the Carson fluid damping liquid.

[0020] It should be noted that the driving member applies a force to the damping head 5, causing it to deform, thereby changing the equivalent area of ​​the damping head 5, so that the resistance of the damping head 5 changes when it moves in the Carson fluid damping liquid; here, the equivalent area refers to the maximum cross-sectional area of ​​the damping head 5, or the effective interception area. For example, when the equivalent area of ​​the damping head 5 is larger, the gap between the damping head 5 and the inner wall of the cylinder body 1 is smaller. At this time, the resistance of the damping head 5 to the movement in the Carson fluid damping liquid is greater, and vice versa.

[0021] It should also be noted that the driving member can be a pipe fitting, which is sleeved on the outer wall of the push rod 2. The pipe fitting is driven by a driving device (such as an electric telescopic rod) and moves on the outer wall of the push rod 2, so that the pipe fitting applies pressure to the damping head 5 to change its equivalent area; the driving member can also be the deformable tube 203 introduced below.

[0022] In this embodiment, as a further optimized solution, the components of the Carson fluid damping fluid include xanthan gum, guar gum and water, and also include one or more of glutaraldehyde, borax, polyethylene glycol, and sodium hydroxide.

[0023] It should be noted that the Carson fluid damping fluid can be made of 20% xanthan gum, 25% guar gum, 20% water, 10% glutaraldehyde, 14% borax, 10% polyethylene glycol, and 1% sodium hydroxide (each component is distributed according to the volume ratio); the Carson fluid damping fluid can also be made of 20% xanthan gum, 20% guar gum, 20% water, 10% glutaraldehyde, 20% borax, and 10% polyethylene glycol; the Carson fluid damping fluid can also be made of 15% xanthan gum, 25% guar gum, 20% water, 10% glutaraldehyde, 20% borax, and 10% polyethylene glycol.

[0024] It should also be noted that the Casson fluid damping liquid is made using a variety of solvents and solutes, and at room temperature, the viscosity of the Casson fluid damping liquid is 700,000-8,000,000 mcP at a rotation speed of 1 rpm, and the viscosity at a rotation speed of 20 rpm is 2,000-30,000 mcP.

[0025] In this embodiment, as a further optimized solution, the Carson fluid damping liquid occupies 60-75% of the inner cavity volume of the cylinder 1; the push rod 2 is driven by external force to perform reciprocating motion inside the cylinder 1, and the Carson fluid damping liquid flows in the cylinder 1 under the push of the damping head 5, generating damping force with the damping head 5 and the inner wall of the cylinder 1; the Carson fluid variable structure shock absorber is suitable for the range of -40-60℃.

[0026] In this embodiment, as a further optimization solution, please refer to Figure 4 The damping head 5 includes a plurality of rubber plates and a metal frame arranged inside the rubber plates. The plurality of rubber plates form a hollow and sealed object. The damping head 5 can maintain its shape unchanged under the resistance of the Carson fluid damping liquid, and can also realize the shape change when the push rod 2 is deformed.

[0027] In this embodiment, as a further optimization solution, please refer to Figure 1 、 Figure 2 and Figure 3 The cylinder body 1 includes a cylinder body part and a sealing head 6 provided on the cylinder body part. The sealing head 6 is sleeved on the outer wall of the push rod 2. The sealing head 6 seals the cylinder body part to prevent the Carson fluid damping liquid inside the cylinder body 1 from flowing out; a second connector 4 is provided at the end of the push rod 2 away from the cylinder body 1, and a first connector 3 is provided at the end of the cylinder body 1 away from the push rod 2; the first connector 3 and the second connector 4 are connected to the fixing part of the installation area to fix the variable structure shock absorber in the installation area.

[0028] Example 2 Taking the deformation tube 203 as an example, an implementation scheme is provided below. See also Figure 2 、 Figure 3 and Figure 4The push rod 2 includes a support rod 201 and an insulating tube 202 (such as a lubricating polymer material such as polytetrafluoroethylene) sleeved on the outer wall of the support rod 201. The driving member is a deformation tube 203 (made of a memory alloy such as titanium nickel). The deformation tube 203 is sleeved on the outer wall of the insulating tube 202. The insulating tube 202 electrically isolates the support rod 201 from the deformation tube 203. The support rod 201 is made of a material with good conductivity and high mechanical properties such as stainless steel and copper. Contact rings 205 and wiring rings 204 are provided at both ends of the outer wall of the support rod 201 (the materials of the two are The contact ring 205 is used to electrically connect the support rod 201 to the deformation tube 203, and the wiring ring 204 is connected to the control circuit. When the power is turned on, under the action of the external electric field, the deformation tube 203 will contract, which is used to pull the outer wall of the damping head 5, so that the damping head 5 extends along the length direction of the cylinder body 1, causing the damping head 5 to deform and reduce its own equivalent area (that is, reducing the contact area between the damping head 5 and the inner wall of the cylinder body 1). After the external electric field disappears, the deformation tube 203 returns to its original position, so that the pull on the damping head 5 disappears and the damping head 5 returns to its original position.

