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Research Papers: Applications

Model Study on the Oil Stiction of a Discharge Reed Valve in Compressors

[+] Author and Article Information
Fumitaka Yoshizumi

Toyota Central R&D Labs., Inc.,
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: fyoshi@mosk.tytlabs.co.jp

Yasuhiro Kondoh

Toyota Central R&D Labs., Inc.,
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: ykondoh@fldlab.tytlabs.co.jp

Takahiro Moroi

Toyota Industries Corporation,
3-217 Ebata-cho,
Obu 474-0035, Aichi, Japan
e-mail: takahiro.moroi@mail.toyota-shokki.co.jp

Shinji Tamano

Nagoya Institute of Technology,
Graduate School of Engineering,
Electrical and Mechanical Engineering,
Gokiso-cho, Showa-ku,
Nagoya 466-8555, Aichi, Japan
e-mail: tamano.shinji@nitech.ac.jp

Yohei Morinishi

Nagoya Institute of Technology,
Graduate School of Engineering,
Electrical and Mechanical Engineering,
Gokiso-cho, Showa-ku,
Nagoya 466-8555, Aichi, Japan
e-mail: morinishi.yohei@nitech.ac.jp

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 11, 2017; final manuscript received July 28, 2017; published online September 29, 2017. Assoc. Editor: Sinan Muftu.

J. Tribol 140(2), 021103 (Sep 29, 2017) (10 pages) Paper No: TRIB-17-1132; doi: 10.1115/1.4037539 History: Received April 11, 2017; Revised July 28, 2017

In a discharge reed valve for compressors, the oil stiction by the oil film between the reed and the valve seat is investigated experimentally, and a simulation model is developed. Through a model experiment, the initial oil film thickness is measured by an interferometry method, and the valve displacement and the bore pressure are measured from the stiction to the valve opening. The opening delay time together with the initial oil film thickness is measured while changing the contact area and the oil species. In the simulation model, the deformation of the reed and the pressure of the oil film as a result of cavitation are coupled. In order to take into account the tensile stress in the oil film, a cavitation model directly simulating the expansion of cavitation bubbles is developed (herein, dynamic cavitation model). In the experiment, a smaller contact area, a larger initial film thickness, and a smaller oil viscosity yield a shorter delay. In the simulation, the dynamic cavitation model is advantageous in representing the experimental delay time. In particular, with respect to the relationship between the initial film thickness and the delay time, the dynamic cavitation model with an initial bubble radius that depends on the oil film thickness yields results similar to the experimental results.

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Figures

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Fig. 1

Experimental setup and schematic diagram of optical interference

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Fig. 2

Geometry of reed valves

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Fig. 3

Examples of captured images for the initial oil film thickness, h0

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Fig. 4

Examples of interpolated h0 used in the simulation

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Fig. 5

Models of the oil film and cavitation

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Fig. 6

Mesh model and natural modes of the reed: (a) mesh model of the reed for FEM eigenvalue analysis and FVM oil film analysis and (b) natural modes and natural frequencies (ωj/(2π)) obtained by FEM eigenvalue analysis

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Fig. 7

Reed displacement on the port and bore pressure in the experiment and simulations (Seat A with PAG lubricant. The corresponding h0 distribution is shown in Fig. 3 (for the experiment) or Fig. 4 (for simulations) as “Seat A.” h0s = 3.19 μm and κb = 5.88 × 10−4 kg/s in models d-1 and d-2.)

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Fig. 8

Relationships between bubble parameters (N and κb) and the opening delay time (seat A with model d-2)

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Fig. 9

Relationships between the initial oil film thickness and the opening delay time (PAG lubricant, κb = 5.88 × 10−4 kg/s in models d-1 and d-2)

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Fig. 10

Time variation of δp and p/dt in two different initial film thicknesses (Seat A with PAG lubricant, κb = 5.88 × 10−4 kg/s in model d-2)

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Fig. 11

Distribution of the bubble radius rb by simulation (model d-2) in two different initial film thicknesses (Seat A with PAG lubricant, κb = 5.88 × 10−4 kg/s in model d-2. The corresponding time series of δp are shown in Fig. 10.)

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Fig. 12

Effect of the initial oil film thickness for a spindle oil with lower viscosity (η = 0.017 Pa·s, Seat A, κb = 0.98 × 10−4 kg/s)

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Fig. 13

Relationships between oil viscosity and opening delay time (Seat A)

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Fig. 14

Time variation of δp in two types of seats (PAG lubricant. The corresponding h0 distributions of both seats are shown in Figs. 3 and 4. h0s = 3.19 μm in seat A and h0s = 2.52 μm in seat B. Model d-2 is used in the simulation where κb = 5.88 × 10−4 kg/s. Two experimental δp are drawn with adjusting levels of the regular noise.)

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