[0029] It should be noted that the end of the support rod 201 is connected to one side wall of the damping head 5, the deformation tube 203 is connected to the other side wall of the damping head 5, and the connection area between the support rod 201 and the damping head 5 is opposite to the connection area between the deformation tube 203 and the damping head 5.

[0030] Example 3 As a further optimization of Example 2, the above-mentioned variable structure vibration damper is applied to a drum washing machine to replace the original solid friction damper of the drum washing machine. The variable structure vibration damper is installed between the drum body and the outer drum of the drum washing machine. The variable damping effect is achieved by utilizing the shear thinning of the Carson fluid damping liquid and the variable structure of the push rod 2 and the damping head 5, overcoming the defect of the existing solid friction damper that causes the system vibration to increase during high-frequency dehydration; During the initial stage (just after starting) and the washing stage of the drum washing machine, the damping head 5 (the damping head 5 is not subjected to any force, and the contact area between the damping head 5 and the inner wall of the cylinder body 1 is relatively large) is in close contact with the inner wall of the cylinder body 1, achieving high resistance. Moreover, the shear stress of the filled Carson fluid damping liquid must be greater than a certain value before deformation occurs, i.e., it has an initial damping force, which overcomes the violent vibration during the initial stage. During the high-frequency dehydration stage of the drum washing machine, an external electric field is applied to reduce the effective area of ​​the damping head 5, reduce the resistance and the stiffness of the shock absorber, and improve the high-frequency vibration damping effect. The filled Carson fluid damping liquid has a shear-thinning characteristic, that is, when the same shear stress acts, the fluid viscosity decreases and the resistance decreases, thereby reducing the stiffness of the shock absorber at high frequencies and achieving effective dissipation of vibration energy.

[0031] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A variable structure shock absorber with a Carson fluid, comprising a cylinder (1) and a push rod (2) with a damping head (5), characterized in that: The inner cavity of the cylinder (1) is filled with Carson fluid damping liquid, and the push rod (2) is provided with a driving member, which is connected to the damping head (5) and is used to apply a force to the damping head (5) to deform it, thereby changing the equivalent area of ​​the damping head (5) and changing the resistance of the damping head (5) when it moves in the Carson fluid damping liquid.

2. A variable structure vibration damper with a Carson fluid according to claim 1, characterized in that: The push rod (2) comprises a support rod (201) and an insulating tube (202) sleeved on the outer wall of the support rod (201); the driving member is a deformation tube (203) sleeved on the outer wall of the insulation tube (202); a contact ring (205) and a wiring ring (204) are provided at both ends of the outer wall of the support rod (201); the contact ring (205) is used to electrically connect the support rod (201) and the deformation tube (203); the support rod (201) is a conductive rod; the wiring ring (204) and the contact ring (205) are both conductive rings; and the deformation tube (203) is used to contract when power is supplied.

3. The variable structure vibration absorber with Casson fluid according to claim 2, characterized in that: The deformation tube (203) is a titanium-nickel memory alloy tube.

4. The variable structure vibration absorber with Casson fluid according to claim 1, characterized in that: The damping head (5) comprises a plurality of rubber plates and a metal skeleton arranged inside the rubber plates.

5. The variable structure vibration absorber with Casson fluid according to claim 1, characterized in that: The components of the Carson fluid damping liquid include xanthan gum, guar gum and water, and also include one or more of glutaraldehyde, borax, polyethylene glycol and sodium hydroxide.

6. The variable structure vibration absorber with Casson fluid according to claim 5, characterized in that: The viscosity of the Carson fluid damping liquid is 700,000-8,000,000 mcP at a rotation speed of 1 rpm, and the viscosity is 2,000-30,000 mcP at a rotation speed of 20 rpm.

7. The variable structure vibration absorber with Casson fluid according to claim 1, characterized in that: The Carson fluid damping liquid occupies 60-75% of the inner cavity volume of the cylinder (1).

8. The variable structure vibration absorber with Casson fluid according to claim 1, characterized in that: The cylinder body (1) comprises a cylinder body part and a sealing head (6) provided on the cylinder body part.

9. The variable structure vibration absorber with Casson fluid according to claim 2, characterized in that: A second connector (4) is provided at the end of the support rod (201), and a first connector (3) is provided on the cylinder body (1).

10. Application of the variable structure vibration damper according to any one of claims 1 to 9 in a drum washing machine, characterized in that: The application is specifically: installing the vibration damper between the housing and the outer drum of a drum washing machine, and: During the start-up and washing stages of the drum washing machine, the damping head (5) contacts the inner wall of the cylinder (1) or maintains a gap below a set value, and at the same time, under the influence of the viscosity of the Carson fluid damping liquid, the shock absorber has an initial damping force and stiffness; During the high-frequency dehydration stage of the drum washing machine, a driving member applies a force to the damping head (5) to deform it, thereby reducing the equivalent area of ​​the damping head (5), so that the resistance of the damping head (5) when moving in the Carson fluid damping liquid is reduced. At the same time, the shear thinning characteristics of the Carson fluid damping liquid are utilized to reduce the viscosity of the Carson fluid damping liquid, thereby reducing the damping force and stiffness of the shock absorber.

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